During photo-fermentative H(2) production, the effects of carbon and nitrogen sources on nitrogenase and hydrogenase activity, poly-β-hydroxybutyrate accumulation were investigated. In succinate/ammonium sulfate medium, H(2) was not detected for the first 6h because high ammonium concentration considerably reduced the nitrogenase activity to below 5 nmol/g-dcw/h. After 24h, 99% of the ammonium ...

A simple and rapid method is described for determining the free acetate concentration in liver and serum. After extraction, the acetate is converted to its benzyl ester by thermal degradation of its benzyldimethylphenylammonium salt in the vaporizer of a gas chromatography. Good quantitation is achieved in the range of 0.033-2.5 mumoles of acetate per gram of liver or per milliliter of serum.

The title compound, NH(4) (+)·C(8)H(7)Cl(2)O(6) (-)·0.5H(2)O, was prepared by the reaction of 2-(2,4-dichloro-phen-oxy)-acetic acid and ammonia in water at 367 K. The mol-ecular structure and packing are stabilized by N-H⋯O and O-H⋯O inter-molecular hydrogen-bond inter-actions.

An investigation was conducted in the laboratory and glasshouse to assess the sulphur (S) supplyingability of the important soil forms of the sugar industry. The amount of S in the soil as measured by a 0,5N ammonium acetate extraction procedure, was compared with the availability ofS during continuouscroppingof sorghumin pots. The number ofcropsrequired to exhaust the reserves of S was fairly ...

Glutamine has been shown to influence endothelial-dependent relaxation and nitric oxide production in vitro, possibly by limiting arginine availability, but its effects in vivo have not been well studied. Hyperammonemia is a pathophysiological condition in which glutamine is elevated and contributes to depressed CO(2) reactivity of cerebral arterioles. We tested the hypothesis that acute hypera...

A simple, rapid and selective liquid chromatography-atmospheric pressure chemical ionization-mass spectrometry (LC-APCI-MS) assay method has been developed and fully validated for the simultaneous quantification of cefadroxil (CF) and clavulanic acid (CA) in human plasma. Analytes and internal standard (IS) were extracted from human plasma by solid-phase extraction (SPE) technique using Sam pre...

A simple, rapid, specific and sensitive liquid chromatography tandem mass spectrometric method has been developed and validated for the simultaneous determination of Amoxicillin and Clavulanic acid from 250μL of human plasma by Solid Phase Extraction. Hydrochlorothiazide was used as an internal standard. Quantified by the transition, 364.060→223.160, 198.061→136.000 for Amoxicillin and Clavulan...

A standard diet was supplemented with ammonium acetate (20%, w/w). The effect on liver protein degradation of oral administration of the ammonium diet to rats for 6 weeks has been studied. It is shown that lysosomal proteolysis is markedly decreased (by 62%) while non-lysosomal proteolysis is inhibited by 11%. This is the first report showing that ammonium ingestion inhibits liver proteolysis.