Library

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • 1970-1974  (1,151)
  • 1890-1899
  • 1971  (1,151)
  • Inorganic Chemistry  (788)
  • Industrial Chemistry  (330)
  • Electron microscopy  (33)
Material
Years
  • 1970-1974  (1,151)
  • 1890-1899
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 8 (1971), S. 165-171 
    ISSN: 1432-0827
    Keywords: Bone ; Ceramic ; Tetracycline ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Un implant céramique non poreux est testé au niveau du fémur de rat en ce qui concerne son adhésivité à l'os. Un certain nombre de techniques morphologiques sont utilisées pour examiner le rapport entre l'implant et l'os néoformé. La microscopie électronique par transmission et la microscopie par fluorescence après marquage à la tétracycline ont donné les meilleurs résultats. Un rapport étroit entre l'os minéralisé et la céramique a été noté en microscopie électronique. Par marquage à la tétracycline, il semble que l'implant puisse stimuler la formation osseuse.
    Abstract: Zusammenfassung Ein unporöses keramisches Implantat in Rattenfemora wurde auf seine Fähigkeit geprüft, sich mit Knochen zu binden. Eine Anzahl morphologischer Techniken wurde verwendet, um die Beziehung zwischen den Oberflächen von Implantat und neuem Knochen zu untersuchen. Transmissions-Elektronenmikroskopie und Fluoreszenzmikroskopie nach Tetracyclinmarkierung waren die erfolgreichsten Techniken. Eine enge Beziehung zwischen mineralisiertem Knochen und dem Keramikimplantat konnte mit der Transmissions-Elektronenmikroskopie nachgewiesen werden. Das Aussehen der Tetracyclinmarkierung im keramischen Implantat deutet darauf hin, daß dieses wahrscheinlich die Fähighkeit hat, Knochenbildung zu erhöhen.
    Notes: Abstract A nonporous ceramic implant in rat femora was evaluated as to its ability to bond to bone. A number of morphologic techniques were utilized to examine the interfacial relationship of the implant to new bone. Transmission electron microscopy and fluorescence microscopy after tetracycline labelling were the most successful techniques. An intimate relationship between mineralized bone and the ceramic was demonstrated by transmission electron microscopy. The appearance of tetracycline labelling at the ceramic interface indicates that the implant may have capacity to enhance bone formation.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 8 (1971), S. 287-303 
    ISSN: 1432-0827
    Keywords: Calcification ; Bone ; Matrix ; Apatite ; Nucleation ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Du collagène d'os compact de mouton est préparé par décalcification dans I'EDTA et à partir de tendons de queux de rats, par extraction dans l'acide acétique et reconstitution dans NaCl. Le dépôt d'apatite dans le collagène osseux de mouton dans une solution de calcification métastable est étudié chimiquement et par microscopie électronique. Le collagène osseux est un bon catalyseur de nucléation pour le dépôt minéral, alors que le collagène de tendons de rat ne l'est pas. Le dépôt minéral du collagène osseux se produit en deux phases cinétiques séparées, une phase rapide de nucléation et une croissance cristalline, donnant naissance à de petits ilots calcifiés et une seconde phase lente de croissance dans des régions ne comportant pas de zones catalytiques. La seconde phase de dépôt minéral paraît être le résultat d'une diffusion inhibée d'ions à travers les fibrilles collagènes alignées, laissant de larges régions de collagène sans minéral, bien que le tampon reste hautement sursaturé. La microscopie électronique permet de penser que les zones de catalyse pourraient avoir un rapport avec la périodicité de 640 Å de collagène, mais l'importance d'un matériel noncollagènique, lié au collagène, n'est pas à exclure. L'activité catalytique faible du collagène reconstitué n'est pas liée à la présence d'inhibiteurs faiblement liés, bien que des inhibiteurs puissent être intimement liés à ce type de collagène, qui pourrait être absent du collagène osseux. La différence d'activité catalytique pourrait intervenir dans la calcification physiologique. Une hypothèse plus générale pour la nucléation de la phase minérale dans les systémes biologiques est nécessaire.
    Abstract: Zusammenfassung Kollagen wurde aus kompaktem Schafsknochen mittels EDTA-Entkalkung und aus Rattenschwanzsehnen durch Essigsäureextraktion und Rekonstitution mit NaCl gewonnen. Die Apatitablagerung aus einer metastabilen Verkalkungslösung auf Schafsknochenkollagen wurde chemisch und im Elektronenmikroskop untersucht. Es zeigte sich, daß das Knochenkollagen ein guter Nukleationskatalysator für die Mineralablagerung ist, was beim Rattenschwanzkollagen nicht zutraf. Im Knochenkollagen erfolgte die Mineralablagerung in zwei getrennten kinetischen Phasen: einer raschen Phase der Nukleation und des Kristallwachstums, welche kleine verkalkte Inseln entstehen läßt, und einer zweiten langsamen Phase, welcher das Wachstum in Bezierken, die keine katalytischaktiven Stellen einschließen, zuzuschreiben ist. Diese zweite Phase der Mineralablagerung wird als Resultat einer verminderten Ionendiffusion durch die enganeinanderliegenden Kollagenfibrillen angesehen, wodurch weite Kollagenbereiche ohne Mineral bleiben, obwohl der Puffer stark übersättigt ist. Elektronenmikrographien ließen vermuten, daß die katalytischaktiven Stellen in einem gewissen Verhältnis zur 640 Å-Periodizität des Kollagens stehen; es konnte jedoch nicht ausgeschlossen werden, daß nicht-kollagenhaltiges Material, welches an Kollagen gebunden ist, ebenfalls eine Rolle spielt. Die schlechte katalytische Aktivität des rekonstituierten Kollagens konnte nicht auf die Anwesenheit von schwachgebundenen Hemmstoffen zurückgeführt werden, obwohl Inhibitoren stark an dieses Kollagen gebunden sein könnten, die jedoch im Knochenkollagen nicht vorhanden sind. Die Unterschiede in der katalytischen Aktivität können mit der physiologischen Verkalkung in Beziehung stehen. Eine allgemeinere Hypothese für die Nukleation einer Mineralphase in biologischen Systemen wäre erforderlich.
    Notes: Abstract Collagen was prepared from compact sheep bone by decalcification with EDTA and from rat tail tendons by acetic acid extraction and reconstitution with NaCl. The deposition of apatite in sheep bone collagen in a metastable calcification solution was studied chemically and by electron microscopy. The bone collagen was shown to be a good nucleation catalyst for mineral deposition, while rat tail collagen was a poor catalyst. Mineral deposition in bone collagen occured in two separate kinetic phases, a rapid phase of nucleation and crystal growth, giving rise to small calcified islands, and a second slow phase, ascribed to growth in regions not involving the catalytic sites. This second phase of mineral deposition is considered to be the result of impaired ion diffusion through the closely-aligned collagen fibrils, thus leaving large areas of the collagen free of mineral even though the buffer remains highly supersaturated. Electron micrographs suggested that the catalytic sites might be in some relationship to the 640 Å periodicity of collagen, but a role for non-collagenous material bound to the collagen has not been excluded. The poor catalytic activity of reconstituted collagen was not due to the presence of loosely-bound inhibitors, although inhibitors could be strongly bound to this type of collagen and be absent from bone collagen. The differences in catalytic activity may have a bearing on physiological calcification. A more general hypothesis for nucleation of a mineral phase in biological systems is required.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 12 (1971), S. 447-456 
    ISSN: 1432-1106
    Keywords: Electron microscopy ; Cerebellum ; Purkinje cells ; Diphenyl-hydantoin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Electron microscopic examination of Purkinje Cells was performed in sections from the cerebellum of three albino rats aged 4 1/2 month, intoxicated with diphenylhydantoin for 51 days. Three untreated albino rats served as controls. There were no difference between the substructure of the Purkinje cells from the two groups of animals. It was concluded that diphenylhydantoin in toxic but sublethal doses does not change the substructure of the Purkinje cells.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 12 (1971), S. 379-388 
    ISSN: 1432-1106
    Keywords: Electron microscopy ; Spinal cord ; Neurone ; Synapse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Quantitative electron microscopical observations have been made on the afferent synaptology of neurones in laminae V and VII of the cervical spinal cord of the cat. Both laminae contain large bouton-covered polydendritic neurones of the type seen in the brainstem reticular formation. Each lamina contains two other categories of neurone. One of these, in lamina V, is peculiar in having a very high proportion of afferent boutons filled with dense-core vesicles; similar neurones exist in lamina VII, but their presynaptic afferents do not contain unusual quantities of dense-core vesicles. The third type of neurone in laminae V and VII seems to be identical with an oligodendritic neurone type found in the brainstem reticular formation and parafascicular-centromedian complex.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Experimental brain research 13 (1971), S. 451-460 
    ISSN: 1432-1106
    Keywords: Psychotropic drugs ; Rabbit hippocampus ; Glycogen ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Following administration of psychotropic drugs, the brains of rabbits were examined by electron microscopy, with special references to glycogen granules in the hippocampus, and were compared with the normal materials. After seven days' intramuscular injections of chlorpromazine (15 mg/kg/day) or trifluoperazine (10 mg/kg/day), glycogen granules appeared diffusely in the perikaryal cytoplasm of the pyramidal cells and small nerve cells and in the myelinated nerve fibers, and were accumulated in the dendrites of pyramidal cells and in the astrocytic cytoplasm. Those animals showed neuroleptic symptomes and extrapyramidal ones throughout the period. The administration of the drugs might inhibit the glycolytic metabolism in neurons and glial cells of the hippocampus.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Clinical and experimental medicine 156 (1971), S. 268-282 
    ISSN: 1591-9528
    Keywords: Isolated rat kidney ; Na net transport ; Pluronic-F-108® ; Electron microscopy ; Oxygen deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Employing a non-ionic detergent as a colloidosmotically active substance 10 fully isolated rat kidneys were perfused for 60 min. A constant glomerular filtration rate (GFR) of 1.0 ml × g−1 × min−1 and a mean Na+-net transport of about 92 μmol × g−1 × min−1 was obtained. The mean O2-consumption of 0.17 ml × g−1 × min−1 was rather high. However, addition of the decoupling agent 2,4-dinitrophenol led to an increase of the O2-consumption by 98%, thus speaking against spontaneous uncoupling. Glomerula, proximal and distal convoluted tubules of kidneys perfused with plasmaexpander-solutions were studied electronmicroscopically. The most striking morphological deviations were found in the proximal tubules of the Haemaccel®-perfused kidneys. In the Pluronic®-kidneys significantly less morphological alterations were found. These morphological changes were of a type which was previously described by other investigators after periods of hypoxia.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 113 (1971), S. 553-557 
    ISSN: 1432-0878
    Keywords: Albino rat ; Striatal neurons ; Endoplasmic reticulum ; Dark cisternal fields ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Bei der elektronenmikroskopischen Untersuchung des Striatums einer Ratte wurden im Perikaryon einiger Neurone eigentümliche parallele Anordnungen von membranbegrenzten Zisternen gefunden, welche durch eine auffallend dichte cytoplasmatische Matrix voneinander getrennt waren. Ein mit dieser Beobachtung völlig übereinstimmender Befund ist unlängst von anderer Seite an Nervenzellen des Nucleus entopeduncularis und der orbitofrontalen Großhirnrinde der Katze erhoben worden. Bei den „dunklen Zisternenfeldern“ dürfte es sich um Bereiche des endoplasmatischen Retikulums handeln, die sich in einem besonderen Funktionszustand befinden. Sie kommen wahrscheinlich schon normalerweise bei verschiedenen Tierarten in bestimmten Regionen des ZNS vor.
    Notes: Summary The electron microscopic study of a rat's striatum has revealed peculiar parallel arrays of membrane-bound cisternae with a strikingly dense intercisternal cytoplasmic matrix in the perikarya of a few neurons. The finding corresponds exactly to the unique lamellar configurations recently described in nerve cells of the entopeduncular nucleus and orbitofrontal cortex of the cat. These “dark cisternal fields” are regarded as distinct districts of the endoplasmic reticulum in a special functional state. They seem to occur normally in certain regions of the CNS in different animal species.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 114 (1971), S. 271-280 
    ISSN: 1432-0878
    Keywords: Thymus ; Rat ; Involution ; Reticulum-Cells ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 1. Entodermale Thymus-Retikulumzellen neugeborener Wistar-Ratten enthalten häufig helle Vesikel mit enger räumlicher Beziehung zum Golgi-Apparat. Bei 13 Monate alten Ratten fehlen diese Vesikel. 2. Die Tatsache, daß die Häufigkeit heller Vesikel mit fortschreitendem Lebensalter abnimmt, findet ihre Parallele in der von anderer Seite getroffenen Feststellung, daß die Bildung eines humoralen Faktors im Thymus im Laufe der Zeit eingeschränkt wird. 3. Diese Koinzidenz läßt an die Möglichkeit denken, die hellen Vesikel könnten ein morphologisches Äquivalent der Bildung eines Thymuswirkstoffes sein. 4. In entodermalen Thymus-Retikulumzellen 13 Monate alter Ratten finden sich große Vakuolen mit granulärem Inhalt. Ihre Bildung beginnt schon vor der Thymusinvolution. Sie entstehen wahrscheinlich durch Phagozytose oder Aufnahme zelleigenen Materials, das nicht weiter abbaufähig ist. 5. Da diese Einschlüsse mit fortgesetzem Alter an Zahl und Größe zunehmen, scheinen sie als Ausdruck einer Beeinträchtigung der Stoffwechselvorgänge im Zytoplasma ein erstes morphologisch faßbares Symptom der frühzeitigen physiologischen Involution des Thymus zu sein.
    Notes: Summary 1. Entodermal reticulum cells of new born Wistar rats frequently contain clear vesicles with close connection to the Golgifield. These vesicles do not occur in reticulum cells of 13 months old rats. 2. The frequency of these clear vesicles decreases with advancing age obviously in the same way as the production of a humoral thymic factor reported by several investigators. 3. This observation agrees with the hypothesis that the clear vesicles are the morphological equivalent of the production of a humoral thymus factor. 4. Entodermal reticulum cells of 13 months old Wistar rats contain large vacuoles filled with electron dense, granulated materials. The formation of these vacuoles starts already before the beginning of the thymus involution. Possibly they are produced by phagocytosis or necrobiosis and contain deposits of material that cannot undergo further degradation. 5. The increase of these vacuoles in number and size with advancing age may be considered as equivalent of the deterioration of metabolism responsible for early involution of the thymus.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 114 (1971), S. 301-308 
    ISSN: 1432-0878
    Keywords: Freeze Fracture ; Microvasculature (chick) ; Ground substance ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Tissues of the young chick and chick embryo were prepared in a relatively unaltered condition by the freeze-fracture technique. The ultrastructure of the microvasculature and surrounding interstitial region is compared with that seen in conventional thin-sectioned material. In the undifferentiated vessels of the 3-day chick embryo, no distinct basement lamina can be distinguished in either type of preparation. In the 3-week chick, a continuous basement lamina is present beneath the endothelium only in chemically fixed and sectioned tissue; it cannot be distinguished from the remaining interstitial substance in freeze-fracture preparations. Blood-tissue exchange may depend on permeability characteristics of the entire interstitial region rather than on the basement lamina alone.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 115 (1971), S. 1-16 
    ISSN: 1432-0878
    Keywords: Iris ; Rabbit ; Pinocytosis ; Enzymes ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary On the basis of the occurrence, at the light microscopic level, of alkaline and acid phosphatases, the pigment epithelium covering the posterior surface of the iris in the albino rabbit can be divided into two zones not previously described, viz. a central zone close to the pupil, approximately corresponding to the area occupied by the iridic sphincter muscle, and a peripheral zone extending to the ciliary body. The central zone which is in intimate relation with the lens was found to have a high content of both phosphatases. At the fine structural level it exhibits a marked pinocytotic activity in the epithelium at the interdigitations between adjacent cells. Electron microscopy revealed that acid phosphatase is localized to the walls of the pinocytotic vesicles. Alkaline phosphatase is in evidence at the surface membrane folds and at microvillous processes between the epithelial cells and the adjoining muscle cells. Unlike the distribution of the acid phosphatase, that of the alkaline phosphatase does not differ fundamentally in the two zones at the fine structural level. In a series of dehydrogenases studied, staining with a view to succinic-, isocitric- and glucose-6-phosphate dehydrogenases revealed an evenly distributed content of enzyme throughout the epithelium. As to the lactic- and β-hydroxybutyric dehydrogenases, contents seem to be lower in the pupillary than in the peripheral zone.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 116 (1971), S. 136-150 
    ISSN: 1432-0878
    Keywords: Adrenal cortex ; Rat ; Sex difference ; ACTH ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Nebennierenrinde von 178 Sprague-Dawley-Ratten wurde elektronenmikroskopisch von der 1.–12. Lebenswoche unter Normalbedingungen sowie nach s.c. Injektion von 3 IE ACTH/100 g Körpergewicht innerhalb von 2 min — 24 Std untersucht. Ab der 5. Lebenswoche unterscheiden sich die Nebennieren von Weibchen im Bereich der äußeren Zona fasciculata durch Kernvergrößerung, größere Mitochondrien und kleindisperse Liposomen von denen der Männchen. Zyklusbedingte Schwankungen in der Ultrastruktur der weiblichen Nebennierenrinde bestehen nicht. Nach ACTH-Applikation nähert sich das Nebennierenbild des Männchen innerhalb von 30 min dem des unbehandelten Weibchens. Außerdem kommt es bei beiden Geschlechtern durch ACTH zu einer Dispersion und Reduktion der Liposomen, Vergrößerung des Golgiapparates und der Zellkerne, Ausweitung des endoplasmatischen Retikulums und Vermehrung der Mikrovilli. Der Geschlechtsdimorphismus wird funktionell erklärt.
