Inert gas influence on the laminar burning velocity of methane-air mixtures.

Flame propagation was studied in methane-air-inert (He, Ar, N or CO) mixtures with various initial pressures and compositions using pressure-time records obtained in a spherical vessel with central ignition. The laminar burning velocities of CH-air and CH-air-inert mixtures obtained from experimental p(t) records of the early stage of combustion were compared with literature data and with those obtained from numerical modeling of 1D flames. The overall reaction orders of methane oxidation were determined from the baric coefficients of the laminar burning velocities determined from power-law equations.

Permanganate-assisted removal of PCR inhibitors during the DNA Chelex extraction from stained denim samples.

In this study, it was demonstrated that the DNA Chelex extraction combined with the permanganate assisted-oxidation is highly efficient in removing the PCR inhibitors often found in clothing materials, such as phthalocyanine. The extraction assays were conducted in saliva, blood and epithelial cells samples mixed with three oxidation-resistant dye copper(II) α-phthalocyanine, copper(II) β-phthalocyanine and tetrasulfonated copper(II) β-phthalocyanine. After DNA amplification, all samples were able to provide full DNA profiles.

Kinetics of hydrogen peroxide decomposition by catalase: hydroxylic solvent effects.

The effect of water-alcohol (methanol, ethanol, propan-1-ol, propan-2-ol, ethane-1,2-diol and propane-1,2,3-triol) binary mixtures on the kinetics of hydrogen peroxide decomposition in the presence of bovine liver catalase is investigated. In all solvents, the activity of catalase is smaller than in water. The results are discussed on the basis of a simple kinetic model.

Temperature and pressure influence on explosion pressures of closed vessel propane-air deflagrations.

An experimental study on pressure evolution during closed vessel explosions of propane-air mixtures was performed, for systems with various initial concentrations and pressures ([C(3)H(8)]=2.50-6.20 vol.

Oxidase-peroxidase reaction: kinetics of peroxidase-catalysed oxidation of 2-aminophenol.

Possible reaction pathways that may lead to horseradish peroxidase inactivation during the aerobic oxidation of 2-aminophenol were investigated using extended kinetic curves. A kinetic model involving the formation of a low-reactive species, Compound III, was proposed and several rate constants were calculated using an optimisation computing program. Sensitivity analysis allowed to conclude that both oxidase and peroxidase cycles occur in 2-aminophenol oxidation.

The rate of pressure rise of gaseous propylene-air explosions in spherical and cylindrical enclosures.

The maximum rates of pressure rise of propylene-air explosions at various initial pressures and various fuel/oxygen ratios in three closed vessels (a spherical vessel with central ignition and two cylindrical vessels with central or with top ignition) are reported. It was found that in explosions of quiescent mixtures the maximum rates of pressure rise are linear functions on total initial pressure, at constant initial temperature and fuel/oxygen ratio. The slope and intercept of found correlations are greatly influenced by vessel's volume and shape and by the position of the ignition source--factors which determine the amount of heat losses from the burned gas in a closed vessel explosion.