Rojavin M A, Ziskin M C
Center for Biomedical Physics, Temple University School of Medicine, Philadelphia, Pennsylvania 19140, USA.
Bioelectromagnetics. 1995;16(3):188-96. doi: 10.1002/bem.2250160307.
Bacterial cells of the strain Escherichia coli K12 were exposed to millimeter electromagnetic waves (mm waves) with and without additional exposure to ultraviolet light lambda = 254 nm (UVC). The mm waves were produced by a medical microwave generator emitting a 4-GHz-wide band around a 61 GHz center frequency and delivering an irradiation of 1 mW/cm2 and a standard absorption rate (SAR) of 84 W/kg to the bacteria. Exposure to the mm waves alone for up to 39 minutes did not change the survival rate of bacteria. Exposure to mm waves followed by UVC irradiation also did not alter the number of surviving E. coli cells in comparison to UVC-treated controls. When mm waves were applied after the UVC exposure, a dose-dependent increase of up to 30% in the survival of E. coli was observed compared to UVC + sham-irradiated bacteria. Because sham controls and experimental samples were maintained under the same thermal conditions, the effect is not likely to be due to heating, although the possibility of nonuniform distribution of microwave heating in different layers of irradiated bacterial suspension cannot be ruled out. The mechanism for this effect appears to involve certain DNA repair systems that act as cellular targets for mm waves.
将大肠杆菌K12菌株的细菌细胞暴露于毫米波（mm波），并分别进行或不进行额外的254nm紫外线（UVC）照射。毫米波由医用微波发生器产生，该发生器在61GHz中心频率周围发射4GHz宽带，向细菌提供1mW/cm2的辐照度和84W/kg的标准吸收率（SAR）。单独暴露于毫米波长达39分钟不会改变细菌的存活率。与UVC处理的对照相比，先暴露于毫米波再进行UVC照射也不会改变存活的大肠杆菌细胞数量。当在UVC暴露后施加毫米波时，与UVC+假照射的细菌相比，观察到大肠杆菌存活率剂量依赖性增加高达30%。由于假对照和实验样品在相同的热条件下保存，尽管不能排除微波加热在辐照细菌悬液不同层中分布不均匀的可能性，但这种效应不太可能是由于加热引起的。这种效应的机制似乎涉及某些作为毫米波细胞靶点的DNA修复系统。
