Results 101 to 110 of about 510,768 (248)

Effects of a Perennial Drought on Nitrate Fate in an Agriculturally Dominated Mesoscale Catchment as Constrained by Stable Isotope Investigations

Hydrological Processes, Volume 40, Issue 1, January 2026.
Our study shows that nitrate concentrations in both groundwater and surface water decreased during a 3‐year drought at the mesoscale river basin level, especially in agricultural regions with anthropogenic nitrate sources. This decline is due to temporary retention and dilution in the soil zone rather than denitrification, as suggested by the stable ...
Christin Mueller, Ronald Krieg, Ralf Merz, Kay Knöller   +3 more
wiley   +1 more source

Preliminary Assessment of Microbial Community Structure of Wind-Tidal Flats in the Laguna Madre, Texas, USA

Biology, 2020
Aside from two samples collected nearly 50 years ago, little is known about the microbial composition of wind tidal flats in the hypersaline Laguna Madre, Texas. These mats account for ~42% of the lagoon’s area.
I.-Shuo Huang, Lee J. Pinnell, Jeffrey W. Turner, Hussain Abdulla, Lauren Boyd, Eric W. Linton, Paul V. Zimba   +6 more
doaj   +1 more source

Fungal and Prokaryotic Activities in the Marine Subsurface Biosphere at Peru Margin and Canterbury Basin Inferred from RNA-Based Analyses and Microscopy

Frontiers in Microbiology, 2016
The deep sedimentary biosphere, extending 100s of meters below the seafloor harbors unexpected diversity of Bacteria, Archaea, and microbial eukaryotes.
M. Pachiadaki, V. Rédou, D. Beaudoin, G. Burgaud, V. Edgcomb   +4 more
semanticscholar   +1 more source

Analysis into the viability of pea gravel as a diffusing material for biostimulation systems in petroleum hydrocarbon‐contaminated soils

Journal of Environmental Quality, Volume 55, Issue 1, January/February 2026.
Abstract Injecting biostimulatory solutions around underground storage tanks (UGSTs) promotes petroleum hydrocarbon (PHC) bioremediation without the use of intrusive infrastructure. Yet, it is unclear how the interaction between porous bedding material (i.e., pea gravel) and biostimulatory solutions impacts PHC biodegradation rates.
Aimée D. Schryer, Alejandro Alvarez Ruiz, Kris Bradshaw, Steven D. Siciliano   +3 more
wiley   +1 more source

Regulation-Structured Dynamic Metabolic Model Provides a Potential Mechanism for Delayed Enzyme Response in Denitrification Process [PDF]

, 2017
In a recent study of denitrification dynamics in hyporheic zone sediments, we observed a significant time lag (up to several days) in enzymatic response to the changes in substrate concentration.
Chen, Xingyuan, Fredrickson, Jim K., Li, Minjing, Liu, Chongxuan, Scheibe, Timothy D., Song, Hyun-Seob, Song, Xuehang, Stegen, James C., Thomas, Dennis G., Zachara, John M.   +9 more
core   +1 more source

Analysis of nifH-RNA reveals phylotypes related to Geobacter and Cyanobacteria as important functional components of the N2-fixing community depending on depth and agricultural use of soil [PDF]

, 2017
In this survey, a total of 80 787 reads and 28 171 unique NifH protein sequences were retrieved from soil RNA. This dataset extends our knowledge about the structure and diversity of the functional diazotrophic communities in agricultural soils from ...
Aguilar, Orlando Mario, Behrends Kraemer, Filipe, Calderoli, Priscila Anabel, Collavino, Mónica Mariana, Morrás, Héctor José María   +4 more
core   +3 more sources

Dissolved and Particulate Methylated Mercury in a Highly Productive Area of the Southern Ocean

Global Biogeochemical Cycles, Volume 40, Issue 1, January 2026.
Abstract Methylated mercury (MeHg), including dimethylmercury and monomethylmercury (MMHg), is a pollutant of concern because it biomagnifies in marine biota. The formation of MeHg in the oceans, specifically at highly productive regions and at high oxygen levels, remains elusive.
Harald Biester, Marta Pérez‐Rodríguez, Adelina Calean, Marco Benkhettab Sindlev, Florian Lüskow, Evgeny A. Pakhomov, Ingrid Stimac, Scarlett Trimborn, Aurélie Dufour, Natalia Torres‐Rodriguez, Lars‐Eric Heimbürger‐Boavida, Frank Wenzhöfer, Ronnie N. Glud   +12 more
wiley   +1 more source

Ultradeep Microbial Communities at 4.4 km within Crystalline Bedrock: Implications for Habitability in a Planetary Context

Life, 2020
The deep bedrock surroundings are an analog for extraterrestrial habitats for life. In this study, we investigated microbial life within anoxic ultradeep boreholes in Precambrian bedrock, including the adaptation to environmental conditions and lifestyle
Lotta Purkamo, Riikka Kietäväinen, Maija Nuppunen-Puputti, Malin Bomberg, Claire Cousins   +4 more
doaj   +1 more source

Hypotheses for near-surface exchange of methane on Mars [PDF]

, 2016
The Curiosity rover recently detected a background of 0.7 ppb and spikes of 7 ppb of methane on Mars. This in situ measurement reorients our understanding of the Martian environment and its potential for life, as the current theories do not entail any ...
Bloom, A. Anthony, Gao, Peter, Hu, Renyu, Miller, Charles E., Yung, Yuk L.   +4 more
core   +3 more sources

Optofluidic Single-Cell Genome Amplification of Sub-micron Bacteria in the Ocean Subsurface

Frontiers in Microbiology, 2018
Optofluidic single-cell genome amplification was used to obtain genome sequences from sub-micron cells collected from the euphotic and mesopelagic zones of the northwestern Sargasso Sea.
Z. Landry, K. Vergin, Christopher Mannenbach, S. Block, Qiao Yang, P. Blainey, C. Carlson, S. Giovannoni   +7 more
semanticscholar   +1 more source