Fruit-Enhanced Resistance to Microbial Infection Induced by Selective Laser Excitation

Figure 3

(a) and (b) average colony forming units per gram (CFU/g) expressed in bars diagram (a), and cheese percentage (b) for (R), (NR), and (C) samples, as indicated. Error bars denote the standard deviation. Notice that while the nonresonant sample already developed lower CFU/g compared to the control sample, further reduction in the CFU/g is clearly observed in the resonant sample when compared to that of nonresonant one. (c) Typical pictures of individual Petri plates after incubation in potato dextrose agar at 37°C for 48 h. (C), (B), and (A) pictures correspond to control, nonresonant, and resonantly irradiated grapes, respectively. Notice how the resonant sample shows a significantly lower number (just a very few) of CFU/g in comparison with control and nonresonant samples. See text for comments.