Industry chain construction of Chinese materia medica Advances in studies on sample preparation and pre-treatmen of Chinese materia medica and natural products extracted by supercritical fluid extraction Advances in studies on reversing of multidrug resistance in leukemia by singleChinese materia medica and its components Advances in studies on regulation of Chinese materia medica on cytochrome P450 system Analysis on questions and strategy of Chinese materia medica internationalization