外消旋的

The appearance of-enantiomer after incubation with single-enantiomer revealed the enantiomeric inversion of-isomer to its antipode. While no obvious stereoselective degradation or enantiomeric inversion were observed in other test soils.

左右旋对映体在3~#土壤中的降解速率有明显差异，二者半衰期相差0.95周；添加外消旋体培养6周后ER值达到1.65，表明左旋体被优先降解；同时在该土壤中存在左旋体向右旋体的转化现象；在其他几个土壤中均未有明显的选择性降解或对映体转化现象。

Other plants such as gingergrass produce racemic carvone. Nature goes one step further; some botanically indistinguishable plants grown in different countries can carry out complete metabolic sequences of mirror-image

其他的植物如姜草会产生外消旋的香芹酮，自然发展更进一步：一些在植物学上不可区别的植物在不同的国家都有生长，它们可以进行一系列完整的与新陈代谢有关的镜像反应。

In the case of substances known to undergo racemization or mutarotation, care should be taken to standardize the time between adding the solute to the Solvent and introduction of the solution into the polarimeter tube.

对于检测已知具有外消旋或变旋作用的物质，应当小心地采取措施对向溶剂中加入溶质和将溶液加入旋光计管道的间隔时间进行标准化。

Results indicated that the-enantiomer showed significantly higher activity on cucumber and sorghum fresh weight inhibition than that of the-enantiomer, and also higher than that of the racemate at the same rate.

结果表明，单一左右旋对映体和等量的外消旋处理的高梁和黄瓜鲜重抑制作用差异显著，右旋体活性明显高于左旋体，也明显高于等量的外消旋体。

In this thesis, a totally new type of chiral heteropolyanion, [Sb_5_(10)Mo_5O_(26)]~(7-), has been isolated as racemic compound 1. The racemate was further resolved into enantiomerically pure crystals L-2 and R-2 by addition of organic units.

本文我们得到了一个由新的手性多阴离子[Sb_5_(10)Mo_5O_(26)]~(7-)构筑的外消旋体1，通过向外消旋体1的溶液中加入有机基团，实现了对外消旋体1的拆分得到了纯旋光活性化合物2，即L-2和R-2。

Its dextrorotatory substant is an antidepressant which does not have the helminthic effect.

所不同的是四咪唑为外消旋体，左旋咪唑是四咪唑经过化学方法处理后拆分而成的左旋体。

Notably, compounds 12–14 can be described as a 3D open–framework with nano–channels, compound 15 can be described as a 3D open–framework with double helical channels, while compound 16 can be described as a 3D heterochiral coordination polymer with double helical channels, which can be obtained by spontaneous resolution from the racemic phosphonic acid.X–ray powder diffraction analysis shows that compound 16 is a pure phase. Surface photovoltage spectroscopy of compound 16 indicates that it possesses positive SPV response in the range of 300–600 nm and shows p–type semiconductor characteristic.

值得注意的是，化合物12-14为具有一维纳米孔道结构的三维开放骨架结构，化合物15是具有双螺旋孔道的三维开放骨架结构，而化合物16是外消旋的有机膦酸配体通过自发拆分而形成的具有双螺旋孔道的多手性三维开放骨架结构。X-射线粉末衍射分析表明化合物16为纯相；化合物16的表面光电压光谱分析中，在300-600nm范围内有3个正的光(来源：ABC论文12网www.abclunwen.com)伏响应带，表明它具有p型半导体的特征；化合物16的诱导表面光电压谱进一步确定它的p型半导体的特征；磁性研究表明，化合物16中两Mn原子之间存在弱的反铁磁相互作用。

Based on their distinctive optical properties, a method of determining the specific rotation was set up to distinguish these two kinds of chemical materials in the standard for detection of levogyrate preparati.

二者的差别在于盐酸噻咪唑为外消旋体，盐酸左旋咪唑为左旋体，通过利用两种物质的光学特性，在盐酸左旋咪唑制剂的检测标准中设立比旋度测定方法，从而将两种不同的物质加以区

Adjacent helical chains are racemic. The Ag atom is linked to two nitrogen atoms of the 2-pyridyl and 4'-pyridyl groups from two different 2,4'-bpy ligands as well as to the oxygen atom of the counterion. In 17 and 19, the adjacent helical chains are linked to wavy two-dimensional network structures by the nitrate counterions.

相邻的螺旋链间是外消旋的，Ag 原子与分别来自两个不同2，4'-联吡啶的2-吡啶基和4'-吡啶基的氮原子以及阴离子的氧原子配位，在配合物17和19中，相邻聚合螺旋链被硝酸根离子桥连接起来，变成了一个波浪形的二维网络结构；配合物18是首次通过无桥连配体支持的Ag ××× Ag键将相邻螺旋链连接成二维非穿插的网络结构。

Some compounds possessing chiral center themselves may be racemates and appear racemic phenomenon in the extraction and separation from medicine herbs, structure modification and chemical synthesis.

但是，由于含有手性中心的中药有效成分本身可能是消旋体、或者在分离提取、结构改造及化学合成时会出现外消旋化现象，使新药研制与开发中面临对映体成分的分离制备、体内手性药物分析及对映体特异性药代动力学研究等重大难题。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。