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1

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Histopathology of otitis media with effusion (1986)

Tanaka, K. ; Saito, J. ; Ohashi, M. ; [et al.]

Springer

European archives of oto-rhino-laryngology and head & neck 243 (1986), S. 269-273

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ISSN: 1434-4726

Keywords: Otitis media with effusion ; Electron microscopy ; Human temporal bones

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Ultrastructural studies of the middle ear mucosa appear to be of significant value in better understanding the pathology of otitis media with effusion (OME). Our present study was undertaken in order to take advantage of the use of electron microscopy in investigating all areas of the middle ear mucosa. Tissues studied were obtained from the fresh postmortem temporal bones of three patients with OME and terminal head and neck malignancies. In the mucoid type of effusion (cases 1 and 2), goblet cells were seen to proliferate and secretory activity was greatly enhanced. In contrast, there was no evidence of secretory cell proliferation in the serous type of effusion. It was noteworthy that accumulated fluid was not homogeneous in the same ear, as exemplified by case 1, in which both mucoid and serous effusions were present. This occurrence was possibly the result of topographic diversity involving the secretory activity of the middle ear.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00464444

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2

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Experimental tympanosclerosis following infection with Streptococcus pyogenes and vitamin D3 intoxication (1986)

Mann, W.

Springer

European archives of oto-rhino-laryngology and head & neck 243 (1986), S. 296-303

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ISSN: 1434-4726

Keywords: Experimental tympanosclerosis ; Induced calcifications ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary A rat animal model was used to study the ultrastructure of submucosal calcifications induced in the middle ear following inoculation with Streptococcus pyogenes and high doses of parenteral vitamin D3. The morphological changes present in affected animals resembled the classical picture of tympanosclerosis. While calcification occurred about bacterial remnants and myelin structures, the most important calcification centers were lysosomal and non-lysosomal matrix vesicles in the extracellular spaces. These formed band-like calcifications close to the basal membrane without affecting the epithelial layer. This animal model offers the possibility of studying the effect of various therapeutic regimens in the treatment of the dynamic tympanosclerotic process.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00460205

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3

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Heterogeneity of circular mitochondrial DNA molecules from sugar beet with normal and male sterile cytoplasms (1986)

Mikami, Tetsuo ; Harada, Takeo ; Kinoshita, Toshiro

Springer

Current genetics 10 (1986), S. 695-700

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ISSN: 1432-0983

Keywords: Sugar beet ; Cytoplasmic male sterility ; Mitochondrial DNA ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Mitochondrial (mt) DNAs from normal (N) and male sterile (S) cytoplasms of sugar been have been isolated and investigated by electron microscopy. The results showed that mtDNA was composed of a heterogeneous population of circular molecules. Their contour lengths varied from 0.28 to 51 μm, but unlike in the case of maize, a large difference was not observed in the distribution of molecular classes greater than 1.0 μm between N and S cytoplasms of sugar beet. On the other hand, N and S cytoplasms were shown to contain their own characteristic combinations of small circular mtDNA species with lengths between 0.28 μm and 0.6 μm. Mitochondrial DNAs from various sources of male-sterile cytoplasms were analyzed by agarose gel electrophoresis to determine the extent of cytoplasmic variation. Additional low molecular weight DNA bands appeared in all male-sterile lines examined, and as a result, three distinctive banding patterns were recognized. These data are in general agreement with those based upon restriction endonuclease digestion of mt and chloroplast DNAs and the genetic analysis of fertility restoration in test crosses.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00410918

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4

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Alpha-subunit-producing pituitary adenomas (1986)

Landolt, Alex M. ; Heitz, Philipp U.

Springer

Virchows Archiv 409 (1986), S. 417-431

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ISSN: 1432-2307

Keywords: Pituitary neoplasms ; Pituitary hormones ; Immunocytochemistry ; Electron microscopy ; Alpha-subunit ; Acromegaly

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Immunohistological techniques demonstrate the alpha-subunit of glycoprotein hormones in the majority of endocrine-inactive, undifferentiated pituitary adenomas and pituitary oncocytomas. In about one-fifth of endocrine-active adenomas, the alpha-subunit is produced in combination with either adrenocorticotropic hormone or prolactin, and it is found in combination with growth hormone in about half of those adenomas causing acromegaly. Pure alpha-subunit-producing, endocrine-inactive adenomas characteristically have small secretory granules that are destroyed by direct osmium fixation, but are well preserved after prefixation with glutaraldehyde. As only a few atypical prolactinomas show similar secretory granules, and as they display a positive reaction for the alpha-subunit only exceptionally, this ultrastructural feature can serve as a guide to differentiate such adenomas.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00705414

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5

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Frequency and diagnostic value of the virus-like filamentous intranuclear inclusions in giant cell tumor of bone, not associated with Paget's disease (1986)

Abelanet, René ; Daudet-Monsac, Monique ; Laoussadi, Saddek ; [et al.]

Springer

Virchows Archiv 410 (1986), S. 65-68

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ISSN: 1432-2307

Keywords: Giant-cell ; Virus-like inclusion ; Intranuclear inclusion ; Giant cell tumour of bone ; Paget's disease of bone ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary This paper deals with the paramyxovirus-like intranuclear inclusions observed in giant cells tumours of bone (GCTB). Twenty-one (49%) of 43 cases of GCTB (1977–1985), either fresh and/ or cultured, show these ultrastructural inclusions. Fifty samples of various bone lesions in which giant cell lesions occurred, including aneurysmal cysts, hyperparathyroidism, osteoblastoma, human and rat osteopetrosis, GCT of tendon sheaths, and non skeletal granuloma were used as controls. These, together with 20 samples of normal bone (osteoclasts) did not contain intranuclear or intracytoplasmic viral inclusions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00710907

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6

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Effects of experimental torsion of the spermatic cord on Leydig cell function in the guinea pig testis: An ultrastructural stereological analysis (1986)

Hikim, A. P. Sinha ; Chakraborty, J. ; Jhunjhunwala, J. S.

Springer

Urological research 14 (1986), S. 253-256

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ISSN: 1434-0879

Keywords: Guinea pig ; Spermatic cord torsion ; Stereology ; Electron microscopy ; Leydig cell

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary An ultrastructural stereological analysis of Leydig cells of the guinea pig testis was carried out following surgically induced testicular torsion. Morphometric analyses of the Leydig cells of the experimental group of animals revealed an increase in the nucelar and mitochondrial volume and a decrease in the lipid volume, in comparison to those in the Leydig cells of the control group of animals. We believe that these changes in the Leydig cells of the experimental group of animals are indicative of cellular hypertrophy. The possible mechanisms of the Leydig cell hypertrophy in the guinea pig testis following the induction of spermatic cord torsion are discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00256568

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7

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Ultrastructural abnormalities in muscular vessels of hyperthyroid patients (1986)

Finol, H. J. ; Müller, B. ; Torres, S. H. ; [et al.]

Springer

Acta neuropathologica 71 (1986), S. 64-69

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ISSN: 1432-0533

Keywords: Muscular diseases ; Capillar pathology ; Grave's disease ; Hyperthyroidism ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary an electron microscope study of needle biopsies from the quadriceps muscle was carried out in 11 non=selected patients (ten females and one male), with clinically and laboratory-diagnosed hyperthyroid disease. Alterations of the normal structure of muscle fibres were found in all cases. Changes in capillaries were found in ten patients, and ranged from an increase in basement membrane thickness with reduplication, to total destruction of the capillaries. The importance of the vascular involvement in the muscles of patients with Graves-Basedow disease is stressed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00687963

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8

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Proliferating potential of folliculo-stellate cells in human pituitary adenomas (1986)

Iwaki, T. ; Kondo, A. ; Takeshita, I. ; [et al.]

Springer

Acta neuropathologica 71 (1986), S. 233-242

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ISSN: 1432-0533

Keywords: Folliculo-stellate cell ; Pituitary adenoma ; Glial fibrillary acidic protein ; S-100 protein ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Folliculo-stellate cells (FS cells) in 40 pituitary adenomas and portions of anterior pituitary adjacent to the tumor in 26 cases were investigated immunohistochemically, using polyclonal antisera to S-100 protein (S-100) and glial fibrillary acidic protein (GFAP). The objective was to clarify the histological behavior of the FS cells. In most pituitary adenomas there were few or no S-100-or GFAP-positive cell, in comparison with numerous positive cells in the parts of the adenohypophyses compressed by adenomas. However, positive FS cells were observed in some types of pituitary adenomas. Growth hormone and prolactin producing adenomas frequently contained significant amounts of FS cells. In non-functioning adenomas, an unique case of FS cell adenoma was present. The adenoma was composed mainly of FS cells and immature glandular cells. The FS cells were sometimes located around follicles containing Periodic acid Schiff-positive material. Therefore, the FS cell adenoma is characterized by S-100- and GFAP-positive FS cells and PAS-positive follicles. In this type of adenoma, FS cells seemed to be the main proliferating component. In parts of the adenohypophyses adjacent to the adenomas, GFAP0-positive FS cells were numerous. In the pathological conditions FS cells may possess the potential of reactive proliferation.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00688045

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9

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The distribution of Ia antigen in the lesions of rat acute experimental allergic encephalomyelitis (1986)

Vass, K. ; Lassmann, H. ; Wekerle, H. ; [et al.]

Springer

Acta neuropathologica 70 (1986), S. 149-160

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ISSN: 1432-0533

Keywords: Ia antigen ; Central nervous system ; Experimental allergic encephalitis ; Immunohistochemistry ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Ia antigen, encoded within the major histocompatibility complex, plays an important role in the activation of T lymphocytes. Since experimental allergic encephalitis is an essentially T cell-mediated disease, Ia antigen in the central nervous system (CNS) may be pathogenetically relevant. The occurrence of Ia antigen in the CNS of normal rats and of rats with experimental allergic encephalitis was studied by light and electron microscope immunocytochemistry using the monoclonal anti-Ia antibodies Ox 4 and Ox 6. In normal, unsensitized animals a distict population of stellate cells in the meninges and some perivascular mononuclear cells in the nervous tissue carried Ia antigen. In rats with experimental allergic encephalitis a dramatic increase of Ia-positive cells was found. In addition to the positive cells found in normal animals, monocytes, macrophages and many lymphocytes in the meningeal perivascular and parenchymal inflammatory infiltrates as well as “activated microglia” stained for Ia antigen. We did not find evidence for Ia expression on endothelial cells, astrocytes or other components of the CNS in either normal or diseased rats.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00691433

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10

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Transplantation of Pacinian corpuscles of the rat into the brain (1986)

Jirmanová, I. ; Zelená, J.

