Phototrophic organisms in SIP experiments are often observed releasing ¹⁴CO₂ as a way of measuring photosynthetic activity.

Question

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Phototrophic organisms in SIP (Stable Isotope Probing) experiments typically incorporate ¹⁴CO₂ (or more commonly, stable isotopes like ¹³CO₂) into their biomass during photosynthesis, rather than releasing it. This incorporation is used to measure photosynthetic activity.

Phototrophic Organisms in SIP Experiments Are Often Observed Releasing ¹⁴CO₂