Nitrogen fixed by legume root nodules accounts for 40% of total biological nitrogen fixation.
豆科植物的根瘤固氮占生物固氮总量的40%。
The nitrogen Deoxo Vessel contains a fixed bed of free copper catalyst which removes oxygen from the nitrogen stream by oxidation of copper to copper oxides.
氮气脱氧罐中装有一个游离铜催化剂的固定床，通过将铜氧化成氧化铜把氧气从氮气中脱除。
Results show that four major influence factors of pulverized coals NO static emission amount are carbon content, fixed carbon content, nitrogen content and ash content respectively.
结果表明：影响煤粉NO静态排放量的四个主要因素依次为：碳含量、固定碳含量、氮含量、灰分含量。
Regulation and the mechanisms of nitrogen form on water utilization of maize under fixed partial root-zone water stress conditions were investigated.
通过研究固定根区水分胁迫下氮形态对玉米水分利用的调节与作用机制，为局部根区灌溉水氮高效利用提供理论依据。
Some of them, such as nitrogen, oxygen, argon, neon, and so on, may be regarded as permanent atmospheric components that remain in fixed proportions to the total gas volume.
其中一些气体，如，氮，氧，氩，氖等，作为空气的永久组成成分，总是以固定的比例存在于大气中。
Biological nitrogen fixation (BNF), which provides all the plants on the globe with 75% of fixed nitrogen, is one of the important projects in life science.
生物固氮为全球的植物提供75%的氮素，是生命科学中的重大课题。
Although there is 34,500 tons of gaseous nitrogen in the air column above each acre of the earth's surface, this cannot be used by plants until it has been fixed by nitrogen-fixing bacteria and algae.
虽然在地球表面每英亩空气柱中有34,500吨气态氮，但是如果这些气态氮不被固氮菌和藻类固定，是不能被植物利用的。
Methods Porous ceramics were used as immobilization carrier. Optimum conditions for nitrate-nitrogen removal of downflow fixed-bed bioreactor were studied.
方法采用多孔陶粒作反硝化细菌固定化载体，研究下流式固定床生物反应器的适宜脱氮条件；
Preserved liver, kidney, pancreas, adipose tissue in liquid nitrogen, and collected the liver, pancreas to 10%neutral formalin-fixed.
留取肝脏、肾脏、胰腺、脂肪组织以液氮保存，并留取肝脏以10%中性福尔马林固定。
Preserved liver, kidney, pancreas, adipose tissue in liquid nitrogen, and collected the liver, pancreas to 10%neutral formalin-fixed.
留取肝脏、肾脏、胰腺、脂肪组织以液氮保存，并留取肝脏以10%中性福尔马林固定。
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