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首页> 外文期刊>Environmental Science & Technology >Effects of Tungsten and Titanium Oxide Nanoparticles on the Diazotrophic Growth and Metals Acquisition by Azotobacter vinelandii under Molybdenum Limiting Condition
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Effects of Tungsten and Titanium Oxide Nanoparticles on the Diazotrophic Growth and Metals Acquisition by Azotobacter vinelandii under Molybdenum Limiting Condition

机译：钨和钛氧化物纳米颗粒对钼限制条件下重氮营养性生长的固氮细菌的影响

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摘要

The acquisition of essential metals, such as the metal cofactors (molybdenum (Mo) and iron (Fe)) of the nitrogenase, the enzyme responsible for the reduction of dinitrogen (N_2) to ammonium, is critical to N_2 fixing bacteria in soil. The release of metal nanoparticles (MNPs) to the environment could be detrimental to N_2 fixing bacteria by introducing a new source of toxic metals and by interfering with the acquisition of essential metals such as Mo. Since Mo has been reported to limit nonsymbiotic N_2 fixation in many ecosystems from tropical to cold temperate, this question is particularly acute in the context of Mo limitation. Using a combination of microbiology and analytical chemistry techniques, we have evaluated the effect of titanium (Ti) and tungsten (W) oxide nanoparticles on the diazotrophic growth and metals acquisition in pure culture of the ubiquitous N_2 fixing bacterium Azotobacter vinelandii under Mo replete and Mo limiting conditions. We report that under our conditions (≤10 mg·L~(-1)) TiO_2 NPs have no effects on the diazotrophic growth of A vinelandii while WO_3 NPs are highly detrimental to the growth especially under Mo limiting conditions. Our results show that the tenacity of WO_3 NPs to A. vinelandii is due to an interference with the catechol-metalophores assisted uptake of Mo.
机译：必不可少的金属（例如负责将二氮（N_2）还原为铵的酶）的固氮酶（金属辅因子（钼（Mo）和铁（Fe）））的获得对于土壤中固氮菌至关重要。通过引入新的有毒金属来源并干扰诸如Mo的必需金属的获取，金属纳米颗粒（MNP）向环境的释放可能对N_2固定细菌有害。由于据报道，Mo会限制N_2的非共生性N_2固定。从热带到寒冷的许多生态系统，在钼限制的情况下，这个问题尤为严重。使用微生物学和分析化学技术的结合，我们评估了在富Mo和富Mo条件下，无处不在的N_2固定细菌葡萄固氮菌纯培养中重金属营养和钛（Ti）和钨（W）纳米颗粒的影响。限制条件。我们报道，在我们的条件下（≤10mg·L〜（-1）），TiO_2 NPs对A vinelandii的重养生长没有影响，而WO_3 NPs对Mo的生长特别是在Mo限制条件下非常有害。我们的结果表明，WO_3 NPs对A. vinelandii的坚韧性是由于对儿茶酚-金属基团辅助的Mo吸收的干扰。

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  • 来源
    《Environmental Science & Technology》 |2013年第4期|2061-2068|共8页
  • 作者

    Patrick Allard; Romain Darnajoux; Karine Phalyvong; Jean-Philippe Bellenger;

  • 作者单位

    Departement de Chimie, Universite de Sherbrooke, 2500 Boul. de l'Universite, Sherbrooke, Quebec J1K 2R1, Canada;

    Departement de Chimie, Universite de Sherbrooke, 2500 Boul. de l'Universite, Sherbrooke, Quebec J1K 2R1, Canada;

    Departement de Chimie, Universite de Sherbrooke, 2500 Boul. de l'Universite, Sherbrooke, Quebec J1K 2R1, Canada;

    Departement de Chimie, Universite de Sherbrooke, 2500 Boul. de l'Universite, Sherbrooke, Quebec J1K 2R1, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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