Explanipedia

Kinetic study of the effect of Mg2+ and Ca2+ on the hydrolysis of ATP up to 120 °C Open

Christoph Moeller, Denis Testemale, Christian Schmidt, Maria Kokh, François Guyot , et al. · 2025

The role of hydrogen sulfide and trisulfur radical ion in molybdenum transport by hydrothermal fluids: implications for porphyry-epithermal Cu-Au-Mo deposits Open

Maria A. Kokh, Gleb S. Pokrovski, Stephan Klemme, Christian Schmidt, Clément Laskar , et al. · 2025

A transparent IHPV for the in-situ geochemical characterization of magmatic volatile phases and melts Open

Marion Louvel, Denis Testemale, Alain Prat, Eric Lahéra, William Delnet , et al. · 2025

Tungsten solubility and speciation in hydrothermal solutions revealed by in situ X-ray absorption spectroscopy Open

Manuela Borchert, Maria A. Kokh, Marion Louvel, Elena F. Bazarkina, Anselm Loges , et al. · 2025

Tungsten (W) concentrations in fluids in equilibrium with crystalline tungsten oxide are used to determine thermodynamic parameters for W solubility and W species in hydrothermal fluids. The solubility data were measured in situ at high pr…

‘A Transparent Ihpv for the In-Situ Geochemical Characterization of Magmatic Volatile Phases and Melts ‘ Open

Marion Louvel, Denis Testemale, Eric Lahéra, William Delnet, Aneta Slodzcyk , et al. · 2025

Quantifying the transfers of metals and sulfur by geological fluids using in-situ spectroscopy Open

Gleb S. Pokrovski, Maria A. Kokh, Elena F. Bazarkina, Elsa Desmaele, Clément Laskar , et al. · 2025

International audience

First low-temperature synthesis of Cr4+ -doped YAG powders by the Pechini process: unveiling the role of Cr⁶⁺ Open

R. Thevenet, A. Potdevin, François Réveret, Denis Testemale, Philippe Boutinaud , et al. · 2025

Cr 4+ -doped Y3Al5O12 (YAG:Cr 4+ ) is widely employed in photonic devices as a saturable absorber and has recently attracted attention as an infrared gain medium. However, its synthesis typically requires annealing at high temperature (>13…

Tantalum in hydrothermal fluids Open

Bin Hu, Barbara Etschmann, Denis Testemale, Weihua Liu, Qiushi Guan , et al. · 2024

Stable isotopes analysis combined with X-ray absorption spectroscopy reveal the fate of organic waste-borne copper and zinc in amended soils Open

Abraham Pappoe, Zuzana Fekiacova-Castanet, Abel Guihou, Àngela D. Bosch‐Serra, Pierre Deschamps , et al. · 2024

In situ X-ray absorption spectroscopy using the FAME autoclave: a window into fluid-mineral-melt interactions in the Earth’s crust Open

Denis Testemale, Gleb S. Pokrovski, Eric Lahéra, Alain Prat, Isabelle Kieffer , et al. · 2024

International audience

Hydrolysis rate constants of ATP up to 120 °C and 1.6 GPa: Implications for life at extreme conditions Open

Christoph Moeller, Christian Schmidt, Denis Testemale, François Guyot, Maria A. Kokh , et al. · 2024

Novel high-pressure/high-temperature reactor cell for in situ and operando x-ray absorption spectroscopy studies of heterogeneous catalysts at synchrotron facilities Open

Abdallah Nassereddine, Alain Prat, Samy Ould‐Chikh, Eric Lahéra, Olivier Proux , et al. · 2024

This paper presents the development of a novel high-pressure/high-temperature reactor cell dedicated to the characterization of catalysts using synchrotron x-ray absorption spectroscopy under operando conditions. The design of the vitreous…

Nature and coordination geometry of geologically relevant aqueous Uranium(VI) complexes up to 400 ºC: A review and new data Open

Alexander Kalintsev, Qiushi Guan, Joël Brugger, Artas Migdisov, Barbara Etschmann , et al. · 2023

The structure of the uranyl aqua ion (UO₂²⁺) and a number of its inorganic complexes (specifically, UO₂Cl⁺, UO₂Cl₂⁰, UO₂SO₄⁰, [Fo…

In-situ monitoring of ATP hydrolysis at high pressure and temperature: exploring the limits of life Open

Christoph Moeller, Christian Schmidt, Denis Testemale, François Guyot, Maria A. Kokh , et al. · 2023

Oxygen breath of subduction zones revealed by arsenic in serpentinite Open

Gleb S. Pokrovski, Carmen Sanchez‐Valle, Stéphane Guillot, Anastassia Y. Borisova, Manuel Muñoz , et al. · 2023

