查询词典 nitrogen

Using field experiment and chemical analysis,the yield and nitrate content of various organ in tumorous stem mustard under different forms of nitrogen and different nitrogen levels were studied.

采用田间试验和化验分析等方法，研究了不同形态氮、不同氮水平下，茎瘤芥各器官产量和硝酸盐含量的变化特征。

Compared to the other carbon and nitrogen sources studied, sucrose and malt extract were found to be the suitable carbon/nitrogen sources. The decolorization efficiency of Cerrena unicolor Y5002 to orange G was similar at different orange G concentration below 500mg/L; however, alizarin red inhibited the decolorization reaction at the concentration of 400mg/L or above 400mg/L.

对一色齿毛菌Cerrena unicolor Y5002的液体培养脱色条件进行了研究，其最适碳源和氮源分别为蔗糖和麦芽浸粉；在不同橙黄G浓度下均获得较高的脱色率，因此浓度为500mg/L的橙黄G未对该菌的脱色能力产生抑制作用，而浓度为400mg/L茜素红则对其脱色作用产生明显抑制。

The Simpson and Shannon-Weiner indices of aquatic plant diversity were both significantly positively correlated with catalase, protease and invertase, and negatively correlated with urase, soil organic matter and total nitrogen. Similarly, soil organic matter and total nitrogen were negatively correlated with catalase, protease and invertase but positively correlated with urase.

植物α多样性指数(辛普森、香浓-维纳指数)与湿地土壤有机质、全氮含量呈负相关，与土壤过氧化氢酶、蛋白酶、蔗糖酶活性呈正相关，与脲酶活性呈负相关；土壤有机质、全氮含量与过氧化氢酶、蛋白酶、蔗糖酶活性呈一致负相关，与脲酶活性则成正相关。

A series of nitrogen fixation characteristics, such as nodule nitrogen fixation activity, nodule ureide content and young stem ureide content were studied in the same latitude and differently evolutionary types of soybean.

本试验研究了中国同一纬度不同进化类型大豆主要生育时期的根瘤固氮酶活性、根瘤酰脲含量和幼茎段酰脲含量。

For example, one volume of liquid nitrogen at atmospheric pressure vaporize s to 694 volumes of nitrogen gas at 68 F (20 C).

例如，一个大气压下的单位体积的液态氮在68°F(20°C)时蒸发成694个单位体积的氮气。

This paper summarized literature about the structure, adsorption dynamics and thermodynamics, modification of zeolite and its application in wastewater treatment. Based on them, the conditions of zeolite modifying by AlCl_3 was explored, the adsorption properties natural zeolite to ammonia nitrogen and adsorption effects of aluminum modified zeolite to phosphor in solution was researched, the existing form of ammonia nitrogen was investigated by cyclic voltammeter.

本文在对沸石的结构、沸石吸附动力学、热力学、沸石改性及其在废水处理中的应用等相关文献综述的基础上，探索了用AlCl_3溶液改性天然沸石的条件，考察了天然沸石和铝改性沸石对溶液中氨氮的吸附性能以及对溶液中总磷的吸附效果，以及用循环伏安法探讨了水体中氨氮的存在形式。

Results indicated that both the amount of bacteria, epiphyte and actionmyces sharply and the amounts of acarina, collembolan and nematode were increased by application of organic fertilizer and the combined application of inorganic fertilizer with organic fertilizer for a longtime. Soil animal collembolan and nematode were significantly related to soil organic material and available phosphorous and available nitrogen. Acarina was significantly related to soil organic phosphorous, available potassium and available nitrogen.

结果表明：长期单施有机肥及其配施无机化肥，能显著增加土壤细菌、真菌和放线菌的数量，明显提高土壤动物蜱螨类、弹尾类、线虫类的数量，土壤动物弹尾类、线虫类与土壤有机质、有效磷、碱解氮呈极显著正相关；蜱螨类与土壤有机磷、速效钾呈极显著正相关；与土壤碱解氮呈显著正相关。

48 rice genotypes were used for researching nitrogen absorption and utilization efficiency, and the relationship between nitrogen utilization efficiency and main agronomical characteristics.

以48份不同水稻基因型为供试材料，研究了它们的氮素吸收和利用率，及其与主要农艺性状之间的关系。

The invention concerns a process for preparing heterocyclic carbenes of general formula in which R1, R2, R3 and R4 are identical or different and mean saturated or unsaturated, straight-chain, branched or cyclic, unsubstituted or substituted C1-C10 alkyl, C2-C5 alkylidene, C2-C5 alkylidine, C7-C19 aralkyl or C6-C14 alkyl groups, R3 and R4 can also stand for hydrogen or form jointly anellated, substituted or unsubstituted groups with between 3 and 7 carbon atoms and X stands for carbon or nitrogen, R3 being dropped if X is nitrogen.

本发明涉及一种制备通式Ⅰ的杂环碳烯的方法，其中在通式Ⅰ中，R1、R2、R3和R4是相同的或不同的，并且是饱和的或不饱和的，直链、支链或环状的，未取代或取代的C1－C10－烷基、C2－C5－亚烷基、C2－C5－次烷基、C7－C19－芳烷基或C6－C14－芳基基团，R3和R4可以是氢或它们一起形成具有3－7个碳原子的稠合的、取代或未取代的基团，X是碳或氮，并且当X是氮时，不存在R3。

Removal of high concentration of ammoniacal nitrogen discharged in rare earth production process by VMD is basically studied in this paper, and VMD can achieve the purpose of ammoniacal nitrogen removal and reuse of recovered ammonia at the same time.

进行了减压膜蒸馏法处理含高浓度氨氮的稀土冶金所排废水的基础研究，该法可达到脱除废水中高浓度氨氮及回收氨回用于生产过程的目的。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。