Results 101 to 110 of about 31,651 (247)

Ensambles de arqueas y bacterias en la Zona de Mínimo Oxígeno del ecosistema de surgencia de Chile central determinados mediante biomarcadores orgánicos [PDF]

, 2015
Indexación: Web of Science; Scielo.Organic biomarkers were used to investigate the influence of seasonal changes in oxygenation and water chemistry on the distribution of archaea and bacteria in the water column and surface sediments of the continental ...
LEVIPAN, HÉCTOR A., PANTOJA, SILVIO, QUIÑONES, RENATO A., SEPÚLVEDA, JULIO, SRAIN, BENJAMÍN, SUMMONS, ROGER E.   +5 more
core   +2 more sources

Surface‐Driven Protocell Formation in Geologically Relevant Early Earth Environment

ChemSystemsChem, Volume 8, Issue 2, March 2026.
Illustration of a prebiotic early‐Earth environment showing cell‐like protocells (blue spheres) and other complex organic molecules (pink and green spheres) distributed across terrestrial surfaces and within subsurface niches. Volcanic landscapes and mineral‐rich substrates provide diverse geochemical settings for the assembly and evolution of ...
Pamela Knoll, Silvia Holler
wiley   +1 more source

Emergent Macrophytes Act Selectively on Ammonia-Oxidizing Bacteria and Archaea [PDF]

Applied and Environmental Microbiology, 2012
ABSTRACT Ammonia-oxidizing bacteria (AOB) and archaea (AOA) were quantified in the sediments and roots of dominant macrophytes in eight neutral to alkaline coastal wetlands. The AOA dominated in most samples, but the bacterial-to-archaeal amoA gene ratios increased with increasing ammonium levels and pH in
Trias Mansilla, Rosalia, Ruiz Rueda, Olaya, García Lledó, Arantzazu, Vilar Sanz, Ariadna, López i Flores, Rocío, Quintana Pou, Xavier, Hallin, Sara, Bañeras Vives, Lluís   +7 more
openaire   +3 more sources

Abundance and diversity of nitrogen-removing microorganisms in the UASB-anammox reactor.

PLoS ONE, 2019
Anaerobic ammonium oxidation is considered to be the most economical and low-energy biological nitrogen removal process. So far, anammox bacteria have not yet been purified from cultures.
Rui Chen, Junqin Yao, Nuerla Ailijiang, Ruisang Liu, Lei Fang, Yinguang Chen   +5 more
doaj   +1 more source

Spatial distribution and abundances of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in mangrove sediments [PDF]

, 2010
We investigated the diversity, spatial distribution, and abundances of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in sediment samples of different depths collected from a transect with different distances to mangrove forest in ...
Meng Li, Huiluo Cao, Yiguo Hong, Ji-Dong Gu   +3 more
core   +2 more sources

Impact of ENSO on Nitrous Oxide Emissions in the Eastern Tropical Pacific

Global Biogeochemical Cycles, Volume 40, Issue 3, March 2026.
Abstract Nitrous oxide (N2O ${\mathrm{N}}_{2}\mathrm{O}$) is a powerful greenhouse gas, with the ocean contributing ∼4.2 Tg N y−1 to global N2O ${\mathrm{N}}_{2}\mathrm{O}$ emissions. The Eastern Tropical Pacific (ETP) is a hotspot of N2O ${\mathrm{N}}_{2}\mathrm{O}$ emissions due to high N2O ${\mathrm{N}}_{2}\mathrm{O}$ production under low‐oxygen ...
Jana Härri, Daniel McCoy, Meike Vogt, Daniele Bianchi, Nicolas Gruber   +4 more
wiley   +1 more source

Seasonality and depth distribution of the abundance and activity of ammonia oxidizing microorganisms in marine coastal sediments (North Sea) [PDF]

, 2014
Microbial processes such as nitrification and anaerobic ammonium oxidation (anammox) are important for nitrogen cycling in marine sediments. Seasonal variations of archaeal and bacterial ammonia oxidizers (AOA and AOB) and anammox bacteria, as well as ...
Bale, N.J., Hopmans, E.C., Lipsewers, Y.A., Schouten, S., Sinninghe Damsté, J.S., Villanueva, L.   +5 more
core   +2 more sources

Acidification Stimulates N2O Production by Oceanic Nitrifying Bacteria

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 3, March 2026.
Abstract Recent studies have shown changes in the production rates of nitrous oxide (N2O) in aerobic seawater in response to ocean acidification (OA). Understanding how N2O production responds to OA is crucial because N2O is a strong greenhouse gas and stratospheric ozone‐depleting substance emitted from the ocean.
Sakae Toyoda, Takeru Sato, Tatsuro Hirane, Tomoya Matsui, Taketomo Fujiwara, Naohiro Yoshida   +5 more
wiley   +1 more source

Metagenomic Evidence for the Presence of Comammox Nitrospira-Like Bacteria in a Drinking Water System

mSphere, 2016
We report metagenomic evidence for the presence of a Nitrospira-like organism with the metabolic potential to perform the complete oxidation of ammonia to nitrate (i.e., it is a complete ammonia oxidizer [comammox]) in a drinking water system.
Ameet J. Pinto, Daniel N. Marcus, Umer Zeeshan Ijaz, Quyen Melina Bautista-de lose Santos, Gregory J. Dick, Lutgarde Raskin   +5 more
doaj   +1 more source

Autotrophic growth of bacterial and archaeal ammonia oxidizers in freshwater sediment microcosms incubated at different temperatures

, 2013
Both bacteria and archaea potentially contribute to ammonia oxidation, but their roles in freshwater sediments are still poorly understood. Seasonal differences in the relative activities of these groups might exist, since cultivated archaeal ammonia ...
Conrad, R., Dumont, Marc, Hernandez Garcia, Marcela, Jia, Z., Ke, X., Wang, B., Wu, Y.   +6 more
core   +1 more source