氮

For distinctly understanding the mutual influence between the structural units, a series of compounds from five and six-membered C-N heterocycle substituting the tetrazine ring are designed. These several types of compounds are studied by means of the quantum chemistry calcualtions and discussed the influence of the structural units upon the main performance (heat of formation, density, velocity and pressure of detonation) and found out the best combination of performance.

为了更清楚的了解结构单元之间的相互影响，设计了六元氮杂环和五元氮杂环取代1，2，4，5-四嗪得到了一系列化合物，采用量子化学计算方法对它们进行了详细的理论研究，讨论了各种氮杂环的改变对四嗪类化合物性能(包括生成热、密度以及爆速和爆压等)的影响，并找出爆轰性能较好的结构单元组合。

Chart3: variation of water nutrition value in aquaculture pools,infall and outfall

图3为无机盐（硝酸氮，亚硝酸氮，氨氮，非离子氨）和磷酸盐含量变化图。

At the firstexperiment, when the Nitrogen valid content is 0kg/hm~2, the Phosphatevalid content is 112.5 kg/hm~2, the Kainite valid content is 112.5 kg/hm~2,the Sulphur valid content is 60 kg/hm~2, we can acquire the highestoil-content 45.87%. At the second experiment, when the nitrogen validcontent is 0kg/hm~2, the Phosphate valid content is 112.5 kg/hm~2, theKainite valid content is 112.5 kg/hm~2, we can acquire the highestoil-content 44.08%.

本试验条件下在低氮、中磷、中钾水平下可以获得较高的含油量；在第一次试验中当氮、磷、钾、硫的有效含量分别为0kg／hm~2、112.5kg／hm~2、112.5kg／hm~2、60 kg／hm~2时可以获得最高含油量45.87％；在第二次试验中当氮、磷、钾的有效含量分别为0kg／hm~2、112.5 kg／hm~2、112.5 kg／hm~2时可以获得最高含油量44.08％。

N uptake rate of high-responding eultivars increased significantly with increasing N rate, while their total root length exhibited a comparatively lower variation.

水稻氮积累总量与总根长和平均吸氦速率的相关关系的分析结果表明，平均吸氮速率对水稻苗期获取氮能力的贡献率大于其总根长的贡献率。

Difference in N uptake responsiveness was linked to their difference in N uptake rate and root characteristics. N uptake rate of high-responding cultivars increased significantly with increasing N rate, while their total root length exhibited a comparatively lower variation.

对氮响应度高的4个水稻品种的平均吸氮速率随着供氮水平的增加其增幅显著，而其总根长的变化幅度则较小。

The dynamic change of NH4+, NO3- and TN, under the situation which urea was applied in the high fertility paddy-field in Yuhang of Hangzhou city with a lysimeter which was designed and made by ourselves, was studied and analyzed in order to find the rules of the change in the water-body of surface and the leakage rule of nitrogen, to reduce the effect of nitrogen loss on the water pollution.

借助自行设计制作的稻田渗漏计，在杭州余杭对高肥力稻田不同施用尿素氮肥情况下，稻田地表水和渗漏水中铵态氮、硝态氮和总氮的动态变化规律进行了研究分析，以利于发现氮素在地表水体变化和淋失规律，尽量减少氮素淋失对地下水体所造成的影响。

The pathogen grew well on the media using glucose, sucrose, fructose, maltose, rhamnose or soluble starch as carbon sources. Galactose, xylose, mannite or sorbose was not beneficial for the growth of the pathogen, however. The media with only organic or inorganic nitrogen sources were not suitable for the pathogen growth although organic nitrogen sources were better than inorganic nitrogen sources. The pathogen could also infect Allium cepa L., A. fistulosum L. and A. odorum L. under artificial inoculation conditions.

在碳源中，以对葡萄糖、蔗糖、果糖、麦芽糖、鼠李糖和淀粉的利用为佳，而半乳糖、山梨糖、甘露醇、木糖和菊糖不利病菌的生长；有机氮源优于无机氮源，但单独应用有机或无机氮作为营养均不适于此病菌的生长；在人工接种条件下，病菌可侵染葱、洋葱和韭等葱属植物。

According to Griess reaction, diazonium-salts formed from aromatic amines such as sulfonamides etc., react with NaNO_2 in acid medium and may be coupled with α-naphthylamine or diphenylamine to produce red colored compounds.

一按Griess反应芳香族胺类的重氮化鹽，如对氨基苯磺醯胺类药物等，在酸性溶液中皆能与α-萘胺或二苯胺分别偶合成偶氮色素而显紅色，过多之亞硝酸可与氮色素再作用使紅色消失而呈棕黄色。

Effects of nitrogen-degrading microbes on biological characteristics of the growth of water hyacinth, the contents of nitrogen and phosphorus in water, and the dynamic change of microorganism in water were analysed by the elimination of nitrite, organic nitrogen and phosphor in water by nitrobacteria and denitrobacteria.

利用硝化细菌与反硝化细菌对水体中亚硝酸盐、有机氮、磷等营养物质的消除作用来分析降氮灵菌剂对水葫芦生长的生物学特性、水体中氮磷含量变化以及水体中微生物消长动态的影响。

The nitrogen balance experiments show that most of nitrogen is removed as gas, so it achieves the aim of nitrogen removal.

同时，通过氮平衡实验反映出系统对氮的去除大部分是气态形式去除的，达到真正的脱氮目的。

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