Science topic

Geomicrobiology - Science topic

Geomicrobiology is the result of the combination of geology and microbiology. The field of geomicrobiology concerns the role of microbe and microbial processes in geological and geochemical processes and vice-versa.
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Publications related to Geomicrobiology (1,604)
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—The geological environment of ore formation in sandstone-type uranium deposits is considered in light of modern geomicrobiological and ecological (environmental) mineralogical data related to solving environmental bioremediation problems (purification of the near-surface environment via bacterial fixation of radionuclides). Analysis of the literat...
Presentation
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Extremophiles possess ability to tolerate and live under the extremes of physico-chemical, geological and nutritional conditions. These microorganisms are evolutionary relics with the evolution of the adaptation strategies at cellular, biochemical and molecular levels. Their metabolic pathways and enzymatic tools have enabled them to maintain stabi...
Article
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One of the most abundant and ubiquitous taxa observed in eastern Australian coal seams is an uncultured Desulfuromonas species and part of the Coal Seam Microbiome dataset assigned as ‘CSMB_57’. Despite this abundance and ubiquity, knowledge about this taxon is limited. The present study aimed to generate an enrichment culture of Desulfuromonas sp....
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The present study explored the microbial diversity of black deposits found in the “Infernaccio” gorge. X-ray Powdered Diffraction (XRPD) was used to investigate the crystallinity of the samples and to identify the minerals. Scanning electron microscope and energy-dispersive X-ray spectroscopy (SEM-EDS) were used to detect the bacterial imprints, an...
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The microbial diversity in the Indian caves is inadequately characterized. This study reports on the culturable microbial communities in caves from the Indian sub-continent. This study aims to expand the current understanding of bacterial diversity in the speleothems and wall deposits from Krem Soitan, Krem Lawbah, Krem Mawpun in Khasi Hills, Megha...
Article
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Crewed missions to Mars are expected to take place in the coming decades. After short-term stays, a permanent presence will be desirable to enable a wealth of scientific discoveries. This will require providing crews with life-support consumables in amounts that are too large to be imported from Earth. Part of these consumables could be produced on...
Article
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Caves are extreme, often oligotrophic, environments that house diverse groups of microorganisms. Many of these microbes can perform microbiologically induced carbonate precipitation (MICP) to form crystalline secondary cave deposits known as speleothems. The urease family is a group of enzymes involved in MICP that catalyze the breakdown of urea, w...
Article
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The irregular damp dark staining on the stonework of a salt-contaminated twelfth century granite-built chapel is thought to be related to a non-homogeneous distribution of salts and microbial communities. To enhance understanding of the role of microorganisms in the presence of salt and damp stains, we determined the salt content and identified the...
Article
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The radiolysis of porewaters by uranium, thorium, and potassium in mineral grains is a recognised source of molecular hydrogen in rock- and sediment-hosted fluids. This radiolytic hydrogen is of geomicrobiological interest as a potential energy source (electron donor) for microbial metabolism, especially in energy-limited settings such as the marin...
Article
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Cave carbonates, seemingly growing in defiance of gravity, have attracted the community's interest for more than a century. This paper focusses on `helictites´, contorted vermiform speleothems with central capillaries. Petrographic, crystallographic and geochemical data of calcitic and aragonitic helictites (recent to 347 ka) from three caves in We...
Conference Paper
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The deep-sea abyssal sediments of the Central Indian Basin (CIB) have been studied for more than three decades from perspectives of marine mineral mining of polymetallic nodules and concerned biodiversity issues. The project funded by Ministry of Earth Sciences, New Delhi, India, has given a massive scope to understand additional dimensions of grea...
Article
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The Collisional Orogeny in the Scandinavian Caledonides (COSC) scientific drilling project aims to characterise the structure and orogenic processes involved in a major collisional mountain belt by multidisciplinary geoscientific research. Located in western central Sweden, the project has drilled two fully cored deep boreholes into the bedrock of...
Presentation
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Plant-Microbes Interaction and Salinity Stress: Rhizobacterial dynamics and Microbiome Engineering Satya P. Singh UGC-CAS Department of Biosciences, Saurashtra University, Rajkot, Gujarat, India Abstract The Halophilic/Haloalkaliphilic bacteria play important role in the saline ecosystems. In this presentation, aspects of the rhizosphere microbiom...
