Phase and amplitude of spontaneous retinal vein pulsations: An extended constant inflow and variable outflow model.

The constant inflow and variable outflow (CIVO) theory correctly predicts that spontaneous pulsation of the retinal veins will be visible close to the point where the vein exits the eye at the lamina cribrosa but will decrease rapidly in amplitude and become too small to see only a short distance upstream. However, the phase of vein oscillation relative to the oscillation of the intraocular pressure (IOP) predicted by CIVO has been unclear and controversial. We show that the CIVO model is indeterminate in predicting such phase relations.

Ising model of polarity formation in molecular crystals: from the growth model to the asymptotic equilibrium state.

We analyze a layer-by-layer growth model of crystals consisting of dipolar molecules with two directional states. The model is characterized by the assumption of thermal equilibrium formation of new adlayers, whereas previous layers are treated as being "frozen" in the state in which they were formed. Longitudinal and transverse Ising-type nearest neighbor interactions are taken into account.

Temporal backward projection of optoacoustic pressure transients using fourier transform methods.

In medical imaging different techniques have been developed to gain information from inside a tissue. Optoacoustics is a method to generate tomography pictures of tissue using Q-switched laser pulses. Due to thermal and pressure confinement, a short light pulse generates a pressure distribution inside tissue, which mirrors absorbing structures and can be measured outside the tissue.

Colloidal Particles at Solid-Liquid Interfaces: Mechanisms of Desorption Kinetics.

We study the sorption of colloids on equally charged surfaces. Our focus is on the time scale from hours to weeks, where adsorption is not an irreversible process but interplays with (spontaneous) desorption. Using model calculations, we show how the desorption kinetics is influenced by readsorption, a potential barrier, a secondary potential minimum, local variation of the potential, and bond aging.

Protrusive activity quantitatively determines the rate and direction of cell locomotion.

Locomoting blebbing cells have been used as a model to obtain novel insight into the mechanisms of cell locomotion. We tested the hypothesis that locomotion can be due to progressive one-sided protrusion of cellular volume into pseudopods. The hypothesis is supported by the finding that the rate and direction of locomotion of individual Walker carcinosarcoma cells can be predicted by sequential measurement of protrusive activity.