    Notes: Summary 178 Sprague-Dawley-rats were studied by electron microscopy from the 1st to the 12th week of life under normal conditions and after s. c. injection of 3 I. U. ACTH/100 gbodyweight from 2 min to 24 hours. Beginning with the 5th week of life females differ from males by small dispersed liposomes and enlarged nuclei and mitochondria in the outer z. fasciculata. There is no change in the ultrastructure of the female adrenal cortex depending on the sexual cycle. After application of ACTH the adrenal cortex of males assimilates to the untreated females within 30 min. After ACTH-application both sexes show dispersion and reduction of liposomes, dilation of endoplasmatic reticulum, increasement of microvilli and enlargement of the Golgi apparatus. The sex-dimorphism is interpreted by functional differences.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 118 (1971), S. 97-112 
    ISSN: 1432-0878
    Keywords: Stratum corneum ; Man ; Non-fixed ; Non-dehydrated ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary This is an electron microscopic study of non-fixed and non-dehydrated normal human stratum corneum from the lumbar region. Non-stained sections have a low contrast. In sections examined 3 days after skin biopsy the cytoplasm of the cells shows a uniform contrast or exhibits dark and light areas. A single layer delimits the cytoplasm from the intercellular space. The latter is partly filled out with substance. In sections stained 2 to 4 days after skin biopsy the fibrils are distinct. On the basis of the variations in their opacity and ultrastructure three types of horny cells are clearly distinguishable. In cells of type 1 intensely stained keratohyalin and less opaque fibrillar substance occur. A distinct keratin pattern is not found. In cells of type 2 the fibrils show areas with distinct kerytohyalin and keratin pattern and transitional phases between these two stages of fibrillar differentiation. The keratin pattern representing the final stage of the fibrillar differentiation process is visualized through a successive “discoloration” of the filaments, whereas the interfilamentous substance retains the opacity of the keratohyalin. In cells of type 3 the entire fibrillar substance exhibits a keratin pattern. This consists of less opaque filaments with a diameter of 74 Å. The septa representing the interfilamentous substance are estimated as 30 Å at their thinnest points. These observations of the fibrils are completely comparable to the findings in fixed and dehydrated normal human stratum corneum. In sections stained particularly more than 18 days after skin biopsy the fibrils exhibit pronounced changes in their staining properties with concomitant decrease in distinctness or a complete extinction of the keratin pattern. The observations of the modified plasma membrane and the intercellular space in stained sections correspond to the findings in fixed and dehydrated normal human stratum corneum. The modified plasma membrane and the structures in the intercellular space appear with equal distinctness, whether the sections are stained 2 to 4, 6 to 12 or 14 to 21 days after skin biopsy.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 117 (1971), S. 576-596 
    ISSN: 1432-0878
    Keywords: Median eye ; Frontal organs ; Crustacea ; Anostraca ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Das Mittelauge (MA) und das ventrale Frontalorgan (FO) von Artemia salina L. (erwachsene Tiere) wurden elektronenmikroskopisch untersucht. 1. Das MA ist ein inverses Becherauge. Ein Pigmentbecher aus zwei Pigmentzellen umschließt drei Sehzellgruppen. Die Sehzellen bilden verzweigte Rhabdome vom geschlossenen Typ. Ihr Zytoplasma enthält zahlreiche Vesikel, tubuläre Mitochondrien, kleine Golgiapparate, Mikrotubuli, variable multivesicular und lamellated bodies und Lipideinschlüsse, die von endoplasmatischem Retikulum spiralig umgeben werden. 2. Die Pigmentzellen enthalten dicht gepackte Pigmentkörner, einen gelappten Kern, Mitochondrien vom Cristatyp, wenig endoplasmatisches Retikulum, Mikrotubuli, lamellated und vesicular bodies. Gegenüber den rhahdombildenden Anteilen der Sehzellen ist ihre Zelloberfläche glatt, im übrigen bilden sie lange fingerförmige Ausstülpungen. 3. Artemia salina besitzt zwei Arten von Frontalorganen. Die „dorsalen PO“ sind möglicherweise neurosekretorische X-Organe. Das ventrale FO wird als Sehorgan gedeutet. Es besteht aus zwei Gruppen von Sehzellen ventral vom MA, die eigene Nervenfortsätze zum Protocerebrum senden. Die optische Achse ist der des ventralen Augenbechers entgegengesetzt. Zwischen MA und FO verläuft ein Nerv, der wahrscheinlich dem MA angehört. 4. Übereinstimmungen der Feinstruktur von MA, FO und den Retinulazellen der Komplexaugen betreffen insbesondere die Binnenstruktur der Rhabdommikrovilli und Äquivalente unterschiedlicher Funktionszustände (Hell-Dunkel-Adaptation) hinsichtlich der Ausbildung von perirhabdomalen Vakuolen und des Ausmaßes von pinocytotischen Vorgängen an der Basis der Rhabdome.
    Notes: Summary The median eye (MA) and the ventral frontal organ (FO) of Artemia salina L. (adult specimens) have been investigated with the electron microscope. 1. The MA is an inverse cup-shaped eye. A pigment cup, consisting of two pigment cells, surrounds three groups of photosensory cells, which form ramified rhabdoms of the closed type. Their cytoplasm contains numerous vesicles, tubular mitochondria, small Golgi fields, microtubules, variable multivesicular and lamellated bodies and lipid inclusions, which are surrounded by spirals of endoplasmic reticulum. 2. The pigment cells contain densely packed pigment granules, an indented nucleus, crested mitochondria, small amounts of endoplasmic reticulum, microtubules, lamellated and vesicular bodies. Opposite the rhabdomeric surface of the visual cells their cellular surface is smooth, otherwise it bears long fingershaped projections. 3. Artemia salina possesses two types of frontal organs. The “dorsal FOs” are possibly neurosecretory X-organs. The ventral FO is interpreted to represent a photosensory organ. It consists of two groups of sensory cells located ventrally of the MA, which possess own nerve-processes leading to the Protocerebrum. Their optical axis is opposite the one of the ventral eye cup. Between MA and FO a nerve occurs, which presumably belongs to the MA. 4. Considerable finestructural similarities between MA, PO and the retinula cells of the compound eyes exist as far as the internal structure of the rhabdomeric microvilli and the equivalents of different functional stages (Light-Dark-Adaption) are concerned, namely perirhabdomeric vacuoles and the degree of pinocytotic processes at the base of the rhabdoms.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 118 (1971), S. 467-481 
    ISSN: 1432-0878
    Keywords: Neutrophilic promyelocyte ; Human bone marrow ; Primary granulogenesis ; Phase contrast microscopy ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The developmental changes in the neutrophilic promyelocytes from normal human bone marrow have been analyzed by means of phase contrast and electron microscopy. This developmental phase is characterized by the elaboration of primary (azurophillysosomal) granules and the entire intracellular machinery is directed principally toward this goal. The promyelocyte stage has been subdivided into three arbitrary stages based upon morphological, histochemical and functional characteristics which relate to the onset, active production and cessation of primary granulogenesis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 119 (1971), S. 1-20 
    ISSN: 1432-0878
    Keywords: Human testis ; Gonocyte ; Spermatogonium ; Germ cell degeneration ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron-microscopic examination of the human fetal testis between 10 and 20 weeks gestation reveals the presence of two distinct cell types within the tubules: Sertoli cells and germ cells. The latter are distinguished by their spherical shape, smooth nuclear membranes, globular mitochondria and paucity of cytoplasmic organelles. The gonocytes, or primitive germ cells, occur as single cells in the central portions of the tubules. Their chromatin is finely granular and evenly dispersed. Nucleoli are centrally placed and of uniform electron density. Various stages in the migration of gonocytes to the tubular periphery are indicated by the extension of cytoplasmic processes toward the basal lamina. Bands of microtubules are present within the processes. Spermatogonia are arranged in pairs and groups at the tubular periphery. They lack the nucleolar and mitochondrial characteristics of adult spermatogonia. Except for slight changes in chromatin density and nucleolar structure, the fetal spermatogonia retain the ultrastructural characteristics of gonocytes. Intercellular bridges connect adjacent spermatogonia. Degeneration affecting large numbers of germ cells, but primarily gonocytes, begins with nuclear infolding and chromatin condensation and eventually involves both nuclear and cytoplasmic structures. The degenerated cells are removed by phagocytosis by adjacent Sertoli cells. Large phagosomes are present in the cytoplasm of many of the Sertoli cells.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 119 (1971), S. 483-514 
    ISSN: 1432-0878
    Keywords: Hermaphroditic Gonad ; Gastropoda ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung In den Spitzenbereichen der Zwittergonadenacini fertiler Tiere der Pulmonatenspezies Planorbarius corneus sind drei Zelltypen stets gleichzeitig anzutreffen: Oocyten, Spermatiden und Begleitzellen. Die Abgrenzung der Acinusspitze gegen das interacinäre Gewebe hin bildet die Basalmembran des wandständigen Begleitzellepithels. Die Oocyten werden follikelartig von den ineinander verzahnten und durch Desmosomen verknüpften Begleitzellen umgeben. Nur in der Acinuskuppe liegen sie der hier stark verdickten Basalmembran unmittelbar auf. Die Spermatiden sitzen nur mit ihrem anterioren Zellpol den Begleitzellen apikal auf und sind durch Desmosomen mit ihnen verknüpft. Veränderungen der Ultrastruktur der Spermatiden während der Spermiohistogenese werden an drei gegeneinander abgrenzbaren Spermiohistogenesestadien aufgezeigt. Dabei finden die Kernstruktur, das Auftreten von Tubulikörpern und das Abstreifen des Restplasmas vom Mittelstück besondere Beachtung. Den recht uneinheitlich strukturierten Begleitzellen kommen für Oocyten und Spermatiden Ernährungs- und Transportfunktionen zu. Sie phagocytieren überfällige Geschlechtszellen. Es können jedoch trotz ihrer heteromorphen Struktur keine prinzipiell verschiedenen Begleitzelltypen mit jeweils nur einer spezifischen Funktion unterschieden werden. Das in früheren lichtmikroskopischen Arbeiten als Begleitzellprodukt beschriebene „Kinoplasma“ erweist sich als kernwärts wanderndes Restplasma der Spermatiden.
    Notes: Summary Three species of cells always coexist in the tips of hermaphroditic gonad-acini of fertile Planorbarius corneus: oocytes, spermatids and auxiliary cells. The basement membrane of the auxiliary cell epithelium separates the acinus tips from the interacinary tissue. Like follicles the oocytes are enclosed by interlocked and desmosomically attached auxiliary cells. Only in the utmost tips of the acinus the oocytes are in direct contact with the here dilated basement membrane. The spermatids are attached to the auxiliary cells only with their anterior cell-pole and connected with these by desmosomes. Alterations of the spermatid-ultrastructure during the spermiohistogenesis can be studied in three separate stages of the spermiohistogenesis. Particular attention is given to the nuclear structure, the tubular bodies and the shedding of residual plasma from the middle-piece. The rather irregularly structured cells serve oocytes and spermatids as mediators for nutrition and transport. Occasionally occurs phagocytosis of germ-cells. Basically, even though their structures vary, auxiliary cells are not restricted to one specific function. The “Kinoplasma”-described in previous light microscopic studies as a product of the auxiliary cells, proves to be spermatidic residual plasma moving towards the nucleus.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 120 (1971), S. 401-419 
    ISSN: 1432-0878
    Keywords: Nervous System ; Carcinus maenas ; Cerebral ganglion ; Intracerebral capillaries ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The structure of the cerebral ganglion of the shore crab, Carcinus maenas, is investigated by conventional electron miscroscope techniques, with particular emphasis on the relation of intracerebral blood vessels to other elements in the brain. The ganglion is permeated by a continuous network of channels which may be interpreted as invaginations of the ganglion surface. The afferent vessel (cerebral artery) is of mesodermal origin, but apparently terminates as an open-ended vessel soon after entering the brain, where it runs within the invaginated channels. The greater part of the cerebral vasculature, therefore, has no mesodermal endothelial lining. Tissue components in the diffusion path between blood and brain which could conceivably restrict diffusion, are the thick glial basement membrane, junctions between perivascular and between interstitial glia, and polymeric material in the extracellular space. However, apart from a barrier to large colloidal particles at the basement membrane, the present EM observations do not decisively pinpoint sites of diffusional restriction, nor can they be interpreted as evidence that such restriction exists.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 122 (1971), S. 1-14 
    ISSN: 1432-0878
    Keywords: Amnion ; Human amniotic plaques ; Fetal membranes ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of amniotic and amniotic-plaque epithelia has been studied from normal term pregnancies. The columnar/cuboidal amniotic epithelial cells usually have apical or central nuclei, some free ribosomes, patches of granular endoplasmic reticulum, juxtanuclear Golgi complexes, rod-shaped mitochondria, lipid droplets and some glycogen granules. They have short, blunt microvilli which frequently branch and bathe in the amniotic fluid. The lateral plasma membranes enclose tortuous intercellular spaces which are always interrupted by variously folded processes and desmosomes. The epithelial cells rest on a basal lamina and exhibit highly folded basal processes. The amniotic epithelial cells are neither distinctly Golgi and fibrillar types nor “light” and “dark” in appearance. Amnion from near the umbilical cord contains many microscopic and several large plaques. Similar structures are not found on the reflected amnion. The microscopic plaques are whitish and translucent, whereas the large ones are opaque. The large plaques vary between 1–3 mm in diameter, and are over 15 cell layers thick. Each large plaque has a main central region and edges continuous with either the microscopic plaque or the simple amniotic epithelium. The main region shows four zones, namely, stratum basale, stratum spinosum, stratum granulosum and stratum corneum. Such zones are not distinct at the edges. The fine structure of basal cells compares with the amniotic epithelial cells, but the cells of spinosum and granulosum layers possess variable amounts of tonofibrils, keratohyalin granules, free ribosomes and other cytoplasmic organelles and inclusions. The corneum cells are keratinized and are frequently separated by intercellular spaces. They slough into the amniotic cavity singly or as a sheet, and contribute towards the composition of the amniotic fluid. The plaques are of amniotic origin, and are not formed by adhesion of either squamous cells or fetal skin cells (masses of keratinized squames). The present observations suggest that the occurrence of amniotic plaques is normal. The presence of plaques may not be necessarily associated with fetal abnormality. However, increase in numbers of plaques may be caused by conditions of fluid imbalance. The homology and significance of plaques in eutherian mammals have been discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 113 (1971), S. 558-563 
    ISSN: 1432-0878
    Keywords: Pterin layer ; Pigmentation ; Dermis ; Development ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure of the pterin layer was investigated in both wild type Rana pipiens and Rana pipiens homozygous for the speckle mutant gene. No difference in morphology of the layer was noted between the wild type and mutant. The layer lines the outer surface of the stratum compactum of the dermis and separates this stratum from the stratum spongiosum. The pterin layer consists of extra-cellular material and contains membrane-bounded granules filled with fine spicules. Many of the spicules are somewhat similar in appearance to the initial calcification loci present in developing membrane bone. The layer first appears in the tadpole at approximately stage 14 (Taylor and Kollros, 1946); subsequent developmental stages are described.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 115 (1971), S. 396-415 
    ISSN: 1432-0878
    Keywords: Human pineal organ ; Development ; Innervation ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary This investigation is concerned with pineal organs of human embryos 60 to 150 days old. At every stage central nerve fibres enter the pineal organ by way of the habenular commissure, but are restricted to the pineal's proximal part. On about the 60th day of the development the sympathetic nervus conarii grows into the distal pole of the pineal organ from a dorso-caudal direction and plays the predominant part in the innervation of the pineal organ. After penetrating, it soon branches out and forms a network in the pineal tissue. Much later, not until the 5th embryonic month, sympathetic nerves appear accompanying the supplying vessels in the perivascular spaces. After a short time these nerves pierce the outer limiting basement membrane and penetrate the parenchyma. Towards the end of the 5th embryonic month the axons of the sympathetic nerves form varicosities containing clear and dense core vesicles. At this point large amounts of laminated granules appear primarily in cell processes, probably of pinealocytes. Isolated granules also occur in the varicosities of axons. The granules encountered here are most likely secretory granules.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 21
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 115 (1971), S. 565-578 
    ISSN: 1432-0878
    Keywords: Testis ; Reptiles ; Sertoli cells ; Glycogen ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les cellules de Sertoli du testicule de Lacerta vivipara ont été étudiées en microscopie électronique chez des animaux récoltés entre le printemps et l'automne pendant deux années et chez des animaux hypophysectomisés en automne. Ces cellules contiennent de nombreuses mitochondries de petite taille à crêtes lamellaires, des ribosomes libres, un reticulum endoplasmique lisse moyennement développé, plusieurs petits dictyosomes formant l'appareil de Golgi, des liposomes et des microtubules. Elles renferment aussi de nombreux corps denses de grande taille qui paraissent être de nature lysosomiale. Le glycogène a été particulièrement étudié. Il est formé de particules β dispersées au hasard dans le hyaloplasme. Des variations saisonnières dans la teneur en glycogène ont été notées. Chez les hypophysectomisés, les cellules de Sertoli contiennent de grandes quantités de ce métabolite dont les particules sont concentrées dans des petites plages, souvent autour des liposomes. Les rôles possibles des cellules de Sertoli sont discutés: soutien et apport de nourriture aux cellules germinales, production d'hormones et phagocytose des corps résiduels. Les variations de la teneur en glycogène sont également discutées.
