解剖学和形态学
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听力与言语-语言病理学
行为科学
心脏和心血管系统
细胞和组织工程学
临床神经病学
危重症监护医学
牙科,口腔外科和医学
皮肤病学
急诊医学
内分泌学和新陈代谢
肠胃学和肝脏学
老人病学和老年医学
卫生保健科学和服务
血液学
免疫学
传染病
综合和补充性医学
医学伦理学
医学信息学
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医学,全科和内科
医学,法律
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神经系统科学
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眼科学
整形外科学
耳鼻喉科学
病理学
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药理学和药剂学
生理学
基本医疗保健
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生殖生物学
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运动科学
外科学
毒理学
热带医学
泌尿学和肾脏学
病毒学
老年医学
健康政策和服务
心理学,临床
abstract::All life requires energy to drive metabolic reactions such as growth and cell maintenance; therefore, fluctuations in energy availability can alter microbial activity. There is a gap in our knowledge concerning how energy availability affects the growth of extreme chemolithoautotrophs. Toward this end, we investigated...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12413
更新日期:2021-01-01 00:00:00
abstract::It has been argued that skeletal Mg/Ca ratio in echinoderms is mostly governed by Mg2+ and Ca2+ concentrations in the ambient seawater. Accordingly, well-preserved fossil echinoderms were used to reconstruct Phanerozoic seawater Mg2+ /Ca2+ ratio. However, Mg/Ca ratio in echinoderm skeleton can be affected by a number ...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12409
更新日期:2020-11-01 00:00:00
abstract::Metal sulfide minerals, including mercury sulfides (HgS), are widespread in hydrothermal vent systems where sulfur-oxidizing microbes are prevalent. Questions remain as to the impact of mineral composition and structure on sulfur-oxidizing microbial populations at deep-sea hydrothermal vents, including the possible ro...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12396
更新日期:2020-09-01 00:00:00
abstract::Lipid biomarker assemblages preserved within the bitumen and kerogen phases of sedimentary rocks from the ca. 780-729 Ma Chuar and Visingsö Groups facilitate paleoenvironmental reconstructions and reveal fundamental aspects of emerging mid-Neoproterozoic marine communities. The Chuar and Visingsö Groups were deposited...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12378
更新日期:2020-05-01 00:00:00
abstract::Few topics in geobiology have been as extensively debated as the role of Earth's oxygenation in controlling when and why animals emerged and diversified. All currently described animals require oxygen for at least a portion of their life cycle. Therefore, the transition to an oxygenated planet was a prerequisite for t...
journal_title:Geobiology
pub_type: 杂志文章,评审
doi:10.1111/gbi.12382
更新日期:2020-05-01 00:00:00
abstract::Ediacaran sediments record an unusual global carbon cycle perturbation that has been linked to widespread oceanic oxygenation, the Shuram negative C isotope excursion (NCIE). However, proxy-based estimates of global ocean redox conditions during this event have been limited largely due to proxy specificity (e.g., euxi...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12379
更新日期:2020-05-01 00:00:00
abstract::The Atacama Desert is the driest non-polar desert on Earth, presenting precarious conditions for biological activity. In the arid coastal belt, life is restricted to areas with fog events that cause almost daily wet-dry cycles. In such an area, we discovered a hitherto unknown and unique ground covering biocenosis dom...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12368
更新日期:2020-01-01 00:00:00
abstract::The formation of carbonate concretions is a cementation process which passively infills the pore spaces within sediments. They record the original environments of deposition and diagenetic conditions of the host rocks. Little is known about the precise mechanisms responsible for the precipitation of carbonate concreti...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12362
更新日期:2020-01-01 00:00:00
abstract::Meromictic lakes with anoxic bottom waters often have active methane cycles whereby methane is generally produced biogenically under anoxic conditions and oxidized in oxic surface waters prior to reaching the atmosphere. Lakes that contain dissolved ferrous iron in their deep waters (i.e., ferruginous) are rare, but v...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12365
更新日期:2020-01-01 00:00:00
abstract::Permanently anoxic regions in the ocean are widespread and exhibit unique microbial metabolic activity exerting substantial influence on global elemental cycles and climate. Reconstructing microbial metabolic activity rates in these regions has been challenging, due to the technical difficulty of direct rate measureme...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12357
更新日期:2019-11-01 00:00:00
abstract::The ca. 1.9 Ga Beaverlodge Lake paleosol was studied using redox-sensitive Cr isotopes in order to determine the isotopic response to paleoweathering of a rhyodacite parent rock 500 million years after the Great Oxidation Event. Redox reactions occurring in modern weathering environments produce Cr(VI) that is enriche...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12342
更新日期:2019-09-01 00:00:00
abstract::The later Cambrian Steptoean Positive Carbon Isotope Excursion (SPICE) event was an episode marked by pronounced changes to the global biogeochemical cycles of carbon and sulfur and significant extinctions on several paleocontinents including Laurentia (North America). While the exact cause(s) of these events remains ...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12334