Springer

Acta neuropathologica 69 (1986), S. 314-321

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ISSN: 1432-0533

Keywords: Pacinian corpuscles ; Transplantation to the brain ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary In adult inbred rats of the AVN strain, branches of the crural interosseous nerve were dissected out from donors and transplanted into the brain of recipients, together with a cluster of Pacinian corpuscles, (either into a suction cavity or the cerebral cortex) into a slit 1–2 mm deep. The grafts were fixed and processed for electron microscopy 10 days to 6 months after the operation, and their ultrastructure was examined. Sporadic axons of small diameter grew into the nerve branches of some of the grafts from 11 days onward, and became myelinated during the 2nd month after the operation, but none of the transplanted Pacinian corpuscles became reinnervated. The corpuscles, however, survived denervation and grafting. Most of them retained a well-preserved inner core and an intact capsule, consisting of a normal complement of 29.2±1.0 (mean ±SE) capsular layers (n=8), as did the corpuscles previously examined after denervation in situ. Some of the corpuscles underwent degenerative changes, presumably due to a delayed or restricted revascularization. In this group of corpuscles, the inner core underwent disintegration and was gradually replaced by collagen fibrils, whereas the capsule remained preserved but the number of its layers eventually reduced by 40%. It is assumed that the lack of reinnervation of the grafted Pacinian corpuscles was due to the paucity of regenerating axons, and their failure to form correct projections along those Schwann cell columns connected with the corpuscles.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00688310

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11

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Intercellular deposits of basement membrane material in active human pituitary adenomas detected by immunostaining for laminin and electron microscopy (1986)

Holck, S. ; Wewer, U. M. ; Albrechtsen, R.

Springer

Acta neuropathologica 71 (1986), S. 326-331

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ISSN: 1432-0533

Keywords: Pituitary adenoma ; Basement membrane ; Laminin ; Immunohistochemistry ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Thirty-eight human pituitary adenomas (24 endocrine active and 14 endocrine inactive tumors) were studied immunohistochemically for the presence of the basement membrane component, laminin, and ultrastructurally for the presence of basement membrane. Immunoreactivity of laminin delineated staining of epithelial and endothelial basement membranes, the reaction product being confined mostly to the perivascular zones. Moreover, a hitherto undescribed presence of intercellular laminin-positive droplets was observed in ten of the active adenomas (nine patients with hyperprolactinemia and/or acromegalia and one patient with Cushing's syndrome). Concurrently, at the ultrastructural level, bunches of basement membrane-like material intermingled between the adenoma cells were demonstrated in seven of these ten active adenomas. Furthermore, secretory granules were entrapped occasionally in this intercellular matrix, indicating a mutual dependence between excessive hormone extrusion and an increase of “misplaced” deposits of basement membrane components, e.g., laminin.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00688057

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12

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Astroblastoma revisited: A report of three cases (1986)

Hoag, G. ; Sima, A. A. F. ; Rozdilsky, B.

Springer

Acta neuropathologica 70 (1986), S. 10-16

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ISSN: 1432-0533

Keywords: Astroblastoma ; Immunohistopathology ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The very existence of astroblastoma has been a question of considerable controversy, although there appears now to be sufficient documentation to establish it as a tenable entity. Due to the rarity of this tumor, little information exists in the literature as to its natural history, efficacy of therapy and its pathological and radiological appearance. We report three cases of astroblastoma, describing their natural history, the response to therapeutic interventions and their light microscopic, ultrastructural and immunohistochemical characteristics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00689508

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13

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Ultrastructural localization of S-100 protein in neurofibroma (1986)

Hirose, T. ; Sano, T. ; Hizawa, K.

Springer

Acta neuropathologica 69 (1986), S. 103-110

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ISSN: 1432-0533

Keywords: Neurofibroma ; von Recklinghausen's disease ; S-100 protein ; Electron microscopy ; Immunoelectron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The nature of the cells in neurofibromas was studied by electron microscopy and immunoelectron-microscopic examination of S-100 protein. Ultrastructurally, all five neurofibromas studied were found to be composed of Schwann cells, perineurial cells, and intermediate cells, which had features of both perineurial cells and fibroblasts. The Schwann cells had complex, branched cytoplasmic processes and a continuous basal lamina. The perineurial cells were distinguishable from Schwann cells by the presence of numerous pinocytotic vesicles, unbranched slender cytoplasmic processes and a discontinuous basal lamina. The intermediate cells had no basal lamina, but were topographically related to Schwann cells and had a similar fine structure to that of perineurial cells. Thus, they seemed to be modified neoplastic perineurial cells. Immunoelectron-microscopic studies showed the presence of cells with and without S-100 protein in the neurofibromas: cells with S-100 protein resembled Schwann cells ultrastructurally, and those without S-100 protein were perineurial and intermediate cells. Some Schwann cells with S-100 protein in one neurofibroma had numerous pinocytotic vesicles characteristic of perineurial cells, suggesting that Schwann cells and perineurial cells, are functional variants of the same cell type. Thus this study showed that neurofibromas were composed of Schwann cells with S-100 protein and perineurial and intermediate cells, including socalled endoneurial fibroblasts, without S-100 protein. Morphological and functional transition seems to occur between Schwann cells and perineurial cells, and between perineurial cells and intermediate cells.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00687045

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14

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Farber's disease in two siblings, sural nerve and subcutaneous biopsies by light and electron microscopy (1986)

Pellissier, J. F. ; Berard-Badier, M. ; Pinsard, N.

Springer

Acta neuropathologica 72 (1986), S. 178-188

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ISSN: 1432-0533

Keywords: Farber's disease ; Peripheral nerve ; Subcutaneous nodules ; Electron microscopy ; Ceramidase deficiency

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Two siblings born from consanguineous tunisian parents are reported. They showed a severe form of Farber's disease with prominent involvement of the central and peripheral nervous system: low conduction velocity was noticed in both children. Macular cherry red spots were observed in one of them. The diagnosis for the girl investigated was confirmed by evidence of ceramidase deficiency in cultured fibroblasts. Here we report the pathological findings in the subcutaneous nodules using light and electron microscopy (one case), and in sural nerves using morphometric studies (both cases). Varying morphological aspects of intracellular inclusions, depending on the tissues involved, are described and discussed. A review of all cases reported since Farber's first paper in 1952 is given.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00685981

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15

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Minisegments of newborn rat optic nerves in vitro: gliogenesis and myelination (1986)

Omlin, F. X. ; Waldmeyer, J.

Springer

Experimental brain research 65 (1986), S. 189-199

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ISSN: 1432-1106

Keywords: Rat optic nerve ; Gliogenesis ; Myelination ; In vitro ; In vivo ; Electron microscopy ; Immunocytochemistry

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The question of whether the development of CNS glial cells requires the presence of axons or not can be studied with in vitro systems. In order to compare the differentiation of glial cells during development in vitro with that in situ, we have selected the optic nerve, which is anatomically as well as histotypically a well defined structure. For the in vitro investigations, small explants, called minisegments, of newborn rat optic nerves were cultivated taking four major conditions into account: (1) the regular size of the minisegments should guarantee a permanent exchange of the culture medium in order to avoid cell death, (2) neither mechanical nor enzymatic dissociation of the tissue were applied, (3) the minisegments were explanted into flasks without substrate for cell adhesion and (4) the minisegments were under constant gyratory agitation. The following in situ results were obtained: optic nerves of newborn rats are morphologically characterized by the presence of naked axons, astrocytes, glial precursors, and the absence of both differentiated oligodendrocytes and myelin. At postnatal day 5 myelin sheaths are still absent. Two weeks after birth, differentiated oligodendrocytes and microglial cells are present and numerous axons are surrounded by compact myelin. The in vitro experiments show the following main results, which were obtained after 14 h, 2 d, 5 d and 14 d in culture: during time in culture, the shape of minisegment of newborn rat optic nerves undergoes drastic changes, which indicate high cellular dynamics. After 14 h in vitro, axonal profiles, cells with pyknotic nuclei as well as clusters of astrocytes and glial precursors are present. After 2 days in culture the axonal profiles disappeared and the number of degenerating cells decreased drastically. Many large cells, probably phagocytes containing inclusions and more cells are differentiated. At the stage of 5 d in vitro 4 major types of cells can be distinguished: differentiated oligodendrocytes, which form compact and loose myelin, astrocytes, large and small glioblasts and phagocytes. Immunoprecipitates for myelin basic protein and/or myelin associated glycoprotein were found in oligodendrocytes, in their processes and associated to the myelin. Processes of some astrocytes showed immunoreactive products of glial fibrillary acidic protein. After two weeks in culture, the minisegments were mostly composed of astrocytes, whereas oligodendrocytes became rare and phagocytes disappeared. It can be concluded that CNS glial cells can attain their structural and immunocytochemical characteristics in the total absence of neuronal cell bodies and axons. However, it can be speculated that neurons (or neuronal factors) could regulate the number of astrocytes and oligodendrocytes and keep these glial cells in a physiological equilibrium.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00243842

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16

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A paediatric case of sideroblastic anaemia (1986)

Claustres, M. ; Vannereau, H. ; Bellet, H. ; [et al.]

Springer

European journal of pediatrics 145 (1986), S. 422-427

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ISSN: 1432-1076

Keywords: CFU-E ; BFU-E ; Electron microscopy ; Sideroblastic anaemia ; Dyserythropoiesis

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract We examined the morphological and functional characteristics of erythroblasts derived from marrow erythroid progenitor cells grown in a methylcellulose microculture, which were taken from a female child with rate atypical sideroblastic anaemia (SA) partially responsive to pyridoxine. Colony formation was within the normal range in three successive cultures (median values: 82.25 CFU-E and 16.4 BFU-E derived colonies/6.6×104 cells) compared to growth by normal cells (65-315 CFU-E and 9-40 BFU-E). We evaluated in vitro differentiation by biochemical microassay of a cytosol enzyme involved in the haeme pathway: uroporphyrinogen I synthase (UROS). The UROS values in the erythroid colonies from SA marrow were at the lower end of the normal range (median values: 6.7±0.3 and 14.4±3.8 pmol uroporphyrinogen/h in CFU-E and BFU-E-derived colonies respectively versus 17.4±7.3 and 25±7.2 pmol/h in CFU-E and BFU-E colonies from normal subjects. Ultrastructural examination of the SA erythroblasts from non-cultured bone marrow or derived from cultured BFU-E revealed the characteristic deposition of iron in mitochondria around the nucleus of most cells (ringed sideroblasts). However, the majority of cultured cells had marked dyserythropoietic featuress, with a large number of bilobulated or trilobulated crythroblasts, multiple cytoplasmic vacuoles, numerous abnormalities of the nucleus, and excessive membrane material beneath the plasma membrane, all features difficult to observe in non-cultured marrows.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00439253

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17

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Cytomorphological changes in liver cells exposed to allyl and benzyl isothiocyanate and their cysteine and glutathione conjugates (1986)

Temmink, J. H. M. ; Bruggeman, I. M. ; Bladeren, P. J.

