Objective To study the effects of electromagnetic pulse(EMP) on bone metabolism of mice in vivo.Methods Twenty-four male BALB/c mice were divided into a control group and 2 experimental groups(n=8) .The whole-body of mice in experimental groups were exposed to 50 kV/m and 400kV/m EMP,400 pulses daily for 7 consecutive days at 2 seconds intervals.Alkaline phosphotase(ALP) activity,serum calcium concentration and osteocalcin level and trabecular bone volume(BV/TV,%) were measured immediately after EMP exposure by biochemical,ELISA and morphological methods.Results The ALP activity,serum calcium concentration and osteocalcin level and BV/TV in experimental groups remained unchanged after EMP exposure.Conclusion Under our experimental conditions,EMP exposure cannot affect bone metabolism of mice in vivo.
To observe the effect of electromagnetic pulse(EMP) exposure on cerebral micro vascular permeability in rats.Methods The whole-body of male Sprague-Dawley rats were exposed or sham exposed to 200 pulses or 400 pulses(1 Hz) of EMP at 200 kV/m.At 0.5,1,3,6,and 12 h after EMP exposure,the permeability of cerebral micro vascular was detected by transmission electron microscopy and immunohistochemistry using lanthanum nitrate and endogenous albumin as vascular tracers,respectively.Results The lanthanum nitrate tracer was limited to the micro vascular lumen with no lanthanum nitrate or albumin tracer extravasation in control rat brain.After EMP exposure,the lanthanum nitrate ions reached the tight junction,basal lamina and pericapillary tissue.Similarly,the albumin immunopositive staining was identified in pericapillary tissue.The changes in brain micro vascular permeability were transient,the leakage of micro vascular vessels appeared at 1 h,and reached its peak at 3 h,and nearly recovered at 12 h,after EMP exposure.In addition,the leakage of micro vascular was more obvious after exposure of EMP at 400 pulses than after exposure of EMP at 200 pulses.Conclusion Exposure to 200 and 400 pulses(1 Hz) of EMP at 200 kV/m can increase cerebral micro vascular permeability in rats,which is recoverable.