更新日期:2019-07-01 00:00:00
abstract::The dissolution of elemental selenium [Se(0)] during chemical weathering is an important step in the global selenium cycle. While microorganisms have been shown to play a key role in selenium dissolution in soils, the mechanisms of microbial selenium solubilization are poorly understood. In this study, we isolated a B...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12328
更新日期:2019-05-01 00:00:00
abstract::Subseafloor sulfate concentrations typically decrease with depth as this electron acceptor is consumed by respiring microorganisms. However, studies show that seawater can flow through hydraulically conductive basalt to deliver sulfate upwards into deeply buried overlying sediments. Our previous work on IODP Site C001...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12324
更新日期:2019-03-01 00:00:00
abstract::Earth's atmospheric composition has changed significantly over geologic time. Many redox active atmospheric constituents have left evidence of their presence, while inert constituents such as dinitrogen gas (N2 ) are more elusive. In this study, we examine two potential biological indicators of atmospheric N2 : the mo...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12312
更新日期:2019-01-01 00:00:00
abstract::We established Fe(III)-reducing co-cultures of two species of metal-reducing bacteria, the Gram-positive Desulfotomaculum reducens MI-1 and the Gram-negative Geobacter sulfurreducens PCA. Co-cultures were given pyruvate, a substrate that D. reducens can ferment and use as electron donor for Fe(III) reduction. G. sulfu...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12295
更新日期:2018-09-01 00:00:00
abstract::The ability of micro-organisms to oxidize manganese (Mn) from Mn(II) to Mn(III/IV) oxides transcends boundaries of biological clade or domain. Many bacteria and fungi oxidize Mn(II) to Mn(III/IV) oxides directly through enzymatic activity or indirectly through the production of reactive oxygen species. Here, we determ...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12288
更新日期:2018-07-01 00:00:00
abstract::Mixing of sediments by moving animals becomes apparent in the trace fossil record from about 550 million years ago (Ma), loosely overlapping with the tail end of the extreme carbonate carbon isotope δ13 Ccarbonate fluctuations that qualitatively distinguish the Proterozoic geochemical record from that of the Phanerozo...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12277
更新日期:2018-05-01 00:00:00
abstract::The emplacement of subaqueous gravity-driven sediment flows imposes a significant physical and geochemical impact on underlying sediment and microbial communities. Although previous studies have established lasting mineralogical and biological signatures of turbidite deposition, the response of bacteria and archaea wi...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12271
更新日期:2018-03-01 00:00:00
abstract::The paleoenvironmental setting in which the Ediacara Biota lived, died, and was preserved in the eponymous Ediacara Member of the Rawnsley Quartzite of South Australia is an issue of long-standing interest and recent debate. Over the past few decades, interpretations have ranged from deep marine to shallow marine to t...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12262
更新日期:2018-01-01 00:00:00
abstract::In modern microbial mats, hydrogen sulfide shows pronounced sulfur isotope (δ34 S) variability over small spatial scales (~50‰ over <4 mm), providing information about microbial sulfur cycling within different ecological niches in the mat. In the geological record, the location of pyrite formation, overprinting from m...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12265
更新日期:2018-01-01 00:00:00
abstract::Through the use of scanning transmission electron microscopy (STEM) combined with other complementary techniques (SEM, cryo-TEM, HRTEM, and EELS), we have studied the interaction of microorganisms inhabiting deep anoxic waters of acidic pit lakes with dissolved aluminum, silica, sulfate, and ferrous iron. These elemen...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12269
更新日期:2018-01-01 00:00:00
abstract::Ooids from the Mesoarchaean Chobeni Formation, Pongola Supergroup, KwaZulu-Natal, South Africa are older than any ooids reported to date. They are made of dolomite and ankerite and show concentric, radial-concentric, micritic, and radial fabrics. Radial ooids are interpreted to have originated from high-Mg-calcite and...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12249
更新日期:2017-11-01 00:00:00
abstract::Microbial fossils and textures are commonly preserved in Ediacaran and early Cambrian coarse-grained siliciclastic sediments that were deposited in tidal and intertidal marine settings. In contrast, the fossilization of micro-organisms in similar marine environments of post-Cambrian age is less frequently reported. Th...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12229
更新日期:2017-07-01 00:00:00
abstract::Nitrogen forms an integral part of the main building blocks of life, including DNA, RNA, and proteins. N2 is the dominant gas in Earth's atmosphere, and nitrogen is stored in all of Earth's geological reservoirs, including the crust, the mantle, and the core. As such, nitrogen geochemistry is fundamental to the evolut...
