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• W2121566166 abstract "Sediment whole-round cores from between 0.15 and 425 meters below seafloor (mbsf) were obtained, using special techniquesto prevent external contamination and maintain anaerobic conditions, to determine the potential for bacterial growth. Sampleswere taken from the centers of whole-round cores and handled under strict aseptic conditions to prevent contamination and thenincubated anaerobically with 1 g/dm3 yeast extract at 15° C. Bacteria were present in all samples prior to incubation and theirnumbers decreased logarithmically with depth from 9.3 × 108/gat0.15 mbsf to 1.7 × 107/gat425 mbsf. Direct evidence of in-situgrowth, as shown by dividing cells, was found in the upper sediments but not below 10 mbsf.Growth was stimulated in all samples except at 9.75 mbsf. Numbers of bacteria increased with time, showing typical growthcurves. The frequency of dividing and divided cells (FDDC) increased, and FDDC values were maximal in the midlogarithmicgrowth phase, as were bacterial productivity estimates calculated from 3H-thymidine incorporation. The absence of growth at9.75 mbsf may indicate that these bacteria were changing to dormant forms and were under considerable metabolic stress, resultingin substrate accelerated death when a carbon source was added.Bacteria in deep sediments, below 9.75 mbsf, appeared to be largely dormant but were able to grow quickly (within 12 to 96hr) when incubated with a growth substrate. Extrapolation of the logarithmic growth phase to zero time gave estimates of bacterialviabilities between 0.02% and 35%. These were probably unrealistically high, and considerably higher than those found by otherworkers using selective media. There was no evidence for contamination of these deep sediment layers by the more active surfacesediments during coring. The bacterial distributions and their subsequent growth were consistent with a more comprehensivestudy of bacterial populations and activity at the same site by Cragg and others. Together, these data demonstrate that bacterialpopulations can remain viable for very long periods of time, presumably by slowly metabolizing increasingly recalcitrant organiccompounds, but can rapidly grow when a suitable growth substrate is supplied." @default.
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• W2121566166 date "1992-09-01" @default.
• W2121566166 modified "2023-10-14" @default.
• W2121566166 title "The Potential for Bacteria Growth in Deep Sediment Layers of the Japan Sea, Hole 798B-Leg 128" @default.
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• W2121566166 doi "https://doi.org/10.2973/odp.proc.sr.127128-1.183.1992" @default.
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