    Notes: Summary Sertoli cells of the testis of Lacerta vivipara have been studied electron microscopically in animals obtained between spring and autumn during two years and in animals hypophysectomized in autumn. These cells contain numerous small mitochondria with lamellar cristae, free ribosomes, smooth endoplasmic reticulum moderately developed, several small dictyosomes forming the Golgi complex, lipid droplets and microtubules. There are numerous dense bodies of large size with an heterogeneous content which seem to be of lysosomial nature. Glycogen consists of β particles dispersed at random in the hyaloplasm. Seasonal variations in the content of glycogen are noted. In hypophysectomized animals Sertoli cells contain large amounts of that metabolite whose particles are concentrated in small areas often around the lipid droplets. Possible role of the Sertoli cells concerning mechanical support and nutrition of the germinal cells, production of hormones and phagocytosis of residual bodies are discussed. The variations in the glycogen content are also discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 22
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 117 (1971), S. 394-418 
    ISSN: 1432-0878
    Keywords: Portal Vein ; Innervation ; Histochemistry ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die V. portae der weißen Ratte wurde licht-, fluoreszenz- und elektronenmikroskopisch auf ihre Innervation untersucht. 1. Paraldehydbedampfte Venenpräparate und Häutchenpräparate der gesamten Wandung (Falcksche Fluoreszenzmethode) lassen einen überwiegend längsorientierten äuβeren Nervenplexus erkennen, der den äußersten Muskelzellen aufliegt. Er ist leberseitig weitmaschig, darmseitig sehr engmaschig. Ein subendothelial gelegener innerer Plexus ist vorwiegend zirkulär orientiert. Er entspringt dem äußeren Plexus der darmseitigen Gefäßpartien. 2. Der Nachweis der Acethylcholinesterase (Gomori-Methode) bringt lichtmikroskopisch einige Nervenbündel in der bindegewebigen Adventitia zur Darstellung. Im übrigen findet sich die Aktivität des Enzyms nur in den interzellulären Spalten der Muskelschicht. Der elektronenmikroskopische Nachweis der Acethylcholinesterase (Karnovsky-Methode) läßt aber erkennen, daß sich die Enzymaktivität auf die Muskelzellmembranen beschränkt. 3. Die elektronenmikroskopische Untersuchung bestätigt den fluoreszenzmikroskopischen Befund. a) Lebernah finden sich nur vereinzelte Axonbündel, die der äußeren Muskellage aufgelagert sind. Die Einzelaxone sind vollständig von den Schwannschen Zellen umgeben. Nur wenige, den Muskelzellen benachbarte Axone enthalten agranuläre Vesikel. Sehr selten sind Ausfaltungen der vesikelhaltigen Axone zu sehen, deren Abstand zur Muskelzelle aber immer noch 1000–2000 Å beträgt. b) Auf über eintausend Dünnschnitten wurde kein Axon innerhalb der dicken Muskelschicht gefunden. c) Subendothelial verlaufende Axone (innerer Plexus) sind teilweise oder völlig aus den Schwannschen Zellen ausgefaltet. Sie sind dicht besetzt mit leeren Vesikeln (300–650 Å) und enthalten wenige kernhaltige Vesikel in der Größenordnung 800–1600 Å. Synaptische Endigungen werden nicht beobachtet. d) Eine dichte Häufung vesikelhaltiger Axone, die teils völlig, teils nur an der muskelzellnahen Seite aus den Schwannschen Zellen ausgefaltet sind, finden sich am Übergang der V. mesenterica superior zum Pfortaderstamm, deren einschichtiger Muskellage angelagert. Von diesen Bündeln stammende kleinere Bündel und Einzelaxone ziehen zwischen den Muskelzellen hindurch und erreichen das Endothel. Typische Synapsen werden nicht beobachtet. Kein vesikelhaltiges Axon nähert sich mehr als 1000 Å den Muskelzellen. 4. Die ausgefalteten vesikelbesetzten Axone werden als vegetative Überträgerstrecken angesehen. Die Erregung der Effektorstrukturen durch Transmittersubstanzen wird im Zusammenhang mit der postmortalen autonomen Gefäßkontraktilität diskutiert.
    Notes: Summary The innervation of the portal vein of the white rat was examined with light-, fluorescence-, and electronmicroscopic techniques. The results are as follows: 1. Paraldehyde treated vein preparations (Falck's fluorescence method) demonstrate a predominantly longitudinally orientated external nerve plexus, being situated on the outermost muscle cells. Near the liver the nerve net is characterized by broad meshes, near the intestinal tract by narrow ones. The circular subendothelial inner plexus originates in the outer plexus of the intestinal vascular bed. 2. Nerve bundles in the fibrous adventitia were demonstrated with Gomori's Acethylcholinesterase method. In other respects, the enzyme activity was only observed in the intercellular spaces of the muscle layer. The electronmicroscopic demonstration of Acetylcholinesterase (Karnovsky's method) further showed that the enzyme activity is restricted to the muscle cell membrane. 3. The electronmicroscopic examination verified the results obtained with fluorescence microscopic techniques. a) In the proximity of the liver, only isolated nerve bundles occur on the outer muscle layer. The individual nerves are entirely surrounded by Schwann cells. Only a few of the axons in the vicinity to the muscle cell have agranular vesicles. Evaginations of the vesicular axons occur infrequently. Their distance from the muscle cell amounts to 1000–2000 Å. b) In more than one thousand thin sections, no axons were found inside the thick muscular layer. c) Subendothelial axons (inner plexus) are either partially or totally evaginated from the Schwann cells. They are densely filled with empty vesicles (350–650 Å) and contain a few dense core vesicles of 800–1600 Å in diameter. Synaptic endings were not observed. d) A dense collection of vesicle-containing axons, that were partially in their entirety and partially only from the muscle cell proximal side evaginated from the Schwann cells, were observed in the single muscle layer at the junction of the superior mesenteric and the portal vein. From these bundles, smaller bundles and individual axons pass between the muscle cells and reach the endothelium. Typical synapses were not observed. No vesiclecontaining axon was nearer than 1000 Å to the muscle cell. 4. Those axons possessing vesicles and being evaginated are considered to be vegetative conducting pathways. The excitation of the effector structures by transmitter substances is discussed in connection with the post mortem autonomic vascular contractility.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 23
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 117 (1971), S. 463-475 
    ISSN: 1432-0878
    Keywords: Bone marrow ; Leukocytes ; Electron microscopy ; Histochemistry ; Peroxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructural localization of peroxidase activity has been studied in the cells of normal human bone marrow using the diaminobenzidine peroxidase technique. Peroxidase activity has been localized within the primary (azurophil) granules of the neutrophilic series as well as in the cytoplasmic granules of eosinophils, basophils and monocytes. Peroxidase activity appears within the cisternal system (nuclear envelope, Golgi complex and rough endoplasmic reticulum) of these cells during the period of peroxidase-containing lysosome production. With the cessation of granulogenesis, peroxidase activity disappears from the cisternal system and does not reappear in subsequent developmental stages. In cells incubated in peroxide-free media, staining of granular components, but not of cisternae, is reduced. The inclusion of catalase in peroxide-free media eliminates all staining. This indicates that an endogenous peroxide is present within the cisternae and granules of these cell types.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 24
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 117 (1971), S. 516-525 
    ISSN: 1432-0878
    Keywords: Liver ; Chicken ; Prenatal development ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the developing chicken liver has been reexamined on specimens fixed by perfusion with glutaraldehyde. This fixation technique gives a preservation of ultrastructural detail superior to that of earlier investigations. Among others the following observations may be pointed out: 1. Bile canaliculi with well-developed microvilli and adjacent tight junctions are present already at the 4-day-old stage and then remain essentially unchanged during development. 2. A subendothelial space of Disse is not present until about 16 days of incubation. 3. The Golgi apparatus does not assume its adult appearance until about 8 days of incubation. 4. Glycogen is first observed in the 6-day-old specimens and then continuously increases throughout development. Glycogen particles often accumulate in membranelimited bodies reminding of the glycogen-filled lysosomes found in a certain type of glycogenosis (Pompe's disease). 5. The mitochondria increase in size and number during development with a conspicuous change from rounded towards more rodshaped and elongated forms.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 25
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 119 (1971), S. 120-146 
    ISSN: 1432-0878
    Keywords: Red muscle ; Fibre types ; Small mammals ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Fasern des roten und langsamen M. soleus von Ratte, Kaninchen und Katze und des roten, jedoch schnellen, M. vocalis des Kaninchens wurden licht- und elektronenmikroskopisch untersucht und mit den verschiedenen Fasertypen aus dem M. tibialis anterior der Ratte und dem M. gastrocnemius des Kaninchens und der Katze verglichen. M. soleus und M. vocalis (einschließlich M. thyreoarytenoideus) enthalten nur einen mitochondrienreichen Fasertyp. Im schnellen M. vocalis ist der Z-Streifen schmal (50–60 nm), das sarcoplasmatische Reticulum ist gut entwickelt. Die Anordnung von Reticulum und Mitochondrion ist ähnlich wie in Herzmuskelzellen. Wie auch in anderen langsamen Muskeln verschiedener Tiere ist im M. soleus der Z-Streifen breit (100–120 nm), Triaden und Reticulum sind selten, und die Filamente bilden unregelmäßige Areale anstelle von Fibrillen. Hierin gleichen die Fasern des M. soleus den (mitochondrienreichen) C-Fasern eines entsprechenden gemischten Muskels; dagegen zeigen die Zwischentyp-(B-)Fasern schmale Z-Linien (50–70 nm), isodiametrische Fibrillen und mehr Triaden als die C-Fasern. Entgegen der bisherigen Vermutung, die auf der histochemischen Zuordnung der SoleusFasern zum Typ B und der Vocalis-Fasern zum Typ C beruht, ist daher anzunehmen, daß die langsamen motorischen Einheiten eines gemischten Muskels aus C- und nicht aus B-Fasern bestehen. In einigen Muskeln sind die Sarcomere der C-Fasern länger als die der B-(und A-) Fasern. Im M. tibialis anterior der Ratte verschwindet der Unterschied von 8,5% bei 2,6 μm Sarcomerlänge bei der Dehnung auf 2,8 μm mittlere Sarcomerlänge; vermutlich weil die Ruhedehnungskurve zunehmend steiler wird. Die isometrische Extraspannung im Tetanus ist bei 120% der Ruhelänge, d.h. bei 2,7 μm Sarcomerlänge. am größten. Daher muß bei 2,6 μm mittlerer Sarcomerlänge die Kraft der C-Fasern die der B-Fasern übertreffen. Rote Muskeln sind besser vaskularisiert als weiße Muskeln. Für die Mm. soleus und gastrocnemius der Katze verhalten sich die Kapillardichten (Kapillaren/mm2 Muskelfaserquerschnitt) wie 2,7∶:1. Dieser Wert entspricht dem Verhältnis zwischen den Größen für die Durchblutung (ml/min × 100 g) in Ruhe und bei maximaler Gefäßerweiterung.
