When topping at the right(neither too early not too late) time the contents of nicotine,nornicotine and nitrite decreased. When late topping the contents of totall nicotine,free nicotine in upper leaves obviousty,increased.
结果表明,早打顶的烤烟上、中、下部叶的降烟碱、硝酸盐、亚硝酸盐含量最高;中(适时)打顶时,它们的含量都降低,但中打顶使上部叶的游离烟碱含量升高,中部叶游离烟碱降低;晚打顶时,上部叶总烟碱、游离烟碱含量增加。
参考来源 - 打顶时间对烤烟特有亚硝胺前体物的影响·2,447,543篇论文数据，部分数据来源于NoteExpress
A suggestion that will be taken up, however, is to provide free nicotine gum and patches to the poorest in society to help cut down on smoking.
但是，有一个提议将被采纳，就是免费提供给穷人尼古丁口香糖和贴剂，以帮助减少吸烟人数。
Call your state's stop smoking line for free advice, nicotine substitutes, and a plan.
打电话给你所在州的戒烟热线，可以得到免费的建议、尼古丁替代品和一个戒烟计划。
Of the three types of nicotine, researchers found that all the brands of e-liquid they tested were the strongest form - free-base nicotine that is easily absorbed by the body.
研究人员发现，他们测试的所有品牌电子烟含有的尼古丁都是游离态的，这是尼古丁三种类型中药性最强的，且很容易被身体吸收。
应用推荐