Effects of nitrogen,phosphorus,and potassium on seedling growth and stachydrine and total alkaloid from Leonurus japonicus Fingerprints of Leonurus heterophyllus Injection with capillary electrophoresis Effect of stachydrine on expression of PERK of endoplasmic reticulum in renal tissue of rats with unilateral ureteral obstruction Determination of stachydrine hydrochloride and leonurine hydrochloride in Yimucao preparations by HPLC-MS