    Notes: Summary Muscle fibres of the red and slow contracting soleus of rat, rabbit and cat and of the red however fast contracting thyreoarytenoid of rabbit are compared with different fibre types in the anterior tibial muscle of rat and in the gastrocnemius of rabbit and cat. With respect to fibre types soleus and thyreoarytenoid (including m. vocalis) are homogeneous and both being rich in mitochondria. The fast thyreoarytenoid shows a narrow Z-line (50–60 nm) and a well developed sarcoplasmic reticulum. The pattern of reticulum and mitochondria resembles more that of heart muscle cells than of skeletal muscle fibres. Like many slow contracting muscles of different animals the soleus fibres display a wide Z-line (100–120 nm), few triads, little reticulum and irregularly shaped areas of myofilaments instead of fibrils. In that soleus fibres equal fibres of type C (rich in mitochondria) in a corresponding heterogeneous muscle, whereas intermediate (type B) fibres reveal narrow Z-lines (50–70 nm), isodiametrically shaped myofibrils and more triads than C-fibres. Therefore it is far more likely that the slow motor units of a mixed muscle consist of C-fibres than of B-fibres. This is at variance with the histochemical designation of soleus fibres as type B and thyreoarytenoid fibres as type C. In some muscles in C-fibres the sarcomeres are longer than in B-(and A-)fibres. In the anterior tibial muscle of rat this difference is 8.5% at a mean sarcomere length of 2.6 μm, and disappears at a mean length of 2.8 μm, probably due to the steeper slope of the length tension diagram at rest. Since the isometric extratension in a tetanus is highest at 120% resting length (corresponding to about 2.7 μm sarcomere length), the force of C-fibres exceeds that of B-fibres at 2.6 μm but not at 2.8 μm sarcomere length. Red and white muscle differ with respect to vascularisation. The relation between the densities of capillaries in soleus and gastrocnemius of cat is 2.7∶:1 and equals the relation between the blood flows through these muscles during rest and maximum vasodilatation.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 26
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 113 (1971), S. 311-321 
    ISSN: 1432-0878
    Keywords: Ultimobranchial body ; Calcitonin ; Turtle ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultimobranchial body of fresh-water turtles,Pseudemys scripta andChrysemys picta, ultrastructurally and histochemically resembles the gland of other vertebrate groups and the homologous thyroid parafollicular cells of mammals. Characteristic features of all of these tissues are secretory granules measuring approximately 150–250 mμ, a distended endoplasmic reticulum, prominent Golgi regions and large numbers of free ribosomes. Unusual features of the turtle ultimobranchial body are an abundance of large cytoplasmic bodies measuring 800–1000 mμ and a dense, homogenous material within the lumina of the ultimobranchial follicles. The large cytoplasmic bodies usually occur near the luminal portion of the cells and are of similar electron density to the luminal contents, suggesting a possible functional relationship of these two glandular components.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 27
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 114 (1971), S. 61-72 
    ISSN: 1432-0878
    Keywords: Corpora cardiaca ; Neurosecretion ; Insects ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les corpora cardiaca de l'adulte de Locusta migratoria sont formés de deux régions bien individualisées ce qui nous a permis de reconnaître la sécrétion propre des différents types de neurosécrétion. Dans la région nerveuse, nous distinguons par la taille des grains trois types de neurosécrétion dense classique et un quatrième type d'aspect clair. Dans la région »propre« non nerveuse, les cellules ont des caractères nettement endocriniens et sont mélangées à un seul type d'axones neurosécréteurs.
    Notes: Summary The corpora cardiaca of adult Locusta migratoria consist of two well separated areas, a fact which permits the differentiation between intrinsic and extrinsic neurosecretory material. In the neural area three types of electron dense “classical” neurosecretory granules, and a fourth more lucent type can be distinguished according to size. In the non-neural “glandular” area typical endocrine cells mingle with only one type of neurosecretory axons.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 28
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 117 (1971), S. 139-154 
    ISSN: 1432-0878
    Keywords: Receptor cells ; Amines ; Lumbricus ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Receptor cells in the epithelium and the basiepithelial nerve net of the prostomium of Lumbricus terrestris were investigated with electron microscope with special regard to the presence of monoamines. The receptor cells are found in groups of about 40 intermingled with supportive cells. After pretreatment with α-methyl-noradrenaline and fixation with potassium permanganate a few receptor cells in each group and some nerve fibres in the basiepithelial nerve net contain small granular vesicles (about400 Å) characteristic for monoaminergic neurons. The distribution and relative number of these receptor cells and nerve fibres coincide well with previous reports on fluorescent receptor cells and varicose fibres. That the monoamine-storing small granular vesicles not are visualized until pretreatment with α-methyl-noradrenaline is in accordance with recent microspectrofluorometric analysis, which shows that dopamine is the only primary monoamine present in the epithelium. In the epithelium there are occasional receptor cells and nerve fibres containing large vesicles (1000–1800 Å) which resemble the neurosecretory vesicles in the central nervous system. Photoreceptor cells having an intracellular cavity with microvilli and cilia have infrequently been observed at the base of the epithelium. No synapses on the mucous cells have been noticed. Nor have any synaptic specializations been observed in the basiepithelial nerve net. The morphological conditions necessary for the existence of possible axo-axonal synapses are briefly discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 29
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 120 (1971), S. 137-150 
    ISSN: 1432-0878
    Keywords: Umbilical vessels ; Guinea-pig ; Innervation ; Intermuscular contacts ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Umbilical vessels of guinea-pig fetuses were studied shortly before birth. In all umbilical cords investigated an innervation of the umbilical vessels is lacking. The intrafetal parts of the umbilical vessels on the other hand are richly innervated. A marked difference in the amount of nerve fibres and the pattern of innervation is found between artery and vein. The artery is supplied by a dense nerve plexus which spins around the media and which originates from nerve bundles within the outer adventitial layers. The comparatively scanty innervation of the vein exhibits a more coarsely meshed net pattern. The nerve bundles in the vein exhibit a close affinity to the vasa vasorum. Number and type of the close contacts between the muscle cells are different in the various sections of the umbilical vessels. Similar to the distribution of nerves they are almost absent in the vessels of the umbilical cord, numerously, however, in the intrafetal parts. Contrary to the innervation, the close contacts in the vein are developed more numerously and more broadly than in the corresponding artery.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 30
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 120 (1971), S. 386-400 
    ISSN: 1432-0878
    Keywords: Nervous System ; Carcinus maenas ; Cerebral ganglion ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The organization of the cerebral ganglion of the shore crab Carcinus maenas, is investigated by conventional histological and electronmicroscopic techniques. This study forms part of a comprehensive survey of the blood-brain interface, particularly interesting in this group, as decapod Crustacea are unusual among invertebrates in possessing an intracerebral blood supply. Apart from the intracerebral blood vessels, tissue organization is closely similar to that observed in insect central neural ganglia. The ganglion is surrounded by the neural lamella, an acellular connective tissue sheath, probably containing mucopolysaccharide and collagen. A layer of specialised glia, the perineurium, immediately underlies the neural lamella, and appears to contribute to its formation. Large glia occupying a conspicuous cortical zone below the perineurium may be involved in glycogen metabolism and storage. Further morphologically distinct glial types are observed associated with neurones and blood vessels, but all neuroglia within the ganglion are probably of common origin. Neurone cell bodies are generally situated peripherally in groups, and send axons into neuropil (synaptic) areas in the ganglion core. Large lacunae in the cortical region and narrower 20 nm clefts deeper in the ganglion, constitute the interstitial space, and contain deposits of fibrillar material. Possible physiological implications are discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 31
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 120 (1971), S. 463-487 
    ISSN: 1432-0878
    Keywords: Cardiogenesis ; Cell Junctions ; Permeability ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Studies of cardiogenesis in the chick embryo focus attention upon the intercellular junctions of epicardial, myocardial, and endocardial cells, and the role they play in diffusion across the cardiac wall. Cell membranes of apposed epicardial cells approach as close together as 40 Å; those of the endocardium additionally form focal tight junctions. In the myocardium focal tight junctions are restricted to the apposed membranes of the superficial layer of cells. The majority of close appositions in all parts of the myocardium are 40 Å gap junctions. Desmosomes and fascia adherens are distributed throughout the myocardium. Diffusion of horseradish peroxidase through the epicardium and endocardium occurs primarily through the intercellular junctions. The width of the cleft between cells, 200–300 Å, also permits the diffusion between cells of the larger ferritin particles. Pinocytotic activity, responsible for ferritin transfer across mesothelial and endothelial cells in the adult, is not significant. Tracers injected into the pericardial cavity or vasculature can be observed passing through the heart in the direction of their respective diffusion gradients. Unlike the apical junctions of epithelial cells, to which they have been compared, membrane specializations of the superficial myocytes do not form a seal separating the pericardial cavity, or subepicardial space, from the extracellular spaces of the myocardium.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 32
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 121 (1971), S. 153-170 
    ISSN: 1432-0878
    Keywords: Neutrophilic myelocyte ; Human bone marrow ; Secondary granulogenesis ; Phase contrast microscopy ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The developmental changes in the neutrophilic myelocyte from normal human bone marrow have been analyzed by means of phase contrast and electron microscopy. This developmental stage is characterized principally by the elaboration of secondary (specific) granules. In addition, there is a modest decrease in cell size, a decrease in the number and mean size of primary (azurophil) granules, a decrease in the number of polysomes, free ribosomes and mitochondria, a depletion of rough endoplasmic reticulum, an increase in cytoplasmic glycogen, an increase in chromatin aggregations and a loss of nucleoli, and the formation of a markedly indented nucleus. The myelocyte stage has been subdivided into three arbitrary phases based upon morphological and functional characteristics which relate to the onset, active production and cessation of secondary granulogenesis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 33
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 97-101 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurde Äthylendiammonium-oxopentachloromolybdat(V), enH2 · [MoOCl5], in reiner Form (grün) dargestellt und durch Analyse, Oxydationsstufe, Magnetismus (μeff = 1,63 BM), IR- und Elektronenspektrum sowie durch Leitfähigkeitsmessungen charakterisiert. Einige seiner Reaktionen in Lösung und festem Zustand wurden untersucht.
    Notes: Ethylene diammonium oxopentachloro molybdate(V) enH2 [MoOCl5] (where en = ethylene diammine) has been isolated in pure state and has been characterised by chemical analysis, oxidation state determination, magnetic measurement, spectroscopic investigations and conductivity measurements. Its reactions have been studied in solution and solid state.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 34
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971) 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 35
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 111-117 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die magnetischen Suszeptibilitäten einer Serie von ternären intermetallischen Verbindungen der Zusammensetzung ThM2X2(M = Cr, Mn, Fe, Co, Ni, Cu; X = Si, Ge) ermittelt (FARADAY-Methode, 100-570°K). Dabei wurde dasjenige magnetische Verhalten beobachtet, das kürzlich auf Grund der Abhängigkeit der Kristall-strukturparameter von der Atomnummer des jeweiligen Übergangsmetalls vorhergesagt wurde. Je nach der Atomnummer des Übergangsmetalls sind diese Verbindungen abwechselnd ferro- oder antiferromagnetisch.
    Notes: Magnetic susceptibilities of a series of ternary intermetallic compounds of the general composition ThM2X2(M = Cr, Mn, Fe, Co, Ni and Cu; X = Si and Ge) were determined by means of FARADAY method in the temperature interval 100-570°K. The results confirm the previously proposed magnetic behaviour of these compounds, based on the observation of the basic crystallographic parameters as a function of the atomic number of the transition metal element. The compounds were found to be alternatively ferromagnetics and antiferromagnetics depending on the atomic number of the transition metal atom.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 36
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 128-136 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The IR- and RAMAN spectra are reported for the above mentionned compounds. All valence force-constants are calculated. The substitution of oxygen by sulfur causes a decrease of all force-constants. 18% for f P—OCH3 and f P—SCH3, 10% for f O=P and f S=P and 2% for f O—CH3 and f S—CH3.
    Notes: Es wurden die IR- und RAMAN-Spektren von folgenden Verbindungen aufgenommen und zugeordnet: OP(OCH3)3, OP(OCH3)2(SCH3), OP(OCH3)(SCH3)2, OP(SCH3)3, SP(OCH3)3, SP(OCH3)2(SCH3), SP(OCH3)(SCH3)2 und SP(SCH3)3. Mit Hilfe eines Näherungsverfahrens werden sämtliche Valenzkraftkonstauten berechnet. Ganz allgemein ergibt der Ersatz von Sauerstoff durch Schwefel eine Abnahme aller Kraftkonstanten, am stärksten für f P—OCH3 und f P—SCH3 (18%), bei f P=O und f S=P von 10% und bei f O—CH3 und f S—CH3 von 2%.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 37
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 137-145 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The IR- and RAMAN-spectra are reported from OP(OCH3)2Cl, OP(OCH3)Cl2, SP(OCH3)Cl, SP(OCH3)Cl2. The assignement to the fundamental vibration is given and all Valence-force-constants are calculated. With increasing number of chlorine atoms decrease f P—OCH3 and f P—Cl. In the contrary, f O—P and f S—P increase. Here the influence of decreasing electro negativity is compensated by the change from an element of the first period of eight elements to an element of the second period.
    Notes: Es werden IR- und RAMAN-Spektren mitgeteilt von OP(OCH3)2Cl, OP(OCH3)Cl2, SP(OCH3)2Cl und SP(OCH3)Cl2 und den Grundschwingungen zugeordnet. Für alle Glieder der beiden Reihen werden nach einem Näherungsverfahren sämtliche Valenzkraftkonstanten berechnet und untereinander verglichen. Für f P—OCH3 und f P—Cl ergeben sich mit steigender Zahl der Chloratome erniedrigte Werte. Für f O—P und f S—P ergibt sich eine leichte Steigerung. Demnach wird bei diesen Bindungen der Einfluß der fallenden Elektronegativität durch den Einfluß der Elemente höherer Perioden überkompensiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 38
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 146-159 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tc2O7 crystallizes in the orthorhombic space group Pbca with a = 13.756, b = 7.439, c = 5.617 Å, Z = 4. The single crystal structure analysis shows the crystals to contain isolated centrosymmetric Tc2O7 molecules with a linear central Tc—O—Tc bridge and with, tetrahedral coordination of the Tc atoms. Tc—O bond lengths: 1.840 (bridge), 1.658, 1.684 and 1.706 Å. The structure is more closely related to CrO3, RuO4 and OsO4 than to Re2O7.Structural properties of the d° transition metal oxides are briefly discussed.
    Notes: Tc2O7 kristallisiert orthorhombisch mit a = 13,756, b = 7,439, c = 5,617 Å, Z = 4 in der Raumgruppe Pbca. Die vollständige Röntgenstrukturanalyse zeigt, daß im Kristall zentrosymmetrische Tc2O7-Molekeln mit tetraedrischer Koordination des Metalls und linearer Tc—O—Te-Brücke vorliegen. Tc—O-Bindungsabstände: 1,840 (Brücke), 1,658, 1,684 und 1,706 Å.Damit sind Struktur und Koordinationsverhältnisse der Kettenstruktur des CrO3 und den Molekülstrukturen von RuO4 und OsO4 ähnlicher als der polymeren Schichtstruktur des Re2O7.Struktureigensehaften von d°-Übergangsmetalloxiden werden kurz im Zusammenhang diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 39
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 13 new complex salts of the [Cr(NCS)4(p-anisidine)2]- have been synthesized and the solvation kinetics of this anion has been studied in ethanol-water mixtures. The first two NCS- ions are exchanged for water molecules. In acid solutions the rate of this reaction is not influenced by the solvent composition.In parallel with this reaction, p-anisidine molecules are substituted, too, by ethanol molecules. (Acceleration by hydrogen ions.) In the resulting complex ion the first two NCS- ions are substituted, too, by water molecules. The rate constants of this reaction are rather close to those of the reaction which leads to the exchange of the first two NCS- ions in the initial complex. The third and fourth NCS- ions are substituted only in neutral solutions by water molecules. Kinetic parameters have been derived for the substitution of the first two NCS- ions and for the substitution of the p-anisidine molecules.
    Notes: Es wurden 13 neue Komplexsalze mit den Anion [Cr(NCS)4(p-Anisidin)2]- dargestellt und die Solvatationskinetik dieses Anions in Äthanol-Wasser-Mischungen untersucht. Danach kann man die folgende Reaktionsschemata annehmen. Die ersten zwei NCS--Ionen werden gegen Wassermolekeln ausgetauscht. In sauren Lösungen wird die Geschwindigkeit dieser Reaktion nicht von der Lösungsmittelzusammensetzung beeinflußt. Parallel zu dieser Reaktion werden die p-Anisidinmolekln gegen Äthanol ausgetauscht. Diese Reaktion wird durch Wasserstoffionen beschleunigt. In den entstehenden Komplexionen sind die ersten zwei NCS--Ionen ebenfalls gegen Wasser ausgetauscht. Die Geschwindigkeitskonstanten dieser Reaktion sind von der gleichen Größenordnung wie die Geschwindigkeitskonstanten der Reaktion, die zum Austausch der ersten zwei NCS--Ionen aus dem ursprünglichen Komplexion führt. Die dritten und vierten NCS--Ionen werden nur in neutralen Lösungen gegen Wasser ausgetauscht. Kinetische Parameter für den Austausch der ersten zwei NCS--Ionen und der p-Anisidinmolekeln wurden ermittelt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 40
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 275-282 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In the solid state complexes of the type MiL2X2 (L = N-substituted β-aminoethyl-pyridine; X = Cl, Br, J) have a cis-octahedral (X = Cl, Br) or a distorted trigonal bipyramidal structure (X = J). In solutions in acetone a partial dissociation occurs with the formation of NiLX2, L, NiL2X+, and X-. Using a spectrophotometric method stability constants K2S of the complexes NiL2X2 are determined. A correlation exists between log K2s and the pK- values of the quarternary ammonium ions derived from the ligands L. Sterical factors cause the exeptional position of the chelates of β-methylaminoethylpyridine-(2).