The role of S3•- in molybdenum transport by hydrothermal fluids revealed by in situ X-ray absorption spectroscopy Open

Maria A. Kokh, Stephan Klemme, Christian Schmidt, Jean‐Louis Hazemann, Denis Testemale , et al. · 2023

Characterisation of uranium redox state in organic-rich marine sediments of the Cretaceous Toolebuc Formation, Australia Open

Evgeniy Bastrakov, Joël Brugger, Barbara Etschmann, Elena F. Bazarkina, Kristina O. Kvashnina , et al. · 2023

Redox dynamics of subduction revealed by arsenic in serpentinite Open

Gleb S. Pokrovski, Carmen Sanchez‐Valle, S. Guillot, Anastassia Y. Borisova, Manuel Muñoz , et al. · 2022

International audience

In situ spectroscopy of hydrothermal fluids: What can we learn with autoclaves and photons? Open

Denis Testemale · 2022

Carbonate complexation enhances hydrothermal transport of rare earth elements in alkaline fluids Open

Marion Louvel, Barbara Etschmann, Qiushi Guan, Denis Testemale, Joël Brugger · 2022

Yttrium speciation in sulfate-rich hydrothermal ore-forming fluids Open

Qiushi Guan, Yuan Mei, Barbara Etschmann, Marion Louvel, Denis Testemale , et al. · 2022

International audience

Speciation and thermodynamic properties of La(III)-Cl complexes in hydrothermal fluids: A combined molecular dynamics and in situ X-ray absorption spectroscopy study Open

Qiushi Guan, Yuan Mei, Barbara Etschmann, Marion Louvel, Denis Testemale , et al. · 2022

International audience

Tin transport in ore fluids - in-situ insight from cassiterite dissolution experiments Open

Manuela Borchert, Pilar Valsera Moreno, Max Wilke, Stephan Klemme, Maria A. Kokh , et al. · 2022

Drastic Ce3+ Insertion Enhancement in YAG Garnet Nanocrystals Through a Solvothermal Route Open

Alexandra Cantarano, Denis Testemale, Estelle Homeyer, Hanako Okuno, A. Potdevin , et al. · 2021

Y 3 Al 5 O 12 (YAG) nanocrystals have been synthesized by a modified solvothermal method (300°C) allowing the incorporation of cerium ions in much larger proportion (up to 30 mol.% with respect to yttrium ions) than ever published. The rea…

The trisulfur radical ion S 3 •− controls platinum transport by hydrothermal fluids Open

Gleb S. Pokrovski, Maria A. Kokh, Elsa Desmaele, Clément Laskar, Elena F. Bazarkina , et al. · 2021

Significance Platinum group elements (PGE) are highly valued by many industrial applications, serve as important geochemical tracers of planetary processes, and are among eagerly sought natural resources of critical trace metals. We show h…

Gold speciation in hydrothermal fluids revealed by in situ high energy resolution X-ray absorption spectroscopy Open

Gleb S. Pokrovski, Elsa Desmaele, Clément Laskar, Elena F. Bazarkina, Denis Testemale , et al. · 2021

Gold mobilization, transfer, and concentration in the Earth’s crust are controlled by hydrothermal sulfur- and chloride-bearing fluids. Yet the exact chemical identity, structure, and stability of Au-bearing species and, in particular, the…

A hydrothermal apparatus for x-ray absorption spectroscopy of hydrothermal fluids at DESY Open

Stephan Klemme, M. Feldhaus, V. Potapkin, Max Wilke, Manuela Borchert , et al. · 2021

We present a new autoclave that enables in situ characterization of hydrothermal fluids at high pressures and high temperatures at synchrotron x-ray radiation sources. The autoclave has been specifically designed to enable x-ray absorption…

An arsenic-driven pump for invisible gold in hydrothermal systems Open

Gleb S. Pokrovski, Céline Escoda, Marc Blanchard, Denis Testemale, Jean‐Louis Hazemann , et al. · 2021

International audience

“Critical” trace elements in major minerals: old questions, new approaches and geochemical applications Open

Gleb S. Pokrovski, Marc Blanchard, Denis Testemale, Jean‐Louis Hazemann · 2021

A synchrotron XAS study of molybdenum speciation in sulfur-bearing hydrothermal fluids Open

Weihua Liu, Barbara Etschmann, Yuan Mei, Denis Testemale, Qiushi Guan , et al. · 2021

Knowledge of the identity and thermodynamic properties of aqueous molybdenum (Mo) species at elevated temperatures and pressures is important for understanding the extraction of Mo from source rocks and the formation of hydrothermal deposi…

Denis Testemale YOU? Author Swipe