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  • 1
    Electronic Resource
    Electronic Resource
    Role of ovarian follicle cells in vitellogenesis and oocyte resorption inCapitella sp. I (Polychaeta) (1984)
    Springer
    Marine biology 79 (1984), S. 133-144 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Capitella sp. I has a short generation time, is polytelic and produces broods of relatively large, yolky eggs at intervals of as short as 5–7 d at 20°C. The follicle cells surrounding vitellogenic oocytes in the medial portion of the ovary contain large nuclei, extensive arrays of rough endoplasmic reticulum and Golgi complexes. The coelomic surfaces of follicle cells in the outer layer are covered by blade-like microvilli, which project into the coelom. In the dorsal and lateral portions of the ovary, where mature oocytes are found, the follicle cells are covered by flat, stellate-shaped, peritoneal cells that resemble the podocytes of many invertebrate excretory organs and of the mammalian glomerulus. Changes occurring in the ovary during resorption of oocytes in the middle to advanced stages of vitellogenesis are described. Oogonia and previtellogenic oocytes are not resorbed and perhaps subsequently undergo vitellogenesis. The ovary in this highly opportunistic polychaete species may play a significant regulatory role in the control of reproduction by producing yolk precursors, regulating their uptake from the coelomic fluid via the activity of the follicle cells and by resorbing mature oocytes in response to stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00951822
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of cardenolides of Convallaria majalis by high pressure liquid chromatography (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 37-38 
    Details
    ISSN: 0935-6304
    Keywords: HPLC ; Cardenolides in Convallaria majalis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cardenolides of Convallaria majalis were separated by reverse-phase HPLC on Partisil PXS 10/25 ODS columns using 25% acetonitrile as mobile phase. Periplorhamnoside, convallatoxin and either convallatoxol or convalloside were resolved from glycoside mixtures. Convallatoxin and periplorhamnoside were identified in plant extracts, convalloside and convallatoxol were not resolved from non-cardenolide material present in leaf extracts.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040110
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  • 3
    Electronic Resource
    Electronic Resource
    Separation of digitalis cardenolides by HPLC (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 239-241 
    Details
    ISSN: 0935-6304
    Keywords: Liquid Chromatography ; Cardiac steroid separation for cardiotonic drug quality control ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The separation of Digitalis cardenolides has been carried out by HPLC on an adsorbent column. By choice of suitable mobile phase, isocratic elution permitted resolution of mixtures of (a) aglycones, (b) secondary glycosides, and (c) primary glycosides, while gradient elution provided a means of resolving more complex mixtures of these cardiac steroids. HPLC could therefore be used in the quality control of cardiotonic drugs replacing the TLC tests for related compounds currently used, and by suitable calibration could replace the colorimetric assay procedure normally used for such drugs.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040512
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  • 4
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    Role of ovarian follicle cells in vitellogenesis and oocyte resorption inCapitella sp. I (Polychaeta) (1984)
    Springer
    Details
    Publication Date: 1984-01-01
    Print ISSN: 0025-3162
    Electronic ISSN: 1432-1793
    Topics: Biology
    Published by Springer
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