Springer

Archives of toxicology 59 (1986), S. 103-110

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ISSN: 1432-0738

Keywords: Cytotoxicity ; Cell morphology ; RL-4 hepatocyte ; Electron microscopy ; In vitro study ; Allyl isothiocyanate ; Benzyl isothiocyanate ; Tert-butylhydroperoxide

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Since allyl isothiocyanate has been reported to be a bladder carcinogen and benzyl isothiocyanate is a known anti-carcinogen, it is important to know the mode of their cytotoxic action. This was investigated in a RL-4 hepatocyte cell line by studying the morphological effects of increasing concentrations of the isothiocyanates and their glutathione and cysteine conjugates. These effects were compared with those induced by tert-butylhydroperoxide which supposedly has its primary effect upon the cytosolic glutathione status and thus upon the integrity of Ca2+-sequestrating mitochondria. The results agree with the previously postulated role of conjugation in the exposure of cells to isothiocyanates: Conjugates show effects similar to those produced by the free parent compounds because conjugates release free isothiocyanates in aqueous solution. The cytomorphological effects increase in a more or less dose-dependent manner with increasing concentrations of isothiocyanate or exposure time. Probably due to increased exposure, suspended RL-4 cells are more sensitive to the toxic action than cells growing on a substrate. No qualitative differences were found between the effects of allyl and benzyl isothiocyanate, indicating that their different effects in vivo are perhaps related to organ-specific differences in equilibrium between the conjugated and unconjugated forms of the test substances. The first cytomorphological effects of isothiocyanates consist of surface blebbing (zeiosis) and swelling of dictyosomal cisternae. At higher concentrations swelling extends to vesicles of endoplasmic reticulum. Mitochondria are not affected until the cells reach the necrotic phase of injury. In contrast, tert-butylhydroperoxide causes mitochondrial damage in an early pase of toxic injury. The cellular symptoms suggest that the primary target of isothiocyanates is in the plasma membrane and the cellular membrane system, affecting the monovalent cation and water balance of the cell organelles rather than the Ca2+ homeostasis as in cells exposed to tert-butylhydroperoxide. Differences in lipophilicity may be at the basis of this differenc in primary action.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00286732

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18

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An electron microscopic study of cerebral vasospasm with resultant myonecrosis in cases of subarachnoid haemorrhage, meningitis and trans-sylvian surgery (1986)

Yamashima, T. ; Kida, S. ; Yamamoto, S.

Springer

Journal of neurology 233 (1986), S. 348-357

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ISSN: 1432-1459

Keywords: Cerebral vasospasm ; Myonecrosis ; Myofilament ; Calcium ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Electron microscopic data on the development of myonecrosis following cerebral vasospasm associated with subarachnoid haemorrhage, meningitis and trans-sylvian surgery are presented. The basic feature of myonecrosis was dissolution of myofilaments with resultant fine granular or filamentous material. The disintegrating cytoplasm often contained numerous glycogen granules, dense bodies, autophagic vacuoles and myelin-like membranous bodies. A well-developed sarcoplasmic reticulum was preserved despite myofilament dissolution, while mitochondria showed marked sweling. The nuclei showed either dilution of chromatin or pyknotic change. The basal lamina was remarkably thickened and maintained an irregular outline of the necrotic smooth muscle cells. Enlarged intercellular space contained abundant cellular debris, vesicular structures and connective tissue fibres. The pathogenesis of these changes is discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00313921

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19

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A three dimensional model of the photosynthetic membranes of Ectothiorhodospira halochloris (1986)

Wanner, G. ; Steiner, R. ; Scheer, H.

Springer

Archives of microbiology 146 (1986), S. 267-274

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ISSN: 1432-072X

Keywords: Photosynthesis ; Membrane structure ; Electron microscopy ; Ectothiorhodospira ; Serial thin sectioning ; Three dimensional reconstruction

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The three dimensional organization of the complete photosynthetic apparatus of the extremely halophilic, bacteriochlorophyll b containing Ectothiorhodospira halochloris has been elaborated by several techniques of electron microscopy. Essentially all thylakoidal sacs are disc shaped and connected to the cytoplasmic membrane by small membraneous “bridges”. In sum, the lumina of all thylakoids (intrathylakoidal space) form one common periplasmic space. Thin sections confirm a paracrystalline arrangement of the photosynthetic complexes in situ. The ontogenic development of the photosynthetic apparatus is discussed based on a structural model derived from serial thin sections.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00403228

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Role of relA mutation in the survival of amino acid-starved Escherichia coli (1986)

Hecker, Michael ; Schroeter, Andreas ; Träder, Kersten ; [et al.]

Springer

Archives of microbiology 143 (1986), S. 400-402

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ISSN: 1432-072X

Keywords: E. coli relA +/relA ; Starvation survival ; Guanosine tetraphosphate ; Electron microscopy ; Glycogen

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Amino acid-starved cells of Escherichia coli relA +, which contain a large number of glycogen particles, are able to survive in phosphate buffer for a longer time period than their relaxed counterparts. With regard to NH 4 + starvation differences in the survival of both strains were not found. NH 4 + starved cells of E. coli relA are able to synthesize glycogen but amino acid-starved cells of the relA strain are not. We suggest that the synthesis of glycogen triggered by guanosine tetraphosphate during amino acid starvation is responsible for the prolonged viability of the E. coli relA + strain.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00412809

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Bradyrhizobium japonicum mutants defective in root-nodule bacteroid development and nitrogen fixation (1986)

Regensburger, B. ; Meyer, L. ; Filser, M. ; [et al.]

Springer

Archives of microbiology 144 (1986), S. 355-366

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ISSN: 1432-072X

Keywords: Bradyrhizobium ; Electron microscopy ; Mutants ; Nitrogen fixation ; Nodulation ; Soybean ; Symbiosis ; Transposon Tn5

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract The genome of the slow-growing Bradyrhizobium japonicum (strain 110) was mutagenized with transposon Tn5. A total of 1623 kanamycin/streptomycin resistant derivatives were screened in soybean infection tests for nodulation (Nod) and symbiotic nitrogen fixation (Fix). In this report we describe 14 strains possessing a stable, reproducible Nod+Fix- phenotype. These strains were also grown under microaerobic culture conditions to test them for free-living nitrogen fixation activity (Nif). In addition to strains having reduced Fix and Nif activities, there were also strains that had reduced symbiotic Fix activity but were Nif+ ex planta. Analysis of the genomic structure revealed that the majority of the strains had a single Tn5 insertion without any further apparent physical alteration. A few strains had additional insertions (by Tn5 or IS50), or a deletion, or had cointegrated part of the vector used for Tn5 mutagenesis. One of the insertions was found in a known nif gene (nifD) whereas all other mutations seem to affect different, hitherto unknown genes or operons. Several mutant strains had an altered nodulation phenotype, inducing numerous, small, widely distributed nodules. Light and electron microscopy revealed that most of these mutants were defective in different stages of bacteroid development and/or bacteroid persistence. The protein patterns of the mutants were inspected by two-dimensional gel electrophoresis after labelling microaerobic cultures with l-(35S)methionine. Of particular interest were mutants lacking a group of proteins the synthesis of which was known to be under oxygen control. Such strains can be regarded as potential regulatory mutants.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00409885

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Pathogenesis of pulmonary fibrosis induced by chrysotile asbestos (1986)

Fasske, E.

Springer

Virchows Archiv 408 (1986), S. 329-346

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ISSN: 1432-2307

Keywords: Pulmonary fibrosis ; Asbestosis ; Chrysotile ; Macrophages ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary A single instillation of 1 mg chrysotile B with a fiber length between 0.05 and 0.2 µm in 0.1 ml tricaprylin was made via a polyvinyl catheter into the lower lobe of the right lung of 120 six-week-old Wistar rats under anesthesia. The animals were killed at intervals between five minutes and two years. The lower lobes of the right lung were investigated by light and electron microscopy. The process of pulmonary fibrosis induced by asbestos can be subdivided into four phases: these are the phase of phagocytosis (five to 15 min), the phase of granuloma formation (between one and two weeks), the phase of septal fibrosis (between two and six months) and finally the scar stage (after one year). After instillation of small asbestos fibers into the alveoli, a major proportion of these fibers is phagocytosed by alveolar macrophages after five minutes and leaves the lungs via the airways. A proportion of the fibers penetrates through the alveolar wall (mostly conveyed by type I pneumocytes) and reaches the interstitium of the lungs. There, the fibers are taken up by pulmonary tissue macrophages and giant cells. Within the phagolysosomes, the fibers are broken down into fragments less than 0.01 µm in length. Type II pneumocytes produce surfactant in excess. These cells become necrotic, tubular myelin and lamellar bodies pass into the alveoli and into the interstitium. Surfactant is phagocytosed by resident macrophages. These macrophages phages can break down. Besides asbestos and surfactant, mediators of fibrillogenesis are released. Macrophages following up from blood monocytes ingest surfactant and asbestos. This process is perpetuated up to complete scarring. After two years, small asbestos fibers less than 0.01 µm long are present in fibroblasts and pleural mesothelia.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00707692

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Diversity of Vicia faba circular mtDNA in whole plants and suspension cultures (1986)

Negruk, V. I. ; Eisner, G. I. ; Redichkina, T. D. ; [et al.]

Springer

Theoretical and applied genetics 72 (1986), S. 541-547

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ISSN: 1432-2242

Keywords: Mitochondrial DNA of plants ; Electron microscopy ; Suspension culture ; Vicia faba

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary A comparative analysis of the Vicia faba mitochondrial genome in whole plants and in longterm suspension culture has been conducted. Restriction fragment patterns of the mtDNA isolated from these two sources were notably different. Electronmicroscopic analysis also revealed significant differences. Large circular mtDNA patterns shifted from a 37–80 kb subpopulation, which was predominant in whole plants, to 18–34 kb subpopulations although in both classes notable quantities of circular molecules of 80 to 120 kb and more were also found. Both in whole plant and suspension culture cells very large circular DNAs were observed. Some of them had lengths nearly 290 kb and could be considered as evidence of the existence of master chromosomes. The minicircular DNA population was also altered. In the suspension culture we observed a notable increase of percentage of minicircles with sizes near 1 kb. Simultaneously, the percentage of minicircles with sizes near 3.5–10 kb significantly increased in suspension culture cells. In addition, a new peak (10–12 kb) of minicircles appeared. Copy number alterations for some sequences homologous to CCC1A, CCC1B and CCC2 (Negruk et al. 1982, 1985) were shown. Southern hybridization revealed the existence of a family of minicircles having sizes 1.4–2 kb with predominance of CCC1A, CCC1B and CCC2. The copy numbers of CCC1B and some minor minicircles was changed in the suspension culture when compared with the whole plants.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00289538

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Lipokeratinocytes of the epidermis of a cetacean (Phocena phocena) (1986)

Menon, G. K. ; Grayson, S. ; Brown, B. E. ; [et al.]

