KRIEBEL, MAHLoN E. Wave front analyses of impulses in tunicate hart. Am. J. Physiol. 218(4) : 1194-l 200. 1970.-The U-shaped, tubular hearts of Ciona are composed of a single layer of cells joined by apical tight junctions. Pacemakers at each end alternate in periods of activity, reversing the direction of blood flow. Hearts are attached by a raphe along one edge to the pericardium. Impulses do...

Thermal convection in a lid cooled cavity with phase change was studied experimentally and numerically. The ow and ice front structures, and their dependence on the ow parameters (Rayleigh number) were investigated. In the experiment, the onset of convection in an initially isothermal uid (water) in a 383838mm plexiglas box, which is instantaneously cooled from isothermal top wall to a temperat...

Mechanical properties of biological tissues are of interest for assessing the performance of elastographic methods that evaluate the stiffness characteristics of tissue. The mechanical properties of interest include the frequency-dependent complex moduli, storage and loss moduli of tissues. Determination of the mechanical properties of biological tissues is often limited by proper geometry of t...

We present a fiber-optic sensor for monitoring respiration and heart activity designed to operate in the magnetic resonance imaging (MRI) environment. The sensor employs a Plexiglas springboard, which converts movements of the patient's body lying on the board (i.e., lung- and heart-induced vibrations) to strain, where a fiber Bragg grating attached to the board is used to measure this strain. ...

Ultrasonic measurement techniques for velocity estimation are currently widely used in fluid flow studies and applications. An accurate determination of interfacial position in gas-liquid two-phase flows is still an open problem. The quality of this information directly reflects on the accuracy of void fraction measurement, and it provides a means of discriminating velocity information of both ...

The development of a microfluidic biosensor module with fluorescence detection for the identification of pathogenic organisms and viruses is presented in this article. The microfluidic biosensor consists of a network of microchannels fabricated in polydimethylsiloxane (PDMS) substrate. The microchannels are sealed with a glass substrate and packed in a Plexiglas housing to provide connection to...

Dye effluents with low BOD/COD ratio and varied chemical structures are usually very recalcitrant to microbial degradation. Therefore, different process was used for the treatment of dye effluent. Heterogeneous photocatalyst process has been widely used as leading green technology for dye removal. The process utilizes a semiconductor photocatalyst (such as TiO2 or ZnO) and UV light to oxidize t...

Cyclic light and dark-reared rats were exposed to intense visible light for various periods and then rhodopsin-measured following recovery in darkness for up to 14 days. Animals were injected with ascorbic acid or ascorbate derivatives at various doses prior to light exposure in green Plexiglas chambers. The results show that ascorbic acid administration elevates retinal ascorbate and reduces t...

We tested the hypothesis that environmental stress is a predisposing factor for liver injury by examining the effect of acute restraint on liver injury provoked by carbon tetrachloride (CCl4) and allyl alcohol. Mice were immobilized using Plexiglas restraint cages, producing a form of psychogenic stress, whereas other animals were allowed to roam free. Serum alanine aminotransferase levels were...

Energy dissipation in drops has been investigated by physical models. After determination of effective parameters on the phenomenon, three drops with different heights have been constructed from Plexiglas. They have been installed in two existing flumes in the hydraulic laboratory. Several runs of physical models have been undertaken to measured required parameters for determination of the ener...