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对氧敏感的
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  “对氧敏感的”译为未确定词的双语例句
     OXYGEN SENSITIVE NITROGEN-FIXING MUTANTS OF ANABAENA
     鱼腥藻(Anabaena)对氧敏感的固氮突变种
短句来源
     Zirconia oxygen sensor was a kind of sensor that made up of zirconia solid state electrolyte.
     氧化锆氧传感器是采用氧化锆固体电解质组成的对氧敏感的传感器 ,属于固体离子学中的一个重要应用方面。
短句来源
     A three-electrode galvaniccell sensitive to oxygen is used as sensor which features stability, rapid response and long working life The analyzer iseasy to calibrate.
     传感器采用对氧敏感的三电极结构原电池,性能稳定,响应速度快,工作寿命长,校准方便。
短句来源
     It is shown that the possible mechanism is the complex compound of Cu+ will be oxidized by solution oxygen when Cu2+is reduced by ascorbic acid.
     结果表明Cu~(2+)与三磺基四苯(?) 基四苯基卟啉配位反应的可能机制为抗坏血酸首先将高价铜还原为亚铜,亚铜离子与配位剂生成对氧成对氧敏感的不稳定中间体Cu~(Ⅰ)——三磺基四:苯基卟啉配合物,立即又被溶解氧氧化为Cu(Ⅱ)——Ⅱ)——三磺基四苯基卟啉配合物。
短句来源
  相似匹配句对
     For accessions in the O.
     在O.
短句来源
     The combined sine-wave signal proposed by R.
     R.
短句来源
     OXYGEN SENSITIVE NITROGEN-FIXING MUTANTS OF ANABAENA
     鱼腥藻(Anabaena)敏感的固氮突变种
短句来源
     Oxygen effects on the reaction were also investigated.
     观察了反应的影响。
短句来源
     Synthesis of p-Nitrophenoxy Propanoic Acid
     硝基苯丙酸的合成
短句来源
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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 results of our experiments are as follows:

分子氢在一定程度上可以消除氧对蓝藻固氮活性的损伤而起一种保护作用。氧对蓝藻固氮活性的损伤主要在固氮反应初期,且是不可逆的。分子氢的保护作用也在反应初期,分子氢过迟加入,其保护作用就会受到削弱或消失,其最大保护作用是在与氧同时加入之时。分子氢的保护作用和生理条件有一定联系。年老的蓝藻中,分子氢支持的固氮活性对氧敏感小些。温度、CO_2、氮气和一系列抑制剂都只影响固氮活性的高低,并不改变分子氢的有益行为。蓝藻经乙炔预处理导致氢酶受抑时,分子氢对固氮活性受氧损伤时的保护作用即受到削弱或消失。

The studies on the relationships between the output voltage of the Ag-Pb microcell and the content of oxygen and between the output voltage of the cell and the temperature were described. An oxygen analyzer had been designed on the bases of the electrochemical parameters of the cell. The accuracy of the analyzer was ±1% of full scale.

利用银—铅电池对氧敏感的原理,研究电池输出电压与氧浓度的关系及在氧浓度不变时,电池输出电压与温度的关系。

 
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