Springer

Cell & tissue research 244 (1986), S. 385-394

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ISSN: 1432-0878

Keywords: Cetaceans ; Lamellar bodies ; Epidermal lipids ; Permeability barrier ; Electron microscopy ; Phocena phocena

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary Biochemical and ultrastructural analysis of epidermis from the porpoise, Phocena phocena, revealed certain similarities and differences between cetaceans and terrestrial mammals. The predominant cell of cetacean epidermis, not found in normal terrestrial mammals, is a lipoker-atinocyte, which elaborates not only keratin filaments, but also two types of lipid organelles: first, lamellar bodies, morphologically identical to those of terrestrial mammals, are elaborated in great abundance in all suprabasal epidermal layers, forming intercellular lipid bilayers in the stratum corneum interstices: and second, non-membrane-bounded droplets appear and persist in all epidermal layers. Although the porpoise lipokeratinocyte morpologically resembles the sebokeratocyte of avians in certain respects, nonmembrane-bounded lipid droplets are not released into the intercorneocyte space as they are in avian stratum corneum. Whereas phospholipid/neutral lipid gradients are similar in porpoise and terrestrial mammals, PAS-positive glycoconjugates, specifically glycosphingolipids, are retained in porpoise stratum corneum, but lost from these layers in terrestrials. The novel, non-polar acylglucosyl-ceramides, which also are lost during cornification in terrestrial mammals, are retained in porpoise stratum corneum. The lipid components of porpoise lipokeratinocytes appear to subserve not only barrier function in a hypertonic milieu, but also underlie the unique buoyancy, streamlining, insulatory, and caloric properties exhibited as adaptations to the cetacean habitat.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00219214

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Collagen remodeling during decidualization in the mouse (1986)

Zorn, Telma M. T. ; Bevilacqua, Estela M. A. F. ; Abrahamsohn, P. A.

Springer

Cell & tissue research 244 (1986), S. 443-448

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ISSN: 1432-0878

Keywords: Collagen ; Uterus ; Decidua ; Mouse ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary An ultrastructural study of the features and distribution of collagen fibrils was performed in the endometrium of virgin and pregnant (2nd to 11th day) mice. Collagen-containing structures were observed in the cytoplasm of fibroblasts on the 2nd day of pregnancy. Treatment of tissues with lanthanum nitrate established that these structures were intracytoplasmic. Their association with lysosome-like bodies suggested the occurrence of intracellular digestion of collagen, probably connected with remodeling of the endometrial stroma prior to decidualization. On the 4th day of pregnancy, very few collagen fibrils were present in the intercellular space. From the 6th day of pregnancy onwards, “thick” collagen fibrils were observed between decidual cells. The diameter of these fibrils measured up to 300 nm whereas the fibrils present in the endometrium of virgin mice measured 40–68 nm.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00219220

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Culture of intramural cardiac ganglia of the newborn guinea-pig (1986)

Kobayashi, Yasuko ; Hassall, Candace J. S. ; Burnstock, Geoffrey

Springer

Cell & tissue research 244 (1986), S. 605-612

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ISSN: 1432-0878

Keywords: Heart innervation ; Tissue culture ; Autonomic ganglia ; Non-neuronal cells ; Cell interrelationships ; Electron microscopy ; Guinea-pig

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The present study describes the ultrastructure of non-neuronal cells and their interrelationships with intracardiac neurones present in cultures dissociated atria and interatrial septum from newborn guinea-pig. When compared with the in situ preparation, most of these features in culture were similar to those observed in situ, but some differences were also apparent. Both mature and immature Schwann cells were observed in culture, and as in situ, the latter were closely associated with intracardiac neurones, whilst the former were more widely separated. The ultrastructure of satellite cells was more variable in culture than in situ: three general types were distinguished on the basis of their 10-nm filament content. This variation could be due to conditions of culture. Interstitial cells were present in culture and closely resembled those described in situ, although there was less space between cultured interstitial cells and their associated cells. Many fibroblasts, some myoblasts and a few mast cells were also found in the culture preparations.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00212540

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Culture of intramural cardiac ganglia of the newborn guinea-pig (1986)

Kobayashi, Yasuko ; Hassall, Candace J. S. ; Burnstock, Geoffrey

Springer

Cell & tissue research 244 (1986), S. 595-604

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ISSN: 1432-0878

Keywords: Heart innervation ; Tissue culture ; Autonomic ganglia ; Neurones ; Small granule-containing cells ; Electron microscopy ; Guinea-pig

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The ultrastructure of cultured intrinsic neurones and SIF (small intensely fluorescent) cells dissociated from the atria and interatrial septum of newborn guinea-pig heart has been studied for the first time and compared with these cells in situ. Mononucleate and binucleate neuronal somata and their processes were observed in the culture preparation; their ultrastructure was similar to that of neurones in intracardiac ganglia observed in situ. The number of neurites associated with neuronal cell bodies increased after the first week in culture. A subpopulation of intracardiac neurones showed abnormalities in culture, comparable to the changes previously described in neurones of the monkey heart after unilateral vagotomy in situ. Small granule-containing cells were observed in culture, corresponding to those described in the heart in situ. One type of large process in the culture preparation containing densely packed mitochondria has not been seen in situ, suggesting that changes in cell ultrastructure due to the conditions of culture cannot be discounted. However, the ultrastructure of the cultured cells was, for the most part, consistent with that of the same cell type in situ, indicating that the culture preparation may be a useful model for investigation of the roles and interactions of intramural neurones in the heart, which are inaccessible for such studies in situ.

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URL: http://dx.doi.org/10.1007/BF00212539

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Morphological evidence for the existence of a more complex cytoskeleton in Amoeba proteus (1986)

Christiani, Astrid ; Hügelmeyer, Peter ; Stockem, Wilhelm

Springer

Cell & tissue research 246 (1986), S. 163-168

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ISSN: 1432-0878

Keywords: Cytoskeletal organization ; Filaments ; Triton extraction ; Replica technique ; Electron microscopy ; Amoeba proteus

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary Various stabilization and extraction procedures were tested to demonstrate the ultrastructural organization of the cytoskeleton in normal, locomoting Amoeba proteus. Most reliable results were obtained after careful fixation in glutaraldehyde/lysine followed by prolonged extraction in a polyethylene glycol/Triton X-100 solution. Before dehydration in a graded series of ethanol and critical-point drying, the amoebae were split by the sandwich-technique, i.e., by mechanical cleavage of cells mounted between two poly-L-lysine-coated glass slides. Platinum-carbon replicas as well as thin sections prepared from such cell fragments revealed a cytoskeleton composed of at least four different types of filaments: (1) 5–7-nm filaments organized as a more or less ordered cortical network at the internal face of the plasma membrane and probably representing F-actin; (2) 10–12-nm filaments running separately or slightly aggregated through the cytoplasm and probably representing intermediate filaments; (3) 24–26-nm filaments forming a loose network and probably representing microtubules; and (4) 2–4-nm filaments as connecting elements between the other cytoskeleton constituents. Whereas microfilaments are responsible for protoplasmic streaming and other motile phenomena, the function of intermediate filaments and cytoplasmic microtubules in amoebae is still obscure.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00219013

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Structure and development of the surface coat of erythrocytic merozoites of Plasmodium knowlesi (1986)

Bannister, L. H. ; Mitchell, G. H. ; Butcher, G. A. ; [et al.]

Springer

Cell & tissue research 245 (1986), S. 281-290

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ISSN: 1432-0878

Keywords: Electron microscopy ; Malaria parasites ; Merozoites ; Surface coat ; Maturation ; Plasmodium knowlesi

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The surface of extracellular merozoites of P. knowlesi is covered with a coat 15–20 nm thick, made up of clusters of filaments standing erect on the plasma membrane. Filaments have stems 2 nm thick, the peripheral ends of which are complex, branching or ending in long trailing threads. Coat filaments occur on the surface of the parasite in regular rows at an early schizont stage, and persist until well after merozoite release. They are sensitive to trypsin and papain, and bind ethanolic phosphotungstate, indicating a proteinaceous nature. They are also removed by exposure to phosphate-buffered saline. Filaments bear negative charges, binding cationised ferritin throughout the depth of the coat and staining with ruthenium red. They cover the whole merozoite surface and mediate intercellular adhesion at distances of 15–150 nm, membrane to membrane. It is suggested that these filaments correspond to a major merozoite surface protein, and are important in the initial capture of red cells.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00213933

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Nephridial innervation in the leech Hirudo medicinalis L. (1986)

Wenning, Angela ; Cahill, Mary Anne

Springer

Cell & tissue research 245 (1986), S. 397-404

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ISSN: 1432-0878

Keywords: Leech ; Nephridium ; Innervation ; Electron microscopy ; Cobalt filling ; Hirudo medicinalis

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The main organs for salt and water homeostasis in the medicinal leech, the nephridia, were found to be densely innervated by a single branch of the corresponding median anterior segmental nerve. The projections of two different neurons into the nephridia are described: 1. Dendritic projections of the previously identified, afferent ‘nephridial nerve cell’, a possible salt receptor, lie between the urine forming cells and the blood vessels supplying the nephridium without making any contact. 2. Projections of an unidentified neuron which contains dense-core vesicles (85 nm) as well as smaller clear vesicles (45 nm) contact the primary urine forming canaliculus cells. The neurosecretory role of these neurons is considered.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00213947

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The coxo-trochanteral muscle receptor organ of locusts (1986)

Bräunig, Peter ; Cahill, Mary Anne ; Hustert, Reinhold

Springer

Cell & tissue research 243 (1986), S. 517-524

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ISSN: 1432-0878

Keywords: Muscle receptor organ ; Electron microscopy ; Tubular body ; Mechanosensory transduction ; Locust, Locusta migratoria migratorioides (R.&F.)

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The coxo-trochanteral muscle receptor organ of the hind leg of the locust Locusta migratoria migratorioides (R.&F.) has been investigated by use of scanning and transmission electron microscopy with special emphasis on its distal attachment site. The overall morphology of the receptor muscle, the sensory neuron and its dendrites was found to share many common features with other arthropod sense organs of that type with two important differences: (1) the connective tissue segment (= intercalated tendon) is extremely short compared to that of other muscle receptor organs; (2) the naked dendritic terminals of the non-ciliated, multipolar sensory neuron of the organ contain clusters of microtubules, interconnected by an amorphous matrix, that resemble the tubular bodies of ciliated, epithelial receptor cells.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00218058

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The hypothalamo-hypophysial system of the frog Rana temporaria (1986)

Chetverukhin, Vladimir K. ; Belenky, Michael A. ; Polenov, Audrey L.

Springer

Cell & tissue research 243 (1986), S. 649-654

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ISSN: 1432-0878

Keywords: Median eminence ; Peptidergic projections ; Aminergic projections ; Electron microscopy ; Autoradiography ; Frog (Rana temporaria)

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The median eminence (ME) of the adult frog, Rana temporaria, was studied by means of electron microscopy including quantitative electron-microscopic autoradiography. In frogs captured in May and June numerous peptidergic neurosecretory fibres extending via the internal zone to the pars nervosa display large swellings containing few granules, mitochondria, neurotubules and cisternae of the smooth endoplasmic reticulum. In addition, few secretory globules up to 1.5 μm in diameter occur in these varicosities. In animals collected during the autumn period many of these neurosecretory swellings filled with neurosecretory granules and polymorphic inclusions resemble Herring bodies. Three types of granule-containing neurosecretory fibres were observed in the external zone (EZ) of the ME of adult R. temporaria. Peptidergic A1- and A2-type fibres are characterized by granules 150–220 nm and 100–160 nm in diameter, respectively. Monoaminergic fibres of type B with granules approximately 100 nm in diameter represent ∼ 50% of all neurosecretory elements in the EZ of the frog ME; ∼12% of the total number of granule-bearing axons in the EZ actively taking up radiolabelled 5-hydroxytryptophan are thought to be serotoninergic terminals. Neurosecretory terminals of all types and glial vascular endfeet establish direct contacts with the perivascular space of the primary portal capillaries. Some neurosecretory terminals are separated from the lumen of the third ventricle by a thin cytoplasmic lamella of tanycytes. The possible physiological significance of this structural pattern is discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00218074

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An ultrastructural study of embryonic chick retinal neurons in culture (1986)

Bird, Margaret M.

