There are some disputes about the potential vx . it had not been proved by far that the form of the chiral potential vx that is generally accepted can induce the cholesteric phase 关于v _ x的形式存在争议，并未从理论上证明目前采用的形式一定会导致胆甾相的螺旋性结构。
The microscopic mechanism of the helix structure is one of the most important questions for cholesteric phase , from the general view , which is because there are chiral potential vx 胆甾相理论的一个核心问题是导致其螺旋性结构的微观机制。一般认为这是由于分子之间存在手性作用势v _ x 。
Among general thermochromatic liquid crystals , cholesteryl ester liquid crystals have been used in showing color and displaying temperature due to their easy obtaining , low price and reversible fresh color change 在热色液晶中，胆甾型液晶因原料易得，价格便宜，且颜色变化鲜艳而被广泛使用。
Like other liquid crystals ( lc ) , chorlesteric phase liquid crystal ( clc ) not only owns liquidity , deformability and viscosity of liquid , but also holds the optical anisotropy of crystal 胆甾相液晶同其他液晶态物质一样,既有液体的流动性、形变性、粘性,又具有晶体的光学各向异性,是一种优良的非线性光学材料。
This enzyme is industrially important and useful for the clinical determination of total or free serum cholesterol by coupling with related enzymes , the determination of the steric configuration of 3 3 - hydroxysteroids and the preparation of hormone 胆固醇氧化酶是胆固醇代谢的关键酶之一，它催化胆固醇氧化及异构反应，生成胆甾- 4 -烯- 3 -酮和过氧化氢。
The research results showed that the dmap is an effective catalyst to synthesize cholesteryl ester compounds . in the reactions , improving yield and purity , reducing toxicity as well as simplifying operation process can be carried out 研究结果表明，高效酰化催化剂法是十分有效的酰化方法，在合成胆甾醇酯液晶中可较大幅度地提高产品的产率与纯度、简化操作、降低反应毒性。
At present , the planar structure of clc can be acquired by two methods . one is treating the panel of lc cell by orienting and rubbing , the other is by forming polymer net in the lc . the both method can be used at the same time 目前,胆甾相液晶平面排态的获得主要有两种方法:一是通过对液晶盒的两个基板表面进行取向摩擦;二是通过在胆甾相液晶中形成聚合物网络;当然也有二者兼用的。
Here we show that 27 - hydroxycholesterol ( 27hc ) , an abundant cholesterol metabolite that is elevated with hypercholesterolemia and found in atherosclerotic lesions , is a competitive antagonist of estrogen receptor action in the vasculature 在此我们发现27 -羟基胆甾醇( 27hc )是一种含量丰富的胆固醇代谢产物，它的过量引起高胆固醇血症并存于粥样硬化病变中，在血管中是雌激素受体竞争性拮抗剂。
But there ' s another compound in the blood ? 27 - hydroxycholesterol , or 27hc ? that can also attach to the same receptors but doesn ' t trigger the protective benefits for the heart , according to a study of mice published yesterday in nature medicine 昨天在自然医学杂志上发表的对鼠的一项研究表明血液中存在另一种化合物- 27 -羟基胆甾醇，或27hc -它同样能够和相同的受体结合而不触发对心脏的保护作用。
In this paper , we introduce quantum theory into the liquid crystals in order to research the collective effect ( i . e . the physics effect produced by many - body effect and collective excitation ) . in this way , we research the microscopic theory of nematic phase and cholesteric phase 为了探索其集体效应(多体效应以及集体激发导致的物理效应) ，本文将量子理论引入到液晶体系，研究向列相和胆甾相的微观理论。
