氧化还原

By series of in vitro tests, including DPPH radicals and hydroxyl radicals scavenging activity assays, reducing power test, anti-superoxide radicals assay, anti-human low density lipoprotein oxidation test, protections against hydroxyl radical- mediated DNA damages and peroxynitrite medialed dihydrohodamine oxidation, it was showed that TIs exhibited antioxidant and antiradical activities compared with positive controls.

藉由一系列抗氧化DHR123活性试验，如清除DPPH自由基、清除hydroxyl自由基、还原力的测定、清除超氧自由基的测定、抗低密度脂蛋白氧化、抑制peroxynitrite氧化和保护DNA氧化等研究，都显示TIs具有抗氧化活性。

IV. The total synthesis of dehydrodiconiferyl alcohol and its dihydro-derivative The benzofuran skeleton was constructed by chemically oxidative couplingstarting from vanillin, then selective reduction with LiAI〓/〓 andhydrogenation in the presence of Pd-C followed reduction with LiAl〓respectively, to give dehydrodiconideryl alcohol and its dihydro-derivative, usefulin treating and preventing digestive system disorders, esp.

四、Dehydrodiconiferyl alcohol及其二氢衍生物的全合成以香草醛为起始原料，用化学氧化法一步建立氢化苯骈呋喃骨架，LiAlH〓／〓选择性还原以及催化加氢还原接着〓还原，分别合成了对预防和治疗消化系统疾病尤其是胃溃疡有显著效果的Dehydrodiconiferylalcohol及其二氢衍生物。

In order to understand the mechanism of anti-inflammatory effect of PA and carvacrol, the superoxide dismutase, glutahoine reductase, glutahoine peroxidase activities in liver and malondialdehyde , cyclooxygenase 2 (COX-2), tumor necrosis factor-α levels were eveluated. Also observed inducible nitric oxide synthase and cyclooxygenase-2 (COX-2) expression and the pathological histology in λ-carrageenan induced paw edema in mice.

本研究首先以醋酸扭体试验评估左手香水抽提物及其活性成分香芹酚是否具有镇痛效果，以福马林舔足试验辨别其镇痛作用是在周边或是中枢，再以λ-角叉菜胶诱导小鼠足跖肿胀试验探讨其抗发炎作用，并分析其肝脏组织中的超氧歧化酶、麸胱甘肽还原酶、麸胱甘肽过氧化酶活性、发炎足跖组织中的脂质过氧化指标产物丙二醛、肿瘤坏死因子-α及环氧化酶-2之含量变化，观察诱导型一氧化氮合成酶及环氧化酶-2之蛋白质表现量，并将肿胀足跖做病理切片观察之，以探讨左手香水抽提物及香芹酚之抗发炎机转。

Total phenolic content and reducing power were determined using the Folin-Ciocalteu and the potassium ferricyanide reduction methods, respectively. Statistical analysis indicated a close association between the antioxidant potency and total phenolic content, and between the antioxidant potency and reducing power as well.

酚的含量和还原能力分别用福林酚试剂和铁氰化钾还原反应来测定，统计分析显示两种蚂蚁窝的抗氧化能力和其酚含量、还原能力都存在着正相关。

He hypothesis has been proved by SEM and TEM. The characterization of TPR and XPS showed that there had reduction process of oxide species before crystallization, and the reduced species and metalloid content increased generally on the surface of catalysts.

PR和XPS表征证实在负载型非晶态合金Ni-P/TiO〓的晶化温度前，有金属氧化物种的还原过程，还原后，催化剂表面的还原态物种增多，类金属相对含量普遍增加。

After As in WO3 is dissolved with NaOH solution, WO3 is coordinated by citric acid. In HCl medium, As is reduced to lwo valency As by KI and then low valency Asis reduced to gas AsH3 by SnO2 and metal Zn. After that, DDTC-Ag solution is applled as absorbent for colorimetric determinhtion.

用氢氧化钠溶液溶出三氧化钨中的砷之后以柠檬酸配位三氧化钨，在盐酸介质中用碘化钾将砷还原成低价砷，再用二氯化锡和金属锌将低价砷还原成砷化氢气体，以DDTC-Ag溶液吸收进行比色测定。

The synthesis of alkylcyclohexylbenzoic acid: take the synthesis of ethylcyclohexylbenzoic acid as a typical example. With the AlCl3 as the catalyst, cis+trans acetylcyclohexylbenzene is synthesized from the reaction of acetyl chloride, cyclohexene and benzene.

烷基环己基苯甲酸的合成研究：主要研究了乙基环己基苯甲酸的合成，以乙酰氯、环己烯、苯为原料，三氯化铝为催化剂，合成乙酰基环己基苯，用水合肼、氢氧化钾、一缩二乙二醇经过高温加热还原羰基(Wolff-黄鸣龙还原)，将所得到的乙基环己基苯用乙酰氯进行傅克酰基化得到乙基环己基苯乙酮，所得中间体经过处理之后直接得到反式产物，将反式异构体的乙酰基氧化得到反式烷基环己基苯甲酸。

Papers in the experimental part of our literature considered on the basis of the experimental exploration, and podophyllotoxin intermediates with the structural characteristics of a simple pepper aldehyde as the starting material,α,β-unsaturated carbonyl compounds are selective reduction lithium aluminum hydrogen reduction reaction as the key steps to have the Knoevenagel condensation, peracetic acid epoxy between chlorine and alkaline hydrogen peroxide epoxy, DCC condensation esterification reaction of the three podophyllotoxin intermediates.

论文实验部分我们在综合考虑文献的基础上，经过实验摸索，并结合鬼臼毒素中间体的结构特点以简单的胡椒醛为起始原料，对α，β-不饱和羰基化合物具有选择性还原的锂铝氢还原反应为关键步骤，先后经过Knoevenagel缩合，间氯过氧苯甲酸环氧化，碱性过氧化氢环氧化，DCC缩合酯化等反应合成了3个鬼臼毒素中间体。

In flotation pulp, local cell was present in sulfide particles-water system, sulfide particles-modifer-water system, sulfide particles-collector-water system and grinding medium-water system; Galvanic coupling did in mineral-mineral interaction and mineral-grinding medium interaction, the material of higher potential acted as a cathode , and the lower as an anode.

在磨矿—浮选矿浆中产生的局部电池包括硫化矿物颗粒在水体系、调整剂体系、捕收剂体系和磨矿介质在水体系中的阳极氧化以及氧在同一固体表面上的阴极还原；在磨矿—浮选矿浆中的迦伐尼电偶则存在于硫化矿物—硫化矿物、硫化矿物—磨矿介质之间，其中静电位低的物质发生阳极氧化，氧在具有高静电位的阴极钝化物质上还原。

The results showed that Cd and Zn mainly occurred in the fractions extracted by BCR method, namely, weak soluble fraction, reducible fraction and oxidisable fraction, which were 35.0%, 49.7 and 12.9% for Cd, 17.6%, 16.6% and 21.4% for Zn, respectively, in surface sediment.

结果表明，表层沉积物中的Cd和Zn主要以可提取态（即弱酸溶解态、可还原态和可氧化态）存在，其中，Cd在弱酸溶解态、可还原态和可氧化态中的含量分别为35.0%、49.7%和12.9%；Zn在三者中的含量也分别达到了17.6%、16.6%和21.4%。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。