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Incorporation of (3H)leucine and (3H)valine into protein of freshwater bacteria: uptake kinetics and intracellular isotope dilution

Article Abstract:

The uptake kinetics, isotope dilution and incorporation of leucine and valine into proteins of freshwater bacteria in two eutrophic lakes were studied. The results showed that the uptake kinetics and isotope dilution between freshwater and marine bacteria aredifferent. However, the basic biochemical pathways of amino acid incorporation were similar in both cases. In freshwater bacteria, the incorporation of leucine and valine are closely related. These results demonstrate that measurements of leucine and valine incorporation reflects realistic values of bacterial production in lake water.

Author: Jorgensen, Niels O.G.
Publisher: American Society for Microbiology
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992

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Effects of viruses on nutrient turnover and growth efficiency of noninfected marine bacterioplankton

Article Abstract:

The production of organic C, P and N compounds by viral lysis stimulates the growth of noninfected bacteria in marine environments suggesting that viral activity recycles nutrients in the microbial food web. The growth efficiency of noninfected bacteria decreases in the presence of viruses. The extracellular breakdown of polymeric organic nitrogen and phosphorous in cell lysates probably causes an increase in energy consumption and a decrease in growth ability. The addition of viruses to cultures with low P enhances the uptake of organic C and alkaline phosphatase activity.

Author: Jorgensen, Niels O.G., Kroer, Niels, Middelboe, Mathias
Publisher: American Society for Microbiology
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1996
Analysis, Growth, Bacterial growth, Viruses, Marine bacteria

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Incorporation of (3H)leucine and (3H)valine into protein of freshwater bacteria: field applications

Article Abstract:

The applicability of leucine and valine incorporation into proteinof freshwater bacteria as a measure of bacterial production was assessed. Experiments were conducted in two eutrophic Danish lakes, and leucine and valine incorporations were compared to results of thymidine incorporation and dissolved free amino acids (DFAA) incorporation. The results showed that measurements of leucine and valine incorporation correlated well with bacterialnumbers and DFAA results. Incorporation values and bacterial carbon production were also dependent on depth.

Author: Jorgensen, Niels O.G.
Publisher: American Society for Microbiology
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
Research, Lakes

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Subjects list: Measurement, Physiological aspects, Leucine, Branched chain amino acids, Microbial populations, Biological productivity
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