查询词典 enzymes

Sahghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China Abstract: Carboxylesterases are a group of related enzymes that catalyze the hydrolysis of a vast number of ester-containing endogenous and exogenous compounds.

中国科学院上海生理生态研究所，上海 200025 摘要：羧酸酯酶水解众多内源和外源含酯的化合物。

Objective To study the damage effect of lead acetate on DNA and its mechanism and the changes of antioxidative enzymes in vivo.

目的 探讨醋酸铅对动物体内DNA的损伤作用、机制以及抗氧化酶的变化情况。

The proteins and enzymes in saliva sample were removed by centrifugation and filtration of the mixture of acetonitrile and saliva sample.

将等体积的乙腈和唾液混合，然后通过离心和过滤的方法除去唾液样本中的蛋白质和酶。

After freezing, the tissue is powdered and the enzymes are inactivated by precipitation with perchloric acid.

冷冻之后，组织被粉碎，其中的酶用高氯酸迅速失活。

The company is dedicated to develop and produce a series of nutritional and non-nutritional animal feed additives, including natural pigment, feed enzymes, antioxidant, mould inhibitor, flavor, acidifier and feed premixes and concentrates.

本公司致力于研制和生产包括天然色素、酶制剂、抗氧化剂、防霉剂、调味剂、酸化剂、预混合饲料等一系列营养性、非营养性动物饲料添加剂。

After seedling trees of Yunhe Snow Pear were polluted by Pb(superscript 2+), Cd(superscript 2+), synthesis of chlorophyll was restrained, toxic effect of Pb(superscript 2+), Cd(superscript 2+) on seedling trees was intensified, membrane lipid peroxidation damage was increased. And the protective enzymes system start-up of polluted seedling trees enhanced antioxidative enzymes activities of seedling trees.

结论］Pb(上标 2+)、Cd(上标 2+)污染云和雪梨苗，抑制叶绿素的合成，增强超养阴离子自由基O2(上标-对植株的毒害性，使膜脂过氧化损伤程度高，受重金属污染植株启动保护酶系统，以增强植株的抗氧化性。

The results suggested that the activities of these enzymes quickly enhanced at 1 d, 3 d, 5 d and 7 d after inoculation by injecting conidia of the false smut fungus at 7-10 d before heading in the resistant cultivars, but slower increase in the susceptible cultivars, and also showed that there was correlations between the cultivar resistance to the disease and the three enzymes.

结果表明，在抗病品种中苯丙氨酸解氨酶、过氧化物酶和多酚氧化酶3种酶活性接种后迅速提高，变化幅度较大；而感病品种的酶活性在接种后缓慢增加，变化幅度小。由此说明，这3种防御酶与水稻抗稻曲病有一定的关系。关键词水稻；稻曲病；防御酶

Using a long-term reared housefly population which is very susceptible to pyrethroid insecticides as the susceptible strain, a population collected in 1993 in Shanghai and has been treaded by cyhalothrin as the resistant strain, we bioassayed their susceptibility to organophosphorus, carbamate, pyrethroid and organehloride insecticides. We also investigated the role of metabolic enzymes, i. e. esterase, GST, MFO and of target enzymes, i. e. AChE and 〓-ATPase in resistance to insecticides. Cyhalothrin resistance inheritance, the co-toxicity coefficient of cyhalothrin and methylene dithiocyanate was also studied. The insecticides resistance in adults and larvae of houseflies was compared and the mechanism of resistance differences between adults and larvae was discussed.

本文以采自野外并经过室内多代筛选的三氟氯氰菊酯抗性家蝇品系和室内多年饲养的敏感家蝇品系为试虫，测定了抗性家蝇品系和敏感家蝇品系对拟除虫菊酯杀虫剂三氟氯氰菊酯、氯菊酯、有机磷杀虫剂DDVP、氨基甲酸酯杀虫剂残杀威、有机氧杀虫剂DDT的抗性水平，并通过活体增效剂实验和离体生化实验研究了抗性品系的解毒酶和靶标酶的变化，本文还研究了三氟氯氰菊酯和增效剂I对抗性家蝇的增效作用及增效机理、家蝇幼虫和成虫对杀虫剂的抗性差异及其抗性差异的机理。

Methods(1) Construction of plant expression vector containing RS geneThe cloning vector pT-RS was constructed containing RS gene extracted from the leaf tip of Vitis vinifera by PCR amplification and RS sequence was identified by PCR amplification,enzymes digestion and sequence analysis.The plant expression vector containing RS gene was obtained and RS sequence was identified by PCR amplification and double enzymes digestion too.

研究方法(1)含白藜芦醇合酶基因的植物表达载体的构建提取葡萄基因组总DNA，通过PCR扩增得到RS基因，将此基因连接到克隆载体pGEM-T Vector，得到重组载体pT-RS；经PCR、酶切及序列分析鉴定后，将RS基因克隆到植物表达载体pBI121，得到重组载体pBI-RS，用PCR及双酶切方法进行鉴定。

The experiment selected dairy fresh milk as raw material, EZAL and MAOLL as fermentation agent, microbial rennet, swine pepsin, lamb rennet, calf rennet, papain and ficin as milk-clotting enzymes to produce hard cheese. This paper studied the physical, chemical and biochemical characteristics of different milk-clotting enzymes during the cheesemaking.

以当日鲜奶为原料，EZAL、MAOLL作为发酵剂，微生物酶、小牛皱胃酶、胃蛋酶、羔羊皱胃酶、木瓜蛋白酶和无花果蛋白酶作为凝乳酶生产硬质干酪，研究了不同凝乳酶在干酪成熟期的理化和生化特性。

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。