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The role of nanominerals and mineral nanoparticles in the transport of toxic trace metals: Field-flow fractionation and analytical TEM analyses after nanoparticle isolation and density separation

Nanominerals and mineral nanoparticles from a mining-contaminated river system were examined to determine their potential to co-transport toxic trace metals. A recent large-scale dam removal project on the Clark Fork River in western Montana (USA) has rele ...

Pergamon-Elsevier Science Ltd2013

Metal accumulation and response of antioxidant enzymes in seedlings and adult sunflower mutants with improved metal removal traits on a metal-contaminated soil

Jean-Paul Schwitzguebel, Erika Nehnevajova

Sunflower mutant lines with an enhanced tolerance and metal accumulation capacity obtained by mutation breeding have been proposed for Zn, Cd and Cu removal from metal-contaminated soils in previous studies. However, soils contaminated with trace elements ...

Elsevier2012

Determination of trace metals accumulated and internalized by marine phytoplankton; interferences with colloidal organic matter

In the present work, we study the effects that aggregation of humic acids in seawater, and its adsorption to surfaces, can have on the determination of Cu and Pb accumulation by phytoplankton within the context of metal bioavailability studies, using the d ...

Taylor & Francis Ltd2012

Mercury is a direct and potent γ-secretase inhibitor affecting Notch processing and development in Drosophila

Bruno Lemaitre, Patrick Fraering, Mitko Dimitrov, Takayuki Kuraishi, Isabelle Chang

Prenatal exposure to mercury causes neurodevelopmental disorders and neurological pathologies in infants, such as microcephaly and mental retardation. Despite critical importance, the molecular interactions leading to mercury toxicity are yet to be elucida ...

2011

TEM investigation on zirconate formation and chromium poisoning in LSM/YSZ cathode

Jan Van Herle, Aïcha Hessler-Wyser, Antonin Faes, Josef Andreas Schuler, Zacharie Wuillemin

Cell durability is a crucial technological issue for SOFC commercialization, and considerable progress has been made in recent years. A number of degradation pathways have been established, amongst which microstructural changes, poisoning effects and forma ...

Springer Verlag2011

Sulfur as pollutant species on the cathode side of a SOFC system

Jan Van Herle, Aïcha Hessler-Wyser, Josef Andreas Schuler

Sulfur poisoning in a strontium doped lanthanum cobaltite (LSC) cathode current collection layer was revealed in a solid oxide fuel cell (SOFC) tested in repeat-element and stack configuration. Sources of sulfur contamination, other than trace SOx in air, ...

2009

Toxic metal interactions with soil bacterium "Cupriavidus metallidurans" : the role of chemical speciation and competition

Rita Hajdu Schenk

Living bacteria offer an ecological and cost-effective alternative to the classical physical and chemical techniques for the treatment of environmental contaminations. Although their increasing use in toxic metal removal, systematic studies on the influenc ...

EPFL2009

Dualities in plant tolerance to pollutants and their uptake and translocation to the upper plant parts

Jean-Paul Schwitzguebel

There is a duality in plant tolerance to pollutants and its response to the pollutants’ stress. On the one hand some plants, (hyper)tolerant to heavy metals, are able to hyperaccumulate these metals in shoots, which could be beneficial for phytoremediation ...

2009

Development of a hyphenated analytical methodology for the fractionation and characterization of environmental colloids

Enrica Alasonati

Natural colloids are defined as macromolecules and nanoparticles with sizes ranging between 1 nm and 1 µm. Colloidal pool is complex "ill-defined" mixture of humic substances, exopolymeric substances (EPS), inorganic oxides, clays, etc. Aquatic colloids ha ...

EPFL2009

Increased tolerance of sunflower mutant seedlings to Cd and Zn in hydroponic culture

Jean-Paul Schwitzguebel, Erika Nehnevajova

Cadmium and zinc show similarities in their chemistry, geochemistry and environmental properties. Whereas Cd is a phytotoxic non-essential element, Zn is an essential trace element for plant growth and development. Zinc plays a fundamental role in several ...

2009

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The role of nanominerals and mineral nanoparticles in the transport of toxic trace metals: Field-flow fractionation and analytical TEM analyses after nanoparticle isolation and density separation

Pergamon-Elsevier Science Ltd2013

Metal accumulation and response of antioxidant enzymes in seedlings and adult sunflower mutants with improved metal removal traits on a metal-contaminated soil

Jean-Paul Schwitzguebel, Erika Nehnevajova

Elsevier2012

Determination of trace metals accumulated and internalized by marine phytoplankton; interferences with colloidal organic matter

Taylor & Francis Ltd2012

Toxic metal interactions with soil bacterium "Cupriavidus metallidurans" : the role of chemical speciation and competition

Rita Hajdu Schenk

EPFL2009