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We transformed RMgBr into R-Ti derivatives with the production of byproduct MgBrO~(i-Pr at the same time, but we didn\'t need romove the Mg salt by centrifugation or chelating reagents, for bis[2-(N,N-dimethylamino)ethyl] ether could chelate with Mg atom and thereby reduced the Louis acidity of Mg salt, so we used R-Ti derivatives produced in situ to alkylate the aldehydes induced by BINOL-Ti complexes..
我们通过利用TiO~(i-Pr_4使格氏试剂转化成烷基钛，同时产生具有亲核加成促进作用的副产物MgBrO~(i-Pr，由于BDMAEE能与MgBrO~(i--Pr络合降低其路易酸活性，所以不需要离心或者借助络合试剂完全除去镁盐，而使用原位生成的烷基钛在BINOL-Ti诱导下对醛进行不对称加成。
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There are a lot of the maidenhair trees in our living block, and along the both sides of the street, as well as there are several pieces of it in the right side park. All of these trees are fruited, now the maidenhairs are riped, when the wide blowing, the riped fruits fall on the ground, covered over some of the land. The riped maidenhair's peel is yellow, its pulp is smally, wipe of the pulp, left the core, that is what we say for gingkgo fruit. In China,this fruit was one of the tributes to the emperor in the Song dynasty. The fruit has rich of Vitamings, for fooding, it can cure some lung , asthma diseases, and with anti-aged function.
我们住的这个街区银杏树不少，行道树也栽的有银杏树，我们住的右边那个公园有好几棵银杏树，都结满了果实，现在银杏果成熟了，风一刮，那果子就落下地了，地上落了一层，成熟银杏的果皮是黄色，果肉很臭很臭，要除去果肉剩下果核，就是我们说的可吃的银杏果，银杏在我国宋代就被列为皇家贡品，银杏果富含多种维生素，食用具有敛肺气、治哮喘、抗衰老等功效。
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The key observation was made by Cech in 1982 when he was trying to understand how introns were removed from mRNA that coded for ribosomal RNA in the eukaryotic protozoan Tetrahymena.
Cech在1982年进行了一次关键的研究。当时他是想了解在真核原生动物四膜虫中，内含子是怎样从编码rRNA的mRNA上除去的。
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amino peptidase：氨肽酶
在原核及真核细胞中fMet或者Met一般都要被除去,此是由氨肽酶(amino peptidase)水解来完成的(图15-12). 水解的过程有时发生肽链合成的过程中,...
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ribozyme：核酶
3.5 催化作用 近几年来发现某些RNA具有酶的催化功能,这类具有酶活性的RNACech将它命名为"核酶"(ribozyme). 最早发现某些低等真核生物的细胞核rRNA前体及线粒体mRNA前体和rRNA前体在除去自身居间顺序(IVS)时是自我催化进行的.