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钼酶
相关语句
  molybdenum enzymes
     ADVANCEMENT OF MOLYBDENUM ENZYMES IN HIGHER PLANTS
     高等植物钼酶研究进展
  “钼酶”译为未确定词的双语例句
     Molybdoenzymes and Molybdenum Nutrition in Higher Plants
     高等植物含钼酶与钼营养
短句来源
     Effects of Molybdenum Application on Mo-enzymes, Enzymes Relating with Carbon Metabolism and the Constituents of Cell Wall of Winter Wheat
     施钼对冬小麦钼酶、碳代谢相关酶类及细胞壁组分的影响
短句来源
     The active site structure of the molybdenum oxotransferase is likely to change during foster the molybdenumenzyme crystal because of the sensitivity and friability of the protein, which can make the result warp.
     由于蛋白质极其敏感和脆弱,在进行酶处理培养晶体的过程中可能引起钼酶活性因子的结构变化,从而使测定结果出现偏差。 至今人们对钼酶中钼原子的配位环境了解得仍不够透彻。
短句来源
     Competition between molybdate and tungstate in NR synthesis suggested that NR of A.
     钼和钨的竞争实验说明U-32菌株硝酸还原酶也为一钼酶
短句来源
  相似匹配句对
     ADVANCEMENT OF MOLYBDENUM ENZYMES IN HIGHER PLANTS
     高等植物研究进展
     Molybdoenzymes and Molybdenum Nutrition in Higher Plants
     高等植物含营养
短句来源
     Enzyme mimics
     模型
短句来源
     SPRAY COATING OF MOLYBDENUM
     喷涂
短句来源
     BRAZING OF MOLYBDENUM
     的钎焊
短句来源
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  molybdenum enzymes
Molybdenum enzymes: integration of X-ray crystallographic, EXAFS, spectroscopic, mechanistic, and model system studies
      
X-ray absorption spectroscopy of molybdenum enzymes
      
Mechanistic aspects of the mononuclear molybdenum enzymes
      
The activities of both molybdenum enzymes in the lung also showed progressive decreases with tungsten dose with no changes in lung weight.
      


In this paper the simulation of catalytic reaction of nitrogenase by sodium molybdate was studied. Sodium molybdate is the simplest inorganic compound of molybdenum. In the presence of potassium borohydride, sodium molybdate can catalyze the reduction of acetylene to ethylene. Its specific activity is 4.1 mole C_2H_4/min·mole Mo which is about 1% of the activity of natural nitrogenase. Its Michaelis constant and apparent energy of activation are 0.77 atm、2.78×10~(-2)M and 6.5Kcal/mole respectively. The molybdeum...

In this paper the simulation of catalytic reaction of nitrogenase by sodium molybdate was studied. Sodium molybdate is the simplest inorganic compound of molybdenum. In the presence of potassium borohydride, sodium molybdate can catalyze the reduction of acetylene to ethylene. Its specific activity is 4.1 mole C_2H_4/min·mole Mo which is about 1% of the activity of natural nitrogenase. Its Michaelis constant and apparent energy of activation are 0.77 atm、2.78×10~(-2)M and 6.5Kcal/mole respectively. The molybdeum in active state may be dinuclear rather than mononuclear. Although there was ethane as the product of reduction of acetylene in addition to ethylene, ethylene could not be a substrate to be reduced. The reduction of acetylene to ethylene and that of acetylene to ethane were not parallel. They may be catalyzed by different active molybdenum. Twenty different organic compounds used as ligands for molybdenum were added respectively to the Na_2MoO_4-KBH_4 system and their catalytic reaction of acetylene reduction were compared. Some very interesting results were obtained. The catalytic activity of α,α'-dimercaptoadipic acid-Na_2MoO_4-KBH_4 system is the highest. Dimercaptoethane-Na_2MoO_4-KBH_4 system could reduce acetylene only to ethylene so that there was no ethane or other pprouct formation. Similar to nitrogenase, the Na_2MoO_4-KBH_4 system is able to reduce ethanenitrile to ethane. If tungsten was used instead of molybdenum, neither the Na_2WO_4-KBH_4 system nor the Cysteine-Na_2WO_4-KBH_4 system could reduce acetylene to ethylene. It is explained from these results that the nitrogenase containing tungsten is inactive and in those "molybdenum enzymes" containing tungsten, tungsten could not combine effectively with their corresponding apoenzymes. In the last part of this paper the function of the Na_2MoO_4-KBH_4 system as a model of nitrogenase, its reaction characteristics as well as the role of ligand with different chemical groups were discussed. Some problems about the simulation of nitrogenase in structure and function by artificial models were also discussed.

