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external nitrogen
相关语句
  外源氮素
     The Study of the Effects of the External Nitrogen on the Contents of Vegetable' s Nitrate
     外源氮素对叶菜硝酸盐含量影响的研究
短句来源
  “external nitrogen”译为未确定词的双语例句
     Under light, the induced activity of GS1 was higher than that of GS2. In external nitrogen-free, the promoted GS2 activity was more than that of GS1. Under the dark, the activities of both GS1 and GS2 were increased by the external nitrogen.
     在无氮下,光对GS2的刺激大于GS1; 在暗处,外源氮对GS1和GS2两者都有诱导作用.
短句来源
     About 599295t plant bioamss was harvested from the lake to remove 1981t nitrogen and 296t phosphorous, equal to 28% of the external nitrogen load to remove 57% of the external Phophorous load of the lake.
     年收获利用水生植物599295t,带走氮1891t,磷296t,相当于东太湖年外源氮、磷输入量的28%和57%;
短句来源
     The activities of GS and its isozymes were influenced by light and external nitrogen besides the development effect.
     除了发育上的变化外,光和外源氮对GS活性及其同工酶影响也是显著的.
短句来源
     Whether external nitrogen exist or not, GS activity was increased gradually in the seed germination and initial stage of cotyledon development and was the highest in 6 d.
     无论外源氮(N)是否存在,GS活性在种子萌芽和子叶生长初期是逐渐升高的,于第6天达到最大,其后活性逐步降低.
短句来源
     The external nitrogen load (including point source and nonpoint source) is an important component of the total water-pollutant load.
     外源氮负荷(分点源和非点源两部分)是水环境污染负荷的重要组成部分。
短句来源
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  相似匹配句对
     The Study of the Effects of the External Nitrogen on the Contents of Vegetable' s Nitrate
     外源氮素对叶菜硝酸盐含量影响的研究
短句来源
     Nitrogen and Magnetism
     氮元素与磁性
短句来源
     Nitrogen Removal without External Carbon Source in SBBR and Its Control
     无外加碳源SBBR脱氮工艺及其控制方法研究
短句来源
     external standad.
     外标法计算含量。
短句来源
     external standard.
     外标法计算含量。
短句来源
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  external nitrogen
The nitriding behavior of nickel-chromium alloys was investigated at 1398 K over the range 1 to 6000 bar of external nitrogen pressure.
      
Conversely, the Si-C-N filament undergoes no strength loss when tested in an atmosphere of nitrogen (P=100 kPa) at 1200°C, the decomposition being impeded by the external nitrogen pressure.
      
External nitrogen availability in autumn is hence highly important for building N reserves in this species.
      
Phytoplankton nitrogen demand and the significance of internal and external nitrogen sources in a large shallow lake (Lake Balat
      
Here we study the pattern of disappearance of Ruppia cirrhosa Petagna (Grande) litter in the field and evaluate several variables that determine the loss rate: external nitrogen and phosphorus availability and activity of detritivores.
      
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Field experiment was conducted to study the nitrogen synthetic metabolism of hybrid rice leaf under various N supply rates,as compared with that of the improved conventional rice varieties. The results obtained showed that in spite of external nitrogen level, the hybrid rice exhibited obviously do-minancy not only in N contents of both the top and the newly full-expanded leaves, but also in soluble protein contents of the leaves at all growth stages tested in comparision with the conventional varieties....

Field experiment was conducted to study the nitrogen synthetic metabolism of hybrid rice leaf under various N supply rates,as compared with that of the improved conventional rice varieties. The results obtained showed that in spite of external nitrogen level, the hybrid rice exhibited obviously do-minancy not only in N contents of both the top and the newly full-expanded leaves, but also in soluble protein contents of the leaves at all growth stages tested in comparision with the conventional varieties. The contents of total chlorophyll and chlorophyll a were found to be much higher in the leaves of the hybrid rice than that of the conventional varieties. It was also showed that the activities of several nitrogen metabolic enzymes of the leaves of the hybrid rice surpassed considerably those of the ordinary rice leaves, including nitrate reductase, glutaminc synthetase, glutamate synthase ( Fd-GOGAT ) , Glu-Pyr transaminas and Glu-OAA transaminase, implying there existed a more active nitrogen assimilation and amino acid synthetic enzymatic system in hybrid rice leaf. Statistic calculation demonstrated that the activities of the five enzymes mentioned above were positively correlated with both the soluble protein contents and the nitrogen concentrations as far as the four rice varieties tested were concerned.

