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Summary: A study has been made of the use of triphenyltetrazolium bromide as an indicator of bacterial dehydrogenase activity. It has been shown that for practical purposes the determination may be carried out in the presence of air, thus obviating the use of oxygen‐freed Thunberg tubes. The method has been placed on a quantitative basis by determining, colorimetrically, the formazan produced on reduction. The limitations of the method are discussed.
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W. B. Hugo (1954) studied this question.
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