氮

Effects of nitrogen levels on nitrate accumulation, nitrate and potassium uptake of spinach were studied.

研究了不同供氮水平对菠菜硝态氮硝态氮累积与氮、钾吸收的影响。

The optimum hydrolytic conditions of razor clam for neutral protease were : enzyme concentration 2.4%, hydrolysis temperature 50癈, substrate concentration 1:3, pH 7 and reaction time 6 hrs with the degree of hydrolysis and extraction rate of total nitrogen 42.46% and 83.04% respectively; and foracid protease they were: en/yme concentration 6.0%, hydrolysis temperature 50癈, substrate concentration 1:4, pH3.5 and reaction time 5 hrs with the degree of hydrolysis and extraction rate of total nitrogen 46.37% and 87.94% respectively, the hydrolysate being clear light yellow. For the combination of two kinds of proteases they were: first hydrolyzing with 2.6% f 1 avouryme for 3 hrs, then hydrolyzing with 2.4% neutral protease for 3 hrs with the degree of hydrolysis and extraction rtiie of total nitrogen 4-1.57% and 86.95% respectively.

最后综合考虑了水解率、总氮回收率和水解液的色泽、澄清度等指标，得出了较适宜的酶种为单酶以枯草杆菌中性蛋白酶和酸性蛋白酶效果较好，双酶以风味蛋白酶与枯草杆菌中性蛋白酶双酶组合水解效果较好，其适宜的水解工艺条件分别为：枯草杆菌中性蛋白酶加酶量为2.4%，水解温度50℃，料水比1：3，pH值中性条件下水解6h，绕蛙蛋白质的水解率和总氮回收率分别为42.46%和83.04%；酸性蛋白酶水解编蛙肉的适宜的工艺条件为加酶量6.0%、水解温度50℃，料水比l：4，pH值3.5条件下水解sh，水解率为46.37%，总氮回收率为87.94%，水解液呈较清澈的淡黄色；双酶采用先用2.6%风味酶水解3h后，再加入2.4%中性蛋白酶水解3h，水解率达44.57%，总氮回收率为86.95%。

The rate of spatial variability of available N, available K, total N, total P, total K content and pH value in 2007 were all less than 20%, and their area rate of relative uniformity were 100%. The rate of spatial variability of available P and organic matter were large than 20%, and their area rate of relative uniformity were individually 91.34% and 95.70%, which large than 80%.

结果表明，2006年试验地中碱解氮、全氮、全磷、全钾、有机质含量和pH值的空间变异程度都小于20%，相对均匀面积比都为100%，速效磷和速效钾的空间变异程度大于20%，但相对均匀面积比分别为82.18%和94.99%，都大于80%。2007年试验地中碱解氮、速效钾、全氮、全磷、全钾含量和pH值的空间变异程度都小于20%，相对均匀面积比都为100%，速效磷和有机质的空间变异程度大于20%，但相对均匀面积比分别为91.34%和95.70%，都大于80%。

This dissertation is dedicated to investigate the pyrolysis of the fuel-bonded nitrogen model compounds,including five-membered ring nitrogen model compound pyrrole and the substituted six-membered ring nitrogen compound 4-methyl pyridine,with vacuum ultraviolet single-photon ionization combined with molecular beam mass spectrometry technique.

本论文利用同步辐射真空紫外单光子电离、分子束取样和反射式飞行时间质谱相结合的技术研究了含氮杂环模型化合物的热解，包括五元环含氮体系、六元环含氮体系和替代的六元环含氮体系(4-甲基吡啶)。

The experiments of nitrogen form showed that maize seedling treated by ammonia nitrogen (NH42SO4 contained more chlorophyll than that treated by saltpeter nitrogen Ca(NO32,and the statistical analysis was significant.

通过不同形态氮肥试验，表明氨态氮处理的叶片叶绿素含量显著高于硝态氮处理，可能的原因是：(1)氨态氮易于吸收，施用初期效果快；(2)氨态氮中微量元素比较高。

The results of Monte Carlo simulation disclose that in large range of nitrogen fugacity the solubility of the interstitial nitrogen in αFe obeys Sievert's law. This range is much larger than that in γFe-N system. The results also show that in order to get the same level of interstitial nitrogen solubility in αFe-N system during solid state nitride, larger nitrogen fugacity is needed at the lower temperature.

该逸度范围比面心立方结构的Fe-N体系中大得多；由模拟计算结果还可知，在固体渗氮过程中，若要使合金含有同样浓度的固溶氮，渗氮温度较低时应保持较高的氮分压。

When applied -N amount was more than 300Kg/hm2, the contents of some cations, which effect on key enzymes of nitrogen assimilation, was declined significantly, thus, total-N decreased in leaves of swamp cabbage.

华南热带农业大学硕士学位论文 6、施氮量超过300 Kg月加2后，蔬菜叶片中影响氮同化关键酶活性的阳离子含量显著下降，影响了蔬菜对氮的同化，叶片中全氮含量下降。

In order to determine the saturated vapor pressure of colloid ed dinitrogen tetroxide,and find out its change rule with the various temperature,a testing equipment of determining satuated vapor pressure of colloid ed dinitrogen tetroxide was designed and constructed according to the principle of static testing.

为了测定胶体四氧化二氮的饱和蒸气压，找出其在不同温度条件下的变化规律，采用静态法测试原理，自行设计建立了四氧化二氮胶体饱和蒸气压的测试装置，测得了常压下液体和胶体四氧化二氮的饱和蒸气压数据，结果表明，四氧化二氮体系成胶后比成胶前的饱和蒸气压略有降低，且温度越高其差值越大。

At the middle nitrogen level of 90kg/hm~2. All are the highest including seed yield, tillers, fertilie tiler, spkilets/fertilie tiler , florets/spkilet , seeds/spkilet.

在彭水施低氮(纯N60kg/hm~2)比施高氮的种子产量高，在石柱和武隆施高氮比施低氮的种子产量高。

The source and distribution of nitrogen trichloride in chlor-alkali production of Haohua Southwest Chemical Industry Co.

分析了昊华西南化工有限责任公司氯碱生产中三氯化氮的来源和分布，提出预防三氯化氮积聚的方法：加强三氯化氮过程监控和强化预防三氯化氮思想意识。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。