The 40 people with undetectable levels of nicotine and cotinine were classified as nonsmokers;
40位未检出尼古丁和可替宁的志愿者被归类为“非烟民”；
The blood tests check for cotinine- a byproduct of nicotine that usually is detectable for up to four to five days.
验血检查cotinine——一种尼古丁的副产品通常四到五天可被发觉。
They found that there was no level of nicotine or cotinine that did not also correlate with genetic abnormalities.
他们发现零尼古丁或可替宁水平也与基因异常不相关。
Research has shown that menthol cigarettes may provide higher levels of carbon monoxide, nicotine and cotinine per cigarette smoked than regular cigarettes.
研究表明，吸一根含薄荷醇的烟比吸一根一般的烟所摄取的一氧化碳，尼古丁和可替宁量更多。
A reversed phase ion-pair high performance liquid chromatographic method was developed for the simultaneous determination of nicotine and cotinine in human hair.
以庚烷磺酸钠为离子对试剂，建立了同时测定头发中尼古丁和可天宁含量的反相离子对高效液相色谱方法。
But even after controlling for this factor, he found that the greater the levels of cotinine, the greater likelihood that the subject would show signs of psychological distress.
然而，在这些干扰因素得到控制后，他还是发现，随着尼古丁含量的升高，被试显示出心里困扰的几率也随之增大。
The subjects also provided urine so the researchers could measure the amount of nicotine and its metabolites, like cotinine, for an objective record of their exposure to cigarette smoke.
这一项目中还包括尿检，因此研究人员还可以测量尿中尼古丁及其代谢物的含量（如可铁宁），这样会得到有关他们处于烟雾中时的情况的比较客观的记录。
In their study, the researchers tested blood for cotinine, a chemical which is produced when nicotine is metabolized, so they got an objective measure of how much smoke the teenagers were exposed to.
在研究中，研究人员对血液进行了可替宁测试。可替宁是尼古丁的代谢产物，这样他们就可以客观地衡量青少年吸入的二手烟的数量。
In their study, the researchers tested blood for cotinine, a chemical which is produced when nicotine is metabolized, so they got an objective measure of how much smoke the teenagers were exposed to.
在研究中，研究人员对血液进行了可替宁测试。可替宁是尼古丁的代谢产物，这样他们就可以客观地衡量青少年吸入的二手烟的数量。
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