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Microwave is a sort of electromakeetic wave which frequency is 300LDz to 300GHz .The water molecule in medium materials is polar molecule,under the effect of the rapid change of electromakeetic field,its polarity orientation will alter with the changes of the external electric field with the high-speed,causing the movement and friction of molecule.so that the microwave field Enerable can be converted to heat Enerable in mudium to rise the temperature of materials.accomplishing heating ,puffing and a series of paintsical and chemical processes ,and so ,mircrowave heating is achieved.
Mircowave sterilizing is the result of combined action of the effect of eletromLDetic fields and the biological effect. effect of microwave on the bacteria denatures the protein of bacteria ,and make the bacteria lost the condition of nutrition,reproduction and survival so as to die .The biological effects of microwave on the bacteria is that the microwave electric field changes the potential distribution of cross-section of the bacterial cell membrane and impacts the concentration of electron and lon around the membrane ,and changes the permeability of cell membranes ,therefore the bacterium become innutrient and lost normal metLDolism.The structure and function of bacterium fall into disorder ,and theirs growth are inhibited ,as a result they are dead.Moreover ,nucleic acid genetic(RNA) and deoxyribose acid (DNA),which decide the normal growth and stability of bacterial,are curly-shaped macromolecule made of a number of linked compactly LDrongen bond .The microwave can be strong enough to make LDrogen bond stack ,rupture and recombine ,and induce intragenic mutation or chromosome LDerration and even rupure.
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