查询词典 free radical

Temperature-sensitive hydrogels P(NIPA-co-DiAB) with aromatic group as hydrophobe was were prepared by free radical micellar crosslinking copolymerization with N-isopropyl acrylamide, N,N-dially benzylamine as comonomers, N,N-methylene-bis-acrylamide as crosslinker, sodium dodecyl sulfate as surfactant and ammonium persulfatetetramethylethylenediamine as initiator system.

以N-异丙基丙烯酰胺、N，N-双烯丙基苄胺为共聚单体、N，N-亚甲基双丙烯酰胺为交联剂、十二烷基硫酸钠为表面活性剂、过硫酸铵-四甲基乙二胺为氧化还原引发体系，采用自由胶束交联共聚法合成了疏水基团为芳香基的疏水改性温敏性智能水凝胶P(NIPA-co-DiAB)。

Objective: To observe the protective effect of ginkgo bilo ba extrac t (EGb 761), a free radical scavenger, on the photoreceptor cells after lighti nduced retinal damage.

目的：探讨银杏叶提取物（EGb 761）对视网膜光损伤后感光细胞的保护作用。

Termination of free radical chairs occurs by a bimolecular reaction.

自由基链的终止产生于双分子反应。

The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.

采用过渡金属交换的分子筛作为催化剂，进行催化热裂解制取乙烯的反应，研究发现，在β沸石分子筛和ZSM-5分子筛中引入过渡金属后，催化热裂解反应的产物分布与相应的氢型分子筛相比有了较大的变化，说明过渡金属的加入对于催化热裂解反应的机理具有影响，Ⅷ族金属如Fe、Co、Ni和第Ⅰ、Ⅱ副族Cu、Zn表现出较强的氧化脱氢活性，产物中氢气、焦炭的产率很高，Ti、Cr则未表现出氧化作用：分子筛及催化剂中引入银后，催化热裂解反应的转化率和乙烯的产率有了提高，丙烯产率没有很大的变化，说明银在催化热裂解反应中能够促进正碳离子的生成，又有可能通过氧化-还原作用部分改变反应机理，促进了自由基的生成，并且由于银对烯烃的吸附很弱，其氢转移反应和脱氢、加氢活性比较低，有利于烯烃产率的提高。

Dietary Carnosine Sources — Carnosine is an antioxidant and protects the cells in the body from free radical damage.

Carnosine 是一种抗氧化剂，用来保护细胞免受自由基的伤害。

In order to provide some basic information for the health care effect and the utilization of safflower (Carthamus tinctorius L.), the free radical scavenging capacity and the effective methods for antioxidant components extraction were studied.

本研究分析了红花清除自由基的能力，并探讨了有效提取其抗氧化成分的方法，旨在为红花的保健效用及其开发利用提供基本资料。

Soybean ; Cercospora sojina Hara ; ESR ; Free radical

大豆；灰斑病菌；电子自旋共振；自由基

The results showed that the free radical generation rate and MDA content in Chlorophyceae L4 increased rapidly in early time (24 to 72 hours) of temperature increment, then decreased rapidly, and could return to tolerable leve1 at the end of time.

结果表明，在环境温度高于最适生长温度的初期(24~72h)，Chlorophyceae L4中自由基产生速率、丙二醛含量迅速提高，但随后(96~144h)很快降低，恢复到细胞能容忍的水平。

The method can be used to comprehend the relation between free radical and cholecystolithiasis by determining the SOD activity and LPO content of serum in the patients with cholecystolithiasis.

可认为检测胆囊结石患者血清中SOD的活性和LPO的含量，有助于了解自由基与胆囊结石的关系。

They also state in the article that chrysoeriol is already known for its antioxidant, anti-inflammatory, antitumor, antimicrobial, antiviral and free radical scavenging abilities.

他们还状态的文章， chrysoeriol已经知道其抗氧化，抗炎，抗肿瘤，抗菌，抗病毒和清除自由基的能力。

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。