Surface studies of nano-dimensional particle size iron-manganese spinel mixed oxides

Article Abstract:

Morphology and structure of high-dispersity iron-manganese binary spinel oxides have been studied and the relationships among oxidation reactivity, metal cation oxidation states, and surface composition for them explored. Monophase binary iron-manganese spinel oxides that have high dispersity were made using thermal decomposition at 570-770 K of carbonate precursors with Fe/Mn greater than or equal to 0.33 and less than or equal to 2. Interparticle meso- ad macropores contribute to the surface morphology of the spinel oxides. They are made up of spherical particles with 7-12 nm diameters.

Manganese, Manganese (Metal), Ferrites (Magnetic materials), Spinel

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On the role of copper and iron in DNA cleavage by ochratoxin A: structure-activity relationships in metal binding and copper-mediated DNA cleavage

Article Abstract:

The roles of copper and iron in DNA cleavage by ochratoxin A (OTA) have been studied. The object was to find out whether redox-active transition metals bring on OTA-mediated damage to DNA. Structure-activity relationships in copper-mediated DNA cleavage and in metal binding were investigated. Ochratoxin A, a fungal carcinogen, is helpful in single-strand DNA cleavage and adduction when it is activated metabolically. The toxin's ability to bind Cu(II) and Fe(III) was studied. No role could be found for OTA in Fe-induced DNA strand scission.

DNA damage, Structure-activity relationships (Biochemistry), Copper, Carcinogens, Fungi, Pathogenic, Pathogenic fungi

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Cleavage of neutral alkenes and alkene radical cations; hybrid Hartree-Fock/density functional theory results

Article Abstract:

Cleavage reactions of 1-butene and 4,4-dimethyl-1-pentene molecules and their cations, formation of neutral/charged hydrocarbon products have been studied. Hybrid Hartree-Fock/density functional theory results have been reviewed. Experimental properties of the hyperfine sort of the 1-butene cation can be explained by rotational averaging. It is caused by the flat potential surface for rotation about the C2-C3 bond.

Canada, Sweden, Usage, Cations, Density functionals, Density functional theory, Scission (Chemistry), Olefins, Alkenes

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