Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • Ultrastructure  (3)
  • 1
    ISSN: 1432-0878
    Keywords: Postnatal development ; Olfactory epithelium ; Supporting cells ; Receptor cell dendrites ; Ultrastructure ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The present electron-microscopical study reports ultrastructural changes occurring in the supranuclear region of the supporting cells of the rat olfactory epithelium during the first 16 days of postnatal life. These changes are concerned with the enclosure of receptor cell dendrites and an increase in the amount of smooth endoplasmic reticulum, which has a specific distribution in the supporting cell. An increase in microvillous projections at the free cell surface is also observed. Moreover, this report demonstrates that the cytoarchitecture of the apical portion of the olfactory epithelium at the 16th day of postnatal life is similar, with respect to the relationship between supporting cells and receptor cell dendrites, to that of adult animals.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-0878
    Keywords: Platelets ; Storage ; Ultrastructure ; Freeze fracture ; Transmission electron microscopy ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We report the ultrastructural changes occurring in human platelets during eight days of storage. Extension of pseudopodia is frequently observed, but a concentration of organelles in the centre of the platelets is found only in a minor fraction (∼5%). Striking changes can be observed in both the granules and the open canalicular system. In fresh platelets, the latter often has the form of stacked membranes that have no lumen, but these membranes separate and spread with increasing storage time. However, the openings of this system on the outer surface of the platelet remain unchanged. Some of these features differ from the morphological description of platelets activated by thrombin or ADP, and suggest that the storage lesion is the result of a prolonged weak activation that leads to an incomplete release reaction within the first five days.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 122 (1971), S. 574-583 
    ISSN: 1432-0878
    Keywords: Rectal gland ; Rabbit ; Ultrastructure ; Extrusion mechanism ; Lamellated bodies ; Cytolysosomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Im Anschluß an eine lichtmikroskopisch-morphologische und histochemische Studie wurde die Glandula rectalis von Kaninchen elektronenmikroskopisch untersucht. Folgende Befunde wurden erhoben: 1. Die Glandulae rectales von Kaninchen sind tubulöse Drüsen. Das einschichtige kubische bis hochzylindrische Epithel bildet teilweise blasen- und kuppelörmige Protrusionen aus. 2. Verschiedene Zustandsbilder einer Abschnürung von apikalen Blasen und von Protuberanzen, die das Äquivalent einer modifizierten Extrusion sind, werden beschrieben. Es handelt sich bei diesen Strukturen nicht um Fixierungsartefakte. 3. Die elektronenmikroskopische Analyse ergab ferner, daß viele Drüsenzellen in ihren apikalen Arealen helle und dunkle Sekretgranula enthalten. 4. Das Drüsenepithel enthält im Gegensatz zu anderen Hautdrüsen des Kaninchens wenig Mitochondrien, spärliche Ergastoplasmabezirke und unauffällige Golgi-Komplexe. 5. Besonders eindrucksvoll ist das Vorkommen einer erstaunlich großen Zahl von Lamellenkörpern und großen Cytolysosomen.
    Notes: Summary Following a previous light microscopic morphological and histochemical investigation the rectal gland of rabbits was studied by electron microscopy. The results are as follows: 1. The rectal gland of the rabbit consists of tubuli. Its secretory cells are cuboidal and columnar elements with prominent apical cytoplasmic caps and protrusions extending into the glandular lumen. 2. Swollen cellular apices and protuberances apparently being pinched off—equivalents of an apocrine extrusion—are described. These structures do not represent artefacts caused by fixation. 3. Examination by electron microscopy indicated that there is a marked number of light and dark secretory granules in the apical parts of the cells. 4. Mitochondria, arrays of granular endoplasmic reticulum and Golgi complexes are fewer than in other skin glands of rabbits. 5. An interesting observation is the presence of numerous lamellated bodies and big cytolysosomes.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...