Publications de Elena Suvorova Buffat

Reducing conditions influence U(IV) accumulation in sediments during in-situ bioremediation

Vincent Noel, Elena Suvorova Buffat, Rizlan Bernier-Latmani, Daniel Scott Alessi

2024

Structure, Oxygen Content and Electric Properties of Titanium Nitride Electrodes in TiNx/La:HfO2/TiNx Stacks Grown by PEALD on SiO2/Si

This work reports experimental results of the quantitative determination of oxygen and band gap measurement in the TiNx electrodes in planar TiNx top/La:HfO2/TiNx bottom MIM stacks obtained by plasma enhanced atomic layer deposition on SiO2. Methodological ...

2022

Structure evolution, bandgap, and dielectric function in La-doped hafnium oxide thin layer subjected to swift Xe ion irradiation

Philippe Buffat, Elena Suvorova Buffat

High-resolution transmission electron microscopy, electron diffraction, and electron energy-loss spectroscopy provide information on the structural evolution, dielectric function, and bandgap values of nanocrystalline 10nm thick lanthanum doped hafnia (La: ...

AMER INST PHYSICS2020

Energy dependent structure of Xe ion tracks in YBCO and the effect on the superconductive properties in magnetic fields

Philippe Buffat, Elena Suvorova Buffat

The morphology and structure of damaged regions (tracks) produced by swift heavy 167, 77, and 46 MeV 132Xe23+ ions in YBCO-based second generation industrial high temperature superconductors wires (2G HTS) were studied using transmission electron microscop ...

2019

Effects of Kr and Xe ion irradiation on the structure of Y2O3 nanoprecipitates in YBCO thin film conductors

Philippe Buffat, Elena Suvorova Buffat

The response of Y2O3 nanoprecipitates in a 1-mu m YBa2Cu3O7-x layer from a superconducting wire Ag/YBCO/buffer metal oxides/Hastelloy to 107 MeV Kr and 167 MeV Xe ion irradiation was investigated using a combination of transmission electron microscopy, dif ...

2018

Chromate Resistance Mechanisms in Leucobacter chromiiresistens

Elena Suvorova Buffat, Rizlan Bernier-Latmani

Chromate is one of the major anthropogenic contaminants on Earth. Leucobacter chromiiresistens is a highly chromate-resistant strain, tolerating chromate concentrations in LB medium of up to 400 mM. In response to chromate stress, L. chromiiresistens forms ...

AMER SOC MICROBIOLOGY2018

Arsenic speciation in Mekong Delta sediments depends on their depositional environment

Elena Suvorova Buffat, Rizlan Bernier-Latmani, Manon Frutschi, Barbora Bártová, Yuheng Wang, Laurent Louis José Charlet, Maria Pilar Asta Andres

2018

Structure of precipitates and orientation relationships in Al, Ge, Mo-doped higher manganese silicide crystals

Philippe Buffat, Marco Cantoni, Elena Suvorova Buffat

The structure of Al, Ge, Mo-doped Higher Manganese Silicide (HMS) crystals with the general formulas Mn(Si0.99Ge0.01)(1.75), Mn(Si0.995Ge0.005)(1.75) and (Mn0.98Mo0.02)(Si0.98Ge0.02)(1.75)Al-0.01 was investigated by scanning and transmission electr ...

Taylor & Francis Ltd2017

Long-term in-situ oxidation of biogenic uraninite in an alluvial aquifer: impact of dissolved oxygen and calcium

Elena Suvorova Buffat, Rizlan Bernier-Latmani, Harish Veeramani, Daniel Scott Alessi

Oxidative dissolution controls uranium release to (sub)oxic pore waters from biogenic uraninite produced by natural or engineered processes, such as bioremediation Laboratory studies show that uraninite dissolution is profoundly influenced by dissolved oxy ...

Amer Chemical Soc2015

Mechanism of formation of silver nanoparticles in MAG-DMAEMA copolymer aqueous solutions

Philippe Buffat, Elena Suvorova Buffat

Dispersed Ag nanoparticles were prepared in aqueous solutions in the presence of pure poly[2-(dimethylamino)ethyl methacrylate] (poly-DMAEMA), poly[2-deoxy-2-methacrylamido-d-glucose] (poly-MAG), and their copolymers of poly[MAG–DMAEMA] with different mole ...

Springer Verlag2015

Fe(III) reduction during pyruvate fermentation by Desulfotomaculum reducens strain MI-1

Elena Suvorova Buffat, Julien Maillard, Rizlan Bernier-Latmani, Elena Cristina Dalla Vecchia

Desulfotomaculum reducens MI-1 is a Gram-positive, sulfate-reducing bacterium also capable of reducing several metals, among which is Fe(III). Very limited knowledge is available on the potential mechanism(s) of metal reduction among Gram-positive bacteria ...

