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已读[329] 发布: 2013/07/12 20:16:39
有学者对家庭厨房油烟机中冷凝物的总化学成分进行了分析,结果发现,样品中有74种化合物,其中包括烃类、醇酚类、醛酮类、酯类、羧酸类、杂环稠环类、甾醇类等,其中...
已读[248] 发布: 2013/07/12 20:16:35
2.桑树叶 含多种生物碱、甙、酚类物质,具有增强机体免疫杀菌,抗病毒和驱虫作用。 3.樟树叶 含多种生物碱、甙、酚类和樟脑等杀菌驱虫活性物质。每亩用樟树叶...
已读[236] 发布: 2013/07/12 20:16:26
目前,国外大量购买茶多酚取代麻黄素用於减肥药;茶叶中含有三十多种、四大类多酚类物质:即儿茶素类、黄酮及黄酮醇类、花色素类和酚酸类,总称茶多酚。 首先,茶多酚能...
已读[192] 发布: 2013/07/12 20:16:17
WND.com And on-the-job exposure to coal tar pitch, creosote, radium, arsenic compounds and some pesticides also may give rise to skin cancer. Fleischer said that even getting a manicure exposes one to UV radiation, which is used to harden polishes. Compact ...
已读[198] 发布: 2013/07/12 20:12:35
Your Houston News Once fully implemented, the pollution controls required by the settlement will reduce harmful air emissions of sulfur dioxide, volatile organic compounds (VOCs) including benzene, and other hazardous air pollutants by an estimated 4,550 tons or more ...
已读[202] 发布: 2013/07/12 20:11:15
Hydrocarbon Processing Once fully implemented, the pollution controls required by the settlement will reduce harmful air emissions of sulfur dioxide, volatile organic c...
已读[220] 发布: 2013/07/12 20:02:34
Hindu Business Line These products emit less formaldehyde because they contain phenol resins, not urea resins. Pressed-wood products include plywood, paneling, particleboard and fibreboard, and are not the same as ... Some paints also have the ability to absorb ...
已读[451] 发布: 2013/07/12 19:58:10
The Age (blog) The third main quality is all to do with peat's natural phenol compounds , which have long been known to have antiseptic qualities. ' Phenol ' forms the 'P' in TCP (trichlorophenylmethyliodosalicyl), a popular form of antiseptic – especially in the UK. It ... and more »
已读[578] 发布: 2013/07/12 16:56:31
现在使用较多的肉类天然保鲜剂有儿茶酚、香辛料提取物及乳酸链球菌素(Nisin)。它们的防腐效果仍不很理想,Nisin的抗菌谱较窄,今后这方面的研究应加强。 (来源:...
已读[988] 发布: 2013/07/10 19:25:05
③皂化值:是代表挥发油中所含游离羧酸、酚类成分和结合态酯总量的指标。 转发分享: 分享到: 上一篇:主管中药师考试辅导:滴丸举例 下一篇:主管中药师考试辅导:...
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