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Regional and general

机译：区域和一般

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Dissimilatory iron-reducing microorganisms play an important role in the biogeochemical cycle of iron and influence iron mineral formation and transformation. However, studies on microbial iron-reducing processes in deep-sea hydrothermal fields are limited. A novel piezophilic, thermophilic, anaerobic, fermentative iron-reducing bacteria of class Clostridia, named Anoxy-bacter fermentans DY226137, was isolated from East Pacific Rise hydrothermal sulfides. In this report, we examined its cell growth, fermentative metabolites, and biomineralization coupled with dissimilatory iron reduction. Both soluble ferric citrate (FC) and solid amorphous Fe(III) oxyhydroxide (FO) could promote cell growth of this strain, accompanied by increased peptone consumption. More acetate, butyrate, and CO_2 were produced than without adding FO or FC in the media. The highest yield of H_2 was observed in the Fe(III)-absent control. Coupled to fermentation, magnetite particles, and iron-sulfur complexes were respectively formed by the strain during FO and FC reduction. Under experimental conditions mimicking the pressure prevailing at the deep-sea habitat of DY22613~T (20 MPa), Fe(III)-reduc-tion rates were enhanced resulting in relatively larger magnetite nanoparticles with more crystal faces. These results implied that the potential role of A. fermentans DY22613~T in situ in deep-sea hydrothermal sediments is coupling iron reduction and mineral transformation to fermentation of biomolecules. This bacterium likely contributes to the complex biogeochemical iron cycling in deep-sea hydrothermal fields.
机译：异化还原铁微生物在铁的生物地球化学循环中起着重要作用，并影响铁矿物质的形成和转化。但是，关于深海热液领域中微生物还原铁过程的研究是有限的。从东太平洋上升热液硫化物中分离出一种新的嗜梭菌，嗜热，厌氧，梭状芽孢杆菌发酵的铁还原细菌，称为厌氧发酵菌DY226137。在本报告中，我们检查了其细胞生长，发酵代谢产物和生物矿化以及异化铁的还原。可溶性柠檬酸铁（FC）和固体无定形氢氧化三价铁（III）均可促进该菌株的细胞生长，同时增加蛋白p的消耗。与在培养基中不添加FO或FC相比，产生的乙酸盐，丁酸盐和CO_2数量更多。在缺少Fe（III）的对照中观察到最高的H_2收率。与发酵耦合，在FO和FC还原过程中，应变分别形成磁铁矿颗粒和铁硫复合物。在模拟DY22613〜T（20 MPa）的深海生境中普遍存在的压力的实验条件下，Fe（III）的还原速率提高，从而导致相对较大的磁铁矿纳米粒子具有更多的晶面。这些结果表明，发酵曲霉DY22613〜T在深海热液沉积物中的潜在作用是将铁还原和矿物质转化与生物分子的发酵联系起来。这种细菌可能有助于深海热液场中复杂的生物地球化学铁循环。

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    《Oceanographic Literature Review》 |2019年第5期|987-988|共2页
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