Studies on the Alkaloids of Stephania yunnanensis Simultaneous determination of six ingredients in Yuanhu Zhitong Dripping Pills by HPLC Protective effect of dl-tetrahydropalmatine on liver injury induced by carbon tetrachloride in mice Preparation of molecular imprinted polymers for solid-phase extraction of L-tetrahydropalmatine Influence of penetration enhancers on in vitro transdermal permeation of L-tethrahydropalmatine Studies on the Alkaloids of Stephania macrantha H. S. Lo et M. Yang Effects of L-tetrahydropalmatine on concentrations of neurotransmitter amino acids in mice with cerebral ischemia Effect of l-tetrahydropalmatine on expression of adhesion molecules induced by lipopolysaccharides in human umbilical vein endothelium cell