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Subjection of a biological system to sound waves of sufficient intensity to modify their structure or function.
The exposure of a material, object, or patient to x-rays, gamma rays, ultraviolet rays, or other ionizing radiation.
An optical illusion which makes bright objects appear larger than they really are.



in physiology, the spread of excitation or inhibition in the central nervous system. Irradiation plays an important part in cerebrocortical activity. The irradiation of excitation is manifested most distinctly after strong stimulation, when nerve centers usually not involved in a reflex response are drawn into the process. For example, moderate pain inflicted on the skin of an animal’s foot causes the paw to flex in the talocalcaneal joint. Increasing the force of stimulation causes the leg to flex in the knee and hip joints. In studying the effect of an inhibitory conditioned stimulus, I. P. Pavlov showed that inhibition can also spread (irradiate) in the cells of the cerebral cortex.



the apparent enlargement of the dimensions of white (light) objects against a black (dark) background (given the comparatively great brightness of the white object) or, conversely, the apparent diminution of the dimensions of black objects against a white background. (The first instance is called positive irradiation; the second, negative.)

As a result of irradiation, a thin black thread or wire observed against a bright flame seems to be interrupted in that segment, and the bright crescent of the new moon seems to have a larger diameter than the ash-gray disk of the moon seen simultaneously with it. The degree of irradiation increases when the brightness of the light background or object increases. Irradiation is caused by optical defects of the eye (spherical and chromatic aberrations), diffraction phenomena in the eye, and imperfect fixation of the eye on the objects observed.


Kravkov, S. V. Glaz i ego rabota: Psikhofiziologiia zreniia, gigiena osvesh-cheniia, 4th ed. Moscow-Leningrad, 1950. (Includes bibliography.)
References in periodicals archive ?
As nuclear power plants age, materials that have been irradiated for several decades might require repair or replacement.
Full grown pupae were irradiated with substerilizing and sterilizing doses of gamma radiation (70 and 90Gy) which has been previously reported by Zahran et al.
This study also aimed to extract total phenolic compounds from irradiated purslane plant.
These variances often result in confusions in the worldwide trade of irradiated foods and hence a reliable and authentic method to identify irradiated products is required all the times [8, 9].
The most frequent condition requiring irradiated products was transfusion from blood relatives: of 2370 respondents, 1862 (78.
1] generation of irradiated males, the morphology and quantity of eupyrene and apyrene sperm bundles in testes of irradiated and non-irradiated males, and the morphology of eupyrene sperm in the bursae copulatrices of non-irradiated females mated with irradiated and non-irradiated males.
In fact, you're probably already eating irradiated products.
Figure 1 shows the tensile strength of un-irradiated and irradiated CS/CC biocomposite films with different CC content.
All irradiated foods have to be labeled as such; look for the phrases "treated with irradiation" or "with irradiation," as well as the radura, which is the international symbol for irradiation.
For the alkali halide single crystals irradiated with the gamma ray, color centers were able to anneal out at elevated temperatures (14-17).
8-10 mice were randomized into each of the following fifteen treatment groups: Non-irradiated control, Irradiated control GTP50 (100 and 50 mg/kg, p.
Abu Dhabi Irradiated foods are not available in the UAE market, the Abu Dhabi Food Control Authority (ADFCA) told Gulf News yesterday.