CONCENTRATION AND TRANSPORT OF NITRATE BY THE MAT-FORMING SULFUR BACTERIUM THIOPLOCA
CONCENTRATION AND TRANSPORT OF NITRATE BY THE MAT-FORMING SULFUR BACTERIUM THIOPLOCA
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DOI：
10.1038/374713a0
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发表时间：
1995-04-20
期刊：
影响因子：
64.8
通讯作者：
ULLOA, O
中科院分区：
文献类型：
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作者：
FOSSING, H;GALLARDO, VA;ULLOA, O
Thioploca的海洋物种分布在秘鲁南部和智利北部和中部沿大陆架3000多公里处（1-4）。这些丝状细菌生活在由一个共同的鞘包围的束状中，并在上升流区域的氧气最低区海底形成厚厚的席子，水深在40至280米之间。这种海洋细菌的代谢（5,6）一直是一个谜，直到很长一段时间后才被发现（1,7）。我们在这里报道，硫斑细胞能够在液体液泡中浓缩到500毫米，液泡占细胞体积的80%。滑动细丝将这种硝酸盐运送到沉积物中5-10厘米，并伴随着硫化氢的氧化，从而使沉积物中的氮和硫循环耦合。
MARINE species of Thioploca occur over 3,000 km along the continental shelf off Southern Peru and North and Central Chile(1-4). These filamentous bacteria live in bundles surrounded by a common sheath and form thick mats on the sea floor under the oxygen-minimum zone in the upwelling region, at between 40 and 280 m water depth. The metabolism of this marine bacterium(5,6) remained a mystery until long after its discovery(1,7). We report here that Thioploca cells are able to concentrate nitrate to up to 500 mM in a liquid vacuole that occupies >80% of the cell volume. Gliding filaments transport this nitrate 5-10 cm down into the sediment and reduce it, with concomitant oxidation of hydrogen sulphide, thereby coupling the nitrogen and sulphur cycles in the sediment.