Abstract: Gas chromatographs of the invention generally comprise four or more analysis channels. Specifically, four or more gas chromatography columns are configured for parallel analysis of four or more gaseous samples with detection being effected using a microdetector array comprising four or more microdetectors. In one embodiment, the four or more microdetectors 510 are microfabricated detectors, and are integrally formed with a substrate or with one or more microchip bodies mounted on a substrate. In a preferred embodiment, a microdetector array comprises four or more thermal conductivity detectors having one or more thin-film detection filaments. A preferred heated environment for highly parallel gas chromatographs is also disclosed.

Abstract: An electro-optical system intended for medical use that measures and analyses an individual's cumulative short-wave and long-wave UV-radiation exposure as detected by sensor 10 of the system attached to the individual. Sensor 10 separately registers sequences of UV-A and UV-B signals which are synchronized in time by clock pulses. After a predetermined interval sensor 10 is connected to an analyzer unit 12 that statistically processes the collected data to derive risk factor and generate predictive information. Such information permits the physician to predict individual-specific levels of ultraviolet (UV) radiation potentially harmful to the skin and help protect the individual from skin cancer and similar diseases with solar radiation causation.