Springer

Cell & tissue research 245 (1986), S. 563-577

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ISSN: 1432-0878

Keywords: Chick retina ; Tissue culture ; Electron microscopy ; Development, ontogenetic ; Differentiation

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary The differentiation of cells and synapses in explants of 9-day-old chick embryo retina has been studied by light and electron microscopy over a period of 35 days in vitro, and samples of retina from the 9-day chick foetus were directly fixed and prepared for study. At the time of explantation the retinae were poorly differentiated and no lamination was apparent. From day 14 onwards, (i) outer and inner nuclear layers (ONL, INL) separated by a layer of neuropil corresponding to the outer plexiform layer (OPL) and (ii) a layer of scattered large ganglion cells separated from the INL by a zone of neuropil resembling the inner plexiform layer (IPL) were apparent, and (iii) a well-differentiated outer limiting membrane was established close to the surface of the explants. In the oldest cultures some development of photoreceptor outer segments occurred but a distinct optic nerve fibre layer did not form. Although cell identification presented problems even in the oldest cultures, the major retinal cell types described in vivo could be identified. Photoreceptor cells developed pedicles in the OPL which became filled with synaptic vesicles and synaptic ribbons and established ribbon synapses (including triads) with and were commonly invaginated by processes from horizontal and bipolar cells. Processes of bipolar cells in the IPL formed simple and dyad synapses. At least two types of presynaptic amacrine cells were also identified in the INL, one of which contained large numbers of dense-core vesicles. The ganglion cells, though sparse, were large and well differentiated. These findings show that all the major neuronal types of the retina are capable of developing and differentiating in vitro, lagging behind the time-table of development and differentiation in vivo by approximately 7 days, but resulting in a histotypically organised retina with synaptic neuropil showing many similarities to the corresponding neuropil in vivo.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00218558

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Embryonic cholinesterase activity during morphogenesis of the mouse genital tract (1986)

Thiedemann, Klaus-Ulrich ; Vanittanakom, Pramote ; Schweers, Frank-Michael ; [et al.]

Springer

Cell & tissue research 244 (1986), S. 153-164

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ISSN: 1432-0878

Keywords: Cholinesterase ; Genital tract ; Mesenchyme ; Histochemistry ; Electron microscopy ; Mouse embryo

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary In the genital tract of male and female mouse embryos cholinesterase activity is described that is independent from innervation. The enzyme activity is localized in the mesenchyme at the junction of Wolffian and Müllerian ducts with the urogenital sinus. During male development prostate buds and vesicular glands grow out into the cholinesterase-active mesenchyme. During female development the active mesenchyme participates in the downgrowth of the vaginal anlage. Ultrastructurally the cholinesterase activity is localized in the perinuclear cisterna and in smooth endoplasmic reticulum of the mesenchymal cells. The enzyme activity disappears with definitive differentiation of the tissue. The embryonic cholinesterase is a component of a primitive muscarinic system. Its relation to the morphogenetic action of testosterone and its possible general functions are discussed.

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URL: http://dx.doi.org/10.1007/BF00218393

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Cytoplasmic virus-like particles associated with the nucleolus in wheat, similar to “S bodies” and retroposon particles (1986)

Jordan, E. G. ; Cooper, P. J.

Springer

Protoplasma 133 (1986), S. 160-164

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ISSN: 1615-6102

Keywords: Cytoplasm ; Electron microscopy ; Nucleolus ; Virus-like particles ; Wheat

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Wheat roots from germinating seedlings of Chinese spring wheatTriticum aestivum grown for 36 hours at 20°C were examined by conventional thin-section electron microscopy. Virus-like particles were seen inside a large cytoplasmic intrusion into the nucleus having the appearence of a nucleolar vacuole. The particles were isometric and about 50 nm in diameter with a membrane-like coat and a small core. The cytoplasmic intrusion was bounded by nuclear envelope with pores apparent where it abutted nucleoplasm. The particles are similar to previously reported solitary particles “S bodies” from a range of plants but are also similar in size and morphology to the retroposon particles associated with copia like elements in other organisms. The position of the virus-like particles in the young wheat roots is discussed in relation to interactions with components of the cell skeleton.

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URL: http://dx.doi.org/10.1007/BF01304631

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Influence of culture medium pH on charasome development and chloride transport inChara corallina (1986)

Lucas, W. J. ; Keifer, D. W. ; Pesacreta, T. C.

Springer

Protoplasma 130 (1986), S. 5-11

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ISSN: 1615-6102

Keywords: Chara corallina ; Charasome development ; Chloride transport ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Internodal cells ofChara, grown in culture either at pH 5.7, 6.5 or 7.5, were studied to determine their chloride influx capability, the quantitative aspects of charasome morphology and the degree to which these two parameters could be correlated. In cells grown at pH 5.7 the charasomes were relatively small, were widely spaced on the plasma membrane, and contributed only a 0.6% increase to the surface area of the plasma membrane in the acid region of the cell. In contrast, the charasome membrane surface area of cells grown at pH 7.5 had increased × 19, the density of charasomes on the cell surface increased × 42, thus producing a × 3.57 increase in the acid region plasma membrane surface area. Chloride influx in cells grown at pH 7.5 was × 8.7–12.7 greater than in cells grown at pH 5.7. Cells that had been starved of chloride exhibited a × 2.4 average increase in the rate of chloride influx. Our observations establish the existence of a positive correlation between the rate of chloride influx and the increase in membrane surface area due to charasomes, although other factors, such as the effect of pH on transport-related enzymes, and the effect of charasome structure on chemical equilibria, may also be of importance.

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URL: http://dx.doi.org/10.1007/BF01283326

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The effects of raised phosphate level on the energy metabolism, contractile function, and fine structure of oxygenated and oxygen-deficient myocardium (1986)

Armiger, Lois C. ; Humphrey, Stuart M. ; West, Elizabeth J. N. ; [et al.]

Springer

Heart and vessels 2 (1986), S. 6-14

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ISSN: 1615-2573

Keywords: Inorganic phosphate ; Normoxia/anoxia ; ATP ; Glycogen ; Cardiac function ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The possible role of inorganic phosphate (Pi) in depressing the contractility of oxygen-deficient myocardium was investigated by examining the effects of 30 mM Pi on the cardiac function and myocardial biochemistry and fine structure in normoxic and anoxic Langendorff-perfused isolated rat hearts. In normoxia, the intracellular Pi level increased three-fold, the ATP content remained normal, and there was moderate loss of glycogen only. Contractile performance (as assessed from systolic pressure recordings) was significantly depressed, as was the heart rate for the first 10 min. The myocardial fine structure showed persistent glycogen, marked relaxation of myofibrils, and a higher incidence of vacuolation than in hearts with normal Pi. In anoxia, the intracellular Pi level was comparable with that of the perfusate and both ATP and glycogen were severely depleted. Contractile performance and heart beat ceased completely at 15 min, although in anoxic controls both persisted at low levels for at least 25 min. In anoxia, Pi also depressed coronary flow rate. In the inner half of the ventricular wall of oxygen-depleted hearts, where flow became reduced after 15 or more min, Pi markedly reduced the formation of intramitochondrial densities and augmented mitochondrial swelling and ischaemic contracture, which extended out through the mid-myocardium. In the outer half of the wall, where flow remained high, it promoted severe dilatation of the sarcoplasmic reticulum vesicles and undifferentiated regions of the intercalated discs. The observed effects in normoxia are probably attributable at least in part to the lowering of the free Ca2+ concentration of the perfusate by the increased Pi level. The effects in anoxia may be related chiefly to the critical reduction of available intracellular Ca2+ and the more rapid and extensive development of ischaemic contracture.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02060238

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In vivo homologous recombination intermediates of yeast mitochondrial DNA analyzed by electron microscopy (1986)

Sena, Elissa P. ; Revet, Bernard ; Moustacchi, Ethel

Springer

Molecular genetics and genomics 202 (1986), S. 421-428

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ISSN: 1617-4623

Keywords: Recombination intermediates ; Mitochondrial DNA ; Electron microscopy ; Saccharomyces cerevisiae

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary To study the structure of in vivo mitochondrial DNA recombination intermediates in Saccharomyces cerevisiae, we used a deletion mutant of the wild type mitochondrial genome. The mtDNA of this petite is composed of a direct tandem repetition of an ∼4,600 pb monomer repeat unit with a unique HhaI restriction enzyme site per repeat. The structure of native mtDNA isolated from log phase cells, and mtDNA crosslinked in vivo with trioxsalen plus UVA irradiation, was studied by electron microscopy. Both populations contained crossed strand “Holliday” type recombination intermediates. Digestion of both non-crosslinked and crosslinked and mtDNA with the enzyme HhaI released X and H shaped structures composed of two monomers. Electron microscopic analysis revealed that these structures had pairs of equal length arms as required for homologous recombination intermediates and that junctions could occur at points along the entire monomer length. The percentage of recombining monomers in both non-crosslinked and trioxsalen crosslinked mtDNA was calculated by quantitative analysis of all the structures present in an HhaI digest. The relationship between these values and the apparent dispersive replication of mtDNA in density-shift experiments and mtDNA fragility during isolation is discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00333272

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Electron microscopic localization of hydrogenase genes on the megaplasmid pHG 1 in Alcaligenes eutrophus (1986)

Rohde, Christine ; Johannssen, Walther ; Mayer, Frank

Springer

Molecular genetics and genomics 202 (1986), S. 476-480

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ISSN: 1617-4623

Keywords: Hydrogen bacterium ; Hydrogenase genes ; Megaplasmid pHG1 ; Localization ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Plasmids carrying hydrogenase genes in Alcaligenes eutrophus wild type H 16 and in two transposon Tn5 —induced mutants have been investigated by electron microscopy. Besides the pHG1 megaplasmid (458±27 kb) carrying genes coding for structural and regulatory properties of hydrogenases, small plasmids of unknown significance have been detected. The sizes of EcoRI fragments obtained from pHG1 were measured from electron micrographs. They were significantly different from sizes determined previously by agarose gel electrophoresis. Plasmid pHG1 isolated from the wild type H 16 was shown to contain two inverted repeats (IR 16-1 and IR 16-2) with sizes similar to known transposons. From electron microscopic hybridization studies, it was deduced that the sites of insertion of Tn5 into a regulation gene on pHG1 for both soluble and membrane-bound hydrogenase, and of Tn5-Mob into the gene coding for structural properties of the soluble hydrogenase, are about 67.2 kb apart. One of the inverted repeats (IR 16-1) was localized in between these sites.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00333280

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Abnormal mucociliary function in a mucocoele of the maxillary antrum (1986)

Ohashi, Y. ; Nakai, Y. ; Muraoka, M.

