Enhancing anaerobic digestion of poultry blood using activated carbon.

J Adv Res · 2017 · PMC5403941 · PMID 28462003

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a decreasing trendno p-value reported

However, a decreasing trend in the content of acetic acid was observed for both reactors when the experiment was near the end, with this trend starting at an earlier stage for the RG system (on day 45).

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an increasing trendno p-value reported

In the case of C3–C5 acid forms, these acids demonstrated an increasing trend that was more pronounced in the RG system.

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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.