在树叶凋落之前，树会分解叶绿素分子，把有用的氮运回树枝中。
Before letting its leaves go, the tree dismantles their chlorophyll molecules and ships their valuable nitrogen back into the twigs.
2005年，“卡西尼”太空探测器飞越土卫二时的勘测资料显示其表面存在碳、氢、氮、氧等元素——这些有机分子被认为是生命形成的必要条件。
Observations from the Cassini probe's 2005 flyby of Enceladus suggest the presence of carbon, hydrogen, nitrogen and oxygen - organic molecules thought to be necessary to develop life.
它最终被证明是，如果我有分子振动，你们知道，空气中有氮和氧。
It turns out that - if I've got molecular vibrations you know, there's nitrogen and oxygen in the air.
腺嘌呤指分子的一部分，即含氮碱基。
Adenine refers to a portion of the molecule, the nitrogenous base.
胺上的氮原子存在着一种电子对，化学家们管这叫孤对电子（译者：嘿嘿~高中知识竟然还未忘记），而正是这些孤对电子把胺分子牢牢绑在纳米管上。
The nitrogen atoms of amines have what chemists call a lone pair of electrons, and it is this which attaches each amine molecule to the nanotube.
在那样的混合体中，氢分子的连接具备了挂钩(hook)的功能，碳原子或氮原子可以抓住这个挂钩，以形成复杂生物分子的起始部分。
Within that mix, the hydrogen atoms form connections that function like hooks, onto which carbon or nitrogen atoms can presumably grab to form the beginnings of complex organic molecules.
其中的一些碳最终以烟雾而非二氧化碳的形式排放出来，而那些本该与碳结合的氧分子则转而与空气中的氮结合。
Some of the carbon therefore ends up as soot, rather than carbon dioxide, and oxygen that should be combining with carbon combines with nitrogen from the air instead.
它主要由电离氢分子和氦构成，同时还包括碳、氧、氮和其他原子，使得其呈现纷繁的混合色彩。
It is mostly made of ionized hydrogen and helium, though carbon, oxygen, nitrogen and other atoms are present, producing the complex color blend visible here.
实质上，每个碳纳米管都是一层碳原子，这层碳原子被涂上了一种叫做胺的含氮分子，随后，将胺涂层朝外，把碳原则层卷成圆柱形，我们就得到了所要的碳纳米管。
Each is, in essence, a layer of carbon atoms that has been coated with nitrogen-containing molecules called amines and rolled into a cylinder with the amines on the outside.
但是，三氧化二氮分子的大小与电特性使它很容易被光线分解成氮和臭氧。
The size and electrical properties of nitrogen trioxide, though, are such that it is easily broken up by light into nitrogen and ozone.
这是氮原子，这是氮原子，然后这是氮气的分子轨道。
Here is the atomic nitrogen, here is the atomic nitrogen and these are the orbitals of molecular nitrogen.
氧气吗当然是多多益善，而三氧化二氮分子在破坏了一系列挥发性有机化合物中的一个分子后也很快就寿终正寝了。这种有机化合物是构成白天烟雾的另一种成分。
The oxygen will bother no one, and the nitrogen trioxide soon meets its end destroying one of a range of volatile organic compounds that are another constituent of daytime smog.
分子中含有两个氮原子和五个氧原子。
One dinitrogen pentoxide molecule contains two nitrogen atoms and five oxygen atoms.
比如，在这下面我写的是氮分子2,而这个是氢分子，但我在上面把这些分子的形式改写了，大家可以看到,这是一个氢与氢之间的单键，含一个氮与氮之间的三键。
So, for example, down here I wrote that it was n 2 and that it was h 2, but when I re-wrote the molecules up here, you saw that it's an h h single bond where it's a nitrogen-nitrogen triple bond.
分子筛床层需要定期用热氮再生。
The molecular sieve bed requires periodic regeneration with hot nitrogen.
但是有一个可能是血液替代品里面的血红蛋白分子夺取氧化一氮分子，这些分子一般发挥舒张血管和组织血小板凝集作用。
But one possibility is that hemoglobin molecules in substitute blood capture nitric oxide molecules that normally dilate blood vessels and keep platelets from getting sticky.
本文采用一种修正的分子连接性指数研究了氮杂环类化合物水溶解度的定量结构性质关系。
This article has presented a modified molecular connectivity indices used in the QSARs research of the aqueous solubilities of heterocyclic nitrogen compounds.
目的：观察脐血间充质干细胞经5-氮杂胞苷诱导在体外定向分化为心肌样细胞的形态学及分子生物学特征。
AIM: To study morphological and molecular biological feature of differentiation of umbilical cord blood stem cells in vitro after induced by 5-azacytidine into cardiomyocytes.
这个分子非常简单，因为我们知道应该把它们放在哪里，甚至不用去想，我们只有一个选择，我们将在碳与氮之间形成一个三键。
This is very easy molecule because we know exactly where to put them without even having to think, we only have one option, and we'll make a triple bond between the carbon and the nitrogen.
不法分子将三聚氰胺添加到原料奶中，钻的是凯氏定氮法测定奶粉蛋白质含量的漏洞。
Melamine lawless elements will be added to the raw milk, the drill is the Kjeldahl method of loopholes in the milk protein content.
通过红外光谱分析了改性多元醇防塌剂的分子结构，证明阳离子化反应引入了正氮基团；
It was proved that the modified PVA has ortho-nitrogen radicals by molecular structure analysis through infrared spectrum.
本文综述离子液体萃取金属离子、有机化合物、 生物分子，脱硫，脱氮及气体分离等的最近研究进展。
This review summarizes applications of ILS in extractions of metal ions, organic compounds, bio-molecules, desulfurization or denitrogenation from fuels and gases and so on.
金是常用的电极材料和SERS基底，而含氮有机杂环分子的表面吸附和反应过程是饶有兴趣的研究体系。
Gold is an ordinary material for electrode and a good SERS substrate, and the study of nitrogen-containing organic molecules on this substrate is an interesting research subject.
低分子量的胺是合成含氮有机化合物的重要原料。
Low molecular weight amines are important raw materials for synthesis of nitrogen_containing organic compounds.
生物胺是一类含氮的脂肪族或杂环类低分子化合物。
Biogenic amine is a kind of low molecular compounds belonging to nitric fatty group or heterocycle group.
生物胺是一类含氮的脂肪族或杂环类低分子化合物，对动植物和微生物活性细胞有重要的生理作用。
Biogenic amine is a kind of low molecular weight compounds containing nitric fatty group or heterocycle group. They have biological importance in vegetable, microbial and animal cells.
制氮设备依靠分子运动理论，由空气中分离富集氮气，中空纤维膜是其关键技术所在。
Nitrogen-production equipment, in accordance with molecule movement theory, is to separate and enrich nitrogen from air, and hollow fiber membrane is the key.
因此实际上我们可以直接进行比较，对氮分子与氢分子的离解能，或键的强度。
So what we can actually directly compare is the dissociation energy or the bond strength of nitrogen versus hydrogen.
用杂化轨道理论和分子轨道理论阐明了氮的氧化物成键类型，给出了分子空间构型及结构数据的解释。
The spatial configurations and bonding effects of Oxides of Nitrogen were explained by using the Valence-shell Electron Repulsion Theory, Hybrid-orbital Theory and Molecular orbital Theory.
氮是生物生存所必需的重要元素，生物中的动植物只能利用化合态氮而不能利用分子态氮。
Nitrogen, the crucial element for the survival of the biology, only can be utilized by the propagation in the compound form instead of molecular form.
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