نتایج جستجو برای: acidic environment
تعداد نتایج: 549975 فیلتر نتایج به سال:
The halophilic archaea (haloarchaea) live in saline environments which are found across the globe. In addition to salinity, these niches can be quite dynamic and experience extreme conditions such as low oxygen content, radiation (gamma and UV), pH and temperature. However, of all the naturally occurring stresses faced by the haloarchaea, only one, pH, has not been previously reported on. The...
Neutron diffraction analysis studies reported an isolated hydronium ion (H3 O+ ) in the interior of d-xylose isomerase (XI) and phycocyanobilin-ferredoxin oxidoreductase (PcyA). H3 O+ forms hydrogen bonds (H-bonds) with two histidine side-chains and a backbone carbonyl group in PcyA, whereas H3 O+ forms H-bonds with three acidic residues in XI. Using a quantum mechanical/molecular mechanical (Q...
Microvascular endothelial cells involved in angiogenesis are exposed to an acidic environment that is not conducive for growth and survival. These cells must exhibit a dynamic intracellular (cytosolic) pH (pHcyt) regulatory mechanism to cope with acidosis, in addition to the ubiquitous Na+/H+ exchanger and HCO3--based H+-transporting systems. We hypothesize that the presence of plasmalemmal vac...
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