Synthesis and photothermal performance of non-stoichiometric molybdenum oxide (MoO3-x) prepared by gamma radiation.

This work reports the interaction of γ-rays with MoO3 in several solvents to obtain non-stoichiometric (sub-oxide) MoO3-x through a one-pot synthesis. The effect of different doses of γ-radiation (30-90 kGy) with different protic solvents (water, N,N-dimethylformamide and formic acid) was investigated. Structural modifications were characterized by X-ray diffractometry and scanning electron microscopy while optical properties were investigated by UV-Vis spectroscopy. The analysis of the highly intense (020), (040) and (060) diffraction peaks suggests that there is a reduction in water and formic acid allowing the formation of MoO3-x nanosheets. Additionally, the photothermal response of MoO3-x obtained under different conditions was characterized, and a possible mechanism to explain the interaction of γ-rays with solvents and the oxide structure by oxidative/reductive processes in the solution was proposed.

Polyvinyl alcohol-glutaraldehyde as solid-phase in ELISA for schistosomiasis

Preparaçöes antigenicas soluveis de Schistosoma mansoni adulto (SWAP) fixadas covalentemente em discos de polivinil alcool-glutaraldeido foram usadas em teste de ELISA. As melhores condiçöes para o ensaio foram estabelecidas e foi encontrado que uma quantidade mínima de antigeno, em torno de 1,5 ug e necessária. Comparaçäo entre este procedimento e o de ELISA convencional foi estabelecida. Um metodo seguro de imobilizaçäo do antigeno foi alcançado e os baixos preços dos reagentes empregados säo economicamente atraentes...