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Non-Thermal Millimeter Waves Non-Ionizing Radiation of Saccharomyces Cerevisiae – Insights and Interactions

Nonionizing millimeter-waves (MMW) interact with cells in a variety of ways. Here the inhibited cell division effect was investigated using 85-105 GHz MMW irradiation within the ICNIRP (International Commission on Non-Ionizing Radiation Protection) non-thermal 20 mW/cm2 safety standards. We irradiated using radiation with a power density of about 1.0 mW/cm2 over 5-6 hours on 50 cells/μl samples of Saccharomyces cerevisiae model organism. This resulted in 62% growth rate reduction compared to the control (sham). The effect was specific for 85-105 GHz range, and was energy and cell density dependent. Irradiation of wild type and Δrad52 (DNA damage repair gene) deleted cells presented no differences of colony growth profiles indicating non-thermal MMW treatment does not cause permanent genetic alterations. Dose versus response relations studied using a standard horn antenna (~1.0 mW/cm2) and compared to that of a compact waveguide (17.17 mW/cm2) for increased power delivery resulted in complete termination of cell division via non-thermal processes supported by temperature rise measurements. Combinations of MMW mediated Structure Resonant Energy Transfer (SRET), membrane modulations eliciting signaling effects, and energetic resonance with biomolecules are conjectured to be responsible for the observations reported. Our results suggest innovative applications of nonionizing radiation procedures for yeast related diseases and other targeted biomedical outcomes.