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Studies on Precipitate of HuanglianHuangqin Couples in Decoction Rapid determination of ferulic acid and identification of its structure in rhizome of Phragmites communis by GC-TOFMS Changes in Chloroplast Proteome of Chinese Cabbage Seedlings Induced by PSⅡInhibiting Herbicide Atrazine Analysis of Volatile Compounds of Meat Flavor Essence Through Two Comprehensive Dimensional Gas Chromatography-time of Flight Mass Spectrometry