A comprehensive and quantitative review of dark fermentative biohydrogen production.

Microb Cell Fact · 2012 · PMC3443015 · PMID 22925149

Europe PMC DOI

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a clear trendno p-value reported

Nonetheless, a clear trend towards better substrate conversion efficiency is revealed: Thermoanaerobacterales (Family III) > Clostridiaceae > Enterobacteriaceae .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.