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活性氧对
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  active compounds of oxygen
     The results showed that the Misgurnus anguillicaudatus polysaccharide could efficiently remove O·[DD(-2;-2]-2,·OH, H 2O 2 and other active compounds of oxygen and significantly protected DNA chains from being damaged by free radicals.
     结果表明 ,泥鳅多糖能够有效地清除O·-2 、·OH、H2 O2 等活性氧 ,对DNA链具有良好的保护作用
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  “活性氧对”译为未确定词的双语例句
     The damages of membrane proteins and DNA, mitochondrial function, activation of NF κB and expression of IL 6 were studied.
     分析活性氧对细胞膜蛋白和DNA的损伤 ,细胞线粒体功能变化 ,白介素 6 (IL 6 )的表达变化以及细胞核因子κB(NF κB)的激活 .
短句来源
     Antioxidants reverse high-glucose's effect on p21~(Waf1) expression in human peritoneal mesothelial cells
     高糖与活性氧对人腹膜间皮细胞p21~(Waf1)表达的影响
短句来源
     Effect of reactive oxygen species on the growth and apoptosis-related gene expression in ECV304 cells
     活性氧对ECV304细胞生长和凋亡的相关基因表达谱研究
短句来源
     Role of Reactive Oxygen Species in the Gene Expression of ECV304 Proliferation
     活性氧对ECV304细胞增殖作用的相关基因表达谱研究
短句来源
     Effect of Reactive Oxygen Species on α-amylase Expression of Germinating Wheat Embryo Treated with ABA and Water Stress
     活性氧对ABA和水分胁迫抑制的小麦萌发胚内α-淀粉酶表达的影响
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  相似匹配句对
     reactive oxygen species
     活性
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     Oxidative Damage of Active Oxygen on Biomacromolecules
     活性生物大分子的化性损伤
短句来源
     Reactive oxygen species in regulation of hypoxia-inducible factor
     活性诱导因子的调节
短句来源
     The Tudie on the Injure of Cytochrome C and Myoglobin by Active Oxygen Radical
     活性自由基细胞色素C和肌红蛋白的作用
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     Effects of Strong Light and Active Oxygen on Photosynthesis in Soybean 
     强光及活性大豆光合作用的影响
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Two Anabaena mutants having heterocysts but incapable of fixing molecular nitrogen in air have been isolated by using ultraviolet radiation or NTG mutagenesis. Their vegetative cells differentiated into heterocysts at a higher frequency than that of the wild type.The phenotype of the mutants is stable and a low frequence of spontaneous reversion was observed. Under microaerobic condition the mutants cells can express the genetic informa- tion which encodes nitrogenase synthesis and were capable of utilizing...

Two Anabaena mutants having heterocysts but incapable of fixing molecular nitrogen in air have been isolated by using ultraviolet radiation or NTG mutagenesis. Their vegetative cells differentiated into heterocysts at a higher frequency than that of the wild type.The phenotype of the mutants is stable and a low frequence of spontaneous reversion was observed. Under microaerobic condition the mutants cells can express the genetic informa- tion which encodes nitrogenase synthesis and were capable of utilizing nitrogen for growth with a low acetylene reduction activity.The level of nitrogenase activity was correlated reciprocally with the content of cell phycocyanin and the light intensity. Both synthesis and activity of the mutant nitrogenase were very sensitive than wild type to the oxygen in vivo.Introduction of 1% O_2(v/v)into the gas phase inhibited evidently acetylene reduction.Exposure of the mutant suspension to 20% O_2(v/v) resulted in total and irreversible denaturation of nitrogenase.Withdrawing of O_2 in gas phase,the nitrogenase was synthesized de novo;The synthesis process was repressed by chloramphenical or ammonia. The nitrogenase activity of mutant cells increased significantly either by nitrogen- starvating to decrease the phycocyanin content or by lowering the light intensity. Specifically,during the anaerobic induction by treating the mutants filaments with dichloromethylurea which prevents photosynthetic oxygen production,the specific activity of mutant nitrogenase was equivalent nearly to that of wild type.The ability to reduce 2,3,5-triphenyltetrazolium was lower in heterocysts and vegetative cells of mutants than in that of wild type. The results suggest that the oxygen sensitivity of nitrogen fixation by heterocys- tous blue-green algal mutants may be due to the defect of some enzymic systems which might play a role in scavenging oxygen toxity,so that the process of nitrogen fixation is inhibited by the active oxygen produced by vegetative cells.The mechanism of protecting nitrogenase from oxygen damage in blue-green algae is discussed.

用紫外线和亚硝基胍,诱变筛选出两株具异形胞而不能在空气中固定分子氮的鱼腥藻Anabaena)突变种。突变表型是稳定的。在微氧条件下,能固定分子氮而生长,但固氮酶活很弱。酶活的高低与藻蓝素含量和光照强度成反相关。突变种细胞的固氮酶对氧非常敏感,反应气相中加入1%的氧对乙炔还原活力已有明显抑制,20%的氧完全阻抑固氮作用。除去氧后固氮酶重新合成,其过程受 NH_4~+和氯霉素阻遏。通过氮饥饿使藻蓝素含量降低,或降低光照强度,或加入二氯苯基甲基脲抑制光合放氧时,均可显著地提高突变种的固氮酶活力。突变种细胞还原氯代三苯四氮唑为甲(?)结晶的能力低于野生种。暗示突变种固氮对氧敏感,可能是由于细胞中清除氧的酶系统有缺损,以致营养细胞产生的活性氧对其本身固氮过程有抑制作用。

The effect of 3,4-dihydroxyddacetophenone on hemolysis of erythrocytes induced by active oxygen radicals is presented. When erythrocytes were exposed to active oxygen generated in vitro, hemoglobin was broken down, lipids were peroxidated and hemolysis occured. These reactions were inhibited by 3,4-dihydroxyacetophenone. The results showed that 3,4-dihydroxyacetophenone might act as a scavenger of superoxide and hydroxy radical and might be used as an antioxidant.

本文以活性氧对红细胞的氧化作用,探讨青心酮的抗氧化作用。体外实验表明,青心酮有抗超氧化物阴离子自由基及羟基自由基对Hb的氧化作用;减少羟基自由基及过氧化氢引起红细胞溶血和脂质过氧化反应。并发现青心酮有清除超氧化物阴离子自由基及羟基自由基的功能,阻止活性氧对红细胞氧化。

ADP-FeCl_3-xanthine-xanthine oxidase system was capable to induce the peroxidation of lecithin liposome,but addition of superoxide dismutase or catalase significantly inhibitied it,and the combining effect of both enzymes was definitely proved to be higher than the effect of single one.Based on these results,a mechanism of peroxidation effects on liposome of active oxygen species produced by the system of ADP-FeCl_3-xanthi ne-xanthine oxidase is suggested.

ADP-FeCl_3-黄嘌呤-黄嘌呤氧化酶体系能引发卵磷脂脂质体的过氧化,但加入超氧化物歧化酶或过氧化氢酶能显著抑制该反应,而且两种酶的合并效应高于单独酶.根据这些结果,提出了ADP-FeCl_3-黄嘌呤-黄嘌呤氧化酶体系产生的活性氧对脂质体过氧化影响的机理.

 
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