研究结果表明,在分蘖、孕穗和抽穗期,供试杂交稻组合的功能叶片中的氮浓度、可溶性蛋白质和叶绿素含量明显高于常规稻.在其氮素代谢过程中,NR,GS,Fd-GOGAT,GPT和GOT酶活力,在供试品种间的差异是:汕优64>汕优6号>浙丽1号>秀水48,氮素营养条件的变化对此差异无影响,在杂变稻与常规稻之间,Fd-GOGAT酶活力和NR酶活力差异最大(分别达到50~70%和40~70%),而GPT酶活的差异较小.结果还表明,在不同水稻品种的功能叶中,上述5种酶的活力,与叶中可溶性蛋白质含量及全氮量均呈积显著正相关,这说明在杂交稻叶片中,氮素同化和蛋白质合成的酶系统,其活力优于常规稻的该酶系统,它们是杂交稻吸收利用氮素能力强的重要生理基础之一.

In shallow lakes, aquatic plants play very improtant roles in primary production and environmental protection. On the other hand, it can also cause silting-up by adding large amount of plant material to the lake bottom and release pollutant to the lake water when it dies and decnys. The functions of aquatic plants can be regulated reasonably by manipulating the structure and species composition of aquatic vegetation of the lake. In East Taihu Lake, more than 97% of the lake surface was covered by aquatic plants,...

In shallow lakes, aquatic plants play very improtant roles in primary production and environmental protection. On the other hand, it can also cause silting-up by adding large amount of plant material to the lake bottom and release pollutant to the lake water when it dies and decnys. The functions of aquatic plants can be regulated reasonably by manipulating the structure and species composition of aquatic vegetation of the lake. In East Taihu Lake, more than 97% of the lake surface was covered by aquatic plants, which absorbed 3916t nitrogen and 496t phophorous from the lake in a year to produce 1120325t plant biomass (fresh weight). About 599295t plant bioamss was harvested from the lake to remove 1981t nitrogen and 296t phosphorous, equal to 28% of the external nitrogen load to remove 57% of the external Phophorous load of the lake. There was still 521030t plant biomass remained and decayed in the lake which caused serious water pollution and siliting-up of the lake basin. Elndea Nuttallii was introduced to the lake in 1986 and transplanted on a large scale in the past ten years. About 50000ot of Elodea Nuttallii were harvested as fish fodder in 1993. An experiment was carried out successfully to replace Zizania latifolia in the lake with submerged plants. There are still a lot to do to complete the task of reasonable requlation.

水生植物在浅水湖泊中具有净化水质、保护生态环境、生产植物产品等生态功能,同时也有加速湖泊淤浅、引起水质污染等环境负效应,通过对植被结构的调整和利用方式的改进可以优化其生态功能东太湖水生植物覆盖率97%,年生产量1120325t,吸收同化氮3916t,磷486t;年收获利用水生植物599295t,带走氮1891t,磷296t,相当于东太湖年外源氮、磷输入量的28%和57%;但每年仍有521030t的水生植物残留在湖中,引起局部湖区的水质污染和淤积,尤以茭草区最为严重。伊乐藻在东太湖的大面积推广每年可增加水生植物收获利用量约50000t,以沉众植物取代茭草的试验也取得了成功。东太湖水生植被改造工作还有待进一步完善

The variations in surface microstructure of polyimide films were observed under transmission electron micro- scope after the film specimens was injected with the high energy He+ ions of 1.0 MeV ,2.0 Mev and 2.5 MeV, respectively, in the absence of involvement of external nitrogen source and hydrogen source. Through the analyses of micro - area electron diffraction and high - resolution electron microscopy, the phenomenon was discovered for the first time that crystallization at different level occurred...

The variations in surface microstructure of polyimide films were observed under transmission electron micro- scope after the film specimens was injected with the high energy He+ ions of 1.0 MeV ,2.0 Mev and 2.5 MeV, respectively, in the absence of involvement of external nitrogen source and hydrogen source. Through the analyses of micro - area electron diffraction and high - resolution electron microscopy, the phenomenon was discovered for the first time that crystallization at different level occurred in the surface layer of the polyimide films after injecting He+ ions. These observation results demonstrated the formation of diamond - like crystalline and CNx microcrys-talline. The surface hardness, wear resistance and environmental resistance of the polyimide films were improved in case the film specimens were subjected to the bombardment of He+ ion beam with a given energy.

应用透射电子显微镜研究了聚酰亚胺薄膜在无外加氮源、氢源参与的条件下,分别经过1.0,2.0,2.5MeV的He~+注入改性后表面的微观结构变化,通过选区电子衍射和高分辨等手段分析,首次发现在注入He~+后薄膜表层发生了不同程度的晶化,生成了类金刚石晶体和CN_x微晶。经一定能量He~+轰击后的聚酰亚胺薄膜的硬度、耐磨性及抗环境能力得到了提高。

 
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