CARLSBAD, Calif., Sept. 9 -- JMAR Technologies Inc., a Carlsbad, Calif., maker of laser-based equipment for imaging, analysis and fabrication at the nanoscale, announced it has signed a binding agreement to acquire The LXT Group, which develops optical and electronic systems for real-time detection of microorganisms. The companies formed an alliance last June for the joint development of BioSentry, a laser-based early-warning system to detect microorganisms in water supplies. 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