The effects of digitonin and tocopherol on bovine heart reduced diphosphopyridine nucleotideand succinate-cytochrome c reductases and cytochrome c oxidase have been studied with the following results. 1. Low concentrations of digitonin stimulate succinateand DPNH-cytochrome c reductase and cytochrome c oxidase. Higher concentrations of digitonin completely inhibit cytochrome c reductases, while...

A mutant of Escherichia coli unable to metabolize succinate has been used to study the nature of succinate transport in whole cells. It is demonstrated that cells accumulate succinate against a concentration gradient. The uptake of succinate is competitively inhibited by fumarate and malate. The Michaelis constants for the dicarboxylic acids are all in the range of 15 to 30 pM. The accumulation...

Sorbitol was employed as the grafting agent to modify nano-silica by hyperbranched reaction. The obtained carrier further used prepare immobilized 4-dimethylaminopyridine (DMAP), which successfully applied produce vitamin E succinate. Two crucial steps were systematically investigated during preparation of loaded DMAP: epoxy-alcohol addition and N-alkylation reactions. For reaction, maximum hyd...

Objective Vitamin E is a major lipid-soluble antioxidant. It has been demonstrated that vitamin E supplementation has a beneficial effect against coronary heart disease (CHD). This study to investigate the effects of coronary risk factors on serum vitamin E status in patients with dyslipidaemia. Materials and Methods This tertiary care hospital; case - control study was comprised 237 dyslipidae...

Succinate fermentation was investigated in Escherichia coli strains overexpressing Actinobacillus succinogenes phosphoenolpyruvate carboxykinase (PEPCK). In E. coli K-12, PEPCK overexpression had no effect on succinate fermentation. In contrast, in the phosphoenolpyruvate carboxylase mutant E. coli strain K-12 ppc::kan, PEPCK overexpression increased succinate production 6.5-fold.

BACKGROUND Succinate is an important C4 building block chemical, and its production via fermentative processes in bacteria has many practical applications in the biotechnology field. One of the major goals of optimizing the bacterium-based succinate production process is to lower the culture pH from the current neutral conditions, as this would reduce total production costs. In our previous stu...