    Notes: Komplexe des Typs NiL2X2 (L = N-substituiertes Aminoäthylpyridin; X = Cl, Br, J) besitzen im kristallinen Zustand eine cis-oktaedrische (Chloride und Bromide) bzw. verzerrt trigonal-bipyramidale Struktur (Jodide). In Acetonlösung erfolgt eine partielle Dissoziation unter Bildung von NiLX2, L, NiL3Y+ und X-. Auf spektralphotometrischem Wege werden Stabilitätskonstanten K2s für die 1,2-Komplexe ermittelt. Zwischen log K2S für die Verbindungen NiL2Cl2 und NiL2J2 und den Säureexponenten der von den Liganden L abgeleiteten quarternären Ammoniumionen besteht Korrelation. Die Sonderstellung der Chelate des β-Methylaminoäthylpyridins-(2) wird auf sterische Faktoren zurückgeführt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 41
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 283-292 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The relative acidity of substituted triphenyl silanols [X - C6H4-]3Si -OH is measured by means of potentiometric titration. The substituent effect is well defined by σ0-constants(3).
    Notes: Durch potentiometrische Titration in nichtwäßrigen Lösungen wird die relative Acidität von substituierten Triphenyl-silanolen [X - C6H4 -]3Si - OH gemessen. Der Substituenteneinfluß kann durch die σ0-Konstante3 gut wiedergegeben werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 42
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 293-302 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tbe RAMAN and IR spectra (400-4000 cm-1, partly also 200-400 cm-1) of (NH2)2-, K2-, Rb2- and Cs2[CH3SiF5] were recorded and the bands were assigned. A normal coordinate calculation of the [CH3SiF5]2- ion has been made. By means of IR spectroscopy the stability of the methylpentafluorosilicates were examined.
    Notes: Von (NH4)2-, K2-, Rb2- und Cs2[CH3SiF5] wurden die RAMAN -und IR-Spektren (400-4000 cm-1, z. T. auch. 200-400 cm-1) gemessen und die in den Spektren auftretenden Linien bzw. Banden weitgehend zugeordnet. Ferner wurde eine Normalkoordinatenanalyse des [CH3SiF5]2--Ions durchgeführt. Mit Hilfe der IR-Spektroskopie wurde ferner die Beständigkeit der Methylpentafluorosilicate untersucht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 43
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 314-321 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic sulphurylphosphazochloride (I: formula see „Inhaltsübersicht“) reacts with ammonia or methylamine forming the. tetramide(II) and (III), respectively, and with aniline or dimethylamine forming the diamide (IV) resp. (V). The synthesis of the diphenyl derivative (VI) is achieved starting from C6H5—PCl4. (II) gives with PCl5 the ionic compound (VII).
    Notes: Cyclisches Sulfurylphosphazochlorid (I) reagiert mit Ammoniak oder Methylamin zu den Tetramiden (II) und (III) und mit Anilin oder Dimethylamin zu don Diamiden (IV) und (V). Die Synthese eines Diphenylderivates (VI) gelingt ausgehend von C6H5—PCl4. (II) reagiert mit PCl5 zu der ionischen Verbindung (VII) .
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 44
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 303-313 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The decomposition of formic- acid vapour has been studied on annealed nickel-copper alloy films. The activity pattern of short-time annealed alloys reveals two maxima and in the range of 50% Ni a minimum. The maxima disappear, when the films are annealed for a longer time. One gets nearly the same variations of the curves of short-and long-time annealed films, when plotting the initial change of electric resistance of the films during reaction against the composition.It is concluded that depending on annealing conditions the surface of the alloys is more or less covered by a copper-rich alloy phase. This is supported by X-ray analysis, confirming the formation of two alloy phases.
    Notes: An Nickel-Kupfer-Legierungsfilmen mit verschiedener Temperzeit wurde die Ameisensäuredampfzersetzung untersucht. Die katalytische Aktivität der kurz getemperten Legierungen zeigte in Abhängigkeit von der Zusammensetzung zwei Maxima und bei 50% Ni ein Minimum. Bei Verlängerung der Temperzeit bei 220°C verschwanden die beiden Maxima, und es wurde eine annähernd konstante niedrige Aktivität über einen weiten Bereich gefunden. Der elektrische Widerstand der Filme zu Beginn der Reaktion zeigte ebenfalls typische Veränderungen durch das Tempern, Es wird daraus der Schluß gezogen, daß sich durch das Terapern bei 200°C an der Oberfläche der Legierungen Kupfer anreichert. Das geschieht am leichtesten bei etwa 50% Ni. Diese Annahme wird gestützt durch Ergebnisse der Röntgenstrukturanalyse, die das Vorhandensein von zwei Legierungsphasen anzeigte.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 45
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 381 (1971), S. 189-197 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The following oxyfluorides, of tetravalent vanadium A3VOF5 (A = Na), A2VOF4 (A = K, Rb), A3V2O2F7 (A = Cs) and A2A'VOF5 (A = K, Rb, Cs; A' = Li, Na, K, Rb), prepared from solution or by solid state reaction, were investigated by x-rays. Na3VOF5 crystallizes in the monoclinic cryolite type. The compounds K2VOF4 and Rb2VOF4 show orthorhombic, Cs3V2O2F7 hexagonal symmetry. The oxyfluorides A2A'VOF5 belongs to the elpasolite type. Reflectance spectra (6666-40000 cm-1) and magnetic properties of these compounds were measured. The magnetic susceptibilities obey the CURIEWEISS law.
    Notes: Die folgenden Oxidfluoride des 4-wertigen Vanadiums A3VOF5(A = Na), A2VOF4 (A = K, Rb), A3V2O2F7 (A = Cs) und A2A'VOF5 (A = K, Rb, Cs; A' = Li, Na, K, Rb) wurden teils aus Lösung, teils durch Festkörperreaktion hergestellt und röntgenographisch untersucht. Na3VOF5 kristallisiert im monoklinen Kryolithtyp, K2VOF4 und Rb2VOF4 sind rhombisch und Cs3V2O2F7 ist hexagonal. Die hergestellten Oxidfluoride A2A'VOF5 gehören zum Elpasolithtyp. Die Reflexionsspektren (6666 bis 40 000 cm-1) und der Magnetismus dieser Verbindungen wurden gemessen. Die magnetischen Suszeptibilitäten befolgen das CURIE-WEISS'sche Gesetz mit θ-Werten zwischen -8 und -22°.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 46
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 381 (1971), S. 168-175 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Decamethylcyclotetrasilazane (I) was prepared starting with 1,3-dichloropentamethyldisilazane (II), 1.3-dichlorotetramethyldisilazane (III) and 1,3-bis-(methylamino)tetramethyldisilazane (IV). respectively, according to scheme 1, equ. (1), (2) and (3) in the text. (I) does not form, as given in the literature (equ. 4)5, by thermal transformation of bis(methylaminodimethylsilyl)-tetramethylcyclodisilazane (V); in this case exclusively - in equ. (2) and (3) only in side steps - the reaction products are a mixture of N-methylcyclotrisilazanes (scheme 2, VI-IX).
    Notes: Dekamethylcyclotetrasilazan (I) läßt sich aus 1,3-Dichlorpentamethyldisilazan (II), 1,3-Dichlortetramethyldisilazan (III) wie auch aus 1,3-Bis(methylamino)-tetramethyldisilazan (IV) gemäß Schema 1, Rkk. (1) bis (3), nicht jedoch durch die in der Literatur5 beschriebene thermische Umlagerung von Bis(methylaminodimethylsilyl)-tetramethylcyclodisilazan (V) (vgl. Rk. 4) darstellen. Hierbei entsteht ausschließlich, - in den Rkk. (2) und (3) nur auf Nebenwegen -, ein Gemisch von N-Methylcyclotrisilazanen (Schema 2, VI-IX).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 47
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 382 (1971) 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 48
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 381 (1971), S. 321-321 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 49
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 382 (1971), S. 27-30 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Products of the reaction between CH3N(PCl3)(BCl3) and AsF3 are BF3, AsCl3 and N,N′-dimethyldiazafluorophosphetidine IV. [(CH3)2NPCl3][BCl4] reacts with AsF3 to give dimethylaminotetrafluorophosphorane VI. Preparation and NMR data of IV and VI are given.
    Notes: Als Reaktionsprodukt der Umsetzung von CH3N(PCl3)(BCl3) mit AsF3 entsteht neben BF3 und AsCl3 N,N′-Dimethyldiazafluorophosphetidin IV. [(CH3)2NPCl3][BCl4] setzt sich mit AsF3 zu Dimethylaminofluorophosphoran VI um. Darstellung und NMR-Daten von IV und VI sind beschrieben.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 50
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 144-150 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tungsten hexachloride reacts with dimethyl zinc or diphenyl zinc forming green methyl or phenyl tungsten pentachloride. However, tungsten hexachloride is reduced to tungsten tetrachloride on addition of zinc dialkyls with longer alkyl groups. Furthermore, alkyl tungsten pentachlorides can be prepared from tungsten hexachloride and tin tetraalkyls or boron trialkyls.
    Notes: Wolfram(VI)-chlorid reagiert mit Zinkdimethyl bzw. -diphenyl zu grünem Methylwolframpentachlorid bzw. Phenylwolframpentachlorid. Bei Einwirkung längerkettiger Zinkdialkyle wird dagegen das Wolfram(VI)-chlorid zu Wolfram(IV)-chlorid reduziert. - Nach einer allgemein anwendbaren Methode lassen sich Alkylwolframpentachloride aus Wolfram(VI)-chlorid und Zinntetraalkylen oder Bortrialkylen darstellen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 51
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 136-143 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrolysis of 1-chloro-arsolane, C4H8AsCl, and 1-chloro-arsenane, C5H10AsCl, leads to oxides C8H10As2O and C10H20As2O, respectively. On direct alkylation of arsenic trioxide with 1.4-butane- and 1.5-pentane-bis-magnesium bromide these oxides are formed only in trifling amounts. Better results are gained by alkylation of N,N-dimethylaminodichloroarsane into amino-arsolane and amino-arsenane, which are also transformed into these oxides by hydrolysis. By hydrolysis of 1.4-dichloro-diarsenane only a small amount of 1.4-epoxo-arsenane is formed, whereas mainly a dimer of this oxide results. Solvolysis of 2.6-dichloro-diarsa-[3.3.0]-bicyclooctane with water, hydrogen sulphide or methylamine leads to 7-oxa-, 7-thia- and 7-methylaza-2.5-diarsa-noradamantane, respectively.
    Notes: Hydrolyse von 1-Chlor-arsolan, C4H8AsCl, und 1-Chlorarsenan, C5H10AsCl, führt zu Oxiden der Zusammensetzung C8H16As2O bzw. C10H20As2O. Die direkte Alkylierung von Arsentrioxid mit 1.4-Butan- und 1.5-Pentan-bis-magnesiumbromid liefert diese Oxide nur in geringen Ausbeuten. Günstiger verläuft die Alkylierung von N,N-Dimethylamino-dichlor-arsan zum Aminoarsolan und Amino-arsenan, die durch Hydrolyse ebenfalls in die Oxide überführt werden. Bei Hydrolyse von 1.4-Dichlor-diarsenan bildet sich wenig 1.4-Epoxo-arsenan, während in der Hauptsache ein Dimeres dieses Oxids entsteht. Solvolyse von 2.6-Dichlor-diarsa-[3.3.0]-bicyclooctan mit Wasser, Schwefelwasserstoff oder Methylamin führt zu 7-Oxa-, 7-Thia- und 7-Methylaza-2.5-diarsa-noradamantan.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 52
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 234-241 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The hitherto unknown compounds Ca2CuO3 and SrCuO2 were prepared and the structure determined by investigations of single crystal X-ray data. Results see „Inhaltsübersicht“.
    Notes: Ca2CuO3 und SrCuO2 wurden erstmals dargestellt und an Einkristalldaten die Kristallstruktur bestimmt. Ca2CuO3 ist isotyp mit Sr2CuO3; Raumgruppe D2h25-Immm; a = 12,239, b = 3,779, c = 3,259 Å. SrCuO2 ist isotyp mit einer Ni-haltigen Verbindung der Zusammensetzung SrCu0,75Ni0,25O2; Raumgruppe D2h17 - Cmcm; a = 3,565; b = 16,326; c = 3,921 Å.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 53
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 242-254 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Li2SnO3 crystallises monoclinic, C2h6, with a = 5.295, b = 9.184, c = 10.032 Å and β = 100.13°; Z = 8. The positions of Sn were obtained from PATTERSON maps and the positions of O and Li by FOURIER difference method. Parameters were refined by least squares-method [1462 reflexes (h 01)-(h 71); R = 10.5%]. The average distances of Li—O are 2.07 Å, and 2.20 Å for Sn—O. The Li2SnO3 structure can be derived from the NaCl type: in a cubic closest packing of oxygen 2/3 of the octahedral holes are occupied by lithium and 1/3 by tin.
    Notes: Li2SnO3 kristallisiert monoklin, C2h6, mit a = 5,295, b = 9,184, c = 10,032 Å und β = 100,13°; Z = 8. Die Punktlagen von Sn konnten aus PATTERSON-Synthesen und die von O und Li aus Differenz-FOURIER-Synthesen bestimmt werden. Die Parameter wurden mittels der „Least-squares-Methode“ [1462 Reflexe (h 01)-(h 71)] verfeinert; der R-Wert beträgt 10,5%. Die mittleren Abstände betragen Sn—O 2,20 Å und Li—O 2,07 Å. Die Li2SnO3-Struktur läßt sich vom NaCl-Typ ableiten: die Oktaederlücken der kubisch-dichtesten Sauerstoffpackung sind geordnet zu 2/3 mit Li und zu 1/3 mit Sn besetzt.
    Additional Material: 11 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 54
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 262-272 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Molybdenum dioxiddibromide and -dichloride have been prepared from MoO2, Br2, und Cl2, respectively, and their chemical and thermochemival behaviour was studied. Their enthalpies of formation, ΔH°, have been determined from the solution enthalpies of MoO2Br2, and MOo2Cl2, in aqueous NaOH (data see „Inhaltsübersicht“). From their sublimation pressures, p, the enthalpies, ΔH° (subl.), and entropies, ΔS° (subl.), of sublimation have been evaluated (data see above).
