二羧酸

In the leaves, the mesophyll cells surrounding the vascular bundles contain the carbon dioxide-fixing enzyme phosphoenolpyruvate carboxylase in their cytoplasm.

在叶片中，叶肉细胞包围着维管束，叶肉细胞细胞质中所包含的磷酸烯醇式丙酮酸羧化酶，具有比核酮糖二磷酸羧化酶更高的的与二氧化碳的亲和力。

The effect of carboxy methyl cellulose, high ester pectin and propy leneglucolalginate were significant, and we experienced the synergic effect of them by positive cross assay.

增稠剂羧甲基纤维素钠、高酯果胶及藻酸丙二醇酯能够显著提高调酸果奶的稳定性，并通过正交试验进行增稠剂的复配。

The effect of carboxy methyl cellulose, high ester pectin and propy leneglucolalginate were significant, and we experienced the synergic effect of them by positive cross assay.

增 稠剂羧甲基纤维素钠、高酯果胶及藻酸丙二醇酯能够显著提高调酸果奶的稳定性，并通过正交试验进行增稠剂的复配。

Firstly, 3-ethylthiobutanal was prepared from crotonaldehyde reacting with ethanehiol in triethylamine with high yield. Secondly, methyl acetoacetate was converted to 6-ethylthiohept-3-en-2-one by three steps via hydrolysis, condensation with 3-ethyltio-butanal and dehydration, then 6-ethylthiohept-3-en-2-one was cycloco ndensed with dimethyl malonate by Michael addition and Claisen condensation, followed by saponification and decarboxylation to give the intermediate of 5-(2-ethylthiopropyl)-cyclohexane-1,3-dione.

首先，以巴豆醛与乙硫醇为原料，在三乙胺的催化作用下高收率制得3-乙硫基丁醛；然后从乙酰乙酸甲酯出发，通过碱水解、与3-乙硫基丁醛缩合、脱水三步反应合成6-乙硫基-3-烯-2-庚酮，接着6-乙硫基-3-烯-2-庚酮与丙二酸二甲酯通过Michael加成和Claisen缩合成环，再通过皂化和脱羧反应生成中间体5-[2-丙基]-1，3-环己二酮；再与丙酸酐反应丙酰化，最后与0-3-氯-2-丙烯基羟胺肟化，得到目标化合物烯草酮。

The SERS spectra of isoquinoline and its six derivates 3 -isoquinolinecarboxylic hydrate (Ⅱ, 1-isoquinolinecarboxylic acid, methyl 3-isoquinolinecarboxylate, isocarbostyril, 5-hydroxy-isoquinoline and 1, 5-isoquinolinediol were obtained by mixing the chemicals with silver colloid.

应用SERS技术，我们获得了异喹啉及其六种衍生物3-羧基异喹啉(Ⅱ，1-基异喹啉，甲基-3-羧基异喹啉酸酯，1-羟基异喹啉，5-羟基异喹啉和1，5-二羟基异喹啉的喇曼光谱。

Our company specializes in operating plating materials: sulfamic acid nickel, nickel sulphate, nickel chloride, nickel carbonate, etc.; environmentally friendly sewage treatment materials: polyacrylamide, polypropylene acid sodium, ferrous sulfate, etc.; washing cleaning materials: OP - 10, TX-10, NP-9, K-12, JFC, sodium carboxymethyl cellulose, etc.; cosmetic raw materials: Triclosan, Resorcinol, stearic acid and so on, basic chemical raw materials: Industrial salt, soda ash industrial ammonium chloride, ammonium chloride agriculture, Sodium Sulfate, Sodium Molybdate, Ammonium Molybdate, as well as chemical products such as UV-absorbers.

本公司专业经营电镀原料：氨基磺酸镍，硫酸镍，氯化镍，碳酸镍等；环保污水处理原料：聚丙烯酰胺，聚丙烯酰钠，硫酸亚铁等；洗涤清洗原料：OP-10，TX-10，NP-9，K-12，JFC，羧甲基纤维素钠等；化妆品原料：三氯生，间苯二酚，硬脂酸等，基础化工原料：工业盐，纯碱，工业氯化铵，农业氯化铵，元明粉，钼酸钠，钼酸铵等以及紫外线吸收剂等化工产品。

Comb-shaped copolymer of polycarboxylate containing carboxyl,sulfonic groups(-SO3M),polyethylene glycol(-OC2H4-) was synthesized by monomers of sodium 2-acrylamido-2-methylpropane sulphonate,acrylic acid,polyethylene glycol monoester acrylate under certain conditions.

本文通过2-丙烯酰胺-2甲基丙基磺酸钠与丙烯酸、聚乙二醇单丙烯酸酯在一定条件下发生聚合反应合成含有羧基、磺酸基(—SO3M)、聚氧乙烯链(—OC2H4—)等侧链的高性能减水剂PC。

In the paper, new type of polyurethane ionomers containing carboxyl in soft segments was synthesized with IPDI, DMBA, carboxylated polycaprolactone etc.

本文利用一种新型的聚己内酯、异佛尔酮二异氰酸酯、二羟甲基丁酸等合成了软段含有羧基的聚氨酯离聚体。

Meldrum is a carboxyl-phthalocyanine weak resistance agent, with the activity of this enzyme metal ion (Mg2 + Mg2 +) formed fairly stable chelate, and its derivatives benzene methyl malonic acid is a strong resistance agent.

丙二酸是一个羧基酞酶的弱阻化剂，它与这种酶的活性金属离子(镁离子Mg2+)形成相当稳定的螯合物，而它的衍生物苯甲基丙二酸则是一个强阻化剂。

ABSTRACT: In the presence of sodium t-butoxide and DMSO,ethyl 2-oxocyclopentanecarboxylate was subjected to C-alkylation with 2-(4-bromomethylphenyl)propanoic acid with high regioselectivity to give 2-［4-(1-ethoxycarbonyl-2-oxo-1-cyclopentanylmethyl)phenyl］propanoic acid (4) which was followed by hydrolysis,decarboxylation and salt formation to afford loxoprofen sodium in about 72% overall yield.

在叔丁醇钠和二甲基亚砜的存在下，2-丙酸对2-乙氧羰基环戊酮进行C-烷基化，再经水解脱羧，成盐即得洛索洛芬钠，以2-丙酸计算，总收率为72%。

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。