羟基

Besides, we develop resonance scattering method to devermine the zine in food, with satisfactory results also.

绪论：综述了近年来共振散射技术在分析化学中的应用、羟基自由基及氯氧化物的分析研究进展，引用文献206篇。

Poly β hydroxybutyric acid; Zoogloea ; op timized optimal culture medium ; fermentation conditions

聚β－羟基丁酸；动胶菌；优化培养基；发酵条件

It was found that ARA was composed of esterification products of (2-HEA)-ester with pimaric acid, dehydroabietic acid, abietic acid and two isomers of acrylpimaric acid. ARA is a good crosslinking agent which can copolymerize with most vinyl monomers. The properties of solvent-resistance and heat resistance of the copolymer were improved considerably by the use of ARA.

实验结果表明：ARA主要由海松酸、脱氢枞酸、枞酸和丙烯海松酸的二种异构体的丙烯酸－2-羟基乙基酯的酯化产物组成，ARA是一种良好的交联剂，可与大多数乙烯基单体共聚合，其与MMA的共聚物的耐溶剂性和耐热性均得到了较大幅度的提高。

The results show that the bioceramic coating contains such bioactive phases as hydroxyapatite and tricalcium phosphate during laser cladoping. And the interlaced flake structure and micropores of about 0.5~2 μm in size exist on the surface of accidented gradient bioceramic coating, suitable to grow new bone along with the surface and micropore.

结果表明：激光熔覆复合涂层中生成了羟基磷灰石和磷酸三钙等生物活性相，凹凸不平的表面出现网络交错的片状结构和微孔(孔径为0.5~2 μm)，有利于新骨沿着表面及内部连通微孔攀附生长。

Hydroxyapatite acerate nanoparticles with mean size ranging form 20~50nm are synthesized by the impinging stream devise using emulsion systems consisting of aqueous phase, cyclohexane as the oil phase and OP-10, n-octanol as the nonionic surfactant in definite pH value.

在一定pH值条件下，采用水溶液/环己烷/OP-10/正辛醇四元反相微乳液体系并结合撞击流技术制备出粒径为20~50nm的针状纳米羟基磷灰石晶体。

Any of three compounds (acetoacetic acid, acetone, and/or beta-hydroxybutyric acid) found in excess in blood and urine of persons with metabolic disorders.

三种化合物中任意一种（乙酰乙酸、丙酮和/或β羟基丁酸），人体的血液和尿中大量含有。

The nutritional and environmental conditions for acetoin product ion from Bacillus licheniformis in flasks were studied in this manuscript.

初步研究了摇瓶条件下地衣芽孢杆菌发酵生产3-羟基－2-T酮的工艺条件。

Then fed-batch fermentation was performed with glucose feeding. The yield of acetoin achieved at 20 g/L in fed-batch fermentation with glucose feeding.

在优化的发酵条件下，采用分批补糖的工艺，摇瓶发酵产量可稳定在20g/L以上，为3-羟基－2-丁酮的工业化生产提供了一定的基础。

In this paper, the synthesis ways and applications of 4,5-dimethyl-l,3-dioxolen -2-one were introduced. An appropriate way synthesizing DMDO from acetoin via acylation, cyclization and dehydrochlorination was selected. The influences of various process conditions on the reaction were studied in detail, and the optimum process conditions were obtained by single factor experiments.

本文介绍了医药中间体4，5-二甲基-1，3-二氧杂环戊烯-2-酮的应用情况和合成路线，选择了适于工业化生产的工艺路线，即采用羟基丁酮为原料，经酰化、环合和脱氯化氢等步骤合成DMDO，并采用单因素试验法详细研究了各项工艺条件对反应结果的影响规律，确定了优化工艺条件。

It shown that PDC does not only catalyze the production of acetaldehyde (PDC's main activity), but also catalyzes an aldoltype condensation reaction in which the hydroxyethyl-ThDP intermediate of enzyme is condensed with a second acetaldehyde to form acetoin.

在研究中发现PDC不仅能催化产生乙醛，还具有醛连接酶的活性。即将二个乙醛分子缩合成3-羟基丁酮，尽管这个活性比产生乙醛的活性低得多。

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。