Plants are naturally exposed to frequent changes in environmental conditions such as salt stress affecting their growth and development, and consequently a considerable reduction in total productivity. Monodehydroascorbate reductase (MDHAR), a key enzyme in ascorbate-glutathione cycle, serves as an important antioxidative enzyme in scavenging of reactive oxygen spices (ROS). In this study, ...

The effect of epinephrine on phosphatidate phosphohydrolase (PAP) activity of isolated human hepatocytes was studied. Epineprine inhibited the enzyme activity progressively at concentrations above 0.1 µM, reaching a maximum inhibition of 64.5% at 100 µM concentration. Inclusion of alprenolol, a β-receptor blocker, in the incubation mixture abolished the inhibitory effect of epinephrine on P...

In this work, the production of fungal laccase was optimized from local isolate of Pleurotus ostreatus using solid state fermentation. Factorial design was used to study the effect of several nutrients on enzyme production. Purification and characterization of the enzyme and the effect of temperature, pH and gamma radiation on fungal growth and enzyme production was investigated. Optimization o...

(Na+,K+)-ATPase was studied by electron microscopy and image processing of negatively stained and freeze-dried and shadowed crystalline sheets induced by a number of inorganic salts. Extensive experiments have identified new conditions for optimum crystal formation. Two crystal forms have been observed, one with a monomer and the other with a dimer, in the unit cell. Both show the same structur...

In this work, the enzymatic synthesis of pentyl acetate obtained from acetic acid and pentan-1-ol using commercial immobilized lipase Lipozyme®435 was studied. Specifically, effects several variables process on kinetics were shown, such as initial concentration acid, alcohol/acid molar ratio, possible reuse enzyme, while other variables, temperature, agitation, enzyme/acid ratio held constant. ...