ABSTRACT
Background and Aim: Considering the great advances and extensive use of cell phones and its effects on the human communications and interactions, investigation of potential negative effects of cell phones on the users' health is necessary. The aim of this study was to determine the effect of the distance between cell phones and brain tissue on the temperature of the central and gray matters of the brain, because of the heat generated by radiofrequency waves
Methods: This was an experimental study. Cow brain tissue was analyzed in a compartment with three depths of 2 mm, 12 mm and 22 mm, and at the distances of 4 mm and 4 cm from a cell phone, for 15 minutes. Lutron thermometer was used to measure the tissue temperature. Data analysis performed by using Lutron and MATLAB software packages
Results: Temperature increase was more at the distance of 4 mm and in the depths of 2, 12, and 22 mm compared to that at the distance of 4 cm. Also temperature increase after removal of the confrontation was more than the baseline temperature at both distances which was higher at the distance of 4 mm
Conclusion: Decreased distance between brain tissue and cell phone can increase the tissue temperature. Increasing the cell phone distance from the brain tissue can result in slower trend in temperature increase and decreased collective temperature after discontinuing the confrontation
ABSTRACT
Unrestricted somatic stem cells [USSC] are cord blood stem cells that have been considered as candidates for the regulation of immune responses. Therefore, potential exists for their use in the suppression of immune response after transplantation surgery. The aim of this study was evaluation of the effect of USSC on mixed lymphocyte reaction [MLR] as a model for graft rejection. USSC and mesanchymal stem cells [MSC] were isolated and cultured from cord blood and bone morrow, respectively. The immunophenotypes of USSC and MSC were evaluated by flow cytometery and USSC and MSC were cocultured with peripheral blood lymphocytes [PBL] in an MLR to evaluate the immunomodulatory effect of these cells as a percentage of the control response. Current study demonstrated that proliferation of lymphocytes in the MLR was decreased after treatment with USSC, in a similar fashion to that seen with MSC. It can be concluded that USSC have similar regulatory effects as MSC on the MLR, which can be used as an indicator for potential organ rejection after transplantation. Therefore, the immunoregulatory effect of these cells could be used in the clinic during organ transplantation and in the management of autoimmunity