本文报导了以Na_2MoO_4-KBH_4系统模拟固氮酶催化反应的研究工作。钼酸钠是一种最简单的钼的无机化合物。在硼氢化钾存在的情况下,钼酸钠就能催化乙炔还原为乙烯的反应。以反应初速度计,其比活达4.1moleC_2H_4/分·mole Mo,约为固氮酶活性的1%。米氏常数为0.77大气压、2.78×10~(-2)M。表观活化能为6.5千卡/克分子。处于活性状态的钼不是单核的,而可能是双核的。虽然乙炔还原的产物除乙烯外还有乙烷生成,但乙烯不能作为反应底物被还原。乙炔还原为乙烯和乙炔还原为乙烷的反应二者不相关。它们是由不同的活性钼络合物所催化。以20种不同的可作为钼的配位体的有机化合物对Na_2MoO_4-KBH_4系统乙炔还原催化反应的影响在相同条件下进行比较,可以看到一些有趣的规律。α、α′-二巯基己二酸-Na_2MoO_4-KBH_4系统的催化活性最高。二巯基乙烷-Na_2MoO_4-KBH_4系统只表现催化乙炔还原为乙烯的活性,反应产物中只有乙烯而没有乙烷或其他产物生成。象固氮酶一样,Na_2MoO_4-KBH_4系统还具有催化乙腈还原的活性。在相同条件下用钨代替钼,无论Na_2WO_4-KBH_4系统...

本文报导了以Na_2MoO_4-KBH_4系统模拟固氮酶催化反应的研究工作。钼酸钠是一种最简单的钼的无机化合物。在硼氢化钾存在的情况下,钼酸钠就能催化乙炔还原为乙烯的反应。以反应初速度计,其比活达4.1moleC_2H_4/分·mole Mo,约为固氮酶活性的1%。米氏常数为0.77大气压、2.78×10~(-2)M。表观活化能为6.5千卡/克分子。处于活性状态的钼不是单核的,而可能是双核的。虽然乙炔还原的产物除乙烯外还有乙烷生成,但乙烯不能作为反应底物被还原。乙炔还原为乙烯和乙炔还原为乙烷的反应二者不相关。它们是由不同的活性钼络合物所催化。以20种不同的可作为钼的配位体的有机化合物对Na_2MoO_4-KBH_4系统乙炔还原催化反应的影响在相同条件下进行比较,可以看到一些有趣的规律。α、α′-二巯基己二酸-Na_2MoO_4-KBH_4系统的催化活性最高。二巯基乙烷-Na_2MoO_4-KBH_4系统只表现催化乙炔还原为乙烯的活性,反应产物中只有乙烯而没有乙烷或其他产物生成。象固氮酶一样,Na_2MoO_4-KBH_4系统还具有催化乙腈还原的活性。在相同条件下用钨代替钼,无论Na_2WO_4-KBH_4系统还是半胱氨酸-Na_2MoO_4-KBH_4系统都不表现催化乙炔还原为乙烯的活性。解释了含钨的固氮酶无反应活性的原因。同时还解释了在含钨的固氮酶及其他含钨的“钼”酶中钨不能与相应的蛋白有效地结合这一现象。本文还就Na_2MoO_4-KBH_4固氮酶模型系统的作用,反应规律,以及配位体和不同配位基团的作用等进行了讨论,并对当前通过模型系统来研究固氮酶的结构与功能的工作中的一些问题提出了作者的看法。

In this paper the simulation of catalytic reaction of nitrogenase by sodiummolybdate was studied.Sodium molybdate is the simplest inorganic compound ofmolybdenum.In the presence of potassium borohydride,sodium molybdate cancatalyze the reduction of acetylene to ethylene.Its specific activity is 4.1 moleC_2H_4/min·mole Me which is about 1% of the activity of natural nitrogenase.ItsMichaelis constant and apparent energy of activation are 0.77 atm、2.78×10~(-2)M and6.5 Kcal/mole respectively.The molybdeum in active...

In this paper the simulation of catalytic reaction of nitrogenase by sodiummolybdate was studied.Sodium molybdate is the simplest inorganic compound ofmolybdenum.In the presence of potassium borohydride,sodium molybdate cancatalyze the reduction of acetylene to ethylene.Its specific activity is 4.1 moleC_2H_4/min·mole Me which is about 1% of the activity of natural nitrogenase.ItsMichaelis constant and apparent energy of activation are 0.77 atm、2.78×10~(-2)M and6.5 Kcal/mole respectively.The molybdeum in active state may be dinuclear ratherthan mononuclear.Although there was ethane as the product of reduction of acetylenein addition to ethylene,ethylene could not be a substrate to be reduced.Thereduction of acetylene to ethylene and that of acetylene to ethane were not parallel.They may be catalyzed by different active molybdenum.Twenty different organiccompounds used as ligands for molybdenum were added respectively to the Na_2MoO_4-KBH_4 system and their catalytic reaction of acetylene reduction were compared.Somevery interesting results were obtained.The catalytic activity of α,α'-dimercaptoadipicacid-Na_2MoO_4-KBH_4 system is the highest.Dimercaptoethane-Na_2MoO_4-KBH_4 systemcould reduce acetylene only te ethylene so that there was no ethane or other pprouctformation.Similar to nitrogenase,the Na_2MoO_4-KBH_4 system is able to reduceethanenitrile to ethane.If tungsten was used instead of molybdenum,neither theNa_2WO_4-KBH_4 system nor the Cysteine-Na_2WO_4-KBH_4 system could reduce acetyleneto ethylene.It is explained from these results that the nitrogenase containing tungstenis inactive and in those “molybdenum enzymes” containing tungsten,tungsten couldnot combine effectively with their corresponding apoenzymes.In the last part of thispaper the function of the Na_2MoO_4-KBH_4 system as a model of nitrogenase,its reactioncharacteristics as well as the role of ligand with different chemical groups were discussed.Some problems about the simulation of nitrogenase in structure and function byartificial models were also discussed.

