نتایج جستجو برای: o2 depletion
تعداد نتایج: 87470 فیلتر نتایج به سال:
Abscisic acid (ABA) prevents opening of closed stomata and causes open stomata to close. A dual-source model is proposed linking ABA to diurnal stomatal movements. Darkness would favour guard cell biosynthesis of endogenous ABA and disfavour ABA catabolism. At first light, xanthophyll cycling, isomerization of ABA precursors, and activation of a cytochrome P450 mono-oxygenase (CytP450) would de...
Trypanosoma cruzi undergo PCD (programmed cell death) under appropriate stimuli, the mechanisms of which remain to be established. In the present study, we show that stimulation of PCD in T. cruzi epimastigotes by FHS (fresh human serum) results in rapid (<1 h) externalization of phosphatidylserine and depletion of the low molecular mass thiols dihydrotrypanothione and glutathione. Concomitantl...
The stability of iron ascorbate solutions was investigated, under both anaerobic and aerobic conditions, with the Fe2+ and Fe3+ indicators, respectively ferrozine and mimosine, at different pH values. The species present under the differing conditions were investigated by electron paramagnetic resonance (EPR) and Mössbauer spectroscopy and by gel-filtration chromatography. At physiological pH (...
We herein investigated the regulatory mechanism in the circulation responsible for rat gingival reactive hyperemia (RH) associated with ischemia/reperfusion (I/R). RH was analyzed using a laser Doppler flowmeter. RH and I/R were elicited by gingival compression and release with a laser Doppler probe. RH increased in a time-dependent manner when the duration of compression was between 30 s and 2...
Rate coefficients for electron-impact dissociation of O3 + to the O+ and O2 fragments are calculated new, recommended cross section data set various collisional conditions. Two sets data, measured recently by different experimental groups, used. These sections differ significantly with each other, but renormalized optimized coherent base. ozone cation fragmentation determined using Maxwellian n...
found to be independent of O2 concentration over a wide range (Wilson et al., 1979, 1988). Recently, however, Schumacker et al. (1993) and Chandel et al. (1997) reported a marked O2dependence of respiration in rat hepatocytes when hypoxia was maintained over several hours, an experimental approach not applied in previous studies. Furthermore, O2-dependence even under acute hypoxia has been desc...
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