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In chapter 2, concerning the chemistry of many kinds of olefin-coordinated alkoxycarbene iron complexes and their isomerized products previously synthesized by our group, we examined their thermolysis reactions and many novel thermolysis products were isolated.

第二章中,对于我们小组以往合成的各类烯烃配位的铁卡宾络合物及其异构化产物,为了研究其反应性能,我们从热解反应着手,研究了一系列烯烃配位的铁卡宾络合物及其异构化产物的热解反应,获得了一系列新奇的热解产物。

In order to obtain a highly efficient GPX mimic, we propose that enzyme model must recognize and bind GSH, and that Sec is at an appropriate position to interact with the thiol of GSH.

基于GPX的酶学特点,我们认为:为了获得高催化效率的GPX模拟物,其关键在于酶模型对底物GSH的识别和结合,催化官能团的合适放置。

It includes the following steps: extract trivalent iron ion and divalent iron ion in water phase through organic extractant, get predecessor of; absterge it with secondary distilled water for2-3 times and get pure load metal predecessor of organic phase; mix organic phase of Mg2 and Fe3 with mol rate of 1:2 and introduce them into autoclave, add distilled water according to the rate of 3:1 or 4:1 of organic phase and water phase and airproof it, and then mix it fiercely, stripping with hydrothermal method at temperature between 200 degree C and 300 degree C and make them react for 2.5 hours; cool it to the room temperature under natural condition, separate liquid and centrifugalize it, absterge it with absolute alcohol for 2-3 times and dry it at temperature of 50 degree C for 30-180 minutes, then get product of magnesium ferrite.

包括如下步骤:通过有机萃取剂来萃取水相中的三价铁离子和二价镁离子,制得有机相前驱物;用二次蒸馏水洗涤2-3次,获得纯净的负载金属有机相前驱物;按照Mg 2 和Fe 3 摩尔比1∶2将有机相混合均匀后引入高压釜中,按照有机相与水相的比例为3∶1或4∶1加入蒸馏水,密封后,对溶液进行强力搅拌,水热反萃的温度在200-300℃之间反应2.5小时;自然冷却至室温,分液,离心分离,用无水乙醇洗涤2-3次,在50℃下干燥30-180分钟,得铁酸镁产品。

The total RNA was abstracted from the larvae of Boophilus microplus, and a 1982bp Bm86 gene was amplified by RT-PCR. The target gene was subcloned into T vector. The sequencing showed that the nucleotide sequence of the cloned Bm86 gene shared 97.4% homology with the data published in and this fragment contained the complete open reading frame of Bm86 gene.

为了克隆微小牛蜱Bm86 基因及构建该基因的表达载体,以微小牛蜱饥饿幼蜱的破解物提取的总RNA为模板,参照已发表的微小牛蜱Bm86基因的核苷酸序列,设计了1对引物,采用RT-PCR技术获得微小牛蜱Bm86基因;将Bm86基因克隆入载体,并进行序列分析,结果证明,克隆的Bm86基因序列与GenBank上登录的Bm86基因序列的同源性达97.4%,而且该序列包含完整的开放阅读框。

In order to mimic this repair process of apoenzyme, we synthesized two model compounds, in which tryptophan and/or tyrosine was covalently linked to cyclobutane thymine dimer, and measured the splitting quantum yield of dimer under 295 nm light. By investigating the photosensitized splitting properties of the dimer, some new insights into the intramolecular electron-transfer process were gained.

为了模拟酶蛋白的这一修复过程,合成了色氨酸和/或酪氨酸与胸腺嘧啶二聚体共价连接的化合物,作为酶-底物复合物的模型,研究了它们在295 nm光照射下氨基酸残基光敏化二聚体裂解的性质,测定了二聚体裂解量子产率,获得一些新的结果并对其进行了分析。

This detailed view of diagenetic processes in continental shelf sediments suggests that studies of geomagnetic field behavior from such sediments should be conducted with care.

这种陆架沉积物详尽的成岩过程表明,从这些沉积物中获得的地球磁场变化结论应当谨慎地加以对待。

The photopolymerization led to stable latices and they were obtained with neither coagulation during synthesis nor destabilization over time. It was found that the obtained MMA homopolymers exhibited relatively narrow molecular weight distributions(PDI=1.27—1.36), which was characterized by GPC. The plots of number-average molecular weight vs. conversion and ln([M0]/) vs. time were linear respectively, indicating that the reaction was a controlled/living free radical polymerization.

结果表明,该细乳液体系非常稳定,在整个聚合过程中即没有絮凝物产生,也没有沉淀析出,获得了良好的ln([M0]/)与时间、数均分子量与转化率之间的线性动力学关系,并且在整个聚合反应过程中MMA均聚物的分子量分布比较窄,其多分散性指数较低(PDI=1.27~1.36),具有明显的活性聚合特征。

It was found that manganese porphyrins linked with stable nitroxyl radials could oxidize sulfides using NaOCl as the oxidant to give the corresponding sulfoxides in good to excellent yields (80-97%) with high chemoselectivity and diasteroselectivity (dr≥7:1 for glycosyl sulfoxides).

发现连有稳定氮氧自由基的卟啉锰络合物对NaOCl选择性氧化各种硫醚底物有较好的催化效果,获得了高的产率(80%~97%)、化学选择性和非对映选择性(糖基亚砜非对映异构体的比例大于7:1)。

Of a work (and of a contained name and nomenclatural act): the date on which copies of the work become available by purchase or free distribution.

一著作物(以及所包含的名称和命名举动):可购得或由免费散发而获得该著作物的复本的日期。

Separation of complexes of different pheophytins with the same rare earth ion was firstly accomplished by reversed-phase HPLC, but the attempt of separation of complexes of pheophytin with different rare earth ions was unsuccessful.

首次实现了对同一稀土不同叶绿素配体所形成的配合物之间的色谱分离,然而不同稀土同一叶绿素配体所形成的配合物之间的分离尝试未获得成功。

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I didn't watch TV last night, because it .

昨晚我没有看电视,因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来,在北京的很多小区里,电梯液晶电视被撤了下来。

I'm running my simile to an extreme.

我比喻得过头了。