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  • 1985-1989
  • 1975-1979  (111)
  • 1970-1974
  • 1975  (111)
  • Electron microscopy  (111)
  • 101
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 163 (1975), S. 99-110 
    ISSN: 1432-0878
    Keywords: Central neuropile ; Planorbis corneus ; Synapses ; Spinule complexes ; Varicosities ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The neuropile in the central ganglia of Planorbis corneus was studied by electron microscopy, using different fixatives. Several types of specialization were observed in the membranes of adjacent axonal processes, varying from only slight membrane thickenings to structures resembling desmosomes. Specialized structures similar to the ‘spinule complexes’ in mammalian brain are widely distributed in certain areas of neuropile. They consist of a small projection which invaginates a neighbouring neurone; the membranes are closely apposed and there is associated electron-dense material. The problem of identifying chemical synapses in this tissue is discussed. Many axonal processes are varicose, and it is suggested that varicosities may also be sites of transmitter release.
    Type of Medium: Electronic Resource
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  • 102
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 163 (1975), S. 415-431 
    ISSN: 1432-0878
    Keywords: Periodontal ligament ; Rodent incisor ; Fibroblasts ; Cilia ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Solitary cilia occur in motile as well as in non-motile fibroblasts of the periodontal ligament. The cells which moved with the erupting incisor are bipolar and oriented with their long axes parallel to the tooth surface. In cross section these cells have a flattened appearance. Cilia are localized in close vicinity to the nuclear area and show a definite orientation with respect to the transverse cell axis. The frequency of occurrence of this organelle was estimated from the percentage of diplosomes containing a basal body. Analysis of the composition of the paired structures indicated that at least 70 per cent of the fibroblasts are ciliated. The frequency of cilia in motile fibroblasts does not differ from that in non-motile cells suggesting that the presence of this organelle is not directly associated with cell locomotion.
    Type of Medium: Electronic Resource
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  • 103
    ISSN: 1432-0878
    Keywords: Carotid body ; Duck ; Cervical vagotomy ; Innervation ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Carotid bodies of ducks show no detectable changes in ultrastructure up to periods of four weeks following the removal of 2–3 cm of the cervical vagus (decentralization). This indicates that the majority, and possibly all the nerves terminating on the glomus cells are afferent (sensory) in nature. These nerve endings are in reciprocal synaptic contact with the glomus cells and therefore have efferent and afferent functions. Theories concerning the carotid body receptor mechanism are discussed with particular reference to those theories which ascribe functions to the reciprocal synapses.
    Type of Medium: Electronic Resource
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  • 104
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 156 (1975), S. 359-376 
    ISSN: 1432-0878
    Keywords: Mouse-liver ; Human-IgG ; Lysosomes ; Fluorescent antibody technique ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Human IgG is stored in the form of remarkable droplets in the cytoplasm of mouse hepatocytes following intravenous injection. 2. The earliest protein uptake occurs within 1 minute after injection and droplets can be found up to 32 hours thereafter; 64 hours p.i. the foreign protein is no longer visible in hepatocytes. 3. Electron microscopy reveals that the uptake occurs by a process of “macropinocytosis”. The resulting protein droplets fuse with primary lysosomes and are transformed into phagolysosomes. 4. At the same time as the phagolysosomes are formed the IgG-droplets loose their immunological activity-as early as 2 hours after injection.
    Type of Medium: Electronic Resource
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  • 105
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 156 (1975), S. 411-416 
    ISSN: 1432-0878
    Keywords: Acrosome ; Spermatid ; Budgerigar ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The development of the acrosome of the budgerigar spermatid was studied under the electronmicroscope. The acrosome arises from a granule derived from the Golgi apparatus which interacts with the nucleus to form a cone shaped acrosomal cap and a perforatorium. A quantity of cytoplasm and plasma membrane is captured from the cell periphery and incorporated into the substance of the acrosome. The possible significance of the developmental phases and comparative avian spermatology is discussed.
    Type of Medium: Electronic Resource
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  • 106
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 156 (1975), S. 475-482 
    ISSN: 1432-0878
    Keywords: Annulate lamellae ; Spermatocytes ; Grasshoppers ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Intranuclear and cytoplasmic annulate lamellae were studied in grasshopper spermatocytes (Melanoplus) with the electron microscope. Although cytoplasmic annulate lamellae were observed in all three species examined, intranuclear annulate lamellae were found in only one species. The intranuclear annulate lamellae encompass certain nuclear material adjacent to the nuclear envelope forming a vesicle that is extruded into the spermatocyte cytoplasm. In this same species, cytoplasmic annulate lamellae are seen contiguous with granular masses of varying size. These structures were noted as being morphologically indistinguishable from the “yolk nuclei” of dragonfly oocytes (Kessel and Beams, 1969; Kessel, 1973).
    Type of Medium: Electronic Resource
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  • 107
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 157 (1975), S. 165-184 
    ISSN: 1432-0878
    Keywords: Pituitary gland, posterior ; Hypothalamo-hypophyseal system ; Cyclostomes ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pars intermedia of the adult lamprey is separated by perivascular spaces and a capillary plexus from the pars nervosa. No penetration of nerve fibers into the pars intermedia was found. The pars nervosa, which constitutes the posterior wall of the infundibulum, consists of an ependymal layer and a fuchsinophilic fiber layer; the latter contains at least four different types of axonal endings. The pars intermedia is avascular and is composed of a small proportion of non-secretory cells and a large proportion of secretory cells. The secretory granules in the cells of the pars intermedia seem to be discharged toward the capillaries that separate the pars intermedia from the pars nervosa. Although no direct nervous or vascular connections were found between the pars nervosa and pars intermedia, a mechanism of control of secretory activity in the pars intermedia cells by the central nervous system appears likely.
