查询词典 zwitterionic

Net charge of zero, but the predominant form of alanine at its pI is zwitterionic.

氨酸的等电点pH时，丙氨酸的净电荷为零。净电荷为零的结构有两种，但是主

The crystallization thermodynamic data, such as solubility, metastable zone and other basic data of 6APA were measured based on experiments, which demonstrated that as an ampholyte 6APA can exist in solution as a combination of anionic, zwitterionic and cationic species.

实验数据证明6APA是一种两性化合物，其结构以及溶液行为类似于普通氨基酸，在溶液中以两性离子、正离子以及负离子的形式共存，通过改变溶液的pH值，可以极大地改变6APA的溶解度，这就是6APA等电点沉淀的原理。

Two kinds of water-soluble biomimetic chitosan derivatives with a phosphoramide linkage between glucosamine and choline were prepared through Atherton-Todd reaction under the mild conditions, including zwitterionic phosphorylcholine bound chitosan and acetyl-phosphorylcholine bound chitosan with positive charge. The interaction between chitosan derivatives and calf thymus DNA were inversigated by UV alsorption spectra and circular dichroism spectra.

采用Antherton-Todd反应制备了两种水溶性的磷酰化壳聚糖仿生衍生物：两性的N-磷酸胆碱磷酰化壳聚糖和带正电荷的N-乙基磷酸胆碱磷酰化壳聚糖，并用紫外吸收光谱和圆二色光谱研究了两种胆碱磷酰化壳聚糖衍生物与小牛胸腺DNA的相互作用。

The experimental results show that the transfer volumes for these amino acids from water to sodium acetate, sodium butyrate, sodium caproate, sodium caprylate and guanidium hydrochloride solution are positive and increase with the increasing concentration of denaturant The standard partial molar transfer volume of zwitterionic end group (NH〓, CO0〓) are larger positive values and the corresponding values of methylene group CH〓 are smaller and negative.

实验结果表明，氨基酸从水到乙酸钠、丁酸钠、己酸钠、辛酸钠和盐酸胍水溶液的标准转移偏摩尔体积为正值，且随变性剂浓度的增加而增大；氨基酸的两性端基的标准转移偏摩尔体积为较大的正值，而CH〓基团标准转移偏摩尔体积为较小的负值。

Flavin 2 is most likely present in its zwitterionic form or as its carboxylate ion.

黄素二是目前最有可能在其两性离子的形式或作为其羧酸离子。

Kasper had discovered that two of these eight polysaccharides have a unique zwitterionic structure: the molecules have both positive and negative charges on each repeating unit.

卡斯皮尔发现二这八多聚糖有一个独特的zwitterionic结构：分子有在每个重复的单位的正面和负电荷。

Starting from the hydroxylamine (dimethyl amino ethanol, triethanolamine) and 1, 3-propane sultone, a series of hydroxyl and sulfonyl dual-functionalized zwitterionic salts were synthesized. Then dual-functionalized ionic liquids containing both hydroxyl and sulfonyl functional groups were produced successfully by zwitterionic salts and three kinds of strong acids (p-toluene sulfonic acid, trifluoromethanesulfonic acid, methanesulfonic acid) respectively. The structure of zwitterionic salts and dual-functional ionic liquids were confirmed by the 1H NMR and IR.

以羟基有机胺(N，N-二甲基乙醇胺，三乙醇胺)为原料与1，3-磺酸内酯反应合成了一系列含有羟基和磺酸基双官能团的内盐，并将所得到的内盐分别与三种强酸(对甲苯磺酸，三氟磺酸，甲磺酸)反应，成功地合成了双功能化室温离子液体，并通过红外光谱、核磁氢谱测定，证实了内盐和双功能化离子液体的结构。

While many bacteria are covered in polysaccharides, only a handful of species exhibit zwitterionic polysaccharides.

当许多细菌在多聚糖时被盖，只有几个种类陈列zwitterionic多聚糖。

In mice that were colonized with the mutant bacteria lacking the zwitterionic PSA, CD4 T cell levels were no better than in germ-free mice.

在拓殖与缺乏zwitterionic PSA的突变体细菌的老鼠， CD4 T细胞水平没有好比在无菌的老鼠。

Fragilis 's other zwitterionic polysaccharide, PSB, but had found that its stimulatory effects paled in comparison to PSA.

fragilis's其他zwitterionic多聚糖， PSB，但是发现与PSA比较，它的激动作用变了苍白。

If you are committed to an education career, then the Master of Arts in Education from Ashford University is for you.

如果你是致力于教育事业，那么，艺术教育硕士学位阿什福德大学是给你的。

objective:to explore the expression of survivin protein and its mrna in rectal cancer and their clinic significance.

目的：研究凋亡抑制因子survivin蛋白及其mrna在直肠癌组织中的表达及其与临床病理关系。