A technology for strongly improving methane production from rice straw: freeze-thaw pretreatment.

RSC Adv · 2018 · PMC9081385 · PMID 35539703

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showed a trendno p-value reported

4A , the methane content of group A showed a trend of increasing first and then decreasing followed by a stable status.

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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.