At various times after 10 minutes UV irradiation cells were collected for colony forming units and cell cycle measurements (0, 30, 60, 120, 240, 300, 360, and 420 min).The dose level for the UV radiation was 175 J/m². Exposure to UV (10 min) and magnetic field began simultaneously, and magnetic field exposure was continued to the end of experiment (up to 430 min).
The data on cell cycle kinetics suggest different delay times in (UV + magnetic field) exposed yeast cells compared with only UV exposed yeast cells during the first cell cycle. The effect of magnetic field on cell cycle kinetics was seen only at one time point (at 60 min after UV irradiation).
The effect of the magnetic field exposure on the colony forming ability of the UV irradiated yeast cells was statistically significant 420 min after UV irradiation (fewer colony forming units). Moreover, at other time points after UV irradiation, there were fewer colony forming units in "UV+magnetic field" exposed populations than in only UV exposed yeast cells, although the differences were not statistically significant.
These findings could indicate that magnetic field exposure in conjunction with UV may have some effects on yeast cell survival or growth.