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Metabolic features that select for Bathyarchaeia in modern ferruginous lacustrine subsurface sediments.
ISME Commun
January 2024
GFZ German Research Centre for Geosciences, Section Geomicrobiology, Telegrafenberg, 14473 Potsdam, Germany.
Ferruginous conditions prevailed through Earth's early oceans history, yet our understanding of biogeochemical cycles in anoxic iron-rich, sulfate-poor sediments remains elusive in terms of redox processes and organic matter remineralization. Using comprehensive geochemistry, cell counts, and metagenomic data, we investigated the taxonomic and functional distribution of the microbial subsurface biosphere in Lake Towuti, a stratified ferruginous analogue. Below the zone in which pore water becomes depleted in electron acceptors, cell densities exponentially decreased while microbial assemblages shifted from iron- and sulfate-reducing bacterial populations to fermentative anaerobes and methanogens, mostly selecting Bathyarchaeia below the sulfate reduction zone.
View Article and Find Full Text PDFCo-exposure of ferruginous components of subway particles with lipopolysaccharide impairs vascular function: A comparative study with ambient particulate matter.
Ecotoxicol Environ Saf
December 2024
Environmental Health Division, Graduate School of Global Environmental Studies, Kyoto University, Kyoto, Japan; Institute for International Academic Research, Kyoto University of Advanced Science, Kyoto, Japan; Research Institute for Coexistence and Health Science, Kyoto University of Advanced Science, Kyoto, Japan.
Article Synopsis
- Several studies have established a connection between subway and ambient particle exposure and negative health effects, like inflammation and vascular issues, but the combined impact of these pollutants with lipopolysaccharide (LPS) remains largely unexplored.
- The research focused on the health effects of iron oxide particles (found in subway dust) compared to urban aerosols and vehicle exhaust, finding that iron oxides are more harmful, causing greater endothelial cell damage and altering key vascular proteins.
- When iron oxides are combined with LPS, there's a notable increase in inflammation and immune responses in the body, indicating that subway particles may pose greater health risks than other types of urban pollutants.
Ferruginous components of particulate matters in subway environments, α-FeO or FeO, exacerbates allergies.
Environ Pollut
August 2024
Graduate School of Global Environmental Studies, Kyoto University, Kyoto, 606-8501, Japan; Institute for International Academic Research, Kyoto University of Advanced Science, Kyoto, 615-8577, Japan.
The respiratory effects of particulate matter (PM) in subway station platforms or tunnels have attracted considerable research attention. However, no studies have characterized the effects of subway PM on allergic immune responses. In this study, iron oxide (α-FeO and FeO) particles-the main components of subway PM-were intratracheally administered to BALB/c mice where ovalbumin (OVA) induced allergic pulmonary inflammation.
View Article and Find Full Text PDFComments on "was hydrogen peroxide present before the arrival of oxygenic photosynthesis? The important role of iron(II) in the archean ocean".
Redox Biol
May 2024
Department of Earth Sciences, The University of Hong Kong, Hong Kong, 999077, China. Electronic address:
Recent research has hypothesized that hydrogen peroxide (HO) may have emerged from abiotic geochemical processes during the Archean eon (4.0-2.5 Ga), stimulating the evolution of an enzymatic antioxidant system in early life.
View Article and Find Full Text PDFDissolved silica affects the bulk iron redox state and recrystallization of minerals generated by photoferrotrophy in a simulated Archean ocean.
Geobiology
February 2024
Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan, USA.
Chemical sedimentary deposits called Banded Iron Formations (BIFs) are one of the best surviving records of ancient marine (bio)geochemistry. Many BIF precursor sediments precipitated from ferruginous, silica-rich waters prior to the Great Oxidation Event at ~2.43 Ga.
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