查询词典 free radical

Objective To discuss the effect of free radical and free radical scavenge on the damage of kidney.

目的 探讨自由基及其清除因素在肾脏病理损害过程中的影响。

Sodium 2-Acrylarnido-Acetate has been synthesized through the reaction of Aminoacetic acid with acryloyl chlorine, then Copolymer of sodium 2-acrylamido-acetate and dimethyl diallyl ammonium chloride with acrylamide had been prepared by free radical polymerization using (NH4)2S2O8 and NaHSO3 as the free radical initiator in water solution.

本论文首先以氨基乙酸和丙烯酰氯为原料制备丙烯酰胺基乙酸钠单体，然后以丙烯院胺丙烯酰胺基乙酸钠和二甲基二烯丙基氯化铵为单体，(NH4)2S2O8和NaHSO3为自由基引发剂，采用水溶液聚合法合成丙烯酰胺／丙烯既胺基乙酸钠／二甲基二烯丙基氯化铵共聚物。

Methods: 1. Male Sprague-Dawley rats were established renal calcium oxalate calculi model. 2. The different dose of LBP, medlar soak and apozem was given. The calcium oxalate crystallization, the renal cell apoptosis and the renal free radical level were detected. 3. The relationship of the renal cell apoptosis index, the renal free radical level and the calcium oxalate crystallization grade in the kidney tubule was determined.

1、给大鼠建立肾草酸钙结石模型；2、予以不同剂量的枸杞多糖，不同浓度的枸杞浸泡剂和煎剂灌喂，比较肾小管内草酸钙结晶的形成，测定肾小管上皮细胞的凋亡指数，自由基水平；3、分析结晶等级评分、细胞凋亡指数和自由基的相互关系，判断枸杞多糖预防肾草酸钙结石的作用机制和效果。

The total contents of phenol compounds of fresh Boehmeria nivea root was 200.24± 0.93 mg/g, which is 4.5 times higher than ethanol extracts of fresh Boehmeria nivea leaf, and its ability to remove ABTS free radical is 7.4 times higher than that of fresh Boehmeria nivea leaf, which is one third of Trolox's ability to remove free radical. Antioxidant components of hot water extracts of Boehmeria nivea leaf exhibited 55 and 67% lower than that of fresh leaf respectively.

sulfonic acid］和DPPH(α，α-diphenyl-β-picrylhydrazyl)自由基为最高，其次为热水萃取物和冷水萃取物，而新鲜苎麻根乙醇萃取物总酚类含量为200.24 ±0.93 mg/g，约高於新鲜苎麻叶乙醇萃取物的4.5倍，其清除ABTS自由基能力是新鲜苎麻叶乙醇萃取物的7.4倍，约为维生素衍生物的1/3倍。

For the DPPH free radical scavenging, their EC50 values are 19.05 mg/ml and 15.61 mg/ml respectively, but their anti-oxidant capacities are 40 to 60 % higher than fresh ones. Hot water extracts of Boehmeria nivea root experienced sun dry treatment have a better ability to scavenging ABTS free radical (EC50=34.16 μg/ml)when compared to that of fresh root, which only have one tenth anti-oxidant ability left.

经冷冻乾燥和日晒乾燥的苎麻叶热水萃取物其抗氧化成分较新鲜者低约55至67 %，而对DPPH自由基清除能力其EC50分别为19.05 mg/ml和15.61 mg/ml，相对其抗氧化能力却较新鲜者为高约40至60%；经日晒乾燥苎麻根热水萃取物其清除ABTS自由基能力(EC50=34.16 μg/ml)明显较新鲜者为高，显示其清除自由基能力只剩1/10。

The first part of this research was to investigate anti-oxidant abilities of Boehmeria nivea leaf and root. Different extraction methods, drying conditions as well as far infrared were applied to measure their effects on anti-oxidant abilities of Boehmeria nivea leaf and root. Results showed that 95% ethanol extracts of fresh leaves and roots demonstrate the highest anti-oxidant components(total contents of phenol compounds and flavonoids)and scavenging abilities free radical scavengingABTS(2,2'-azinobis［3-ethylbenzothiazoline-6- sulfonic acid］and DPPH (α,α-diphenyl-β-picrylhydrazyl) free radical , followed by hot water and cold water extraction.

本研究第一部份拟针对苎麻叶与根探讨其抗氧化能力，并以不同萃取方法、不同乾燥处理方式及经远红外线照射对其抗氧化能力之影响，研究结果显示，在不同萃取方法中，新鲜苎麻叶与根皆以95%乙醇萃取物的抗氧化成分及抗氧化能力清除ABTS(2，2'-azinobis［3-ethylben-zothiazo-line-6

The experiments for determining the mechanism and kinetics of catalytic pyrolysis reaction for a simple petroleum feedstock, were carried out in a batch micro-reactor using Daqing light gas oil. The results showed that carbonium and free radical reactions were the key reactions in catalytic pyrolysis. The carbonium ions were induced by catalytic reaction, whereas free radical reaction was predominantly due to thermal cracking.

首先在重油微反装置上考察大庆减压馏分油催化裂解反应产品分布，并将反应结果与相同温度范围内的热裂解反应相比较，二者的产品分布随温度等操作参数的变化规律明显不同，进而推断催化裂解反应过程为正碳离子反应机理和自由基反应机理并存；并建立了大庆减压馏分油催化裂解消失动力学模型，求得了化学反应速率常数。

In order to understand antioxidant enzymes activities in response to temperature increment and the active oxygen free radical clearing function of antioxidant enzymes in antarctic ice mircoralgae Chlorophyceae L4, the free radical generation rate, the malonaldehyde content changes and the corresponding antioxidant enzymes activities changes in Chlorophyceae L4 at different temperatures were determined.

为了阐明南极冰藻Chlorophyceae L4抗氧化酶活性对温度升高的响应以及了解冰藻细胞内抗氧化酶系统对活性氧自由基的清除作用，对不同温度下（包括最适温度6℃、高于最适温度10℃和15℃）Chlorophyceae L4细胞中自由基的产生速率、丙二醛含量的变化和相应的抗氧化酶系统活性的变化进行了测定。

The more the number of hydroxyl substitution in phenyl ring, the better the ability of scavenging DPPH free radical. That is, trihydroxy is better than dihydroxy, and dihydroxy is better than monohydroxy. Moreover, when the polyhydroxy exists in phenyl ring and it is ortho-position or para-position, the ability of scavenging DPPH free radical is better too.

当苯甲醯基的苯环上羟基取代数量越多，其清除DPPH自由基的能力越好，三羟基效果优於双羟基、单羟基，双羟基效果优於单羟基；而苯甲醯基苯环上若为多羟基且羟基的位置为邻位或对位的关系时，其在清除DPPH自由基的能力较佳。

Objective: In order to investigate the relationship among microbiotic antioxidant、free radical metabolism and reproductive ability, to discuss free radical metabolism influence the body growth as well as the development of organs.

目的：本试验通过微生物源性抗氧化剂和LPS对机体自由基代谢水平进行调控，研究微生物源性抗氧化剂、自由基代谢和机体繁殖性能的关系，探讨自由基水平对机体的生长发育、器官发育以及性发育等的影响，从而实现通过营养调控技术提高机体的繁殖性能。

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。