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. 2005 Dec;71(12):7650–7660. doi: 10.1128/AEM.71.12.7650-7660.2005

TABLE 1.

Comparison of heterotrophic bacterial biomass production, respiration, and bacterial growth efficiency in the control and enriched microcosms integrated during the last 24 h of the microcosm experimentc

Characteristic Control microcosms
Enriched microcosms
C1 C2 NUT1 NUT2
BBP (μM C) 0.24 0.30 3.05 3.04
Respiration (μM O2) 2.46 2.80 7.90 8.73
BGEa 0.09 0.10 0.28 0.26
DMSP contribution to C demand (%) 6 5 5 4
[35S]DMSP sulfur assimilation efficiency into TCA insolubles (%) 29 29 13 12
DMSP contribution to S demand (%)b 860 690 102 95
a

Assuming the BGE = BBP/(BBP + respiration), a respiratory quotient of 1, and that nonbacterial respiration was negligible. If nonbacterial respiration was significant, actual bacterial growth efficiencies would be higher than calculated. BBP, bacterial biomass production; BGE, bacterial growth efficiency.

b

Assuming a C:S ratio of 240 (2).

c

Also shown is the proportion of the bacterial C and S demands that could be derived from the measured DMSP consumption rates.