乳酸基

Similarly, the acyl-oxygen cleavage of MG mainly occurs at theleast hindered carbonyl group and alternating D,L-PLGA50 wasobtained.

同样，MG单体的开环主要发生在位阻较小的羰基一侧〓，合成了窄分子量分布的聚乳酸-交替-聚乙醇酸共聚物。

The second reaction we tested was diastereoselective Michael-Aldol annulation of -keto ester 121 with methacrolein to give a key intermediate for synthesizing (--Huperzine A.

通过对反应条件的筛选，我们得到的最好的结果是以-乳酸苄酯为手性辅基的β-酮酯121i为底物，以(1R， 2R)-环己二胺衍生的手性胍85i为催化剂，以无水四氢呋喃为溶剂，在-20℃反应，得到的产物的de值为73.2%。

Objective To study the biological behavior of bone marrow stromal cell cultured in vitro with the polylactic acid.

目的 检测聚乳酸对骨髓基质细胞体外成骨的过程及其生物学行为的影响。

Examples of humectants include lactic acid, urea (the urea found in creams is synthetically produced by combining one molecule of carbon dioxide with two molecules of ammonia and not obtained from urine), hyaluronic acid (able to retain 1000 times its weight of water), propylene glycol, glycerin, sorbitol, gelatin, lecithin, sodium pyrrolidone carboxylic acid, and butylene glycol.

常见的湿润剂有乳酸，尿素（面霜里的尿素来自于二氧化碳和氨分子的合成而不是从尿中提取的），透明质酸（能保持自身成分1000倍的水分），丙二醇，丙三醇，山梨糖醇，明胶，卵磷脂，吡咯钠，羧基酸和丁二醇。

Water,c12-20 acid peg-8 ester,caprylic/capric triglyceride,proplylene glycol,ppg-15 stearyl ether,chondrus crispus,iris germanica(orris extract/cells),centaurea cyanus,macadamia ternifolia,buxus chinensis,triethanolamine,potassium cetyl phosphate,butyrospermum parkii,c12-13 alkyl lactate,carbomer,phenoxyethanol,methylparaben,imidazolidinyl urea,glyceryl hydroxystearin,tocopheryl acetate.retinyl palmitate,sodium hyaluronate,biosaccharide gum-1,propylparaben,disodium edta,ethylparaben,pentadecalactone,hydroxystearic acid,tetradecyloctadecanoic acid,tetradecyleicosanoic acid,hexadecyleicosanoic acid,butylparaben,isobutylparaben,chlorhexidine digluconate,tocopherol,lecithin,ascorbyl palmitate,glyceryl stearate,glyceryl oleate,BHT,citric acid.

水，C12-20 酸 PEG-8酯，辛酸/癸酸三酸甘油酯，丙二醇，PPG-15 硬脂基醚，卡拉胶萃取，德国鸢尾花提取物/细胞，矢车菊提取物，澳洲坚果油，荷荷巴油，三乙醇胺，十六烷基磷酸钾，牛油果，c12-13烷醇乳酸酯，卡波姆，苯氧乙醇，羟苯甲酯，尿素醛，甘油羟基硬脂酸酯，醋酸盐维他命E，维他命A酯，透明质酸钠，多醣物质，羟苯丙酯，乙酸乙二胺二钠，羟苯乙酯，环十五内酯，羟基硬脂酸，十四烷基十八烷酸，十四烷基二十烷酸，十六烷基二十烷酸，羟苯丁酯，对羟基苯甲酸异丁酯，洗必泰葡萄糖酸盐，维生素E，卵磷脂，抗坏血酸棕榈酸酯，甘油硬脂酸，甘油油酸酯，BHT，柠檬酸。水：几乎所有护肤品成分第一位都是水。辛酸/癸酸三酸甘油酯：润滑剂、扩散剂，棕榈油/椰子油衍生物

