Tobacco is an important economic crop, and nitrogen is essential mineral element. Studies on carbon and nitrogenous metabolism of tobacco have important action on tobacco production.
烟草是中国一种重要的经济作物，而氮是植物必需的矿质养分，研究烟草碳氮代谢规律，对指导烟草的生产具有重要的作用。
Oxygen in short supply makes metabolism of carbon and nitrogen weak, which is unfavourable to synthesis of penicillin.
一旦反应器供氧不足，菌体碳、氮源代谢能力减弱，不利于青霉素合成。
In low nitrogen level, the time from nitrogen metabolism to carbon metabolism was shorten; however, in high nitrogen level, the time was deferred.
低氮水平下由氮代谢转化为碳代谢的时间提前，高氮水平下由氮代谢转向碳代谢的时间推后。
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