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Estimando o threshold de detecção para defeitos da bebida de café.

2006

Self-Aggregation of Lipophilic Porphyrins in Reverse Micelles of Aerosol OT

The aggregation process of meso-tetra(4-aminosulfonylphenyl)porphyrin (PC0), of butyl and dodecyl derivatives (PC4 and PC12, respectively) in the presence of aerosol-OT (AOT) reversed micelles with different values of ω0 = [water]/[AOT] was investigated using steady-state extinction, fluorescence, and resonance light scattering (RLS) techniques. The scattering has been accounted for and the absorption spectra c...

New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen S...

Halogenated phenylbacteriochlorins are synthesized with high yields in a two-step procedure. They have strong absorbances in the red and are very stable to air and light at room temperature. Flash photolysis measurements show that the triplet states of these bacteriochlorins have 30 μs lifetimes in deaerated toluene, that are quenched with diffusion-controlled rate constants by molecular oxygen. Time-resolved p...

Stability studies of a recombinant cutinase immobilized to dextran and derivati...

Recombinant cutinase from Fusarium solani pisi was covalently attached to dextran and two derivatized silica supports, Biosil-NH2 and Biosil-Dextran-NH2. Kinetic parameters were determined for all three systems as well as for soluble cutinase. Long-term stability in aqueous media was studied; dextran may have a stabilizing role not only due to the covalent links involved but also in the same way as other polyhy...

Recent advances in the development of DNA hybridization probes for the detectio...

Are our laboratory "strains" representative samples of Trypanosoma cruzi popula...