查询词典 chiral

17 Indicate the chiral C's in camphor Explain why only one racemic form is known.

答：指出樟脑中的手性碳，并说明为什么只能形成一种外消旋体

Resolution of racemic drugs by lipase catalysis offers an excellent technology for the preparation of single-isomer chiral drugs in organic solvent.

在有机相中，脂肪酶催化消旋体的拆分，为制备单异构体手性药物提供了重要的技术手段。

Methods Combined normal silica pressure column with L-aa-OCH3HCl as chiral pool, four racemic mixtures were synthesized and separated.

利用普通的硅胶加压柱联合L-氨基酸甲酯盐酸盐作为手性衍生化试剂将具有同一结构式的4个外消旋混合物进行了分离。

Synthesis and characterization of tridentate chiral ligands, a series of Schiff-bases which are synthesized by salicylaldehyde, 2-pyridinecarboxaldehyde and amino alcohols derived from the amino acids without coordination group on side chain.

由侧链不带配位基团的天然氨基酸合成的氨基醇与水杨醛及2-吡啶醛缩合的Schiff-Base等三齿配体的合成与结构分析。

In terms of their chiral properties and diameters, CNTs can be either metallic or semiconducting.

由于碳纳米管特殊的结构，使其具有许多奇异的物理化学性质，有着广阔的应用前景。

There are very wide smectic C or chiral smectic C liquid crystal phase ranges in the PBM series compounds, but narrow phase ranges in the PMB series where the α-methyl is in the central part of the molecular chain.

甲基联苯酯类液晶是近十年兴起的铁电液晶材料[6] ，由于α甲基的位阻作用，使这类液晶材料不仅具有较低温度的手性近晶相态，而且在液晶相态时分子旋转粘度小，响

The liquid crystal display has a chiral ferroelectric smectic liquid crystal between two transparent plates with electrodes for generating an electric field, and polarisers in front of and behind the liquid crystal, the ratio d/p of the thickness d of the liquid crystal layer to the pitch p of the helical twisting being larger than 5, the smectic tilt angle theta 0 being between 22.5 DEG and 50 DEG , and the product d.

一种液晶显示单元，它具有：一种在两块透明平板之间的手性铁电近晶液晶；用于产生电场的电极；在液晶前后各有一偏振片，液晶层的厚度d与螺距扭曲的螺距高度p的比值d／p大于5，近晶倾角θ 0 为22.5～50°，厚度d、倾角θ 0 的平方、双折射率△n和光波长λ倒数的乘积dθ 2 0 △n1/λ大于0.45μm。

The development and the mechanism of stereochemical resolution of racemates, in HPLC, using a chiral stationary phase based upon immobilized enzymes ,was reviewed with 22 references.

综述了用固定化酶为高效液相色谱的固定相拆分手性物质的发展和机理，参考文献22篇。

The stereochemical studies of PPCs derived from the copolymerization of CO_2 with chiral PO at various conditions reveal that the polymer enantioselectivity is proportional to its head-to-tail linkages with regard to regioselective ring-opening of the epoxide.

通过研究聚碳酸酯的立体化学发现聚合物的对映体选择性与环氧丙烷区域选择性开环存在一定的影响作用。

The stereochemical effect of the chiral amino acid residues on the formation of penta-coordinate phosphorus intermolecular mixed carboxylic-phosphoric anhydride from N-phosphorylamino acids was studied with density functional theory calculations at B3LYP/6-311G level.

用密度泛函方法在B3LYP/6-311G水平上对N-磷酰化氨基酸生成五配位磷酸羧酸混酐反应中手性氨基酸残基侧链的立体化学效应进行了研究。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了