查询词典 nitrogen

A new method of oscillographic titration for the determination of nitrogen content in flour is described The sample was digested with H 2SO 4 Na 2SO 4 CuSO 4 Oscillographic titration is conducted on NH + 4 with Na TPB method,then calculate the nitrogen content Compared with standard methods,this method choose innoxious titrant,has a sharp titration endpoint, needs no distillation absorption and indicator It has the advantages of being easy and quick in operation,and the determination re...

研究了面粉中蛋白质含量的示波滴定法。样品用H2 SO4 Na2 SO4 CuSO4 消化处理，N以NH4 +的形式存在于试液中，用过量四苯硼钠沉淀铵，沉淀过滤，过量的四苯硼钠用氯化四乙基铵标准溶液返滴定，以四苯硼钠切口消失为终点，计算出氮含量，再换算为蛋白质含量。与通用的标准分析方法相比较，本方法所用试剂无毒，终点变化敏锐，不需蒸馏吸收，不外加指示剂，具有操作简便、快速，测定结果准确可靠。

To estimate the quantitative genetic parameters of nitrogen use efficiency, twenty maize single-cross hybrids with varying nitrogen use efficiency were tested at two locations in the North China Plain. At both locations, the hybrids were grown under high (HN, 225 kg/hm^2 N) and low N levels. And no N fertilization on the LN field have lasted two years.

为研究玉米品种氮利用效率相关性状的遗传参数，本试验选择20个具不同氮利用效率的单交种在华北平原的2个地点同期进行试验，氮肥处理设高氮（施氮，折合纯氮225 kg/hm^2）和低氮（不施氮，其地块经过连续2年耕种使氮素耗竭）2个水平。

When the zeolite surface with strained siloxane linkages or with positive and negative charges is expose d to nitrogen at high temperature, partially dissociative adsorption of nitrogen is expected to take place.

当这种带有有张力的硅氧烷鍵或带有正负电荷的沸石表面与氮气在高温下相接触时，氮气就可能发生部分的解吸附。

When the zeolite surface with strained siloxane linkage s or with positive and negative charges is exposed to nitrogen at high temperature, partially dissociative adsorption of nitrogen is expected to take place.

当这种带有有张力的硅氧烷鍵或带有正负电荷的沸石表面与氮气在高温下相接触时，氮气就可能发生部分的解吸附。

Characteristics of nitrogen absorption and response to nitrogen dosage of rice seedlings of 12 rice cultivars selected out through previous field experiments were studied hydroponically.

以大田筛选得到的不同生物学特性的12个水稻品种为材料，研究了水培条件下这些品种苗期的吸N效率差异，结果表明大田N效率不同的品种在苗期水培条件下吸N效率也不相同，并且大田相同类型的品种在苗期N效率也不完全相同。

This product is at the micro-organisms are dormant, to preserve the stability of easily put into the water body, the dormant viable recovery and will soon collapse and the multiplier into a dominant population reproduction, the rapid decomposition of organic pollutants in water, the elimination of amino nitrogen in the water , nitroso nitrogen, hydrogen sulfide and other harmful substances, and single-cell algae into the source of nutrition, the promotion of diatoms, green algae, such as good growth, inhibit the propagation of harmful algae, play a role in the rapid fertilizer, at the same time can increase the dissolved oxygen water, purification at the end of quality, improve water quality.

本品微生物均处于休眠状态，稳定而易保存，投放到水体后，休眠活菌能很快复苏和崩解，并以倍数繁殖成优势种群，迅速分解水体中的有机污染物，消除水中氨基氮、亚硝基氮、硫化氢等有害物质，并将其转化为单细胞藻类的营养源，促进硅藻、绿藻等优良藻类的生长，抑制有害藻类的繁殖，起到迅速肥水的作用，同时能增加水体溶氧，净化底质，改善水质。

Several recoverable processes of nitrogen oxide are compared,The pressor absorption process is selected to treat nitrogen oxide waste gas producing in the industry production of Hexanoic acid and better results have been attained.

比较了几种氧化氮的回收方法，选择了加压吸收方法作为己酸工业产生氧化氮废气的处理方法，取得了较好效果。

The spore germination rate, growth, sporulation and extracellular protease of Beauveria bassiana HFW-05 were investigated with 14 carbon sources and 11 nitrogen sources in media without any carbon and nitrogen nutrition.

在基础培养基中添加14种碳源和11种氮源测定，球孢白僵菌HFW-05菌株的萌发率、生长速率、产孢量及胞外蛋白酶活性。

There the aqueous solution decomposes into ammonia, splitting the nitrogen oxides into nitrogen and water.

有水溶液分解成氨，成氮和水分裂的氮氧化物。

The results show that during the development of the oriental tobacco leaves, the activity of acid invertase was decreased; the changes of GS reached its peak in the 20dans in Samsun, but in the 30dans in Basma and Canik ;the activity of PAL was decreased in the 30dans; The content of total nitrogen was decreased with the mature leaves, but nicotine、total carbon and soluble total sugar were increased. Different varieties, carbon and nitrogen metabolism key enzyme activity and the content of metabolites were different.

结果表明，在香料烟叶片发育过程中，酸性转化酶的活性均呈下降趋势；谷氨酰胺合成酶的活性Samsun品种在20d叶龄时最高，而Basma和Canik在30d叶龄时最高；苯丙氨酸解氨酶的活性均表现为30d时最低；随着叶片成熟总氮含量降低，烟碱含量升高，总碳、可溶性总糖随着叶片成熟其含量呈升高趋势；品种不同，碳氮代谢关键酶的活性及代谢产物的含量变化均有很大差异。

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。