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The discovery of these genes could, therefore, help improve the nitrogen use efficiency of some types of tobacco, as well as other commercially important crops -- ultimately reducing the need for chemical fertilizers The impact of Burley's lower nitrogen use efficiency on its metabolism and growth means that some plant variants contain increased levels of nicotine, other alkaloids, and nitrites, resulting in higher levels of tobacco-specific nitrosamine (TSNA) compounds in their leaf

Providers can refer your patient by fax, phone call, or on their website

And while any person who knowingly furnishes an alcoholic beverage to any person under 21 years of age is guilty of a misdemeanor, the law provides only for criminal penalties, not civil liability

Christopher Wanjek is a Live Science contributor and a health and science writer

They are fairly expensive