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Seasonal changes of the photosynthetic capacity of the Antarctic macroalga Adenocystis utricularis (Bory) Skottsberg 总被引:1,自引:1,他引:0
Summary Photosynthetic oxygen evolution from Antarctic macroalgaAdenocystis utricularis, collected from littoral zone of Admiralty Bay of King George Island (South Shetland), was measured under standard laboratory conditions during a 9-month study period. During autumn and winter the photosynthetic apparatus of the alga revealed an increased capacity to use low irradiance. This coincided with increasing concentrations of chlorophyll a+c. In parallel respiration rates measured at the average monthly water temperature were lower in winter than in summer. 相似文献
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C Crone J Frokjaer-Jensen JJ Friedman O Christensen 《The Journal of general physiology》1978,71(2):195-220
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M Maleszewski 《Molecular reproduction and development》1990,27(3):244-248
A micromethod is presented which makes possible the analysis of mouse sperm nucleus decondensation in vitro using very small volumes of cytoplasmic preparations, even smaller than 1 microliters. We show that cell-free extracts obtained from interphase HeLa cells as well as lysates from mouse eggs and embryos can sustain early stages of mouse sperm nucleus transformation, provided the sperm nuclear envelope is damaged or removed. 相似文献
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Shoji Kuretake Marek Maleszewski Ako Tokumasu Hirokazu Fujimoto Ryuzo Yanagimachi 《Molecular reproduction and development》1996,44(2):230-233
Mice carrying two t complementary haplotypes (tw5/tw32) are totally sterile. Their spermatozoa have poor motility and fertilize neither zone-intact nor zona-free oocytes, even though they are structurally indistinguishable from control (wild-type) spermatozoa. However, when injected directly into oocytes, these infertile spermatozoa are able to participate in normal development. This suggests that infertility of tw5/tw32 male (spermatozoa) is more likely to be due to poor sperm-oocyte interaction than to genetic incompetence of sperm nuclei. © 1996 Wiley-Liss, Inc. 相似文献
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