查询词典 nornicotine

A method for chiral analysis of anatabine,nornicotine and anabasine in tobacco has been established.

建立了烟草中新烟草碱、降烟碱和假木贼碱的手性分析方法。

Simultaneous Scan-Selected ion monitoring mode is a new improvement method of data acquisition of gas chromatography mass spectrometry. The determination method of alkaloids in tobacco was established by Scan-SIM of GC/MS. Nicotine, nornicotine, anabasine and anatabine were determined with Scan mode, and myosmine, nicotyrine, 2,3'-Bipyridyl and cotinine were determined with SIM mode.

建立了应用气相色谱-质谱全扫描-选择离子监测数据采集方式同时测定烟草中8种含量相差较大的生物碱的方法，采用Scan模式分析烟碱、降烟碱、新烟碱、去氢新烟碱，同时采用SIM模式分析麦斯明、二烯烟碱、2，3′-联吡啶、可铁宁。

The content of nornicotine is higher after flue-curing than before flue-curing.

湿度对烟碱含量影响无明显的规律性。

Both high temperature and high humility are beneficial to formation and accumulation of nornicotine during yellowing .

去甲基烟碱含量烤后较烤前增加，而且变黄期高温、高湿均有利于去甲基烟碱的形成和积累。

There was no significant difference in total alkaloid levels among different cigarette samples in the same year, while nicotine and nornicotine contents varied reversely, resulting in a ladder of percent nicotine c...

同一年份的卷烟样品间总生物碱含量无显著差异，烟碱含量和降烟碱含量呈相反趋势变化，从而形成样品间烟碱转化率的梯度差异。

Methyllycaconitine , alpha bungarotoxin , nicotine, and nornicotine were also tested for comparison.

作为对比，甲基牛扁亭，α-银环蛇毒素，烟碱和去甲基烟碱也同时作了测试。

The character of flower colour and high nicotine conversion inherited steadily,the average nicotine content of their offsprings decreased,while nornicotine content increased significantly.

通过对发现的5株白肋烟B37花色突变株后代的连续观察与研究，结果表明，5株白花突变株当代均为高烟碱转化株；随着世代的增加，白花后代群体花色遗传稳定，高转化率性状更趋于纯合；烟株群体的平均烟碱含量明显下降，降烟碱则明显上升，烟株群体生物碱表现为以降烟碱为主。

Tobacco Alkaloid Nicotine Nornicotine Percent nicotine conversion Sensory evaluation Cigarette smoke Tobacco-specific nitrosamines

烟草；生物碱；烟碱；降烟碱；烟碱转化率；感官评吸；烟气；烟草特有亚硝胺

Nornicotine is produced by the N-demethylation of nicotine during the post-harvest treatment of tobacco leaves.Nornicotine in tobacco serves as the precursor in synthesis of the well-characterized carcinogen N'-nitrosonornicotine, one of the tobacco-specific nitrosamines, and consequently damages the health of tobacco smokers and passive smokers.

烟叶的采收后处理和加工过程中，大量的尼古丁经去甲基化作用生成了去甲基尼古丁，后者是烟草特有的亚硝胺类(tobacco-specific nitrosamines， TSNAs)致癌物——亚硝基去甲基尼古丁(nitrosonornicotine， NNN)的前体，与人类健康息息相关。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。