too one has developed a method and bioanalysis apparatus for quickly detect and measure the toxic response of bacteria to chemicals whose rates are low to produce acute toxic symptoms, but that would cause a reaction or deterioration toxic years after chronic exposure. The bacteria used are isogenic strains of Bacillus subtilis subjected to chemical exposure and illuminated by radiation such as a laser beam. Sensors detect the differential light scattered by the bacteria, and calculates the response index of cytotoxicity and genotoxicity.
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