硝化

The results show that the performance of oxygen transfer could be obviously improved when the diameter of draft tube is 5.5 cm and 13 static mixers is used.

研究发现，当导流筒直径取5.5cm，并在导流筒内安装13个静态混合元件时，这种改进型硝化反应器的氧传递能力显著提高。

Bromo-5-formyl -3-methylpyrrole is an important intermediate of tolyporohin. On the base of introducing the present research and development of tolypo- rohin and pyrroles ramification at home and abroad, an emphasis was made on synthesis of 2-Bromo-5-formyl -3-methylpyrrole and the technical conditions of all steps, which was described as follows. Diethyl 3,5-dimethylpyrrole-2,4-dicarboxylate was made by nitrification, reduction and cycle of ethyl acetoacetate.

由于2-溴-5-甲酰基-3-甲基吡咯是合成托尼卟吩的重要中间体，本文在阐述了当前托尼卟吩及吡咯衍生物的国内外研究和开发的基础上，重点研究了2-溴-5-甲酰基-3-甲基吡咯的合成，并对各步反应进行了工艺研究，具体合成步骤如下：本文通过对乙酰乙酸乙酯的亚硝化、还原、成环，反应生成吡咯单环衍生物2，4-二乙氧羰基-3，5-二甲基吡咯。

Denitrification is a microbial process in which oxidized nitrogen compounds are used as alternative electron acceptors for energy production.

反硝化是微生物以氮氧化物作为电子受体产生能量的过程。

The results show that autotrophs maximum growth rates varied from 0.32 d^(-1) to 0.54 d^(-1) and the average rate was 0.45 d^(-1) at 20℃.

试验结果表明，硝化系统内自养细菌最大增长速率在20℃时的变化范围为0.32~0.54d^(-1)，平均值为0.45d^(-1)。

Flavonoid is a kind of natural antioxidant and there were many researches concerning its antioxidative effect and pharmacology.

本文的主要工作就是研究铁/铁卟啉引起的氧化和硝化损伤以及天然抗氧化剂黄酮的保护作用。

With the increase of establishment years, most of plant communities on the grasslands showed a "V" type change trend in their quantities, i.e., high-low-high, hut the forbs biomass had a "Λ" type change trend and the sedge biomass increased gradually. Soil nutrients presented a "V" type hut soil hulk density presented a "Λ" type change trend, bile soil pH presented a decreasing trend. Most of soil microbial physiological groups and microbial biomass carbon showed a "V" type change trend, phosphorus-dissolving bacteria showed a "Λ" type change trend, denitrifying bacteria decreased gradually, while cellulose-decomposing bacteria showed an increasing trend.

结果表明：随着人工草地建植年限的增加，植物群落的数量特征多呈高－低－高、杂类草生物量低－高－底、莎草生物量增加的趋势；土壤养分变化为高－低－高、容重为低－高－底、pH呈下降趋势；土壤中多数微生物的数量及微生物生物量碳含量的变化为高－低－高，纤维素分解菌数量逐渐升高，而反硝化菌数量逐年下降，溶磷菌数量呈低－高－低的动态变化。

Meanwhile, the activation of caspase-3 could be found increased in ClearCa-6 with lower expression of XIAP, but not in ClearCa-2 with higher expression of XIAP when exposed to various apoptotic inductions.

4意外发现Nitrite存在下UVA的照射可引起Caspase-3活性的抑制，并证明此抑制作用的直接机制是UVA使Nitrite在光解作用中释放NO，使Caspase-3受到亚硝化修饰而丧失活性。

Adopting 30-second nitrocellulose as the main sticky material, using ethyl acetate, ketone, alcohol and aromatic hydrocarbon as a mixture solvent and modifying nitrocellulose with dimethyl phthalate plasticizer,the prescription of staple adhesive was designed with orthogonal experimental methodology.

选用30s 硝酸纤维素作为主要成膜物质，醋酸酯、酮、醇和芳烃作为组合溶剂，邻苯二甲酸酯类复合增塑剂对硝化棉进行改性，采用正交试验方法确定胶黏剂的配方。

This study investigated the biodegradation of benzene in laboratory anaerobic microcosms.

但是，苯—溶解度大且为致癌物，在厌氧条件下，特别是反硝化条件下的生物降解仍是一个有争议的问题，限制了生物恢复技术的应用。

In the three SBR reactors,the phenomenons of denitrifying dephosphatation with NO3——N and NO2——N as electron acceptors and the traditional biological phosphorus accumulation with O2 as electron acceptor were investigated respectively.

在3个SBR反应器中，分别考察了以NO3--N和NO2--N为电子受体的反硝化除磷现象，以及传统以O2为电子受体的生物聚磷现象。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。