羟基

The absorbability and retentivity of crosslinked polyacrylamide and its modified products to water and fertilizer were investigated.

由于羧基、羟基和胺基的协同作用，对水和肥的保持、吸收能力大大增强。水解4h的产物PAM-4中羧基、羟基和胺基的协同作用最好，对水和肥的保持、吸收能力最强。

Multi-hydroxyl polymer,CXC-1,as an anti-sloughing agent for water base drilling fluids,is a yellowish liquid and is prepared by polymerization of alkylene oxides and polyhydroxylated compounds.

多羟基聚合物防塌剂 CXC-1是以环氧化物及多羟基化合物共聚而成的聚合物防塌剂，为淡黄色黏稠液体。

At first,the intermediate of sodium 3-chloro-2-hydroxy propanesulfate was synthesized from epichlorohydrin and sodium bisulfite;And then,using NaOH as a catalyst,the title compound has been synthesized from intermediate and allyl alcohol to reach the yield of about 70%.

先由环氧氯丙烷和亚硫酸氢钠合成中间体3-氯-2-羟基丙磺酸钠，然后中间体再与丙烯醇在氢氧化钠催化下生成目标产物2-羟基-3-烯丙氧基丙磺酸钠。

Then Doripenem came into the market in the July ,2005. We studied the synthesis of Doripemen.Firstly, we synthesized the chemical 2 from the starting material------o-hydroxylphenylacylamine through Reformastky reaction, alkylation, Diekmann reaction, enolization, esterification and etc. Secondly, we synthesized the chemical 3 from L — hydroxylproline through the protection of carboxyl, amidogen and hydroxyl group, reduction by NaBr, SN_2 substitution and Mitsumobu reaction.

我们以水杨酰胺为起始原料，经Reformatsky反应、烷基化、Diekmann环合、烯醇化、酯化等反应合成双环母核2；再从L-羟基脯氨酸出发，经酯化保护羧基、保护氨基、保护羟基、硼氢化还原酯得醇、Sn2取代和Mitsumobu反应等合成巯基侧链3；最后由化合物3经脱保护、水解得硫醇，和化合物2在二异丙基乙基胺的作用下缩合，最后Pd／C催化脱保护，历经16步反应最终得到产物多尼培南。

Glycols (e.g., ethylene glycol, or antifreeze) contain two hydroxyl groups, glycerol three, and polyols three or more.

甘醇有两个羟基，丙三醇有三个羟基，多元醇则有三个或三个以上羟基。

The separation behavior of o hydroxybenzoic acid, m hydroxybenzoic acid and p hydroxybenzoic acid in high performance capillary zone electrophoresis was investigated using cetyltrimethylammonium bromide as reversed reagent for electroosmotic flow The effects of pH of buffer solution and volume fraction of methanol on the separation, peak shape and elution order were studie

采用十六烷基三甲基溴化铵为电渗流改性剂，考察了邻羟基苯甲酸、间羟基苯甲酸和对羟基苯甲酸在高效毛细管区带电泳模式下的分离行为，研究了缓冲液的pH和添加剂甲醇的用量对这 3种同分异构体的分离、峰形和出峰顺序的影响，并据此优化了这 3种异构体的分离条件。

3 Carotenoids were identified by chromogenic reaction, thin-layer chromatography ,and spectroaanalysis,and were compared with maize yellow pigment and β.

从小米中提得天然食用黄色素，通过显色反应、薄层层析和光谱分析，并与玉米黄色素和β—胡萝卜素标准品相对照，确定其主要化学成分为类胡萝卜素，可能有：玉米黄素(3，3′—二羟基—β—胡萝卜素)，隐黄素(3—羟基—β—胡萝卜素)和叶黄素(3，3′—二羟基—α—胡萝卜素)等。

The activation energy of B ring elementary reaction is between 16～20kJ/mol.

从IRC结果以及对过渡态结构的电子密度拓扑学分析结果可以确定，羟基自由基在反应过程之中抽取了黄酮类化合物A环上未参与分子内氢键结构的酚羟基上的氢原子形成水分子及稳定性更高的半醌式大环自由基，在整个过程之中羟基自由基从反应物一侧进攻并逐渐发生扭转，直至形成一个进平面结构的过渡态结构，这与上一章关于黄酮类化合物B环的研究结果基本一致。

The research results demonstrated that it was a good method that hydrxoypivalic acid was prepared from hydroxypivalaldhyde by the direct electrooxidation method at the lead dioxide and tin dioxide electrodes.

以羟基新戊醛为原料，PbO2电极对羟基新戊醛的电催化活性最高，以硫酸为支持电解质，有隔膜电解槽内，生成羟基新戊酸的选择性和电流效率最高。

The following main results are obtained: The TiO_2 photocatalyst with small crystallite size, high surface area, narrow and uniform pore size distribution, and microporous frameworks could be prepared out by applying MW radiation in the preparation process. The microwave-induced fluorescence technique verified for the first time that microwave enhanced the formation rate of hydroxyl radical, leading to the increase in the photocatalytic efficiency. Compared with the conventional catalyst, TiO_2 prepared by MW dielectric heating owns a higher UV absorption ability, and its optical absorption edge and photovoltaic response are shifted toward the short wavelength region, resulting in increase of photooxidation efficiency. The photocatalytic conversion and the mineralization ratio of acetaldehyde are increased respectively by 30% and 40% over the TiO2 prepared by MW radiation when compared to the TiO2 prepared by the conventional heating. For the MW-assisted photocatalytic reaction over the MW-prepared TiO2, production of hydroxyl radicals is enhanced by 22.5%, and the photocatalytic conversion is accordingly increased by 20%. Similarlly, applying MW also increased the photocatalytic conversion and the mineralization ratio of acetaldehyde over TiO2/Al2O3 sample.

论文得到如下主要结果和结论：(1)微波介电加热TiO_2 溶胶可得到晶粒度小、光催化活性高、比表面积大和孔径分布窄而均一，且微孔发达的TiO_2光催化剂；在溶胶干燥处理过程中微波可使催化剂表面缺陷增加，进而导致光催化反应过程有更多的活性羟基自由基产生；(2)微波制备能显著增强TiO_2 样品的紫外光吸收率，并使其光吸收和光伏响应阈值发生蓝移，从而提高TiO_2的氧化还原能力；(3)与常规加热法所制TiO_2比较，微波法制备的TiO_2对乙醛的光催化降解转化率提高30%，CO_2生成率提高40%以上；(4)与未加微波辐射时相比，发现在光催化反应过程中施加微波，TiO_2 的羟基自由基生成速率提高了22.5%，相应CH_3CHO 光催化降解转化率提高了20%；对Al_2O_3/TiO_2催化剂，CH_3CHO 光催化降解转化率甚至提高了33%，同时CO_2 的生成率也都大幅度提高；(5)微波辐射可改变光催化降解乙醛的产物分布，推断施加微波时乙醛光催化降解按照羟基自由基引发的链式反应机理进行，微波&非热效应&起主要作用。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。