查询词典 hydroxylation

Catalysts in three synthesis routes,the hydroxylation of 4-tert-butyl-phenol,the alkylation of pyrocatechol by tert-butyl alcohol and the alkylation of pyrocatechol by isobutene,were discussed in detail in terms of reaction conditions,catalysts,temperature,reaction time etc.

论述了对叔丁基苯酚羟基化法、邻苯二酚与叔丁醇烷基化法和邻苯二酚与异丁烯烷基化法生产对叔丁基邻苯二酚的合成路线的催化剂。

Based on different thickness hydroxylation content in quartz sample, the changes of Hydroxyl peak 3675cm^(-1 intensity is obvious of different thickness in quartz sample, and withe increase of Quartz plate thickness, the hydroxyl peak transmittance increases.

通过对石英样品中不同厚度羟基含量分析得出，对于不同厚度的石英样品，羟基峰（3675cm^(-1)左右）的强度变化十分明显，石英片厚度的增加，羟基峰的透射率增大。

Cytochrome P450 BM-3 (CYP102) from Bacillus megaterium catalyzes the subterminal hydroxylation of long-chain fatty acids (C12 to C20) at the positions ω-1,ω-2,ω-3 and the epoxidation of unsaturated fatty acids. Artificial mutants of P450 BM-3 also hydroxylate substrates like short-chain fatty acids (C8 to C10), alkanes, cycloalkanes, heteroarenes and polycyclic aromatic hydrocarbons, which offers potential applications in the pharmaceutical industry, environmental measurement and bioremediation and chemical industry.

细胞色素P450BM-3来源于Bacillus megaterium，能催化长链脂肪酸C_(12-C_(20)的次末端(ω-1，ω-2，ω-3)羟化及不饱和脂肪酸的环氧化，其突变体催化的底物拓展到中链的脂肪酸C_8-C_(10、烷烃、环烷烃、杂环烃、多环芳烃等，因此在医药工业、环境检测和修复及化学工业具有广阔的前景。

Tetrahedrally coordinated iron in framework-substituted microporous AlPO-5 catalysts are shown to be active and selective for the hydroxylation of benzene to phenol, using nitrous oxide as the oxidant.

四面体配铁架构取代硅微孔-5催化剂载有选择性的活跃和苯羟化苯酚、使用笑气作为氧化剂。

Cerebrotendinous xanthomatosis is a rare autosomal recessive disorder of bile acid synthesis, caused by impaired hydroxylation of cholesterol side chains due to deficiency of the mitochondrial enzyme sterol 27-hydroxylase （CYP27A1）, leading to accumulation of cholestanol and cholesterol in brain and other tissues.

文章摘要：脑腱黄瘤病是一种罕见的常染色体隐性遗传性胆汁酸合成障碍，由线粒体酶固醇27-羟化酶（CYP27A1）缺陷所致胆固醇侧链羟化受损引起，从而导致胆固烷醇和胆固醇在脑和其他组织贮积。

The experiments also show that adding NaHSO3 into the reaction liquid of hydroxylation reaction can inhibit the catalytic effect of benzoquinone and residual catalyst on the phenolic tars formation caused by oxo-condensation of the diphenols and therefore reduce the tars formation of the diphenols in the reaction solution.

在羟基化反应液中加入亚硫酸氢钠可以抑制对苯醌和残留催化剂对苯二酚氧化缩合生成焦油的催化作用，从而减少了反应液中苯二酚的生焦反应。

The results indicated that the water or 50% ethanol extracts from peonies petals could reduce light absorption of DPPH and OH initiated hydroxylation of salicylate, and inhibit O2(superscript -) mediated light chemical reduction of nitroblue tetrazolium effectively, and lipid peroxidation of polyunsaturated fatty from yolk lipoprotein, in which DPPH scavenging activities of 6 peonies water extracts were hinger than that of 200 μg/mL BHT, but lower than 80 μg/mL Vc. In 4 kinds of detecting systems of antioxidation, the peroxidation activity of deep colored flowers of peonies was higher than that of light colored flowers of peonies.

牡丹花瓣提取液能明显抑制卵黄组织匀浆的脂质过氧化作用，降低DPPH的吸光值、抑制O2介导的NBT光化学还原及OH作用下的水杨酸羟基化作用，其中牡丹花瓣提取液清除DPPH自由基的活性高于200μg/mL BHT，但低于80μg/mL Vc.6个品种的牡丹花瓣提取液，在4种测定系统中均具有一定程度的抗氧化能力，且水提取液的抗氧化活性略高于体积分数50%乙醇提取液，深色花瓣提取液对不同自由基的清除能力较强。

The method comprises following steps: reacting hydroxylation carbon nano-tube successively with reagent containing halogen and hydrosulphide to prepare sulfhydryl carbon nano-tube; reflowing the sulfhydryl carbon nano-tube and platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum / carbon nano-tube catalyst; reflowing the sulfhydryl carbon nano-tube successively with the hydrochloroauric acid and the platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum-gold / carbon nano-tube catalyst.

本发明将市售羟基化碳纳米管先后与含卤试剂和氢硫化物反应得到巯基化碳纳米管。再将巯基化碳纳米管与铂盐在多元醇中回流，氢气氛中处理得到巯基锚固铂/碳纳米管催化剂。将巯基化碳纳米管依次与氯金酸和铂盐在多元醇中回流，氢气氛中处理得到巯基锚固铂-金/碳纳米管催化剂。

By adjusting the synthesis conditions, including temperature, pH value of the mixture solution and reaction time, the degree of the hydroxylation of isophthalic acid can be relatively controlled and the product of different structures can be obtained.

控制合成反应条件，可使部分间苯二甲酸配体发生转化而获得不同组成和结构的产物。

By adjusting the synthesis conditions, including temperature, pH value of the mixture solution and reaction time, the degree of the hydroxylation of isophthalic acid can be relatively controlled and the product of different structures can be obtained.

控制合成反应条件，可使部分间苯二甲酸配体发生转化而获得不同组成利结构的产物。

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。