PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Radiation, Nonionizing”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 523 records · Page 29Linked to original sources
PubMedDate not supplied

[The physiological role and significance of prostaglandins in the reaction of the body to unfavorable environmental factors].

This review discusses the use of parameters of prostaglandin metabolism as criteria of human body resistance to adverse environmental effects. The paper presents observations indicating involvement of prostaglandins in responses to stress, hypoxia and ischemia. It is shown that the primary response to such effects as ionizing radiation, microwave radiation, noise, vibration, exercise, microgravity is usually characterized by increases in the concentration of most prostaglandins in organs and tissues. Development of extreme states and diseases leads to dysbalance of major prostaglandins. Knowledge of the changes involved may help improve diagnostic approaches and reliable use of prostaglandin-based drugs, their activators and inhibitors for therapeutic purposes.

Adaptation, Physiological↗
PubMed1987

[Considerations on the protection of non-ionizing radiation workers].

After a brief examination of the physical properties and biological effects on man of e.m. and u.s. type N.I.R., their most common fields of use in industry and medicine are described. The report goes on to examine the risks and possible damage that may be incurred by those who work with these radiations on the basis of their intensity and the type and distance of the source as well as their duration with particular reference to the so-called "target" organs. The hope is then expressed that regulations will be produced for the protection of these workers. Particularly as far as preventive medicine is concerned such regulations should be on the same lines as those formulated for workers with ionising radiations by Presidential Decree 185/64 in line with E.E.C. and I.C.R.P. recommendations.

Humans↗
PubMed1979

Photoimmunology.

Explore the source record for details and available documents.

Allergy and Immunology↗
PubMedDate not supplied

[Effect of electromagnetic fields of a millimeter range on the blood system of animals depending upon their initial state and the zone of irradiation].

As a result of cytological investigations it was discovered that the millimeter range microwaves being applied once during one hour stimulated erythrocytopoiesis of intact mice and induced a change of the lymphocytes number in the blood. The reaction to the microwaves depends on the location of irradiation and animal initial state, which was estimated pertinent to the red blood cells and white blood cells number in the peripheric blood. These factors are of prognostic importance. For mice with initial white and red blood cells numbers less than 12 X 10(9) l and 8 X 10(12) l the change of erythrocytopoiesis in the left thigh and thorax bone marrow took place and lymphopenia developed due to the irradiation of hind left leg. For other animals the stimulation of erythrocytopoiesis in the right thigh bone marrow and lymphocytes was registered due to microwaves irradiation of the hind right leg. The microwave effect is considered as a combination of local and general changes. On the basis of quantitative analysis the preferable mechanism of microwaves action on the whole organism level is discussed.

Animals↗
PubMed1985

[Introduction to thermoluminescence--simple models].

Thermoluminescence comprises two fundamental processes, one proceeding at a constant temperature during the stimulation of the solid body by electromagnetic radiation or particle radiation, the other when the specimen is heated. The light emission during the rise of temperature can show several maxima and is called thermoluminescence glow curve. In some cases a thermally stimulated conductivity and a thermally stimulated emission of exoelectrons can be observed and correlated with thermoluminescence. The observations can be phenomenologically analyzed, not considering the physical processes of thermal activation and radiative recombination as well as the atomistic structure of the centres involved. Cinetic balance equations based on the energy band model are described. Some glow curves of thermoluminescence can be calculated in simple models, where the concentration of the charge carriers in traps, in permitted energy bands and in activators during the heat input are approximately determined.

Fluorescence↗
PubMed1985

[The theory of thermoluminescence].

The interaction of stimulating radiation with matter produces defects which can be divided into two groups: 1. electronic defects, 2. ionic defects. The formation of defects is essentially determined by electronic processes and elastic impacts. The supply of energy in the form of heat makes possible a thermal stimulation the probability of which is characterized by a Boltzmann factor. Whereas the classical explications are based on thermodynamic or statistical considerations, the quantum mechanical calculation relates to non-radiative transitions from traps. For the radiating recombination a selective rule is valid which guarantees the conservation of energy and impulse. The phenomenological description of thermoluminescence makes use of the kinetic processes in the non-stationary case and allows in simple models the determination of trap parameters, such as activation energy or pre-exponential factor. The simple models can be extended by introducing thermally separated trap levels. If the kinetic balance equations are solved exactly with the aid of an analogic computer, the simulated Glow curves show a good correspondence with experimental curves.

Computers, Analog↗