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首页> 外文期刊>Polar biology >Microbially mediated redox transformations of manganese (II) along with some other trace elements: a study from Antarctic lakes
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Microbially mediated redox transformations of manganese (II) along with some other trace elements: a study from Antarctic lakes

机译：微生物介导的锰（II）的氧化还原转化以及其他一些微量元素：来自南极湖的一项研究

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The significance of freshwater systems in global manganese cycles is well appreciated. Yet, the polar systems, which encompass the largest freshwater repository in the world, have been least studied for their role in manganese cycling. Here, we present results from a study that was conducted in the brackish water lakes in the Larsemann Hills region (east Antarctica). The rate of in situ manganese oxidation ranged from 0.04 to 3.96 ppb day~(-1). These lakes harbor numerous manganese-oxidizing bacteria (10~5 to 10~6 CFU I~(-1)), predominantly belonging to genera Shewanella, Pseudomonas and an unclassified genus in the family Oxalobacteriaceae. Experiments were conducted with representatives of predominant genera to understand their contribution to Mn cycling and also to assess their metabolic capabilities in the presence of this metal. In general, the total and respiring cell counts were stimulated to a maximum when the growth medium was amended with 10 mM manganese. The addition of manganese promoted the use of D-mannitol, maltose, etc., but inhibited the use of maltotri-ose, L-serine and glycyl L-glutamic acid. The bacterial isolates were able to catalyze both the redox reactions in manganese cycling. In vitro manganese oxidation rates ranged from 3 to 147 ppb day~(-1), while manganese reduction rates ranged from 35 to 213 ppb day~(-1). It was also observed that the maximum stimulation of manganese oxidation occurred in the presence of cobalt (81 ±57 ppb day~(-1)), rather than iron (37 ± 16 ppb day~(-1)) andrnnickel (40 ± 47 ppb day~(-1)). Our studies suggest that cobalt could have a more profound role in manganese oxidation, while nickel promoted manganese reduction in polar aquatic systems.
机译：淡水系统在全球锰循环中的重要性已广为人知。然而，极地系统因其在锰循环中的作用而受到最少的研究，该极地系统涵盖了世界上最大的淡水储存库。在这里，我们介绍了在Larsemann Hills地区（南极洲东部）的咸水湖中进行的一项研究的结果。原位锰的氧化速率范围为0.04至3.96 ppb day〜（-1）。这些湖泊中有许多锰氧化细菌（10〜5至10〜6 CFU I〜（-1）），主要属于希瓦氏菌属，假单胞菌属和草酸杆菌科的一个未分类属。与主要属的代表进行了实验，以了解它们对锰循环的贡献，并评估其在这种金属存在下的代谢能力。通常，当用10 mM锰修正生长培养基时，总细胞数和呼吸细胞数被刺激到最大。锰的添加促进了D-甘露醇，麦芽糖等的使用，但是抑制了麦芽三糖，L-丝氨酸和甘氨酰L-谷氨酸的使用。细菌分离物能够催化锰循环中的两种氧化还原反应。体外锰的氧化速率为3到147 ppb日〜（-1），而锰的还原速率为35到213 ppb日〜（-1）。还观察到，锰的最大刺激发生在钴（81±57 ppb day〜（-1）），而不是铁（37±16 ppb day〜（-1））和镍（40±47）的情况下。 ppb天〜（-1））。我们的研究表明，钴可能在锰的氧化中起更重要的作用，而镍促进了极性水生系统中锰的还原。

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  • 来源
    《Polar biology》 |2009年第12期|1765-1778|共14页
  • 作者

    K. P. Krishnan; Rupesh Kumar Sinha; Kiran Krishna; Shanta Nair; S. M. Singh;

  • 作者单位

    National Centre for Antarctic and Ocean Research, Headland Sada, Vasco da Gama, Goa 403804, India;

    National Centre for Antarctic and Ocean Research, Headland Sada, Vasco da Gama, Goa 403804, India;

    National Institute of Oceanography, Dona Paula, Goa, India;

    National Institute of Oceanography, Dona Paula, Goa, India;

    National Centre for Antarctic and Ocean Research, Headland Sada, Vasco da Gama, Goa 403804, India;

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  • 正文语种 eng
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  • 关键词

    Antarctica; lakes; manganese; oxidation; bacteria;

    机译：南极洲;湖泊锰;氧化菌;

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