查询词典 O2

The contrasting isotope data between 850 Myr ago and the Neoproterozoic suggest that the terrestrial expansion of photosynthesizing communities preceded the significant climate perturbations of the late Precambrian glaciations, and was followed by a rise of O2 ref.

对比850百万年前和新元古代的同位素数据表明陆地光合作用群落生物的爆发应当先于晚前寒武纪冰川作用的气候变动。

Saturates and aromatics had a drastic change because of thermal oxidation in O2 atmosphere, while the two components had definite changes in air atmosphere.

最常用的判断沥青抗老化的方法是薄膜烘箱试验，TFOT适合于测定热和空气对沥青薄膜的影响。

ResultsThe ability that scavenges superoxide radical(O2)was Notopterygium forbesii Boiss.

结果羌活对超氧自由基清除能力最强。结论13种伞形科中药对超氧自由基均有清除作用。

Life as a Chelsea fan before Roman Abramovich was not very rosy but at least bearable and even though we were considered as flashy, southern softies, with largely old and overpaid European players at the end of their careers looking for a pension fund; we were not hated with such vehemence and vigour.7 h% p, H- s2 V$ F, \9 t

o2 q； Z； i l6 o# f 阿布来之前的日子对于切尔西的球迷来说也不是一段甜蜜的时光，但那是可以忍受的。尽管我们被认为是来自南边浮夸的傻子，总是使用一些昂贵而过气了的欧洲球员，至少我们没有像今天这样被如此激烈的抨击。

Combustion experiments were performed by burning Wulanmulun coal in a drop tube furnace to study ash formation behaviors during O2/CO2 pulverized coal combustion.

煤炭等燃烧产生的CO2对环境的危害已引起全球关注，各国政府正投入大量的人力物力研究开发CO2减排和封存技术。

Methods The methods of DPPH , pyrograllol auto-oxidation and salicylicl acid were used in order to get the scavenging quality of DPPH free radical , superoxide free radical O2-.

方法采用DPPH法、邻苯三酚自氧化法、水杨酸法，分别测定缬草醚酯提取物清除DPPH自由基、超氧阴离子自由基和羟自由基的能力。

Based on Fenton reaction and the auto-oxidation of pyrogallol, the anti-radical activity of morinda officinalis how was studied by spectrophotometry. The morinda officinalis how has obvious scavenging effects on hydroxyl radical and superoxide anion radicalO2(superscript - with the efficiency related to concentration of morinda officinalis how.

基於Fenton反应和抑制邻苯三酚自氧化原理，分光光度法测定体系吸光度的变化研究巴戟天抗自由基活性，证明巴戟天对羟自由基及超氧阴离子自由基O2(上标-均有良好的清除作用，清除率与巴戟天的浓度有一定的量效关系。

Simulated regression analysis showed that the exponential increase of MDA content, plasmamembrane permeability, auto-oxidation rate of the organ and O2 produc-tion rate and parabolic decrease of SOD activity and GSH content as well as the logarithmic decrease of CAT activity in the stressed leaves were found with the decrease of soil water content....

经回归模拟显示，蔗叶MDA含量、质膜差别透性、O_2产生速率和组织自动氧化速率均随土壤含水量的降低呈指数增加，SOD活性和GSH含量呈抛物线变化，而CAT活性呈对数降低；逐步回归分析定量地指出了水分胁迫下蔗叶SOD和CAT在清除活性氧、防止膜脂过氧化和质膜破坏中的协同作用关系，且受O_2产生的影响；经卡方测验证实，该回归模型各参数与大田干旱胁迫的实际结果相符。

Antioxidative activity of flavonoids from Lespedeza bicolor were investigated by examining the scavenging effects on hydroxyl radicals and superoxide anion O2(superscript - and the inhibitions on auto-oxidation of lard, rape seed oil, and linoleic acid, The results showed that LBF had significant scavenging functions to free radical and superoxide anion, and the scavenging effect increased with the increase of the content of LBF; LEF can remarkably inhibit auto-oxidation of lard, rape seed oil, and linoleic acid, indicating its potential as a natural antioxidant.

通过二色胡枝子黄酮(Lespedeza bicolor flavonoids， LBF)清除羟自由基、超氧阴离子的效果及抑制猪油、菜油、和亚油酸的自氧化来研究二色胡枝子黄酮的抗氧化活性。其研究结果表明，二色胡枝子黄酮对清除自由基有显著性作用，且清除率随黄酮浓度的增加而增大；能够极显著地抑制猪油、菜油、亚油酸的自氧化(P.01)，抑制作用随浓度的增大而增强。作为天然的抗氧化剂，二色胡枝子黄酮具有一定的开发利用价值。

Photosensitizer rose bengal reacts with O 2 to generate singlet oxygen ( 1O 2) under illumination .

光敏剂RB在光照射下与O2反应产生1O2，1O2与组氨酸或咪唑反应的中间产物使RNO发生氧化，导致RNO在440nm处吸光度减小，此即为RNO脱色反应。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