工程量清单计价编制指导

建设部于2003年2月17日以第119号公告的形式,发布了《建设工程工程量清单计价规范》。该计价规范的实施,在建设工程计价领域,彻底改变了我国实施多年的以定额为根据的计价管理模式,从而走上了一个全新的阶段。本文就是结合工程量清单计量与计价两大内容进行简单介绍,重点结合实例研究工程量清单计量与计价的编制方法。     

反式(α)-细辛脑的制备技术与应用

反式(α)-细辛脑具有平喘、止咳、祛痰、镇静、解痉、抗惊厥及抗癌的药理活性,医学临床应用广泛。反式(α)-细辛脑在天然植物中含量低导致提取纯品困难,化学合成法是有效的制备途径。主要的合成路线有:以1,2,4-三甲氧基苯为原料经酰化、还原及脱水反应得到;以细辛醛为原料经还原和脱水反应制备;以氢醌为原料经氧化、三乙酰化、甲基化、甲酰化和脱水反应后即可得到反式(α)-细辛脑;以erythro-2-甲基-3羟基-3苯丙酸为原料经立体选择合成直接得到目的产物。反式(α)-细辛脑的分离纯化主要有柱层层析的物理方法和催化异构的化学方法。     

现代中药制剂的进展

本文从中药剂型与制剂的研究进展、新技术新工艺新辅料的研究进展、中药制剂质量控制研究进展三个方面回顾了我国近几十年来中药制剂的发展历程，对文献追踪、整理分类、分析归纳，丰富了中药药剂学理论，中药制剂前处理技术及剂型的改进与创造，优化了中药制剂的质量，扩大了中药剂型的品种和应用范围，从整体上提高了中药制剂的技术水平。     

The preparation and properties of some synthetic photohalide emulsions

(1) A method of preparing photohalide emulsions somewhat different from that of Lüppo-Cramer has been worked out, using either colloidal silver or colloidal silver sulphide as the sensitizer.(2) Treatment of the plates containing this emulsion with chromic acid to remove excess colloidal silver also lowers sensitivity considerably. This sensitivity can be restored by an after-treatment of the plates with a very dilute ammonia solution.(3) The photohalide emulsion prepared as described showed, with one exception, a broader spectral sensitivity than those prepared without colloidal silver or silver sulphide. This agrees with the previous work of others on photohalide emulsions.(4) The spectral sensitivity of such emulsions differs from those sensitized with allyl-thiourea sensitizer in being more sensitive in the red and less sensitive in the green region of the spectrum.(5) The present work supports the strain-ionic deformation hypothesis of sensitivity proposed by Sheppard, Trivelli and Loveland. It does not, however, exclude the hypothesis of Hickman as to the role played by the silver sulphide sensitizing speck.     

The preparation and immunogenic properties of an ultraviolet-inactivated poliomyelitis vaccine

Details of the preparation and the immunogenic properties of an ultraviolet-inactivated poliomyelitis vaccine are described. The data presented indicate that the SK murine strain of the virus may be inactivated by controlled irradiation and yet retain sufficient immunizing potency to protect mice against 1,000 to 10,000 M.L.D. of the active virus administered intraperitoneally or intranasally.     

苯硝化制硝基苯研究进展

综述了近十年来硝基苯制备工艺的发展动态,其中包含固体酸催化的液相、气相硝化,Lewis酸及离子液体催化的液相硝化。最后对苯直接硝基化合成硝基苯提出了一些建议和展望。