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《制药原料及中间体信息》2008,(4)
到目前为止,已发现了一系列颇有价值的免疫激活剂,其中包括:微生物代谢物类免疫激活剂、植物类免疫激活剂以及尚未确定具体活性成分但肯定有提高人体免疫力的植物及其提取物。 相似文献
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本文概括介绍了微生物作为植物抗病激活剂的研究进展情况,以及微生物抗病激活剂的主要作用机理。 相似文献
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植物防病激活剂(plant activator)是近年来发展的,具有全新作用机理的一类新颖农药。传统杀菌剂须作用于相应的靶标才能发挥作用,但植物防病激活剂自身并无明显的杀菌活性,但它却能诱导植物本身的免疫机制,使植物系统获得抗性(System acquired resistance,SAR),从而达到抗病,防病的目的。在植物防病激活剂中,苯并噻二唑类结构则为典型的一类,其中前诺华公司开发的活化酯(acibenzolar,代号CGA245704)(图1)即为最突出,并已商品化的植物防病激活剂。 相似文献
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传统农药多以杀死有害生物为目的。由于安全、生态和环境方面的压力,新农药开发周期逐渐延长,投入经费逐年增加,开发成功率也日趋下降。尽管化学农药正发挥着无可替代的重要作用,利用植物自身的防御系统来防病、治虫也是今后农药发展的重要方向,苯并噻二唑类植物抗病激活剂的成功开发在这方面迈出了可喜的一步。 相似文献
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以三乙基铝为助催化剂,环已基甲基二甲氧基硅烷为外给电子体,使用NDQ催化剂在400 kt/a的Spheripol聚丙烯工业装置上试生产了注塑专用聚丙烯HA8012和HP-M12。结果表明:试生产期间,装置运行平稳,聚合工艺参数可控可调,聚丙稀细粉含量低;采用NDQ催化剂生产的HA8012和HP-M12具有较宽的相对分子质量分布(6.0~6.5)、较低的二甲苯可溶物含量(质量分数为1.5%~2.0%)、较高的拉伸强度(大于38 MPa)和弯曲模量(1.8~2.2 GPa)。 相似文献
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海洋石油富岛有限公司脱碳系统采用苯菲尔热钾碱法脱除CO2,采用两段吸收两段再生工艺,活化剂为ACT-1。因特殊原因,脱碳装置使用活化剂ACT-1断供,为了维持脱碳装置的效果,确保装置达标稳定运行,2021年9月1日~6日,在脱碳系统中使用206新型活化剂代替原活化剂ACT-1,初步应用表明,206新型活化剂能够有效提高溶液的吸收和再生效果,改善气体质量,同时可较好地控制溶液对设备及管线的腐蚀,其工业应用效果良好,具有现实推广价值。 相似文献
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烯丙苯噻唑作为一个作物抗病激活剂品种重新受到人们的关注。介绍了该品种及其主要中间体的几种合成方法。建议采用以邻磺酸基苯甲酸为起始原料的化学合成法。 相似文献
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针对合成氨装置脱碳系统前期吸收效果较差的状况,通过向其添加ACT-1以逐步取代原活化剂DEA等措施的实施,脱碳运行工况大为改善,取得了明显的经济效益。 相似文献
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Performance of a new cationic bleach activator on a hydrogen peroxide bleaching system 总被引:1,自引:0,他引:1
Sang-Hoon Lim Nevin Çigdem Gürsoy Peter Hauser David Hinks 《Coloration Technology》2004,120(3):114-118
The performance of a cationic bleach activator, N -[4-(triethylammoniomethyl)benzoyl]caprolactam chloride, was evaluated in a hot peroxide bleaching process. The effect of time, temperature and the concentrations of hydrogen peroxide and activator on the bleaching of cotton fabric was investigated using a central composite experimental design. Temperature was found to be the most significant parameter. By adding the cationic activator it was possible to achieve a level of whiteness comparable to a typical commercial bleaching system but under relatively mild conditions of time and temperature. As a consequence, chemical damage to the fabric could be reduced. The effect of the cationic bleach activator was compared to that of an anionic activator, nonanoyloxybenzene sulphonate. The cationic activator was superior to the anionic activator in bleaching the fabric under the optimised conditions used in the study. Received: 13 January 2004, Accepted: 10 March 2004 相似文献
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Bleaching of cotton with activated peroxide systems 总被引:5,自引:0,他引:5
The bleaching performance of a novel cationic bleach activator, N -[4-(triethylammoniomethyl)benzoyl]-caprolactam chloride, was compared to that of nonanoyloxybenzene sulphonate, a commercially available anionic bleach activator. The whiteness of bleached cotton fabric was used as a measure of the performance. Comparison of bleach performance and the effect of key variables were evaluated using a central composite experimental design. The performances of both activators increased with temperature and sodium hydroxide concentration. Also, the performance of the cationic bleach activator increased with activator concentration, while an increase in the concentration of nonanoyloxybenzene sulphonate gave an adverse effect on the performance. It was found that the cationic bleach activator was superior to the anionic activator in the hot bleaching of cotton under the conditions studied. 相似文献
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