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Surgery for Chronic otitis media with cholesteatoma: 10-year review

Abstract Introduction: Optimal surgical management for Chronic otitis media with cholesteatoma is controversial. Decisions regarding surgical approaches are still highly debated today. Analysing and comparing our experience may help us to expand our common knowledge and predict further outcomes facilitating the discussion and choice of treatment options. Objectives and methodology: The authors conducted a retro...

On the use of capsaicin as a natural preservative against fungal attack on Pinu...

Capsaicin (capsicum oleoresin) extracted from two peeper species, Capsicum frutescens and Capsicum baccatum, was investigated as a natural preservative against fungal (Paecilomyces variotti) attack on Pinus sp. and Hymenaea sp. Static contact angle measurements were performed as a function of time in order to investigate the wetting properties of the wood samples treated with capsicum oleoresin. As revealed by ...

Electrosynthesis and optical characterization of poly(p-phenylene), polypyrrole...

Poly(p-phenylene) (PPP), polypyrrole (PPY), and poly(p-phenylene-pyrrole) (PPP-PPY) films were electrochemically synthesized in acetronitrile by cyclic voltammetry. For comparison purposes, the films were characterized by cyclic voltammetry in a monomer-free solution, and their optical responses were also obtained in the UV-VIS range of energy after varying the applied potentials. The absorbance spectra of the ...

Wettability, Shrinkage and Color Changes of Araucaria angustifolia After Heatin...

The effects of thermal treatment on the wettability and shrink resistance of Araucaria angustifolia (Parana pine) were studied from 20 to 200 °C. The contact angles of water droplets on untreated and heat-treated samples were measured by the sessile drop method in the grain of heartwood and sapwood cut in the radial, longitudinal, and tangential directions. A significant increase of the contact angles was verif...

Synthesis and characterization of poly-o-toluidine: kinetic and structural aspects

Poly(o-methylaniline) (poly-o-toluidine, PTOL) was synthesized by chemical oxidation of o-toluidine with ammonium peroxydisulfate in an aqueous 1.0 mol L-1 HCl solution. The progress of polymerization was followed by measuring the open-circuit potential (OCP) of a Pt electrode immersed in the reaction medium with the polymerization time. The chemical synthesis of PTOL was carried out at different monomer:oxidan...

Fundamentals and applications of spectroscopic ellipsometry

This paper describes the use of ellipsometry as a precise and accurate technique for characterizing substrates and overlayers. A brief historical development of ellipsometry and the basic principles necessary to understand how an ellipsometer works are presented. There are many examples of studies performed in addressing materials science issues, and several are presented here: measurements of thickness, optica...

Fundamentals and applications of spectroscopic ellipsometry

Síntese e caracterização de poliuretanos segmentados contendo blocos de peso mo...

Poliuretanos segmentados formados por segmentos flexíveis e rígidos bem caracterizados foram sintetizados através de uma nova metodologia de síntese, em que cada segmento foi preparado separadamente, e ambos acoplados em uma etapa posterior (produtos SPU). Uma outra série de poliuretanos segmentados similares em composição foi obtida pelo método tradicional em duas etapas (produtos PU). As propriedades térmicas...