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Biological sciences

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Partitioning effects during terminal carbon and electron flow in sediments of a low-salinity meltwater pond near Bratina Island, McMurdo Ice Shelf, Antarctica

Article Abstract:

Partitioning effects in terminal carbon and electron flow in sediments of a low-salinity meltwater pond have been studied near Bratina Island, McMurdo Ice Shelf, Antarctica. Anaerobic sediments below cyanobacterial mats in the pond have been studied. Sulfate reduction and methane production were found to be important terminal anaerobic processes. Results show that carbon flow from acetate is coupled primarily to sulfate reduction and that methane is mostly generated from hydrogen and carbon dioxide with chloride in the modulating role. Maximal rates of methanogenesis are at 20 degrees C.

Antarctica, New Zealand, Statistical Data Included, Research, Environmental aspects, Cyanobacteria, Ice caps, Methanobacteriaceae, Methanogens, Molecular microbiology, Pond ecology, Resource partitioning (Ecology), McMurdo Sound

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Regulatory influences on the production of gamma-aminobutyric acid by a marine psedomonad

Article Abstract:

Pseudonomas sp. strain G-17, which is capable of producing gamma-aminobutyric acid (GABA) was isolated from seawater through an enrichment that used glutamate as the sole carbon and nitrogen source. Results showed that the GABA production was cell associated and only a small quantity was released in the surrounding medium. However, the amount of GABA release by the strain was found to increase with the decreasing level of of Na+ ions suggestinh a Na+ -dependent transport system in GABA secretion.

GABA

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New enzymatic method of chiral amino acid synthesis by dynamic kinetic resolution of amino acid amides: Use of stereoselective amino acid amidases in the presence of alpha-amino-caprolactam racemase

Article Abstract:

D- and L-amino acids are produced from L and D-amino acid amides by D-aminopeptidase from ochrobactrum anthropi C1-38 and L-amino acid amidase from Pseudomonas azotoformans IAM 1603 respectively. The conversion of various d-amino acid amides to the corresponding L-amino acids also examined by using LaaA.

Genetic aspects, Amino acids, Amino acid synthesis

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