氮的

The comparative experiments of rearing Penaeus vanname larvae fed the microencapsulated diets and micro-partical diets of "OK" brand and a searies of microgranular diets of "Bonasse" brand was performed. Two brands of diets are respectively formulated with rotifera at percentage of 70%, 80%, 90% and 100%. During the nursery period, the water quality factors such as the concentrations of NH3-Nt, NH3-Nm, NO2-- N, COD and main planktons were tested to find out their change regulation and the influence on survival rates and metamorphic rates of shrimp larvae.

本文利用欧开牌微胶囊饲料、微粒饲料和博尚牌系列微型饲料作为对虾育苗饲料，分别以70％、80％、90％和100％的比例与卤虫活饵料配合来培育凡纳对虾幼体，通过对凡纳对虾幼体有关生长发育指标的对比以及对育苗期间水中总氨氮(NH_3-N_t)、非离子氨氮(NH_3-Nm)、亚硝酸盐氮(NP_2~--N)、化学耗氧量和主要浮游生物等水质因子进行检测，找出它们的变化规律并比较上述饲料对幼体生长发育、成活率、变态率和育苗效果的影响。

The nitrogen content in the product is affected by temperature, which is unfavorable in carbonthermic reduction and nitridation if it is over or below to 1420℃.

反应温度对产物的氮含量有重要影响，对于碳热还原氮化反应，过低或过高的温度都不利于反应进行，较适宜的温度为1420℃；而铝热还原氮化反应中，升温有利于提高反应速度，较适宜的温度为1460℃。

Based on the study of heat treatment process,the different nitriding effects under conditions of different nitriding methods,temperatures and time are presented.

通过热处理工艺试验研究，比较在不同的氮化温度及时间条件下的氮化效果，制定出适合40CrNiMo材料的合理的氮化工艺参数。

But under the same conditions, the reactions of the complex (41) with organic lithium reagents give a kind of novel complexes in which the nucleophile is added to the a-carbon of the phthalazine ring.

然而含有桥羰基的2，3-二氮杂萘配位的羰基双铁络合物4l在相同的条件下与芳基锂试剂反应时，芳基锂却是亲核加成在氮杂环的α位羰上，生成一类结构独特的双氮双铁羰基络合物。

Result The results indicated that the content of NO in liver, lung and skeletal muscle of high-dose group and in liver of middle dose group were significantly higher than that of control group and low-dose group (P.01). The content of NO in lung and skeletal muscle in middle dose group were higher than that of low-dose group and the control group (P.05). The content of NO in cardiac muscle in control group was higher than that of other group significantly (P.01). Tibetan Saussurea involucrata Kar.

结果］结果表明，高剂量组的肝、肺和骨骼肌和中剂量组的肝中一氧化氮含量中显著高于对照组和低剂量组，差异极显著(P.01)；中剂量组的肺和骨骼肌中一氧化氮含量高于对照和低剂量组，差异显著(P.05)；对照组的心肌中一氧化氮含量高于各药物组，差异极显著(P.01)。

Removal and recovery of nitrogen and phosphorus from wastewater by struvite crystallization,which has the advantages of high removal rate and rapid reaction rate.

采用磷酸铵镁沉淀法处理含氮磷的废水，具有氮磷去除率高，反应速度快的优点；同时，回收氮磷生成的磷酸铵镁是一种缓释肥，具有良好的经济效益。

In general, the distribution of stable carbon and nitrogen isotopes revealed the mixing inputs of terrigenous and marine organic matter controlled the stable carbon and nitrogen isotope compositions in sedimentary organic matter. However, a series of physical, chemical and biogeochemical processes occurring in the local environments had also the significant influence on the stable carbon and nitrogen isotope compositions in organic matter.

研究区域内，稳定碳、氮同位素的地区分布和季节变化特征揭示，有机质中稳定碳、氮同位素组成不仅受陆源和海源有机质输入量之间消长变化的影响，同时一系列的生物地球化学过程、人为有机质的输入和沉积物粒度与叶绿素含量对碳、氮同位素组成均存在一定的改造作用。

In addition, we found that 4-phenyl-l,2,4-triazolinium N-ylides reacted withvarious electron-deficient olefins to afford pyrrole derivatives in good yields via 1,3-dipolar cycloaddition oxidative ring fission, In some cases, tetrahydropyrrolo[1,2-b]triazole and pyrrolo[1,2-b]triazole, which are stable and are not aromatized orcleaved in the reaction conditions, could be isolated, This is a facile and novel route forthe synthesis of pyrrole derivatives.

此外，本文研究了五员三氮杂环化合物4-苯基1，2，4-三氮唑的N-叶立德，发现在氧化剂存在下与缺电子烯烃发生1，3-偶极环加成反应生成的吡咯并[1，2-b]三氮唑，在大多数情况下开环生成吡咯衍生物，反应条件温和，收率良好，是合成吡咯衍生物的一个新的途径。

Compounds 3a-3d, 4a-4d, 5a-5d, 6a-6e and 7a-7e were prepared with a new efficient method, in which the aromatic amines were diazotized with isoamyl nitrite in EtONa/EtOH under refluxing condition, and mono -, bis -and tetrakis -substituted calix [4] arenes were obtained respectively as main product by diazo-coupling in different molar ratio to calix [4] arene.

一，提出了一个有效的新方法合成含有芳香偶氮基团的杯[4]芳烃衍生物3a-3d；4a-4d；5a-5d；6a-6e和7a-7e：即在非水溶剂乙醇中用亚硝酸异戊酯，在强碱乙醇钠存在下对芳香胺进行重氮化，得到芳香重氮酸盐沉淀，过滤，然后加入杯[4]芳烃的四氢呋喃溶液，通入CO〓气体调节溶液的pH值为7-9，使其发生偶联反应。

The changes of nitrogen content, free amino acid, C/N ratio and chlorophyll content of wheat in wheat-faba bean intercropping system were studied by pot experiment with 3 N levels 0, 75 and 150 mg Nkg^(-1 soil. The results showed that leaf nitrogen content of intercropped wheat was higher than that of monocultured wheat at 3N level at tilling and booting stages, but was lower at heading stages.

为了解小麦蚕豆间作系统中小麦氮同化物的变化特征，探讨小麦蚕豆间作提高作物抗病性的可能机制，通过盆栽试验的方法，研究了小麦植株全氮含量、叶片游离氨基酸、叶片C/N比和叶绿素含量的动态变化及供氮水平对其的影响。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。