Results 81 to 90 of about 5,341 (161)

Spatiotemporal Distribution of Key Pelagic Microbes in a Seasonal Oxygen-Deficient Coastal Upwelling System of the Eastern South Pacific Ocean

Frontiers in Marine Science, 2020
The strong seasonal variability in physical-chemical conditions of the Eastern South Pacific Ocean creates an ideal setting to study spatiotemporal distribution of key marine microbial communities. We herein report a nearly 4-year-long time series of the
Verónica Molina, Verónica Molina, Lucy Belmar, Héctor A. Levipan, Héctor A. Levipan, Salvador Ramírez-Flandes, Salvador Ramírez-Flandes, Cristóbal Anguita, Alexander Galán, Alexander Galán, Alexander Galán, Ivonne Montes, Osvaldo Ulloa, Osvaldo Ulloa   +13 more
doaj   +1 more source

Seasonal Changes in Marine Archaeal Tetraether Lipid Export Depth Linked to Net Primary Productivity

Paleoceanography and Paleoclimatology, Volume 41, Issue 2, February 2026.
Abstract Marine ammonia oxidizing archaea (AOA) produce isoprenoid glycerol dibiphytanyl glycerol tetraethers (GDGTs) which form the basis of seawater temperature proxy TEX86. Although most studies use TEX86 for sea surface temperature (SST) reconstructions, maximum GDGT production occurs at and below the nitracline. Moreover, sedimentary GDGT‐2/GDGT‐3
Addison Rice, Eunmi Park, Gesine Mollenhauer, Daisy Bouwmans, Anouk van Boxtel, Gert J. de Lange, Ryan Paul, Francesca Sangiorgi, Ryan Smulders, Jan‐Berend Stuut, Martin Ziegler, Appy Sluijs, Francien Peterse   +12 more
wiley   +1 more source

Environmental Controls on Crenarchaeol Distributions in Hydrothermal Springs

Environmental Microbiology, Volume 28, Issue 2, February 2026.
The optimal pH and temperature for crenarchaeol (a unique archaeal lipid) production in hydrothermal springs are 7.4°C and 46°C, respectively, which has important implications for archaeal evolution. Our study also indicates that pH is the most important environmental variable for archaeal lipid membrane compositions.
Amanda N. Calhoun, Jerome Blewett, Daniel R. Colman, Maximiliano J. Amenabar, Carolynn M. Harris, Eric S. Boyd, Ann Pearson, William D. Leavitt   +7 more
wiley   +1 more source

Airborne Bacterial Communities: Diversity, Survival Strategies and Functional Roles in the Atmosphere

Environmental Microbiology Reports, Volume 18, Issue 1, February 2026.
This mini‐review synthesises evidence on the taxonomic patterns of airborne microorganisms and the selective pressures they face. We highlight key conserved physiological traits, such as DNA repair and desiccation tolerance, which enable stress‐tolerant members to survive and suggest their potential for activity within the atmospheric environment ...
Jungsoo Park, S. Jane Fowler
wiley   +1 more source

Characterizing Chemoautotrophy and Heterotrophy in Marine Archaea and Bacteria With Single-Cell Multi-isotope NanoSIP

Frontiers in Microbiology, 2019
Characterizing and quantifying in situ metabolisms remains both a central goal and challenge for environmental microbiology. Here, we used a single-cell, multi-isotope approach to investigate the anabolic activity of marine microorganisms, with an ...
Anne E. Dekas, Anne E. Dekas, Alma E. Parada, Alma E. Parada, Xavier Mayali, Jed A. Fuhrman, Jessica Wollard, Peter K. Weber, Jennifer Pett-Ridge   +8 more
doaj   +1 more source

Sea Surface Temperature and Salinity Changes in the Easternmost Mediterranean During the Pre‐Evaporitic Messinian Controlled by the Restriction at Gibraltar

Paleoceanography and Paleoclimatology, Volume 41, Issue 1, January 2026.
Abstract During the latest Miocene, the Mediterranean Basin was affected by extreme paleoceanographic and paleoenvironmental changes culminating with evaporite (gypsum and halite) formation during the Messinian Salinity Crisis (MSC: 5.97–5.33 Ma).
F. Lanterna, W. Krijgsman, L. Lourens, A. Mulch, I. Vasiliev   +4 more
wiley   +1 more source

Metagenomic insights into effects of thiamine supplementation on ruminal non-methanogen archaea in high-concentrate diets feeding dairy cows

BMC Veterinary Research, 2019
Background Overfeeding of high-concentrate diet (HC) frequently leads to subacute ruminal acidosis (SARA) in modern dairy cows’ production. Thiamine supplementation has been confirmed to attenuate HC induced SARA by increasing ruminal pH and ratio of ...
Fuguang Xue, Xuemei Nan, Yunlei Li, Xiaohua Pan, Yuming Guo, Linshu Jiang, Benhai Xiong   +6 more
doaj   +1 more source

Ecological role of Thaumarchaeota in pelagic redox gradients of the Baltic Sea

, 2015
In hypoxic waters within the pelagic redox gradients of the Baltic Sea, Thaumarchaeota occur in high abundances but their contributions to the process of nitrification as well as their adaptations to this habitat remained elusive. In the scope of this thesis, metatranscriptomic analyses, biogeochemical rate measurements, and group-specific ...
openaire   +2 more sources

Controls on the composition of hydroxylated isoGDGTs in cultivated ammonia oxidizing Thaumarchaeota

Abstract. Membrane lipids of ammonia-oxidizing Thaumarchaeota, in particular isoprenoidal glycerol dialkyl glycerol tetraethers (isoGDGTs) and hydroxylated isoGDGTs (OH-isoGDGTs), have been used as biomarkers and as proxies in various environments. Controlled growth experiments have been used to investigate the factors that influence the composition of
Devika Varma, Laura Villanueva, Nicole Bale, Pierre Offre, Gert-Jan Reichart, Stefan Schouten   +5 more
openaire   +2 more sources

Molecular Evolution of the Archaeal DNA-Dependent RNA Polymerase: Cooperative Changes in Subunit Composition and Specific Domains of Small Subunits. [PDF]

Int J Mol Sci
Shematorova EK, Shpakovski GV.
europepmc   +1 more source