Fine structural analyses of nerve terminals in both the central and in the peripheral nervous systems have demonstrated the presence of synaptic vesicles, which were postulated to be the storage sites of neurotransmitters . Several different types of synaptic vesicles have been described (see ref . 6) . Electron-lucent vesices, 400-500 A in diameter, constitute the most commonly occurring type ...

In recent years, the use of ion-selective membranes in sensing and assessment environmental contaminants has become a critical goal. Using sodium tetraphenylborate (TPB) phosphotungstic acid (PTA) as ion-pairing agents, two sensitive selective sensors were manufactured to evaluate electrochemical response moxifloxacin hydrochloride (MOX). The optimal behavior was attained by fine-tuning all ass...

Atomic dispersion of Rh on phosphotungstic acid (PTA) salts was achieved by a self-assembled precipitation method using alkali metal ions as coprecipitation reagents. During styrene hydroformylation, the supported single-atom catalyst (Rh1/M-PTA, M refers to an ion) demonstrated optimum turnover frequency (TOF) 1076 h-1. With increasing ionic radius, pore size catalysts increased in ...

Six quaternary phosphonium salts (QPSs) in combination with phosphotungstic heteropolyacid, H3PW12O40, were tested the epoxidation of rapeseed oil fatty acid methyl esters a hydrogen peroxide aqueous solution. The QPSs consisted trihexyl(tetradecyl)phosphonium [P6], tributyl-tetradecylphosphonium [P4] or tetraoctylphosphonium [P8] cation and different anions—chloride (Cl−), bromide (Br−), tetra...

Behre and Benedict (2) developed a procedure for the determination of ergothioneine, based upon the separation of this substance from uric acid, followed by estimation of the ergothioneine by its reaction with a phosphotungstic acid reagent. In discussing the inadequacies of this method and its modifications, Behre in 1932 (3) stated that “no great, reliance can be placed on the figures so far ...