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排序方式: 共有565条查询结果,搜索用时 187 毫秒
91.
92.
Yu. S. Akishev M. A. Medvedev A. P. Napartovich A. V. Petryakov N. I. Trushkin A. G. Shafikov 《Plasma Physics Reports》2017,43(4):472-479
The article is devoted to extending the applicability of the probe diagnostics to the range of higher pressures of the plasma-forming gas by taking into account the effect of the probe shadow on the anode. The probe current–voltage characteristic in the diffuse plasma of a dense gas in a strong electric field was measured, and the influence of the probe potential and probe current on the dimensions of the probe shadow on the anode was studied experimentally. The experiments were carried at different currents of a steady-state glow discharge and different velocities of the gas flow through the discharge. The plasma-forming gas was nitrogen at a pressure of P = 100 Torr. 相似文献
93.
The regulatory decrease in the volume of principal cells of collecting ducts to hypoosmotic shock has been investigated experimentally and using the mathematical modeling. A mathematical model of the response of collecting duct principal cells to hypotonic shock has been constructed on the basis of the experimental time course of changes in cell volume measured by the fluorescent dye Calcein. It was shown that the regulatory decrease in volume under hypotonic conditions occurs via a marked release of osmolytes and is accompanied by a decrease in water permeability of the cell membrane. The mathematical modeling of transmembrane transport processes allowed us to quantitatively estimate the changes in membrane water permeability, which decreased tenfold, from 2 x 10(-1) cm/s to 2 x 10(-2) cm/s. It was also shown that the effective regulatory decrease in the volume of collecting duct principal cells in hypotonic medium results from a significant increase in membrane permeability for K+, Cl-, and organic anions. 相似文献
94.
Ilyaskin A. V. Baturina G. S. Medvedev D. A. Ershov A. P. Solenov E. I. 《Biophysics》2011,56(3):516-524
The reaction of rat kidney collecting duct principal cells to hypotonic shock was studied. The changes in cell relative volume
were measured using fluorescent dye calcein, and a mathematical model based on our experimental results was developed. It
was shown that regulatory volume decrease is mainly provided by significant release of osmolytes from the cell and decrease
of the plasma membrane water permeability. Using our model, we calculated the membrane water permeability and found it to
decrease from 2 · 10−1 to 2 · 10−2 cm/s. We conclude that for effective RVD to occur, a dramatic increase in the membrane permeability to K+, Cl− and organic anions is necessary. 相似文献
95.
Fleas fauna of the Caucasus is considered, possible ways of its formation are discussed. Caucasian fleas belong to 155 species and 40 genera; 23 species are endemics. Hypothesis on Western Palearctic and Eastern Palearctic sources of the Caucasian fleas' fauna formation are proposed. 相似文献
96.
Besio WG Liu X Wang L Medvedev AV Koka K 《International journal of neural systems》2011,21(2):139-149
Epilepsy is a neurological disorder that affects approximately one percent of the world population. Anti-epileptic drugs are ineffective in 25~30% of cases. Electrical stimulation to control seizures may be an additive therapy. We applied noninvasive transcutaneous focal electrical stimulation (TFES) via concentric ring electrodes on the scalp of rats after inducing seizures with pentylenetetrazole. We found a significant increase in synchrony within the beta-gamma bands during seizures and that TFES significantly reduced the synchrony of the beta-gamma activity and increased synchrony in the delta band. 相似文献
97.
Event-related brain potentials when conjugating Russian verbs: The modularity of language procedures
S. G. Danko J. A. Boytsova M. L. Solovjeva T. V. Chernigovskaya S. V. Medvedev 《Human physiology》2014,40(3):237-243
Within the alternative concepts of “two-system” and “single-system” language models, brain mechanisms for the generation of regular and irregular forms of Russian verbs have been studied. The evoked EEG activity was recorded in 19 channels with random alternation of different speech-morphology operations. The infinitives of imperfective verbs that belong either to the productive group (conventionally, the default, or regular, class) or to the unproductive group (conventionally, the irregular class) were presented to healthy subjects. The subjects were to produce the first-person present-time forms of these verbs. The results of the analysis of the event-related potentials (ERPs) of 22 subjects are presented. Statistically valid ERP amplitude distinctions between the verb groups are found only in latencies of 600–850 ms in the central and parietal zones of the cortex. The peak values of the irregular-verb potentials are negative in this region in relation to the peak values of the regular-verb potentials. The findings are interpreted as the effect of various complexities of mental work with verbs of different groups and do not support the hypothesis of the universality of the two-system brain mechanism for processing regular and irregular language phenomena. 相似文献
98.
99.
B I Medvedev E P Severina V G Gogvadze E A Chukhlova 《General physiology and biophysics》1985,4(6):549-556
A correlation between the rate of H+/Ca2+ exchange and the content of free fatty acids in mitochondria has been found. Fatty acids were isolated from mitochondria with different activities of H+/Ca2+ exchange. It has been shown that these free fatty acids are able to induce Ca2+ release in exchange to protons after being added to freshly isolated mitochondria. 相似文献
100.