Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1985-1989
  • 1975-1979  (2,781)
  • 1940-1944
  • 1978  (2,781)
  • Polymer and Materials Science  (2,653)
  • Ultrastructure  (128)
Source
Material
Years
  • 1985-1989
  • 1975-1979  (2,781)
  • 1940-1944
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The endocrine pancreas in chronic pancreatitis (1978)
    Springer
    Virchows Archiv 377 (1978), S. 157-174 
    Details
    ISSN: 1432-2307
    Keywords: Pancreatic diabetes ; Endocrine pancreas ; Islet composition ; Immunocytochemistry ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The endocrine pancreatic tissue from patients with severe primary chronic pancreatitis (n=6), secondary chronic pancreatitis due to duct obstruction by carcinoma (n=6) and non-diabetic, non-pancreatitic controls (n=4) was studied qualitatively and quantitatively using specific immunocytochemistry and electron microscopy. Grouping of variously sized islets in the sclerotic tissue (sclerosis islets), islet neoformation by ductuloinsular proliferation, and intrainsular fibrosis were the main qualitative findings. Immunocytochemical quantitation of the distribution of insulin (B), glucagon (A), somatostatin (D) and pancreatic polypeptide (PP) producing cells revealed a significant relative increase in the number of A cells and a decrease in the number of B cells of the sclerosis islets in primary chronic pancreatitis (B-44.1±9.3%:A-38.3±2.4%:D-8.6±5.1%:PP-4.6±4.1%) as well as in secondary chronic pancreatitis (B-38.0±14.3%:A-38.4±19.0%:D-9.1±5.8%:PP-14.5±23.4%) compared with controls (B-71.1±8.1%:A-24.3±5.5%:D-8.0±2.8%:PP-0.5±0.4%). The number of PP cells was significantly increased in primary chronic pancreatitis only. It is suggested that scarring of the exocrine pancreas affects islet composition, probably by impairment of the local circulation and of glucose diffusion, thus leading to reduction of the number and glucose sensitivity of B cells. The hyperplasia of A and PP cells appears to be a secondary phenomenon due to the loss of B cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427003
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Chemodectoma of the larynx (1978)
    Springer
    Virchows Archiv 378 (1978), S. 161-172 
    Details
    ISSN: 1432-2307
    Keywords: Chemodectoma ; Larynx ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The present case report is concerned with a clinico-pathological study, including ultrastructural investigation, of a rare and uncommon laryngeal tumour, a chemodectoma, in a 62 year old patient. There have been 23 cases of laryngeal chemodectomas reported in the literature, and only three of them, including our own report, were investigated by electron microscopy. The tumours arise from the superior and inferior laryngeal nonchromaffin paraganglia or possibly from Kultschitzky-cells of the normal bronchial mucosa. Ultrastructurally they have all the characteristics of apudomas whose parent cells (the APUD-cells), usually show endocrine function and probably have their origin in the neural crest. The tumours show an aggressive type of behaviour, despite usually benign histological features when compared to chemodectomas at other sites in the head and neck region. Surgery is thus the therapy of choice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432360
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Pinguecula et pterygion: étude histopathologique et ultrastructurale (1978)
    Springer
    Virchows Archiv 379 (1978), S. 321-333 
    Details
    ISSN: 1432-2307
    Keywords: Pinguecula ; Pterygium ; Histology ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two pingueculae combined with pterygia were studied by light and electron microscopy. Hyaline degeneration of the collagen, dark staining granular, von Kossa negative concretions and elastotic material were observed in both conditions together with marked changes in the fibroblasts, endothelial cells, pericytes and the basement membrane of conjunctival capillaries and small veins. The elastotic material is similar to that observed in solar elastosis, where the collagen fibers are less severely damaged. Chronic sun exposure of the pericorneal conjunctiva may damage endothelial cells primarily and disturb vascular exchanges. This would result in accelerated degeneration and regeneration of endothelial cells, in thickening of the basement membrane and, secondarily, disturbed metabolism of fibroblasts with alterations of the collagen and elastic fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464475
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Immunhistochemical and electron microscope analysis of adenomas of the thyroid gland (1978)
    Springer
    Virchows Archiv 380 (1978), S. 205-220 
    Details
    ISSN: 1432-2307
    Keywords: Thyroid ; Adenoma ; Ultrastructure ; Immunhistochemistry ; Thyroglobulin ; Lysosomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Histological, immunhistochemical and electronmicroscopic studies of 12 human, scintigraphically “cold”, thyroid adenomas with specific cytological differentiation identified four different cell types: oxiphil cell, clear cell, ergastoplasm-rich cell and mitochondrion-rich cell. The oxiphil tumor cell can be recognized light-microscopically by its large size and its eosinophilic granular cytoplasm. Most of these cells do not produce thyroglobulin. The ultrastructural characteristics of oxyphil cells are principally mitochondria in great numbers and many large lysosomes. Clear cell adenomas show a trabecular growth pattern. The tumor cells have an abundance of cytoplasm which contains small acidophilic granules. Immunhistochemically we were able to demonstrate thyroglobulin in small amounts within cytoplasmic granules and more extensively within the follicle lumina. Electronmicroscopically we observed a large number of smooth surfaced vacuoles of varying size, extraordinary large lysosomes and occasional cisternae of rough endoplasmic reticulum, the latter probably corresponding to the immune-histochemically identified thyroglobulin granules. The ergastoplasm-rich-cell adenomas, which to the best of our knowledge have not been previously described, show a predominantly micro-to normofollicular architecture histologically without intrafollicular colloid. The cytoplasm of the ergastoplasm-rich cells reveales a strong positive thyroglobulin-staining reaction. The fine structure of these cells is characterized by the abundance of cisternae of the rough endoplasmic reticulum. The mitochondrion-rich-cell adenomas exhibited a microfollicular structure with an intensive acidophilic granular staining at the basal part of the tumor cells. Immunhistochemically and electronmicroscopically we found some morphologic and functional features which differentiate these cells from the oxyphil cell. Thyroglobulin was located predominantly in the apical portion of the cytoplasm in the mitochondrion-rich cells without sharp demarcation from the luminar thyroglobulin. Electron microscopically fewer basal and laterally located mitochondria were seen in mitochondrion-rich cells compared with oxyphil cells. As we could not find any sign of functional activity in the oxyphilic, clear cell and ergastoplasm-rich cell adenomas we analysed those aspects of the lysosomal system not concerned with the enzymatic digestion of thyroglobulin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430459
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Über das Vorkommen sog. heller Zellen in Speicheldrüsentumoren (1978)
    Springer
    Journal of cancer research and clinical oncology 91 (1978), S. 165-182 
    Details
    ISSN: 1432-1335
    Keywords: Clear cells ; Salivary gland tumors ; Ultrastructure ; Differential diagnosis ; Helle Zellen ; Speicheldrüsentumoren ; Ultrastruktur ; Differentialdiagnose
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zu den hellzelligen Speicheldrüsentumoren gehören monomorphe hellzellige Adenome, hellzellige Carcinome, hellzellige Varianten der Acinus- und Mucoepidermoidtumoren, Talgdrüsentumoren, Speichelgang-Carcinome und pleomorphe Adenome mit hellzelligen Abschnitten. Der lichtmikroskopische, deskriptive Begriff der hellen Zelle umfaßt bei einer weiteren cytochemischen und elektronenmikroskopischen Analyse Zellformen unterschiedlicher Herkunft und funktioneller Bedeutung. Folgende Zelltypen wurden näher analysiert: indifferente Gangzellen (geringe Organellenausbildung, Desmosomen), speichernde Streifenstückzellen (Glykogengranula, zahlreiche Mitochondrien, basales Labyrinth), Myoepithelzellen (Myofilamente, Pinocytose-Vesicel, Lipofuscingranula, Hemidesmosomen), epidermoide Zellen (Tonofilamente, Desmosomen), Becherzellen (Schleimvacuolen, basales endoplasmatisches Reticulum), Talgdrüsenzellen (Lipidtropfen, Mikrovilli, Desmosomen) und helle Acinuszellen (elektronenoptisch helle Sekretgranula, kleine Mitochondrien, kleiner Golgiapparat). In die Differentialdiagnose müssen auch hellzellige Tumorformen der Speicheldrüsenregion einbezogen werden, welche primär nicht vom Speicheldrüsengewebe ausgehen. Hierzu gehören Metastasen hypernephroider Nieren-Carcinome, Paragangliome, Glomustumoren Masson, Granularzelltumoren und alveoläre Weichteilsarkome.
    Notes: Summary Clear cell tumors of the salivary glands are monomorphic clear cell adenomas, clear cell carcinomas, clear cell variants of acinic cell and mucoepidermoid tumours, sebaceous cell tumors, salivary duct carcinomas and pleomorphic adenomas with clear cell sectors. At the light microscopical level the descriptive term of the clear cell comprises cell types of different origin and functional importance which can be differentiated by cytochemistry and electron microscopy. The following cell types were analysed precisely: indifferent duct cells (small formation of organelles, desmosomes), storing striated duct cells (glycogen granules, multiple mitochondrias, basal labyrinth), myoepithelial cells (myofilaments, pinocytosis vesicles, lipofuscin granules, hemidesmosomes), goblet cells (mucous vacuoles, basal endoplasmatic reticulum), sebaceous cells (lipid droplets, microvilli, desmosomes) and clear acinic cells (electron pale secretory granules, small mitochondrias, small golgi apparatus). Clear cell tumor types of the salivary gland region which primarely do not derive from the salivary gland tissue must also be included in the differential diagnoses. These are metastases of hypernephroid renal carcinomas, paragangliomas, glomus tumors of Masson, granular cell tumor and alveolar soft-part sarcomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00284023
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Malignant giant cell tumor of bone (1978)
    Springer
    Virchows Archiv 379 (1978), S. 185-201 
    Details
    ISSN: 1432-2307
    Keywords: Giant cell tumor ; Ultrastructure ; Acid phosphatase ; Lysosomes ; Bone tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The fine structure of the different cell types constituting a primary malignant giant cell tumor of bone has been studied and the localization of acid phosphatase in relation to the subcellular organelles been demonstrated. Three distinct cell types with characteristic ultrastructural features were observed: giant cells, fibroblast-like cells, and cells with abundant lipid inclusions and mitochondria. Certain differences were noted between these three cell types and their counterparts in benign giant cell tumors of bone (described in a separate report). The enzyme histochemical and morphological data suggested that the giant cells in the malignant tumor might possess a more active and expansive lysosomal apparatus than corresponding cells in the benign variant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432635
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    An ultrastructural study of the placenta in materno-fetal rhesus incompatibility (1978)
    Springer
    Virchows Archiv 379 (1978), S. 229-241 
    Details
    ISSN: 1432-2307
    Keywords: Placenta ; Ultrastructure ; Rhesus incompatibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An electronoptical study has been made of eleven placentae from cases of materno-fetal rhesus incompatibility. The characteristic findings are focal, but sometimes quite extensive, syncytial necrosis, retention of normal pinocytotic and secretory activity in the non-necrotic syncytiotrophoblast, cytotrophoblastic hyperplasia, thickening of the trophoblastic basement membrane, immature-type endothelial cells in the fetal villous vessels and thickening or lamination of the capillary basement membranes. The pathogenesis of many of these changes is not clear but there is no evidence that they are immunologically mediated. It is suggested that the syncytial necrosis may be due to narrowing of the intervillous space as a result of increased villous size, that the cytotrophoblastic hyperplasia is a response to the syncytial damage and is responsible for the changes in the trophoblastic basement membrane and that the fetal capillary changes are indicative of endothelial cell damage due, possibly, to fetal anaemia. Despite the damage suffered by the placenta in materno-fetal rhesus incompatibility there is little evidence of impaired functional efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432638
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Ultrastructure and morphometry of ACTH-producing cell in the rat anterior pituitary gland stimulated by lysin-vasopressin and prostaglandin E1 (1978)
    Springer
    Virchows Archiv 378 (1978), S. 23-33 
    Details
    ISSN: 1432-2307
    Keywords: Pitutary ; Ultrastructure ; Vasopressin ; Prostaglandin ; Morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ziel dieser Untersuchung war es, quantitative and qualitative Änderungen der ACTH-Zelle in der Rattenhypophyse nach Gabe eines spezifischen und eines unspezifischen Stimulus zu untersuchen. Es wurden ein CRF-Analogon (Lysin-Vasopressin) und ein Prostaglandin (Prostaglandin E1) benutzt. Jeweils 20 Ratten wurden für 4 Wochen Lysin-Vasopressin oder Prostaglandin E1 intraperitoneal injiziert. Die Hypophysen wurden licht- und elektronenoptisch sowie morphometrisch untersucht. Nach Gabe beider Stoffe konnte man eine Aktivierung der ACTH-Zellen beobachten. Die Vergrö\erung des Kerns, des Cytoplasmas und der an der Hormonherstellung beteiligten Zellorganellen lie\ sich morphometrisch nachweisen, wobei die Wirkung von Lysin-Vasopressin ausgeprÄgter war als die des Prostaglandins. Darüber hinaus konnte eine Zunahme der ACTH-Zellzahl gefunden und mit einem statistischen Test als signifikant nachgewiesen werden. Im Gegensatz zu Lysin-Vasopressin erstreckte sich die Wirkung des Prostaglandins auch auf andere Hypophysenzellen.
