Results 111 to 120 of about 17,871 (238)

Early evolution of purple retinal pigments on Earth and implications for exoplanet biosignatures

, 2018
We propose that retinal-based phototrophy arose early in the evolution of life on Earth, profoundly impacting the development of photosynthesis and creating implications for the search for life beyond our planet.
DasSarma, Shiladitya, Schwieterman, Edward W.   +1 more
core   +1 more source

Influence of periparturient and postpartum diets on rumen methanogen communities in three breeds of primiparous dairy cows [PDF]

, 2016
Background: Enteric methane from rumen methanogens is responsible for 25.9 % of total methane emissions in the United States. Rumen methanogens also contribute to decreased animal feed efficiency. For methane mitigation strategies to be successful, it is
André-Denis G. Wright, Jana Kraft, Laura M. Cersosimo, Melissa L. Bainbridge   +3 more
core   +1 more source

Highly Variable Methane Production and Fluxes in a Hypereutrophic Lake Despite Uniform Bathymetry and Sediment Chemistry

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 5, May 2026.
Abstract Hypereutrophic lakes support high sedimentation of labile organic carbon, promoting sediment anoxia and GHG potential production. Lakes with complex morphometry exhibit extensive spatial heterogeneity in sediment methane (CH4) and carbon dioxide CO2 dynamics. We wondered: do lakes with uniform bathymetry show low spatial variation in sediments'
Emma Polauke, Jonas Stage Sø, Kaj Sand‐Jensen, Kasper Reitzel, Theis Kragh   +4 more
wiley   +1 more source

High resolution depth distribution of Bacteria, Archaea, methanotrophs, and methanogens in the bulk and rhizosphere soils of a flooded rice paddy

Frontiers in Microbiology, 2015
The communities and abundances of methanotrophs and methanogens, along with the oxygen, methane, and total organic carbon (TOC) concentrations, were investigated along a depth gradient in a flooded rice paddy.
Hyo Jung eLee, Sang Eun eJeong, Pil Joo eKim, Eugene Lewis Madsen, Che Ok eJeon   +4 more
doaj   +1 more source

Ecosystem‐Scale Methane Emissions From Peatlands of the Hudson Bay Lowlands

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 5, May 2026.
Abstract Northern peatlands are important sources of methane (CH4) in the atmosphere. However, the magnitude of CH4 emissions and their response to environmental factors are poorly constrained within the Hudson Bay Lowlands (HBL), the largest contiguous peatland complex in North America. This study investigated seasonal (April–November) eddy covariance‐
A. Bieniada, E. R. Humphreys
wiley   +1 more source

Putative Analogs of Pyrite Suns Forming in Proglacial Alaska Mudflats

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 5, May 2026.
Abstract Disc‐shaped pyrite suns of the Pennsylvanian age Anna Shale are thought to have formed where pressure restricted pyrite crystal growth to a flattened disc shape during diagenesis at the Anna Shale and the underlying Herrin coal boundary.
Heather L. Fair, Trinity L. Hamilton, Jeff R. Havig   +2 more
wiley   +1 more source

The Dairy Ruminant Gut Microbiome: Profile, Responsiveness to Seasonality and Impact on Milk Quality

Environmental Microbiology, Volume 28, Issue 5, May 2026.
The dairy ruminant gut microbiome that is shaped by host and diet is affected by seasonality and rearing. These factors can impact dairy productivity and milk quality potentially through the gut microbiota. ABSTRACT The gut microbiome (GM) and particularly the rumen microbiome (RM) affect the ruminant health and they are associated with milk quality ...
Alexandra Ntemiri, Adamantini Kyriacou, Myrsini Kakagianni   +2 more
wiley   +1 more source

Perspectives for Advancing Biotechnological Succinic Acid Production

Microbial Biotechnology, Volume 19, Issue 5, May 2026.
Succinic acid is an important molecule for sustainable chemical manufacturing, but its industrial production faces high costs and sustainability challenges, which are linked to feedstocks and excessive acid/base consumption. This opinion explores production routes based on next‐generation feedstocks and low‐pH fermentations to inspire novel cost ...
Christoph Gunkel, Bastian Blombach
wiley   +1 more source

Low Climate Benefit of Nordic Coastal Marshes: Site Conditions Outweigh Grazing Effects and Shape Trade‐Offs Between Carbon Storage and Its Stability

Global Change Biology, Volume 32, Issue 5, May 2026.
Conceptual diagram of soil carbon cycling across climatic and environmental gradients in Nordic marshes and grazing effect. Denmark's warmer climate, high nutrient inputs, elevated salinity, and sandy soils promote rapid microbial decomposition of predominantly labile and root‐derived OC, driving high CO2 emissions and relatively high although unstable
Carmen Leiva‐Dueñas, Gary T. Banta, Christoffer Boström, Franziska Eller, Johan Eklöf, Line Holm Andersen, Kai Jensen, Marianna Lanari, Ella Logemann, Pere Masque, Thomas Ostertag, Christoph Reisdorff, Anaïs Richard, Anu Vehmaa, Jukka Alm, Mikael von Numers, Dorte Krause‐Jensen   +16 more
wiley   +1 more source

Structural determination of archaeal UDP-N-acetylglucosamine 4-epimerase from Methanobrevibacter ruminantium M1 in complex with the bacterial cell wall intermediate UDP-N-acetylmuramic acid [PDF]

, 2018
The crystal structure of UDP-N-acetylglucosamine 4-epimerase (UDP-GlcNAc 4-epimerase; WbpP; EC 5.1.3.7), from the archaeal methanogen Methanobrevibacter ruminantium strain M1, was determined to a resolution of 1.65 Å. The structure, with a single monomer
Carbone, V, Ronimus, RS, Sang, C, Schofield, L, Sutherland-Smith, A   +4 more
core