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Third, most magnesium alcoholates are prepared by alcoholysis.The process is based on the exchange of alkoxide groups of a metal alcoholate in the presence of an alcohol other than the alcohol corresponding to the original alkoxide,i.e.on the alcoholysis of a metal alkoxide with a different alcohol. Primary alcoholates can be prepared by this process,such as magnesium di-n-propanolate,magnesium di-n-butanolate,magnesium di-isobutanolate.
该方法适用于较高沸点的伯醇的醇镁化合物,例如正丙醇镁、正丁醇镁、异丁醇镁等,但是用醇解法制备出的叔丁醇镁,其纯度只有80%,这是由于叔丁醇具有较大的空间位阻效应,阻碍了醇交换的进一步进行,并且叔丁醇沸点与甲醇相差不大,使得甲醇难以快速蒸出,只能得到一种混合醇盐产物。
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Third, most magnesium alcoholates are prepared by alcoholysis.The process is based on the exchange of alkoxide groups of a metal alcoholate in the presence of an alcohol other than the alcohol corresponding to the original alkoxide,i.e.on the alcoho- lysis of a metal alkoxide with a different alcohol. Primary alcoholates can be prepare- d by this process,such as magnesium di-n-propanolate,magnesium di-n-butanolate,m- agnesium di-isobutanolate.
该方法适用于较高沸点的伯醇的醇镁化合物,例如正丙醇镁、正丁醇镁、异丁醇镁等,但是用醇解法制备出的叔丁醇镁,其纯度只有80%,这是由于叔丁醇具有较大的空间位阻效应,阻碍了醇交换的进一步进行,并且叔丁醇沸点与甲醇相差不大,使得甲醇难以快速蒸出,只能得到一种混合醇盐产物。
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This report also mentioned Gu Ge, innovate for the most part to its alertly inspiration comes from at common science and technology member, the member that this company encourages these science and technology spends the time of 30% to come conception their new idea.
该份报告也提到了谷歌,注重到其大部门立异灵感来自于通俗的科技员,该公司鼓励这些科技员花30%的时候来构想他们的新点子。
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It can account for many phenomena which expected utility theory has so far failed to explain, such as Allais paradox, Ellsberg paradox, preference reversal, certainty effect, reflection effect, isolation effect, common ratio effect.
后悔理论能够很好地说明期望效用理论所不能解释的Allais悖论、Ellsberg悖论、偏好反转现象、确定性效应、反射效应、分离效应、共同比率效应等异象,而且能够应用于决策理论和资产定价等金融领域。
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Based on the research of modern advertisement design,it was found that the vagueness is permeating in the field of design gradually,and has formed concrete expression techniques,such as allomerism,ambivalent space.
基于对现代广告设计的研究,发现模糊性正逐渐渗透于其中,并不断形成了系列化的模糊性广告设计表现手法:异形同构、异质同形、意的逆反、矛盾空间、虚实相生。
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Based on the research of modem advertisement design, it was found that the vagueness is permeating in the field of design gradually, and has formed concrete expression techniques, such as allomerism, ambivalent space.
基于对现代广告设计的研究,发现模糊性正逐渐渗透于其中,并不断形成了系列化的模糊性广告设计表现手法:异形同构、异质同形、意的逆反、矛盾空间、虚实相生。
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Discussions are given of the fate of Ms2 during translocation in the hexoploid triticale, the exchange of the names for 4A and 4B chromosomes in common wheat and the possible expoitation of the new locus Ms2 (4BS), and the following speculations are made: In geneic genes of allopolyploid organisms the donor chromosomes tend to be intergenomically translocated to their phylogically and evolutionarily close chromosomes with the same order number and the same arm; it is cofirmed that the 7th International Conference of Wheat Genetics was right to exchange the names between chromosomes 4A and 4B of common wheat in 1988; and as a new genetic marker and a breeding tool for all the chromosome B-carrying species in the tribe of Tritceae, Ms2 (4BS) may have wide application in building and expanding the gene pool of germplasm resources of various species of wheat.
对 Ms2基因在六倍体小黑麦与原太谷核不育小麦远缘杂交中易位时的走向,普通小麦4A与4B染色体的互换更名以及 Ms2(4BS)新位点的开发利用进行了讨论:认为异源多倍体生物核基因的组间易位倾向于从供体染色体向进化亲缘关系较密切,且染色体序数与染色体臂相同的部分同源染色体易位;1988年第7届国际小麦遗传学会对普通小麦4A与4B染色体的互换更名是正确的; Ms2(4BS)作为一个新型的遗传标记,作为小麦族内所有携带B染色体组的物种的育种工具和在拓建各类小麦种质资源的基因库等方面均有广泛的用途。
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White phosphorus is a common allotrope of the chemical element phosphorus which has found extensive military application as an incendiary agent, smoke-screening agent, and as an antipersonnel flame compound capable of causing serious burns.
白磷属于磷元素的一种同素异形体,这种化学物质被广泛应用于军事燃烧弹,烟幕弹的制作中,其杀伤性燃烧混合物可以造成严重的烧伤。
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The hydrolysis course of PenG catalyzed by penicillin amidase entrapped in the AOT/isooctane reversed micelles was investigated.
通过将青霉素酰化酶包埋于AOT/异辛烷反胶团中,对PenG酶促水解过程进行了研究。
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This conclusion, combined with the data obtained from the short-lived Hf-W and Sm-N d isotopic systematics, suggests that the Moon was initially accreted at 4.5 Ga, followed by development of the global lunar magma ocean. The primary lunar crust is composed by ferroan anorthosite which was produced by flotation of plagioclase during crystallization of the LMO. However, the mafic minerals, coevally crystallized with the plagioclase, sank to the base of the LMO due to their high density, and made up the main part of the lunar mantle, which served as the source during later mare basaltic magmatism.
根据这一年代资料,结合对月岩样品进行的短半衰期Hf-W与Sm-Nd同位素体系的研究结果,认为月球大致形成于45亿年,其后开始由岩浆海导致的内部核-幔-壳的分异,岩浆结晶的低密度斜长岩构成最初的月壳,而密度大的岩石构成月幔,而此月幔则成为后来月海玄武岩的主要岩浆源区。
- 推荐网络例句
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The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.
此刻阴唇已经几乎完全的缝在一起了,排除多余淤血体液的管子和Foley导管从顶端冒出来。
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To get the business done, I suggest we split the difference in price.
为了做成这笔生意,我建议我们在价格上大家各让一半。
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After an hour and no pup, look for continued contractions and arching of the back with no pup as a sign of trouble.
一个小时后,并没有任何的PUP ,寻找继续收缩和拱的背面没有任何的PUP作为一个注册的麻烦。