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1.
Reaction patterns of 90 cortical neurons to acetylcholine approximated by two parabolas have been divided on simple and complex. The participation of different types of cholinoreceptors in complex reactions to transmitter is proposed. 相似文献
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The effect of lincocin (a plastid protein synthesis inhibitor) treatment on the greening process of bean (Phaseolus vulgaris L.) leaves have been studied. In comparison with control leaves treated ones had a decreased rate of chloroplast development. They had a marked chlorophyll deficiency and a decreased chlorophyll a/b ratio. Some long and short wavelength forms of chlorophyll a were lacking as evidenced from the absorption spectra at 25°C and the fluorescence spectra at 77°K. The –14CO2 fixation was inhibited by 80–90% in treated leaves. The fluorescence induced by the measuring light was greater in the treated leaves than in the control ones, and the kinetics of the decline of the relative fluorescence intensity were also different. Electron microscopic studies showed macrogranum-like structures and incomplete membrane vesicles in the treated plastids. After longer treatment a destruction of membranes was observed. The results indicate some structural and functional membrane deficiencies and instability of the membranes. 相似文献
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DIDIER FOURGON IGOR EECKHAUT DEVARAJEN VAÏTILINGON MICHEL JANGOUX 《Invertebrate reproduction & development.》2013,57(3):155-165
Summary The larval development of the ophiocomid ophiuroid Ophiomastix venosais described using SEM. The gastrula transforms into a uniformly ciliated early larva which progressively changes into a lecithotrophic late premetamorphic larva with a continuous bilateral ciliated band. This stage is short-lived and equivalent to a highly reduced ophiopluteus. Comparisons between O. venosa and other ophiuroid species whose development has been investigated suggest that, whatever the developmental mode (lecithotrophic or planktotrophic), a pluteus stage always occurs in ophiuroids with planktonic development. Two metamorphic stages were identified, the late metamorphic larva differing from the early one by the closure of the larval mouth. The appearance of the permanent mouth marks the end of the metamorphosis. The postlarva still possesses remnants of larval features. The transformation of the reduced ophiopluteus into a barrel-shaped metamorphic larva with transverse ciliated bands, a vitellaria larva, is followed. The possible occurrence of a unique type of metamorphic larva in non-brooding ophiuroids is discussed. Verification of this, however, needs further SEM investigations on metamorphic larva from species having “regular” planktotrophic development. 相似文献
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Xylitol-phosphate dehydrogenase (XPDH) genes from several Gram-positive bacteria were isolated and expressed in Bacillus subtilis. The substrate specificities of the recombinant XPDH enzymes were compared and it was found that the XPDH enzymes of Lactobacillus rhamnosus and Clostridium difficile had the highest selectivity towards D-xylulose 5-phosphate. Expression of these two XPDH enzymes in D-ribulose and D-xylulose producing B. subtilis strain resulted in strains of B. subtilis capable of converting D-glucose into xylitol at around 23% yield. 相似文献
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Grebeniuk AN Bykov VN Miasnikov VA Zatsepin VV Aksenova NV Drachev IS Suprunova EB 《Radiatsionnaia biologiia, radioecologiia / Rossi?skaia akademiia nauk》2011,51(4):464-470
The purpose of the study is evaluation of radioprotective effectiveness of indometofen at its prophylactic administration in conditions of acute irradiation. Evaluation of radioprotective efficiency was performed by studying the 30-day survival rate, life expectancy, structure of deathly irradiated mice, and bone marrow hemopoiesis using methods of endogenous and exogenous colony formation. The prophylactic application of indometofen at doses 30 mg/kg for 5 days before irradiation has been observed to protect mice against radiation death induced by gamma or X-ray exposures at doses LD(50-70/30), increasing their survival rate by 16-44%, and reduce severity of post radiation disorders of bone marrow hemopoiesis. 相似文献
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Three groups of sensorimotor cortical cholinoceptive neurons have been established in albino rats according to the dynamics of reactivity to repeated action of acetylcholine. There are neurons with decreased, increased or unchanged response to transmitter microintophoretic application. Dependence of the dynamics of background and evoked activity on the duration of excitatory reaction component induced by transmitter has been discovered. It was concluded that the duration of the given component is a significant and informative functional parameter of cortical neurons. 相似文献
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G G Khludova A A Miasnikov B I Kotliar 《Nauchnye doklady vysshe? shkoly. Biologicheskie nauki》1984,(12):40-44
An ultrastructure comparison of presynaptic and postsynaptic components of axodendritic synapses of the fifth layer of rats neocortex sensomotor region after microionophoresis of acetylcholine and physiological solution has been carried out. The absence of true differences is considered as an adequacy indicator of application mediator regime. 相似文献
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