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  • Electron microscopy  (6)
  • Springer  (6)
  • PANGAEA
  • 2020-2024
  • 2020-2023
  • 1975-1979  (6)
  • 1965-1969
  • 1955-1959
  • 1950-1954
  • 1977  (6)
Collection
Keywords
Publisher
  • Springer  (6)
  • PANGAEA
Years
  • 2020-2024
  • 2020-2023
  • 1975-1979  (6)
  • 1965-1969
  • 1955-1959
    • +
Year
  • 1
    Electronic Resource
    Electronic Resource
    “Sunbursts” and “christiesomes”: Cellular fragments in normal cow and goat milk (1977)
    Springer
    Cell & tissue research 185 (1977), S. 535-545 
    Details
    ISSN: 1432-0878
    Keywords: Milk (goat, cow) ; Cell fragments ; Origin ; Triglyceride synthesizing capacity ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Goats' milk includes numerous cell fragments (“christiesomes”) which originate from the mammary secretory cells, contain well preserved endoplasmic reticulum, mitochondria and lipid droplets, and are responsible for the considerable triglyceride synthesising capacity of fresh goat milk. Cows' milk shows a few such particles only after repeated oxytocin-aided milkings. Cows' milk does contain quite different particles which have a dense content with a few small vesicles and numerous microvillus-like protrusions on one side (“sunbursts”). These have not been found in goats milk. Cytoplasmic particles similar to sunbursts have been found on the surface of the mammary secretory epithelium. It is suggested that they are residues of dead cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220657
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  • 2
    Electronic Resource
    Electronic Resource
    A possible role for placental lysosomes in the formation of villous syncytiotrophoblast (1977)
    Springer
    Cell & tissue research 178 (1977), S. 411-419 
    Details
    ISSN: 1432-0878
    Keywords: Human placenta ; Lysosomes ; Differentiation of cytotrophoblast ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An ultrastructural and ultrahistochemical study of first trimester human placentae confirms previous reports that the cytotrophoblastic cells show a spectrum of differentiation, that dissolution of the limiting membrane of the cytotrophoblastic cells occurs and that fragments of free membrane can be found in the syncytiotrophoblast. There is an aggregation of primary lysosomes in the region of approximation of the cytotrophoblast to the syncytiotrophoblast, free lysosomal enzymes are found in the space between the two trophoblastic components, secondary lysosomes have been noted in the vicinity of fragmenting cytotrophoblastic cell membrane and the incorporation of a segment of free membrane into a vesicular structure has been noted. It is suggested that placental lysosomes mediate the dissolution of the cytotrophoblastic cell membranes that is a necessary prerequisite for their full differentiation into syncytiotrophoblast and it is further suggested that one of the principal roles of placental lysosomes is in the structural refashioning of the organ that occurs during the first trimester.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218704
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  • 3
    Electronic Resource
    Electronic Resource
    DNA-synthesizing cells in human fetal thymus (1977)
    Springer
    Cell & tissue research 178 (1977), S. 333-339 
    Details
    ISSN: 1432-0878
    Keywords: Thymus, Human fetus ; Lymphocytes ; DNA synthesis ; Autoradiography ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Fragments and suspensions of human fetal thymus were incubated in the presence of 3H-TdR to permit study of the distribution and morphology of DNA-synthesizing cells. Results of light and EM autoradiography showed that 1. although DNA-synthesizing cells were present in the medulla, the vast majority of these cells were localized in the thymic cortex, 2. cells with the typical EM appearance of small lymphocytes and lymphoid blast cells both synthesized DNA, and 3. cells in S-phase were predominantly 8 to 12 μm in size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218698
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  • 4
    Electronic Resource
    Electronic Resource
    Fine structure and peroxidatic activity of rat blood monocytes (1977)
    Springer
    Cell & tissue research 185 (1977), S. 1-16 
    Details
    ISSN: 1432-0878
    Keywords: Monocyte (Rat) ; Type of granules ; Peroxidase ; Catalase ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Rat blood monocytes contain granules of two types, primary and secondary granules, which can be distinguished on morphological grounds. Secondary granules have a halo between the limiting membrane and the matrix; primary granules have no halo and are generally more elongate than the secondary granules. In addition, there are differences in the distribution of the diameters of these two types of granules. The cytochemical characteristics of the peroxidatic activity of these granules were investigated by using different prefixation conditions in combination with a number of DAB media differing in pH and H2O2 concentration. Prolongation of the prefixation and increasing the pH of the incubation medium increased the staining intensity of the secondary granules and decreased the staining intensity of the primary granules. In unfixed cells peroxidatic activity could be demonstrated only in the primary granules. It is concluded from the present findings that peroxidase occurs in primary granules and not in secondary granules, whereas catalase is present in secondary granules but probably not in primary granules. No evidence was found for the presence of microperoxisomes in rat blood monocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226665
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  • 5
    Electronic Resource
    Electronic Resource
    The hypothalamo-choroidal tract (1977)
    Springer
    Cell & tissue research 178 (1977), S. 129-141 
    Details
    ISSN: 1432-0878
    Keywords: Choroid plexus ; Vasopressin ; Neurosecretion ; Rat ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Light and electron microscopic examination of choroid plexuses from lateral ventricles of water-deprived and subcutaneously or intravenously vasopressin administered rats reveal morphologic changes typical for vasopressin responsive fluid transporting epithelia during hormonal stimulation. Ultrastructural changes noted in both dehydrated and vasopressin treated animals included: the frequent occurrence of choroidal “dark” cells, dilatation of the lateral and basal intercellular spaces, increased vacuolization of the apical cytoplasm, and a change in microvillar conformation from the normal clavate type to those with a filiform shape. On the basis of the ultrastructural changes observed it is proposed that the choroid plexus be regarded as a target tissue for vasopressin. These findings indicated that a vasopressinmediated transchoroidal cerebrospinal fluid absorption capability exists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232830
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  • 6
    Electronic Resource
    Electronic Resource
    Localization of neurophysin in the rat supraoptic nucleus (1977)
    Springer
    Cell & tissue research 179 (1977), S. 467-473 
    Details
    ISSN: 1432-0878
    Keywords: Neurophysin ; Supraoptic nucleus ; Neurosecretory granules ; Electron microscopy ; Immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Localization of neurophysin in neurons of the supraoptic nucleus was accomplished using an unlabeled-antibody, post-embedding, immunoperoxidase technique. Neurophysin was exclusively associated with neurosecretory granules within cell bodies of supraoptic neurons and their processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219849
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