三羟的

Methods Based on the sugar analysis of 10 tea polysaccharides, the mix of arabinose:galactose:glucose (1:1:0.5, mol ratio), which was the major sugar composition in tea polysaccharides, were applied to investigate the influence of sugar on the carbazole method and meta-hydroxydiphenyl method respectively.

采用气相色谱法分析了10种茶多糖样品单糖组成，考察了其主要的三种单糖组分组成的混合中性糖（1：1：0.5，摩尔比）对硫酸咔唑法、间羟联苯法两种方法测定糖醛酸含量的影响。

In this paper, three kinds of hydroxyl component are prepared for two-component waterborne polyurethane paint, that is, acrylic dispersion, acrylic emulsion and silicone-modified acrylic emulsion. The influence of the composites of these dispersion and emulsions on polymerization process, viscosity, particle size and coagulum are investigated, infrared spectroscopy , inductance coupling plasma , transmission electron microscopy and thermogravimetric analysis are used to characterized their structure, composite, morphology and thermal stability, respectively.

本论文制备了三种用于水性双组分聚氨酯涂料的含羟基组分，即丙烯酸分散体、丙烯酸乳液和有机硅改性丙烯酸乳液，研究了这些分散体和乳液在制备过程中聚合物的羟值、酸值、玻璃化温度、乳化剂、反应温度等对聚合转化率、凝聚物含量、聚合物粘度和粒径的影响，用红外光谱、热重分析、透射电镜和感应偶合等离子技术表征了其结构、组成、形态和热稳定性。

Hydroxybutyraldehyde, which is main material of synthesizing 3-hydroxybutyric acid was prepared through the aldol condensation of acetaldehyde in this paper. The properly reaction conditions of acetaldehyde condensation and paraldehyde depolymerization was studied and obtained.

本文自行制备了氧化反应的主要原料3-羟基丁醛，并对乙醛羟醛缩合反应及三聚乙醛的解聚反应进行了初步研究，确定了反应的最佳条件。

For the study, the researchers asked participants about their diet and estimated consumption of three flaonols: quercetin, which is most abundant in onions and apples; kaempferol, found in spinach and some cabbages; and myricetin, found mostly in red onions and berries. Oer the next eight years, 529 deeloped pancreatic cancer.

研究人员询问参与者有关他们的饮食，并估算吃三种黄酮醇的量：五羟黄酮，在葱和苹果中含量最多；山奈醇，存在菠菜和一些甘蓝菜中；杨梅黄酮，主要存在于红洋葱和莓果中，在之后八年内有529人罹患胰脏癌。

The sinapate esters have greater UV-B attenuation and antioxidant activity than flavonoids.

拟南芥苗中还含有高浓度的黄酮和较高比例的五羟黄酮及4，5，7-三羟基黄酮衍生物。

As the paper industry,important addition agents,3-chloro-2-hydroxypropyl trimethyl ammonium chloride was useful the activity intermediates.

3-氯-2-羟丙基三甲基氯化铵可作为造纸工业中的重要助剂，是有用的活性中间体。

In Chapter 3, single molecule and their aggregate behavior of hydroxypropyl cellulose were studied by AFM and Laser Light Scatting methods.

第三章中，利用AFM和激光光散射研究了羟丙基纤维素的单分子结构及相互聚集的行为。

Methods The pyrogllol auto-oxidation was adopted to produce superoxide anion O(superscript - subscript 2; the system H2O2/Fe(superscript 2+) was used to produce hydroxy radical through Fenton reaction; and spectrophotometry was used to detect the clearing functions of drugs with different concentrations against O(superscript - subscript 2) and OH.

采用邻苯三酚自氧化法产生超氧阴离子自由基O(上标-下标 2，采用H2O2/Fe(上标 2+)体系通过Fenton反应产生羟自由基，用分光光度法分别测定不同浓度的药物对O(上标-下标 2)是和OH的清除作用。

In the range of test concentration, the maximum scavenging or inhibition rate of apple polyphenol extracts to linoleic acid auto-oxidation, nitroso, hydroxyl radical generated by Fenton reaction, superoxide anion radical generated by illuminating riboflavin and pyrogallol auto-oxidation was 94.4%, 95.76%, 96.64%, 95.19% and 90.48% respectively.

在试验浓度范围内，其对亚油酸自氧化、NO_2~-、Fenton反应产生的羟自由基及光照核黄素和邻苯三酚自氧化产生的O？

Two types of three-arm or four-arm star-shaped hydroxy-terminated PCL weresynthesized via the ring-opening polymerization of CL with multifunctional initiator and 〓catalyst.

以多元醇(季戊四醇或2，2-羟甲基丁醇)为引发剂、〓为催化剂，引发CL单体的聚合，合成了端羟基化的三臂或四臂星型PCL聚合物。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。