Abstract: A safety signalling device is conveniently and clearly positionable upon a person or upon a vehicle upon which a person is riding in order to assure said person of a most highest quality of safety warning in relation to effects of traffic conditions. For example, whether he is walking along a street, or jogging, or riding a bicycle or motorcycle, he may always place the safety device at a position which he considers to be the most clearly visible for any motorized traffic. The multiplicity of light-emitting diodes are extremely visible to said traffic. The choice of colored diodes, such as amber or red, may be made to conform to a particular signal.

Abstract: The present invention is directed to a system and method which measures transcellular parameters in which cells are cultured in a monolayer on a biomaterial. The parameters measured are indicative of in vivo values such as cell-cell and cell-matrix adhesion parameters.

Abstract: Methods for measuring cell membrane property are disclosed. A computer readable medium includes instructions for deriving from transcellular impedance a measurement of a cell membrane property and provides the stability and error of the measurement. The derivation from the transcellular impedance includes the real and imaginary components of the transcellular impedance and also uses a geometric shape to model the shape of the cell. Alternatively, the derivation from the transcellular impedance includes magnitude and complex components. The measurements include the membrane capacitance, membrane resistance, and/or cell adhesion.

Abstract: A wave making method positions a shallow draft vessel off-shore form a shoreline of a sea in a position whereby one side of the vessel is in parallel to the shoreline. A pump is used for pumping seawater into a tank interior to the vessel. When the vessel is filled, the water is lifted to a rim of a side of the tank nearest to the shoreline to thereby dump the water in the tank over a side of the vessel. The dumped water is directed outwardly from the vessel and falls onto a submerged curved platform attached to the vessel and which extends outwardly therefrom. The platform creates a wave that moves away from the one side of the vessel toward the shoreline and is suitable for surfing.

Abstract: A femoral prosthesis comprising a shank, a neck integral with the shank, and a detachable ball head supported on the neck and interchangeable with other ball heads of different external size whereby a common shank and neck can support a ball head of desired external size.