when did Rudolf Virchow give the phrase to cell theory "Omnis cellula e cellula"
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One of the chemicals, salicylic acid (SA) induces systemic acquired resistance (SAR) in plants. The activation of SAR provides a broad-spectrum resistance against a wide range of related or unrelated pathogens. ... Molecular mechanism of plant defense induced by synthetic chemical inducers is not very well understood.
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in 17th century
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