    Notes: Summary The aim of this study was to investigate the qualitative and quantitative changes of ACTH-cells in the rat after application of a specific and a non-specific stimulus. A CRF-analog (lysin-vasopressin) and a prostaglandin (prostaglandin E1) were used. 40 rats were injected lysin-vasopressin or prostaglandin E1, respectively, for 4 weeks. The pituitary glands were investigated by means of light microscopy, electron microscopy and morphometry. Activation of the ACTH-cells could be observed after use of both substances, the effect of lysin-vasopressin being more intense than that of prostaglandin E1. Enlargement of the nucleus, the cytoplasm and the organelles involved in hormone-production and -transport were found and verified by morphometry. Additionally an increase in number of the cells could be demonstrated. Prostaglandin influenced not only ACTH-cells, but also other cells of the anterior pituitary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427183
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Giant cell tumor of bone (1978)
    Springer
    Virchows Archiv 378 (1978), S. 287-295 
    Details
    ISSN: 1432-2307
    Keywords: Giant cell tumor ; Ultrastructure ; Alkaline phosphatase ; Human bone neoplasias
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The fine structural localization of nonspecific alkaline phosphatase was elucidated in two giant cell tumors of bone using lead as capturing ion and Β-glycerophosphate as substrate in the incubation solution. Lead phosphate precipitate — indicating presence of alkaline phosphatase — was demonstrated on the plasma membranes, and the membranes bordering vesicles and vacuoles of presumed endocytotic nature, in giant cells and type 1 stromal cells (fibroblast-like cells). The findings support the view that stromal cells type I and giant cells are histogenetically related.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00465595
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The ultrastructure of bone cells and bone matrix in human primary hyperparathyroidism (1978)
    Springer
    Virchows Archiv 379 (1978), S. 11-23 
    Details
    ISSN: 1432-2307
    Keywords: Primary hyperparathyroidism ; Bone cells ; Bone matrix ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An electron microscope investigation has been carried out on needle biopsies of the iliac crest of 8 patients suffering from primary hyperparathyroidism. A marked increase in bone resorption was the most conspicuous finding. It was due both to increased osteoclastic activity and to periosteocytic osteolysis. The osteoclasts had a more strongly developed brush border and contained more cytoplasmic vacuoles than those in controls. Many osteocytes were found within enlarged, irregular lacunae, and were surrounded by a space containing amorphous, granular and filamentous material. Their mitochondria were sometimes calcified. Osteoblasts were more active than in controls as shown by the developed rough ergastoplasmic cysternae and thick osteoid borders found near some of them. The osteoid tissue, however, was uncalcified; ultrastructurally, lack of the calcification front and incomplete matrix calcification were demonstrable. Mast cells, and osteoclast- and macrophage-like giant cells were often found in the fibrotic marrow spaces. These results confirm that both the resorption and the formation of bone are stimulated in hyperparathyroidism. The calcification process is delayed and often remains incomplete.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432779
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    Kleinhirnastrocytome und Opticusgliome — eine vergleichende feinstrukturelle Untersuchung (1978)
    Springer
    Virchows Archiv 380 (1978), S. 59-79 
    Details
    ISSN: 1432-2307
    Keywords: Cerebellar astrocytoma ; Optic glioma ; Pilocytic astrocytoma ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An ultrastructural comparison of 8 cerebellar astrocytomas and 4 optic gliomas shows that the morphological patterns of both tumor-groups are identical. The confusion in nomenclature of these tumors is discussed and reasons for a preference for the term “pilocytic astrocytomas” are given. Further, pilocytic astrocytes seem to be a special, phylogenetically older, group of glial cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432893
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Ultrastructure, histology, and innervation of the mantle edge of the freshwater pulmonate snailsLymnaea stagnalis andBiomphalaria pfeifferi (1978)
    Springer
    Calcified tissue international 26 (1978), S. 271-282 
    Details
    ISSN: 1432-0827
    Keywords: Shell formation ; Free nerve endings ; Ultrastructure ; Lymnaea stagnalis ; Biomphalaria pfeifferi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The mantle edge of the freshwater pulmonate snailsLymnaea stagnalis andBiomphalaria pfeifferi was investigated with histochemical and ultrastructural methods. The mantle edge gland, which is involved in shell formation, consists of the periostracal groove and the belt. This belt appears to be composed of various regions. In the area of the periostracal groove a number of subepithelial gland cell types occur; these release their products into the groove. Between the groove cells ciliated free nerve endings terminate; the corresponding perikarya occur in the subepidermal connective tissue. Also in the posterior belt region free nerve endings were observed between the epithelial cells; in addition, a particular type of subepithelial gland cell was found in this area. The epithelial cells of this part of the belt have the ultrastructural characteristics of ion and water transporting cells; they are probably involved in calcium deposition and resorption. The possible role of the free nerve endings and of the subepithelial gland cells is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02013270
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Whole-body retention of mercury and selenium and histopathological and morphological studies of kidneys and liver of rats exposed repeatedly to mercuric chloride and sodium selenite (1978)
    Springer
    Archives of toxicology 40 (1978), S. 189-199 
    Details
    ISSN: 1432-0738
    Keywords: Mercury ; Selenium ; Retention ; Liver ; Kidney ; Ultrastructure ; Interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Distribution and retention of mercury and selenium was studied in rats exposed repeatedly to HgCl2 injections (0.5 mg Hg/kg to the tail vein every other day) and intragastrically to Na2SeO3 (0.5 mg Se/kg every day), applying combined and separate administration of these metals for 2 weeks. Whole-body retention of mercury in the presence of selenium was augmented by 20% and that of selenium in the presence of mercury by 4% with respect to the administered dose. Combined administration of mercuric chloride and sodium selenite brought about damage to the epithelial cells of renal proximal convolutions and formation of protein casts in their lumen. These changes had the same pattern as those induced by administration of mercuric chloride alone, but the intensity was lower. Submicroscopic studies revealed that repeated combined administration of sodium selenite and mercuric chloride did not completely abolish the mercury-induced mitochondrial swelling and contributed to chromatin destruction in the hepatocyte nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364650
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Vergleichende Untersuchungen bei juvenilem und adultem Colloid Milium (1978)
    Springer
    Archives of dermatological research 261 (1978), S. 231-244 
    Details
    ISSN: 1432-069X
    Keywords: Colloid Milium ; Different types ; Histopathology ; Ultrastructure ; Colloid Milium ; Verschiedene Typen ; Histopathologie ; Ultrastruktur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Unterschiede im Verlauf und Erbmuster des Colloid Milium deuten an, daß zwischen dem juvenilen und adulten Typ dieser Dermatose wesentliche Unterschiede bestehen. Ziel der vorliegenden Untersuchungen war, mit Hilfe von Licht-, Immunfluorescenz- und elektronenoptischen Methoden nach Unterschieden im mikroskopischen Bereich anhand je eines Falles zu suchen. Folgende Befunde wurden erhoben: Beim juvenilen Colloid Milium sind die Kolloidmassen nicht nur direkt unter dem Epithel abgelagert, sondern auch innerhalb der Epidermis häufig zu finden. Sie zeigen nach Kongorotfärbung einen Dichroismus und können Immunglobuline, Komplement und Fibrin enthalten. Elektronenmikroskopisch zeigt sich, daß sie aus dicht gepackten wellig verlaufenden Fibrillen bestehen, deren individueller Durchmesser etwa 80 Å beträgt. Innerhalb dieser fibrillären Massen sind häufig Melanosomen, Reste von Kernen und anderen Zellorganellen sowie Desmosomen nachweisbar. Beim adulten Colloid Milium sind die Kolloidmassen meist von der Epidermis durch einen Elastika-positiven Bindegewebsstreifen getrennt. Mit Kongorot sind sie nur schwach darstellbar und zeigen keinen Dichroismus. Fluorescenzoptisch zeigen sie eine bläuliche Autofluorescenz, aber keine spezifischen Ablagerungen. Elektronenmikroskopisch kann das adulte Kolloid als feingranuläres Material mit wenigen feinsten Mikrofibrillen charakterisiert werden, das in enger Nachbarschaft von Gefäßen mit verdichteter Basalmembran und von aktiven Fibroblasten gelegen ist. Auf Grund dieser Unterschiede können der juvenile und adulte Typ des Colloid Miliums klar auch mikroskopisch voneinander differenziert werden. Die Ergebnisse deuten darauf hin, daß beim juvenilen Typ vorwiegend epidermale Läsionen, beim adulten jedoch dermale Störungen eine wesentliche Rolle in der Pathogenese spielen.
    Notes: Summary Two different types of colloid milium are characterized on the basis of clinical and genetical parameters. In order to establish morphological criteria allowing a differentiation also at microscopic levels comparative histopathological, histo- and immunochemical as well as ultrastructural investigations were performed in a case of juvenile and a case of adult colloid milium. The following results were obtained: In juvenile colloid milium the colloid material is deposed in direct apposition to the basal epidermal layers and can be found also in suprabasal position within the epidermis. No actinic elastosis is present in the periphery of the deposits but they exhibit a green birefringency by investigation of Congo-red stained frozen sections in polarized light. Immunoglobulins, complement and fibrin can be demonstrated within the deposits by direct immunofluorescence. Electron microscopy reveales a fibrillar ultrastructure of the colloid masses, which contain numerous melanin granules and desmosomes. Therefore the colloid material in the juvenile type is most likely of epidermal origin. In adult colloid milium the colloid is usually separated from the epidermis by a band of connective tissue elements containing a considerable amount of elastin. The surrounding superficial dermis frequently exhibits elastotic changes. Congo-red reaction is only weakly positive and no dichroisms can be found. Direct immunofluorescence reveals no specific staining, but a blue autofluorescence of the material. Ultrastructurally, the adult colloid represents mainly finely granular material, with only few microfilaments. The masses are situated in the dermis, often near duplicated vascular basement membranes and in close apposition to active fibroblasts. Thus, the colloid material seems to be of dermal origin. The microscopic findings strongly indicate, that the two different types of colloid milium indeed represent different entities, discernable not only by clinical or genetic but also by histomorphologic parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455291
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Action of the “nude” gene on pigmentation of the coat in C57 black and C3H mice (1978)
    Springer
    Archives of dermatological research 262 (1978), S. 219-227 
    Details
    ISSN: 1432-069X
    Keywords: Nude mice ; Skin pigmentation ; Ultrastructure ; Tyrosinase activity ; Hair cycle ; Nackte Mäuse ; Hautpigmentierung ; Ultrastruktur ; Tyrosinaseaktivität ; Haarcyclus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Autoren untersuchten die Pigmentveränderungen an Haut und Haar an pigmentierten nackten Mäusen. Histologische und elektronenmikroskopische Untersuchungen und die Polyacrylamid-Elektrophorese der Tyrosinaseaktivitäten zeigten vom morphologischen und biochemischen, daß die Veränderungen der Programmierung solcher “nude” Mäuse auf den Haarcyclus und auf das Haarwachstum bezogen werden kann. In der Tat entwickeln sich die Haarfollikel cyclisch wie die der Mäuse mit normaler Haut. In depigmentierter Haut waren die Haare in der Ruhepause und es konnte keine lösliche Tyrosinase aufgefunden werden.
    Notes: Summary The authors have studied pigmentary changes of skin and hair due to the presence of the “nude” gene in pigmented species (C 57 Bl. 6J, C 3H). Morphological (histology, electron microscopy) and biochemical (polyacrylamide gel electrophoresis of tyrosinase activities) studies showed that the pigmentary alterations of the “nude” mice were related to the hair cycle and hair growth wave pattern. In fact, in the “nude” mice the hair follicles evolves cyclically similarly to mice of normal coat. In depigmented skin, the hair follicles were in the resting phase and no soluble tyrosinase could be demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455393
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Untersuchung am cutanen Leiomyosarkom (1978)
    Springer
    Archives of dermatological research 263 (1978), S. 159-169 
    Details
    ISSN: 1432-069X
    Keywords: Leiomyosarcoma of the skin ; Ultrastructure ; Cellular differentiation ; Accumulation of centrioles ; Cutanes Leiomyosarkom ; Ultrastruktur ; celluläre Differenzierung ; multiple Centriolen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine 61jährige Patientin hatte sich vor 15 Jahren einen Tumor vom linken Unterschenkel entfernen lassen. Im Bereich der Narbe kam es zu erneuter Tumorbildung. Die histologische Untersuchung zeigte einen aus meist spindeligen Zellen zusammengesetzten Tumor mit vielen Mitosen und Kernpolymorphie. Die Diagnose eines cutanen Leiomyosarkoms wurde durch den elektronenmikroskopischen Nachweis der für glatte Muskelzellen charakteristischen Zellelemente gesichert. Der Differenzierungsgrad der Tumorzellen variierte zwischen relativ differenzierten, filamentreichen Zellen, die noch an normale glatte Muskelzellen erinnerten, und ödematösen, filamentarmen, aber organellenreichen entdifferenzierten Zellen. Eine auffallende morphologische Besonderheit war der wiederholte Nachweis von zahlreichen akkumulierten Centriolen.
    Notes: Summary A 61-year old woman developed a tumourous nodule in her left leg. Fifteen years ago a similar tumour had been removed in the same localization. Histological examination performed on biopsy material showed bundles of predominantly fusiform tumour cells with nuclear pleomorphism and many mitotic figures. Electron microscopic examination confirmed the diagnosis of leiomyosarcoma by demonstration of the ultrastructural characteristics of smooth muscle cells. Cellular differentiation showed various degree ranging from smooth muscle cell type to dedifferentiated edematous tumour cells with scanty myofilaments. An important finding was the demonstration of multiple accumulated centrioles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446437
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Ultrastructural detection of Haemophilus ducreyi in biopsies of chancroid (1978)
    Springer
    Archives of dermatological research 263 (1978), S. 153-157 
    Details
    ISSN: 1432-069X
    Keywords: Chancroids ; Biopsies ; Haemophilus ducreyi ; Ultrastructure ; Ulcera mollia ; Biopsien ; Haemophilus ducreyi ; Ultrastruktur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Anläßlich einer lokalen Häufung von insgesamt 26 Ulcus molle-Fällen in Berlin (West) wurden in Biopsien coccoide Stäbchen durch ultrastrukturelle Untersuchung entdeckt. Ihre Zellwand ist ca. 120 Å dick und trilaminar entsprechend Gram-negativen Bakterien. Die Bakterien sind hinsichtlich der Zellwandstruktur sowie der Cytoplasmazusammensetzung identisch mit Haemophilus ducreyi, die kulturell von typischen Ulcera mollia gezüchtet, intermittierend mikroskopisch auf Reinheit geprüft, in tierisches Material geimpft und anschließend ultrastrukturell untersucht wurden. In menschlichem ulcerösen Gewebe finden sich die Bakterien überwiegend im Extracellulärraum und in Gruppen gelagert.
