Dependence of product formation

The concentration of the product absorbed in the resin phase and the real rate constant were determined by the measurements of the time dependencies of product formation in the bulk phase and of the quantities adsorbed to the resin of both the product and substrate by assuming the following reaction scheme ... 

Dependence of Product Formation on Solvent Composition in the Irradiation of the Trityl Cation (Inert Atmosphere)... 

The above studies done on cell-free extracts and resting cells revealed a very low bioconversion yield (based on added penicillin G), i.e., about 0.6%. To examine the dependence of product formation and bioconversion yield on substrate concentration, different concentrations of penicillin G were tested [41]. As Fig. 6a depicts, the concentration of product formed was higher when higher concentrations of penicillin G were used, but the yield based on substrate added dramatically decreased (Fig. 6b). At 8 mg/ml of penicillin G, bioconversion was about 0.4% at 2 mg/ml (the standard concentration), the yield was 1.0% at 0.063 mg/ml, the yield was 9.0% and at 0.015 mg/ml (data not shown), the yield reached 16.5%. 

Solvent Dependence of Product Formation from Cyclobutanone Photolysis (313 nm Excitation)... 

Figure 26. CdS-photocatalyzed addition of 2,5-DHF to azobenzene dependence of product formation rates on solvent dielectric constant modified through application of pressure (dashed lines) or by changing the solvent from methanol over ethanol and 1-propanol to 1-butanol (solid lines).

By measuring the time dependence of product formation, the change in activity of the enzyme can be examined. The common method of data analysis is based on estimating the enzyme activity from the tangent to the curve at each time of reaction in a plot of product concentration versus time. However, this tedious and error-prone method of analysis can be avoided by recognizing that the time dependence of product formation will occur by an exponential followed by a linear phase ... 

In MeCN the products of photo -oxidation of Ph2C=CH2, cis- and trans-PhCH=CHPh, and Ph2C=CPh2 using 9,10-dicyanoanthracene and 9-cyano-anthracene as sensitizers include benzophenone, benzaldehyde, epoxides, and products of cu-trfln5-isomerization. " A correlation is established between the rate constants for electron-transfer processes and those determined from the acceptor concentration-dependence of product formation. These observations appear to implicate a sensitizer radical anion that subsequently reduces O2 to Oj-... 

The unusual dependence of product formation upon (aminoal-kyl)styrene structure (Scheme 7) can be correlated with the folded conformation preferred by the intramolecular exciplexes... 

Experimentalists measure integral reaction cross sections most directly in a bulb apparatus which does not detect the scattering angle dependence of product formation. A physical interpretation of the integral reaction cross section is the circular area centered at the target (i.e. one reactant collision partner) which, when crossed by the projectile (i.e. the other reactant collision partner), leads to a chemical reaction. 

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