A method and apparatus for performing melting curve analyses of nucleic acids on a microarray is described. The present method includes varying the temperature of a fluid on a microarray to dissociate and remove target DNA, scanning the mircoarray for fluorescence, collecting the target DNA removed from the microarray, and reusing the collected target DNA and the microarray. The apparatus of the present disclosure includes a microarray stage, a light source and detector, and a temperature controller, wherein the temperature controller is configured to adjust the temperature of a fluid within a sample chamber on the microarray such that the temperature of the fluid is varied during the analysis such that target DNA is dissociated from the microarray, and wherein the light source is directed to the microarray and the resulting fluorescence is perceived by the detector.