the ph dependence study reveals that the cys 206 sulphydryl group of bovine carbonicanhydrase in the native form is not exposed. during the reaction of 2,2'-dithiobispyridine (2-dtp) with the enzyme, there was no absorbance change recorded. in the presence ofsurfactants, the ph dependence profiles of the apparent second order rate constants, kapp, forthe reaction of 2-dtp with bovine carbonic a...

the ph dependence study reveals that the cys 206 sulphydryl group of bovine carbonicanhydrase in the native form is not exposed. during the reaction of 2,2'-dithiobispyridine (2-dtp) with the enzyme, there was no absorbance change recorded. in the presence ofsurfactants, the ph dependence profiles of the apparent second order rate constants, kapp, forthe reaction of 2-dtp with bovine carbo...

The rate constant for the C6H5 + C6H5 recombination reaction has been determined in the temperature range 300-500 K using a laser photolysis/mass spectrometric technique. The result is represented by k1 ) (1.39 ( 0.11) × 1013e-(56(36)/T cm3/(mol s). In addition, the rate constant for the C6H5 + C6H5NO association reaction was found to be k4 ) (4.90 ( 0.19) × 1012e(34(16)/T cm3/(mol s) by the ma...

degradation of o,o-dimethyl -o-4-nitrophenylphosphorothioate (methylparathion) by ozonation in aqueous solution was studied in a batch reactor under constant ozone dosage and variable ph conditions. the effectiveness of the process was estimated based on the degree of cod (chemical oxygen demand) reduction and conversion of methylparathion. it was observed that ozonation is more effective at a...

The kinetics of the reduction by dithionite of several biochemically interesting substances has been investigated under anaerobic conditions by stopped flow spectrophotometry at pH 8.0 and 25”. Solutions of sodium dithionite were prepared and standardized by titration against lumiflavin 3-acetate in the absence of oxygen. Under pseudo-first order conditions (dithionite in excess) the reactions ...

We study a (N +1)−hypercyclical reaction-diffusion system with nonlinear reaction rate n. It is shown that there exists a critical threshold N0 such that for N ≤ N0 the system is stable while for N > N0 it becomes unstable. It is also shown that for large reaction rate n, N0 remains a constant: in fact for n ≥ n0 ∼ 3.35, N0 = 5 and for n < n0 ∼ 3.35, N0 = 4. Some more general reaction-diffusion...