    Notes: Summary During an endemic appearance of chancroids (26 cases) in Berlin (West) coccobacilli were disclosed in biopsies by electron microscopy. The bacteria were aggregated predominantly in groups in the extracellular space. Their cell wall is approximately 120 Å thick and trilaminar as in Gram-negative bacteria. Concerning the cell wall structure and the cytoplasmic composition, the detected coccobacilli are identical to culturally grown Haemophilus ducreyi obtained from chancroids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446436
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Studies on the liver of Xenopus laevis (1978)
    Springer
    Anatomy and embryology 154 (1978), S. 1-25 
    Details
    ISSN: 1432-0568
    Keywords: Bile canaliculus ; Development ; Glycogenesis ; Hepatocytes ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The ultrastructural changes during development and metamorphosis in the liver ofXenopus laevis have been investigated. In this species it was found that developmental processes, which ultimately lead to the formation of bile canaliculi, can be detected in the liver anlage as early as stage 35. While the wall of the primary liver cavity is thrown into folds which form the liver parenchyma, the bile canaliculi are formed (st. 36–38). Secretion into the lumen of the bile canaliculi was not found to occur before stage 47 and IDP-ase activity could not be detected in the bile canaliculi before stage 49. The intra- and extrahepatic portions of the hepatic duct system were found to be formed during the stages 40–41. The formation of the duct system involves cellular degeneration in the lumen of the future ducts. These processes are described in detail. The glycogen content of the developing hepatocytes received particular attention during the course of this study. It was found that after depletion of the embryonal glycogen the hepatocytes are completely free from glycogen during the stages 43–45. At stage 46, after the begin of feeding, beta as well as alpha particles of glycogen appear in the hepatocytes. These first reappearing glycogen particles are formed without the participation of SER membranes, in areas which are loaded with RNA particles. It was found that only after the synthesis of glycogen had been initiated SER membranes started to proliferate in the hepatocytes, where they were mostly found intermingled with glycogen particles. From stage 54 on, where the liver glycogen content was found to be 0.2%, the glycogen content of the liver almost continuously increased until it reached a temporary peak of 10% at the end of metamorphosis. These findings strongly contrast results reported for other amphibia, which at the end of metamorphosis have depleted their glycogen content completely. Details of the ultrastructural changes occuring during development of the hepatocytes, are also reported in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317951
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    The ependymal and glial configuration in the spinal cord of urodeles (1978)
    Springer
    Anatomy and embryology 154 (1978), S. 67-82 
    Details
    ISSN: 1432-0568
    Keywords: Urodeles ; Spinal cord ; Ependyma ; Glia ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The structural organization of the ependymal and macroglial components of the central field of the spinal cord of postmetamorphic ribbed newts has been reinvestigated using elaborate fixation procedures for transmission electron microscopy. All along the central canal, the ependymal cells display ultrastructural features that strongly suggest a secretory activity. Infrequent mitotic images, occurring spontaneously among the ependymal cells, were observed. The tightly compacted periependymal stratum contains two types of glial cells: 1. oligodendrocytes, also observed outside this stratum as neuronal satellites, and 2. radial astrocytic cells, whose somata, exclusively located in the periependymal stratum, send their processes to the subpial lamina. The intercellular relationships between ependyma, oligodendrocytes and astrocytic cells are illustrated to show the continuity of the neuroepithelial configuration. Morphologic clues for identifying the cells of the central field of the urodele spinal cord are given. A gradient of differentiation of the oligodendroglial components could be postulated. In normal conditions, the astroglial differentiation is permanently arrested at the stage of radial glia. Some considerations concerning regeneration in the urodele spinal cord are submitted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317955
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Ultrastructural study of the adenohypophysis of the male Chinese quail (1978)
    Springer
    Anatomy and embryology 154 (1978), S. 185-211 
    Details
    ISSN: 1432-0568
    Keywords: Adenohypophysis ; Cellular types ; Ultrastructure ; Birds ; Excalfactoria chinensis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The ultrastructural analysis of the adenohypophysis in the male Chinese quail reveals seven different types of granular cells, and agranular folliculo-stellate cells. The cell types are assumed to be endocrine cells and are classified as: Type I cells (presumptive LH-gonadotrophs), with dilated endoplasmic reticulum, perinuclear spaces, and granules of 150–260 nm; Type II cells (presumptive FSH-gonadotrophs), with regularly-shaped cytoplasmic cisterns and small granules (80–150 nm); Type III cells (presumptive thyrotrophs), very close in appearance to the type II cells of normal birds; Type IV cells (presumptive prolactin cells), with very large secretory granules (up to 400 nm), Type V cells (presumptive corticotrophs), with abundant and electrondense granules (160–300 nm); Type VI cells, with irregularly-shaped granules; Type VII cells (presumptive somatotrophs), with abundant granules (130–220 nm) and less cytoplasmic structures. Cytological characteristics of the nucleus, and more particularly the presence of a Feulgen-positive nucleolus with a very particular ultrastructure are here reported. It is proposed that heterospecific associations of Chinese quail cells with chick cells can be used in embryological work for the study of cellular interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304662
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    The effects of cytochalasin B and colchicine on cell motility and ultrastructure in primary cultures of malignant gliomas (1978)
    Springer
    Acta neuropathologica 44 (1978), S. 21-30 
    Details
    ISSN: 1432-0533
    Keywords: Tissue cultures ; Cytochalasin B and colchicine ; Cell motility ; Ultrastructure ; Glioma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Primary tissue cultures of human gliomas were treated with cytochalasin B (0.5–60 μg/ml for 90 min). Cell motility was inhibited irreversibly in glial tumour cells, but the effect was reversible on the mesenchymal cells growing in culture in the lower dose range. Cell adhesion was considerably reduced as the dose was increased, as was the capacity for cells to spread on a surface from suspension. Low concentrations of cytochalasin B caused negligible cell death and little disruption of cell ultrastructure. However, increases in dose were accompanied by a greater predominance of rough endoplasmic reticulum and inclusions and aggregation of microfilament bundles. As seen by scanning electron microscopy, cytochalasin B caused the withdrawal of peripheral cell borders, disappearance of ruffles and the breakdown of cytoplasmic lamellae. Charateristic surface blebs and folds appeared in their place. By comparison, colchicine (1–10 μg/ml) caused a less marked and non-specific reversible reduction in cell motility on both glial and mesenchymal cells. No significant change in cell adhesion or spreading took place even at high doses, although at all concentrations gross disruption of the cell surface took place with changes in ultrastructure characterised by loss of cytoplasmic microtubules and aggregation of 10 nm filaments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691635
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    Retention of the differentiated state by larvalXenopus liver cells in primary culture (1978)
    Springer
    Development genes and evolution 185 (1978), S. 235-248 
    Details
    ISSN: 1432-041X
    Keywords: Liver ; Primary culture ; Ultrastructure ; Albumin synthesis ; Xenopus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Electron microscopic analysis of primary cultures derived from larvalXenopus liver has shown that these cells, although they form only two-dimensional aggregates, retain and presumably also develop structural characteristics typical of liver parenchyma cells, such as bile canaliculi with microvilli and epithelial junctional complexes. As judged from structural criteria, primary cultures contain 80–90% hepatocytes. In contrast to the intact tissue, primary cultures showed excessive development of microfilaments, however. Incorporation of labeled amino acids has revealed further that the capacity for protein synthesis is maintained in culture and that synthesis of liverspecific protein albumin is maintained in vitro, even in liver cultures derived from thyrostatic tadpoles. This latter result suggests that initiation of albumin synthesis in the larval liver is probably not dependent upon thyroid hormones but rather reflects the protodifferentiated state of this tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848354
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Coquille de l'oeuf de caille: Étude ultrastructurale et cristallographique (1978)
    Springer
    Calcified tissue international 25 (1978), S. 145-159 
    Details
    ISSN: 1432-0827
    Keywords: Bird egg shell ; Ultrastructure ; Calcification ; Electron diffraction ; Microanalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The egg-shell of Japanese quail was studied by several techniques. Semithin sections (1μm thick) of non-decalcified shell were observed by normal and polarized light microscopy. Thin sections of non-decalcified shell, examined by transmission electron microscopy, permitted us to observe the forms and dimensions of crystals of calcite within different layers of the shell: mammilary layer, layer of cones, palissade layer and surface crystal layer. There appears to be two distinct zones in the layer of cones as well as in the superficial crystal layer. Electron microdiffraction revealed the orientation of calcite crystals in the columns. Some crystal defects (twins?) were described and the possibility of their artefactual formation during ultramicrotomy is discussed. Localization of Ca, Mg, P and S were made by X-ray microanalysis of semithin sections. This technique shows that shell membranes, and chiefly the true cuticle, are also mineralized but, in these layers, minerals are not crystallized. Otherwise the distribution of Mg is not uniform throughout the shell thickness; it is less concentrated in the external zone of the layer of cones. These results together with observation of developing shells by scanning electron microscopy allowed us to propose a scheme for shell organization of the quail egg. This organization was related with decalcification which occurs during hatching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010763
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    Pseudolymphoma of skin induced by oriental hornet (Vespa orientalis) venom (1978)
    Springer
    Archives of dermatological research 262 (1978), S. 135-141 
    Details
    ISSN: 1432-069X
    Keywords: Pseudolymphoma ; Oriental hornet venom ; Ultrastructure ; Pseudolymphoma ; Orientalische Wespe ; Ultrastruktur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Eine einmalige sucutane Injektion des Giftes der orientalischen Wespe führt bei schwarzen Mäusen zu der Entwicklung eines subcutanen Knötchens, welches sich über 1 Jahr hält. Ultrastrukturell zeigt sich eine Anreicherung von Lymphocyten und Lymphoblasten und einige Plasmazellen mit Russelkörperchen. Zusätzlich werden einige Melanin enthaltende Makrophagen und auch solche mit aufgenommenen cellulären Abbauprodukten beobachtet. Die gesamte Reaktion wird mit anderen pseudolymphomatösen Reaktionen in der Haut in Beziehung gesetzt.
    Notes: Summary A single subcutaneous injection of Oriental hornet venom into black mice led to the development of a subcutaneous nodule which showed no change during the period of 1 year. Study of the ultrastructure revealed an accumulation of lymphocytes and lymphoblasts and a few plasma cells with formation of Russel bodies. In addition, a few melanin-containing macrophages and macrophages filled with cellular debris were found. This reaction is compared to other pseudolymphomatous reactions in the dermis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455382
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    Disappearence of the intracytoplasmic membranes inRhodopseudomonas sphaeroides (1978)
    Springer
    Archives of microbiology 117 (1978), S. 293-295 
    Details
    ISSN: 1432-072X
    Keywords: Rhodopseudomonas sphaeroides ; Intracytoplasmic membranes ; Membranes ; Ultrastructure ; Bacteriochlorophyll ; Chromatophores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The photosynthetic bacterium,Rhodopseudomonas sphaeroides, can be grown phototrophically (light, anaerobiosis), of chemotrophically (dark, aerobiosis). In the first case, it contains intracytoplasmic membranes with photosynthetic pigments. When shifted from phototrophy to chemotrophy these membranes disappear in an unknown fashion. In the present experiment, samples were taken for electron microscopy, cell density and bacteriochlorophyll determinations after shift from phototrophy to chemotrophy. The density of intracytoplasmic vesicles was measured on micrographs. During the first 2h growth is very slow and the ultrastructure remains unaltered. As growth resumes, the vesicles disappear at a rate which implies that they are not incorportated into the cytoplasmic membrane, nor actively digested, but remain intact and become increasingly diluted in the cytoplasm as the culture grows. The size of the vesicles was estimated to about 500 Å. The number of vesicles in phototrophically grown cells was calculated to about 575 per cell, and after 6h chemotrophic growth to about 100. The areas of the cytoplasmic and intracytoplasmic membranes are roughly calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00738549
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    Sporogenesis in Streptomyces melanochromogenes (1978)
    Springer
    Archives of microbiology 118 (1978), S. 309-316 
    Details
    ISSN: 1432-072X
    Keywords: Streptomyces melanochromogenes ; Sporogenesis ; Formation of sporulation septum ; Delimitation, separation, and release of spores ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mode of spore differentiation in a strain of Streptomyces melanochromogenes was followed by analysis of ultrathin sections of sporulating aerial hyphae at various stages of sporogenesis. A special accent was laid on the formation of the sporulation septum and its alterations in the course of spore delimitation and separation. Distinct differences in formation and substructure have been observed between the cross walls of vegetative hyphae and the sporulation septa. Cross walls of vegetative hyphae are formed in a way typical for Gram-positive bacteria by a centripetal annular ingrowth of cytoplasmic membrane, on which wall material immediately is deposited. The development of the sporulation septa is characterized by the accumulation of amorphous material in addition to the newly synthesized wall layer inside the invaginating cytoplasmic membrane. This amorphous septal material will later be decomposed presumably by two lytic systems which cause the separation of the spores. The central region of the finished sporulation septum is perforated by microplasmodesmata. Spores are released by a break down of the surface sheath. The complete spores are enveloped by a twolayered cell wall and the spiny surface sheath.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429123
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    Ultrastructural studies on hydantoin induced lymphomas in mice (1978)
    Springer
    Journal of cancer research and clinical oncology 91 (1978), S. 195-204 
    Details
    ISSN: 1432-1335
    Keywords: Hydantoin ; Malignant Lymphoma ; Mice ; Ultrastructure ; Hydantoin ; Maligne Lymphome ; Maus ; Ultrastruktur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ultrastrukturelle Zellveränderungen werden beschrieben am Original-Tumorgewebe und an Tumorzellen aus der Kurzzeitkultur von malignen Lymphomen, induziert durch chronische Diphenylhydantoin-Exposition. Diese Tumoren entstanden in Mäuse-Inzuchtlinien mit niedriger (C57Bl) und hoher (SJL/J) spontaner Lymphomrate im fortgeschrittenen Alter, waren jedoch nicht induzierbar in einer Lymphom-resistenten Linie (C3Hf). Frühveränderungen des lymphoretikulären Gewebes bestanden in einer zunehmenden Atrophie des Thymus und der thymusabhängigen Partien, begleitet von einer diffusen retikulo-histiozytären Hyperplasie. Lymphome vom lymphoblastischen Typ entstanden im Thymus nach einer Latenzzeit von 4–8 Monaten mit nachfolgender Generalisation. Verschiedene atypische Veränderungen wurden an Tumorzellen beobachtet sowie das Auftreten von C-Typ-Partikeln in den Tumorzellkulturen und hinsichtlich der Pathogenese der Lymphome diskutiert.
