The cells embedded in agarose can be kept viable and treated by incubating the slides in an appropriate medium containing the chemical to be tested for genotoxicity at the desired concentration. The radiation effect on DNA breakage and DNA repair can also be studied in embedded cells by irradiating the slides. The advantage of this procedure is that the cells can be lysed immediately after treatment and run through the comet assay, avoiding further manipulation (trypsinization, centrifugation).
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.