查询词典 esters

It can reduce the cost of preparation amino acid esters if the methods of preparation can be improved especially using the comparatively inexpensive catalyzers.

如能在制备方法上进行改进，尤其是使用价格相对低廉的催化剂，将会进一步降低氨基酸酯的生产成本。

Modeling functions for seven higher alcohols and six esters in cider were established,which have major and decisive contributions to the flavor of cider.5~# was selected out of eight ciders as the best one by fuzzy comprehensive evaluation methods,and the next best was 6~#.

长期以来，国内外的生产和科研工作者们普遍采用简单根据感官品评的方法去评判苹果酒质量的优劣，由于评酒人员感官上存在一定的生理差别和个人喜好的不同，导致某些酒样的部分重要信息被掩盖[2]。

According to the invention, the natural substances in question are selected from: hydroxy-cinnamic acids and the esters and depsides thereof; plant phenols which can be derived from hydroxy-cinnamic acids; polymers of hydroxy-cinnamic alcohols; other natural substances of plant origin which have anti-mutagenic and aromatising properties and are combined with anti-oxydant vitamins or with the precursors and/or derivatives thereof; and other anti-oxidant vitamins which are made to form complexes with eucaryotic cell cultures.

按照本发明，这些天然物质选自羟基肉桂酸及其酯和缩酚酸、可以由羟基肉桂酸衍生得到的植物酚、羟基肉桂醇的聚合物、具有抗诱变性和芳化性质的并且与维生素合用的其他植物源天然物质、以及与真核细胞培养物络合的其他抗氧化性维生素。

Some organic insecticides are natural, such as rotenone, pyrethrins, and nicotine. Others are synthetic, such as chlorinated hydrocarbons (e.g., DDT, dieldrin, lindane); carbamates, related to urea (e.g., carbaryl, carbofuran); and parathions, organic phosphorus esters.

有机的杀虫剂可能是天然的，如鱼藤酮、除虫菊和尼古丁；或是合成的，如氯代烃类(例如，滴滴涕、狄氏剂、林丹)、氨基甲酸酯，与尿素有关(如氨基甲醯、灭多虫和卡甲喃)、巴拉松、有机磷酸盐。

These include catechin and gallocatechin (hydroxyls at positions 5' as well as at 3' and 4' as in catechin), their esters with gallic acid, catechin gallate, and gallocatechin gallate, and their epimers.

它们有几茶素和儿茶素(在5'位上以及如同儿茶素中一样在3'和4'位上羟基化)，它们与酸生成的酯，即儿茶素酸酯和儿茶素酸酯，以及它们的差向异构体。

How to know exact percentage of esters in 300V50% or 90%?

但要如何知道正确的摩特300V50%~90%吗？

Esters are named as derivatives of the acids from which they are derived.

酯是作为相应的酸的衍生物来命名的。

In addition, these reagents can also used to synthesize various kinds of active esters.

另外，这类试剂也可用于制备各种Na-保护氨基酸的活化酯。

An acid known only in the form of its esters .

一种酸，已知仅以其酯的形式存在。

These compounds are known as esters and some are utilised by the body more quickly than others.

这些化合物被称为酯，有些是利用由机构更快速地比别人。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。