氨基酸中一种可变的化学基团。
由碳和氢组成的一类化学基团。
甲基是一个化学基团。
由氮原子与两个氢原子结合形成的化学基团。
A chemical group comprising nitrogen bound to two hydrogen atoms.
一个碳原子连接到两个氧原子上形成的酸性化学基团。
Acidic chemical group in which a carbon atom is bound to two oxygen atoms.
在生长和发育过程中，基因被化学基团如甲基标记后会不表达。
During growth and development, genes that should not be expressed are physically tagged with chemical groups such as methyl groups.
在电极表面修饰特殊的化学基团，能提高检测灵敏度和选择性。
Modification of specific chemical groups on the electrode surface can improve the detection sensitivity and selectivity.
大多数蛋白质在最初形成之后都会被糖链、脂肪酸或其他化学基团修饰。
After they are initially made, most proteins are modified through the addition of sugar chains, fats or other chemical groups.
FTIR分析表明，改性后的材料化学基团发生变化，引入了含氧极性基团。
SEM picture revealed that treated surface become rough, while FTIR analysis showed that groups of materials were changed in modified chemical with introduction of oxygen-containing polar group.
结果表明，与大分子及填料亲和性好的化学基团的选择及配比是研制均匀-分散剂的关键。
The results showed that choice and compounding ratio of chemical functional group having affinity with polymer and filling was the key to develop the homogenizing-dispersing agent.
甲基，细胞内小的化学基团，定位于DNA链上一定区域，像开关一样，掌管着基因的活化和关闭。
Methyls, small chemical groups within cells, latch on to certain areas along the DNA strand. The methyls serve as a kind of switch that renders genes active or inactive.
叠氮胸苷(azt)缺少可以使DNA继续复制的特殊化学基团(羟基)，这就导致了DNA合成的过早终止。
However, modified AZT molecules lack a specific chemical group (a hydroxyl group) that would allow DNA replication to continue. This results in premature termination of DNA synthesis.
移除的过程将在一定程度上改变电荷，从而使得该蛋白可以摄取其他含磷酸基的化学基团，作为分子桶桥的一部分继续向前移动。
Those removals alter electrical charges in a way that allows the protein to pick up other phosphate-containing chemical groups to pass along as part of a molecular bucket brigade.
同时，上海的研究人员在1973到1975年间着手解析青蒿素的化学结构，他们发现青蒿素具有一个全新且罕见的过氧基团结构。
Meanwhile, researchers working in Shanghai from 1973 to 1975 found that artemisinin has a novel and unusual structure, a so-called peroxide bridge.
R基团赋予氨基酸物理化学特性，例如极性（亲水性和疏水性）以及电荷（酸性或正电荷，碱性或负电荷）。
The R-groups give the amino acids their physical-chemical characteristics such as polarity (hydrophobic or hydrophilic) and charge (acidic or positive versus basic or negative).
相反，表观遗传过程主要是将化学结合到基团或组蛋白，后者是与DNA交织在一起形成染色体，从而激活或关闭基因。
Instead, epigenetic processes attach chemical groups to genes or to histones, proteins that are intertwined with DNA to form chromosomes, to activate genes or to shut them down.
不同类桥联基团根据它们的化学组成能提高玻璃化温度。
Heterogeneous bridging groups can raise the glass temperature according to their chemical composition.
精确地说，因为有孤电子，所以分子中的基团与其他化学物质反应更加容易。
Literally, a radical is a molecule that reacts easily with other chemicals because of an unpaired electron.
炭黑的氧含量、表面酸性含氧基团决定了炭黑的表面化学性质。
The oxide content and surface acidic groups determine the surface chemical property of carbon black.
在重质油加工过程进行的化学反应都视为基团间或基因本身发生的反应。
The chemical reactions in heavy oil processing can be considered as reactions occurred between groups or in the group itself.
化学修饰技术可以掩蔽细胞壁上一些基团，从而使吸附量改变，利用该技术可以探讨生物吸附法去除金属离子的机理。
As the chemical modification can block some groups in biomass cell wall, the metal uptake through biosorption after chemical modification is changed.
利用SBS中丁二烯软段中的双键进行环氧化反应，引入环氧基团进行化学改性。
The double bonds of the butadiene soft matrix in SBS were epoxidized in order to incorprate the epoxy groups and modify chemically.
甲基基团（CH3）附着在SAM中蛋氨酸硫原子具有化学反应性。
The methyl group (CH3) attached to the methionine sulfur atom in SAM is chemically reactive.
介绍了PV B树脂的物性、化学性质、相溶的增塑剂、质量标准、基团间的相互关系等性质。
It introduced PVB colophony's physical and chemical property, dissolvable plasticizer, quality standard and the relationship between chemical groups.
本文在前文的分子模型基础上，提出了似化学局部组成的基团模型，可用于极性分子混合物申组分活度系数的预测。
Based onthe molecular QCLC model, a group contribution quasi-chemical local composition model is proposed, in which polar molecule is divided into several non-polar functional groups.
最新的研究表明：黑碳的表面基团和表面化学性质将极大影响其对污染物的吸附行为。
Recent findings have revealed that the adsorption behavior to contamination will be affected seriously by the surface groups and chemistry properties of black carbon.
这是由于纤维在化学上不活泼，表面能低，表面缺乏极性基团，且是高度对称的亚甲基结构，使得纤维具有很高的结晶度和取向度。
Because the fiber is of chemical inertion, low surface energy, lack of polar groups, and highly symmetric methylene structure, the fiber has a high degree of crystallinity and orientation.
指出，共振核—CF 2—的化学位移不仅受第一、二邻位基团的影响，也受第三邻位的影响。
These results indicated that the chemical shifts of central -cf2 - group are not only affected by the first and the second neighboring groups, but also by the third neighboring group.
双子表面活性剂是一类新型的表面活性剂，其分子由化学键通过联接基团将两个单链表面活性剂的离子头联接构成。
Gemini surfactant is a new type of surfactant, with molecules made up of two amphiphilic moieties covalently connected at the level of the head group by a spacer.
通过化学反应在PP分子结构中引入极性基团是达到PP功能化的根本途径。
Introducing polar group onto molecular structure of PP via chemical reaction is deemed as a primary means for functionalization of PP.
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