Results 21 to 30 of about 1,210 (138)

Persistence of bioconvection‐induced mixed layers in a stratified lake

Limnology and Oceanography, Volume 66, Issue 4, Page 1531-1547, April 2021., 2021
Abstract In situ observations of biophysical interactions in natural waters typically focus on physical mechanisms influencing biological activity. Yet, biological activity can also drive physical processes in aquatic environments. A community of photoautotrophic, motile and heavy bacteria—Chromatium okenii, which requires light, sulfide, and anoxic ...
Oscar Sepúlveda Steiner, Damien Bouffard, Alfred Wüest   +2 more
wiley   +1 more source

Replacement of the Cobalt Center of Vitamin B12 by Nickel: Nibalamin and Nibyric Acid Prepared from Metal‐Free B12 Ligands Hydrogenobalamin and Hydrogenobyric Acid

Angewandte Chemie, Volume 132, Issue 45, Page 20304-20311, November 2, 2020., 2020
Nibalamin (Nibl), the novel NiII analogue of vitamin B12, was synthesized from the metal‐free B12 ligand hydrogenobalamin, prepared from biosynthetic hydrogenobyric acid (Hby). An X‐ray crystal analysis of nibyric acid, the NiII complex of Hby, revealed the first structural details of a nickel complex of a natural corrin ligand.
Christoph Kieninger, Klaus Wurst, Maren Podewitz, Maria Stanley, Evelyne Deery, Andrew D. Lawrence, Klaus R. Liedl, Martin J. Warren, Bernhard Kräutler   +8 more
wiley   +2 more sources

Microbiological Contamination Associated with the Proximity of A Refuse Dumpsite to a River Situated in Okada, Edo State, Nigeria

Journal of Bioresource Management, 2022
This study was performed to evaluate the potential contamination of the Okponha river situated near a dumpsite in Okada, Edo State, Nigeria. Water samples were collected and analyzed for bacteriological and parasitological quality using standard ...
Ebere J. Okafor-Elenwo, Odaro S. Imade , Osazee E. Izevbuwa   +2 more
doaj  

Influence of environmental factors on growth and pigment synthesis by purple thiobacteria

Vìsnik Dnìpropetrovsʹkogo Unìversitetu: Serìâ Bìologìâ, Ekologìâ, 2007
The influence of different environmental factors on growth and pigment biosynthesis by particular strains of purple thiobacteria was investigated. These strains belong to the genus Chromatium, Thiocystis, Thiocapsa and Lamprocystis and were isolated from
Y. О. Pavlova, S. P. Gudz’, S. О. Gnatush   +2 more
doaj   +1 more source

Dynamic cellular complexity of anoxygenic phototrophic sulfur bacteria in the chemocline of meromictic Lake Cadagno.

PLoS ONE, 2017
The meromictic Lake Cadagno is characterized by a compact chemocline with high concentrations of anoxygenic phototrophic purple sulfur bacteria (PSB) and green sulfur bacteria (GSB).
Francesco Danza, Nicola Storelli, Samuele Roman, Samuel Lüdin, Mauro Tonolla   +4 more
doaj   +1 more source

Benefits at the nanoscale: a review of nanoparticle‐enabled processes favouring microbial growth and functionality

Environmental Microbiology, Volume 22, Issue 9, Page 3633-3649, September 2020., 2020
Summary Nanoparticles are ubiquitous and co‐occur with microbial life in every environment on Earth. Interactions between microbes and nanoparticles impact the biogeochemical cycles via accelerating various reaction rates and enabling biological processes at the smallest scales.
Muammar Mansor, Jie Xu
wiley   +1 more source

The Amino Acid Sequence of Chromatium Ferredoxin

Journal of Biological Chemistry, 1970
The amino acid sequence of Chromatium ferredoxin was determined by studies of thermolysin peptides of S-carboxymethylcysteinylferredoxin and chymotryptic peptides of oxidized ferredoxin. The 81 amino acid residues in the molecule have the following sequence: Ala-Leu-Met-Ile-Thr-Asp-Gln-Cys-Ile-Asn-Cys-Asn-Val-Cys-Gln-Pro-Glu-Cys-Pro-Asn-Gly-Ala-Ile-Ser-
H, Matsubara, R M, Sasaki, D K, Tsuchiya, M C, Evans   +3 more
openaire   +2 more sources

Photosynthetic primary production in the Mesoproterozoic

New Phytologist, Volume 251, Issue 1, Page 64-80, July 2026.
Summary The Mesoproterozoic atmosphere had more CO2 and less O2 than at present. While the upper ocean was oxygenated, the deeper ocean was euxinic or ferruginous. Primary production was performed by Chlorobia, Cyanobacteria, Proteobacteria, and Archaeplastida.
Patricia Sánchez‐Baracaldo, John A. Raven   +1 more
wiley   +1 more source

Ecogenomics and limnological dynamics of a new Thiocapsa species blooming in the whole water column of a karstic lake

Limnology and Oceanography, Volume 70, Issue 7, Page 1849-1866, July 2025.
Abstract Purple sulfur bacteria (PSB) of the family Chromatiaceae (Gammaproteobacteria) can perform chemo‐ and photo‐lithoautotrophy (through anoxygenic photosynthesis) in anoxic layers of freshwater stratified (including meromictic) lakes. This group has been extensively studied via physiological and ecological approaches, albeit their genomics has ...
Pedro J. Cabello‐Yeves, Antonio Picazo, Carlos Rochera, Daniel Morant, Eduardo Vicente, David J. Scanlan, Richard J. Puxty, Antonio Camacho   +7 more
wiley   +1 more source

Metabarcoding reveals unique microbial mat communities and evidence of biogeographic influence in low‐oxygen, high‐sulfur sinkholes and springs

Ecology and Evolution, Volume 14, Issue 3, March 2024.
Groundwater‐fed underwater sinkholes and springs create habitats with high‐sulfur, low‐oxygen conditions. Multi‐marker metabarcoding was used to describe microbial mat communities in these extreme aquatic habitats. Unique bacterial and diatom communities were found in five springs in Michigan and Florida, with water parameters and biogeography ...
Davis Fray, Callahan A. McGovern, Dale A. Casamatta, Bopaiah A. Biddanda, Sarah E. Hamsher   +4 more
wiley   +1 more source