    Notes: Molybdändioxiddibromid und Molybdändioxiddichlorid wurden aus MoO2, und Br2, bzw. C12, dargestellt und ihr chemisches und thermochemisches Verhalten untersucht. Die Bildungsenthalpien \documentclass{article}\pagestyle{empty}\begin{document}$$ \Delta {\rm H}^ \circ ({\rm MoO}_{\rm 2} {\rm Br}_{\rm 2},{\rm f, 298}){\rm = - 153,2 (} \pm {\rm 1) kcal/Mol} $$\end{document} und \documentclass{article}\pagestyle{empty}\begin{document}$$ \Delta {\rm H}^ \circ ({\rm MoO}_{\rm 2} {\rm Br}_{\rm 2},{\rm f, 298}){\rm = - 173,8 (} \pm {\rm 1) kcal/Mol} $$\end{document} wurden aus den Lösungsenthalpien von MoO2 Br2 und MoO2Cl2 in Natronlauge ermittelt. Die Sublimationsdrucke ergeben sich für \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm MoO}_{\rm 2} {\rm Br}_{\rm 2} {\rm zu lg p (MoO}_{\rm 2} {\rm Br}_{\rm 2} {\rm, mm}){\rm = - 13,473 -}\frac{{{\rm 5377}}}{{\rm T}} $$\end{document} und für \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm MoO}_{\rm 2} {\rm Br}_{\rm 2} {\rm zu lg p (MoO}_{\rm 2} {\rm Cl}_{\rm 2} {\rm, mm}){\rm = - 13,971 -}\frac{{{\rm 4767}}}{{\rm T}}, $$\end{document} woraus sich die Sublimationsenthalpien und -entropien \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} \Delta {\rm H}^ \circ ({\rm subl}{\rm ., MoO}_{\rm 2} {\rm Br}_{\rm 2},{\rm 458}){\rm = 24,6 (} \pm 0,5{\rm ) kcal/Mol,} \\ \Delta {\rm H}^ \circ ({\rm subl}{\rm ., MoO}_{\rm 2} {\rm Cl}_{\rm 2},{\rm 380}){\rm = 21,8 (} \pm 0,5{\rm ) kcal/Mol,} \\ \Delta {\rm S}^ \circ ({\rm subl}{\rm ., MoO}_{\rm 2} {\rm Br}_{\rm 2},{\rm 458}){\rm = 48,4 (} \pm 0,3{\rm ) cl,} \\ \Delta {\rm S}^ \circ ({\rm subl}{\rm ., MoO}_{\rm 2} {\rm Cl}_{\rm 2},{\rm 380}){\rm = 50,7 (} \pm 0,3{\rm ) cl,} \\ \end{array} $$\end{document} ergeben.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 55
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 286-292 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The preparation of uncharged complexes with metal amide bonds of type [MeN4]±0 (Me = Zn2+, Cr2+ is reported. These compounds are obtained by the interaction between Zn(C6H5)2 or Cr(C6H5)3 · 3 THF and 2-[β-(phenyl-amino)-ethyl]-pyridine (I). The same complexes are formed by the reaction between ZnCl2 · 2 THF, CrBr2 · 2 THF, or CrCl3 · 3 THF and the lithium amide (II), which is prepared from (I) and phenyl lithium. The structure of the chromium(II) complex is discussed on the basis of magnetic and visible absorption measurements.
    Notes: Es wird über die Darstellung von Neutralkomplexen mit Metallamidbindungen vom Koordinationstyp [MeN4]±0 der Zentralatome Zn2+ und Cr2+ berichtet. Sie entstehen aus Zn(C6H5)2 bzw. Cr(C6H5)3 · 3 THF durch Umsetzung mit 2-[β-Phenylamino)-äthyl]-pyridin (I) oder aus der mittels Lithiumphenyl aus (I) darstellbaren Lithiumamidverbindung und den Metallhalogenidtetrahydrofuranaten ZnCl2 · 2THF, CrBr2 · 2 THF oder CrCl3 · 3 THF. Der Einsatz von Chrom(III)-Verbindungen führt in jedem Falle zum Chrom(II)-Komplex, dessen Struktur auf der Basis des magnetischen Momentes und des sichtbaren Spektrums diskutiert wird.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 56
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 300-311 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The polymerisation of S2O gives solid polysulfur oxides in which the atomic ratio S : O lies between 2.4 : 1 and 3.7 : 1. Solutions of polysulfur oxides produced by dissolving S2O in suitable cold solvents are stable for several days below -50°C, but for only a few hours at -20°C. Soluble polysulfur oxide obtained in chloroform at -60°C with concentrations from 0.01-0.07 mole/1 has the formula S5O. With pure HJ it can be reduced quantitatively to S8.
    Notes: Bei der Polymerisation des S2O entstehen feste Polyschwefeloxide, in denen das S : O-Atomverhältnis zwischen den Werten 2,4 : 1 und 3,7 : 1 liegt. Leitet man S2O in geeignete kalte Lösungsmittel ein, so entstehen Polyschwefeloxidlösungen, die bei -50°C tagelang, bei -20°C nur wenige Stunden beständig sind. Das in Chloroform bei -60°C in 0,01-0,07 molarer Konzentration gelöste Polyschwefeloxid besitzt die Formel S5O. Es läßt sich mit wasserfreiem Jodwasserstoff quantitativ zu S8 reduzieren.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 57
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 320-321 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-ray amorphous iron(III) hydroxide is formed on treating FeCO3 with H2O2. However, oxidation of freshly precipitated FeCO3 by means of air yields  -  in the absence of foreign cations  -  γ-FeOOH and α-FeOOH. The latter is obtainable in the pure state provided that FeCO3 is air-oxidised in alkaline medium (excess of Na2CO3).
    Notes: Während bei Behandlung von FeCO3 mit H2O2 röntgenamorphes Eisen(III)-hydroxid entsteht, bilden sich bei der Luftoxydation des gefällten FeCO3, sofern nicht Fremdkationen anwesend sind, γ-FeOOH und α-FeOOH. Letzteres ist aber nur dann faßbar, wenn FeCO3 mit einem Na2CO3-Überschuß gefällt und im alkalischen Reaktionsgemisch mit Luft oxydiert wird.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 58
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 322-328 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zwei neue Komplexe, [Cu(OP-gld)]2 und [Cu(OP-alad)]2 (s. Abb.2) mit einem anomal kleinen magnetischen Moment wurden dargestellt und durch Analyse, magnetische Messungen, IR- und Elektronenspektra und durch Leitfähigkeitsmessungen charakterisiert.
    Notes: Two new complexes, [Cu(OP-gld)]2 and [Cu(OP-alad)]2 (shown in Fig. 2) with a subnormal magnetic moment have been synthesized and characterized by means of analyses, magnetic susceptibility measurements, IR-, and electronic spectra, and conductivity measurement.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 59
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 337-337 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 60
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 332-336 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die Reaktionen zwischen Rubidiumcarbonat und Vanadinpentoxid bei verschieden hoher Temperatur untersucht. Vier Reaktionsprodukte der Zusammensetzungen: I. Rb2O · V2O5; II. 2 Rb2O · V2O5; III. 3 Rb2O · V2O5 and IV. Rb2O · 4 V2O5 wurden erhalten. Auf Grund der Bestimmung des Rubidiums und der Röntgenpulveraufnahmen der Produkte wurde die Existenz von Rubidiummetavanadat (RbVO3) und Rubidiumpyrovanadat (Rb4V2O7) nachgewiesen. Die Herstellung eines definierten Rubidiumorthovanadates (Rb3VO4) und -tetravanadates (Rb2O · 4 V2O5) gelang dagegen nicht. Das Debyeogramm von Rb2O · V2O5 ließ sich hexagonal indizieren mit den Gitterkonstanten a = 7,347 und c = 13,608 Å.
    Notes: The reactions between rubidium carbonate and vanadium pentoxide were performed at different high temperatures. Four reaction products of the compositions: I. Rb2O · V2O5; II. 2 Rb2O · V2O5; III. 3 Rb2O · V2O5; and IV. Rb2O · 4 V2O5 were obtained. According to the determination of Rb and the X-ray powder photographs of the products the existence of rubidium metavanadate (RbVO3) and rubidium pyrovanadate (Rb4V2O7) was confirmed. On the other hand, the preparation of a pure rubidium orthovanadate (Rb3VO4) and rubidium tetravanadate (Rb2O · 4 V2O5) was not successful. The diffraction pattern of Rb2O · V2O5 obeys hexagonal indexing with lattice dimensions a = 7.347 and c = 13.608 Å.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 61
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 7-15 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and properties of nickel(II) and cobalt(II) chelates of the bidentate ligand trans-2-ethylthio-cyclohexyl-phenylphosphine (ÄMCPP) are described.Three types of nickel(II) complexes have been obtained from ÄMCPP: the four-coordinated, square planar [Ni(ÄMCPP)2]X2 (X = J, Br, ClO4); five-coordinated [Ni(ÄMCPP)2X]X (X = Cl, NCS), [Ni(ÄMCPP)2X]BPh4 (X = Cl, NCS) and the octahedral [Ni(ÄMCPP)2Cl2]. Cobalt(II) forms tetrahedral 1.1-[Co(ÄMCPP)X2] (X = Br, Cl) and 1.2-Co(ÄMCPP)2X2(X = Br, Cl, NCS) complexes.All compounds were characterized by electronic reflectance and absorption spectra, conductivity and magnetic measurements.
    Notes: Darstellung und Eigenschaften von Chelatkomplexen des trans-2-Äthylmercapto-cyclohexyl-phenylphosphins (ÄMCPP) werden beschrieben. Nickel(II)-Salze bilden mit ÄMCPP 1.2-Komplexe der Koordinationszahlen 4, 5 und 6: [Ni(ÄMCPP)2]X2 (X = J, Br, ClO4); [Ni(ÄMCPP)2X]X (X = Cl, NCS); [Ni(ÄMCPP)2X]BPh4, (X = Cl, NCS) und [Ni(ÄMCPP)2Cl2]. Im Falle von Kobalt(II)-Salzen hingegen werden 1,1- und 1,2-Komplexe der allgemeinen Zusammensetzung [Co(ÄMCPP)X2] (X = Br, Cl) und Co(ÄMCPP)2X2(X = Br, Cl, NCS) erhalten.Aus Reflexions- bzw. Absorptionsspektren, Leitfähigkeitsmessungen und magnetischen Untersuchungen resultiert für die Nickel(II) -Verbindungen eine planquadratische, quadratisch-pyramidale bzw. oktaedrische Struktur, während die Kobalt(II)-Komplexe tetraedrisch konfiguriert sind.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 62
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 30-36 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The preparation and properties of cis-[Co(CN)3(NH3)3] are described. The vibrational, ultraviolet and visible spectra have been measured. The structure of the compound has been determined by X-ray methods. By thermal decomposition of the compound, Co2(CN)5NH2 and Co2(CN)5 have been obtained. Supercomplexes are formed with Ag+ and Hg2+ ions.
    Notes: Darstellung, Eigenschaften und Spektren von cis-[Co(CN)3(NH3)3] werden beschrieben. Die Röntgenstrukturanalyse beweist die cis-Konfiguration. Bei der thermischen Zersetzung entstehen Co2(CN)5NH2 und Co2(CN)5. Mit Ag+ und Hg2+ werden Überkomplexe gebildet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 63
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971) 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 64
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 382 (1971), S. 188-194 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The behaviour of Fe ions in partly exchanged samples of zeolite M (mordenite) after heating in air was investigated by means of Mössbauer spectroscopy. Results are deduced concerning the site and dynamics of the ions in the zeolitic lattice and concerning the growth of small α-Fe2O3 crystallites by diffusion to the outer surface.
    Notes: Das Verhalten von Fe-Ionen in teilweise ausgetauschten Proben von Zeolith M (Mordenit) nach Temperung an Luft wurde anhand von Mössbauer-Spektren untersucht. Es ergeben sich Aussagen zum Einbau und zur Dynamik der Ionen im Zeolithgitter und zum Wachstum von kleinen α-Fe2O3-Kristalliten durch Diffusion an die äußere Oberfläche.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 65
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 382 (1971), S. 177-187 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stoichiometric powder mixtures CaO/WO3 and SrO/WO3 react tribochemically on grinding in a vibrating mill to CaWO4 and SrWO4, respectively.IR spectra, X-raydiffraction, DTA and solubilities indicate at least 70-80% CaWO4 are formed after periods of drinding of 50 hours, and 100% SrWO4 after periods of 15 hours.Observations on the behaviour of the ground samples on subsequent annealing contribute to the general solid-state reaction MO + WO3 → MWO4.
    Notes: Die stöchiometrischen Pulvergemische CaO/WO3 und SrO/WO3 reagieren tribochemisch durch Schwingmahlung zu CaWO4 bzw. SrWO4IR-Spektren, Röntgen-Goniometer-Aufnahmen, DTA-Aufnahmen und Löslichkeitsuntersuchungen zeigen, daß nach einer Schwingmahldauer von 50 h mindestens 70-80% Calciumwolframat und nach einer Schwingmahldauer von 15 h annähernd 100% Strontiumwolframat durch tribochemische Reaktion entstehen.Die Beobachtungen des Verhaltens der Mahlproben beim Tempern geben einen Beitrag zur Festkörperreaktion im System MO + WO3 → MWO4.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 66
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 382 (1971) 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 67
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 225-233 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NaHC2O4 · H2O crystallizes in space group P 1 with a0 = 6,51, b0 = 6,66, c0 = 5,70 Å, α0 = 95,0°, β0 = 109,8°, γ0 = 74,9° and Z = 2. The structure was solved by direct methods. The refinement was carried out with 679 reflections to R1 = 7,7%. The angle between the O—C—O planes is 12,6°.
    Notes: NaHC2O4 · H2O kristallisiert in der Raumgruppe P 1 mit a0 = 6,51; b0 = 6,66; c0 = 5,70 Å, α0 = 95,0°, β0 = 109,8°, γ0 = 74,9° und Z = 2. Die Struktur konnte mit direkten Methoden aufgeklärt werden. Die Parameterverfeinerung mit 679 Intensitäten ergab einen R1-Wert von 7,7%. Die beiden O—C—O-Ebenen der Oxalatgruppe bilden einen Winkel von 12,6°.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 68
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 255-261 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Using single crystal data [96 h0l, MoKα; R = R′ = 0.104] the parameter z0 = 0.267 of NaInO2 was determined (hexagonal cell), leading to In—O = 2.155 Å (6×). Na2SnO3 = Na(Na1/3Sn2/3)O2 forms with NaInO2 mixed crystals whose range of miscibility were roughly determined at two temperatures of preparation (700, 1000°C).
    Notes: Anhand von Einkristalldaten [96 h0l, MoKα; R = R′ = 0,104] wurde bei NaInO2 z0 0,267 (hexagonale Aufstellung) bestimmt, entsprechend In—O = 2.155 Å (6×). NaInO2 bildet mit Na2SnO3 = Na(Na1/3Sn2/3)O2 Mischkristalle, deren Existenzbereich bei 2 Darstellungstemperaturen [700°, 1000°C] annähernd bestimmt wurde.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 69
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 328-337 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wird über eine neue kubisch-flächenzentrierte Phase der Zusammensetzung Bi3RO6 (R=Y, Gd) berichtet. Weiterhin werden Einzelheiten des Phasendiagramms Bi2O3-R2O3 (R=Y, Gd) diskutiert. Ähnliche Verbindungen mit R=Tb, Dy, Ho, Er werden untersucht.
    Notes: A new face centered cubic phase of composition Bi3RO6 (R=Y, Gd) is reported, and details of the Bi2O3-R2O3 (R=Y, Gd) phase diagrams are discussed. Similar compositions with R=Tb, Dy, Hc, Er are examined.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 70
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 341-350 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurde eine neue Klasse von Koordinationsverbindungen des dreiwertigen Kobalts mit Aminosäuren, die Trinitro(aminoacidato)amminkobaltat(III)-Komplexe synthetisiert. Die Synthese wurde durch Reaktion von Glykokoll, Alanin, α-Amino-buttersäure, bzw. Norvalin mit Erdmannschem Salz, bzw. 1,2,6-Trinitrotriamminkobalt(III) ausgeführt. Die gleichen Koordinationsverbindungen entstehen auch durch Oxydation von Co(II) zu Co(III) mit Wasserstoffperoxid in Anwesenheit von entsprechenden Ligandionen. Die Konfiguration der synthetisierten Koordinationsverbindungen wurde mittels chemischer und physikalischer Methoden (Vis- und Kernresonanzspektren) untersucht. Die Trinitro(aminoacidato)amminkobaltat(III)-Komplexe sind die intermediären Produkte bei der Synthese der Dinitrobis(aminoacidato)kobaltat(III)-Komplexe aus dem Erdmannschem Salz. bzw. 1,2,6-Trinitrotriamminkobalt(III)-Komplex und Aminosäuren.
