The effects of aspirin and ibuprofen on pepsinogen secretion were studied in isolated human peptic cells prepared from endoscopically obtained biopsy specimens after collagenase digestion, mechanical disruption, and percoll gradient centrifugation. Pharmacological concentrations of aspirin and ibuprofen (10(-8)-10(-4) M), potentiated histamine (10(-6)-10(-4)M) and forskolin (10(-5)M) stimulated...

 Transient Current Characteristics of Dispersed Charges in a Non-Polar Medium Yoocharn Jeon, Pavel Kornilovitch, Patricia Beck, Zhang-Lin Zhou, Richard Henze, Tim Koch HP Laboratories HPL-2011-51 electrophoretic displays, charge, non-polar medium, transient currents, modeling Transient currents of reverse micelles in a non-polar solvent from voltage step stimuli were studied to investigate the...

Food-grade microemulsions containing oleic acid, ethanol, Tween 20, and water were formulated as a carrier system for tea seed oil (Camellia oleifera Abel.). The effect of ethanol on the phase behavior of the microemulsion system was clearly reflected in pseudo-ternary diagrams. The solubilization capacity and solubilization efficiency of tea seed oil dispersions were measured along the dilutio...

A population balance model is considered for the description of mass transfer in liquidliquid dispersions in a mechanically agitated vessel operated continuously. The dispersions considered are of low dispersed phase fraction in which coalescence processes may be assumed to be negligible. The model incorporates the dynamic nature of breakage processes among the droplet population together with ...

We present an experimental study of a new regime of monodisperse micro–droplet generation that we named the balloon regime. A dispersion of oil in water in a T–junction microfluidic system was studied. Several microfluidic devices having different cross– sections of the continuous and the dispersed phases micro–channels were tested. This new regime appears only for low dispersed phase velocity....

Conventional modeling of two-phase dilute suspensions is achieved with the Euler equations for the gas phase and gas dynamics pressureless equations for the dispersed phase, the two systems being coupled by various relaxation terms. The gas phase equations form a hyperbolic system but the particle phase corresponds to a hyperbolic degenerated one. Numerical difficulties are thus present when de...

Microfluidic droplet formation at a T-junction in the jetting regime was studied theoretically and an analytical force balance model was proposed to predict the diameter of droplets. The forces governing droplet production in the jetting regime include the shear, interfacial tension, linear momentum and inertial forces. Experiments were carried with non-Newtonian xanthan gum solutions as the di...