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Publicatii proprii
Interface-induced room-temperature multiferroicity in BaTiO3
Multiferroic materials possess two or more ferroic orders but have not been exploited in devices owing to the scarcity of room-temperature examples. Those that are ferromagnetic and ferroelectric have potential applications in multi-state data storage if the ferroic orders switch independently, or in electric-field controlled spintronics if the magnetoelectric coupling is strong. Future applications could also exploit toroidal moments and optical
Read moreAzulen-1-yl Diazenes Substituted at C-3 with Phenyl-Chalcogene Moieties: Dye Synthesis, Product Characterization and Properties
Two synthesis strategies were used for the generation of azulene-1-yl diazenes substituted at C-3 with a phenyl-chalcogenyl moiety, the synthesis of azulenes substituted at C-3 followed by azo-coupling and azulene substitution at C-3 in azulene-azo dyes. The last synthetic route seems to give more satisfactory results for the synthesis of the desired chalcogenic derivatives. Another target of this study was to investigate the changes induced by the
Read moreA conceptual framework for up-scaling ecological processes and application to ectomycorrhizal fungi
After reviewing the limits of the current approaches, we introduce an analytical framework for up-scaling analyses of ecological processes. The framework attempts to produce a conceptual unification and lead to a ten step approach for up-scaling from a source to a target scale. The literature on ectomycorrhizal fungi is then screened following each up-scaling step. We conclude that one needs to construct four hierarchical levels in order to understand
Read moreHyperaccumulation: a Key to Heavy Metal Bioremediation
As environmental issues become more and more stringent, the biotechnological approaches to maintain clean environments are receiving increasing attention. Heavy metal pollution is of great concern as it ultimately forces heavy metals into the food chain leading to serious ecological and health problems. Removal of excess heavy metals from contaminated sites could be achieved by means of organisms that bioaccumulate heavy metals without developing
Read moreThe Role of Mineralogy and Geochemistry in Hazard Potential Assessment of Mining Areas
The concept of hazard in the current interpretation of the European and national regulations is directed to local and short term effects and its assessment is based on the distribution in space of the concentration of contaminants in abiotic and biotic compartments. We expand this concept and address its limitations by describing potential hazard with full space-time dimension, i.e. from short term to long term, and from local to regional. This most
Read moreThe Role of Organic Matter in the Mobility of Metals in Contaminated Sites
We have applied a concept framework for scale specific processes in order to characterize the role of the organic matter in the mobility of metals. At very small scale we identified roles by immobilization of metals (immobilization in litter, immobilization in soil aggregates, dissolved organic carbon chelates in fine pores), by mobilization of metals (organochemical weathering, soluble chelates, organocolloids, free enzymatic degradation of immobile
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