羟基酸

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。

Result: Eight compounds were isolated from ethanolic extract of the brown alga D.divaricata and their structures were identified as-torreyol,4β,5α-dihydroxycubenol,3-farnesyl-p-hydroxybenzioc acid,chromazonarol,fucosterol,phenyl acetylamine,4-hydroxybenzoic acid and n-hexadecanoic acid.

结果：从叉开网翼藻中分离得到8个化合物，分别鉴定为-torreyol，4β，5-αdihydroxycubenol，3-farnesyl--phydroxybenzioc acid，chromazonarol，岩藻甾醇，苯乙酰胺，4-羟基苯甲酸和正十六酸。

The E-TOF will also be feasible and practical to assist chemists in screening the optimal reaction condition or evaluating the overall efficiency of different catalytic systems for a specific asymmetric reaction.4.For the first time,we explored chiralγ-hydroxy-α,β-acetylenic esters,which were prepared via asymmetric alkynylation,as key intermediates to the synthesis of chiralγ-butyrolactones. This convergent and enantioselective approach to chiralγ-butyrolactones is practical and easily handled with protecting group free.

这一概念包括反应产率、对映选择性、配体用量以及反应时间四个重要反应参数，不仅适用同一反应不同催化体系的横向综合性评价，而且适用于某一特定反应催化体系的优化过程，有助于研究人员选择最佳的反应条件。4、我们发展了以手性γ-羟基-α，β-炔酸酯为关键中间体完成了手性γ-丁内酯类天然产物的对映立体选择性全合成，该关键中间体能够以我们的催化体系方便的对映选择性合成，之后的官能团转换方法成熟，易于操作，无需进行繁琐的官能团保护和脱保护过程，绿色经济。

With 1,2-dimethoxyethaneas an additive,the reaction proceeded under mild condition to gave the highly functionalizedγ-hydroxy-α,β-acetylenic esters,and highly toxic reagent was avoided.

以DME为添加剂使不对称合成手性γ-羟基-α，β-炔酸酯的反应条件更加温和、易于操作，避免了剧毒物质的使用。

In this study, six patients with piebaldism had removal of achromic epidermis via appropriately set erbium:YAG laser followed by application of autologous cultured epidermal grafts on the recipient bed. The 3,4-dihydroxyphenylalanine reaction was used to determine melanocyte content, and a semiautomatic image analysis system calculated the percentage of repigmentation.

在这项研究中，六名通过适当能量设定之铒-雅克雷射，移除色素缺乏表皮的白斑病患，在受体皮肤上以自体培养表皮移植的应用加以追踪。3.4-羟基苯丙胺酸反应用以测定黑色素细胞内容，并以半自动影像分析系统计算再色素沉淀的百分比。

In this thesis, monomer with unsaturated double bond was firstly synthesized byreacting acryloyl chloride with bifunctional monomer. Such synthesized monomer ormonomer with initial unsaturated double bond was used to prepare linear polymericmaterials by free radical polymerization. A series of new degradable space polymerswith acylamino bond were subsequently synthesized using diisocyanate as thecross-linker.

本文首先通过丙烯酰氯和双官能团单体反应引入不饱和双键，或者直接使用具有不饱和双键的单体，通过自由基聚合得到含有活泼羟基或氨基的线型高分子聚合物，再用二异氰酸酯作为交联剂交联，从而合成了一系列基于酰胺键的新型可降解高分子体型聚合物。

Although the acidity of some phenolic ligands, Lascorbic acid and 8 quinolinol is weak, the yield of adipic acid is still high.

尽管一些酚类配体、L抗坏血酸和 8 羟基喹啉的酸性较弱，但己二酸的产率仍然很高。

Biodgradable polyhydroxybytyrate plastics can be produced by fermentation of the alcaligenes.

产碱杆菌发酵能生产降解性塑料聚羟基丁酸酯。

A certain amount of naphthenic,alkenyl and aromatic acids are also generated in the degraded samples.

可以推断，短短芽孢杆菌和蜡状芽孢杆菌对大庆原油的降解以氧化降解为主要途径，存在一种非常规的次末端氧化，同时兼有末端氧化和双末端氧化，生成单脂肪酸、羟基脂肪酸和二羧酸。

The stability of the aqueous solution, aminolysis and hydrolysis of hydroxyglycine were examined.

并对羟基甘氨酸的溶液稳定性，氨解，水解进行了研究。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。