    Type of Medium: Electronic Resource
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  • 108
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 158 (1975), S. 205-213 
    ISSN: 1432-0878
    Keywords: Sertoli cell ; Crystalloid ; Swine ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Spindle or needle-shaped crystalloids are observed in Sertoli cells of the intersex and experimental cryptorchid swine in the light and electron microscopes. Small crystalloids are also observed in Sertoli cells of the normal swine only by electron microscopy. These crystalloids consist of fine filaments. The filaments are about 5 nm in diameter and arranged parallel to the long axis of the crystalloid. In cross sections of the crystalloid, the close packing of the filaments shows hexagonal arrays. The interfilamentous distance is about 5 nm. In all animals examined, bundles of short filaments, which are 5 nm in diameter, are observed in the basal part of the Sertoli cells. Ultrastructural similarities among the crystalloids, the bundles of fine filaments, and the filamentous layer in the junctional specialization of the Sertoli cell are shown. These morphological similarities suggest that the crystalloids are formed by the aggregation of the bundles in the Sertoli cells of azoospermic testes.
    Type of Medium: Electronic Resource
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  • 109
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 164 (1975), S. 481-501 
    ISSN: 1432-0878
    Keywords: Pars intermedia ; Rabbit ; Fetal, perinatal ; Cytodifferentiation ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The developing pars intermedia (PI) of rabbits of between 14 days post coitum (PC) and one day post partum (PP) have been studied by light and electron microscopy. Cell division is marked until 4th week PC, after which it is reduced. The (PI) loses its homogeneity by the 5th week PC due to localisation both intrinsic and invading cells and blood vessels. Four groups of parenchyma cells are recognisable: Pi-glandular cells, interstitial cells, ACT-type cells and a heterogeneous group of dark cells. The ultrastructure of the ACT-type cells in the rabbit PI are here described for the first time. The differentiation of these cell types has been traced from 14 days PC to 32 days PC, in particular ACT-type cells are shown to develop in situ and the significance of this is discussed. In the PI-glandular cells dense cored granules appear first on the 15th day PC which is one day before any nerve connection is made with the primitive neural lobe and more than a week before vascularisation. Thereafter granularity increases until parturition when there is a phase of degranulation. Relatively electron lucent, larger vesicles are not found until 4th week PC.
    Type of Medium: Electronic Resource
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  • 110
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 165 (1975), S. 1-11 
    ISSN: 1432-0878
    Keywords: Rabbit seminal vesicle ; Rabbit seminal plasma ; Genital tract secretion proteins ; Electron microscopy ; Disc electrophoresis ; Immunoelectrophoresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The secretion of the rabbit seminal vesicle has been investigated by morphological and biochemical means. Apical regions of seminal vesicle epithelial cells show highly active protein synthesizing and releasing organells. The secretory proteins released are analysed by disc-electrophoresis and three different immunological procedures. There is evidence for the presence of an uteroglobin-like antigen in seminal vesicle secretion. Comparison with seminal plasma indicates that the uteroglobin-like protein is also present in this fluid. The immunological and electrophoretical identity of rabbit uteroglobin, obtained from the uterus, with “male uteroglobin” is obvious, but molecular-biochemical and biological identity awaits further clarification. The demonstration of uteroglobin-like antigen in the male as in the female points towards new aspects in reproductive and contraceptive research.
    Type of Medium: Electronic Resource
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  • 111
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 196 (1975), S. 113-126 
    ISSN: 1435-702X
    Keywords: Orbital rhabdomyosarcoma ; Light microscopy ; Electron microscopy ; Tumor combination therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wird über die Krankheitsverläufe bei 7 Knaben mit primärem Rhabdomyosarkom der Orbita berichtet und eine Übersicht über diesen häufigsten malignen Orbitatumor im Kindesalter gegeben. Auf die besondere diagnostische Problematik wird eingegangen. Eine exakte morphologische Diagnose, die gegenwärtig beim Rhabdomyosarkom vielfach noch auf erhebliche Schwierigkeiten stößt, ist Voraussetzung einer adäquaten Kombinationstherapie, die Heilungen in mehr als der Hälfte der Fälle ermöglicht. In diesem Zusammenhang wird auf den großen Wert der Elektronenmikroskopie für die Abgrenzung dieser Malignome von anderen Malignomen einschließlich des sog. Retikulosarkoms hingewiesen. Im Vergleich zu den Erhebungen anderer Autoren fällt bei den eigenen Patienten die relativ hohe Rate später Todesfälle auf.
    Notes: Summary The clinical course of orbital rhabdomyosarcoma is described in seven male children. A survey of the literature on the subject is given. Particular attention is paid to certain diagnostic problems of this most frequent orbital malignant primary in childhood. An adequate combination therapy which results in cure in more than half of the patients should be employed provided that an exact morphological diagnosis is made; this still causes often great difficulty. Electron microscopy is of great value in distinguishing this type of tumor from other malignancies, including the so-called reticulosarcoma. In comparison with the case material of other authors, there was a relatively high rate of late deaths in our patients.
    Type of Medium: Electronic Resource
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