The reactions of hydrazines with trans-Dichlorobis(ethylenediamine)cobalt(III)chloride, and the isolation and kinetic studies of a Chlorobis(ethylenediamine)methylhydrazinecobalt(III) isomer

The reactions of hydrazine, methylhydrazine, and 1,1-dimethylhydrazine with trans-dichlorobis(ethylenediamine)cobalt(III) chloride in concentrated and dilute solutions are studied. In concentrated solution, there is a reduction by hydrazine to form the insoluble polymeric [CoII(N2H4)2Cl2]n, a substitution by methylhydrazine to form chlorobis(ethylenediamine)methylhydrazinecobalt(III) chloride, and a disproportionation with 1,1-dimethylhydrazine to form tris(ethylenediamine)cobalt(III) chloride. In dilute solution, the reaction observed is a hydroxide substitution by hydrolysis of 1,1- dimethylhydrazine, a reduction to soluble cobalt(II)-ethylenediamine species with hydrazine, and a mixture of both processes for methylhydrazine. The chlorobis(ethylenediamine)methylhydrazinecobalt-(III) chloride obtained is a new complex, and is assigned a cis configuration on the basis of spectroscopic observations. The kinetics of its intramolecular electron-transfer, as well as its acid and base hydrolyses are also studied.

Regulatory effect of pyruvate on the glucose metabolism of Clostridium thermosaccharolyticum

Whole cells and cell-free extracts of Clostridium thermosaccharolyticum 3814 grown in media containing 0.5% glucose or 0.6% pyruvate were evaluated for their metabolic activities toward these compounds. Glucose-grown cells rapidly fermented glucose with the production of gases (CO(2) and H(2)), acids, and alcohol, but they did not ferment pyruvate well. Pyruvate-grown cells, on the other hand, readily fermented pyruvate, while fermenting glucose at a rate of one-half that of pyruvate. An analysis of the enzyme levels in the two cell culture conditions revealed that pyruvate-grown cells had lower levels of most of the glycolytic enzymes and increased levels of the hexose monophosphate pathway enzymes. Incorporation studies with the use of labeled glucose demonstrated that cells do have a control mechanism(s) whereby they can discriminate between a carbon (glucose) and an energy (pyruvate) source, selectively utilizing glucose in the synthetic pathway while obtaining energy from the phosphoroclastic degradation of pyruvate.