查询词典 free radical

Keywords Pulse radiolysis, Antioxidant, Kinetics, Free radical

等也会通过直接或间接作用产生活性氧自由基。

Barley Grass Fiber contains pineapple enzyme and enzymes sourced from the barley grass powder.Enzymes are the catalysts for the body's essential chemical reactions and are responsible for our digestive processes that provides cellular energy and for antioxidant effects that offers a natural therapy for rejuvenation with cell protection against free radical.

大麦纤维素富含的菠萝酵素及其他源自大麦草粉酵素是消化过程的是消化反应主要的催化剂，它负责将人体消化过程中输送转化成的能量至细胞组织，促形成保护免受自由基对细胞氧化的作用，提供了人体美颜抗老的自然疗法。

Studies of the effect of various active oxygen quenchers on HC-B Photosensitized oxidation of bilirubin indicated that in serum both free radical reactions and singlet oxygen reaction seem to occur simutanously.

比较在不同溶剂中各种活性氧淬灭剂对胆红素光氧化的抑制作用，指出血清胆红素光敏氧化反应包括自由基氧化反应和单态氧氧化反应等多重机制。

In our research, through derivatization of stable calix[4]pyrroles, active substituting units were jointed on the calixpyrrolic skelecton. After acylamide and free radical transfer reaction, the preparation of new calix[4]pyrrole-bonded stationary phases were fulfilled. the separation abilities of them to inorganic and organic anions and medicines were exploited and new analytical methods were established. The separation mechanisms were discussed. At the same time, through using calix[4]pyrroles as additives in CZE to influence the electrophoresis of inorganic anions, the recognition mechanisms and influencing factors in supramolecular chemistry were also studied.

本项目以新型杯吡咯大环化合物分子识别化学研究为基础，设计合成了含活泼取代基的官能化杯[4]吡咯化合物，通过酰胺化反应和原位自由基链转移反应制备了新型的杯[4]吡咯色谱固定相，系统研究了具有阴离子识别功能的杯[4]吡咯大环化合物作为离子色谱的分离介质对无机、有机离子型化合物和药物分子的色谱分离性能，建立了新的分析方法，对分离机理进行了探索和验证；同时将杯[4]吡咯化合物用作毛细管电泳流动相添加剂，利用其对无机阴离子电泳行为的影响探讨超分子化学中分子识别的机理和影响因素。

DMSO, an effective free radical scavenger, was used to treat the planarians before or after the paraquat treatment.

游离氧自由基清除剂DMSO被用来在百草枯处理前或后处理涡虫。

Using free radical 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxyl as catalyst, the phase transfer catalyzed method of oxidation of anilines to 15 symmetrical azobenzenes with a saturated solution of potassium ferricyanide in 2N aqueous potassium hydroxide and dichloromethane was described for the first time.

用2，2，6，6-四甲基-4-羟基-1-哌啶氮氧自由基为催化剂，芳胺类化合物在饱和铁氰化钾的氢氧化钾溶液和二氯甲烷的两相转移催化下合成了15 个对称取代偶氮苯。

The structures were identified by IR, UV,〓 NMR and element analyses. 2. Free radical 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxyl as catalyst, the phase transfer catalyzed method of oxidation eighteen semicarbazides to N-Aryl-2-Phenyl diazenecarboxamide with a solution of potassium ferricyanide in 2N aqueous sodium hydroxide and dichloromethane is described for the first time.

利用2，2，6，6-四甲基-4-羟基-1-哌啶氮氧自由基为相转移催化剂，在饱和铁氰化钾的2N氢氧化钠溶液与二氯甲烷的两相反应液中，催化氧化十八个取代氨基脲得到十八个相应的新型偶氮化合物N，2-二芳基二氮亚烯甲酰胺，均获得了较高的产率。

Objective: To study change of free radical of corpora cavernosum peni tissues in experimental diabetic rats.

目的：通过体内实验，探讨实验性糖尿病大鼠阴茎海绵体组织自由基变化。

The results indicated that the accumulation of Mn in the cell wall (accumulation rate as high as 36.34%) and the vacuole of the leaves (accumulation rate as high as 65.64%) might be one of the mechanisms of tolerance and hyperaccumulation of Polygonum hydropiper to Mn. Most Mn in leaves were the speciation of H2O-solubility organic salts or manganese oxalates. The content of chlorophyll a did not change under different Mn concentration treatments except that its content decreased remarkably when Mn concentration was 8000μmol/L in solutions. The membranes were not banned by Mn when its concentration was less than 5000μmol/L in solutions; Under different Mn concentrations of Mn, the content of their soluble proteins of leaves had changed at some stage. The activity of SOD and POD were gradually improved with the increasing of Mn concentration, which could eliminate activated oxygen free radical, This might be the other physiological mechanism of tolerance and hyperaccumulation of Polygonum hydropiper responding to Mn.

结果表明：锰在水蓼叶片非活性代谢部分的积累是其解毒耐锰的主要机制之一；水蓼叶片中的锰大部分以水溶性有机盐或草酸锰的形态存在；在锰浓度处理为8000μmol/L时，叶绿素a含量显著降低，而在其它处理条件下，叶绿素a无明显变化；在锰处理≤5000μmol/L时水蓼叶片的细胞膜还没有受到明显伤害；水蓼叶片的可溶性蛋白含量随锰处理浓度不同而变化，说明植物在代谢和结构上发生了调整；随锰处理浓度的增加，水蓼叶片SOD和POD活性提高，保护酶活性的提高又可清除活性氧自由基，这是水蓼耐高锰和累积锰的一种生理响应机制。

And the Honeysuckle's leaves extracts have hydroxy free radical scavenging effects as well. The re-extract by ethyl acetate has obviously scavenging activity when its concentration is 1 mg/mL.

抗氧化实验结果表明，金银花叶乙醇提取物具有一定的抗羟自由基氧化活性，其中乙酸乙酯萃取物在1mg/mL的低浓度下就显示出了较好的效果。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。