The results of the experiments showed Peptone was the best nitrogen source in solid culturate, the second was yeast extract.
结果表明；在固体培养中，病菌对氮源的利用以蛋白胨为最好，其次为酵母膏。
A new kind of nitrogenous product Bionitrogen was tested as a supplemented nitrogen source instead of the corn protein in penicillin fermentation.
生物氮素作为微生物发酵的一种新型氮源，我们首次在青霉素发酵生产上应用。
Manure has become a minor source of nitrogen in all major agricultural countries.
在主要的农业国家动物粪便已经不是氮肥的主要来源。
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