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Thromboembolic diseases are currently one of the causes that endanger human health and lead to the highest mortality rate, such as myocardial infarction, cerebral thrombosis, deep vein thrombosis, cerebral embolism, pulmonary embolism, etc. In addition, thrombosis is an important pathological process involved in the pathogenesis of many diseases. 1. Anticoagulant therapy (1) Heparin: Heparin is a commonly used anticoagulant and is a highly sulfated glucosaminoglycan. Heparin is widely found in mammalian tissues, and mast cells are the main producing sites. The main sources of medicinal heparin are bovine lung and pig intestinal mucosa. Heparin used clinically is called unfraction heparin (UFH) because it is a mixture of components with different relative molecular weights. The relative molecular weight is between 33,000 and 30,000, which is also called standard heparin (SH). The drug name is heparin sodium. (2) Low molecular weight heparin: crude heparin is cracked into some fraction with relative molecular mass of 1000 ~ 12000 by chemical or enzymatic hydrolysis methods, and then purified. There are at least 10 kinds of low molecular weight heparin prepared by different manufacturers and different methods.朝廷下旨，令各地增调民夫前往骊山修陵，香溪镇需要征调民夫百人，你尽快准备一下。海瑞赴任以来，会稽民风产生了显著的变化，简单来说就是从暗暗仇富，变成明确仇富。Arts and Sports Candidates Fill in Arts and Sports Books and Specialist Volunteers　　和晓纬前来垦丁的外国友人原来是有目的而来，在经过热心又友善的亮亮仔细导览之后，竟然论文阐述垦丁国家公园管理上矛盾与紊乱之处，建议将垦丁从国1. The members of the Party Committee of the Group Company can actively and correctly perform their duties, strengthen their study, unite with each other, be honest and self-disciplined, have a decent style of work, are efficient in their work and have achieved outstanding results. The Party committee team is a united, pragmatic, enterprising and trustworthy team.