键连接

蓖麻毒素蛋白来源于蓖麻籽中，由A、B两条肽链通过二硫键连接而成。其中，A链为效应链，具有糖苷酶活性，能使核糖体失活；

Ricin toxin is derived from castor beans and composed of two glycoproteins chains A and chains B linked by a disulfide bond .

Schiff碱稀土配合物以共价键连接方式组装到介孔块体材料的研究

Study on Schiff Base Lanthanide Complexes Covalently Bonded to Meso-structured Silica

并列而排的转移RNA阅读邻近的密码子，带来氨基酸并将其以共价键连接起来。

Juxtaposed tRNAs , reading adjacent codes , bring together amino acids , which are then covalently joined to together .

Ⅱ型RIP是通过二硫键连接的双链蛋白。

And tow-peptide chain protein s , type II RIP .

在弱酸阶段随着甲醛与尿素摩尔比和pH值的下降，通过亚甲基键连接的尿素和高分子质量树脂含量增加，而通过亚甲基醚键连接的尿素的含量下降；

During the weak acid stage , methylene linkages in the polymeric resin increased and dimethylene ether linkages decreased as formaldehyde / urea molar ratio and pH decreased .

经UV、IR和1H-NMR分析可知，三种多糖为β-糖苷键连接的吡喃环多糖。

UV , IR and 1H-NMR analysis , the three fractions of polysaccharide are β - glycosidic linkage of the pyran ring polysaccharide .

环状糊精（cyclodextrin，简称CD）是由D-吡喃葡萄糖基以α-1，4葡萄糖苷键连接成的环状低聚糖。

Cyclodextrin ( CD ) is a kind of ring oligose . It is connected by α - 1,4 glucoside linkage with D - glucopyranose .

研究表明，SSG是一种由β-配糖键连接的葡聚糖。

The SSG was a glucan composed of β - linked D-glucoses .

经13C-NMR分析和比较，表明所得到的聚唾液酸是一种-α2,8糖苷键连接的同聚物。

The polysialic acid in E. coli K-235 was identified as α - 2,8 glycosidic linkage homopolymer of N-acetyl-neuraminic acid .

结构分析的结果表明：PCLA是通过化学键连接到CDA上；

The results of the structure analysis indicated that PCLA was connected to CDA by chemical bonding .

本论文合成了4种含有疏水长链烷烃和亲水醚键连接的噻二唑两亲性TTF衍生物，并用多种手段进行表征，确定其分子结构。

In this paper , four amphiphilic TTF derivatives were synthesized and characterized by kinds of techniques to ensure the molecular structures .

应用键连接矩阵特征根，脂肪醇的沸点（Tb）变化规律分析两个分子结构信息参数EVM和PEI定量关联。

Using the eigenvalues of connecting - orbital matrix , the boiling point ( T_b ) change rule of fatty alcohols were modeled by two descriptors EVM and PEI .

但是F蛋白在获得膜融合活性并使病毒粒子有感染性之前，必需要被细胞内的furin蛋白酶切割成两个二硫键连接的小亚基。

Cleavage of the F protein into two disulfide-linked subunits by a cellular convertase ( furin-like ) is necessary for the low-pH-triggered membrane fusion activity and viral infectivity .

可德胶（Curdlan）是一种由微生物发酵产生的多糖，其线性大分子结构全部由（1→3）-β-D葡萄糖苷键连接而成。

Curdlan is a bacterial polysaccharide formed by fermentation , and its linear structure is composed entirely of ( 1 → 3 ) - β - D glucosidic linkages .

纸层析和红外光谱分析表明，SSG是一种由β－键连接的葡聚糖，其水溶液具有良好的增粘性和假塑性。

Paper chromatography and IR spectrum analysis proved that SSG was a neutral glucan composed of β - linked D-glucose . Its aqueous solution had fine enhanced viscosity and pseudoplasticity .

普鲁兰糖（pullulan）是出芽短梗霉在发酵过程中产生的次级代谢产物，是一种由a.（1.6）糖苷键连接麦芽三糖构成的线性分子，也是一种有广阔用途前景的多聚糖。

Pullulan is a kind of secondary metabolite producing by Aureobasidium pullulans . Pullulan is an unbranched homopolysaccharide which consists of maltotriose units with a - ( 1,6 ) - glucosidic bonds . Pullulan have extensive applying prospect in many fields .

提取发酵液中的聚唾液酸，红外光谱鉴定其纯度，13C核磁共振图谱表明，该多糖是一种α2,8糖苷键连接的唾液酸同聚物。

Analysis of infrared spectra confirmed that the product was identical with that of standard sample . Its purity was up to 98 % . 13 C NMR spectrum showed that this polysaccharide was a 2,8 α linked homopolymer of sialic acid .

海藻糖（Trehalose）是一种以a，a-1，1-糖苷键连接的非还原性双糖，在逆境条件下具有保护生物膜、蛋白质等生物大分子，所以它具有广阔的应用前景。

Trehalose is a nonreducing disaccharide in which two glucose molecules are bonded in an a , a-1,1-glycosidic linkage , has an exceptional capacity for protecting biological membranes and proteins under stress conditions , so it shows a widely using in the future .

其次，通过功能性POSS与热固性树脂的反应，合成出均相杂化树脂，然后再对杂化树脂进行固化，得到无机组分与高分子基体通过化学键连接、均匀分散的有机无机杂化高分子材料。

Secondly , functional octa ( aminosilsesquioxane ) reacted with thermosetting epoxy resin to synthesize uniform hybrid resin , which was cured afterward to obtain organic inorganic polymeric hybrid materials , in which inorganic components bonded covalently with organic matrix and dispersed uniformly .

α-半乳糖苷酶（EC3.2.1.22）和β-半乳糖苷酶（EC3.2.1.23）是自然界中广泛存在的两类糖苷水解酶，能从一系列化合物中释放以α-或β-键连接的D-半乳糖。

α - Galactosidase ( EC3.2.1.22 ) and β - galactosidase ( EC 3.2.1.23 ) are two types of glycoside hydrolases widely existed in nature , which can cleave α - or β - linked galactose residues from a series of compounds .

键连接矩阵特征根与脂肪醇的沸点

Eigenvalue of bonding orbital-connection matrix and boiling point of fatty alcohols

键连接画法及其标准的制订

Drawing technique of key joints and formulation of its standard

这样制备的吸附剂的性质与承载共价键连接鳌合官能团材料的性质相同。

Thus-prepared sorbents possess the properties of materials bearing covalently-bonded chelating functions .

有键连接螺旋桨湿式安装工艺及其应用

Hydraulic fitting technology and its application for keyed propellers

这种分子是由一群化学键连接而成的原子。

A molecule is a group of atoms held together by chemical bonds .

其结构富含精氨酸，并含有二硫键连接和位置保守的半胱氨酸残基。

Its structure contains rich arginine , disulfide bond and conserved cysteine residues .

一个寡糖由2～20个糖单元由糖苷键连接起来。

An oligosaccharide contains 2 to 20 sugar units joined by glycosidic bonds .

结构独特、无键连接、高铬板锤、独特的反击衬板；

Special structure , keyless connection , high-chromium plate hammer , particular impact liner ;

传动齿轮免键连接，保证长期印刷精度。

Transmission gears are joined together with no bonds , which ensures long-term printing precision .

与常规聚合物通过共价键连接不同，这种超分子聚合物单体之间是通过非共价键的连接形成的。

In contrast to conventional polymers , the connection between monomers of supramolecular polymers is noncovalent .