What are the major advantages of radioisotopic methods in the study of microbial ecology? What type of controls (discuss at least two) would you include in a radioisotopic experiment to show 14 CO 2...

What are the major advantages of radioisotopic methods in the study of microbial ecology? What type of controls (discuss at least two) would you include in a radioisotopic experiment to show
¹⁴CO₂
incorporation by phototrophic bacteria or to show
³⁵SO₄
^2-
reduction by sulfate-reducing bacteria?