نتایج جستجو برای: external environmental radiation
تعداد نتایج: 775132 فیلتر نتایج به سال:
objective(s): radiation therapy for breast cancer can induce myocardial capillary injury and increase cardiovascular morbidity and mortality. a prospective cohort was conducted to study the prevalence of myocardial perfusion abnormalities following radiation therapy of left-sided breast cancer patients as compared to those with right–sided cancer. methods: to minimize potential confounding fact...
This study was designed to investigate whether or not chronic exposure to Chornobyl radiation poses a molecular genetic risk to mammals by examining a relatively rapidly evolving genetic system, mitochondrial DNA (mtDNA). More mtDNA mutations (approximately 19%) and an increase in mtDNA heteroplasmy (approximately 5%) occurred in the cytochrome b gene of an exposed mother-embryo set when compar...
In this note, the dynamics of a regular polynomial map of C 2 is investigated. Especially, landing points of the external rays are completely characterized.
We investigate the set of parameters κ ∈ C for which the singular orbit (0, eκ, . . .) of Eκ(z) := exp(z + κ) converges to ∞. These parameters are organized in smooth curves in parameter space called parameter rays.
Ionizing radiation that consists of α, β and γ rays can directly damage DNA and other molecules and as such result in somatic or germline mutations. The consequences of ionizing radiation for living beings cannot be measured with a Geiger counter because it will depend on external dose, internal dose, and the extent of DNA repair. In addition it will depend on the environmental conditions under...
background: natural radiation is constantly present in the environment and is emitted from a variety of natural and artificial sources. it affects human body and environment. materials and methods: the activity concentrations of 238u, 232th and 40k have been determined by gamma ray spectrometer with an hpge detector in sediments of cauvery river, tamilnadu, india. results: the absorbed dose rat...
One of the most important tasks of the Human Resource Management (HRM) is employee retention. Hence, turnover rate is used to evaluate the HRM’s performance, and it is considered to be ok where the turnover rate is normal. However there exists another side for the coin which has got a lot to do with the reasons why the employees remain in the organization. By no doubt, the employee retention ba...
For diagnosing radiation optic neuropathy (RON) ophthalmological and imaging data were evaluated from 63 acromegalic patients, irradiated between 1967 and 1998. Two patients developed RON: one patient in one optic nerve 10 years and another patient in both optic nerves 5 months after radiation therapy. RON is a rare complication after external beam radiation therapy for acromegaly, which can oc...
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