Marine microbiologists need to measure heterotrophic bacterial activity in oligotrophic ocean water, where both biomass and respiration rates are low. Which of the following approaches is BEST suited for this study?

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Use of Winkler titration to measure nitrate

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Plate counts using R2A media to estimate total cell counts

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Incorporation of ³H-thymidine into DNA to track cell production

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Measurement of oxygen depletion in large-volume incubations over 48 hours

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Marine microbiologists need to measure heterotrophic bacterial activity in oligo...

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