查询词典 residues

The amount of pesticide residues was determined by measuring the light absorbency of the sample liquid after inhibition reaction.

研究了吸光度随反应时间的变化关系、温度对酶活性的影响及农药残留浓度与酶抑制率的关系。

Methods: Streptomycin and the derivatization reagent o-phthalaldehyde occur Amine Acetalization generating derivative product with UV absorption and determined the absorbance in special wave length, obtained streptomycin residues in samples then compare with high-performance liquid chromatography.

将试样与衍生化试剂邻苯二甲醛进行胺缩醛反应，即化学衍生处理，生成具有特定波长的紫外吸收的衍生产物，测定其吸光度，求出样品中链霉素残留量，并与高效液相色谱法比较。

Two degrading methamidophos bacteria strains were isolated from the soil, they were identified as Staphylococcus capitis and Alcaligenes faecalis., and named as strain D and strain J.Methamidophos residues in soil were determined by gas chromatography.

从土壤中分离筛选获得两株对甲胺磷农药有较强降解效能的甲胺磷降解细菌，经鉴定分别为头状葡萄球菌和粪产碱菌。

Both the R groups are alkoxy residues.

两个R 基团都是烷氧基。

A peptide antibiotics gene from Amaranthus hypochondriacus, Ah-AMP, was amplified by PCR and cloned. Sequence analysis results revealed that this gene is 261bp in length encoding a precursor polypeptide of 87 amino acid residues.

本文通过PCR技术从苋属植物千穗谷的总DNA中扩增出苋菜多肽抗生素的核基因片段，序列分析结果表明该基因长261bp，编码一个由86个氨基酸组成的Ah-AMP前体多肽。

A method for simultaneous determination of arsanilic, nitarsone and roxarsone residues in foods of animal origin was developed by HPLC-ICP-MS.

建立了动物源性食品中阿散酸、硝苯砷酸和洛克沙砷的HPLC-ICP-MS分析方法。

Several chemical modification agents were applied to investigate amino acid residues in active site of this enzyme and the results demonstrated that histidine, serine, glutamic acid/asparaginic acid are located in the active site.

随后利用不同的化学修饰剂对酶蛋白进行修饰，通过酶催化活力的改变对位于酶活性位的氨基酸残基进行分析，结果表明酶活性位可能含有组氨酸、丝氨酸和谷氨酸。

Analytical results of GC indicated that, to trichlorphon residues in Chinese Cabbage, the extraction rate of subcritical water extraction and microwave assistanted extraction is higher than that of manual shaking extraction and ultrasonic extraction.

气相色谱分析结果表明，对于大白菜中的敌百虫残留农药，亚临界水萃取和微波辅助萃取技术较手动振荡和超声萃取的萃取率更高。

Moreover, the substituents on the bicyclic chromophore can also produce strong van der Waals and hydrophobic interactions with the residues located at the exterior part of the binding pocket.

同时 ，抑制剂双环上的取代基团也能和活性口袋外部的部分残基形成一定的范德华和疏水相互作用。

The tryptophan residues play important roles in DNA photoreactivation catalyzed by CPD photolyases. We have investigated the action mechanism concerning Trp in DNA photoreactivation, and obtained the results as follows: 1 We proposed a mechanism of photosensitized splitting of CPDs by Trp and Trp-containing peptides. 2 Quantum yields of splitting of the model compounds that a Trp linked covalently a CPD were obtained under 290 nm light in various solvents, these values changing with solvent, range from 0.01 to 0.5. 3 Utilizing pulse radiolysis technique, splitting processes were observed in aqueous solution of the CPDs with hydrated electron and some oxidative species (such as hydroxyl radical, bromic radical and azide radical), and obtained their rate constants. In the case of interaction between CPD and hydrated electron, splitting of the CPD anion, and pyrimidine anion transfer an electron to FAD or Rf, were observed. The process rate was slower one order more than that in photolyase. Minor, but highly mutagenic UV-light-induced lesions are (6-4) photoproducts, which are repaired by (6-4) photolyases. These enzymes, discovered in 1993, are not well characterized and their mechanism is still under investigation.

我们研究它的作用机理，获得以下结果：1）建立了色氨酸及其肽对嘧啶二聚体光敏化裂解的直接修复作用机理模型；2）获得了色氨酸共价键连接于嘧啶二聚体的化合物在多种溶剂中290nm光辐照裂解的量子效率，其值随溶剂而变化，范围在0.01-0.5；3）运用脉冲辐解观察到嘧啶二聚体与水合电子和一些氧化性的自由基作用裂解过程，得到相应速率常数；对二聚体与水合电子作用发生裂解以及向FAD返还电子的过程进行了体外模拟；4）（6-4）光解酶的作用机理中一个关键假定是氧杂环丁烷中间体在接受电子后能自发裂解，恢复二嘧啶的结构。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。