Article
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Precipitation may increase or decrease by different intensities, but the pattern and mechanism of soil microbial community assembly under various precipitation changes remain relatively underexplored. Here, while ±30% precipitation caused a small decrease (∼19%) in the within-treatment taxonomic compositional dissimilarity through the deterministic...
Article
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Bacterial diversity of four thermally different hot springs of Ratnagiri district, Maharashtra, India, was investigated using culture-dependent and culture-independent approaches. A total of 144 bacterial cultures were isolated and identified using MALDI-TOF MS (matrix-assisted laser desorption ionization-time of flight mass spectrometry) and 16S r...
Book
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The monograph presents the results of joint scientifi c Russian-Vietnamese integrated expedition onboard RV “Akademik M.A. Lavrentiev” (cruise 88), carried out 5.10–08.12.2019. The primary results of the geological structure and geophysical fi elds of the Vietnam continental shelf and slope and deep basins, the study of oceanographic, gasgeochemica...
Article
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Cyanobacterial mats are dense communities of microorganisms that contain photosynthetic cyanobacteria along with a host of other bacterial species that play important yet still poorly understood roles in this ecosystem. Although such cyanobacterial mats were critical agents of Earth’s biological and chemical evolution through geological time, littl...
Article
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Bacterial weathering plays a significant role in rock weathering, yet only a limited number of studies were conducted on this topic. The recent rapid developments in geomicrobiology are expected to increase the pace of research in this area. The extent and duration of the biological weathering processes on mineral and rock samples and minerals pref...
Article
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Trichodesmium, a globally important, N2-fixing and colony-forming cyanobacterium, employs multiple pathways for acquiring nutrients from air-borne dust, including active dust collection. Once concentrated within the colony core, dust can supply Trichodesmium with nutrients. Recently, we reported a selectivity in particle collection enabling Trichod...
Conference Paper
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The Venusian surface may be extremely hostile for life to survive. However, several researchers recently argued the possibility of habitable environment on Venus’ Clouds 1. The discovery of Phosphine in Venus emboldened such possibilities. Constraining the habitability excitement, however, the discoverers clarified that the phosphine was a result o...
Conference Paper
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Rogoznica Lake (RL) on the Adriatic coast (43°32’N, 15°58’E) is a typical example of the euxinic marine environment that depending on meteorological conditions fluctuates between anoxic holomictic and meromictic conditions. The Lake is strongly stratified during the season into upper oxic and anoxic deeper water layers, with the mixolimnion which v...
Article
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ABSTRACT The deep biosphere hosts uniquely adapted microorganisms overcoming geochemical extremes at significant depths within the crust of the Earth. Attention is required to understand the near subsurface and its continuity with surface systems, where numerous novel microbial members with unique physiological modifications remain to be identified...
Conference Paper
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The moonmilk is a secondary calcite deposit (speleothem) formed by nanofibers of calcite and commonly found in karst caves. While its biogenic origin is widely accepted, the mechanism of calcite nanofibers production remains unclear. Crystallization and formation mechanism of calcium carbonate nanostructures are of high interest in different fields...
Article
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Rocks that react with liquid water are widespread but spatiotemporally limited throughout the solar system, except for Earth. Rock-forming minerals with high iron content and accessory minerals with high amounts of radioactive elements are essential to support rock-hosted microbial life by supplying organics, molecular hydrogen, and/or oxidants. Re...
Article
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Submarine fluids emissions in the form of geothermal vents are widespread in a variety of geological settings ranging from volcanic to tectonically active areas. This overview aims to describe representative examples of submarine vents in shallow-water areas around the globe. The areas described include: Iceland, Azores, Mediterranean Sea (Italy an...
Conference Paper
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Sulphate reduction is a key biogeochemical process driven by sulphate reducing bacteria (SRB) composed of diverse taxa of anaerobic microorganisms that use oxidized sulphur compounds as terminal electron acceptors. However, the structural and functional diversity of SRB in tropical coastal environments are largely unknown. Hence this study aims to...
Article
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Marine sedimentation rate and bottom-water O2 concentration control organic carbon remineralization and sequestration across continental margins, but whether and how they shape microbiome architecture (the ultimate effector of all biogeochemical phenomena) across shelf and slope sediments is still unclear. Here we reveal distinct microbiome structu...