The beheviour of four low-molecule weight organic acid lactic acid,hydroxy-acetic acid,mercapto-acetic acid,glyconic acid as iron-containing silicate-aegirines depressants on the hematite direct flotation is investigated in this paper.The results of flota

本文研究了四种小分子有机酸抑制剂乳酸、羟基乙酸、巯基乙酸、葡糖酸在赤铁矿正浮选中对含铁硅酸盐脉石霓石的抑制行为，纯矿物、人工混合矿与实际矿石浮选实验均证明了它们具有良好的选择性抑制作用，可以成功地实现赤铁矿与霓石的浮选分离。

The complex biological preservatives consisting of lysozyme and / or nisin possessed a good preserving effect on razor clam, with the combination of lysozyme and nisin better than the individual one, possibly because the condition of their application and anti-bacterial spectrum can supplement each other as to increase their anti-bacterial spectrum.Razor clam was hydrolyzed with four kinds of proteases including subtilisin, flavourzyme, bromelain and acid protease.

用溶菌酶、乳酸链球菌素等组成的复合生物保鲜剂处理，结合冷藏保鲜蛏肉，各保鲜剂组的总挥发性盐基氮和细菌总数增加速度均慢于普通冷藏的蛏肉，从色泽、弹性、气味、黏度等感官评定指标来看，保鲜效果也均明显优于普通冷藏，说明溶菌酶、NISIN等对蛏肉具有较好的防腐保鲜效果。

With thioglycollic acid as stablizing agent, cadmium selenide quantum dots were prepared, and the coating of CdSe with polylactide was studied.

摘 要：以巯基乙酸为稳定剂，制备CdSe量子点，并考察聚乳酸对量子点的包被。

In this article, high-pure lactic acid and ethanol acid were used to synthesized PLGA by direct condensation polymerization, and zinc octanoate of low nocuity was used as katalyst, instead of stannous octanoate to synthesize PLGA by the way of opening ring.

本文首次采用高纯度乳酸、乙醇酸直接缩聚合成无催化剂的端羧基PLGA，并分别采用了低毒性辛酸锌代替辛酸亚锡为催化剂通过开环聚合法合成端羧基／酯封端PLGA。

The human cartilages are composed of chondrocyte and extracellular matrix , the form of chondrocytes are hypertrophy and the quantity are less; the ECM of cartilage are compised of type Ⅱ collagen and proteoglycan. Articular cartilages are all hyaline with little fibers. Trauma and arthritis are the main cause of cartilage injury, the ommilayer injury ofcartilage can be recovered by marrow, but because of without stimulation mechanism, the new tissues are merely fibrocartilages, they can not be coincide with hyaline cartilage in menchanics; the purely damage of articular cartilage can not stimulate chondrocyte to regenerate because of without blood circulation, thus, the plerosis of articular catilage can not depend on the proliferation of local chondrocyte. Ever since, people tried their best to find a way to reconstruct articular cartilage.

中文题名人骨髓基质干细胞成软骨诱导及多孔复合材料作为细胞载体的体外实验研究副题名外文题名 Cartilage induction of human mesenchymal stem cells and experiment on compound porous materials as cells' scaffold in vitro 论文作者刘晓岚导师周江南学科专业外科学研究领域\研究方向学位级别博士学位授予单位中南大学学位授予日期2003 论文页码总数68页关键词骨组织工程软骨细胞骨髓基质干细胞壳聚糖高分子外消旋聚乳酸馆藏号BSLW /2003 /R68 /10 造成人体关节软骨损伤的原因主要为创伤和关节炎，关节软骨全层损伤可由于骨髓中间充质干细胞的高速增殖修复，但这种修复由于缺乏相应的刺激机制，只能形成纤维软骨，而不能形成符合关节生理、力学要求的透明软骨；单纯软骨部分损伤软骨组织内无血管，软骨细胞迁移迟缓，无法使损伤区域软骨细胞再生，因此，关节炎及关节创伤后的软骨修复不能依赖于软骨细胞的增殖和迁移。

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。