    Notes: Summary Ultrastructural studies were done on cells from original tumors and from short time cultures of mouse thymic lymphomas experimentally induced by chronic exposure to diphenyl-hydantoin. The tumors appeared in mouse strains with low (C57Bl) and high (SJL/J) susceptibility to spontaneous lymphoma development and were not observed in a resistant strain (C3Hf). Thymic lymphoma development was usually preceded by increasing lymphoreticular atrophy followed by progressive reticulohistiocytic hyperplasia, and subsequently spread to other tissues. Morphologically the tumor was characterized as a lymphoblastic lymphoma. Abnormal cell changes in the original tumors and cultured cells, and the presence of murine C-type particles in the cultured cells but not in the original tumors, are discused in relation with the disturbance of immune system and the lymphoma enhancement produced by diphenyl-hydantoin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00284026
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    Ultrastructural study of microcyclic macroconidiation in Neurospora crassa (1978)
    Springer
    Archives of microbiology 116 (1978), S. 279-288 
    Details
    ISSN: 1432-072X
    Keywords: Neurospora crassa ; Macroconidia ; Microcycle ; Heat ; Ultrastructure ; Nucleolus ; Proconidia ; Septa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Heat-shock of macroconidia of Neurospora crassa at 46°C followed by shift-down to 25°C determines premature conidiogenesis. The nuclei and cytoplasm of heat-treated, swollen conidia contain spots of a dense material especially concentrated around the nucleolus in short time treated ones. In the first proconidium apically budding on the enlarged tip of the premature conidiophore, small vesicles are peripherally spread. A few such vesicles are later seen lining the initially simple septum separating the proconidial units into conidia. The doubling of this interconidial septum is surface viewn as a thick annulus. Disarticulation of the conidial units intervenes along a septal furrow of electroluscent material. Interconidial continuity through the septal pores is transiently insured by a connective which is ruptured for final liberation of the conidia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417852
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    The ultrastructure of mycobacterium marinum granuloma in man (1978)
    Springer
    Archives of dermatological research 262 (1978), S. 205-217 
    Details
    ISSN: 1432-069X
    Keywords: Mycobacterium marinum ; Ultrastructure ; High-turnover granuloma ; Immunogenic orgin ; Intracellular collagen precursor ; Mycobaterium marinum ; Ultrastruktur ; High-turnover Granulom ; Immunogenes Granulom ; Intracelluläre Kollagenpräcursoren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Drei Knoten (klinisches Alter 3–5 Wochen) von 2 Patienten mit sogenannten Swimmingpool- oder Aquariumgranulomen wurden elektronenoptisch untersucht. Das cytohistologische Spektrum umfaßt sowohl akute exsudative, als auch chronische proliferative Entzündungszeichen. Bereits im 3 Wochen alten Granulom sind Epitheloidzellen und Kollagen produzierende Fibroblasten nachweisbar. Das Mycobacterium marinum-Granulom stellt gemäß dem cytologischen Aufbau ein sog. High-turnover Granulom mit allergischer Genese dar. Es entspricht damit mycobacteriellen Dermatosen bei bestehender guter Abwehrlage (Lupus vulgaris, tuberkuloide Lepra). In Abbau befindliche Mycobacterien konnten in wenigen Phagocyten entdeckt werden. Die Ultrastruktur des lebenden Erregers wird vergleichsweise von tierexperimentellem Material präsentiert. Geschwungene und ringförmige parallele Membranen (“Worm-like structures”) wurden im Cytoplasma von transformierten Makrophagen und in Fibroblasten beobachtet. Fadenförmige quergebänderte Strukturen (Periodizität 170–180 Å) im Lumen des rauhen endoplasmatischen Reticulums von einigen Fibroblasten werden als intracellulär aggregierte Kollagenpräcursoren interpretiert.
    Notes: Summary 3 biopsies of 3–5 week-old nodular lesions in 2 patients with socalled swimming-pool (aquarium-) granuloma have been examined by electron microscopy. The cytohistological spectrum simultaneously comprises acute exudative as well as chronic proliferative phenomena. Epithelioid cells and collagen producing fibroblasts already conspicious in 3 week-old granuloma. According to the cytological composition the Mycobacterium marinum granuloma represents a high-turnover granuloma with immunogenic origin. It is comparable to mycobacterial diseases in the presence of well developed cell mediated immunity (Lupus vulgaris, tuberculoid leprosy). Degrading mycobacteria have been rarely detected in phagocytes and are compared with viable bacilli in macrophages of experimentally infected mice. Curved and annular parallel membranes (“worm-like structures”) in the cytoplasm of transformed macrophages and in fibroblasts presumably originate from the membranes of endoplasmic reticulum. Cord-like structures with transverse bands (periodicity 170–180 Å) in the lumen of RER of some fibroblasts are interpreted as intracellularly aggregated collagen precursors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455392
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    Collagen metabolism in granulating wounds of rat skin (1978)
    Springer
    Archives of dermatological research 263 (1978), S. 207-214 
    Details
    ISSN: 1432-069X
    Keywords: Wound healing ; Collagen metabolism ; Collagen degradation ; Fibroblasts ; Ultrastructure ; Wundheilung ; Kollagenstoffwechsel ; Kollagenabbau ; Fibroblasten ; Ultrastruktur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Kollagenstoffwechsel in granulierenden Hautwunden der Ratte wurde mittels biochemischer, tracerkinetischer und elektronenmikroskopischer Methoden untersucht. Die Ablagerung von Kollagen in Hautwunden der Ratte war nicht nur das Ergebnis eines Anstiegs der Kollagensynthese, sondern wurde ebenso durch eine Abnahme des Kollagenabbaus bedingt. Unsere Ergebnisse zeigten signifikante Unterschiede im Kollagenumsatz zu verschiedenen Zeiten der Wundheilung. Der herabgesetzte Kollagenkatabolismus in den frühen Stadien der Wundheilung steuerte in entscheidender Weise zur Kollagenakkumulation im Wundgebiet bei. Während späterer Stadien, zum Zeitpunkt der Wundkontraktion und der Remodellierung der Narbe, stieg die Umsatzrate des Kollagens an. Die dargestellten Ergebnisse werden im Zusammenhang mit den allgemeinen Kriterien der Narbenbildung diskutiert.
    Notes: Summary Collagen metabolism in granulating wounds of rat skin was studied with biochemical, isotopic and electron microscopical methods. Deposition of collagen in rat skin wounds was not only the result of an increase in collagen synthesis but it was also caused by a decrease in collagen degradation. Our investigations showed significant differences in the collagen turnover at different times of wound healing. Decreased collagen catabolism at the early stages of wound healing contributed decisively to collagen accumulation in the wound area. At later stages, during wound contraction and remodelling of the scar, the rate of collagen degradation rose. The above-mentioned results are discussed in the context of general criteria of scar formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446442
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    Morphological, biochemical, ultrastructural, tissue culture and clinical observations of typical and aggressive craniopharyngiomas (1978)
    Springer
    Acta neuropathologica 43 (1978), S. 191-203 
    Details
    ISSN: 1432-0533
    Keywords: Cultured ; Craniopharyngioma ; Typical ; Atypical ; Ultrastructure ; Electron microscopy ; Biochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Craniopharyngiomas are tumors of the suprasellar area, which are often cystic, encapsulated and slow-growing. Certain of these tumors can behave in an aggressive manner and either invade surrounding structures or recur. In order to determine characteristics which may aid in distinguishing typical from atypical lesions, a study of biopsy and tissue culture specimens from 25 human craniopharyngiomas was undertaken. Tissue culture observations reveal two distinct cell populations. Typical lesions grew in culture in an orderly epithelial pattern and had desmosome-tonofibril aggregates and smooth surface topography demonstrable by electron microscopy. In the atypical tumors the cell growth was irregular, with mitotic activity, cholesterol crystals and features characteristic of neoplastic transformation, such as surface microvilli, an increase of cytoplasmic basophilia, size and number of nucleoli and retraction of cytoplasm. Correlation with the clinical status of the patients suggests that tumors of the four patients which exhibited atypical features in culture behaved more aggressively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691578
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    Dysplastic gangliocytoma of the cerebellum—An ultrastructural study (1978)
    Springer
    Acta neuropathologica 42 (1978), S. 1-5 
    Details
    ISSN: 1432-0533
    Keywords: Dysplastic gangliocytoma ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of dysplastic gangliocytoma of the cerebellum, a rare disorder with unknown etiology and pathogenesis, was studied ultrastructurally. The intranuclear inclusions identified were not seen to be of viral origin. The ultrastructural characteristics of the abnormal cells support the prevailing theory that these cells represent hypertrophied granular neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01273258
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    Choroid plexus papilloma: Light and electron microscopic study of three cases (1978)
    Springer
    Acta neuropathologica 44 (1978), S. 235-239 
    Details
    ISSN: 1432-0533
    Keywords: Choroid plexus papilloma ; Ultrastructure ; Cytoplasmic ; Inclusions ; Silver bodies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Three cases of choroid plexus papilloma were studied by light and electron microscopy. All had the typical papillary pattern, and, in addition, two exhibited solid areas of tumor growth which predominated in one case. PAS positive (diastase resistant) and argyrophilic cytoplasmic inclusions were present in all three tumors but were particularly abundant in the predominantly solid one. Ultrastructurally, the inclusions appeared as irregularly shaped structures containing lipid droplets, filamentous material and microtubules, and resembled the “silver bodies” of Biondi found in normal choroid plexus. Along with other ultrastructural features of normal choroid plexus, these cytoplasmic inclusions may be helpful in the differential diagnosis of papillary tumors involving the ventricular system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691073
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    Primary cerebral neuroblastoma: A light and electron microscopic study (1978)
    Springer
    Acta neuropathologica 41 (1978), S. 119-124 
    Details
    ISSN: 1432-0533
    Keywords: Neuroblastoma ; Small-cell neoplasm ; Cerebral ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A small-cell neoplasm in the left temporal lobe of a 10 and a half year old boy was studied by light and electron microscopy. Routine sections of the mass showed a differentiating neuroblastoma with Homer Wright rosettes, several foci of immature neoplastic neurons (ganglion cells), many mitoses, arcas of necrosis and tumor vessels showing endothelial proliferation. Ultrastructurally, most cells resembled early fetal neuroblasts and also were similar to those in murine and peripheral human neuroblastomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00689762
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    Nemaline myopathy: Histological, histochemical and ultrastructural studies (1978)
    Springer
    Acta neuropathologica 42 (1978), S. 33-41 
    Details
    ISSN: 1432-0533
    Keywords: Nemaline myopathy ; Neuromuscular junction ; Myotendinous junction-like structure ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Histological, histochemical and ultrastructural studies were performed on muscle biopsies from three siblings with congenital nemaline myopathy. Histological studies revealed type I fibre atrophy and type II fibre paucity. Ultrastructural studies of intramuscular nerves showed that the axonal diameters were very narrow compared with the width of myelin lamellae. Granular or membranous osmiophilic material occurred in the adaxonal Schwann cell cytoplasm and had a periodicity of 33–38Å. The neuromuscular junctions showed degenerative features such as glycogen granules or myelin figures in 27.1% of total terminal axons. The secondary synaptic clefts were markedly decreased in number and short in length. Myotendinous junction-like structures were found in 5.5% of the muscle fibres near the neuromuscular junctions, and often near sites of fibre-splitting. Rods in nemaline myopathy might be caused as a result of longitudinal splitting and disruption of fibres due to deficient regeneration of the muscle fibres associated with neurotrophic abnormalities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01273264
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Ultrastructure of oncocytic adenoma of the human pituitary gland (1978)
    Springer
    Acta neuropathologica 41 (1978), S. 169-171 
    Details
    ISSN: 1432-0533
    Keywords: Pituitary gland ; Oncocytic adenoma ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two cases of oncocytic adenoma occurring in the pituitary are reported. Both were men aged 40 and 50 years respectively and there was no evidence of endocrine abnormality. In both the tumours many cells showed abundant acidophilic finely granular cytoplasm which had not stained positively with PAS-orange G stain. Electron microscopically the cells contained numerous mitochondria associated with marked reduction of other cytoplasmic organelles including the secretory granules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00689770
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    The spreading of focal brain edema induced by ultraviolet irradiation (1978)
    Springer
    Acta neuropathologica 42 (1978), S. 223-229 
    Details
    ISSN: 1432-0533
    Keywords: Irradiation edema ; Gravimetry ; Ultrastructure ; Vesicular transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Focal brain edema limited to one cerebral hemisphere was produced by ultraviolet irradiation of the exposed cortex. Tissue water content was determined by the gravimetric method which allows microsampling. Therefore, the spread of edema around the small necrotic area could be mapped more precisely than by determination of dry weight which calls for larger samples. As early as 30 min following irradiation, hyperemia and swelling of the brain are observed under the operating microscope. This correlates with venous stasis, hyperemia, and broadened perivascular spaces around venules and large capillaries accompanied by a marked rise in the specific weight of the tissue. After 4 h an edema front can be observed spreading from the perinecrotic zone in which there is a marked rise in endothelial cell vesicular activity. Edema reaches maximum levels in the deep white matter at 48 h post irradiation with normalisation of the tissue water content after 96 h. The velocity at which the edema front spreads from the cortex to the periventricular area lies in the range of 0.25 mm/h. Edema reabsorption coincides with signs of retrograde micropinocytosis in endothelial cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690361
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    Myélinopathie par intoxication oxycarbonée. Neuropathologie ultrasturale (1978)
    Springer
    Acta neuropathologica 43 (1978), S. 153-159 
    Details
    ISSN: 1432-0533
    Keywords: Myelin ; Oligodendroglia ; Human pathology ; Ultrastructure ; Carbon monoxyde ; Anoxia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A 24-year-old woman was found comatose after 2 days of cephalalgia and vomiting. An immediate diagnosis of carbon monoxyde poisoning was disclaimed when blood carbon monoxyde was found to be 1.75 ml/100. A diagnosis of acute intracranial hypertension led to trephination with ventricular punction and brain biopsy on the third day. The patient died on the eleventh day. Ultrastructural study of biopsy tissue showed nearly normal cortex, and injured white matter, with disrupted or destroyed myelin and pycnotic oligodendroglia in contrast with nearly normal axons, astrocytes, and capillaries. Autopsy showed a typical semioval center myelinopathy. After discussion of the histotoxic, vascular, and edema theories for myelinopathy pathogenesis, primary oligodendrogial lesion is considered, and correlated with the diphasic evolution often observed in the course of carbon monoxyde myelinopathy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00685010
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Étude en microscopie électronique et par cytophotométrie à balayage de la structure et de la distribution de la chromatine dans les noyaux des cellules cartilagineuses deTriturus cristatus âgés au cours de la régénération (1978)
    Springer
    Development genes and evolution 184 (1978), S. 195-211 
    Details
    ISSN: 1432-041X
    Keywords: Ultrastructure ; Scanning cytophotometry ; Chromatin ; Chondrocytes ; Regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Les cellules cartilagineuses des membres postérieurs deTriturus cristatus en régénération après amputation, ont été étudiées en microscopie électronique et par cytophotométrie à balayage. Nous nous sommes intéressés à la structure et à la distribution de la chromatine mais aussi à différents organites cytoplasmiques. Dans l'étude de cytophotométrie à balayage, la chromatine a été considérée à travers son constituant majeur, l'ADN, coloré par la réaction de Feulgen. Au cours de la régénération du membre, l'hétérochromatine initialement condensée, essentiellement accolée à la membrane nucléaire se décondense. Les vacuoles du cytoplasme, caractéristiques des animaux âgés par rapport aux animaux jeunes, disparaissent, les mitochondries et le reticulum endoplasmique rugueux deviennent plus abondants. Les caractéristiques nucléaires de l'activation cellulaire apparaissent précocement, précédent les modifications cytoplasmiques et conduisent à des cellules en tous points identiques aux cellules d'animaux jeunes en dehors de tout processus régénératif. Cette phase d'euchromatisation et de restructuration cytoplasmique est peut-être nécessaire à l'accroissement d'activité métabolique et à la division cellulaire qui suivent. Son déroulement peut expliquer tout au moins le ralentissement de la régénération observé chez les animaux âgés par rapport aux animaux jeunes.
