Results 31 to 40 of about 208,382 (245)

Depth-dependent geochemical and microbiological gradients in Fe(III) deposits resulting from coal mine-derived acid mine drainage.

Frontiers in Microbiology, 2014
We evaluated the depth-dependent geochemistry and microbiology of sediments that have developed via the microbially-mediated oxidation of Fe(II) dissolved in acid mine drainage (AMD), giving rise to a 8-10 cm deep iron mound that is composed primarily of
Justin S. Brantner, Zachary J. Haake, John E. Burwick, Christopher M. Menge, Shane T. Hotchkiss, John eSenko   +5 more
doaj   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

Iron oxidation kinetics and phosphate immobilization along the flow-path from groundwater into surface water [PDF]

Hydrology and Earth System Sciences, 2014
The retention of phosphorus in surface waters through co-precipitation of phosphate with Fe-oxyhydroxides during exfiltration of anaerobic Fe(II) rich groundwater is not well understood. We developed an experimental field set-up to study Fe(II) oxidation
B. van der Grift, J. C. Rozemeijer, J. Griffioen, Y. van der Velde   +3 more
doaj   +1 more source

An unexpected alternative viologen electron mediator site in tungsten‐containing formate dehydrogenase

FEBS Letters, EarlyView.
An unexpected alternative interaction site for ethyl viologen was identified in formate dehydrogenase 1 from Methylorubrum extorquens. Combined mutagenesis, kinetic analysis, and docking revealed that aromatic residues near an iron–sulfur cluster enable flavin mononucleotide‐independent electron transfer, offering a framework for engineering improved ...
Eleni G. Poloniataki, Yong Hwan Kim
wiley   +1 more source

Experimental isotopic shifts in Ni II and Fe II [PDF]

Monthly Notices of the Royal Astronomical Society, 1992
This work reports about measurements of isotope structure in Ni II and Fe II. We have used spectra from hollow-cathode lamps that have been recorded with the Fourier Transform Spectrometer at Kitt Peak National Observatory. Measurements of isotope shifts yield useful information about atomic and nuclear properties.
Maria Rosberg, Ulf Litzén, Sveneric Johansson   +2 more
openaire   +1 more source

Unravelling the complex structure of the Fe II emission region in Type 1 active galactic nuclei

Astronomy & Astrophysics
Aims. Using a large sample of Type 1 active galactic nucleus spectra, we investigated the complex structure of the Fe II emission region with the aim of understanding the atomic processes responsible for the enhancement of the Fe II emission. We explored
Kovačević-Dojčinović Jelena, Dojčinović Ivan, Popović Luka Č.   +2 more
doaj   +1 more source

A Single Bacterium Capable of Oxidation and Reduction of Iron at Circumneutral pH

Microbiology Spectrum, 2021
Fe(II)-oxidizing microorganisms and Fe(III)-reducing microorganisms, which drive the biogeochemical Fe cycle on the Earth’s surface, are phylogenetically and ecologically diverse.
Shingo Kato, Moriya Ohkuma
doaj   +1 more source

Cell geometry and membrane protein crowding constrain Escherichia coli growth rate, overflow metabolism, respiration, and maintenance energy

FEBS Letters, EarlyView.
The physical dimensions and shape of bacterial cells define the surface area available to acquire nutrients and the volume available for synthesizing proteins and DNA. Here, we use computational systems biology to decode the importance of cell geometry as a major determinant of prokaryotic phenotype, including growth rate and metabolic efficiency. This
Ross P. Carlson, Tomáš Gedeon, Mauricio Garcia Benitez, Campbell Putnam, William R. Harcombe, Radhakrishnan Mahadevan, Ashley E. Beck   +6 more
wiley   +1 more source

Diiron Bridged-Thiolate Complexes That Bind N₂ at the Fe^IIFe^II, Fe^IIFe^I, and Fe^IFe^I Redox States [PDF]

Journal of the American Chemical Society, 2015
All known nitrogenase cofactors are rich in both sulfur and iron and are presumed capable of binding and reducing N2. Nonetheless, synthetic examples of transition metal model complexes that bind N2 and also feature sulfur donor ligands remain scarce.
Sidney E, Creutz, Jonas C, Peters
openaire   +2 more sources

Comparing the Degradation Potential of Copper(II), Iron(II), Iron(III) Oxides, and Their Composite Nanoparticles in a Heterogeneous Photo-Fenton System

Nanomaterials, 2021
Heterogeneous photo-Fenton systems offer efficient solutions for the treatment of wastewaters in the textile industry. This study investigated the fabrication and structural characterization of novel peculiar-shaped CuIIO, FeIII2O3, and FeIIO ...
Asfandyar Khan, Zsolt Valicsek, Ottó Horváth   +2 more
doaj   +1 more source