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Biomedical subjects

M Hrnjak

Publications and source records attributed to M Hrnjak.

At least 19 recordsLinked to original sources
PubMedDate not supplied

[Occupational injuries of the eye caused by optical irradiation].

On the basis of the increasing number of everyday exposures to numerous artificial sources of optical radiation (ultraviolet radiation, visible light, infrared radiation and laser), the probability of occupational and other ocular damages is increasing. The risk of vision damage due to sunlight radiation also exists during the staring at the sun with unprotected eyes especially in the time of eclipse, and the long stay in the bright light. In addition to ultraviolet radiation and short wavelengths of visible spectrum ("blue light") the photochemical (actinic) damage mechanism of the retina can occur. Numerous sources of ultraviolet radiation may cause acute photokerattoconjunctivitis; the long-term exposure to ultraviolet radiation possibly contributes to aging of the lens and to senile cataract, and also increases the risk of occurrence of conjunctival carcinoma and malignant melanoma of the eye. The infrared radiation of high intensity can produce corneal damage, probably cataract, and genuine thermal injury of the retina. Laser retinal injury, in its nature, is thermal, thermo-mechanical or with direct electric field effect.

Eye Diseases↗
PubMedDate not supplied

[Working environment conditions and occupational disorders in artillery unit personnel].

Occupational environment risk factors and health status of 172 soldiers and 89 officers were examined aiming to discover early signs of occupational diseases and disorders in artillery personnel. Among all physical and chemical risk factors noise caused by artillery and infantry firing (140 to over 170 dB) were the most frequent and among occupational diseases/disorders only perceptive hearing disorders being very frequent in artillery officers (65.22%) were found out. Preventive measures against occupational environment risk factors were suggested.

Adolescent↗
PubMedDate not supplied

Stimulatory effect of low-power density He-Ne laser radiation on human fibroblasts in vitro.

Cultures of human embryonic fibroblasts in vitro were subjected to helium-neon laser single and double irradiation to investigate the influence of low-energy laser irradiation on fibroblast proliferation. Mean increase in the cell number values of irradiated cells were compared with increase values of non-irradiated control samples of fibroblasts. He-Ne laser was used as a coherent source of monochromatic radiation at 632.8 nm, and Petri-dishes with cultured fibroblasts were irradiated in way to receive radiation of energy doses of 0.5; 1; 1.5 and 2J/cm2. Single He-Ne laser irradiation exhibited a significant stimulation effect on human fibroblast proliferation in cell-culture.

Cell Division↗