Article
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Earthquakes cause deformation in previously stable groundwater environments, resulting in changes to the hydrogeological characteristics. The changes to hydrological processes following large-scale earthquakes have been investigated through many physicochemical studies, but understanding of the associated geomicrobiological responses remains limite...
Article
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Seamounts are often covered with Fe and Mn oxides, known as ferromanganese (Fe–Mn) crusts. Future mining of these crusts is predicted to have significant effects on biodiversity in mined areas. Although microorganisms have been reported on Fe–Mn crusts, little is known about the role of crusts in shaping microbial communities. Here, we investigated...
Article
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The sedimentary pyrite sulfur isotope (δ34S) record is an archive of ancient microbial sulfur cycling and environmental conditions. Interpretations of pyrite δ34S signatures in sediments deposited in microbial mat ecosystems are based on studies of modern microbial mat porewater sulfide δ34S geochemistry. Pyrite δ34S values often capture δ34S signa...
Article
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Meghalaya is home to numerous caves of which many are still undiscovered. Geomicrobiological studies so far have focused on the bacterial composition and diversity of these caves. The present study was undertaken to isolate calcifying ureolytic fungi from the Mawsmai cave in Meghalaya, India for their calcium biomineralization efficacy. Out of 77 i...
Article
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Early branching photosynthetic CyanobacteriaGloeobacteralesGloeobacterales
Article
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Nunataks are permanent ice-free rocky peaks that project above ice caps in polar regions, thus being exposed to extreme climatic conditions throughout the year. They undergo extremely low temperatures and scarcity of liquid water in winter, while receiving high incident and reflected (albedo) UVA-B radiation in summer. Here, we investigate the geom...
Article
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Anoxygenic phototrophic bacteria can be important primary producers in some meromictic lakes. Green sulfur bacteria (GSB) have been detected in ferruginous lakes, with some evidence that they are photosynthesizing using Fe(II) as an electron donor (i.e., photoferrotrophy). However, some photoferrotrophic GSB can also utilize reduced sulfur compound...
Preprint
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This study reports on the culturable microbial communities in caves from the Indian sub-continent. A high bacterial diversity and a greater bacterial taxonomic diversity is reported using MALDI-TOF spectrometry and 16S rRNA gene sequencing. This approach helped to detect a number bacterial strains from the Indian caves. The microbial diversity in t...
Conference Paper
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Geomicrobiology is a combination of geology and microbiology, and includes the study of interaction of microorganisms with their environment, such as in sedimentary rocks. This is a new and rapidly-developing field that has led in the past decade to a radically-revised view of the diversity and activity of microbial life on Earth. Geomicrobiology e...
Article
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Humic substances (HS) are one indicator of fertile soils, but more and more soils lose their humic matter. This is mostly due to anthropogenic over-cultivation. Artificial humic acid (A-HA) and artificial fulvic acid (A-FA) were synthesized from agricultural litter, with high similarity to natural HS extracted from soil. These samples were added to...
Article
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The microbiota associated with vermiculations from karst caves is largely unknown. Vermiculations are enigmatic deposits forming worm-like patterns on cave walls all over the world. They represent a precious focus for geomicrobiological studies aimed at exploring both the microbial life of these ecosystems and the vermiculation genesis. This study...
Article
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Microbes and metals are intricately linked in a complex relationship. Many microbial pathways rely on metals for functionality, including enzymatic machinery (co-factors in key enzymes), dissimilatory reduction in energy generation (as alternative electron acceptors in anaerobic respiration) and biomineralization. Some metals share very close physi...
Article
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The paper gives brief results of comprehensive studies in the South China Sea obtained from a joint Russian-Vietnamese expedition in November 2019 (cruise 88 of the R/V "Akademik M.A. Lavrentyev"). The set of methods included acoustics, geophysics, geology, mineralogy,geochemistry, paleogeography, geomicrobiology, hydrooptics and hydrology. The sea...
Conference Paper
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The Central Indian Basin (CIB) sediments at an average water depth 5,000 m are dominantly oxic, organic C-depleted, with suboxic/anoxic mineral cycling processes (Nath et al 2008; Mascarenhas-Pereira et al., 2010; Das et al, 2011a, b; Sujith et al., 2011; Naik et al., 2016; Mascarenhas-Pereira et al., 2016; Biche et al., 2017; Singh et al., 2019)....
