background: ramsar (mazandran province) is known for its extremely high levels of natural background radiation. although no excess cancer rate is reported in these areas by epidemiological studies, the study of tumor markers in the inhabitants of these areas may shed some light on the impact of high levels of background radiation on cancer induction. materials and methods: the level of backgrou...

introduction radioactive materials naturally exist in the world. indeed, approximately 82% of human-absorbed radiation doses, which are out of human control, arise from natural sources of radiation including cosmic, terrestrial, and exposure through inhalation or ingestion. thus, the aim of the present study was to estimate health risk, as well as the effective and organ doses from naturally oc...

Background: Although ionizing radiation is a risk factor, it is a therapeutic agent for cancer. Objectives: The protective and defensive effect of L-Carnitine and vitamin E on gastrointestinal tract organs (liver, spleen and intestine) post whole body gamma irradiation exposure. Material and methods: 56 male albino rats, which were divided into four groups (14 rats per group); group (I): Contro...

Low-dose (</= 0.1 Gy) radiation could reduce high-dose induced damage including tumorigenesis. However, it remains unclear whether multi-exposure to low-dose radiation at a high dose rate has any risk for increasing tumorigenesis, and whether Fhit plays any role in the process. The purpose of this study is to investigate the effects of multi-exposure to low-dose radiation at a high dose rate on...

Intestinal microbiota play an important role in our health by immune system modulation, nutrient and xenobiotic metabolism, and sensitivity to radiation-induced injury. The individual susceptibility of humans to radiation is poorly understood and its determination accomplished by large uncertainties in radiation exposure (and radiation risk estimation) which include radiation-quality, dose-rate...

Background: Over the past few years, the rapid use of high frequency electromagnetic fields like mobile phones has raised global concerns about the negative health effects of its use. Adaptive response is the ability of a cell or tissue to better resist stress damage by prior exposure to a lesser amount of stress. This study aimed to assess whether radiofrequency radiation can induce adaptive r...

The effect of whole body gamma irradiation at the low exposure levels of 100, 200 and 400 r has been studied on the rate of growth of both juvenile and adult males and females of Clarias lazera. Irradiation causes, in general, significant retardation in rate of increase in length of growing fish. Such retardation is especially marked in adult females. Irradiation causes also diminution in the p...

Introduction: One of the protective concepts in the interpretation of radiation damage in radiobiology is the radioadaptive response. The objective of this present report is to evaluate the induction of radioadaptive response in male rats by injection of pre-irradiated serum with low doses X-radiation intraperitoneally.   Materials and Methods: 80 male adul...

objective(s) the possible risks of radio-frequency electromagnetic fields (emf) for the living organisms and human body are a growing concern for our society. in this study, we examined the possibility of changes in working memory and hippocampal histological characteristics effects in mice brain following whole body exposure to microwave radiation. materials and methods during gestation period...

background: drug resistance is widely believed to be an increasingly serious threat to global public health. we have previously reported that short term exposure of microorganisms to diagnostic ultrasound waves could significantly alter their sensitivity to antibiotics. in our previous studies, klebsiella pneumoniae showed major differences in the sensitivity to antibiotics in exposed and non-e...