羟自由基

The theory about electromotion effect on the interface between gas and water, formation of ion wind during corona discharge and double film absorption is used to explain the effect of simultaneously desulfuration and denitration in the gas and water phases.

在汇总和分析了羟自由基的测定方法的基础上，以产生羟自由基的Fenton 反应为研究对象，建立了以溴酚蓝为显色剂的基于比色法的放电条件下羟自由基测定体系，实验证明电晕放电下水中产生的羟自由基强化了烟气中的脱硫脱硝效果。

In this paper the thymus DNA of calf and the pBs plasmid are the main objects of our studies in ultraweak luminescence. By means of PIAS(Photon-counting image acquisition), ultraweak luminescence detector and Lambda Bio 40 of UV/VIS spectrophotometer, we studied the UL of DNA induced by the three oxygen free radicals: singlet oxygen Oa, hydroxy radical and superoxide anion(O2 ). We found that the OH can greatly increase the UL intensity of DNA.

本论文以小牛胸腺DNA和质粒pBs为实验材料，利用光子图像探测系统(Photon-counting image acquistion，PIAS)、微弱发光测量仪和UV／VIS分光光度计和生物统计学的成组比较法原理对单线态氧(~1O_2)、羟自由基、超氧阴离子(O_2~-)三种氧自由基诱导DNA超弱发光的变化过程进行了研究，结果发现这三种氧自由基中·OH能诱导DNA的超弱发光发生显著的增强变化，而其他两种氧自由基对DNA的超弱发光并无显著诱导作用。

In order to research the mechanism and effect of hydrodynamic cavitational enhancement, find the basic rule which affected it. The work has been carried out as following.First, an effective equipment of hydrodynamic cavitition is built. Second, we find a new method to capture the free radicals, which is used to measure the amount of hydroxyl. And its correlation with the intensity of cavitation has been studied aims at analyzing the effect of various factors on the yield of hydroxyl, achieving the optimum hydrodynamic cavitation conditions. Then, hydrodynamic cavitation is used to the degradation of organic wastewaters containing rhodamine B, and sterilization of biologic wastewaters containing enterobacter aerogenes. Finally, numerical simulation based on computer fluid dynamic has been made for verifying the effect of hydrodynamic cavitation theoretically.

为了探求水力空化强化效应的机制和效果，寻求影响空化强化效应的基本规律，本论文就此开展了如下研究工作：设计建立实用有效的水力空化实验装置；建立空化自由基捕捉新方法，并以此定量检测水力空化羟自由基，研究空化羟自由基产量与空化强度的关系，研究各种因素对空化自由基产量的影响，以寻求最佳空化强化条件；在此基础上，进行了水力空化对含罗丹明B有机废水降解处理、对含产气肠杆菌生物污水杀菌处理研究，实验检验水力空化的强化效果；根据计算流体力学理论对空化流场进行数值模拟，从理论上验证水力空化的发生效果。

The free radical scavenging properties of six Aloe species are to be investigated in some modified chemical system. The antioxidant was purified by silica column and thin layer chromatography and analyzed by HPLC. A fraction was purified from A. brevifolia Mill showed the most effective scavenging activities on 〓 and ·OH (66. 01% and 38. 98% respectively). With the analysis of IR spectrum, UV spectrum and mass spectrum, the structure of FA was identifed as 8-C-D-glucopyranosyl-2- [2-hydroxy] propyl-5-methyl-7-hydroxychromone. Its scavenging activity on free radicals is higher than that of aloe-emodin. Its antioxidant activity may be due to the phenoxyl on glucosyl chromone which can be react with free radicals and form relatively stable free radicals.

本研究利用分别产生超氧阴离子自由基和羟自由基的化学模型体系研究比较了不同品种芦荟提取物的清除活性氧自由基的抗氧化作用，进一步利用硅胶柱结合薄层层析法和反相高压液相色谱法，从短叶芦荟叶子中首次分离了具有较强自由基清除能力（超氧阴离子自由基和羟自由基清除率分别为66.01％和38.98％）的成分FA，利用红外光谱、紫外光谱和质谱等仪器分析结果推断出该活性成分的分子结构为8-C-吡喃葡萄糖-2-[2-羟基]-丙基-5-甲基-7-羟基对氧萘酮，它的自由基清除能力高于芦荟大黄素，是一种天然抗氧化剂。

The elimination effects of five kinds of grape wines were studied and compared by spectrophotography.

利用Fenton反应产生羟自由基，用分光光度法测定了5种葡萄酒对羟自由基的清除作用。

And hydroxyl free radical in the methanol extract of Valeriana offeinalis L . ResultsThe half maximal inhibitory concentration(IC50) of sample on DPPH.

结果样品中活性物质对于DPPH自由基、超氧阴离子自由基、羟自由基等自由基半清除率浓度(IC50)分别为1.36，1.46和2.14 mg/ml。

Fenton reaction was used to produce hydroxyl free radical, Rhodamine B was used as fluorescence indicator, and the detection solution is phosphate salt buffer. The measurement system was set up to measure the effects of nanose scavenging hydroxyl free radical.

Fenton反应产生稳定羟自由基，罗丹明B为荧光指示剂，磷酸盐缓冲液中检测了纳米硒清除羟自由基的效果。

Asindicated by the formation of HOTA,the"OH"generated by the Fenton-type reactioncatalyzed by copper ion is different from that generated radiolytic,the former is ratherlocalized and therefore difficult to be scavenged by TA.

对铜催化的类Fenton反应的研究表明，类Fenton反应产生的&羟自由基&与水辐解产生的羟自由基不同，不能被对苯二甲酸全部清除。

In this experiment the seven tea varieties were dealt with the drought in the planting base of Tea Research Institute of Chongqing .The activity of SOD,POD and the quantity of ?OH were mensurated in the tea mature leaf, and the contrastive and dynamic analyse were carried .It is clear that the changers of activity of SOD,POD have a trend of first increase and following decrease in drought stress.

通过对重庆市茶叶研究所基地种植的7个茶叶品种干旱胁迫下叶片中的超氧化物歧化酶酶活性、过氧化物酶酶活性及体内羟自由基含量的对比试验和动态分析，表明SOD和POD在干旱胁迫下，均表现出&先升后降&的变化趋势，茶树体内羟自由基含量则随干旱胁迫的进程而增加。

The hydroxyl radical scavenging effects of safflower yellow, gardeniayellow, red radish color, purple sweet-potato red color and redcabbage color were detected in vitro with fluorescence spectrophotometry, andthe results make sure that all of the five pigments have some scavenging effects on thehydroxyl radical, though each pigment didn't have the same change trend.

用荧光分光光度法检测红花黄色素、栀子黄色素、红萝卜色素、紫甘薯色素、紫甘蓝色素等五种色素体外清除羟自由基的作用，结果证实SY、GY、RRC、PSPRC、RCC等五种色素对羟自由基都有一定的清除作用，每种色素的变化趋势不完全相同。

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。