氧化还原

Comparing it with the standard electrode potential of nitric acid,the reason of dissolution of HgS in aqua regia was quantitatively revealed,and this is that the high concentration of chloride ions reduces the reduction potential of sulfur in HgS,thus raising the reducing power of HgS rather than that the oxidizing power.

根据热力学平衡原理和设计的可逆电池反应，由 E~0Hg~(2++S/HgS数据，计算了 E~0HgCl_4~(2++S/HgS+4Cl~-数值，将其与 HNO_3的标准电极电位比较，定量地揭示了 HgS 溶于王水的原因在于该溶液中高浓度 Cl~-离子降低了 HgS 中硫的还原电位，从而提高了 HgS 的还原性所致，并非王水的氧化性比 HNO_3的更强。

The catalyst shows good activity for the oxidation of toluene, acetone and ethyl acetate.

研究了阳极氧化的电流密度和电解液种类等因素对阳极氧化膜形成的影响，以及还原时间和焙烧温度对催化剂氧化活性的影响。

Methods The DNA injury was determined with single cell gel electrophoresis, the contents of NO and NOS were measured by NO and NOS kits respectively and apoptosis of lymphocytes was determined by flow cytometry and gelose electrophoresis.

建立硫芥中毒淋巴细胞模型，分别用单细胞凝胶电泳法检测淋巴细胞DNA损伤；用镀铜镉还原法和一氧化氮合成酶试剂盒检测中毒后淋巴细胞培养上清液一氧化氮和一氧化氮合酶的变化；用流式细胞仪和琼脂糖凝胶电泳法检测细胞凋亡。

The results indicated that the water or 50% ethanol extracts from peonies petals could reduce light absorption of DPPH and OH initiated hydroxylation of salicylate, and inhibit O2(superscript -) mediated light chemical reduction of nitroblue tetrazolium effectively, and lipid peroxidation of polyunsaturated fatty from yolk lipoprotein, in which DPPH scavenging activities of 6 peonies water extracts were hinger than that of 200 μg/mL BHT, but lower than 80 μg/mL Vc. In 4 kinds of detecting systems of antioxidation, the peroxidation activity of deep colored flowers of peonies was higher than that of light colored flowers of peonies.

牡丹花瓣提取液能明显抑制卵黄组织匀浆的脂质过氧化作用，降低DPPH的吸光值、抑制O2介导的NBT光化学还原及OH作用下的水杨酸羟基化作用，其中牡丹花瓣提取液清除DPPH自由基的活性高于200μg/mL BHT，但低于80μg/mL Vc.6个品种的牡丹花瓣提取液，在4种测定系统中均具有一定程度的抗氧化能力，且水提取液的抗氧化活性略高于体积分数50%乙醇提取液，深色花瓣提取液对不同自由基的清除能力较强。

The aim of this study was to examine the possible antioxidant and antiproliferative activities of the ethanol and water extracts of four Hydrocotyle species from Taiwan. ABTS radical monocation scavenging, FRAP method, DPPH radical scavenging, reducing power method, total polyphenol content, total The results showed that the water extracts of all the samples had higher antioxidant and antiproliferative activities than the ethanol extracts.

本实验针对台湾产四种天胡荽属植物之水萃取物及乙醇萃取物进行抗氧化及抗增生活性研究，分析方法包括ABTS自由基的清除、FRAP方法、DPPH自由基的清除、还原力、总多酚类含量、总类黄酮类含量、总黄酮醇类含量以及癌细胞增生之抑制，结果显示所有样品的水萃取物之抗氧化及抗增生活性皆大於乙醇萃取物，但在抗氧化活性方面，所有受测样品活性皆小於正对照组。

After 24 hours, all rats were anesthetized again and their left common carotid arteries were cannulated to facilitate blood withdrawal for serum sample. The contents of tumor necrosis factor-a and interleukin-6 (IL-6) in serum were determined before and after experiment by ELISA; the activity of superoxide dismutase and content of malondialdehyde were determined by xanthinoxidanse method and modified TBA microdetermination. The content of NO2(superscript -)/NO3(superscript -), and activity of nitric oxide synthase and inducible NOS were determined by nitrate reductase method, and chemical chromogenic reaction, respectively; the immunoglobulin G, IgA, IgM and complement 3 (C3) and C4 were determined by immunoprecipitation method before and after experiment.

实验评估：手术创伤后24h进行采用酶联免疫吸附法测定实验前后血清肿瘤坏死因子α、白细胞介素6含量；应用黄嘌呤氧化酶法测定超氧化物歧化酶活性、改良TBA微量法测定丙二醛水平；以硝酸还原酶法、化学显色法分别检测NO2/NO3浓度及一氧化氮合酶、诱导型一氧化氮合酶活胜；以免疫比浊法经全自动生化分析仪检测血清免疫球蛋白IgG、IgM、IgA及补体C3、C4含量。

The behaviour of oxygen in the reoxidation process was investigated by an oxygen coulometry.

结果表明；氧流量计在升温阶段检测到三个不同行为的吸氧峰，峰Ⅰ（起始温度-250℃）为氧空位的填充过程；峰Ⅱ（起始温度-800℃）和峰Ⅲ（起始温度-1250℃）为还原相的氧化过程，具体来说，峰Ⅱ是通过晶界扩散提供氧使靠近晶界附近的区域被氧化；而峰Ⅲ是由晶格扩散过程控制，氧化过程从晶界逐渐向晶粒内部区域扩展，并伴随着富Ti的Ba6Ti17O40相的沉淀。

In order to explain the phenomenon, the process of activation sulfurization of LaCoO 3 in the presence of oxygen was studied by XPS, XRD and TEM methods.

在氧化气氛下预处理会产生更多的阳离子空位，从而使其CO高温氧化活性明显升高；在还原气氛下预处理会产生更多的氧离子缺陷，从而使其CO低温氧化活性明显升高[1] 。

The paper studied the scavenging active oxygen radicals of brown pigment from chestnut shell. The results showed that the brown pigment had scavenging effects on hydroxyl radical, superoxide anion radical and aliphatic radicals on lipid-peroxidation. In the range of test concentration, the maximum scavenging or inhibition rate of the brown pigment to hydroxyl radical generated by Fenton reaction, superoxide anion radical generated by illuminating riboflavin system and linoleic acid auto-oxidation was 83.0%, 82.1% and 88.5% respectively.

从清除羟基自由基和超氧阴离子自由基、抗脂质过氧化以及还原能力等方面对板栗壳棕色素的抗活性氧自由基进行了试验研究和评价，结果表明：板栗壳棕色素对Fenton反应产生的羟基自由基和光照核黄素产生的超氧阴离子自由基均具有较强清除作用，对脂质过氧化过程中产生的脂自由基和脂过氧化自由基有明显的抑制作用，且在试验浓度范围内，其最大清除率或抑制率分别可达到83.0%、82.1%和88.5%。

The experimental results show that the lead sulphate, which is formed by reducing lead dioxide, can be reoxidized to lead dioxide within 1min at 1.4V.

实验结果表明在0.9V还原二氧化铅而得到的硫酸铅能在1.4V于1min内氧化为二氧化铅。

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。