不含氮的

The key point is that the Gulf of Eilat is an oligotrophic sea, a sea that does not have nitrogen at all,Loya explained.

洛亚解释道："关键是埃拉特海湾是一片营养贫乏、完全不含氮的海域。"

A nonnitrogenous food substance consisting chiefly of starch; any substance resembling starch .

一种不含氮的食物，主要由淀粉组成；任何类似淀粉的物质。

Under normal circumstances, this is not a problem because food proteins contain only the major components of nitrogen and other major components are not nitrogen, the Kjeldahl method is a very accurate determination of protein content .

在通常情况下，这不是个问题，因为食物中的主要成分只有蛋白质含有氮，其他主要成分都不含氮，因此凯氏定氮法是一种很准确的测定蛋白质含量的方法。

The chemical analysis of N, P and K in organic fertilizer is presented: sample is decomposed by sulfuric acid-hydrogen peroxide and prepared to be a solution. N can be determined by NC-2 model quick N analysis set, P by chinoline molybdic acid method and K by tetraphenylboron potassium, needless of spectral photometer and flame photometer, the method is available when the content of N, P or K is over 0.1% with desired accuracy and precision.

介绍用化学分析方法测定有机肥料氮、磷、钾的含量，即样品经硫酸-过氧化氢消化后，制备待测溶液，分取待测溶液用NC-2型快速定氮仪测定氮，用磷钼酸喹啉重量法测定磷，用四苯硼酸钾重量法测定钾，不需使用分光光度计和火焰光度计，适宜一般复混肥料厂采用，对含氮、磷、钾分别达0.1％以上的样品均可用本法测定，方法的准确度和精密度能满足生产的要求。

The key point is that the Gulf of Eilat is an oligotrophic sea, a sea that does not have nitrogen at all,Loya explained.

洛亚解释道：&关键是埃拉特海湾是一片营养贫乏、完全不含氮的海域。&

The nitrogen in fossil fuels is more refractory than sulfur, and microbial approaches for petroleum denitrogenation could be beneficial as the classical hydroprocessing methods are costly and unefficient.

化石燃料中所含的有机氮较有机硫更难以去除，常规的化学脱有机氮技术高压加氢法处理燃油能耗高，处理效果不理想等方面的缺陷使人们思考生物脱氮的可能性。

As there was no nitrogen in the solution before experiment, the nitrogen in amino acids should have resulted from deposition of 〓 from outside.

由于反应溶液中本不含氮，故氨基酸中的氮应是外来氮离子沉积于溶液中的结果。

Protein is mainly made of amino acids, its nitrogen content is generally not more than 30%%, while nitrogen content as per melamine molecular formula amounts to 66％%.

蛋白质主要由氨基酸组成，含氮量一般不超过30%%，而三聚氰胺的分子式含氮量达到66％。

Such compositions comprise at least one textile-cleaning surfactant; droplets of miscible silicones comprising both a polarly-functionalized, preferably nitrogen-containing amino or ammonium functionalized, polysiloxane component and a nitrogen-free non-functionalized or non-polarly-functionalized polysiloxane component; and a perfume component comprising fragrant aldehydes and/or ketones or a pro-perfume capable of providing such aldheyde and/or ketone perfume materials in situ.

这些组合物包含至少一种纺织品清洁表面活性剂；可混溶硅氧烷液滴，所述可混溶硅氧烷液滴不仅包含极性官能化的聚硅氧烷组分，优选含氮的氨基或铵官能化的聚硅氧烷组分，而且还包含不含氮的非官能化的或非极性官能化的聚硅氧烷组分；和包含芳香醛和/或酮的香料组分或能够就地提供这些醛和/或酮香料物质的前香料。

The teatments of urea application rate reduced by 5%～15% and added compound nitrogen fertilizer synergists,the growth and nitrogen content of maize were not significat changed,and the total ~(15)N uptake and nitrogen uptake by maize were the same as CK_2 or increased a little.

氮素减量5%~15%时配施复合氮肥增效剂对玉米生长和含氮量影响不显著，15N和吸氮总量与不施增效剂的处理相当或有所提高。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