Temporal patterns of nitrogenase gene (nifH) expression in the oligotrophic North Pacific Ocean

Article Abstract:

The presence and expression of specific planktonic nitrogenase genes (nifH) in upper ocean at Station ALOHA in the oligotrophic North Pacific Ocean is examined. The results indicate that in the nitrogen-impoverished waters of the subtropical North Pacific Ocean several different bacterial groups help regulate biological N2 fixation in the upper ocean and that the specialized activities of different diazotroph groups may permit fixed nitrogen inputs at various times of day and night.

Pacific Ocean, Genetic aspects, Nitrogenase, Plankton, North Pacific Ocean

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Spatial and temporal distribution of two diazotrophic bacteria in the Chesapeake Bay

Article Abstract:

Spatial and temporal distribution of two diazotrophs in Chesapeake Bay was investigated using a quantitative PCR approach, for initiating autecological studies on uncultivated natural populations of diazotrophic bacteria and to detect the presence of specific bacteria encoding nifH throughout Chesapeake Bay. The individual nitrogen-fixing bacteria in the Chesapeake Bay show a distinct nonrandom spatial and seasonal distribution.

Legal issues & crime, Usage, Company legal issue, Investigations, Bacteria, Chesapeake Bay, Polymerase chain reaction, Nitrogen-fixing microorganisms, Properties

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Fingerprinting diazotroph communities in the Chesapeake Bay by using a DNA macroarray

Article Abstract:

DNA arrays have been developed and applied to study the dynamics of microbial communities and genes encoding enzymes involved in specific biogeochemical processes. A study using a recently developed DNA macroarray approach to compare the distribution of nifH gene phylotypes in a transect of surface water samples from the Chesapeake Bay, is presented.

Biological Product (except Diagnostic) Manufacturing, Drugs, Deoxyribonucleic Acid, DNA, Phylogeny, Genetic research, Diazotype, Diazo copying

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