硝酸

The mechanism of nitrate accumulation in six spinach ( Spinacia oleacea L.) varieties under low nitrogen level was studied in a pot experiment.

提要 盆栽试验条件下，菠菜体内的硝态氮含量及硝酸还原酶活性因品种和部位而异。

The product was made from ritric acid and isoamyl alcohol with sulfuric acid as catalyst, and urea as stabilizator in the reaction.

以异戊醇和50％HNO3为原料，50％H2SO4为催化剂，尿素为反应稳定剂，合成了柴油十六烷值改进剂——硝酸异戊酯。

By reducing the end diastolic pressure and volume isosorbide mononitrate lowers intramural presure hence leading to an improvement in the subendocardial blood flow.

通过减低舒张末期血压和容积，单硝酸异山梨酯降低壁内压，从而使心内膜血流得到改善。

The effects of many parameters, such as the amount of surfactant, airflow rates, pH, NaCl, ethanol and temperature on the solvent sublation were studied. Experimental results showed that a ratio of surfactant to Pb-dithizone complex (2∶1) was the most effective for the removal, with over 97.4% Pb removed from the aqueous solution in 40 min by solvent sublation, at the value of pH 12.6.The solvent sublation process followed first order kinetics. A characteristic parameter, apparent activation energy of attachment of the sublate to bubbles, was estimated at a value of 2.08 kJ/mol.

结果表明，当表面活性剂与硝酸铅物质的量之比为2∶1时，铅去除率达97.4％；体系去除率在pH值为12.6时最高；有机溶剂的影响不明显；少量的乙醇可提高其去除率和去除速率，但过多会产生抑制作用；适量的NaCl能提高体系去除率，但随着浓度的提高呈现下降趋势；去除速率随气流速率增加而增加，体系去除率随温度升高而递增；反应过程遵从一级动力学，表观活化能为2.08 kJ/mol。

Key words摘要: diazotizationcoupling reaction;resonance scattering spectra;nitrite;sulfanilic amide;N,Ndimethyl aniline

重氮化偶联反应；共振散射光谱；亚硝酸根；磺胺；N，N二甲基苯胺

The Ag adsorbed on TiO2 nanoparticles could be eluted completely by mixed solution of nitric acid(1 mol/L) and sulfourea(2 g/L).

硝酸和硫脲混合溶液可将吸附在TiO2纳米颗粒表面的Ag全部洗脱。

DETERMINATION OF SULPHATED ASH.

NF T20-262-1968 盐酸、硝酸的化学分析。

MethodsThe OA rabbit model was established by immobilized in full extension for up to six weeks. Eighteen rabbits were randomly divided into the DEA group, the acupotomy group (treated with acupotomy and manipulation) and the control group (treated with manipulation alone). The treatment was applied once every three days for 1 month as a course. NO in articular synovia was measured by nitrate reduction method, and the apoptosis rate of chondrocyte was determined by flow cytometry.

方法应用关节制动的方法复制骨关节炎模型，18只造模成功的中国家兔，随机分为高频电火花水针组、水针刀组和对照组，A组用高频电火花水针加手法治疗，B组水针刀加手法治疗，C组仅予以手法治疗。1次/d，疗程为1个月，用硝酸还原法检测关节滑液中NO含量；用流式细胞仪检测软骨细胞的凋亡率。

Eighteen rabbits were randomly divided into the dea group, the acupotomy group (treated with acupotomy and manipulation) and the control group (treated with manipulation alone). the treatment was applied once every three days for 1 month as a course. no in articular synovia was measured by nitrate reduction method, and the apoptosis rate of chondrocyte was determined by flow cytometry.

方法应用关节制动的方法复制骨关节炎模型，18只造模成功的中国家兔，随机分为高频电火花水针组、水针刀组和对照组，a组用高频电火花水针加手法治疗，b组水针刀加手法治疗，c组仅予以手法治疗。1次/d，疗程为1个月，用硝酸还原法检测关节滑液中no含量；用流式细胞仪检测软骨细胞的凋亡率。

For example at point A, a number of structures are visible even though the most intense peak is that of the tetrahydrate.

例如，在A点，虽然最强的高峰是四水硝酸镍的，但还有一些结构清晰可见。

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。