Springer

European archives of oto-rhino-laryngology and head & neck 243 (1986), S. 207-210

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ISSN: 1434-4726

Keywords: Maxillary sinus mucocoele ; Mucociliary system ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary We have examined the mucociliary function present in a mucocoele of the maxillary antrum and have found certain abnormalities in the tissues studied. Our findings also indicate that the mucocoele's intrinsic pathology is too complex to be improved by any conservative treatment and justifies its surgical removal.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00470623

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An experimental study of auditory dysfunction associated with hyperlipoproteinemia (1986)

Saito, T. ; Sato, K. ; Saito, H.

Springer

European archives of oto-rhino-laryngology and head & neck 243 (1986), S. 242-245

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ISSN: 1434-4726

Keywords: Hyperlipoproteinemia ; Auditory dysfunction ; Cochlea ; Histochemistry ; Electron microscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary We sought to clarify whether or not hyperlipoproteinemia induces auditory dysfunction. In so doing, we studied the general states and cochlear pathologies of guinea pigs after the administration of a hyperlipid diet for 3 months. Serum biochemistries indicated marked elevations of cholesterol, high density lipoprotein (HDL)-cholesterol and low density lipoprotein (LDL) levels. An increased auditory threshold varying from 10 to 20 dB was observed in 40% of the guinea pigs using auditory brainstem responses. Histochemical study of the inner ear revealed variations in lipid metabolism and partial disorders of the outer hair cells. Electron microscopic observations showed vacuolar and parenchymal protrusions on the surfaces of the stria vascularis and Corti's organ, and vacuolar degeneration was seen around the capillary vessels of the vascular stria. Our data has shown that the auditory dysfunction present in the inner ear was less marked than were the morphological changes seen. Our findings suggest that other factors besides hyperlipoproteinemia are involved in the development of severe auditory damage.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00464438

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Italian multicenter study of dementia: a pathologically verified case of Alzheimer disease (1986)

Tabaton, M ; Schenone, A ; Mancardi, G. L.

Springer

Neurological sciences 7 (1986), S. 161-163

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ISSN: 1590-3478

Keywords: Alzheimer disease ; Electron microscopy ; Epidemiological study

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Description / Table of Contents: Sommario Viene descritto lo studio neuropatologico di un caso incluso nello Studio Multicentrico Italiano sulla Demenza sulla base di dati clinici. L'esame istologico ed ultrastrutturale conferma la diagnosi di malattia di Alzheimer avvalorando quindi il protocollo clinico.

Notes: Abstract The pathological findings in a case included in the Italian multicenter study of dementia on clinical grounds are reported. The histological and ultrastructural examination confirms the diagnosis of Alzheimer disease, evidence for the validity of the clinical protocol.

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URL: http://dx.doi.org/10.1007/BF02230435

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Impressum (1986)

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986)

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19860980101

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Fünfgliedrige Ringe durch [3+2]-Cycloaddition mit Trimethylenmethan und Syntheseäquivalenten (1986)

Trost, Barry M.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 1-20

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Die Bildung von Ringen durch Cycloaddition ist aufgrund ihres Potentials für Chemo-, Regio-, Diastereo- und Enantioselektivität von besonderem Wert. Trimethylenmethan (TMM) und seine Syntheseäquivalente ermöglichen es, diese Vorteile bei der Synthese fünfgliedriger Ringe zu nutzen. Drei Typen von Reagentien sind aussichtsreiche Kandidaten: 1. Ausgewählte 4-Alkyliden-4,5-dihydro-3H-pyrazole, 2. 2-[(Trimethylsilyl)methyl]allyl-ester und -halogenide sowie 3. Alkylidencyclopropane. Die Cycloaddition der Pyrazole an (elektronenarme) Olefine gelingt durch thermische, speziell intramolekulare Reaktionen. Für die beiden anderen Vorstufen benötigt man Katalysatoren, vorzugsweise Palladium-Komplexe. Bei den 2-(Silylmethyl)allylestern führt eine allgemeine chemo-, regio- und diastereoselektive Cycloaddition an typische Diels-Alder-Dienophile zu Methylencyclopentanen. Mit einem Zinn-Analogon lassen sich aus Carbonylverbindungen und Iminen mit hervorragender Diastereoselektivität 3-Methylen-tetrahydrofurane bzw. -pyrrolidine herstellen. Die 2-(Silylmethyl)allylester ermöglichen auch die Anellierung einer Methylencyclopentan-Einheit an cyclische Enole. Solche Addukte kann man unter C3-Einschiebung oder unter kombinierter Ringverengung und Spiroanellierung umsetzen, indem man ein nucleophiles bzw. ein elektrophiles Steuerreagens anwendet. Bei Alkylidencyclopropanen, die mit elektronenreichen wie mit elektronenarmen Olefinen reagieren, ist die Regioselektivität komplementär zu derjenigen der Silylreagentien. - Alle diese Cycloadditionen haben es ermöglicht, neue Strategien für Naturstoffsynthesen zu entwickeln.

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980102

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Ag3O4, das erste Silber(II,III)-oxidIn memoriam Wilhelm KlemmDiese Arbeit wurde vom Fonds der Chemischen Industrie gefördert. (1986)

Standke, Burkhard ; Jansen, Martin

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 78-79

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Autoren, die eine “Zuschrift” veröffentlichen wollen, sollten vor der Abfassung ihres Manuskripts unbedingt die “Hinweise für Autoren” lesen, die jeweils im Januarheft eines Jahrgangs nach dem Inhaltsverzeichnis gedruckt sind; auf Anforderung können sie auch von der Redaktion erhalten werden.

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URL: http://dx.doi.org/10.1002/ange.19860980107

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Me3SiNPNSiMe⊖3, das Monophosphor-Analogon eines Triazenido-LigandenDiese Arbeit wurde vom Fonds der Chemischen Industrie gefördert. (1986)

Scherer, Otto J. ; Franke, Ekkehard ; Kaub, Jürgen

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 83-84

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19860980111

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Divinylglykole zur Synthese von Desoxyhexosen - Synthese von D- und L-ChalcoseDe-novo-Synthesen von Kohlenhydraten und verwandten Naturstoffen, 20. Mitteilung. Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft und vom Fonds der Chemischen Industrie gefördert. - 19. Mitteilung: [3]. (1986)

Küfner, Ulrike ; Schmidt, Richard R.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 90-91

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19860980116

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Direkte Bestimmung der Additionsgeschwindigkeiten von Carbenium-Ionen an AlkeneDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert. Wir danken Prof. Dr. O. Nuyken, Mainz, und Herrn R. Bederke, Lübeck, für ihre Hilfe beim Aufbau des Meßplatzes. (1986)

Schneider, Reinhard ; Grabis, Ute ; Mayr, Herbert

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 94-95

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Tab.

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URL: http://dx.doi.org/10.1002/ange.19860980119

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Nitrilylide und Azirine: Erzeugung in der Gasphase aus 2,3-Dihydro-1,4,2λ5-oxazaphospholen und Matrix-IsolierungDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft, dem Fonds der Chemischen Industrie und der University of Queensland gefördert. (1986)

Wentrup, Curt ; Fischer, Stephan ; Berstermann, Hans-Michael ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 99-100

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19860980123

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Hexa-tert-butyldisilan - das Molekül mit der bisher längsten Si - Si-BindungVerbindungen des Siliciums, 62. Mitteilung. - 61. Mitteilung: N. Wiberg, K. Schurz, G. Fisher, Angew. Chem. 97 (1985) 1058; Angew. Chem. Int. Ed. Engl. 24 (1985) 1053. (1986)

Wiberg, Nils ; Schuster, Harald ; Simon, Arndt ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 100-101

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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Einfache Synthese von Pentaphenylnickelocen und anderen Pentaphenylcyclopentadienylnickel- sowie -cobalt-KomplexenDiese Arbeit wurde vom Fonds der Chemischen Industrie gefördert. Wir danken Prof. Dr. H. Lueken für die Suszeptibilitätsmessungen sowie Frau S. Paul und Priv.-Doz. Dr. U. Kölle für die Cyclovoltammogramme. (1986)

Kläui, Wolfgang ; Ramacher, Ludwig

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 107-108

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980130

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Optisch aktive Alkohole aus 1,3-Dioxan-4-onen; eine praktikable Variante der asymmetrischen Synthese unter nucleophiler Substitution an AcetalzentrenTeil der geplanten Dissertation von R. I. und der Diplomarbeit (1985) von G. St., ETH Zürich. (1986)

Seebach, Dieter ; Imwinkelried, René ; Stucky, Gerhard

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 182-183

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 3 Tab.

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Synthese-Äquivalent für Amino-carboxy-carben; Synthese von 1-Amino-1-cyclopropancarbonsäure-methylesternProfessor Heinz A. Staab zum 60. Geburtstag gewidmet (1986)

Hauptreif, Manfred ; Egert, Ernst ; Schöllkopf, Ulrich ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 187-189

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980224

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Laticyclische 1,5-Konjugation zwischen parallel angeordneten, benachbarten Azo- und PhenylengruppenDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft, dem Fonds der Chemischen Industrie und der BASF AG, Ludwigshafen, gefördert. (1986)

Beck, Karin ; Hünig, Siegfried

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 193-194

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19860980228

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Ethylenoxid - Röntgen-Strukturanalyse (bei 150 K) und ab-initio-RechnungenDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert.Professor George A. Jeffrey zum 70. Geburtstag gewidmet (1986)

Luger, Peter ; Zaki, Chakib ; Buschmann, Jürgen ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 254-255

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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[Bi2IIIS34]4-, der bisher schwefelreichste Komplex (1986)

Müller, Achim ; Zimmermann, Marion ; Bögge, Hartmut

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 259-259

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980311

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[Re4IVS22]4-, ein hochsymmetrischer Metall-Schwefel-Cluster mit sechs S32--LigandenProfessor Rolf Appel zum 65. Geburtstag gewidmet (1986)

Müller, Achim ; Krickemeyer, Erich ; Bögge, Hartmut

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 258-259

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980310

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Porphycen - ein neuartiges Porphin-IsomerDiese Arbeit wurde von der Stiftung Volkswagenwerk und dem Fonds der Chemischen Industrie gefördert. (1986)

Vogel, Emanuel ; Köcher, Matthias ; Schmickler, Hans ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 262-264

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980314

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Neue Produkte aus PCl3, P(NMe2)3 und AlCl3Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert.Professor Rolf Appel zum 65. Geburtstag gewidmet (1986)

Schmidpeter, Alfred ; Lochschmidt, Siegfried

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 271-273

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Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19860980320

