亚硝酸

The absorption of root system was the main sources of nitrogen in the plant.The effects of matrix ventilation on the abaorption,transportion and metabolism of nitrogen in the root system of cucmber were discussed deeply.The results showed that contents of ammonium,nitrate,free amino acids and soluble protein in cucumber roots were higher in G1 treatment.Contents of ammonium,nitrate and free amino acids in cucumber roots were the trend of the dropping after the first rising in F1 treatment,but contents of soluble protein was lower11.03%than that of the control.

根系吸收是植物体内氮素的主要来源，本研究深入探讨了基质通气状况对黄瓜根系氮素吸收、运输和氮代谢的影响，结果表明G1通气处理根系的铵盐、硝酸盐、游离氨基酸和可溶性蛋白含量均较高；非通气处理(F1处理)根系内铵盐、硝酸盐和游离氨基酸含量呈先升高后降低的趋势，而可溶性蛋白含量始终较低，比对照降低11.03%。G1处理根系硝酸还原酶、亚硝酸还原酶、谷草转氨酶、谷丙转氨酶、谷氨酰胺合成酶活性均较高；而F1处理的酶活性在处理末期显著降低，其中谷氨酰胺合成酶活性比对照降低33.33%。

ABSTRACT Bacillus halodenitrificans (ATCC 49067), a moderate halophile, facultative anaerobe and Gram-positive denitrifier, reduces both nitrate and nitrite to nitrous oxide as the final denitrification product.

Bacillus halodenitrificans（ATCC49607），是一种能将硝酸根和亚硝酸根还原成终产物N〓O的中性嗜盐、兼性厌氧的格兰氏阳性反硝化真细菌。

FISH (Fluorescent In Situ Hybridization) was a rapid and simple method to detect the distribution and relative quantities of nitrifying bacteria in the floe of activated sludge.

荧光原位杂交对受锌离子污染的活性污泥微生物的检测表明，实验组硝酸细菌的分布和丰度与对照组的巨大差距是导致氨氮和亚硝酸根转化率低下的直接原因。

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。

This method was applied to the analysis of nitrite and nitrate in environmental water with satisfactory result.

应用于环境水样中硝酸根和亚硝酸根的同时测定，结果满意。

The oxidation of mono-methylhydrazinewith nitrous acid in nitric acid medium was researched.

采用分光光度法研究硝酸介质中单甲基肼与亚硝酸(HNO_2)的反应。

At the same time, the enthalpy change of 212 kJ/mol for Tempo trapping methyl radical, namely O-〓 bond dissociation energy has been also obtained. This value is close to that of nitrous acid ester and far less than that of nitric acid ester. It is probably due to the relatively strong electron withdrawing capability of nitryl group.

同时我们还测得了甲基自由基与Tempo的反应的焓变，即O—〓键离解能为212 kJ／mol，它接近于亚硝酸甲酯中C—O键的离解能，而小于硝酸甲酯中的键离解能，这可能和硝酸根的吸电子能力较大有关。

Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis and spectrometric detection.

用流量分析法和光谱检出法测定亚硝酸氮和硝酸氮及两者的总含量CFA和

The sludge age in the reactor is large, so that nitrobacteria and nitrosomonas live together. The nitrogen removal via nitrite was possible mainly because the activity of nitrobacteria was inhibited rather than rushed out in number.

反应器内的污泥龄较长，硝酸菌和亚硝酸菌长期共存，发生短程硝化反硝化主要因为硝酸菌的活性受到抑制，而不是数量上受到淘汰。

Electrode potential was in direct proportion to concentration of NO〓〓 in range of 1.0×10〓 and 50×10〓mol/L slope of Nernst response is

并用选择性电极实时观察了亚硝酸根在聚吡咯膜中的掺杂＝释放过程，在1.0×10〓～5.0×10〓mol/L浓度范围内，电极电位与亚硝酸根浓度呈线性关系，Nernst响应斜率为

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。