    Notes: Synthesis of a new class of coordination compounds of cobalt(III) with amino acids (glycine, alanine, α-amino-butyric acid and norvaline), i.e., trinitro(aminoacidato)-amminecobaltate(III) salts, M[CoNH3Am(NO2)3], is described. The synthesis consists in the action of amino acid alkali salts on the Erdmann salt or peripheral isomer of trinitrotriamminecobalt(III). The same compounds were also obtained by direct synthesis, i.e., by hydrogen peroxide oxidation of cobalt(II) to cobalt(III) in the presence of the corresponding ligands. The peripheral configuration of the complexes obtained was determined by chemical and physical methods (electronic and PMR spectroscopy). The compounds are intermediates formed in obtaining of dinitrobis(aminoacidato)cobaltate(III) salts by the reaction of amino acids with the Erdmann salt or peripheral isomer of trinitrotriamminecobalt(III).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 71
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 293-299 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: By reaction of Li3N and LiCl at elevated temperatures the phases Li11N3Cl2 and Li9N2Cl3 were observed in the system Li3N/LiCI. Li9N2Cl3 has the anti-fluorite structure. The non-metal sites are completely occupied by nitrogen and chlorine ions in an random distribution, the metal sites incompletely by lithium corresponding to the composition of the phase. The structure of the Li11N3CI2 phase has not been determined due to the complexity of its X ray diagram.
    Notes: Durch Umsetzung von Li3N mit LiCl bei höheren Temperaturen wurden in dem System Li3N/LiCl die Phasen Li11N3Cl2 und Li9N2Cl3 festgestellt.Li9N2Cl3 kristallisiert im Anti-CaF2-Typ, wobei die Nichtmetallagen vollständig mit Stickstoff- und Chlorionen in statistischer Verteilung, die Metallagen entsprechend der Zusammensetzung der Phase unvollständig mit Lithiumionen besetzt sind. Die Struktur der Li11N3Cl2-Phase konnte infolge der Kompliziertheit ihres Röntgendiagramms nicht aufgeklärt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 72
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Stabilitätskonstanten der Komplexe von Mn++, Fe++, Co++, Ni++, Cu++, Zn++, Cd++ und UO++2 mit 5, 7-Dichlor-, 5, 7-Dibrom- und 5, 7-Dinitro-8-hydroxychinolin und der entsprechenden N-Oxide sind in Dioxan/Wasser-Gemischen (75/25) bei 35°C in Gegenwart von 0,20 m Natriumperchlorat durch Titration nach Irving und Rossotti bestimmt worden. Eine mögliche Erklärung für die beobachtete Abhängigkeit der Stabilitätskonstanten der Komplexe bei Variation des Liganden und andererseits bei Variation des Metalls wird vorgeschlagen.
    Notes: The stability constants of complexes of Mn++, Fe++, Co++, Ni++, Cu++, Zn++, Cd++ and UO++2 with 5,7-dichloro-, 5,7-dibromo- and 5,7-dinitro-8-hydroxyquinoline and their corresponding N-oxides have been determined in 75 + 25 v/v dioxan + water medium at 35°C in presence of 0.20 M sodium perchlorate by pH-titration technique as given by IRVING and Rossotti. A possible explanation for the observed orders of the stability constants of the metal complex with the different ligands, and of the complexes of a particular ligand with different metal ions is also proposed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 73
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1971), S. 329-331 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und IR-Spektren von SnIV-Komplexen mit Acridin und Piperazin werden beschrieben und ihre Strukturen vorgeschlagen.
    Notes: Preparation and I.R. spectra of tin(IV) chloride complexes with acridine and piperazine have been described and their structures have been suggested.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 74
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971) 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 75
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 1-6 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The cathodic reduction of cobalt salts in presence of butadiene gives linear oligomers. The oligomerisation is probably independent of the nature of the reducing agent. The presence of phosphines and phosphites in electrolysis of cobalt-tris-acetylacetonate/butadiene mixtures mostly prevent linear dimerisation of butadiene.
    Notes: Die kathodische Reduktion von Kobaltsalzen in Gegenwart von Butadien führt zu linearen Dimeren. Der Oligomerisierungsverlauf ist offensichtlich unabhängig von der Natur des Reduktionsmittels. Die Anwesenheit von Phosphinen und Phosphiten bei der Elektrolyse von Kobalt-tris-acetylacetonat in Butadiengemischen führt weitgehend zur Unterdrückung der linearen Dimerisierung von Butadien.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 76
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 16-22 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cadmium bromide reacts in anhydrous acetic acid solutions with acetyl bromide to form bromocadmates which can be precipitated as ammonium salts. By conductometric control and X-ray diffraction the phases (NH4)(CdBr3), (NH4)2 (CdBr4) and (NH4)4(CdBr6) have been found which decompose on heating as ordinary double salts to ammonium bromide and cadmium bromide.
    Notes: Cadmiumbromid reagiert in wasserfreier Essigsäurelösung mit Acetylbromid zu Bromocadmaten, die als Ammoniumsalze ausgefällt werden können. Durch konduktometrische Kontrolle und Röntgenbeugungsversuche sind die Phasen (NH4)(CdBr3), (NH4)2 · (CdBr4) und (NH4)4(CdBr6) aufgefunden worden, die sich in der Hitze als einfache Doppelsalze zu Ammoniumbromid und Cadmiumbromid zersetzen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 77
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 380 (1971), S. 23-29 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrazinium monochloride disproportionates on interaction with diphenyl-trichlorophosphorane, giving N2 and [(C6H5)2P(Cl)—N—PCl(C6H5)2]Cl. The phosphinazine dihydrochloride [(C6H5)2PCl—NH—NH—PCl(C6H5)2]Cl2 is obtained according to equation (4). The preparation of the P—N five-ring compound X, formulated in „Inhaltsübersicht“, is described.
    Notes: Beim Umsatz von Diphenyltrichlorphosphoran mit Hydraziniumhydrochlorid disproportioniert dieses, es wird [(C6H5)2PCl—N—PCl(C6H5)2]Cl (III) und N2 gebildet. Zum Phosphinazindihydrochlorid [(C6H5)2PCl—NH—NH—PCl(C6H5)2]Cl2 gelangt man auf dem durch (4) beschriebenen Weg. Die Darstellung des P und N enthaltenden Fünfrings X wird beschrieben.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 78
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 249-254 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,5-Bis(alkylamino)octamethyltrisildiazanes react after metallation with element dichlorides according to reaction 3a and 3b respectivcly by forming ring compounds. In this way 1,2,8-organylsubstituted permethylated cyclotetrasilazanes (I, II) and inorganic eightmembered ringsystems BSi3N4. PSi3N4 and GeSi3N4, were prepared for the first time.
    Notes: 1,5-Bis(alkylamino)oktamethyltrisildiazane reagieren nach Metallierung mit Elementdichloriden über Rk. 3a oder 3 b unter Ringschluß. Neben 1,2,8-organylsubstituierten, permethylierten Cyclotetrasilazancn (I, II) ließen sich so erstmalig anorganische Achtringsysteme BSi3N4. PSi3N4 und GeSi3N4 darstellen.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 79
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 272-278 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkyl zirconium trihalides can be prepared from zirconium tetrachloride or tetrabromide and zinc dialkyls in toluene as a solvent. Using pyridine, dialkyl zirconium dihalides are formed. Some of these new organozirconium compounds are isolated and characterised in form of complexes with bipyridyl.
    Notes: Zirkoniumtetrachlorid und -bromid lassen sich in Toluol als Lösungsmittel durch Zinkdialkyle in Alkylzirkoniumtrihalogenide überführen. In Pyridin als Reaktionsmedium entstehen dagegen Dialkylzirkoniumdihalogenide, von denen einige als definierte Dipyridylkomplexe isoliert und charakterisiert werden konnten.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 80
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 263-271 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In mixtures of 7 vol. acetonitrile and 3 vol. acetic acid, solutions or suspensions of copper(II) acetate can be reduced with hydrazine hydrate to solutions of copper(I) acetate. In this way, purely white copper(I) acetate can be isolated.Other copper(I) carboxylates can be prepared by reduction of copper(II) carboxylates or by reaction of solid carboxylic acids with copper(I) acetate.By adding acetyl chloride to solutions of copper(I) acetate in acetonitrile/acetic acid mixtures, solutions of chlorocuprates(I) are formed. From these, highly pure copper(I) chloride can be obtained.By adding alkali acetate or tetramethyl ammonium chloride to solutions of chlorocuprates(I), the pure compounds Cs3[Cu2Cl5], Rb2[CuCl3] and NMe4[Cu2Cl3] were obtained.
    Notes: In Mischungen von 7 Vol. Acetonitril und 3 Vol. Essigsäure lassen sich Lösungen oder Suspensionen von Kupfer(II)-acetat mit Hydrazinhydrat zu Kupfer(I)-acetat-Lösungen reduzieren. Daraus kann rein weißes Kupfer(I)-acetat isoliert werden. Weitere Kupfer(I)-carboxylate können analog durch Reduktion der Kupfer(II)-carboxylate oder durch doppelte Umsetzung einer festen Carbonsäure mit Kupfer(I)-acetat dargestellt werden. Bei Zugabe von Acetylchlorid zu Lösungen von Kupfer(I)-acetat in Acetonitril/Essigsäure-Mischungen entstehen Lösungen von Chlorocupraten(I). Daraus kann reinstes Kupfer(I)-chlorid gewonnen werden.Bei Zugabe von Alkaliacetat bzw. Tetramethylammoniumchlorid zu Chlorocuprat(I)-Lösungen werden Chlorocuprate(I) der Zusammensetzung Cs3[Cu2Cl5, Rb2[CuCl3] und NMe4[Cu2Cl3] in reiner Form erhalten.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 81
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 293-302 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A method for analyzing the data measured with a differential heat flow calorimeter is presented. For first order reactions, the enthalpies of reaction and the rate constants can be determined in a simple way using the continuously recorded temperature-time diagram of the calorimeter. In general, this method of analysis is especially suitable to investigate reactions with a slow rate of heat generation.
    Notes: Es wird über ein Auswertungsverfahren für Messungen mit einem Differential-Wärmeflußcalorimeter berichtet. Aus den kontinuierlich registrierten Temperatur-Zeit-Kurven des Calorimeters lassen sich bei Reaktionen 1. Ordnung in einfacher Weise Reaktionsenthalpien und Geschwindigkeitskonstanten bestimmen. Allgemein ist das Verfahren besonders zur Untersuchung von Reaktionen mit zeitlich kleiner Wärmeproduktion geeignet.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 82
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 124-130 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dimethyl-diphenyl and dimethyl-dibenzyl-silane react in liqu. NH3 in the presence of KKH2 giving rise to the formation of H2N—Si(Me2)—NH—Si(Me3)—NHK (III); exclusively C6H5 and C6H5CH2 are split off and substituted by NH2. Reaction of the potassium compound III with the equivalent amount of NH4Cl brings about a mixture of octamethylcyclotetrasilazane and hexamethylcyclotrisilazane.
    Notes: Dimethyl-diphenyl- und Dimethyl-dibenzyl-silan reagieren in flüss. NH3 in Gegenwart von KNH2 (Molverhältnis 1:0,55) unter Bildung von H2N—Si(Me2)—NH—Si(Me2)-NHK(III). Hierbei werden ausschließlich C6H5 als C6H6 und C6H5CH2 als Toluol abgespalten. Wird die Kaliumverbindung III mit der äquivalenten Menge NH4Cl in flüss. NH3 umgesetzt, so wird ein Gemisch von Octamethylcyclotetrasilazan und Hexamethylcyclotrisilazan erhalten.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 83
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 136-146 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: This study is concerned with the base component of some biological important macrocycles, with pyrrole and its coordination behaviour towards chromium. In etheral solutions, after treatment with alkali- (Li, Na, K) or GRIGNARD-pyrrolyl reagent, the halides of Cr(II) and Cr(III) gave pyrrolylchromium compounds with a metal-to-nitrogen bond. This is confirmed by the chemical and physical properties of binary and coordination compounds and Cp-derivatives. Apart of this N-pyrrolyl bonding, some examples of C-pyrrolychromium compounds were prepared from 1-methyl-2-lithiumpyrrolyl. To prevent hydrolysis and oxidation, working under an inert atmosphere was necessary.
    Notes: In Diäthyläther oder Tetrahydrofuran reagieren Alkali (Li Na, K)- und GRIGNARD-Pyrrolyle mit den Halogeniden des zwei- und dreiwertigen Chroms. Es werden Darstellung und Eigenschaften einer Anzahl von Komplexverbindungen beschrieben, die sich durch eine kovalente Bindung zwischen Chrom und dem Stickstoffatom des Fünfring-Heterocyclus auszeichnen. Neben diesen N-Pyrrolylverbindungen sind C-Pyrrolyl-Verbindungen synthetisiert worden aus den Chromchloriden und 1-Methyl-2-lithium-pyrrolyl. Die Substanzen sind empfindlich gegenüber Luft und Feuchtigkeit.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 84
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 169-176 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reaction between graphite and SbF3 in Cl2 atmosphere or SbF3Cl2in inert atmosphere gives antimony fluoride-chloride graphite compounds. The first intercalation stage is deep blue and contains 67-68% SbFxCly. The ideal composition is near [C27]GrSbF3Cl2 · 2 SbF3Cl2. SbF3Cl2 can be substituted partly by SbF3 or SbF5. The layer distance decreases with increasing F:Cl ratio from 8.87 to 8.36 Å. There exist also a second and third intercalation stage.
    Notes: Graphit reagiert mit SbF3 in einer Cl2-Atmosphäre oder direkt mit SbF3Cl2 in inerter Atmosphäre unter Bildung von Antimonfluoridchlorid-Graphitverbindungen. Die 1. Stufe ist tief dunkelblau und enthält maximal 67-68% SbFxCly. Die Idealzusammensetzung liegt bei [C27]+GrSbF3Cl2 · 2SbF3Cl2. Ein Teil des eingelagerten SbF3Cl2 kann durch SbF3 oder SbF5 ersetzt werden. Der Schichtabstand geht mit steigendem F: Cl-Verhältnis von 8,87 Å bis auf 8,36 Å zurück. Es existieren auch eine 2. und 3. Stufe.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 85
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971) 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 86
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 202-210 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Of the new iodine(VII) compounds HOIOF4 and IO2F3 the preparation and chemical and physical properties are reported. According to the 19F nuclear magnetic resonance spectra, both exist in two non-separable isomeres. HOIOF4 is a very strong acid. IO2F3 forms yellow needles, which are not wetted by water. Both are very strong oxidising species. IO2F3 is probably the first trigonal-bipyramidal molecule with two simultaneously existing isomeres.
    Notes: Die Darstellung und die wichtigsten chemischen und physikalischen Eigenschaften der beiden neuen Verbindungen HOJOF4 und JO2F3 werden berichtet. Wie die 19F-Kernresonanzspektren zeigen, liegen beide Verbindungen in je zwei, wahrscheinlich nicht trennbaren isomeren Formen nebeneinander vor. HOJOF4 ist eine sehr starke Säure. JO2F3 bildet gelbe Nadeln, welche durch Wasser nicht benetzt werden. Beide Verbindungen sind infolge ihres ungewöhnlichen Oxydationsvermögens sehr aggressive Substanzen. Das JO2F3 ist interessant als vermutlich das einzige trigonal-bipyramidale Molekül, bei dem der intra- bzw. intermolekulare Ligandenaustausch genügend langsam verläuft, um beide isomere Formen nebeneinander nachweisen zu können.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 87
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 211-220 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stoichiometric mixture of powders BaO/WO3, Ba(OH)2/WO3, BaCO3/WO3, BaSO4/WO3 are grinded in a vibrating mill. IR spectra, X-rays diffractions, DTA, TGA. investigation of conductivity and solubility show that - 100% of BaWO4 arise from BaO/WO3 after grinding 5 hours in a vibrating mill,- the degree of interaction decreases in the sequence BaO—Ba(OH)2—BaCO3—BaSO4 corresponding to ΔR G °,- no tribochemical reaction BaSO4/WO3 occurs.
