A novel sensor principle for continuous monitoring of biofilms is presented. A small heater generates a steady sinusoidal heat signal. The resulting temperature oscillations are measured through a temperature sensor. The amplitude and phase shift of the oscillations are used as sensing parameters. The sensor system successfully detects surface attached bacterial growth within 30 minutes of inoc...

For many infectious diseases, immunity wanes over time. The majority of SIRS models assume that this loss of immunity takes place at a constant rate. We study temporary immunity within a SIRS model structure if the rate of loss of immunity can depend on the time since recovery from disease. We determine the conditions under which the endemic steady state becomes unstable and periodic oscillatio...

The properties of inositol 1,4,5-trisphosphate (IP3)-dependent intracellular calcium oscillations in pancreatic acinar cells depend crucially on the agonist used to stimulate them. Acetylcholine or carbachol (CCh) cause high-frequency (10-12-s period) calcium oscillations that are superimposed on a raised baseline, while cholecystokinin (CCK) causes long-period (>100-s period) baseline spiking....

We report an experimental study of ultra-high-frequency chaotic dynamics generated in a delaydynamical electronic device. It consists of a transistor-based nonlinearity, commercially-available amplifiers, and a transmission-line for feedback. The feedback is band-limited, allowing tuning of the characteristic time-scales of both the periodic and high-dimensional chaotic oscillations that can be...

We show that a simple model of a spatially resolved evolving economic system, which has a steady state under simultaneous updating, shows stable oscillations in price when updated asynchronously. The oscillations arise from a gradual decline of the mean price due to competition among sellers competing for the same resource. This lowers profitability and hence population but is followed by a sha...

Although a deviation from the physiologically optimal weight increases the probability of dying, the steady state for an expected lifetime-utility maximiser is a state of overweightness. However, even a small initial deviation from this rationally stationary weight is followed by explosive oscillations. These oscillations might lead to severe and chronic underweightness in a late stage of life....

The role of asymmetries (large-scde horizontal eddies) in satisfying the mean angular momentum budget for the steady-state hurricane is studied by computing transverse circulations for a prescribed tangential vortex on the scale of 1000 km. For realistic diabatic heating rates at large distances from the hurricane center, the correlation between radial velocity and absolute vorticity must be ne...

Dysfunctional neural circuitry has been found to be involved in abnormalities of perception and cognition in patients with schizophrenia. Gamma oscillations are essential for integrating information within neural circuits and have therefore been associated with many perceptual and cognitive processes in healthy human subjects and animals. This review presents an overview of the neural basis of ...

Particle image velocimetry is applied to the lid-driven flow in a cube to validate the numerical prediction of steady-oscillatory transition at lower than ever observed Reynolds number. Experimental results agree with the numerical simulation demonstrating large amplitude oscillatory motion overlaying the base quasi-two-dimensional flow in the mid-plane. A good agreement in the values of critic...