    Notes: Summary Cartilaginous cells of aged newts (Triturus cristatus) were studied during hind limb regeneration. The electron microscope was used to study the structure and distribution of chromatin in the cell nuclei, while the DNA content of the chromatin was measured by means of a scanning cytophotometer. Changes in the ultrastructure of the cytoplasm during regeneration were also studied. It was observed that the structure and distribution of chromatin in the activated cell is greatly modified. In the non-activated cell of the aged newt, the chromatin is found highly condensed and distributed peripherally close to the nuclear membrane. In contrast, in the activated cells, the chromatin is much less condensed and is distributed throughout the nucleus. Moreover, cytoplasmic vacuoles, found only in the non-activated aged cells, disappear and an increase in the mitochondria and rough endoplasmic reticulum is also observed. Changes in the nuclear structure are observed prior to the cytoplasmic modifications. It is interesting to note that the process of activation induces structural changes in the aged cells which make these cells appear to be structurally identical to the young cells. This process of rejuvenation takes 3–5 days in the newt. We suggest that these structural changes of the chromatin and cytoplasm in the aged cells are necessary to increase the metabolic activity which precedes cell division. It may also explain why regeneration takes a longer time in the aged animals than in the young ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848254
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    Ultrastrukturell-morphometrische Veränderungen des Ganglion spirale cochleae bei der Ratte nach Beschallung (1978)
    Springer
    European archives of oto-rhino-laryngology and head & neck 220 (1978), S. 193-199 
    Details
    ISSN: 1434-4726
    Keywords: Cochlear spiral ganglion ; Ultrastructure ; Morphometry ; Influence of broad band noise ; Cochleare Spiralganglien ; Ultrastruktur ; Morphometrie ; Beschallung mit Breitbandrauschen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Nach 40minütiger Beschallung des Ohres mit Breitbandrauschen von 105 dB SPL waren bei den Ratten elektronenoptisch noch keine sicheren Veränderungen an den Spiralganglienzellen festzustellen. Erst ultrastrukturell-morphometrisch ließen sich statistisch signifikante Veränderungen des Chondrioms und der Organellen des Leistungsstoffwechsels bei den granulären Spiralganglienzellen nachweisen. Der Volumenanteil der Mitochondrien im Einheitsvolumen Zytoplasma nahm zu. Auch das Volumen und die Oberfläche des RER sowie das Volumen der freien Ribosomen und der Nucleolen vergrößerten sich im Einheitsvolumen Zytoplasma bzw. pro Zelle. Die physiologische Bedeutung dieser Veränderungen wurde diskutiert. Die Resultate zeigen u. a., daß Veränderungen der Cytoarchitektur in den granulären Spiralganglienzellen morphometrisch früher als elektronenoptisch registriert werden können.
    Notes: Summary The comparison of ultrastructural and ultrastructural-morphometric findings in spiral ganglion cells subsequent to broad band noise with 105 dB SPL over a period of 40 min demonstrates that there are morphometric changes of the cytoarchitecture of granular ganglion cells even without evident ultrastructural changes. Morphometric analyses shows a significant extention of the volume proportion of mitochondria per unit volume cytoplasm. The volume and the surface of the rough endoplasmic reticulum, the volume of the free ribosomes and the average single volume of the nucleoli increase per granular ganglion cell. The physiologic significance of these changes is discussed. The results show that changes of the cytoarchitecture of granular spiral ganglion cells are earlier detected by morphometry than by ultrastructural description.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00457487
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    Ribosome-submembranous density complex (1978)
    Springer
    Acta neuropathologica 44 (1978), S. 249-250 
    Details
    ISSN: 1432-0533
    Keywords: Organelle complex ; Ribosomes ; Meningioma (malignant) ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Ultrastructural study of a malignant meningioma revealed an organelle complex composed of: (1) A band-like densification of the cell cytoplasm adjacent to and in contact with the cell membrane. (2) An arciform filament immediately subjacent to it, with concavity directed away from the cell membrane. (3) A row of regularly spaced ribosomes located in the concavity, but at some distance from the arciform filament. (4) A pericellular condensation of interstitial ground substance. Occasionally, a second, thinner filament was seen “threading” the ribosomes together. Its morphology was consistent with that described for messenger RNA. It is suggested that the ribosomes are engaged in the synthesis of proteins for other portions of the organelle complex and that the ultimate role of the specialized unit would be that of an attachment device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691076
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    The tegmental reticular nucleus: a cytoarchitectonic, golgi, fluorescence histochemical and ultrastructural analysis (1978)
    Springer
    Cell & tissue research 194 (1978), S. 463-479 
    Details
    ISSN: 1432-0878
    Keywords: Tegmental reticular nucleus (Bechterew) ; Serotonin neurons ; Reticular formation ; Ultrastructure ; Synaptic organization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The organization of the tegmental reticular nucleus of von Bechterew (TRN) has been analyzed in Nissl and Golgi material, by fluorescence histochemistry, and by electron microscopy. In the albino rat, the TRN situated in the ventral paramedian midbrain and pontine reticular formation, contains two principal types of neurons. The first is a population of large multipolar neurons (40–80 μm diameter) with abundant Nissl substance and 4–7 smooth dendrites which may extend up to 500 μm in length. The second is medium-sized fusiform neurons (14–40 μm diameter) with less Nissl substance and two primary dendrites that originate from each pole of the soma and have a more closely ramifying dendritic field. Fluorescence histochemistry demonstrates that serotonin neurons constitute one component of the medium-sized neuron group. A third neuronal type, infrequently encountered at the outer margins of the nucleus, corresponds to the large, multipolar isodendritic neurons (soma diameter 40–80 μm) of the pontine reticular formation. Ultrastructural analysis of the TRN also demonstrates large and medium sized neurons which are present, together with numerous large dendritic trunks, between bundles of myelinated axons traversing the TRN in both rostrocaudal and transverse planes. This distinctive arrangement produces the appearance of “gray islands” between myelinated axon bundles. Within these areas, abundant synaptic terminals occupy a large proportion of the available terminal space on the surface of dendrites and perikarya, particularly of the large type of neuron. Two types of synaptic terminals are encountered; S-type synapses contain lucent spherical synaptic vesicles and F-type synapses contain flattened lucent vesicles. In addition there is a small number of synaptic terminals with scattered 100–120 nm diameter dense core vesicles in a population of smaller pleomorphic vesicles. These account for no more than 10% of the synaptic terminal population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236166
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    Histophysiological studies on the corpus allatum of Leucophaea maderae (1978)
    Springer
    Cell & tissue research 194 (1978), S. 533-545 
    Details
    ISSN: 1432-0878
    Keywords: Corpus allatum ; Insects ; Ovariectomy ; Ultrastructure ; Cytophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the corpora allata of 29 Leucophaea ovariectomized in the nymphal stage and maintained up to an adult age of 28 months was examined. In general, the subcellular morphology of these glands has much in common with that of normal female controls examined at the height of their activity. In addition, the most “typical”of the gonadectomy cases show certain distinctive features that are either absent or much less prominent in unoperated controls. Of primary interest is the striking abundance of smooth surfaced endoplasmic reticulum observed in many but not all of the castrates. Since this organelle is implicated in the biosynthesis of juvenile hormone, the factor normally responsible for yolk deposition, its increase, together with certain additional ultrastructural features, is indicative of an exceptionally high rate of hormone production. An explanation for the putative hyperactivity displayed to various degrees by the experimental animals may well be the constancy of the demand on their corpora allata, since removal of the ovaries abolishes the afferent signals in response to which, in the intact female, the brain turns off these glands during the long periods of gestation. That the synthetic effort may eventually level off, even in the absence of regular inhibitory stimuli, is suggested by the corpora allata of those castrates, the ultrastructure of which reflects moderate activity or possibly further regression
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236172
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    The eyes of mesopelagic crustaceans (1978)
    Springer
    Cell & tissue research 195 (1978), S. 59-79 
    Details
    ISSN: 1432-0878
    Keywords: Compound eyes ; Arthropod vision ; Deep-sea crustaceans ; Ultrastructure ; Thysanopoda tricuspidata (Euphausiacea)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The compound eyes of the mesopelagic euphausiid Thysanopoda tricuspidata were investigated by light-, scanning-, and transmission electron microscopy. The eyes are spherical and have a diameter that corresponds to 1/6 of the carapace length. The hexagonal facets have strongly curved outer surfaces. Although there are four crystalline cone cells, only two participate in the formation of the cone, which is 90–120 μm long and appears to have a radial gradient of refractive index. The clear zone, separating dioptric structures and retinula, is only 90–120 μm wide. In it lie the very large oval nuclei of the seven retinula cells. Directly in front of the 70 μm long and 15 μm thick rhabdom a lens-like structure of 12 μm diameter is developed. This structure, known in only a very few arthropods, seems to be present in all species of Euphausiacea studied to date. It is believed that the rhabdom lens improves near-field vision and absolute light sensitivity. Rod-shaped pigment grains and mitochondria of the tubular type are found in the plasma of retinula cells. The position of the proximal screening pigment as well as the microvillar organization in the rhadbdom are indicative of light-adapted material. The orthogonal alignment of rhabdovilli suggests polarization sensitivity. Behind each rhabdom there is a cup-shaped homogeneous structure of unknown, but possibly optical function. Finally, the structure and the function of the euphysiid eye are reviewed and the functional implications of individual components are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233677
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    Changes in structure of ventral epidermis of Rana ridibunda during metamorphosis (1978)
    Springer
    Cell & tissue research 195 (1978), S. 111-122 
    Details
    ISSN: 1432-0878
    Keywords: Epidermis ; Skin ; Ultrastructure ; Rana ; Metamorphosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The organisation of the ventral epidermis organisation was followed throughout ontogenesis in Rana ridibunda. Epidermis of tadpoles with 2–3 limbs was organised into two layers: a stratum germinativum consisting of elongated columnar cells, and an outer stratum corneum consisting of two types of cuboid cells. Two types of cells can be distinguished; they are a light (clear) cell and a dark (dense) cell. In the 4-legged tadpoles the stratum corneum cells start to flatten and a replacement layer appeared underneath. A well-defined stratum germinativum is found and within it, epidermal glands. Moulting took place for the first time in tadpoles just before metamorphosis, and a well-organised stratum granulosum was formed still containing the two main types of epidermal glands. The flask cells appear in the juveniles for the first time, greatly increasing in numbers in the adult epidermis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233680
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    Effects of acute cold exposure on the ultrastructure of the mouse pinealocyte (1978)
    Springer
    Cell & tissue research 195 (1978), S. 461-469 
    Details
    ISSN: 1432-0878
    Keywords: Pineal gland ; Cold ; Ultrastructure ; Mouse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural changes in pinealocytes were investigated qualitatively and quantitatively in mice exposed to low temperatures at 0° C or 5° C for 30 or 60 min. A quantitative estimation of the granulated vesicles of about 100 nm diameter in pinealocytes demonstrated that the number of these vesicles per pinealocyte in mice exposed to cold at 0° C or 5° C increased remarkably as compared with that of the controls. This finding indicates that cold stimuli may activate the formation of the granulated vesicles in pinealocytes. In mice exposed to cold at 0° C for 60 min, granulated vesicles were often found in groups close to the plasma membrane of the pinealocyte cell bodies or processes, indicating the release of the vesicle content into the extracellular spaces. Additionally, the pinealocytes of the mice exposed to cold at 0° C for 60 min were characterized by the frequent occurrence of lysosome-like bodies and filaments. The development of these structures in response to severe cold may represent a depressed functional state of pinealocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233889
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    The ultrastructure and function of follicle cells in Foucartia squamulata (Herbst) (Curculionidae) (1978)
    Springer
    Cell & tissue research 189 (1978), S. 347-353 
    Details
    ISSN: 1432-0878
    Keywords: Vitelline membrane ; Chorion ; Ultrastructure ; Curculionidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The follicle cells of Foucartia squamulata are involved in the formation of both vitelline membrane and chorion. Precursors for these egg coverings are synthesized by the rough endoplasmic reticulum and condensed within dictyosomes. The vitelline membrane and the chorion appear on the oocyte surface simultaneously, which is an unusual phenomenon for insects. The follicular epithelium has not been found to contribute to vitellogenesis in the species under study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209282
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    Oogenesis in Acerentomon gallicum Jonescu (Protura) (1978)
    Springer
    Cell & tissue research 189 (1978), S. 365-374 
    Details
    ISSN: 1432-0878
    Keywords: Previtellogenesis ; Oocyte ; Ultrastructure ; Acerentomon gallicum ; Protura
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary At the onset of previtellogenesis, the oocytes of Acerentomon gallicum begin to grow and increase their content of organelles. The nuage material in the oocytes at first increases in amount, then declines gradually to disappear completely from oocytes that have attained 50 μm in diameter. During the growth period, new dictyosomes, mitochondria and ribosomes appear. Numerous vesicles become detached from the cell membrane and subsequently fuse into cisternae, thus forming extensive complexes of the rough endoplasmic reticulum. In oocytes with diameters between 50 and 100 μm the Golgi complexes show a considerable increase in activity, and many lamellar bodies arise from mitochondria that have undergone specific transformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209284
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    Synaptic junctions in the sinus gland of the freshwater prawn Palaemon paucidens (1978)
    Springer
    Cell & tissue research 189 (1978), S. 435-440 
    Details
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Sinus gland ; Synapses ; Palaemon ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Two types of neurosecretory fibers, designated as Type 5 and Type 6 axons, in the sinus gland of the freshwater prawn, Palaemon, establish contact with other neurosecretory axons by means of synaptic junctions. This finding strongly supports the view that release of some neurohormones from the eyestalk may be regulated by neurosecretory neurons through synaptic transmission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00209131
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    Leptomeric fibrils and T-tubule desmosomes in the Z-band region of the mouse heart papillary muscle (1978)
    Springer
    Cell & tissue research 188 (1978), S. 205-215 
    Details
    ISSN: 1432-0878
    Keywords: Myocardium ; Mouse ; Ultrastructure ; Leptofibrils ; Desmosomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The papillary muscle of the heart of adult white mice is investigated. Intrafibrillarly located leptomeric fibrils, frequently encountered in the Z-band region of the myofibrils. The leptomeric fibrils are always running in a transverse direction and often in close proximity to the transverse tubules (which are also located at this level). There seems to be a close connection between the dense striae of the leptofibrils and the Z-bands of ordinary myofibrils. The leptomeric fibrils are spindle-shaped and have a length varying between 0.6 and 1.2 μm. The banding periodicity of the fibrils is approximately 0.16 μm. Occasionally desmosomes are observed in the T-tubule system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222631
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    The posterior pituitary of the garden dormouse (Eliomys quercinus L.) (1978)
    Springer
    Cell & tissue research 188 (1978), S. 189-204 
    Details
    ISSN: 1432-0878
    Keywords: Neural lobe of hypophysis ; Hibernating mammals ; Ultrastructure ; Neurosecretory granules ; Whorls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'ultrastructure de la posthypophyse du Lérot a été examinée à différents stades du cycle annuel de ce rongeur hibernant. Il n'a pas été observé de différences évidentes entre les stades étudiés, et sont donc présentées ici les caractéristiques générales retrouvées chez tous les animaux. Les axones neurosécréteurs et leurs terminaisons peuvent être divisés en deux catégories suivant l'aspect des grains de neurosécrétat et des microvésicules présents. Le premier type contient des grains arrondis, à contenu d'apparence homogène, avec des microvésicules rondes. Dans les autres axones, les grains sont de forme variable, souvent allongés, et leur contenu présente deux sortes d'organisations cristallines; les microvésicules y sont en majorité aplaties. Considérant comme improbable que cette dualité résulte seulement d'un artefact, trois hypothèses sont envisagées. La dualité d'aspect des grains peut être liée à leur contenu en hormone (ocytocine ou vasopressine); ou bien l'aspect des grains peut correspondre à leur degré de maturation. Il est possible aussi que ces explications soient toutes deux valables. Par ailleurs, les pituicytes du Lérot contiennent fréquemment un réticulum endoplasmique organisé en lamelles concentriques (whorls). La signification de ces formations reste pour l'instant obscure.
