Source of sustained voltage difference between the xylem of a potted Ficus benjamina tree and its soil.

PLoS One · 2008 · PMC2493036 · PMID 18698415

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The sentences

a clear trendno p-value reported

2A shows a clear trend of increasing voltage between the xylem and an ionic liquid of increasing pH values.

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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.