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PLASTRON RESPIRATION IN AQUATIC INSECTS 总被引:3,自引:0,他引:3
W. H. THORPE 《Biological reviews of the Cambridge Philosophical Society》1950,25(3):344-390
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The apposition eyes of two diurnal insects, Sarcophaga bullata (Diptera) and Anax junius (Odonata), have been examined with the electron microscope. In the latter case only the rhabdom is described. The rhabdom of the fly consists of a central matrix and seven rhabdomeres, one for each retinula cell. The rhabdomeres show an ordered internal structure built up of transverse tubes, hexagonal in cross-section. These slender compartments running the width of the rhabdomere are 370 A in diameter. After fixation with osmium tetroxide the walls of the compartments are more electron dense than the interiors. The retinula cells contain mitochondria, and pigment granules smaller than those found in the pigment cells. These granules tend to cluster close behind the membranes which separate the retinula cells from their rhabdomeres. The rhabdom of the dragonfly is a single structure which appears to be composed of three fused "rhabdomeres," each similar to a rhabdomere of Sarcophaga. Reasons are given for believing that the rhabdom may be the site of photoreception, as well as the organ for analyzing plane-polarized light, as suggested by other workers. 相似文献
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THE RESPIRATION OF BARLEY PLANTS 总被引:8,自引:7,他引:1
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THE RESPIRATION OF BARLEY PLANTS 总被引:5,自引:4,他引:1
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THE RESPIRATION OF BARLEY PLANTS 总被引:4,自引:3,他引:1
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THE RESPIRATION OF BARLEY PLANTS 总被引:3,自引:3,他引:0
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The temperature characteristic of respiration of Azotobacter vinelandii possesses a constant value of 19,330 ± 165 over the temperature range 20–30°C. This value is independent of pH, oxygen tension, age of culture, and other factors within the limits studied. The optimum temperature of respiration is 34–35°C., with limits at about 10° and 50°C. 相似文献
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Arthur Edmunds 《BMJ (Clinical research ed.)》1903,2(2238):1322-1326
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1. Oxygen consumption measurements made while a chicken erythrocyte swells show no increase over the control value. 2. There is no change in the rate of anaerobic glycolysis in beef erythrocytes when they swell. 3. The above statements are true whether the cells swell from a shrunken condition back to the normal volume, or swell from the normal to the hemolytic volume. 4. These data add a further test of the hypothesis that a relationship exists between the cell membrane and its respiratory activity. 相似文献