journal_title:Geobiology
pub_type: 杂志文章,评审
doi:10.1111/gbi.12228
更新日期:2017-05-01 00:00:00
abstract::In the aftermath of the end-Permian mass extinction, Early Triassic sediments record some of the largest Phanerozoic carbon isotopic excursions. Among them, a global Smithian-negative carbonate carbon isotope excursion has been identified, followed by an abrupt increase across the Smithian-Spathian boundary (SSB; ~250...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12174
更新日期:2016-05-01 00:00:00
abstract::The period 800-717 million years (Ma) ago, in the lead-up to the Sturtian Snowball glaciation, saw an increase in the diversity of eukaryotic microfossils. To afford an independent and complementary view of this evolutionary period, this study presents the distribution of eukaryotic biomarkers from three pre-Sturtian ...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12165
更新日期:2016-03-01 00:00:00
abstract::The Strelley Pool Formation (SPF) is widely distributed in the East Pilbara Terrane (EPT) of the Pilbara Craton, Western Australia, and represents a Paleoarchean shallow-water to subaerial environment. It was deposited ~3.4 billion years ago and displays well-documented carbonate stromatolites. Diverse putative microf...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12148
更新日期:2015-11-01 00:00:00
abstract::Biogeochemical changes in marine sediments during coastal water hypoxia are well described, but less is known about underlying changes in microbial communities. Bacterial and archaeal communities in Louisiana continental shelf (LCS) hypoxic zone sediments were characterized by pyrosequencing 16S rRNA V4-region gene fr...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12142
更新日期:2015-09-01 00:00:00
abstract::Microfossils belonging to the 1.88-billion-year-old 'Gunflint-biota' are preserved as carbonaceous and hematitic filaments and spheres that are believed to represent ancient chemolithoautotrophic Fe(II) oxidizing bacteria that grew above a chemocline where ferruginous seawater upwelled into shallow, oxygenated waters....
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12127
更新日期:2015-05-01 00:00:00
abstract::The hydrocarbons preserved in an Archean rock were extracted, and their composition and distribution in consecutive slices from the outside to the inside of the rock were examined. The 2.7 Ga rock was collected from the Fortescue Group in the Pilbara region, Western Australia. The bitumen I (solvent-extracted rock) an...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12117
更新日期:2015-03-01 00:00:00
abstract::Alvinellid polychaete worms form multilayered organic tubes in the hottest and most rapidly growing areas of deep-sea hydrothermal vent chimneys. Over short periods of time, these tubes can become entirely mineralized within this environment. Documenting the nature of this process in terms of the stages of mineralizat...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12123
更新日期:2015-03-01 00:00:00
abstract::In aquatic habitats, micro-organisms successfully adhere to and mediate particles, thus changing the erosive response of fine sediments to hydrodynamic forcing by secreting glue-like extracellular polymeric substances (EPS). Because sediment dynamics is vital for many ecological and economic aspects of watersheds and ...
journal_title:Geobiology
pub_type: 杂志文章,评审
doi:10.1111/gbi.12115
更新日期:2015-01-01 00:00:00
abstract::Ocean acidification by atmospheric carbon dioxide has increased almost continuously since the last glacial maximum (LGM), 21,000 years ago. It is expected to impair tropical reef development, but effects on reefs at the present day and in the recent past have proved difficult to evaluate. We present evidence that acid...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12097
更新日期:2014-09-01 00:00:00
abstract::Previous studies of the subsurface biosphere have deduced average cellular doubling times of hundreds to thousands of years based upon geochemical models. We have directly constrained the in situ average cellular protein turnover or doubling times for metabolically active micro-organisms based on cellular amino acid a...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12069
更新日期:2014-01-01 00:00:00
abstract::The well-known debate on the nature and origin of intracellular inclusions (ICIs) in silicified microfossils from the early Neoproterozoic Bitter Springs Formation has recently been revived by reports of possible fossilized nuclei in phosphatized animal embryo-like fossils from the Ediacaran Doushantuo Formation of So...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/gbi.12053
更新日期:2013-11-01 00:00:00
abstract::A combination of scanning transmission X-ray microscopy and X-ray magnetic circular dichroism was used to spatially resolve the distribution of different carbon and iron species associated with Shewanella oneidensis MR-1 cells. S. oneidensis MR-1 couples the reduction of Fe(III)-oxyhydroxides to the oxidation of organ...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2012.00329.x
更新日期:2012-07-01 00:00:00
abstract::Stromatolites are one of the oldest and most intriguing organosedimentary deposits. In contrast to stromatolites of the Precambrian to Early Ordovician, Phanerozoic equivalents occurred episodically under specific conditions. A group of previously undescribed stromatolites in composition occur in the Lower Triassic (O...
journal_title:Geobiology
pub_type: 杂志文章,评审
doi:10.1111/j.1472-4669.2011.00309.x
更新日期:2012-01-01 00:00:00
abstract::Organic biomarkers in marine sedimentary rocks hold important clues about the early history of Earth's surface environment. The chemical relicts of carotenoids from anoxygenic sulfur bacteria are of particular interest to geoscientists because of their potential to signal episodes of marine photic-zone euxinia such as...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2011.00285.x
更新日期:2011-07-01 00:00:00
abstract::Zodletone spring in Oklahoma is a unique environment with high concentrations of dissolved-sulfide (10 mm) and short-chain gaseous alkanes, exhibiting characteristics that are reminiscent of conditions that are thought to have existed in Earth's history, in particular the late Archean and early-to-mid Proterozoic. Her...
journal_title:Geobiology
pub_type: 杂志文章
doi:10.1111/j.1472-4669.2010.00268.x
更新日期:2011-03-01 00:00:00