查询词典 thin layer

It,s allelchemicals were isolated through extraction, thin-layer chromatography, and column chromatograpathy. After the white clover was infused in ethanol and evaporation, the leavings was dissolved by water. The aqueous extract was extracted by petroleum,chloroform, ethyl acetate and n-Butanol successively, and the bioassay showed that the chloroform phase has obvious inhibitory effect, the inhibitory rate was 44.32%,88.08% on Abutilon theophrasti M., seedling length and root length, 82.08%,92.16% on Echinochloa crusgalli L., seedling length and root length, and the Amaranthus retroflexux L., germination rate is 0, the secondly was ethyl acetate phase.

运用萃取、薄层层析、柱层析等方法对白三叶草地上部分的化感物质进行初步分离，结果表明，白三叶草经乙醇浸提旋转蒸发后用蒸馏水溶解，依次用石油醚、氯仿、乙酸乙酯、正丁醇萃取，生物测定表明氯仿组分对杂草的抑制作用最强，对苘麻芽长和根长抑制率分别为44.32%、88.08%，对稗草芽长和根长的抑制率分别为82.08%、92.16%，反枝苋的发芽率为0；其次是乙酸乙酯相。

Objective To improve and optimize the method of thin-layer chromatography for the alkaloid determination in radix aconite lateralis praeparata.

目的探讨附子生物碱薄层层析色谱条件的影响因素，完善附子生物碱TLC的检查方法。

Two main bioactive components were isolated by thin layer chromatography, which were all identified as actinomycin.

利用放线菌素类抗生素合成酶保守引物在该菌基因组中扩增到770 bp的相关基因片段。

As the foundation of ultrasonic testing of composite materials, this thesis is intended to explore in detail a number of features of wave propagation in anisotropic plates, and the following essential problems will be considered:(1) Propagation of plane bulk waves in homogeneous and orthotropic anisotropic media;(2) Lamb wave propagation in multilayered anisotropic plates;(3) Influence of isotropic solid or liquid loading on Lamb wave propagation in anisotropic solid media;(4) Influence of interface layers on Lamb wave propagation in layered anisotropic composite laminates;(5) Dispersion characteristic analysis of attenuation Lamb wave while existing an thin viscous layer which is used for simulating the poor curing in adhesively bonded joints.

作为复合材料超声检测的基础，本文研究了如下国际前沿性的课题：（1）平面体波在正交均匀各向异性媒质中的传播；（2）多层各向异性媒质中Lamb波的传播；（3）各向同性固体或液体负载对各向异性固体媒质中Lamb波传播的影响；（4）界面层对层状各向异性复合媒质中Lamb波传播的影响；（5）胶粘剂未固化而呈现粘弹性时粘接结构中衰减Lamb波的频散特性分析。

The result of TLC shows that the three plants of Ajuga contain analogical chemical composition. three plants all contain luteolin.A. decumbens and A.nipponensis all contain esdysterone exclude A.dictyocar. But the latter contained higher amount than the former. TLC of A.dictyocar shows more differences. Thin-layer chromatography can sever as evidence to identificate them.

薄层色谱的结果表明，3种药材的乙醚提取液中均含有木犀草素，且化学成分基本一致；除网果筋骨草外，金疮小草和紫背金盘的正丁醇提取液中均含有蜕皮甾酮，而前者的含量较高，网果筋骨草的色谱与其余二种存在较大差异，薄层色谱法可以鉴别这3种药材。

To determine the product distribution of the reaction mixture, an aliquot will be analyzed by thin-layer chromatography.

为了确定反应混合物中产物的分布，可以对一吸量管的产物进行薄层层析分析。

It is implemented as a thin layer on top of the power-of-two allocator.

它的实现是在2 的乘方分配器上的一个薄层。

On the basis of the simplified differential equations, analytical solution of the radiation damping coefficient for a thin layer is derived, and then a simplified formula taking into account of a number of important influence factors is obtained.

求解了薄层辐射阻尼的解析解，并拟合了包含足够信息同时又便于使用的近似公式。

Consider, for example, Annabella's thoughts as she walks the snow-covered grounds of a country estate, weighing the greater influence that will come to her through marriage to Byron: A layer of white brought out the irregularities in the ground, in the gravel and grass — a thin crust like toast, she thought to herself absurdly, as she stepped upon it.

Annabella走过拜伦在乡间的田产，雪花覆盖在土地上，想着自己与拜伦的婚姻将给自己带来的影响，作者写到，一层白色勾勒出地面崎岖不平的地方，沟渠或者草地，像是烤面包的一层脆皮，她踏上去觉得有些荒唐。

If the gouge layer is thin, contact between asperities on the rock surfaces can occur

如果充填物层很薄，两个岩石表面上的凸起物就有可能互相接触。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。