固体超强酸催化反应合成丙二醇甲醚乙酸酯

开发了以固体超强酸硫酸钛为催化剂精馏反应合成丙二醇甲醚乙酸酯的新工艺,考察了原料醇与酸的摩尔比、催化剂用量、带水剂用量、反应时间等因素对反应转化率的影响,得到了原料醇完全转化的适宜反应条件原料乙酸与醇的摩尔比1.60,带水剂环己烷与醇的摩尔比5.16,催化剂用量为反应物总质量的3.5%,反应时间3.5h。     

针药结合治疗对缺血性中风患者SOD、MDA影响的临床研究

目的：观察针刺和针药结合对缺血性中风患者SOD、MDA含量的影响.方法：122例急性缺血性中风后期患者随机单盲分为针灸组40例，针灸加药物组34例，药物组48例.20 d为1疗程.结果：针刺与针药结合对缺血性脑梗塞中风的有效率达85%以上，与药物组相比有显著性差异（P＜0.05）.针刺和针药结合组与单纯药物组相比能显著提高MDA含量（P＜0.05）.结论：针刺和针药结合可能通过提高SOD、MDA含量达到治疗中风之目的。     

ENDOSTAB: An Endoscopic Pressure Stabiliser for Minimally-Invasive Cardiac Surgery using Specially Etched Superelastic NiTi Wires for Joint-like Behaviour

For a long time, the only way to access the heart for a bypass operation was to sever the sternum (median sternotomy). Encouraged by the successes achieved by minimally-invasive surgery in other fields, cardiosurgery underwent rapid development, which eventually enabled thoracoscopic operations of the heart. Only with the development of complex robot systems and telesurgery, however, did it become possible to perform exclusively endoscopic bypass operations. Today, the heart-lung machine (HLM) is used as a standard device for bypass operations, with cardiac arrest induced by an infusion. Studies have shown that the HLM may lead to a significant inflammatory reaction and that it is advantageous, particularly for patients with bad cardiac function, to avoid cardiac arrest and keep the heart continuously supplied with blood. ‘Stabilisers’ have been developed to enable bypass operations on the beating heart without using an HLM. For operations on the beating heart using an exclusively endoscopic robot system, an endoscopic stabiliser has been developed, in cooperation with the Leipzig Cardiovascular Institute. The stabilisers that are already available are rigid and, hence, only suitable for an ‘open’ intervention, in conjunction with a retractor. Based on a flexible, superelastic unit made of NiTi, a stabiliser has now been developed that allows endoscopic insertion via a tube of 10 mm in diameter. Joint-like behaviour is achieved by the shaping of the NiTi wires and the specific removal of material in the curved areas. In the operating state, the stabiliser IS still rigid enough to immobilise the desired vascular section. The ENDOSTAB endoscopic stabiliser has already been successfully used in animal experiments at the Leipzig Cardiovascular Institute. The way is thus paved for exclusively endoscopic bypass operations on the beating heart without the use of an HLM.