羟基

The aim of the study was to investigate the radiological characteristics and improve accurate diagnosis of calcium pyrophosphate dihydrate crystal deposition disease.

［目的］探讨二羟基焦磷酸钙晶体沉积症的影像学特征，提高诊断准确率。

Ingredients to a liquid bandage typically include pyroxylin and 8-Hydroxyquinoline, dissolved in alcohol.

白兰氏液体绷带通常包括pyroxylin和8羟基喹啉，溶于酒精。

Meso tetramethoxyphenyl porphyrin ; pyrrol ; para hydroxy benzaldehyde ; synthesis

间-四对甲氧基苯基卟啉；吡咯；对羟基苯甲醛；合成

Results Eleven compounds were isolated and identified as:quercetin(1),kaempferol(2),quercitrin(3),protocatechuic acid(4),gallic acid(5),protocatechuic acid ethyl ester(6),ethyl gallate(7),vanillic acid(8),1,5,7-trihydroxyl-3methylan...

结果得到11个化合物，分别鉴定为：槲皮素(1)、山柰酚(2)、槲皮苷(3)、原儿茶酸(4)、没食子酸(5)、原儿茶酸乙酯(6)、没食子酸乙酯(7)、香草酸(8)、1，5，7-三羟基-3-甲基蒽醌(9)、琥珀酸(10)、5-羟甲基糠醛(11)。结论化合物6、7、9、11为首次从该属植物中分离得到。

Results: Seven compounds were isolated from the ethanol extract of the fruits and identified as oleanolic acid, luteolin-7-O-β-D-glucoside, quercitrin,β-sitosterol-3-O-β-D-glucoside, p-hydroxyphenethyl-β-D-glucoside, D-mannitol and hexitol.

结果：从女贞子的乙醇提取物中分离得到7个单体化合物，分别鉴定为齐墩果酸、木犀草素－7-O-β-D-葡萄糖苷、槲皮苷、β-胡萝卜苷、对羟基苯乙醇－β-D-葡萄糖苷、甘露醇及己六醇。

Objective: through various chemical synthesis target compounds 4 -- 6 - the - 7 -(2 - hydroxyl replace c oxygen radicals) quinazoline compounds were synthesized and the structure of the modified, so as to get high epidermal growth factor receptor tyrosine kinase inhibitor.

目的：通过各种化学合成方法完成目标化合物4--6-甲氧基-7-(2-羟基取代丙氧基)喹唑啉的合成并对目标化合物进行结构修饰，以期获得高活性的表皮生长因子受体酪氨酸激酶抑制剂。

the target compounds synthesized to synthesize a series after 4 - instead of aniline - 6 -(2 - hydroxyl replace c oxygen radicals) quinazoline compounds has laid a good foundation.

目标化合物的顺利合成为以后合成一系列4-取代苯胺-6-(2-羟基取代丙氧基)喹唑啉类化合物奠定了良好的基础。

The goal of the successful synthesis of compounds for the subsequent synthesis of a series of 4 - to replace the aniline -6 -(2 - hydroxy replace C oxy) quinazoline compounds laid a good foundation.

目标化合物的顺利合成为以后合成一系列4-取代苯胺-6-(2-羟基取代丙氧基)喹唑啉类化合物奠定了良好的基础。

The excited-state intramolecular proton transfer tautomerism reaction of 6-methyl-4-hydroxy pyri-midine monomers and dimmers was investigated by the ab initio method with the self-consistent reaction field with Tomas's polarized continuum mode and CIS theories at HF level on the basis of 6-311+G* and 6-31G basis set. By studying the potential energy surface, it was found that the monomer's ground-state proton transfer process together with the excited-state proton transfer process is a molecular system of four energy level, but dimmers were not, which can be used to explain the fact that UV-visible absorption and fluorescence spectra of monomer and dimers all corresponded to quinoid.

采用 ab initio HF理论的组态相关CIS方法和连续溶剂模型PCM，分别在6-311+G*和6-31G水平上研究了6-甲基-4-羟基嘧啶单体及二聚体激发态质子转移的异构化反应；对其反应势能面的研究发现，单体基态和激发态的异构化反应一起可以形成四能级的分子电子体系，而二聚体的却不能，由此解释了单体和二聚体的紫外吸收光谱和荧光发射光谱均对应于酮式构型的原因。

Benzyloxy benzoyldimethylsulfoxide was prepared by the reaction of ethyl 4-benzyloxybenzoate and dimethyl sulfoxide in the presence of sodium hydride, followed by Pummerer reaction with concentrated hydrochloric acid to afford eo-hydroxy-co-thio-methyl-(4/-benzyloxy) acetophenone, which reacted with urea, thiosemicarbazide, semicarbazide hydrochloride and o-phenylenediamine to give imidazolidine-2,4-dione, l,2,4-triazine-3- one and quinoxaline derivatives, respectively.

本文用4-苄氧基苯甲酸乙酯和二甲亚砜为原料，在氢化钠存在下反应，合成了(4′-苄氧基)-苯甲酰基-二甲亚砜。研究了该亚砜在浓盐酸的存在下发生的Pummerer重排反应，用重排产物ω-羟基-ω-甲硫基-(4′-苄氧基)-苯乙酮分别与尿素、氨基脲、氨基硫脲和邻苯二胺反应合成了2，4-咪唑啉-二酮、1，2，4-三嗪-3-酮、喹喔啉等含氮杂环化合物。

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。