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Voltammetry has been widely used in attempts to measure catecholamine release in vivo. The voltammogram recorded in the rat striatum using carbon paste electrodes and linear sweep voltammetry with semidifferentiation consists of a number of separate peaks; changes in the height of the first of these peaks have been attributed to changes in catecholamine(More)
The experimental results on the interconversion of dihydroxyacetone phosphate and D-glyceraldehyde 3-phosphate catalyzed by triosephosphate isomerase that are presented in the previous five papers are here collected and analyzed according to the theory presented in the first paper (Albery, W.J., Knowles, J.R. (1976), Biochemistry 15, the first of eight(More)
The effect of isotopic substitution of the specifically labilized hydrogen in the substrates of triosephosphate isomerase on the steady-state rates of the enzyme-catalyzed reaction has been examined. The k cat value for the enzyme-catalyzed transformation of [1(R)-2H] dihydroxyacetone phosphate is 2.9 times smaller than that for the 1(R)-1H compound.(More)
Linear sweep voltammograms were recorded in the striata of rats with a unilateral cortical lesion. The height of the ascorbate peak was 55% smaller on the lesioned side compared with the intact side, the homovanillic acid peak showed no significant change. The nocturnal increase in the release of striatal ascorbate was reduced by 80% on the lesioned side(More)
The kinetic and thermodynamic features of reactions catalyzed by present-day enzymes appear to be the consequence of the evolution of these proteins toward maximal catalytic effectiveness. These features are identified and analyzed (in detail for one substrate-one product enzymes) by using ideas that link the energetics of the reaction catalyzed by an(More)
Three different types of amperometric enzyme electrode are described. The first type uses a conducting organic-salt electrode to oxidize NADH. Results for sensors for ethanol and for bile acids are presented. In the second type of sensor, flavoenzymes are directly oxidized on the surface of the conducting organic-salt electrode. Results for five different(More)
Circadian variations in the extracellular concentration of ascorbate and homovanillic acid in the striatum of unrestrained rats were measured simultaneously at 12 min intervals over periods of up to 48 h using carbon paste electrodes and microprocessor-controlled linear sweep voltammetry. Both compounds show a similar time course over a 24 h period,(More)
The interconversion of L- and D-proline catalyzed by proline racemase has been studied. The entire time course of the approach to equilibrium has been followed. After a short time the product concentration is significant, and the reaction runs under reversible conditions. As the total substrate concentration is increased, the system moves from the(More)