本文报导了以Na_2MoO_4-KBH_4系统模拟固氮酶催化反应的研究工作。钼酸钠是一种最简单的钼的无机化合物。在硼氢化钾存在的情况下,钼酸钠就能催化乙炔还原为乙烯的反应。以反应初速度计,其比活达4.1mole C_2H_4/分·mole Mo,约为固氮酶活性的1%。米氏常数为0.77大气压、2.78×10~(-2)M。表观活化能为6.5千卡/克分子。处于活性状态的钼不是单核的,而可能是双核的。虽然乙炔还原的产物除乙烯外还有乙烷生成,但乙烯不能作为反应底物被还原。乙炔还原为乙烯和乙炔还原为乙烷的反应二者不相关。它们是由不同的活性钼络合物所催化。以20种不同的可作为钼的配位体的有机化合物对Na_2MoO_4-KBH_4系统乙炔还原催化反应的影响在相同条件下进行比较,可以看到一些有趣的规律。α、α′-二巯基己二酸-Na_2MoO_4-KBH_4系统的催化活性最高。二巯基乙烷-Na_2MoO_4-KBH_4系统只表现催化乙炔还原为乙烯的活性,反应产物中只有乙烯而没有乙烷或其他产物生成。象固氮酶一样,Na_MoO_4-KBH_4系统还具有催化乙腈还原的活性。在相同条件下用钨代替钼,无论Na_2WO_4-KBH_4系统...

本文报导了以Na_2MoO_4-KBH_4系统模拟固氮酶催化反应的研究工作。钼酸钠是一种最简单的钼的无机化合物。在硼氢化钾存在的情况下,钼酸钠就能催化乙炔还原为乙烯的反应。以反应初速度计,其比活达4.1mole C_2H_4/分·mole Mo,约为固氮酶活性的1%。米氏常数为0.77大气压、2.78×10~(-2)M。表观活化能为6.5千卡/克分子。处于活性状态的钼不是单核的,而可能是双核的。虽然乙炔还原的产物除乙烯外还有乙烷生成,但乙烯不能作为反应底物被还原。乙炔还原为乙烯和乙炔还原为乙烷的反应二者不相关。它们是由不同的活性钼络合物所催化。以20种不同的可作为钼的配位体的有机化合物对Na_2MoO_4-KBH_4系统乙炔还原催化反应的影响在相同条件下进行比较,可以看到一些有趣的规律。α、α′-二巯基己二酸-Na_2MoO_4-KBH_4系统的催化活性最高。二巯基乙烷-Na_2MoO_4-KBH_4系统只表现催化乙炔还原为乙烯的活性,反应产物中只有乙烯而没有乙烷或其他产物生成。象固氮酶一样,Na_MoO_4-KBH_4系统还具有催化乙腈还原的活性。在相同条件下用钨代替钼,无论Na_2WO_4-KBH_4系统还是半胱氨酸-Na_2MoO_4-KBH_4系统部不表现催化乙炔还原为乙烯的活性。解释了含钨的固氮酶无反应潘性的原因。同时还解释了在含钨的同氮酶及其他含钨的“钼”酶中钨不能与相应的蛋白有效地结合这一现象。本文还就Na_2MoO_4-KBH_4同氮酶模型系统的作用,反应规律,以及配位体和不同配位基团的作用等进行了讨论,并对当前通过模型系统来研究固氮酶的结构与功能的工作中的一些问题提出了作者的看法。

eticulocytosis was induced in rats by bleeding

经眼和尾静脉反复失血可使大鼠末梢血网织红细胞数明显增多。其红细胞NADH一细胞色素b5高铁血红蛋白还原酶活力明显升高的同时,钼含量亦显著增加。相关性分析结果表明,两者呈明显正相关,提示此酶可能是一种新的含钼酶,或者是依赖于钼的酶。此方法虽可使红细胞谷胱甘肽过氧化物酶、过氧化氢酶及超氧化物歧化酶活力呈一致性升高趋势,但与未失血之对照组间无统计学差异。

 
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