91 research outputs found
Preparation of iron molybdate catalysts for methanol to formaldehyde oxidation based on ammonium molybdoferrate(II) precursor
It was demonstrated that iron molybdate catalysts for methanol oxidation can be prepared
using Fe(II) as a precursor instead of Fe(III). This would allow for reduction of acidity of
preparation solutions as well as elimination of Fe(III) oxide impurities which are detrimental for
the process selectivity. The system containing Fe(II) and Mo(VI) species in aqueous solution was
investigated using UV–Vis spectroscopy. It was demonstrated that three types of chemical reactions
occur in the Fe(II)–Mo(VI) system: (i) formation of complexes between Fe(II) and molybdate(VI)
ions, (ii) inner sphere oxidation of coordinated Fe(II) by Mo(VI) and (iii) decomposition of the
Fe–Mo complexes to form scarcely soluble Fe(III) molybdate, Mo(VI) hydrous trioxide and
molybdenum blue. Solid molybdoferrate(II) prepared by interaction of Fe(II) and Mo(VI) in
solution was characterized by EDXA, TGA, DTA and XRD and a scheme of its thermal evolution
proposed. The iron molybdate catalyst prepared from Fe(II) precursor was tested in methanol-toformaldehyde
oxidation in a continuous flow fixed-bed reactor to show similar activity and
selectivity to the conventional catalyst prepared with the use of Fe(III)
Highlights of the São Paulo ISEV workshop on extracellular vesicles in cross-kingdom communication
In the past years, extracellular vesicles (EVs) have become an important field of research since EVs have been found to play a central role in biological processes. In pathogens, EVs are involved in several events during the host–pathogen interaction, including invasion, immunomodulation, and pathology as well as parasite–parasite communication. In this report, we summarised the role of EVs in infections caused by viruses, bacteria, fungi, protozoa, and helminths based on the talks and discussions carried out during the International Society for Extracellular Vesicles (ISEV) workshop held in São Paulo (November, 2016), Brazil, entitled Cross-organism Communication by Extracellular Vesicles: Hosts, Microbes and Parasites. © 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.11Ysciescopu
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