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Neuartige Fulvalen-Komplexe des Zirconiums - ein einfacher Zugang zur Organozirconium(III)-ChemieDiese Arbeit wurde durch die Deutsche Forschungsgemeinschaft, das Bundesministerium für Forschung und Technologie, die Alexander-von-Humboldt-Stiftung (Stipendien an T. V. A. und T. C. A.) sowie die Hoechst Aktiengesellschaft gefördert. (1986)

Ashworth, Terence V. ; Agreda, Tomas Cuenca ; Herdtweck, Eberhardt ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 278-279

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Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980325

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Palladium(II)- und Platin(II)-Komplexe mit 1,4,7,10,13,16-HexathiacyclooctadecanDiese Arbeit wurde vom Science and Engineering Research Council in the United Kingdom gefördert (A. J. L.). Der Firma Johnson-Matthey PLC danken wir für eine Platin-Leihgabe. (1986)

Blake, Alexander J. ; Gould, Robert O. ; Lavery, Aidan J. ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 282-283

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980328

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Lösungsmittelpolarität und anomerer EffektStructure and Conformation of Heterocycles, 15. Mitteilung. - 14. Mitteilung: [1]. (1986)

Fuchs, Benzion ; Ellencweig, Aviyakar ; Tartakovsky, Evgeny ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 289-290

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Reductions in Organic Chemistry. Von M. Hudlicky. Ellis Horwood Ltd., Chichester 1984. XVI, 309 S., geb £ 35.00. - ISBN 0-85312-345-4 (1986)

Montforts, Franz-Peter

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 291-291

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Impressum (1986)

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986)

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Erheblich erleichterte Ring-Oxidation an Cer(IV)-bisporphyrinaten mit DoppeldeckerstrukturMetallkomplexe mit Tetrapyrrol-Liganden, 41. Mitteilung. Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft, dem Fonds der Chemischen Industrie und der Vereinigung von Freunden der Technischen Hochschule Darmstadt gefördert. - 40. Mitteilung: [5].Professor Hans Herloff Inhoffen zum 80. Geburtstag gewidmet (1986)

Buchler, Johann W. ; Elsässer, Kyra ; Kihn-Botulinski, Martina ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 257-258

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Synthese von N-(1-Carboxy-5-aminopentyl)dipeptiden als Inhibitoren des Angiotensin Converting EnzymeDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert. Für ihre Unterstützung sei Herren Dr. H. Urbach und Dr. R. Henning sowie Herrn Prof. Dr.F. Effenberger und Frau U. Burkard gedankt. (1986)

Escher, Rüdiger ; Bünning, Peter

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 264-265

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HexaethinylbenzolDiese Arbeit wurde vom Department of Energy (Materials Science Division, Office of Basic Energy Sciences, Office of Energy Research, Contract Nr. DE-AC03-67SF00098) gefördert. J. C. A. war ein IBM Polymer Fellow (1984-1985). R. D. erhielt ein NATO Science Fellowship (1984-1985). K. P. C. V. ist Miller Professor in Residence (1985-1986). (1986)

Diercks, Rainer ; Armstrong, James C. ; Boese, Roland ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 270-271

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Hydroxyacetylen: Erzeugung und Charakterisierung des Neutralmoleküls, Radikalkations und Dikations in der GasphaseDiese Arbeit wurde durch den Fonds der Chemischen Industrie und die Deutsche Forschungsgemeinschaft gefördert. J. K. T. dankt dem Deutschen Akademischen Austauschdienst (DAAD) für ein Stipendium.Professor David Ginsburg zum 65. Geburtstag gewidmet (1986)

van Baar, Ben ; Weiske, Thomas ; Terlouw, Johan K. ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 275-276

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Techniques in Organic Reaction Kinetics. Von P. Zuman und R. C. Patel. John Wiley, Chichester 1984. 340 S., geb. £ 57.25. - ISBN 0-471-103556-4 (1986)

Limbach, Hans-Heinrich

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 291-291

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Boussingault. Chemist and Agriculturist. Von F. W. J. McCosh. D. Reidel Publishing Co., Dordrecht 1984. XV, 280 S., geb Hfl. 140.00 - ISBN 90-277-1682-X (1986)

Böhm, Wolfgang

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 292-292

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Das Konzept der Spannung in der Organischen Chemie (1986)

Wiberg, Kenneth B.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 312-322

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Notes: „Die Ringschließung ist offenbar diejenige Erscheinung, welche am meisten übe dir räumliche Anordnung der Atome Auskunft geben Kann. Wenn eine Kette von 5 und 6 Gliedern sich leicht, eine von weniger oder mehr Gliedern sich schwierig oder auch gar nicht schließen läßt, so müssen dafür offenbar räumliche Gründe vorhanden sein. … Die vier Valenzen des Kohlenstoffatoms wirken in den Richtungen, welche den Mittelpunkt der Kugel mit den Tetraederecken verbinden, und welche miteinander einen Winkel von 109°28′ machen. Die Richtung der Anziehung kann eine Ablenkung erfahren, die jedoch eine mit der Größe der Letzteren wachsende Spannung zur Folge hat.“ Das ist die Quintessenz der vor einem Jahrhundert von Adolf von Baeyer formulierten „Ringspannungstheorie“. Zwar ist sie heute nur noch eine Facette unter den vielen Aspekten der Spannungstheorie, doch hat sie präparative und theoretisch arbeitende Chemiker immer wieder stimuliert. Zu den spektakulärsten neueren Erfolgen der Synthetiker gehören zweifellos die Darstellung von Tetra-tert-butyl-tetrahedran und [1.1.1]Propellan. Die Gründe für die große Stabilität dieser hochgespannten Verbindungen sind völlig verschieden. Die auf dem Weg dorthin und bei der theoretischen Durchdringung der Probleme mit Molekül-Mechanik- und ab-initio-Rechnungen gewonnenen Erkenntnisse haben entscheidend zu unserem heutigen Verständnis von Struktur, Energie und Reaktivität organischer Verbindungen beigetragen.

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Einfache Anthracyclinon-Synthese durch Cyclisierung eines intermediären HydroxynitronatsSynthetische Anthracyclinone, 30. Mitteilung. - 29. Mitteilung: [1]. (1986)

Krohn, Karsten ; Priyono, Wahyudi

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 338-339

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10,10′-Bi(trispiro[2.0.2.0.2.1]decyliden): Ein hochnucleophiler olefinischer KohlenwasserstoffDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft (Projekt Me 405/15-1) und von Fonds der Chemischen Industrie gefördert. H. W. dankt dem Fonds der Chemischen Industrie für ein Doktorandenstipendium und F. G dem Schweizerischen Nationalfonds zur Förderung der wissenschaftlichen Forschung für Unterstützung.Professor Hans Musso zum 60. Geburtstag gewidmet (1986)

Wenck, Horst ; de Meijere, Armin ; Gerson, Fabian ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 343-344

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Organische Reaktionen unter hohem Druck: Cycloadditionen von 11-Methylen-1,6-methano[10]annulenDiese Arbeit wurde vom Minister für Wissenschaft und Forschung des Landes Nordrhein-Westfalen und vom Fonds der Chemischen Industrie gefördert. Prof. Dr. H. Duddeck und Dr. M. Kaiser, Universität Bochum, danken wir für Aufnahme und Interpretationshilfe der hochaufgelösten NMR-Spektren. (1986)

Klärner, Frank-Gerrit ; Dogan, Barbara M. J. ; Weider, Richard ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 344-345

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[(η5-C5H5)2Mo2(CO)4(PPh)2], ein Diphosphenkomplex mit SchmetterlingsstrukturDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert. Dem Institut für Kristallographie der Universität Karlsruhe danken wir für die Messung der Kristalldaten. (1986)

Fenske, Dieter ; Merzweiler, Kurt

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 357-358

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Enantiomerentrennung von (R,S)-2-(tert-Butyl)-3-methyl-4-imidazolidinon, einem chiralen Baustein für die AminosäuresyntheseTeil der geplanten Dissertation von R. F., ETH Zürich. (1986)

Fitzi, Robert ; Seebach, Dieter

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 363-364

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Ge4.06I, ein unerwartetes Germaniumsubiodid - ein Tetragermanioiodonium(III)-iodid mit Clathratstruktur [Ge46—xIx]I8, X=8/3 (1986)

Nesper, Reinhard ; Curda, Jan ; von Schnering, Hans-Georg

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 369-370

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[(a-Cyanbenzyllithium·Tetramethylethylendiamin)2·Benzol]: Röntgen-Strukturanalyse eines α-Nitril-„Carbanions“Diese Arbeit wurde vom Fonds der Chemischen Industrie, von der Deutschen Forschungsgemeinschaft und der NATO (Reisestipendium) gefördert. Prof. Dr. K. Dehnicke, Universität Marburg, danken wir für das IR-Spektrum von 1·C6H6. (1986)

Boche, Gernot ; Marsch, Michael ; Harms, Klaus

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 373-374

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Electroorganic Chemistry as a New Tool in Organic Synthesis. Von T. Shono. Springer-Verlag, Heidelberg 1984. XI, 171 S., geb. DM 128.00 - ISBN 3-540-13070-5 (1986)

Steckhan, Enerhard

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 378-378

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Organische Synthese bei hohen Temperaturen: Gasphasen-StrömungsthermolyseAus der Habilitationsschrift von M. Karpf, Universität Zürich 1984. (1986)

Karpf, Martin

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 413-429

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Notes: Die bevorzugte Durchführung organischer Synthesen bei möglichst tiefen Temperaturen beruht auf der an vielen Beispielen bestätigten und auch theoretisch begründeten Annahme, daß die Selektivität häufig mit sinkender Temperatur zunimmt. Mangelnde Selektivität ist nicht das einzige Problem von Hochtemperaturreaktionen, hinzu kommt unter anderem die oft begrenzte thermische Stabilität der an der Umwandlung nicht direkt beteiligten funktionellen Gruppen und Strukturelemente. Trotz dieser Einschränkungen lassen sich die Vorteile hoher Temperaturen, vor allem dank der in den letzten Jahren stark erweiterten Kenntnisse der Mechanismen dynamischer Gasphasenprozesse, für die gezielte organische Synthese nützen. In diesem Fortschrittsbericht wird das Synthesepotential der „Gasphasen-Strömungsthermolyse“ aus der Sicht des präparativ arbeitenden Chemikers anhand typischer Anwendungsbeispiele beschrieben.

