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Research Article

Estimates of bacterial growth from changes in uptake rates and biomass.

D Kirchman, H Ducklow, R Mitchell
D Kirchman
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H Ducklow
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R Mitchell
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ABSTRACT

Rates of nucleic acid synthesis have been used to examine microbiol growth in natural waters. These rates are calculated from the incorporation of [3H]adenine and [3H]thymidine for RNA and DNA syntheses, respectively. Several additional biochemical parameters must be measured or taken from the literature to estimate growth rates from the incorporation of the tritiated compounds. We propose a simple method of estimating a conversion factor which obviates measuring these biochemical parameters. The change in bacterial abundance and incorporation rates of [3H]thymidine was measured in samples from three environments. The incorporation of exogenous [3H]thymidine was closely coupled with growth and cell division as estimated from the increase in bacterial biomass. Analysis of the changes in incorporation rates and initial bacterial abundance yielded a conversion factor for calculating bacterial production rates from incorporation rates. Furthermore, the growth rate of only those bacteria incorporating the compound can be estimated. The data analysis and experimental design can be used to estimate the proportion of nondividing cells and to examine changes in cell volumes.

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Estimates of bacterial growth from changes in uptake rates and biomass.
D Kirchman, H Ducklow, R Mitchell
Applied and Environmental Microbiology Dec 1982, 44 (6) 1296-1307; DOI:

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Estimates of bacterial growth from changes in uptake rates and biomass.
D Kirchman, H Ducklow, R Mitchell
Applied and Environmental Microbiology Dec 1982, 44 (6) 1296-1307; DOI:
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