Wiley-Blackwell2014

Speciation and reactivity of uranium products formed during in situ bioremediation in a shallow alluvial aquifer

Elena Suvorova Buffat, Rizlan Bernier-Latmani, Daniel Scott Alessi

In this study, we report the results of in situ U(VI) bioreduction experiments at the Integrated Field Research Challenge site in Rifle, Colorado, USA. Columns filled with sediments were deployed into a groundwater well at the site and, after a period of c ...

Amer Chemical Soc2014

Characterization of the surfaceome of the metal-reducing bacterium Desulfotomaculum reducens

Elena Suvorova Buffat, Diego Chiappe, Rizlan Bernier-Latmani, Elena Cristina Dalla Vecchia, Romain Hamelin, Paul Pao-Yun Shao

Desulfotomaculum reducens strain MI-1 is a Gram-positive, sulfate-reducing bacterium also capable of reducing Fe(III). Metal reduction in Gram-positive bacteria is poorly understood. Here, we investigated Fe(III) reduction with lactate, a non-fermentable s ...

Frontiers Media SA2014

Structure analysis of the YBCO layer in Ag/YBCO/metal oxide buffer/Hastelloy composite tape before and after 107 MeV Kr17+ irradiation

Philippe Buffat, Marco Cantoni, Elena Suvorova Buffat

The effects of 107 MeV Kr-84(17+) ion irradiation on YBa2Cu3O7-x-based second-generation coated conductors were investigated using a combination of transmission electron microscopy, diffraction and X-ray energy dispersive spectrometry. Defects 3-5 nm in di ...

Pergamon-Elsevier Science Ltd2014

Combined scanning transmission X-ray and electron microscopy for the characterization of bacterial endospores

Elena Suvorova Buffat, Rizlan Bernier-Latmani, Paul Pao-Yun Shao, Imrich Barak, Jan Jamroskovic

Endospores (also referred to as bacterial spores) are bacterial structures formed by several bacterial species of the phylum Firmicutes. Spores form as a response to environmental stress. These structures exhibit remarkable resistance to harsh environmenta ...

Wiley-Blackwell2014

Metamorphic InAlAs/InGaAs/InAlAs/GaAs HEMT heterostructures containing strained superlattices and inverse steps in the metamorphic buffer

Philippe Buffat, Benjamin Dwir, Elena Suvorova Buffat

Metamorphic InxAl1-xAs buffer design features influence on electrophysical and structural properties of the heterostructures was investigated. Two types of MHEMT heterostructures In0.70Al0.30As/In0.76Ga0.24As with novel design contained inverse steps or st ...

Elsevier Science Bv2013

Uranium redox transition pathways in acetate-amended sediments

Elena Suvorova Buffat, Rizlan Bernier-Latmani, Daniel Scott Alessi, Malgorzata Alicja Stylo

Redox transitions of uranium [from U(VI) to U(IV)] in low-temperature sediments govern the mobility of uranium in the environment and the accumulation of uranium in ore bodies, and inform our understanding of Earth's geochemical history. The molecular-scal ...

National Academy of Sciences2013

Mobile uranium(IV)-bearing colloids in a mining-impacted wetland

Elena Suvorova Buffat, Rizlan Bernier-Latmani, Manon Frutschi, Yuheng Wang

Tetravalent uranium is commonly assumed to form insoluble species, resulting in the immobilization of uranium under reducing conditions. Here we present the first report of mobile U(IV)-bearing colloids in the environment, bringing into question this commo ...

Nature Research2013

Influence of metamorphic buffer design on electrophysical and structural properties of MHEMT nanoheterostructures In0.7Al0.3As/In0.7Ga0.3As/In0.7Al0.3As/GaAs

Philippe Buffat, Benjamin Dwir, Elena Suvorova Buffat

Metamorphic InxAl1-xAs buffer design influence on electrophysical and structural properties of the MHEMT nanoheterostructures was investigated. Electrophysical properties of the nanoheterostructures were characterized by Hall measurements, while the struc ...

2012

Quantitative separation of monomeric U(IV) from UO2 in products of U(VI) reduction

Elena Suvorova Buffat, Rizlan Bernier-Latmani, Harish Veeramani, Daniel Scott Alessi, Benjamin Uster

The reduction of soluble hexavalent uranium to tetravalent uranium can be catalyzed by bacteria and minerals. The end-product of this reduction is often the mineral uraninite, which was long assumed to be the only product of U(VI) reduction. However, recen ...

2012