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[Cu36I56]20⊖ - ein neuartiges Polyanion in der Verbindung (pyH)2[Cu3I5]Professor Georg Manecke zum 70. Geburtstag gewidmetSynthese und Strukturuntersuchung von Iodocupraten(I), 7. Mitteilung. Diese Arbeit wurde vom Fonds der Chemischen Industrie gefördert. - 6. Mitteilung: [2]. (1986)

Hartl, Hans ; Fuchs, Joachim

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 550-551

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Reduzierte Cobalt-meso-tetraphenylporphyrin-Komplexe: Synthese und Struktur von [Na(thf)3]2[Co(TPP)] (1986)

Ciurli, Stefano ; Gambarotta, Sandro ; Floriani, Carlo ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 553-555

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Bicyclo[3.2.1]octa-2,6-dienyllithiumDiese Arbeit wurde vom Fonds der Chemischen Industrie und der BASF gefördert. (1986)

Hertkorn, Norbert ; Köhler, Frank H. ; Müller, Gerhard ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 462-463

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P6tBu4O und P7tBu5O - die ersten PolycyclophosphanoxideProfessor Rolf Appel zum 65. Geburtstag gewidmetBeiträge zur Chemie des Phosphors, 165. Mitteilung. Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert. - 164. Mitteilung: M. Baudler, L. de Riese-Meyer, Z. Naturforsch. B, im Druck. (1986)

Baudler, Marianne ; Michels, Michael ; Pieroth, Manfred ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 465-467

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ESR-spektroskopischer Nachweis thermisch erzeugter Triplett-Nitrene und photochemisch erzeugter Triplett-CycloheptatrienylideneDiese Arbeit wurde an der Universität Marburg begonnen und durch die Deutsche Forschungsgemeinschaft, den Fonds der Chemischen Industrie und die University of Queensland, Australien, gefördert. (1986)

Kuzaj, Martin ; Lüerssen, Holger ; Wentrup, Curt

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 476-477

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Analytical Solution Calorimetry. Herausgegeben von J. K. Grime. Wiley, Chichester 1985. XVI, 401 S., geb. £ 69.40. - ISBN 0-471-86942-2 (1986)

Ackermann, Theodor

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 482-482

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Die Chemie des nicht-kristallinen Zustands (1986)

Elliott, Stephen R. ; Thomas, John M.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 31-46

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Notes: Feststoffe, die weitgehend fehlgeordnet sind - nicht-kristalline oder amorphe Stoffe - haben besondere chemische und physikalische Eigenschaften. Ein Schlüssel zum Verständnis des Verhaltens solcher Materialien ist die Kenntnis ihrer Nahordnung. Unser heutiges Wissen über nicht-kristalline Systeme stammt aus vielen Quellen, z. B. Rötgenbeugungsexperimenten, EXAFS-Spektren, MAS-NMR-Untersuchungen und Modellstudien. So läßt sich der Übergang zwischen flüssigem und glasartigem Zustand, der bei Unterkühlung einer Flüssigkeit auftritt, z. B. anhand von thermodynamischen Modellen oder Clustermodellen diskutieren. Die Fehlordnung wirkt sich auch auf die elektronischen Eigenschaften aus; neue Entwicklungen tragen zum Verständnis der Elektronen-Lokalisierung an topologischen Fehlstellen und von Transportprozessen bei. Als Anwendungsbeispiel seien Lichtleitfasern für Kommunikationsnetze genannt; superionenleitende Gläser dürften sich für Festkörperbatterien eignen.

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[4+2]-Cycloadditionen mit übergangsmetallkoordinierten Selenoaldehyden und Selenoketonen als HeterodienophileDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert. (1986)

Fischer, Helmut ; Gerbing, Ulrike ; Riede, Jürgen ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 80-81

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980109

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Ein Rezeptor-vermittelter Stoffwechselweg für die Cholesterin-Homöostase (Nobel-Vortrag)Copyright © The Nobel Foundation 1986. - Wir danken der Nobel-Stiftung, Stockholm, für die Genehmigung zum Druck dieser Übersetzung. (1986)

Brown, Michael S. ; Goldstein, Joseph L.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 579-599

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Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 16 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980702

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Die Gewinnung von Phaseninformation aus Intensitätsdaten (Nobel-Vortrag)Copyright © The Nobel Foundation 1986. - Wir danken der Nobel Stiftung, Stockholm, für die Genehmigung zum Druck dieser Übersetzung. (1986)

Karle, Jerome

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 611-626

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 16 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980704

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185-nm-Photochemie von Olefinen, gespannten Kohlenwasserstoffen und Azoalkanen in LösungProfessor Dietrich Schulte-Frohlinde zum 60. Geburtstag gewidmet (1986)

Adam, Waldemar ; Oppenländer, Thomas

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 659-670

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Notes: Die Möglichkeit, Chromophore, die nur im Vakuum-UV absorbieren, bei 185 nm direkt anzuregen, hat im letzten Jahrzehnt zur Belebung dieses Teilgebiets der Photochemie geführt. Während Reaktionen in der Gasphase bei λ〈200 nm schon eingehend untersucht worden sind, erbrachte die intensive Erforschung der 185-nm-Photochemie von organischen Verbindungen in Lösung neue Erkenntnisse. Trotz hoher Anregungsenergie werden selektive Photoreaktionen aus kurzlebigen Singulett-Zuständen (Rydberg-Photochemie) ausgelöst. Anders als bei der konventionellen Photochemie (λ〉220 nm) treten bei 185-nm-Bestrahlung bevorzugt intramolekulare Umlagerungen, Spaltungen und Isomerisierungen auf, während intermolekulare Radikalkupplungen und -abstraktionen sowie Dimerisierungen (π,π*-Anregung) nur geringügig konkurrieren. Neben der leicht möglichen Denitrogenierung photoresistenter („reluctant“) Azoalkane zeichnen sich wichtige Anwendungsgebiete der kurzwelligen Photolyse auch in der Technik (Photolithographie) und der Medizin (193-nm-Laser) ab. Die Erweiterung des Synthesepotentials der 185-nm-Photochemie - bisher auf direkte cis/trans-Isomerisierungen beschränkt -, ist eine Herausforderung für den Chemiker.

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URL: http://dx.doi.org/10.1002/ange.19860980802

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Synthese und Kristallstruktur von μ-Thiobis[tris(diethyldithiocarbamato)molybdän(IV)]-Toluol 1 : 1, einer Verbindung mit der seltenen Mo-S-Mo-Einheit (1986)

Jasim, Khalid S. ; Chieh, Chung ; Mak, Thomas C. W.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 718-719

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980807

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[m.m]Metallocenophane: Synthese, Struktur, Eigenschaften (1986)

Mueller-Westerhoff, Ulrich T.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 700-716

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Source: Wiley InterScience Backfile Collection 1832-2000

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Notes: Metallocenophane sind Metallocene, in denen die Cyclopentadienyl-Liganden intramolekular durch CmHn- oder CmHnX-Einheiten (X=Heteroatom) verbrückt sind. Zwei Hauptklassen von Metallocenophanen sind bekannt: In [m]Metallocenophanen sind die Liganden eines Metallocens durch eine oder mehrere Brücken miteinander verbunden; in [m.n]Metallocenophanen sind zwei (oder mehrere)Metalloceneinheiten durch Verbrückung zu einem Molekül vereinigt. Dieser Beitrag geht kurz auf die erste Klasse (einkernige Komplexe) ein und behandelt dann die zweite (mehrkernige Komplexe), wobei die [1.1]Metallocenophane im Vordergrund stehen. Sie kommen durch Verknüpfung zweier Metallocene durch zwei C1-Brücken zustande und zeichnen sich durch eine Vielfalt ungewöhnlicher und nützlicher Eigenschaften aus: [1.1]Metallocenophane sind konformativ sehr beweglich; Hydridabstraktion aus den CH2-Brücken ergibt Carbenium-Ionen mit starker Stabilisierung durch die benachbarten Metalloceneinheiten; Deprotonierung aus einer der CH2-Brücken gelingt überraschend leicht und führt zu der ungewöhnlichen Situation, daß eine Carbanion durch eine intramolekulare C—H…C-wasserstoffbrückenbindung stabilisiert wird; durch Protonierung beider Metalloceneinheiten kann ein Mol Wasserstoff pro Mol Metallocenophan freigesetzt werden. [1.1]Metallocenophane eignen sich als Katalysatoren für die Wasserstoff-Erzeugung aus sauren wäßrigen Lösungen.

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URL: http://dx.doi.org/10.1002/ange.19860980805

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Synthese und Struktur von [(Ph3P)3Ir(μ3-H)(μ-H)2Ag2(OSO2(OSO2CF3)(H2O)]-(CF3SO3),einem Komplex mit einer gewinkelten Ag-Ir-Ag-EinheitDiese Arbeit wurde vom CNRS (Paris) und CNR (Rom) sowie von der NATO (P. B. und A. T.) gefördert. T. M. G. C. dankt dem CNPq (Brasilien) für ein Stipendium. (1986)

Braunstein, Pierre ; Carneiro, Tania Mara Gomes ; Matt, Dominique ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 721-722

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980809

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Überbrückte [14]Annulene mit Phenanthren-Perimeter: syn-1,6:7,12-Bismethano[14]annulenDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft gefördert.Professor Heinz A. Staab zum 60. Geburtstag gewidmet (1986)

Vogel, Emanuel ; Püttmann, Wilhelm ; Duchatsch, Walter ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 727-729

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980814

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R-2-Isopropenylcyclopropan-1, 1-dicarbonsäure: Absolute Konfiguration und stereospezifische Ringerweiterung ihres DimethylestersDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft (Projekt 15/21-1 u. 2), vom Fonds der Chemischen Industrie und von der Hoechst AG gefördert.Edgar Heilbronner zum 65. Geburtstag gewidmet (1986)

Quinkert, Gerhard ; Schmalz, Hans-Günther ; Walzer, Egon ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 732-733

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Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980816

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Synthesen und spektroskopische Eigenschaften von TriafulvalenderivatenDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und vom Fonds der Chemischen Industrie gefördert.Professor Siegfried Hünig zum 65. Geburtstag gewidmet (1986)

Neidlein, Richard ; Poignée, Volker ; Kramer, Walter ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 735-736

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URL: http://dx.doi.org/10.1002/ange.19860980818

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Gezielte Synthese von Rhenamolybdatetrahedranen: Nucleophile Addition von Pentacarbonylrhenat(1 - ) an Alkin-Liganden kationischer Molybdän-KomplexeMetallorganische Lewis-Säuren, 24. Mitteilung. Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Fonds der Chemischen Industrie gefördert. - 23. Mitteilung: H. Bauer, W. Beck, J. Organomet. Chem., im Druck.Frau Professor Marianne Baudler zum 65. Geburtstag gewidmet (1986)

Beck, Wolfgang ; Müller, Hans-Joachim ; Nagel, Ulrich

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 739-740

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Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980821

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Carbin-Iridium-Komplexe: Nachweis eines Gleichgewichts zwischen Alkenyliden(hydrido)- und Carbin-Isomeren (1986)

Höhn, Arthur ; Werner, Helmut

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 745-746

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Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

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URL: http://dx.doi.org/10.1002/ange.19860980825

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t-(ET)2Au(CN)2 und t-(ET)2AuBr2, organische Radikalkationen-Salze mit twist-StrukturFür die Messung der elektrischen Leitfähigkeit danken wir Dipl.-Phys. C. P. Heidmann und Prof. Dr. K. Andres, Walther-Meißner-Institut für Tieftemperaturforschung, D-8046 Garching. (1986)

Amberger, Eberhard ; Fuchs, Helmut ; Polborn, Kurt

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 98 (1986), S. 751-753

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

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Additional Material: 2 Ill.

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URL: http://dx.doi.org/10.1002/ange.19860980829

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