    Notes: Summary Ultrastructural examination of the posterior pituitary of the garden dormouse (Eliomys quercinus L.) was carried out at different times in the annual cycle of this hibernating rodent. Obvious differences between experimental groups have not been observed, and the results presented here must be considered as general features of the garden dormouse posterior pituitary. Neurosecretory axons and endings can be divided into two types, according to different aspects of neurosecretory granules (NSG) and microvesicles (MV). One type contains spherical NSG with homogeneous cores and round MV. In the other type, NSG have various, often elongated, shapes. Their content shows two types of crystalline structures and most of the MV have flattened aspects. As it is very unlikely that this duality in NSG is a result of an artefact of fixation, three hypotheses are presented as explanation. The duality of NSG might be related either to their hormonal content (oxytocin or vasopressin) or to their degree of maturation. Moreover, both explanations may be valid. In the species studied, pituicytes often contain concentric lamellar structures of the endoplasmic reticulum (whorls), the significance of which remains obscure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222630
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Changes in the adrenal cortex of the rat after chronic administration of the steroidogenic inhibitor U-8113 (1978)
    Springer
    Cell & tissue research 190 (1978), S. 123-134 
    Details
    ISSN: 1432-0878
    Keywords: Adrenal ; Steroidogenesis ; Inihibitor ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In concert with studies of the effects of various pharmacologic inhibitors of corticosteroidogenesis on adrenocortical morphology, U-8113, an analog of amphenone B, was administered daily to Sprague-Dawley rats for 7, 14, 21 or 30 days. The primary morphological responses involved increases in adrenal weight, width of zona fasciculata, width of zona reticularis, intracellular lipids, mitochondrial size, mitochondrial vacuolation and crystalline-like inclusions, small coated vesicles, lysosomes, autophagic vacuoles and cholesterol ester clefts. In particular, the increases in lysosomes, coated vesicles and autophagic vacuoles containing morphologically altered mitochondria were considered reflective of mechanisms designed to maintain cellular integrity amidst functional impairment. Lipid analysis revealed marked increases in cholesterol esters and phospholipids, supportive of morphological observations. When permitted a 14 day recovery period following either 14 or 30 days of inhibitor therapy, most fine structural alterations and lipid derangements were diminished, and the cells approximated normal parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00210042
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    An ultrastructural study of regeneration of minced smooth muscle in the vas deferens of the guinea-pig (1978)
    Springer
    Cell & tissue research 190 (1978), S. 481-493 
    Details
    ISSN: 1432-0878
    Keywords: Smooth muscle ; Regeneration ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron microscopic studies were made of the regeneration of minced smooth muscle of the vas deferens of the guinea-pig 3 days to 15 weeks after operation. At 3–5 days the mince contained degenerating smooth muscle cells and dedifferentiating cells showing characteristics of embryonic smooth muscle cells: numerous free ribosomes, well developed rough endoplasmic reticulum and Golgi apparatus with few peripherally placed myofilaments associated with dense bodies. During the first two weeks of regeneration, scattered cells surrounded by debris and collagen were separated by a large extra-cellular space. After three weeks, extracellular space was reduced to near normal values. Regenerating cells had a shorter length than normal cells, but during later stages of regeneration they showed an increase in diameter. Muscle effector bundles began to form after 2 to 3 weeks. Initially there were large gaps between the muscle cells, but at later stages of bundle formation, the extracellular space between the muscle cells was much reduced. From 3 weeks, arterioles appeared between the smooth muscle bundles in the regenerating areas. Regeneration of individual smooth muscle cells was complete by 15 weeks after the operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219559
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    The ultrastructure of pinealocytes in the golden mole (Amblysomus hottentotus) with special reference to the granular vesicles (1978)
    Springer
    Cell & tissue research 191 (1978), S. 39-56 
    Details
    ISSN: 1432-0878
    Keywords: Pinealocytes ; Golden mole ; Secretory process ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les pinéalocytes de la glande pinéale de la Taupe dorée Amblysomus hottentotus (Mammifère aveugle et vivant toujours dans une obscurité complète) examinés au microscope électronique ont été comparés à ceux d'autres Mammifères. Une seule population de pinealocytes a été observée. Mitochondries, ribosomes, réticulum endoplasmic granulaire, inclusions lipidiques et rares structures lysosomiales sont présents dans le périkaryon. De nombreux grains de glycogène formant le plus souvent de typiques “accumulations” ont été fréquemment observés associés à des vacuoles. Un grand nombre de vésicules granulaires est la caractéristique première des pinéalocytes. Un phénomène d'excrétion, caractérisé par une dissolution in situ du coeur dense, a été observé. L'importance physiologique de ces vésicules granulaires est discuté.
    Notes: Summary The ultrastructure of the pinealocytes of the golden mole (Amblysomus hottentotus), a blind subterranean mammal living in complete darkness, was examined and compared with that of pinealocytes of other mammals. On the basis of the presence of granular vesicles and glycogen granules, only one population of pinealocytes was found. Large mitochondria, ribosomes, lipid inclusions and scarce lysosomes were observed in the perikaryon. Numerous glycogen granules, often forming typical accumulations, were frequently found to be associated with typical vacuoles. An extraordinary large number of granular vesicles is characteristic of the golden mole pinealocyte. Phenomena of excretion of compound(s) stored in the granular vesicles were identified. Morphologically this is characterized by dissociation of its granular core in situ while its limiting membrane is preserved. The physiological significance of the secretory process characterized by the formation of these granular vesicles is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223214
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 55
    Electronic Resource
    Electronic Resource
    The uterovaginal sperm host glands of the quail (Coturnix coturnix japonica) (1978)
    Springer
    Cell & tissue research 191 (1978), S. 101-114 
    Details
    ISSN: 1432-0878
    Keywords: Sperm host glands ; Quail (Coturnix coturnix jap.) ; Ultrastructure ; Ultracytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural and ultrahistochemical studies were performed on the uterovaginal sperm host glands of the quail (Coturnix coturnix japonica). The proximal parts of the glandular necks are lined by a pseudostratified epithelium, consisting of high columnar ciliated cells and small, irregular shaped, basal cells. The true glandular epithelium is composed only of columnar cells with microvilli on their luminal end. A characteristic luminal feature is a large lipid droplet in the perinuclear region. In the subplasmalemmal region numerous tubular profiles are seen which could represent a cellular resorption system. To evaluate the absorptive capacity of the Uterovaginal sperm host glands, tracer studies with HRP, ferritin, lanthanum and ruthenium red were undertaken. Since between 5 min and 3 h after injection no absorption could be found with the techniques mentioned, it is suggested that phagocytosis of spermatozoa by the glandular epithelium is not likely to occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223219
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 56
    Electronic Resource
    Electronic Resource
    The structure of the nervous system of the pluteus larva of Strongylocentrotus purpuratus (1978)
    Springer
    Cell & tissue research 191 (1978), S. 233-247 
    Details
    ISSN: 1432-0878
    Keywords: Nervous system ; Pluteus ; Ultrastructure ; Echinoderms ; Strongylocentrotus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Tissues that have the ultrastructural characteristics of nervous tissues are associated with ciliary and muscular elements of the pluteus larva of Strongylocentrotus purpuratus. The nerve cells are found along the margins of the ciliary bands, which are composed predominantly of spindle-shaped ciliated cells. The nerve cells contribute axonal processes to a tract of axons, which runs at the base of the ciliary band throughout its length. Axonal tracts, in the esophagus, lie beneath the circumesophageal muscles. Branched microvilli, which have been interpreted as sensory receptors, are located on the oral side of the main ciliary band and connect with the nerve cells in the ciliary band. The nervous structures described here, and other tissues of the pluteus that have been previously described as nervous, are compared on the basis of their association with receptor and effector organs, and their ultrastructural characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222422
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 57
    Electronic Resource
    Electronic Resource
    Ultrastructural observations on the hypothalamo-posthypophysial complex of the Brattleboro rat (1978)
    Springer
    Cell & tissue research 191 (1978), S. 267-286 
    Details
    ISSN: 1432-0878
    Keywords: Neurohypophysis ; Supraoptic nucleus ; Paraventricular nucleus ; Ultrastructure ; Brattleboro rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The hypothalamo-posthypophysial complex of the homozygous Brattleboro rat is characterized by a hyperactivity of its neurons. The neurosecretory fibers, especially in the neurohypophysis, show numerous signs of autophagy and tubular proliferation of the axoplasmic reticulum. These structural alterations, as well as the nematosomes or nucleolus-like bodies encountered in the perikarya, may be related to the chronic hyperactivity of the neurons. They can be reduced by administration of exogenous vasopressin. The numerous liposomes in the pituicytes are paralleled in the neuronal perikarya by a great number of lysosomes. Small dense core vesicles observed in the neurosecretory endings and perikarya may indicate a secretory product distinct from oxytocin and vasopressin. In the homozygous Brattleboro rat, endings of the aminergic type are more numerous than in the normal rat. With respect to the role they may play in the secretory processes, their increase might be secondary to the vasopressin deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222424
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 58
    Electronic Resource
    Electronic Resource
    Ultrastructural and morphometric study of the lung of the European salamander, Salamandra salamandra L. (1978)
    Springer
    Cell & tissue research 191 (1978), S. 343-356 
    Details
    ISSN: 1432-0878
    Keywords: Lung ; Amphibia ; Ultrastructure ; Morphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural and morphometric investigations were performed on the lung of the European salamander, Salamandra salamandra L. Folds of first and second order are covered with a ciliated epithelium containing goblet cells. The respiratory surface of the lung is lined by a single type of cell which, in amphibians, combines features of type I and type II alveolar cells of the mammalian lung. In the salamander the respiratory and ciliated epithelial cells as well as goblet cells possess electron dense and lucent vesicles in their cytoplasm as well as lamellar bodies. A small amount of surfactant, composed most probably of phospholipids and mucopolysaccharides, was observed covering the entire inner surface of the lung. Morphometric methods were used to determine the dimensions of the perinuclear region of pneumocytes, the thickness of the air-blood barrier and lung wall, and also the diameter of capillaries. The thickness of the respiratory air-blood barrier was found to be considerably higher than that of the corresponding barrier in mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222429
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 59
    Electronic Resource
    Electronic Resource
    Masthead (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978) 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090101
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 60
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A2 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 61
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A5 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090103
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 62
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A6 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090104
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 63
    Electronic Resource
    Electronic Resource
    Dechema - Informationsblatt (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A7 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090105
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 64
    Electronic Resource
    Electronic Resource
    Die Wirkung mechanischer Einflußgrößen bei der Rißkorrosion von Kohlenstoff-Mangan-StählenAuszugsweise vorgetragen auf der 7. Sitzung der Arbeitsgruppe “Korrosion und Werkstoffverhalten” des DECHEMA-Fachausschusses “Werkstoffe und Konstruktion im Chemie-Apparatebau”, Frankfurt 16.11.1976. Mechanical Factors Influencing Corrosion Cracking of Carbon-Manganese Steels (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 1-14 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Knowledge about stress corrosion cracking and corrosion fatigue until 1970; specific aggressive media to cause stress corrosion cracking: alkali solution, nitrates, ammonia salts - meaning of the constant strain rate technique and stress corrosion cracking in bicarbonate solutions - dependence of tensile stress, strain and strain rate upon time; significance of strain rate - investigations in bicarbonate, carbonate and hydroxide solutions - critical potential ranges - relation between strain rate and low cycle fatigue - theoretical differences between stress corrosion cracking and corrosion fatigue in spite of gradual transient in physical appearances.
    Notes: Stand des Wissens über Spannungsriß- und Schwingungsrißkorrosion bis um 1970; spezifische Medien für Spannungsrißkorrosion: Alkalilauge, Nitrate, Ammoniumsalze - Bedeutung der constant-strain-rate-Technik und Bikarbonat-Spannungsrißkorrosion - Zeitabhängigkeit von Zugspannung, Dehnung und Dehngeschwindigkeit; Bedeutung der Dehngeschwindigkeit - Untersuchungen in Bikarbonat-, Karbonat- und Hydroxidlösungen - kritische Potentialbereiche - Zusammenhang zwischen Dehngeschwindigkeit und langsamer Ermüdung - theoretischer Unterschied zwischen Spannungsrißkorrosion und Korrosionsermüdung trotz phänomenologisch gleitender Übergänge.
