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排序方式: 共有460条查询结果,搜索用时 187 毫秒
1.
T. K. Antal E. E. Graevskaya D. N. Matorin A. A. Volgusheva V. A. Osipov T. E. Krendeleva A. B. Rubin 《Biophysics》2009,54(4):481-485
The effect of methylmercury and copper ions on the kinetics of light induction and dark relaxation of the variable fluorescence of chlorophyll a has been studied on cultures of unicellular alga Chlamydomonas moewusii. Methylmercury was effective at much lower levels. The toxicants at concentrations that did not decrease the photochemical activity of PS II (F v/F m) did affect the electron transport on the acceptor side of PS II, nonphotochemical quenching of excitation in the antenna, and reoxidation of the quinone pool. Our results indicate that this approach can be used for detecting the changes in plant cells at the early stages of toxicant action. 相似文献
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S. P. Kharitonov D. E. Nowak A. I. Nowak N. A. Egorova S. A. Korkina D. V. Osipov O. V. Natal’skaya 《Biology Bulletin》2009,36(5):469-478
Red-breasted goose colonies have been studied near Medusa Bay (73°21′N, 80°32′E), on the northwestern Taimyr Peninsula, and
along the Agapa River (70°11′N, 86°15′E) down to its mouth (71°26′N, 89° 13′E), in the central Taimyr Peninsula. Red-breasted
geese nesting near peregrine falcons are protected by the falcons from arctic foxes; however, they are sometimes attacked
by the falcons themselves. In the colonies near peregrine falcon nests, the vast majority of goose nests were situated no
farther than 100 m from the falcon nest. When food is abundant, falcons protect a larger area around their nest. The distance
between the falcon nest and the surrounding goose nests is inversely related to the falcon’s activity. In years of higher
falcon activity, falcons prevent red-breasted geese from nesting as close to their nest as in years of lower falcon activity.
Additional stimuli are required for red-breasted geese to form colonies near rough-legged buzzard nests. The distance between
snowy owl nests and red-breasted goose nests was smaller when arctic foxes were abundant than when they were scarce. 相似文献
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Heparin proved to be essential component in bone resorption. In vitro heparin activated the effects of parathyroid hormone in respect to bone resorption, but heparin alone was incapable of causing the resorption. 相似文献
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E D Bershadskaia N G Fish P P Shev'ev M A Osipov V I Ogarkov 《Zhurnal mikrobiologii, epidemiologii, i immunobiologii》1986,(9):32-35
Anabol and blastolysin preparations obtained from L. bulgaricus may contain surface structural components of the initial strain with adhesion activity; of these, one is similar in specificity to L. casei adhesin and the other, to L. plantarum adhesin. The antigenic activity of anabol and blastolysin, evaluated in the immunodiffusion test, does not correlate with their capacity for binding the receptors of susceptible bacterial cells, determined in the Lactobacillus-induced hemagglutination inhibition test. 相似文献
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A N Maianski? S P RVssanov D G Astaf?v O A Osipov 《Zhurnal mikrobiologii, epidemiologii, i immunobiologii》1990,(3):65-68
The capacity of S. aureus peptidoglycan (PG) for inducing the luminol-dependent chemiluminescence of human lymphocytes has been studied. Lymphocytes taken from adult donors have been found to give dose-dependent reaction to S. aureus PG, while lymphocytes from newborn infants have been inert under the same conditions. Essential differences in the kinetics of response to PG (the maximum intensity of chemiluminescence occurs in 25-30 minutes) and to phytohemagglutinin (the maximum intensity is reached in 1 minute) were observed. These results are considered as the manifestation of specific sensitization to bacterial peptidoglycans, which may be rapidly detected by reactive chemiluminescence. 相似文献
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Biophysics - Abstract—In this study we present a modified method for determination of the antioxidant capacity of biological fluids and tissues based on the use of a chemiluminescent model... 相似文献
10.
JG Hansen W Gao J Dupuis GT O’Connor W Tang M Kowgier A Sood SA Gharib LJ Palmer M Fornage SR Heckbert BM Psaty SL Booth SUNLIGHT Consortium Patricia A Cassano 《Respiratory research》2015,16(1)