Article
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The terrestrial subsurface offers privileged sites both to search for microbial life and to observe still mostly unknown characteristic lithologies. In particular, caves represent natural laboratories to investigate unique minerogenetic processes and biotic interactions, connected to these phenomena. Manganese mineralization in cave environments pr...
Article
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First reported in the 1960s, offshore freshened groundwater (OFG) has now been documented in most continental margins around the world. In this review we compile a database documenting OFG occurrences and analyze it to establish the general characteristics and controlling factors. We also assess methods used to map and characterize OFG, identify ma...
Article
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The biogeochemical cycling of gold has been proposed from studies focusing on gold particles morphology, surface textures, and associated bacteria living on the surface of gold particles. Additionally, it has been suggested that metabolically active bacteria on particles catalyse gold dissolution and gold re-precipitation processes, i.e., fluid- ba...
Article
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Deep subsurface environments are decoupled from Earth’s surface processes yet diverse, active, and abundant microbial communities thrive in these isolated environments. Microbes inhabiting the deep biosphere face unique challenges such as electron donor/acceptor limitations, pore space/fracture network limitations, and isolation from other microbes...
Article
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It is very important to identify the most developing research areas. The analysis of terminology dynamics, as exemplified by microbiology, enables to make conclusions on the current changes within the corresponding branch of science. The terminological dynamics of the most cited publications demonstrates high relevance of research findings demanded...
Article
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The orthoquartzite Imawarì Yeuta cave hosts exceptional silica speleothems and represents a unique model system to study the geomicrobiology associated to silica amorphization processes under aphotic and stable physical–chemical conditions. In this study, three consecutive evolution steps in the formation of a peculiar blackish coralloid silica spe...
Preprint
Full-text available
Marine sedimentation rate and bottom-water O2 concentration control the remineralization/sequestration of organic carbon across continental margins; but whether/how they shape microbiome architecture (the ultimate effector of all biogeochemical phenomena), across shelf/slope sediments, is unknown. Here we reveal distinct microbiome structures and f...
Article
Full-text available
Manganese (Mn) oxides are among the strongest oxidants and sorbents in the environment, and Mn(II) oxidation to Mn(III/IV) (hydr)oxides includes both abiotic and microbially-mediated processes. While white-rot Basidiomycete fungi oxidize Mn(II) using laccases and manganese peroxidases in association with lignocellulose degradation, the mechanisms b...
Article
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In this work, molecular diversity of two hypersaline microbial mats was compared by Whole Genome Shotgun (WGS) sequencing of environmental DNA from the mats. Brava and Tebenquiche are lakes in the Salar de Atacama, Chile, where microbial communities are growing in extreme conditions, including high salinity, high solar irradiance, and high levels o...
Preprint
Full-text available
Bacterial weathering plays a significant role in rock weathering, yet only a limited number of studies was conducted on this topic. The recent rapid developments in geomicrobiology are expected to increase the pace of research in this area. The extent and duration of the biological weathering processes on mineral and rock samples and minerals prefe...
Article
Full-text available
Biovermiculations are uniquely patterned organic rich sediment formations found on the walls of caves and other subterranean environments. These distinctive worm-like features are the combined result of physical and biological processes. The diverse microbial communities that inhabit biovermiculations may corrode the host rock, form secondary miner...
Article
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Scanning helium-ion microscopy (HIM) is an imaging technique with sub-nanometre resolution and is a powerful tool to resolve some of the tiniest structures in biology. In many aspects, the HIM resembles a field-emission scanning electron microscope (FE-SEM), but the use of helium ions rather than electrons provides several advantages, including hig...
Article
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Bioremediation systems represent an environmentally sustainable approach to degrading industrially generated thiocyanate (SCN⁻), with low energy demand and operational costs and high efficiency and substrate specificity. However, heavy metals present in mine tailings effluent may hamper process efficiency by poisoning thiocyanate-degrading microbia...
Article
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The Iberian Pyrite Belt in southwest Spain hosts some of the largest and diverse extreme acidic environments with textural variation across rapidly changing biogeochemical gradients at multiple scales. After almost three decades of studies, mostly focused on molecular evolution and metagenomics, there is an increasing awareness of the multidiscipli...