Spectrum-activity relationship on anti-hepatic fibrosis efficacy of Trionycis Carapax Spectrum-effect relationship on anti-gastric ulcer effect of Astragali Radix Spectrum-activity relationship of hemagglutination components in Isatidis Radix Spectrum-effect relationship on anti-gastric ulcer effect of Astragali Radix Spectrum-activity relationship of hemagglutination components in Isatidis Radix Screening of constituents with antiproliferative activity in Panax notoginseng and their underlying mechanisms