    Additional Material: 28 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090106
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 65
    Electronic Resource
    Electronic Resource
    Untersuchungen an stahlfaserverstärktem Aluminium unter Torsions- und Druckbeanspruchungen (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 27-30 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigation of Steel Fiber Reinforced Aluminium under Torsional and Compressive LoadingA fiber-shaped composite material which, due to its fabrication process and internal structure may be called a double fiber composite, and whose strength behaviour is significantly influenced by boundary layers and porosity has been tested by means of two test methods: 1The possibility is demonstrated to determine by a non-destructive elastic torsional test the useful cross section for the utilization of the material, taking the quality-reducing factors into consideration.2Pressure tests have shown good agreement with Timoshenko and Gere's wave theory extended in this particular case. .
    Notes: Die Erprobung eines faserförmigen Verbundwerkstoffes, der durch Herstellungsverfahren und inneren Aufbau als Doppelfaserverbund zu bezeichnen ist und dessen Festigkeitsverhalten durch Grenzschichten und Porosität wesentlich beeinflußt wird, wurde mittels zweier Prüfverfahren durchgeführt: 1Es wird die Möglichkeit aufgezeigt, den nutzbaren Querschnitt für den Einsatz des Materials unter Berücksichtigung der qualitätsmindernden Faktoren im elastischen Torsionsversuch zerstörungsfrei zu ermitteln.2Durch Druckversuche wurde eine gute Übereinstimmung mit der hier erweiterten Wellentheorie von Timoshenko und Gere erzielt. .
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090109
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 66
    Electronic Resource
    Electronic Resource
    Mechanisch-technologische Eigenschaften nickelhaltiger SuperferriteDie diesem Bericht zugrunde liegenden Arbeiten wurden zum Teil mit Mitteln des Bundesministeriums für Forschung und Technologie gefördert (Kennzeichen CVE 40 2). Die Verantwortung für den Inhalt liegt allein bei den Verfassern (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 14-18 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Mechanical and Technological Properties of Nickel Containing SuperferritesHigh chromium ferritic stainless steels with molybdenum and nickel additions, containing low amounts of interstitials, show remarkably good mechanical properties besides their excellent corrosion behaviour. Yield strengths of these materials can be more than the twofold, compared with that of austenitic stainless steels. In contrary to commercial ferritic stainless chromium steels, the Superferrites exhibit remarkable notch impact toughness also at temperatures below 0 °C. These properties as well as their permanent toughness after a welding process permit a good technological workability and, because of the high strength properties, the application of thinner dimensions in construction.
    Notes: Hochlegierte ferritische Chromstähle mit Molybdän- und Nickelzusätzen sowie niedrigen Kohlenstoff- und Stickstoffgehalten weisen neben ihrer hervorragenden Korrosionsbeständigkeit auffallend gute mechanisch-technologische Eigenschaften auf. Diese Werkstoffe können im Vergleich mit austenitischen chemisch beständigen Stählen mehr als doppelt so hohe 0,2%-Dehngrenzen erreichen. Im Gegensatz zu den herkömmlichen ferritischen Chromstählen besitzen sie auch bei Temperaturen unter 0 °C eine bemerkenswerte Kerbschlagzähigkeit. Diese Eigenschaften sowie das bleibende Verformungsvermögen nach einem Schweißvorgang lassen eine gute Verarbeitbarkeit der Stähle im Apparatebau zu, wobei wegen des Festigkeitsvorteils wesentlich dünnere Abmessungen benötigt werden.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090107
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 67
    Electronic Resource
    Electronic Resource
    Graphit als Werkstoff im ApparatebauVorgetragen auf der ACHEMA 76 am 22. Juni 1976. Graphite for the Construction of Chemical Equipment (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 19-27 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The growing interest in the use of graphite as a material for chemical equipment is occasioned by the highly corrosion resistant properties of this low-cost material.Economic and safety specifications require a thorough knowledge of the material's properties and performance and also of the effect of these factors on a particular unit. It is to be considered for instance that the material's compressive strength is 3 to 5 times higher than its tensile strength.Another important characteristic is its static strength: the smaller the stressed volume, the higher the breaking strength. This comparatively good performance is of advantage in cases of high voltage gradients as encountered as edge stresses at the openings of tube plates and nozzles. In such cases the breaking strength may reach twice the value of the rupturing strength.A third characteristic to be mentioned is the high dependence of strength on the parameters of production; the strength decreases, for technological reasons, with increasing size.The following design principles are based on the specific properties and performance of the material: units to be preferably subjected to compressive stressuse of the smallest possible stockmaterial of higher strength to be used in hightension zones (smaller semiproduct dimensions)No cemented joints in highly stressed zones .
    Notes: Graphit zeichnet seine “breite” Korrosionsbeständigkeit bei verhältnismäßig niederen Kosten aus. Er wird deshalb in zunehmendem Maße für hochkorrosionsfeste Apparate eingesetzt. Wirtschaftliche und sicherheitstechnische Forderungen machen eine genaue Kenntnis des Werkstoffverhaltens und dessen Auswirkungen auf ein Bauteil zur Voraussetzung. So ist z. B. die gegenüber der Zugfestigkeit um den Faktor 3 bis 5 höhere Druckfestigkeit zu berücksichtigen. Ein weiteres wichtiges Merkmal ist die statistische Natur der Festigkeit. Je geringer das beanspruchte Volumen ist, desto höher ist die Bruchfestigkeit. Das bedeutet gerade bei hohen Spannungsgradienten, wie sie als Lochrandspannungen an Rohrplatten oder Stutzen auftreten, ein vergleichsweise günstiges Verhalten. In derartigen Fällen kann die Bruchfestigkeit den doppelten Wert der Zug-Bruchfestigkeit erreichen. Als drittes hervorzuhebendes Merkmal ist die starke Abhängigkeit der Festigkeit von den Herstellungsparametern zu nennen; technologisch bedingt nimmt die Festigkeit mit zunehmenden Abmessungen ab.Aus dem Werkstoffverhalten leiten sich folgende Konstruktionsprinzipien ab: Bauteile bevorzugt auf Druck beanspruchen.Stets das kleinstmögliche Halbzeug verwenden.In Zonen hoher Spannung Material höherer Festigkeit einsetzen (kleinere Halbzeugabmessungen).Kittverbindungen nicht in hochbeanspruchte Zonen legen.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090108
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 68
    Electronic Resource
    Electronic Resource
    Zum Zusammenhang zwischen Eigenschaften und Gefügestruktur mehrphasiger Werkstoffe. Teil III: Gefügestruktur und Elastizitätsmodul (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 31-36 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090110
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 69
    Electronic Resource
    Electronic Resource
    TGL-Taschenbuch Korrosionsschutz. Von H. Spindler. 1. Auflage, VEB Deutscher Verlag für Grundstoffindustrie, Leipzig. 1977, 376 Seiten, 17,7 × 21,5 cm, Plasteinband, 20,- DM (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 36-36 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090113
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 70
    Electronic Resource
    Electronic Resource
    Kreiszylinderschalen unter radialen Einzellasten. Von K.-W. Bieger. 1. Auflage, Springer-Verlag Berlin, Heidelberg, New York, 1976, etwa 160 Seiten, 18 Bilder, 108 Tafeln. Gebunden 158,- DM, etwa US $ 64,80 (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 36-36 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 71
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A9 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090114
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 72
    Electronic Resource
    Electronic Resource
    Werkstoffkunde der gebräuchlichen Stähle, Teil 1. Entwicklung der Stahlsorten, ihre Vereinheitlichung und Normung, Teil 1. Vorträge einer vom Verein Deutscher Eisenhüttenleute zusammen mit dem Haus der Technik, Essen, durchgeführten Berichtsreihe. Herausgegeben vom Verein Deutscher Eisenhüttenleute. Format DIN C 5. IV/293 Seiten mit 365 Bildern und 43 Tafeln. 1977. Verlag Stahleisen mbH., 4 Düsseldorf. DM 89,- (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 36-36 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090111
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 73
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A12 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090202
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 74
    Electronic Resource
    Electronic Resource
    Masthead (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978) 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090201
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 75
    Electronic Resource
    Electronic Resource
    ESCA - Untersuchungen zum Aufbau von Oxid-Schichten auf austenitischen Stählen nach SalpetersäurebeanspruchungDie dieser Veröffentlichung zugrunde liegenden Arbeiten wurden aus Mitteln des Bundesministers für Forschung und Technologie im Rahmen des Forschungs- und Entwicklungsprogramms “Korrosion und Korrosionsschutz” gefördert.Herrn Professor Dr. Otto Bayer zum 75. Geburtstag gewidmet (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 37-45 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: ESCA - Investigations of the Passive Films Formed on Austenitic Stainless Steels in Nitric AcidBy means of ESCA the composition and the thickness of passive films formed on austenitic stainless steels were investigated after the attack of nitric acid at various temperatures and acid concentrations.The outermost layers of the oxide film consist of SiO2, then a layer rich of Cr-oxid follows, containing also some Mo in the four- and six-valent state. Ni does not contribute to the oxide film. Cr is also enriched in the metal just below the oxide film.
    Notes: Mittels ESCA wurden Zusammensetzung und Dicke der Oxidschichten ermittelt, die bei der Beanspruchung verschiedener austenitischer Chrom-Nickel-(Molybdän)-Stähle in Salpetersäuren unterschiedlicher Konzentration und Temperatur gebildet werden.Die äußere Schicht besteht aus SiO2; darunter befindet sich eine chromreiche, molybdänhaltige Oxidschicht. Nickel ist am Aufbau der Oxidschichten nicht beteiligt.In der metallischen Matrix unterhalb der Oxidschicht wurde eine Chromanreicherung nachgewiesen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090203
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 76
    Electronic Resource
    Electronic Resource
    Prüfung von Rohren und Formstücken aus Kunststoff.Vortrag gehalten beim Seminar „Einsatz von Kunststoffrohren in der Gasversorgung an der Technischen Akademie e. V., Wuppertal, 24./25. 11. 1977. (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 62-73 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Testing of plastic pipes and fittings
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090206
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 77
    Electronic Resource
    Electronic Resource
    Zum Mechanismus der Wechselfestigkeitssteigerung durch Werkstoffverfestigung und Druckeigenspannungen nach einer OberflächenbehandlungTeilauszug aus der Dr.-Ing. Dissertation des Verfassers, Darmstadt 1977. Berichterstatter Prof. em. Dr.-Ing. H. Wiegand, Darmstadt, Mitberichterstatter Prof. Dr.-Ing. K. H. Kloos, Darmstadt (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 45-56 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Improvement of Fatigue Limit as a Result of Hardening and Macrostresses Due to a Surface TreatmentSurface treatments, that increase the hardness as well as induce surface residual macrostresses, are universaly able to improve the fatigue limit. It is shown, that depending on the shape of specimens both effects together are responsible for the raise of the fatigue strength, which is in contrast to former opinions. The increase of hardness increases the stress required for crack initiation and is thus decident for unnotched specimens, whereas in this case the influence of permanent residual stresses is relatively smaller. Notched specimens of sufficient stress concentration factor kt are determined by the crack propagation conditions, which can be controlled decisively by mean loads. The increase of hardness improves the resistance against crack initiation proportional to the 1/kt portion of the unnotched fatigue limit, but cracks remain nonpropagating as long as a certain minimum alternative stress, which can be raised by compressive residual stresses, is not exceeded. Depending upon concentration factor, mean compressive load and hardness the transition from crack initiation to crack propagation as the criterion for fatigue fracture can be estimated by several fatigue-strength-diagrams, which are evaluated for specimens of constant hardness but are valid for surface hardened specimens as well.
    Notes: Eine universelle Möglichkeit, die Dauerhaltbarkeit von Bauteilen zu verbessern, bieten Oberflächenbehandlungsverfahren, die sowohl die Werkstoffhärte erhöhen als auch Druckeigenspannungen 1. Art in der Randschicht erzeugen. Im Gegensatz zu der im älteren Schrifttum oft vertreten Ansicht, nach der entweder der eine oder der andere Einfluß für den Mechanismus der Wechselfestigkeitssteigerung verantwortlich sein soll, zeigt sich, daß in Abhängigkeit von der Bauteilgeometrie beide Faktoren zusammenwirken. Die Härtesteigerung beeinflußt vornehmlich die Anrißdauerfestigkeit und bestimmt damit das Verhalten glatter Teile; Druckeigenspannungen, sofern sie nicht abgebaut werden, leisten einen geringeren Beitrag. Bei gekerbten Proben ausreichend hoher Formzahl wird der Dauerbruch durch die Rißausbreitungsbedingungen festgelegt, die in entscheidender Weise von Mittelspannungen abhängen. Die Härtesteigerung erhöht zwar proportional zum 1/αk-fachen Teil der Wechselfestigkeit glatter Proben die Beständigkeit gegen die Bildung von Anrissen, diese bleiben aber stehen, sofern nicht eine durch Druckmittelspannungen heraufsetzbare Mindestwechselspannung überschritten wird. Der von Formzahl, Höhe der Druckeigenspannungen und Härte abhängige Übergang von Anrißbildung zu Rißfortschritt als Kriterium für die zum Bruch führende Wechselspannung kann in Dauerfestigkeitsschaubildern abgelesen werden, die für Werkstoffe homogener Festigkeit aufgestellt werden, die aber ebenso für oberflächenverfestigte Proben gelten.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090204
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 78
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A17 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090208
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 79
    Electronic Resource
    Electronic Resource
    Einfluß des Gefügezustandes auf die mechanischen Eigenschaften von (α + β)- TitanlegierungenVortrag gehalten auf dem Werkstoff-Symposium „Titanlegierungen am 18.2.77, Ruhr-Universität Bochum, Institut für Werkstoffe (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 56-62 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of Microstructure on Mechanical Properties of (α + β)-Ti-AlloysThe amount of α- and β-phase in (α + β)-Titanium alloys for example in the alloy TiAl6 V4 may be altered to a large extend by annealing procedures. In the alloy TiAl6 V4 each temperature corresponds to a certain amount of each of these phases, the composition of which is also dependent on annealing temperature. Above about 970 °C the homogeneous β-phase appears. Additions of Iron, Oxygen, Nitrogen and Hydrogen have a great influence on the transition temperature and the distribution of the α- and β-phase. There is a great influence of the distribution of the phases on the mechanical properties. The β-phase and the α-solid solution can be quenched from high temperature and decomposed at a lower temperature, so that intermediate phases as ω from β and α2 from α may be precipitated. The α-solid solution is anisotropic so that texturized samples have different properties in various directions. Based on these fundamental aspects it is shown to what extend these microstructures may influence the mechanical properties especially the fatigue behaviour of (α + β)-Ti-alloys.
