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首页> 外文期刊>Geomicrobiology Journal >Molecular and Cellular Fossils of a Mat-Like Microbial Community in Geothermal Boratic Sinters
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Molecular and Cellular Fossils of a Mat-Like Microbial Community in Geothermal Boratic Sinters

机译：地热硼酸盐烧结矿中类似微生物群落的分子和细胞化石。

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Silica and travertine deposits, the two most common surface manifestations of terrestrial hot springs, have so far been the only markers universally helpful in locating and interpreting geothermal systems and past lifeforms potentially associated with them. In the current study, we for the first time report microbial fossils from a third type of geothermal sinter, viz. the boron mineral deposits, which are characteristic of the relatively uncommon silicate-poor hot springs. Organic biomarker analyses of the boratic sinters framing the hot springs of Puga valley, Ladakh, identified molecular fossils (viz. respiratory and photosynthetic isoprenoid quinones and photosynthetic pigments) of a mat-like microbial community putatively comprised of algae, fungi, cyanobacteria and other photosynthetic bacteria, some of which may be proteobacteria. So far as microfossil preservation is concerned, mineralized mat-like biofabrics with diverse cellular morphotypes could be identified in scanning electron microscopy of sub-recent sediments as well as hard and consolidated old sinters. Though this putative past community is quite unusual in volcanic niches, its ubiquitous and enduring presence in the Puga geothermal area is highlighted by the discovery of its biosignatures along all of the three dimensions of the explored boratic deposits. These findings usher a new paradigm of looking at past or present geothermal life in as well as outside the Earth.View full textDownload full textKeywordshot spring, geothermal sinter, boron minerals, microfossil, molecular fossilRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/01490451.2011.635761
机译：迄今为止，硅和钙华沉积物是陆地温泉的两种最常见的表面表现形式，是唯一普遍有助于定位和解释地热系统以及与它们潜在相关的生命形态的标志。在当前的研究中，我们首次报道了第三种地热烧结矿中的微生物化石。硼矿床，这是硅酸贫乏温泉相对罕见的特征。对拉达克Puga山谷温泉中的硼盐烧结矿进行有机生物标记分析，确定了垫状微生物群落的分子化石（即呼吸和光合类异戊二烯醌和光合色素），推测其由藻类，真菌，蓝细菌和其他光合生物组成细菌，其中一些可能是蛋白细菌。就微化石的保存而言，可以在近来沉积物以及坚硬固结的老烧结矿的扫描电子显微镜中鉴定出具有多种细胞形态类型的矿化垫状生物纤维。尽管这个推测的过去群落在火山生态位中非常不寻常，但在沿勘探的北冰洋沉积物的所有三个维度上都发现了其生物特征，突显了其在普加地热地区无处不在和持久的存在。这些发现带来了一种新的范式，可以用来审视过去或现在的地球以及地球以外的地热生命。查看全文下载全文关键词弹簧，地热烧结矿，硼矿，微化石，分子化石相关变量var addthis_config = {ui_cobrand：“ Taylor＆Francis Online ”，services_compact：“ citeulike，网络振动，微博，technorati，美味，linkedin，facebook，stumbleupon，digg，google，更多”，发布号：“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/01490451.2011.635761

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