Abstract: A point of sale (POS) terminal including a contactless transaction/identification card reader and a propinquity verifier, coupled to the contactless card reader and verifying at least predetermined propinquity of the POS terminal to a propinquity indication element.

Abstract: A point of sale (POS) terminal including a contactless transaction/identification card reader and a propinquity verifier, coupled to the contactless card reader and verifying at least predetermined propinquity of the POS terminal to a propinquity indication element.

Abstract: A chemiluminescence method for continuously monitoring in real time the generation of oxidative products such as hydrogen peroxide and superoxide from in vitro cell-biomaterial interactions using cell lines such as Human Leukemic cells (HL-60); tumor cell line hybridomas; cells lacking the respiratory burst such as Chronic Granulomatous Disease cells as controls; Monocytic cell lines; Primary Human cells such as monocytes, pmns, fibroblasts, endothelial cells; and whole and isolated blood cells. The oxidative products have the potential for the degradation of the biomaterial and thus this information can be used to aid in predicting the functional lifetime of the biomaterial when it is used to fabricate an implanted medical device. Further, this method may be used to determine the amount of activation of biological cells which is inferred from the amount of oxidative products.

Abstract: A high efficiency envelope amplifier is disclosed. The invention includes a power supply, a comparator and several switches. The power supply is capable of providing multiple outputs. The comparator measures the amplitude of an input signal against one of several threshold levels. When the input signal is within a predetermined range, a selected power supply output is switched incrementally switches small amounts of power, switching losses are substantially mitigated.

Abstract: The present invention discloses a device and a process for quantitation of Toxoplasma gondii and Treponema pallidum antibody titer in a biological sample by immunofluorescent photometric microscopy.

Abstract: The present invention discloses a device and a process for quantitation of end point in the formation of fluorescent reaction product in microfluorophotometry. The process comprises:(a) incorporating a protective agent in a suitable mounting medium in an amount sufficient to reduce fading of fluorescent reaction product less than 25% of initial fluorescent intensity;(b) calibrating photometer used in said microscopy with a stable emitter; and(c) recording the intensity of fluorescence of said fluorescent reaction product by means for measuring light intensity.The invention also includes a device for calibration of the photometer and a kit comprising separate containers for suitable mounting medium, buffer, suitable immunofluorescent reagents, fading retardant means, a photometer calibrating device and the like and optional instructions.