二肽

It was found that cyclic peptide 23shows higher transport activity for the studied alkali and alkaline-earth metal ions thancompound 24, which is related to the backbone flexibility of the cyclic peptides.

研究了在这两种环肽的存在下，碱金属和碱土金属离子穿越二氯甲烷液膜的过程。

The results show that all the hmgr genes from pigs, cattle and chickens are astable enzyme proteins with the same gene sequence characteristics and encoding protein and physical and chemical properties; all the amino acid sequences have a high degree of homology, containing two conservative HMG-CoA binding motifs and two NADPH binding motifs; all the amino acid sequences, containing signal peptide, are secreted proteins; they are all hydrophobic transmembrane proteins with five transmembrane domains; random coil and α-helix are the main structural elements in the HMGR polypeptide chain; all the predictions of three-dimensional structure are V- shaped; there are more closer evolution relationship between the HMGR gene from pigs and cattle.

结果表明：猪、牛和鸡HMGR基因序列特点及编码蛋白质理化性质基本相同，均属不稳定类酶蛋白；保守结构域氨基酸序列具有高度的同源性，均含有保守的2个β-羟基-β-甲基戊二酸单酰辅酶A结合基序和2个还原性烟酰胺腺嘌呤二核苷酸结合基序；均有信号肽，属分泌型蛋白质；属于跨膜的疏水性蛋白，均有5个跨膜结构域；无规则卷曲和α-螺旋是HMGR多肽链中的主要结构元件；三维结构预测都呈"V"字形；猪和牛HMGR基因的进化关系最近。

Result s:10 μmol/L retinoids could inhibit the Bel-7402 proliferation and decrease the colony forming of liver cancer cells on soft agar significantly.So some biochemical markers indicating the proliferation status of liver cancer cells changed significant ly, including the significant activity increase of ornithine carbamyl transferase, tyrosine-α-ketoglutaric transaminase and alkaline phosphatase, the significant decrease α-fetoprotein secretion,γ-glutamyltranspetidase and aldolase activity.

结果：10μmol/L维甲酸显著抑制肝癌细胞增殖，并使肝癌细胞软琼脂集落形成率明显减少，使代表肝细胞分化的酶鸟氨酸氨基甲酰转移酶、酪氨酸-α-酮戊二酸转氨酶和碱性磷酸酶比活力明显升高，甲胎蛋白分泌量、γ-谷氨酰转肽酶和醛缩酶比活力明显下降。

Any of various natural or synthetic compounds containing two or more amino acids linked by the carboxyl group of one amino acid and the amino group of another.

肽一种自然或人工的合成物，包括二个或二个以上氨基酸，通过一个氨基酸的酸基和另一个的羧基结合而成

Effects of glyoxal on anti-oxidase in rats were studied by observing the activity changes of GSH-Px in blood and tissues after exposure.Glyoxal was instilled through respiratory track.

通过观察乙二醛染毒大鼠血及组织中谷胱甘肽过氧化物酶活力的变化，探讨了乙二醛对抗氧化酶活力的影响。

We have investigated the conformational features of four short peptide fragments of Staphylococcal nuclease by homonuclear two-dimensional NMR and circular dichroism with a view to examining the early events in the folding process of SNase.

本论文工作用四个金黄色葡萄球菌核酸酶N-末端短片段作为新生肽链折叠的模型，用同核二维核磁共振谱和远紫外圆二色谱研究了它们的溶液构象特征。

Determining the dilution enthalpies of DMF and DMA in aqueous glycerol solutions of various molalities, we discussed peptide bond and hydrophobic side chains interacting with glycerol in aqueous solutions. Molecular dynamics simulating ethylene glycol and glycerol solutions have been done to study the microscopic structure of polyhydroxy compounds solutions.

本文用滴定量热法研究了298.15K下酰胺(N—甲基甲酰胺、N，N—二甲基甲酰胺、N—甲基乙酰胺和N，N—二甲基乙酰胺)分别在于MAO水溶液和尿素水溶液中的焓相互作用，探讨了溶剂变化对酰胺侧链相互作用的影响，从肽键及疏水侧链角度研究了TMAO和尿素对蛋白质稳定性的影响。

The technology of separation and purification of the interesting protein was studied, centrifuge the sample and get the clear supernatant, remove protein by 50％ ethanol, concentrate by drying with freezing way, remove salt and pigment by dialysing, separation with G-50 and CM-cellulose52 column, concentrate by PEG6000, The purified sample was a single band after separation by SDS-PAGE.

研究了目的阿片肽的分离纯化工艺。发酵混合物经过离心取上清，乙醇沉淀去蛋白，冷冻干燥浓缩，透析除盐脱色，聚乙二醇6000反渗透浓缩，G-50柱分离，CM-cellulose52阳离子交换层析，聚乙二醇6000浓缩等步骤后得到了较纯的目的产物，目的产物在SDS-PAGE上呈现单一条带。

The complexes areneutral as shown by values of molar conductivity in aqueous solution, namely,〓 The crystal structure determinations show that, in complexes, metal ions werecoordinated by four nitrogen atoms and form slightly distorted square planar configuration,relationship between fluorene ring plane and coordination plane is similar to those betweenpeptide planes of β-folding in proteins. The complex molecules linked by hydrogen bonds formone dimension chain or two dimension network structure.

摩尔电导测定表明他们都是二氧四胺中酰胺氮去质子化后形成的产物。X-射线衍射晶体结构测定表明〓的铜、镍配合物的配位多面体都是稍微畸变的平面正方形，配合物分子中芴基平面与配位平面的关系类似于蛋白质β-折叠结构中肽平面之间的关系，配合物分子之间通过氢键连接成一维链状或二维网状结构。

Peptide nucleic acid is a kind of new nucleic acid mimic invented in the early 1990s', in which the deoxyribose phosphate backbone has been replaced by a pseudo-peptide polymer to which the nucleobases are linked. PNA is uncharged, highly stable in chemical and biological environments, and binds complementary DNA and RNA targets with remarkably high affirnity and specificity.

肽核酸是二十世纪九十年代初合成的一种全新的核酸类似物，它以多肽骨架完全替代DNA中的脱氧核糖磷酸二酯键的骨架，呈电中性，具有极高的生物和化学稳定性、极强的核酸结合能力和特异性，在分子生物学的许多方面得到广泛应用。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。