نتایج جستجو برای: ionizing radiations
تعداد نتایج: 18300 فیلتر نتایج به سال:
Radiation safety is an important counterpart in all facilities utilizing ionizing radiations. The concept of radiation safety has always been a hot topic, especially with the late reports pointing to increased hazards with chronic radiation exposure. Adopting a nationwide radiation safety program is considered one of the most urging topics, and is a conjoint responsibility of multiple disciplin...
Background: Despite major diagnostic and industrial progresses in the technology and use of Ionizing radiations, they have been found to be harmful to the health of the radiology and nuclear medicine staffs. Since Ionizing radiations have the potential to produce free radicals, therefore, it is likely that the total plasma level of anti-oxidant in medical and nuclear medicine staffs could be re...
Cells exposed to densely ionizing radiation (high-LET) experience more severe biological damage than do cells exposed to sparsely ionizing radiation (low-LET). The prevailing hypothesis is that high-LET radiations induce DNA double strand-breaks (DSB) that are more complex and clustered, and are thereby more challenging to repair. Here, we present experimental data obtained by atomic force micr...
Hyperthermia in oncology needs a definite dose which fixes well the clinical protocols. The temperature is far not a dose, it is mass independent. The half of the mass has the same temperature in equilibrium, so the basic criteria of the dose mass-dependence are lost. The energy could be a great option for dosing, (like it is in radiation therapies by Gy) but it has numerous drawbacks. These ar...
Routine diagnostic X-rays (e.g., chest X-rays, mammograms, computed tomography scans) and routine diagnostic nuclear medicine procedures using sparsely ionizing radiation forms (e.g., beta and gamma radiations) stimulate the removal of precancerous neo-plastically transformed and other genomically unstable cells from the body (medical radiation hormesis). The indicated radiation hormesis arises...
Glioblastoma multiforme (GBM) is the most aggressive CNS tumor and is characterized by a very high frequency of clinical relapse after therapy and thus by a dismal prognosis, which strongly compromises patients survival. We have recently identified the small molecule SI113, as a potent and selective inhibitor of SGK1, a serine/threonine protein kinase, that modulates several oncogenic signaling...
A number of viruses have been subjected to various types of ionizing radiations in an attempt to correlate the structure of the elementary body with a given function. Some of the conclusions drawn from investigations on bacteriophage and animal viruses have been substantiated by other experimental methods. According to the target theory, the passage of an ionizing particle through a biological ...
Neurocognitive impairment is a serious adverse effect of radiation-based therapy [1]. It is well known that ionizing radiations induce oxidative stress on target tissues, mainly through the generation of reactive oxygen species (ROS) [2,3]. Spatial learning and memory are compromised after ionizing irradiation in rats using the Morris water maze test, and antioxidant-based diets are able to imp...
We present original characterizations of photo-radio-darkening in ytterbium-doped silica optical fibers submitted to the simultaneous action of the pump and of an ionizing radiation. We present the interplay between both radiations, showing e.g. that the pump is able to darken or bleach the fiber depending on the ionizing dose. The photoresistance of the fiber is shown to play a crucial role on...
Three bacteriophages (S-13, C-36 and S taph-K ) were irrad ia ted by y-rays, X -rays and a-rays. The survival curves were exponential, and the effect of a given dose was independent of the exposure tim e. F or any given phage the inactivation doses of the three radiations increased in the order y-rays, X -rays, a-rays, while for any given rad iation the inactivation doses of the three phages di...
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