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  • 1
    Publication Date: 1971-06-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 27 (1971), S. 700-701 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Diameters of mitochondria of the external zona fasciculata of the adrenal cortex of 4 female and 4 male Sprague-Dawley-rats are determined with the image analyzing computer Quantimet 720. On the average females have significantly larger mitochondria. The mitochondria show an ellipsoid deformation, the long axes are orientated parallel to the columns of the zona fasciculata.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 116 (1971), S. 136-150 
    ISSN: 1432-0878
    Keywords: Adrenal cortex ; Rat ; Sex difference ; ACTH ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die Nebennierenrinde von 178 Sprague-Dawley-Ratten wurde elektronenmikroskopisch von der 1.–12. Lebenswoche unter Normalbedingungen sowie nach s.c. Injektion von 3 IE ACTH/100 g Körpergewicht innerhalb von 2 min — 24 Std untersucht. Ab der 5. Lebenswoche unterscheiden sich die Nebennieren von Weibchen im Bereich der äußeren Zona fasciculata durch Kernvergrößerung, größere Mitochondrien und kleindisperse Liposomen von denen der Männchen. Zyklusbedingte Schwankungen in der Ultrastruktur der weiblichen Nebennierenrinde bestehen nicht. Nach ACTH-Applikation nähert sich das Nebennierenbild des Männchen innerhalb von 30 min dem des unbehandelten Weibchens. Außerdem kommt es bei beiden Geschlechtern durch ACTH zu einer Dispersion und Reduktion der Liposomen, Vergrößerung des Golgiapparates und der Zellkerne, Ausweitung des endoplasmatischen Retikulums und Vermehrung der Mikrovilli. Der Geschlechtsdimorphismus wird funktionell erklärt.
    Notes: Summary 178 Sprague-Dawley-rats were studied by electron microscopy from the 1st to the 12th week of life under normal conditions and after s. c. injection of 3 I. U. ACTH/100 gbodyweight from 2 min to 24 hours. Beginning with the 5th week of life females differ from males by small dispersed liposomes and enlarged nuclei and mitochondria in the outer z. fasciculata. There is no change in the ultrastructure of the female adrenal cortex depending on the sexual cycle. After application of ACTH the adrenal cortex of males assimilates to the untreated females within 30 min. After ACTH-application both sexes show dispersion and reduction of liposomes, dilation of endoplasmatic reticulum, increasement of microvilli and enlargement of the Golgi apparatus. The sex-dimorphism is interpreted by functional differences.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 149 (1974), S. 113-120 
    ISSN: 1432-0878
    Keywords: Adrenal cortex ; Rat ; Sex-hormones ; Ultramorphometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Ultramorphometrisch wurde nach dem Verfahren von Rohr et al. (1971) die äußere Zona fasciculata von Sprague-Dawley-Ratten bei 5 Gruppen zu je 4 Tieren verglichen: Männchen, Weibchen im Diöstrus, Weibchen im Östrus, männliche und weibliche Kastraten (Kastration am 4. Lebenstag). Die Nebennierenrindenzellen der äu\eren Fasciculata sind bei Weibchen gegenüber denen normaler Männchen hypertroph: Weibchen im Diöstrus zeigen gegenüber Männchen größere Einzelzellen mit vermehrtem glattem endoplasmatischem Reticulum, erhöhten Einzel- und Gesamtvolumina der Mitochondrien sowie einem höheren Lipoidgehalt bei stärkerer Dispersion der Liposomen. Dieselben funktionsspezifischen Strukturen nehmen bei den Weibchen im Östrus noch weiter zu. Die Kastration der Weibchen am 4. Lebenstag führt zu einer Reduktion der funktionsspezifischen morphometrischen Parameter unter die Werte der Diöstrus-Tiere. Männliche Kastraten gleichen die Werte ihrer funktionsspezifischen Strukturen weitgehend denen der Weibchen im Diöstrus an. Nach Kastration am 4. Lebenstag zeigen weibliche Tiere somit etwas niedrigere morphonietrische Parameter in der äußeren Zona fasciculata als die männlichen Kastraten.
    Notes: Summary With the method of Rohr et al. (1971) the outer zona fasciculata of Sprague-Dawley-rats was compared ultramorphometrically in 5 groups of 4 animals each: males, females during diestrus, females during estrus, male and female castrates (castration on 4th day of life). Adrenal cortical cells of the outer fasciculata in females are hypertrophic in comparison with those of normal males: females during diestrus show in comparison with males larger individual cells with increased SER, increased volume of the individual mitochondrium and total volume of mitochondria as well as an increased lipoid content together with a more pronounced dispersion of liposomes. The same function-specific structures show a further increase in females during estrus. Castration of females on the 4th day of life leads to a reduction of the function-specific morphometric parameters below the values of the diestrus animals. Male castrates show adaption of the values of their function-specific structures towards those of females during diestrus. Following castration on the 4th day of life, female animals thus show somewhat lower morphometric parameters in the outer zona fasciculata than male castrates.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 13 (1979), S. 67-87 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The biocompatibility of alumina ceramic was tested by means of macrophage cultures, intraperitoneal (i.p.) and intramuscular (i.m.) application of powdered particles in rats, and by implantation of solid samples in the paravertebral muscles and the condylus of femur. No acute cytotoxicity was found in macrophage cultures. The i.p. and i.m. application of powdered particles in the beginning showed a granulocytic reaction, later followed by a histiocytic reaction. Also, the morphological changes in the organs of reticulo histiocytic system (RHS) are shown. In the solid sample implantation, the fibrogenetic stimulus is measured by morphological analysis of the connective tissue membrane around the sample. The importance of the individual cell observation by transmission-electron microscope (TEM) examination is evidenced. The experimental results are compared to the environmental reaction of smaller animal-adapted prostheses and prostheses having been implanted in human patients. Good biocompatibility is confirmed by these investigations; also regarding central position of the macrophages, the environmental reaction due to implant material is shown.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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