Results 61 to 70 of about 3,204,513 (373)

Rock-Hosted Subsurface Biofilms: Mineral Selectivity Drives Hotspots for Intraterrestrial Life

Frontiers in Microbiology, 2021
The continental deep subsurface is likely the largest reservoir of biofilm-based microbial biomass on Earth, but the role of mineral selectivity in regulating its distribution and diversity is unclear.
Caitlin P. Casar, Brittany R. Kruger, Magdalena R. Osburn   +2 more
doaj   +1 more source

Plasmid Incidence in Bacteria from Deep Subsurface Sediments [PDF]

Applied and Environmental Microbiology, 1988
Bacteria were isolated from deep terrestrial subsurface sediments underlying the coastal plain of South Carolina. A total of 163 isolates from deep sediments, surface soil, and return drill muds were examined for plasmid DNA content and resistance to the antibiotics penicillin, ampicillin, carbenicillin, streptomycin, kanamycin, and ...
Jim Fredrickson, Ronald J. Hicks, S. W. Li, Fred J. Brockman   +3 more
openalex   +3 more sources

Identification and Removal of Contaminant Sequences From Ribosomal Gene Databases: Lessons From the Census of Deep Life

Frontiers in Microbiology, 2018
Earth’s subsurface environment is one of the largest, yet least studied, biomes on Earth, and many questions remain regarding what microorganisms are indigenous to the subsurface. Through the activity of the Census of Deep Life (CoDL) and the Deep Carbon
Cody S. Sheik, Brandi Kiel Reese, Katrina I. Twing, Jason B. Sylvan, Sharon L. Grim, Matthew O. Schrenk, Mitchell L. Sogin, Frederick S. Colwell   +7 more
doaj   +1 more source

Microbial Communities in a Serpentinizing Aquifer Are Assembled through Strong Concurrent Dispersal Limitation and Selection

mSystems, 2021
In recent years, our appreciation of the extent of habitable environments in Earth’s subsurface has greatly expanded, as has our understanding of the biodiversity contained within.
Lindsay I. Putman, Mary C. Sabuda, William J. Brazelton, Michael D. Kubo, Tori M. Hoehler, Tom M. McCollom, Dawn Cardace, Matthew O. Schrenk   +7 more
doaj   +1 more source

Seismic Amplification by Deep Subsurface and Proposal of a New Proxy

Engineering, Technology & Applied Science Research, 2020
Codes of practice and ground motion prediction equations involve ground structure proxies to account for seismic amplification. Although the ground consists of both shallow and deep subsurface, proxies are mainly related to the shallow subsurface as it ...
T. Nagao
semanticscholar   +1 more source

Using Deep Learning to Improve Ensemble Smoother: Applications to Subsurface Characterization [PDF]

Water Resources Research, 2020
Ensemble smoother (ES) has been widely used in various research fields to reduce the uncertainty of the system‐of‐interest. However, the commonly adopted ES method that employs the Kalman formula, that is, ES(K), does not perform well when the ...
Jiangjiang Zhang, Q. Zheng, Laosheng Wu, L. Zeng   +3 more
semanticscholar   +1 more source

Changes in the deep subsurface microbial biosphere resulting from a field-scale CO2 geosequestration experiment

Frontiers in Microbiology, 2014
Subsurface microorganisms may respond to increased CO2 levels in ways that significantly affect pore fluid chemistry. Changes in CO2 concentration or speciation may result from the injection of supercritical CO2 (scCO2) into deep aquifers.
Andre eMu, Andre eMu, Andre eMu, Chris eBoreham, Chris eBoreham, Henrietta X Leong, Henrietta X Leong, Ralf eHaese, Ralf eHaese, John W Moreau, John W Moreau   +10 more
doaj   +1 more source

Physics‐Informed Deep Neural Networks for Learning Parameters and Constitutive Relationships in Subsurface Flow Problems

Water Resources Research, 2020
We present a physics‐informed deep neural network (DNN) method for estimating hydraulic conductivity in saturated and unsaturated flows governed by Darcy's law.
A. Tartakovsky, Carlos Ortiz Marrero, P. Perdikaris, G. Tartakovsky, D. Barajas-Solano   +4 more
semanticscholar   +1 more source

Anisotropic time-dependent behaviors of shale under direct shearing and associated empirical creep models

Journal of Rock Mechanics and Geotechnical Engineering
Understanding the anisotropic creep behaviors of shale under direct shearing is a challenging issue. In this context, we conducted shear-creep and steady-creep tests on shale with five bedding orientations (i.e.
Yachen Xie, Michael Z. Hou, Hejuan Liu, Cunbao Li   +3 more
doaj   +1 more source

Trends and Future Challenges in Sampling the Deep Terrestrial Biosphere

Frontiers in Microbiology, 2014
Research in the deep terrestrial biosphere is driven by interest in novel biodiversity and metabolisms, biogeochemical cycling, and the impact of human activities on this ecosystem.
Michael J Wilkins, Michael J Wilkins, Rebecca eDaly, Paula J Mouser, Ryan eTrexler, Kelly C Wrighton, Shikha eSharma, David R Cole, Jennifer F Biddle, Elizabeth eDenis, Jim K Fredrickson, Thomas L. Kieft, Tullis C Onstott, Lee ePetersen, Susan M Pfiffner, Tommy J Phelps, Matthew O Schrenk   +16 more
doaj   +1 more source