Topic
Vanadate
About: Vanadate is a research topic. Over the lifetime, 4497 publications have been published within this topic receiving 120109 citations. The topic is also known as: vanadate.
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TL;DR: It is concluded that proton excretion is mediated by an active proton pump on the apical membrane of the gill epithelium similar to that reported for the frog skin.
Abstract: Ion transport inhibitors, amiloride, SITS, vanadate and acetazolamide, wereadded to the water to determine the effect of ion transfer mechanisms on the acidification of water passing over the gills. In neutral water, proton excretion causes a marked reduction in gill water pH. If water pH is 2.5 units lower than blood pH, however, then this proton excretion is inhibited and all water pH changes can be accounted for by CO 2 hydration and ammonia protonation. Proton excretion across the gills is insensitive to 0.1mmoll −1 amiloride and SITS but sensitive to vanadate, acetazolamide and water pH; thus, we conclude that proton excretion is mediated by an active proton pump on the apical membrane of the gill epithelium similar to that reported for the frog skin. Higher concentrations of amiloride (0.5 and 1mmoll −1 ) reduced both ammonia and acid excretion, presumably because of inhibition of Na + /K + -ATPase on the basolateral border ofthe gill epithelium.
191 citations
TL;DR: Two studies are consistent with the conclusion that vanadate inhibits tyrosine phosphatases by acting as a transition state analog, and the structure of theVanadate complex may be expected to closely resemble the transition state for reactions catalyzed by protein tyrosining phosphatase enzymes.
Abstract: The early transition metal oxoanions vanadate, molybdate, and tungstate are widely used inhibitors for phosphatase enzymes. These oxoanions could inhibit such enzymes by simply mimicking the tetrah...
191 citations
TL;DR: The structure and function of the Na,K-pump proteins and the control of pump functions in kidney tubules are discussed and the nature of E 1 E 2 transitions in the α-subunit and their relation to cation binding, occlusion, and translocation in the reaction cycle will be examined.
190 citations
TL;DR: The results strongly suggest that the plasma membrane Ca2+ pump is regulated by cGMP but not by cAMP in intact vascular smooth muscle cells.
189 citations
TL;DR: In this article, the authors studied the energy transfer process in vanadate-doped nanocrystalline YVO4 and YP0.95V0.05O4 and showed that vanadates can be quenched at surface sites.
Abstract: The luminescence of pure and europium-doped nanocrystalline YVO4 and YP0.95V0.05O4 and the energy transfer processes in such nanoparticles have been studied by temperature dependent luminescence spectroscopy and luminescence lifetime measurements. The results indicate thermally activated energy transfer between adjacent vanadate groups in YVO4 at temperatures above 100 K, but energy transfer to europium seems to take place from direct vanadate neighbors only. In contrast to the luminescence decay of europium, the kinetic of the vanadate luminescence strongly depends on the choice of surface capping and solvent, indicating partial quenching of the vanadate emission at surface sites. The strong competition with energy transfer to surface sites seems to be reason for the absence of energy transfer to europium from distant vanadate groups. The latter explains the low room-temperature quantum yield of 15% of YVO4:Eu colloids.
185 citations