Heterotrophic activity of deep-sea sediment bacteria.

Applied Microbiology
J R Schwarz, R R Colwell

Abstract

Sediment samples, containing mixed microbial populations that were decompressed during retrieval from 7,750 and 8,130 m in the Puerto Rican Trench, were recompressed and incubated at the approximate in situ temperature (3 C) and pressure (775 or 815 atm) in the presence of 14C-labeled amino acids. Heterotrophic activity (total uptake, CO2 respiration, and cellular assimilation) and cellular-associated "pool" concentrations were measured. Compared with atmospheric controls held at 3 C, the total uptake at elevated pressure at 3 C was reduced, on an average, 55 times, CO2 respiration was reduced 45 times, and cellular assimilation was reduced 69 times. Rate of total uptake at elevated pressure was found to range from 4.0 X 10(-11) mug/cell per h for leucine to 2.61 X 10(-10) mug/cell per h for an amino acid mixture. Also, the percentage of total uptake at elevated pressures, respired as CO2, increased at the expense of cellular assimilation (ca. 22% increase). Two cellular-associated amino acid pools were detected, a large, loosely bound, outer pool and a small, tightly bound internal pool. The loosely bound outer pool was removed by a change in the pH of the incubation medium. Even though heterotrophic uptake and the outer, cell...Continue Reading

References

Feb 1, 1975·Journal of Bacteriology·D H PopeJ V Landau
May 1, 1975·Canadian Journal of Microbiology·J R SchwarzR R Colwell
Feb 1, 1972·Journal of Bacteriology·J R Schwarz, J V Landau
Dec 1, 1972·Journal of Bacteriology·J R Schwarz, J V Landau
Apr 1, 1971·Applied Microbiology·M J HarrisonR Y Morita
Jan 1, 1969·Journal of Bacteriology·W W Kay, A F Gronlund
Dec 1, 1970·Journal of General Microbiology·D W TempestC M Brown
Feb 19, 1971·Science·H W JannaschA Farmanfarmaian
Jan 1, 1968·Journal of Bacteriology·M M Quigley, R R Colwell
Oct 1, 1966·Canadian Journal of Microbiology·R D HamiltonJ D Strickland
Apr 1, 1957·Journal of Bacteriology·C E ZOBELL, R Y MORITA
Sep 1, 1962·Bacteriological Reviews·R J BRITTEN, F T McCLURE
Dec 1, 1950·Journal of Bacteriology·C E ZOBELL, C H OPPENHEIMER
May 11, 1973·Science·H W Jannasch, C O Wirsen

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Citations

Nov 1, 1982·Applied and Environmental Microbiology·J W Deming, R R Colwell
Sep 1, 1981·Applied and Environmental Microbiology·G G Geesey, R Y Morita
Sep 1, 1976·Applied and Environmental Microbiology·H J JannaschC D Taylor
Jun 1, 1982·Applied and Environmental Microbiology·A A Yayanos, A S Dietz

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