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已读[236] 发布: 2013/06/08 01:17:45
彗星中含有多种较为简单的分子,比如水、氨、甲醇和二氧化碳等,这些物质需要一个合适的环境继续演化,期间还需要大量的能量来“驱动”此类化学反应。 彗星撞击事件为...
已读[291] 发布: 2013/06/07 23:19:35
本发明涉及一种防治小麦雪腐、雪霉病的种子包衣剂及其制备工艺,包括杀菌剂和助剂,其基本组成为(重量百分数):拌种灵5.0%-7.0%,戊唑醇6%-8%,黄腐酸3%-8%,...
已读[242] 发布: 2013/06/07 11:47:33
The Suburban Newspaper Barbecuing meats at high temperatures can change the chemical structure of food and form two potential toxic compounds such as heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAH's). PAH is a chemical that is formed during the burning ...
已读[181] 发布: 2013/06/07 11:47:22
Care2.com When foods like meat are heated over high temperatures or come in contact with flames, compounds called heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs) can form. Both compounds are known carcinogens. Of course you don't ...
已读[182] 发布: 2013/06/06 14:00:23
Seattle Post Intelligencer (blog) The reason is that when meat products are cooked over high temperatures or touched by flames and smoke, they form certain chemical com...
已读[693] 发布: 2013/06/04 03:46:43
Food Safety Magazine Some are commonly expected due to the nature of the commodity or processing method, while others, such as adulterants, initially may be completely unexpected, such as Sudan red dyes and melamine in milk. Unexpected adulterants pose a .... She is ...
已读[211] 发布: 2013/06/03 04:01:27
吲哚是吡咯与苯并联的化合物。又称苯并吡咯。有两种并合方式,分别称为吲哚和异吲哚。含有一个氮杂原子的五元杂环化合物。分子式C4H5N。西地那非有吲哚,建议您...
已读[278] 发布: 2013/06/03 04:01:22
实用型高级研究人才为目标,正逐步建设培养高素质创造性人才所需要的、完备的国内先进水平的教学与实验设施,现已形成精细有机合成、药物合成、杂环化合物合成、高分子...
已读[221] 发布: 2013/06/03 04:01:20
本标准是为工作场所有害因素职业接触限值配套的监测方法,用于监测工作场所空气中杂环化合物[包括吡啶、呋喃和四氢呋喃等]的浓度。本标准是总结、归纳和改进了原有的...
已读[212] 发布: 2013/06/03 04:01:13
在制曲过程中提高曲块的品温,一方面是培育能利用蛋白质分解物氨基酸或是淀粉分解...同时还可以生成呋喃化合物、吡喃化合物等含氮、含氧的杂环化合物,这些物质虽然在...
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