    Notes: Die Anteile des α- und β-Titanmischkristalls in (α + β)-Titanlegierungen können z. B. bei der Legierung TiAl6 V4 in großen Bereichen durch Wärmebehandlung variiert werden. Bei jeder Temperatur stellt sich z. B. bei TiAl6 V4 ein bestimmtes Verhältnis zwischen α und β ein, wobei sich die Legierungskonzentration in den einzelnen Phasenanteilen ändert, bis oberhalb etwa 970 °C die reine β-Phase vorliegt. Beimengungen wie Eisen, Sauerstoff, Stickstoff und Wasserstoff verändern die Umwandlungstemperatur und auch die Anteile der jeweiligen Phasen. Die mechanischen Eigenschaften werden durch das Gefüge entscheidend beeinflußt. Sowohl der β-Mischkristall wie auch der α-Mischkristall können von hoher Temperatur abgeschreckt und bei tiefen Temperaturen zum Zerfall gebracht werden, so daß dadurch weitere Zwischenphasen, wie die ω-Phase im β-Mischkristall und die α2-Phase im α-Mischkristall ausgeschieden werden. Der α-Mischkristall weist eine starke Anisotropie auf, so daß mit Textur behaftete Proben eine Richtungsabhängigkeit der mechanischen Eigenschaften aufweisen. Ausgehend von diesen Grundlagen wird gezeigt, wie sich diese Gefügezustände auf die mechanischen Eigenschaften insbesondere bei schwingender Beanspruchung auswirken.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090205
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 80
    Electronic Resource
    Electronic Resource
    Werkstoff - Konstruktion - Fertigung (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 73-76 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ähnlich wie zum Taschentext 55 (Eisenwerkstoffe), der im Jahr 1977 im Verlag dieser Zeitschrift erschienen ist, wird mit dem Abdruck einiger Abschnitte aus dem Taschentext 56 (Metallische Nichteisenwerkstoffe) auf die Bedeutung dieser Werkstoffgruppe hingewiesen. Die Taschentexte der Reihe „Werkstoffkunde“ sollen den Studierenden der Ingenieurtechnik und ebenso den Ingenieur der Praxis mit Wesen und Eigenschaften technischer Werkstoffe bekannt machen. Dabei werden weniger die metallkundlichen als vielmehr die anwendungstechnischen Fragen in den Vordergrund gestellt.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090207
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 81
    Electronic Resource
    Electronic Resource
    Masthead (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978) 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090301
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 82
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A20 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090302
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 83
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A24 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090303
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 84
    Electronic Resource
    Electronic Resource
    Zur Wechselwirkung von MehrfachrissenVeränderte Fassung des Vortrags auf der 7. Sitzung des Arbeitskreises Bruchvorgänge im DVM, 8./10. 10. 1975, Aachen (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 86-92 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: On the Interaction of CracksStress intensity factors for multiple cracks in a plate under tension are reviewed. In addition to the known results for symmetrically arranged cracks the interaction effects due to rotation of one of the cracks relative to the load direction are calculated and in some cases examined experimentally. The results are discussed with reference to the safety assessment of structural components.
    Notes: Spannungsfaktoren von Mehrfachrissen in einer Scheibe unter Zug werden gesichtet. Erweiternd zu den bekannten Ergebnissen für symmetrische Rißanordnungen werden die Wechselwirkungseffekte, die bei der Drehung eines der Risse gegen die angelegte Spannung auftreten, numerisch und zum Teil experimentell untersucht. Die Ergebnisse werden im Hinblick auf Sicherheitsbeurteilung von Bauteilen diskutiert.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090305
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 85
    Electronic Resource
    Electronic Resource
    Derzeitiger Stand der Lebensdauervorhersage für BauteileAus „VDI-Berichte 268, Werkstoff- und Bauteilverhalten unter Schwingbeanspruchung“ - Tagung der VDI- Fachgruppe Werkstofftechnik November 1976 - mit freundlicher Genehmigung der VDI-Verlag GmbH, Düsseldorf. (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 77-85 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The State of the Art in the Fatigue Live Evaluation of ComponentsFor fatigue life estimations of components many compromises must be entered in the utilization of available fatigue design data. The parameters of the chosen design data which do not fit the component to be evaluated are in most cases taken into consideration by very global factors. These factors and the inaccuracies of Miner's Rule provide only a rough estimate of the fatigue life of a component. When the component is allready available, these uncertainties can be reduced by performing a fatigue test with service like load-time histories and a relative Miner's Calculation. For the same reason the total knowledge about the service fatigue behaviour of similar components should be taken into account in the life estimation.
    Notes: Bei praktisch allen Abschätzungen der Schwingfestigkeit eines Bauteils müssen Kompromisse bei der Auswahl der Bemessungs-Diagramme eingegangen werden. Die für das Bauteil nicht zutreffenden Parameter der Bemessungsunterlagen müssen recht pauschal durch Abschlagfaktoren berücksichtigt werden. Zusammen mit den Ungenauigkeiten der Miner-Regel können sich daraus recht erhebliche Fehleinschätzungen der Betriebslebensdauer eines Bauteiles ergeben. Wenn das Bauteil zur Verfügung steht, können diese Unsicherheiten durch einen Versuch mit betriebsähnlichem Kollektiv, verbunden mit einer Relativ-Miner Rechnung zum größten Teil vermieden werden. Aus dem gleichen Grunde sollten alle Kenntnisse über das Schwingfestigkeitsverhalten des Bauteils im Betrieb bei der Berechnung der Lebensdauer berücksichtigt werden.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090304
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 86
    Electronic Resource
    Electronic Resource
    Zum Zusammenhang zwischen Eigenschaften und Gefügestruktur mehrphasiger Werkstoffe. Teil III: Gefügestruktur und Elastizitätsmodul (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 96-100 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: On the relationship between the properties and the microstructure of multiphase materials. Part III: Microstructure and Youngs Modulus of Elasticity
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090307
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 87
    Electronic Resource
    Electronic Resource
    Ultraschallschwächungsmessungen an einem martensitaushärtbaren Stahl (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 92-95 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Ultrasonic Attenuation Measurements of a Maraging SteelThe objective of this study was to investigate the influence of nm-precipitation of a precipitation hardening steel on the ultrasonic attenuation. The applied steel X 2 NiCoMo 1885 was solution annealed and subsequently precipitation hardened at 480 °C at different holding times. A clear correlation between ultrasonic attenuation coefficient for 4 Mc and hardness values measured in the range of the hardness increase can be seen. The particle density of the microstructure given is considered as the common cause of the influence of both parameters. The increase in the particle density leads to a decrease in the ultrasonic attenuation coefficient. The reneward increase in the US-attenuation coefficient may additionally be influenced by the beginning austenit reformation and has not been investigated in more details here.
    Notes: Im Rahmen der hier durchgeführten Untersuchungen wurde der Einfluß von Ausscheidungen im nm-Bereich auf die Ultraschallschwächung an einem ausscheidungshärtenden Stahl untersucht. Der verwendete Stahl X 2 NiCoMo 1885 wurde lösungsgeglüht und anschließend bei 480 °C bei verschiedenen Zeiten ausgehärtet. Die gemessenen Härtewerte im Bereich des Härteanstiegs und der Ultraschall-Schwächungskoeffizient für 4 MHz zeigen eine eindeutige Korrelation. Als gemeinsame Ursache für die Beeinflussung beider Parameter wird die im Gefüge vorliegende Teilchendichte angesehen. Die Zunahme der Teilchendichte führt zu einer Abnahme des US-Schwächungskoeffizienten. Der erneute Anstieg des US-Schwächungskoeffizienten kann zusätzlich durch die einsetzende Austenitrückbildung beeinflußt werden und wurde daher hier nicht näher untersucht.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090306
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 88
    Electronic Resource
    Electronic Resource
    Moderne Konstruktionsstähle - Schweißgeeignete hochfeste Feinkornbaustähle (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 101-109 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090308
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 89
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A25 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090310
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 90
    Electronic Resource
    Electronic Resource
    Werkstoff - Konstruktion - Fertigung. Material - Design - Production (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 109-112 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090309
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 91
    Electronic Resource
    Electronic Resource
    Masthead (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978) 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090401
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 92
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A28 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090402
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 93
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A32 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090403
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 94
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Einfluß des Gefügezustandes auf das Rißausbreitungs-Verhalten bei einsinniger Belastung von TiAl6V4 (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 113-120 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Investigations on the Effect of Microstructure on Crack Propagation during Unidirectional Loading of TiAl6V4Fracture mechanics tests were performed with the titanium alloy Ti-6 Al-4 V between -196°C and room temperatur. Crack propagation behaviour was characterized by the K-Δa-curve, KIo at the onset of stable crack extension and by KQ, determined with the 5% secant method. KQ is strongly dependent on the microstructure, whereas there is a less effect on KIo. For a material with a microstructure with a low fracture toughness the value KQ can be increased considerably by vaccum annealing at 750°C. There is only a small decrease of the yield strength.
    Notes: An der Titanlegierung TiAl6V4 wurden Bruchmechanikversuche zwischen -196°C und Raumtemperatur durchgeführt. Die Charakterisierung des Rißausbreitungsverhaltens erfolgte durch die K-Δa-Kurve bzw. durch KIobeim Einsetzen der stabilen Rißverlängerung und KQ, bestimmt mit dem 5% Sekantenverfahren. Die Gefügeausbildung hat einen großen Einfluß auf KQ, der Einfluß auf KIo ist geringer. Bei einem Material mit Gefüge mit niedriger Rißzähigkeit kann KQ durch eine Glühbehandlung bei 750°C im Vakuum beträchtlich erhöht werden. Die Streckgrenze sinkt dabei nur unwesentlich ab.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090404
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 95
    Electronic Resource
    Electronic Resource
    Verschiebungsvektoren für den Vergleich von Av-T-Kurven (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 176-179 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Shift vectors for the comparison of Cv-T-curvesIt is shown in this paper that a shift in the Cv-T-curves caused by mechanical or thermal treatment, or by irradiation with particles of high energy can be better described by a shift vector given by the inversion points of a functionally determined curve than with the currently used empirical criteria. Moreover, the shift of a whole curve can be described by a vector whose components are the shifts of all parameters used for the calculation of the curve.The resulting vector of a Cv-T-curve may, for instance, be connected functionally with the neutron fluence. This makes it possible to compute shift vectors.
    Notes: In dieser Arbeit wird gezeigt, daß die durch mechanische oder thermische Einwirkung oder durch Bestrahlung mit hochenergetischen Teilchen hervorgerufene Verschiebung von AvT-Kurven durch die Verschiebung des funktionell bestimmten Wendepunktes mit einem Verschiebungsvektor besser beschrieben werden kann als mit den bisher üblichen empirischen Kriterien. Darüber hinaus kann die Verschiebung der gesamten Kurve durch einen Vektor beschrieben werden, dessen Komponenten die Verschiebungen aller zur Berechnung der Kurven verwendeten Parameter sind.Der Ergebnisvektor einer Av-T-Kurve kann z. B. mit der Neutronenfluenz funktionell verknüpft werden. Dies ermöglicht die Berechnung von Verschiebungsvektoren.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090508
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 96
    Electronic Resource
    Electronic Resource
    Fortschritte in der technischen Anwendung von KunststoffverbundsystemenErstveröffentlichung in: VDI-Bericht 277, VDI-Verlag GmbH, Düsseldorf 1977. (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 164-171 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Progresses in the application of plastic compound materialsPlastics possess a number of various properties one cannot find in another material in this combination. Beyond that the desired properties can be reached by compounding several different materials. The best known example is the glass reinforced plastic. The arguments for the application of compound materials are very different: increase of strength and stiffness, cheaper injection moulded parts due to shorter cycle times, thinner wall-thicknesses and therefore less raw material consumption, lower distortion and thermal elongation for technical parts and excellent thermal insulation of the foams.Research on the topic of the bonding between the plastic and the carbon, glass and organic fibres led the way to an ever spreading field of the application of reinforced plastics.
    Notes: Kunststoffe weisen eine Reihe von Eigenschaften auf, die sich in diesen Kombinationen bei keinem anderen Werkstoff finden. Darüber hinaus können durch chemische oder mechanische Verbindungsvorgänge die gewünschten Eigenschaften mehrerer Materialien in einem Werkstoff vereinigt werden. Das bekannteste Beispiel für die mechanischen Verbundwerkstoffe auf Kunststoffbasis ist der glasfaserverstärkte Kunststoff. Die wesentlichen Argumente für den Einsatz von Verbundwerkstoffen sind ganz unterschiedlicher Art: Festigkeits- und Steifigkeitssteigerung, Fertigungskostensenkung durch kürzere Zykluszeiten für das Spritzgußverfahren, größere Formtreue bei Spritzgußteilen aus teilkristallinen Thermoplasten, geringere Wärmedehnung für Maschinenteile, bessere Wärmeisolation z. B. bei Schäumen, geringerer Verbrauch an Kunststoffen durch kleinere Bauteilwanddicken.Durch intensive Forschung und gute Fortschritte auf den Gebieten Haftung zwischen Faser und Kunststoff, Verarbeitbarkeit hochmoduliger Kohle- und Chemiefasern, Festigkeit, Temperatur- und Chemikalienbeständigkeit der Kunststoffe, Verarbeitungstechnologie für Spritzguß, Prepeg- und Naßverarbeitung hat sich der Anwendungsbereich der faserverstärkten Kunststoffe erheblich erweitert.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090506
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 97
    Electronic Resource
    Electronic Resource
    Tagungsbericht. Symposium: „Grundlagen und Praxis der Haftung beim Beschichten und Verbinden“ (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 180-181 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090509
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 98
    Electronic Resource
    Electronic Resource
    Titan und Titanlegierungen (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 181-188 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Seit 1949 hat die industrielle Herstellung von Titan ausgehend von den USA in Europa, Japan und den UdSSR zunehmende Bedeutung gewonnen. Heute zählt der Werkstoff mit einer Erzeugung an Schmelzblöcken von rd. 30 000 jato in der westlichen Welt zu den Konstruktionswerkstoffen, die in weiten Bereichen der Technik angewandt werden.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090510
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 99
    Electronic Resource
    Electronic Resource
    Weichmagnetische Werkstoffe- Grundlagen, Legierungen, Eigenschaften, Lieferformen, Anwendungen. Von Richard Boll. Vacuumschmelze GmbH., Hanau und Berlin. Dritte völlig überarbeitete und erweiterte Auflage, 1977. Eigenverlag. 348 Seiten, zahlreiche Bilder, zahlreiche Tabellen (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. 188-188 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090511
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 100
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1978)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 9 (1978), S. A54 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19780090703
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...