Abstract: The invention generally relates to detecting an analyte in a medium. In certain aspects, the invention provides systems and methods for detecting an analyte in a medium comprising one or more light-emitting diodes, each operating at a single wavelength in a deep ultraviolet (UV) range for excitation of a target in a medium and a plurality of semiconductor photodetectors. The system is onfigured such that each semiconductor photodetector detects only a subset of emission from the excited analyte in the medium. In some examples, systems and methods of the invention comprise a light-emitting diode and a semiconductor photodetector for detection of the absence or presence of a non-specific contaminant.

Abstract: The invention generally relates to detecting an analyte in a medium. In certain aspects, the invention provides systems and methods for detecting an analyte in a medium comprising one or more light-emitting diodes, each operating at a single wavelength in a deep ultraviolet (UV) range for excitation of a target in a medium and a plurality of semiconductor photodetectors. The system is configured such that each semiconductor photodetector detects only a subset of emission from the excited analyte in the medium. In some examples, systems and methods of the invention comprise a light-emitting diode and a semiconductor photodetector for detection of the absence or presence of a non-specific contaminant.

Abstract: The invention generally relates to detecting biological substances. In certain aspects, the invention is directed to a method directing one or more wavelengths of light within a deep ultraviolet (UV) spectrum into a medium to excite a biological substance in the medium, detect emission from the excited biological substance via a plurality of semiconductor photodetectors, and analyze the deep UV emission data for presence of a deep UV spectral signature indicative of the biological substance, wherein presence of the deep UV spectral signature indicates that the medium comprises a biological substance. The invention is also directed to identifying a pathogen in a medium comprising a pathogen and a non-pathogen biological substance.

Abstract: A load control circuit having an input terminal adapted to receive any one of a number of different input voltage signals including signals of at least first and second type. These signals may be, respectively, DC and AC input signals. Control circuits are provided for operation of the load from the input voltage signal. This control circuit includes at least first part responsive only to said input voltage signal being of first type for coupling said signal of first type to the load, and a second part responsive only to the input voltage signal being of second type for coupling the signal of second type to the load.