Determination of the Content of Benzoic Acid in Sanguis Draconis of Qili San by TLCS Pharmacognostic Studies on Sanguis Lignum Dracaenae Cochinchinensis Lin Anping Comparative study of effects of xuejie superfine ponders with different diameters and its drop on stopping bleeding Effect of total flavone in Sanguis Draconis on platelet aggregation,thrombus formation and myocardial ischemia Preparation and evaluation of sustained-release microsphere ofSanguis Draconis in vitro