The community distribution of bacteria and fungi on ancient wall paintings of the Mogao Grottoes.

Sci Rep · 2015 · PMC4291566 · PMID 25583346

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a decreasing trendno p-value reported

an increasing trendno p-value reported

The distribution of Firmicutes exhibited a decreasing trend from the earlier Northern Wei Dynasty to the later Yuan Dynasty, while Proteobacteria exhibited an increasing trend.

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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.