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  • Chloroplast  (1)
  • Motor apparatus  (1)
  • Springer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of 2,4-dichlorophenoxyacetic acid on the structure and function of developing chloroplasts (1977)
    Springer
    Planta 137 (1977), S. 65-69 
    Details
    ISSN: 1432-2048
    Keywords: Auxin ; Chlorophyll content ; Chloroplast ; Photosynthetic rate ; Raphanus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dark-grown radish seedlings (Raphanus sativus L.) were sprayed with 10-3 mol·l-1 2,4-dichlorophenoxyacetic acid and then were exposed to a 14:10 light: dark cycle. Cotyledon samples from these seedlings and unsprayed controls were taken for electron microscopy, chlorophyll determinations, and photosynthetic rate measurements at regular intervals for 72 h. A normal development of etioplasts to chloroplasts with formation of typical grana-fret work system was observed in the control cotyledons. The chloroplasts in the 2,4-D-treated cotyledons showed changes in the organization of the grana thylakoids; these thylakoids being more appressed to each other than in the controls. The chlorophyll content of treated plants was less than that of controls but the rate of chlorophyll biosynthesis was unaffected. The photosynthetic rate/mg chlorophyll was considerably higher for treated plants suggesting that 2,4-D treatment resulted in decreased size of the photosynthetic unit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394437
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of gossypol on the ultrastructure of rat spermatozoa (1979)
    Springer
    Cell & tissue research 204 (1979), S. 293-296 
    Details
    ISSN: 1432-0878
    Keywords: Gossypol ; Spermatozoa ; Motor apparatus ; Sterility ; Electron ; Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Gossypol was found to induce sterility in male rats when administered orally. A reduction in the number of spermatozoa in the epididymis from the gossypol-treated rats was observed when compared to the control animals. An examination of the spermatozoa from the treated rats showed the following ultrastructural modifications: disorganization of the mitochondrial sheath and missing cell membrane from the middle piece, broken cell membrane and missing members of both outer fibers and inner microtubules of the principal piece, and broken cell membrane of the sperm head. Serial mating experiments proved that gossypol-treated males were indeed sterile. The results suggest that gossypol at low concentrations is able to affect the motility of spermatozoa, thus contributing to its contraceptive action.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234640
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    Paper (German National Licenses)
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