    Notes: Die stöchiometrischen Pulvergemische BaO/WO3, Ba(OH)2/WO3, BaSO3/WO3 und BaSO4/WO3 werden in einer Sehwingmühle gemahlen. IR-Spektren, Röntgen-Goniometeraufnahmen, DTA, TGA, Leitfähigkeits- und Löslichkeitsuntersuchungen zeigen, daß - aus BaO/WO3 nach einer Schwingmahldauer von fünf Stunden 100% BaWO4 entstehen.- der Umsatzgrad in der Reihenfolge BaO — Ba(OH)2—BaCO2—BaSO4 entsprechend den ΔRG°-Werten abnimmt.- BaSO4/WO3 tribochemisch nicht reagieren.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 88
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 231-234 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A method for the preparation of magnesium silicide by fusing magnesium and silicon at a temperature of 1100°C in an induction furnace under an atmosphere of argon is reported. By using feed charges of 30 kg the melting loss of magnesium can be reduced. The homogeneity of the resulting stoichiometric Mg2Si was proved by means of an electron beam microprobe.
    Notes: Es wird über ein Verfahren zur Darstellung von Magnesium-silicid durch Zusammenschmelzen von Magnesium und Silicium bei 1100°C unter Argon in einem Induktionsofen berichtet. Bei Verwendung von 30 kg Chargen kann der Magnesiumabbrand klein gehalten werden. Die Homogenität des erhaltenen stöchiometrischen Mg2Si wurde mittels einer Elektronenstrahl-Mikrosonde überprüft.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 89
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 255-259 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ammonium-, Natrium-, Hexamminkobalt (III) und Åthylendiaminium-dioxofluorovanadat(V), MIVO2F2. wurden dargestellt und durch Röntgenpulveraufnahmen, IR-Spektrum und im Falle des NH4-Salzes-Thermogravimetrie charakterisiert.
    Notes: The syntheses of ammonium, sodium, hexamminecobalt(III) and ethylene-diamine dioxodifluorovanadate(V), MIVO2F2, are reported. Their x-ray powder diffraction data are different from those of the corresponding tetrafluoroborates and perchlorates. Their infrared spectra have been recorded (700-4000 cm-1), and probable band assignments made. The ammonium dioxodifluorovanadate has been studied through thermogravimetry, and the composition of an intermediate product is discussed from its chemical analysis and infrared spectrum.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 90
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 305-305 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 91
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 385 (1971), S. 209-229 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The position of the Kα1,2 band in the X-ray spectra of Mg2+ in oxides and silicates is, to a minor extent, dependent on the coordination number of Mg, the Mg—O distance, and the orientation of the O2- ligands in relation to the 2p orbitals of Mg.There is a splitting of the Kβ band of Mg for four- and six-coordination; no splitting occurs for the case of eight-coordination. There is evidence that in the [MgO4] and [MgO6] polyhedra some of the πb orbitals, derived from the 3b terms, are at lower energetic position than the πb orbitals, derived from the 3p terms.
    Notes: Die Lage der Kα1,2-Bande von Mg2+ in Oxiden und Silicaten ist in geringem Maße abhängig von der Koordinationszahl, von dem Mg—O-Abstand und der Orientierung der O2--Liganden in Bezug auf die Mg 2p-Orbitale.Die Mg Kβ-Bande zeigt bei 4- und 6-Koordination eine Aufspaltung. Bei 8-Koordination tritt keine Aufspaltung auf. Mit Hilfe der molecular-orbital-Theorie läßt sich eine Zuordnung der Teilbanden treffen. Es ergeben sich Hinweise darauf, daß im [MgO4]- und [MgO6]-Polyeder einige der aus den 3d-Zuständen hervorgegangenen πb-Orbitale energetisch tiefer liegen als die πb-Orbitale aus den 3p-Zuständen.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 92
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 177-183 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The hydrogen peroxide cleavage of benzil is specifically catalyzed by sodium silicate in aqueous t-butyl alcohol solutions at 45°C and pH 〉 7. The catalytic effect of silicate is correlated with the equilibrium formation of peroxosilicate species from silicate and H2O2.
    Notes: Die Spaltung von Benzil durch Wasserstoffperoxid wird in 35% tert.-Butanol/65% Wasser bei 45°C und pH-Werten 〉 7 durch Natriumsilicat spezifisch katalysiert. Dieser Effekt wird als Hinweis auf die Existenz von Peroxosilicat-Spezies im Gleichgewicht mit Silicat und H2O2 gewertet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 93
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 191-192 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Consecutive reactions of artinite (MgCO3 ·Mg(OH)2 · 3 H2O) into magnesite (MgCO3) through hydromagnesite (4MgCO3 Mg(OH)2 · 4 H2O) were studied directly by an X-ray diffraction method under hydrothermal conditions using a micro autoclave results were discussed from the point of kinetic analysis. Both reactions from artinite to hydromagnesite and from hydromagnesite to magnesite were of first order with apparent activation energies 21 kcal/mol, 12 kcal/mol respectively.
    Notes: Die Umwandlungen des Artinits (MgCO3 · Mg(OH)2 · 3 H2O) in den Hydromagnesit (4 MgC03 · Mg(OH)2 · 4 H2O) und weiter in den Magnesit (MgCO3) wurden röntgenographisch unmittelbar unter hydrothermalen Bedingungen in einem Mikro-Autoklaven untersucht und kinetisch analysiert. Beide Reaktionen sind von erster Ordnung; Aktivierungsenergien: etwa. 21 kcal/Mol bzw. 12 kcal/Mol.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 94
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 226-230 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: For the storage of raw silane and silane isomeres isolated by distillation or gaschromatographic separation, 40 Mn 4-steel vessels are proposed. A metallographic analysis of a steel vessel containing silanes over a period of six years shows only a small partiel decarbonization of the material up to a depth of 200-250 μm. Decomposition of the silane was not observed.
    Notes: Zur Aufbewahrung von Rohsilan und von durch Destination oder gaschromatographische Trennung isolierten Silanisomeren werden Behälter aus 40Mn 4-Stahl vorgeschlagen. Wie metallkundliche Untersuchungen an einem sechs Jahre mit Silanen gefüllten Stahlgefäß zeigen, findet nur eine geringe partielle Entkohlung des Stahls bis zu einer Schichtdicke von 200-250 μm. statt. Eine Zersetzung des Silans wurden nicht beobachtet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 95
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 235-250 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: CS2 forms with BaSe in aqueous solution the compound BaCS2Se. The reaction of CSe2 with BaS leads to mixed crystals of BaCSSea and BaCSe3. The compounds were investigated by chemical, X-ray and IR-spectroscopical methods. Assignments of all normal vibrations of the ions CS2Se2- and CSSe2-2 were possible. The conductivity of CS2Se2- in aqueous solution was determine. By interaction of BaCS2Se with HCl the acid H2CS2SE (red oil) was prepared in form of its S, Se-protonated isomer; fast decomposition to H2 Se and CS2 occurs. From conductivity measurements it is concluded that the decomposition of H2CS2Se in aqueous solution is a first-order reaction via the anion HCS2Se-. Half-lifes and activation energy are given. The dissociation constants Ka1 and Ka2 were determind and thermodynamic data of the dissociation calculate. Date see „Inhaltsübersicht“.
    Notes: CS2 reagiert in wäßriger Lösung mit BaSe zu BaCS2Se (d425 = 3,73 ± 0.01 g/ml). CSe2 ergibt mit BaS stets nur Mischkristalle von BaCSSe2 und BaCSe3. Die Charakterisierung erfolgte chemisch, röntgenographisch und IR-spektroskopisch. Im IR-Spektrum konnte für die Ionen CS2Se2- und CSSe2-2 jeweils eine vollständige Zuordnung aller bei C2v-Symmetrie zu erwartenden 6 Grundschwingungen erfolgen.Die Äquivalentleitfähigkeit des CS3Se2--Ions in wäßriger Lösung läßt sich durch die Tempersturfunktion (in cm2 · Ω-1 · g-Äqu.-1; T in °K) \documentclass{article}\pagestyle{empty}\begin{document}$$ \Lambda _0^{\rm T} \left( {{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}{\rm CS}_{\rm 2} {\rm Se}^{{\rm 2} - } } \right) = - 378,5 + 1,60\;{\rm T} $$\end{document} beschreiben. Bei 25°C wurde der STOKESsche Radius zu rs = 1,86 Å, der Radius des hydratisierten Ions zu rHydr. = 3,60 Å und der Grenzwert des Diffusionskoeffizienten zu D0 = 1,32 · 10-5cm2 sec-1 berechnet. BaCS2Se reagiert mit halbkonzentrierter Salzsäure bei 0°C zur Säure H2CS2Se (rotes Öl), ein vorwiegend S,Se-protoniertes Isomeres SC(SH)(SeH), das schnell in H2Se und CS2 zerfällt. Leitfähigkeitsmessungen zwischen --1 und 2°C ergaben, daß der Zerfall des H2CS2 in wäßriger Lösung formal nach einem Geschwindigkeitsgesetz 1. Ordnung und über das Hydrogenanion erfolgt. Die Halbwertszeiten liegen im angegebenen Temperaturbereich unter 5 sec; formale Aktivierungsenergie des Zerfalls ΔHA = 58 ± 5 kcal/Mol. Die Leiden Dissoziationskonstanten der Säure H2CS2Se betragen \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm K}_{{\rm 31}} \left( {0{}^\circ {\rm C}} \right) = \left( {1,2 \pm 0,5} \right) \cdot 10^{ - 5}\quad {\rm und}\quad\rm{K}_{{\rm 32}} \left( {25{}^\circ {\rm C}} \right) = \left( {1,0 \pm 0,3} \right) \cdot 10^{ - 11} $$\end{document} Die thermodynamischen Funktionen der 2. Dissoziationsstufe wurden im Temperaturbereich 0-25°C ermittelt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 96
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 280-286 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden gelbe Fe III-Komplexe mit Atromilchsäure sowie α-Hydroxy-isobuttersäure isoliert und spektrophotometrisch charakterisiert. Die Gleich-gewichtskonstanten und thermodynamischen Parameter (- ΔG, ΔH, ΔS) der Komplexe wurden ermittelt.
    Notes: Atrolactic as well as α-hydroxyisobutyric acids form yellow 1:1- complexes with iron(III) which could be isolated. The nature of the complexes has been studied spec-trophotometrically. The equilibrium constants as well as the thermodynamic parameters, e.g. - ΔG, ΔH, ΔS, of the complexes have been evaluated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 97
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 385 (1971), S. 123-130 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Liquid diphosphine and hydrogen fluoride react vigorously to yield phosphine, PH3, and polyphosphine, (PH)n. If the mole ratio HF/P2H4 is extremely high, difluorophosphorane, H3PF2, may be isolated. The new compound was characterized by its mass, IR and PMR spectrum.
    Notes: Als Flüssigkeiten reagieren Diphosphin und Fluorwasserstoff sehr heftig miteinander unter Bildung von Monophosphin (bzw. Phosphoniumhydrogenfluorid) und polymerem, festem Phosphorwasserstoff, (PH)n. Wenn das Molverhältnis HF/P2H4 extrem groß gewählt wird, läßt sich als Reaktionsprodukt Difluorphosphoran H3PF3 isolieren. Die neue Verbindung wurde durch ihr Massen-, IR- und PMR-Spektrum charakterisiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 98
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 385 (1971), S. 137-141 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chromium(V) fluoride reacts at 120°C with xenon or xenon difluoride yielding xenon difluoride or xenon tetrafluoride, respectively, whereas chromium(V) fluoride is reduced into chromium(III) fluoride. When chromium(V) fluoride is reacted with excess xenon difluoride at 60°C a nonvolatile solid of the composition XeCr2F10 is formed besides xenon tetrafluoride.
    Notes: Bei den Untersuchungen der Reaktionen zwischen Chrom(V)-fluorid und Xenon odor Xenondifluorid bei 120°C wurde die Reduktion von Chrom(V)-fluorid in Chrom(III)-fluorid festgestellt, wobei sich Xenon bzw. Xenondifluorid zu den entsprechenden Fluoriden oxydierten. Bei der Reaktion zwischen Chrom(V)-fluorid und überschüssigem Xenondifluorid bei 60°C bildet sich neben Xenontetrafluorid ein nicht-flüchtiges Produkt, welches der Bruttoformel XeCr2F10 entspricht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 99
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The crystal structures of the compounds (I) and (II) (see Inhaltsübersicht) and of the compound (III), formed by ligand exchange from (II), are determined. The complex anions ([Nb6X12]Y6)2- occupy the corners of a nearly regular cubus which contains, in its centre, two PyH+ cations with mutual parallel orientation. The bond lengths Nb-Nb are 3,032-3,072 Å (corresponding to 14 e/Nb6). In the course of the thermal transformation (II) (III) six Cla-atoms are exchanged by six Bri-atoms in two trigonal planes of the single clusters. Details of structure and ligand exchange are elucidated.
    Notes: Die Strukturen der Verbindungen (PyH)2[Nb6Cl12i]Cl6a (I) und (PyH)2[Nb6Br12i]Cl6a (II) und der durch Ligandenaustausch aus (II) entstandenen Verbindung (PyH)2[Nb6Br12iCl12i]Br6a(III) wurden bestimmt [Py = C5H5N]. Komplexe Anionen ([Nb6X12]Y6)2- besetzen die Eckpunkte eines nahezu regulären Würfels, in dessen Mitte zwei (PyH)+-Kationen planparallel übereinander liegen. Die Nb-Nb-Abstände betragen 3,032-3,072 Å (entsprechend 14 e/Nb6). Bei der thermischen Umlagerung (II) (III) werden sechs Cla-Atome gegen sechs Bri-Atome innerhalb von zwei trigonalen Ebenen der einzelnen Cluster ausgetauscht. Einzelheiten der Strukturen und des Ligandenaustauschs werden diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 100
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 73-86 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reaction of zinc halides (ZnCl2, ZnBr2) or Zn(BH4)2 with LiBH4 or NaBH4 in ether or tetrahydrofurane yields LiZn(BH4)3, Li2Zn(BH4)4 or NaZn(BH4)3 respectively. The latter complex is also obtained by the reaction of NaZn(OCH3)3 or Na2Zn(OCH3)4 with diborane. Octakis(tetrahydridoborato)-trizincate K2Zn3(BH4)8 and BaZn3(BH4)8 are formed by treating Zn(BH4)2 with KBH4 or Ba(BH4)2.The 11B-nmr- and ir-spectra of the new complexes are recorded and discussed in terms of double hydrogen bridge bonding of BH4 groups to the central zinc atom.
    Notes: Die Umsetzung von Zinkhalogeniden (ZnCl2, ZnBr2) bzw. Zinkboranat (Zn(BH4)2) mit LiBH4 oder NaBH4 in Äther oder Tetrahydrofuran liefert LiZn(BH4)3, Li2Zn(BH4)4 bzw. NaZn(BH4)3. Natriumtriboranatozinkat fällt auch bei der Reaktion von NaZn(OCH3)3 oder Na2Zn(OCH3)4 mit Diboran an. KBH4 und Ba(BH4)2 reagieren mit Zn(BH4)2 zu den Octaboranatotrizinkaten K2Zn3(BH4)8 und BaZn3(BH4)8.Die 11B-Kernresonanz- und IR-Spektren der neuen Komplexverbindungen werden diskutiert. Danach sind die BH4-Gruppen über zwei Hybridwasserstoffatome an das Zinkatom gebunden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...