Optimization of extraction process for Corydalis Rhizoma and correlation analysis on its chemical constituents and pharmacodynamic index Optimization of extraction procedure of psammosilene tunicoides by uniform design with pharmacodynamic index Optimization of extraction process for Corydalis Rhizoma and correlation analysis on its chemical constituents and pharmacodynamic index Ramet Age Structure and Its Dynamics of Nitraria tangutorum Clonal Populations in the Southern Margin Area of Tengger Desert