Search Results

1 - 10 of 45 items :

  • "electromagnetic radiation" x
Clear All
Propolis Supplementation and the Changes in the Oxidative Metabolism of Blood Platelets Exposed to Electromagnetic Radiation

electromagnetic radiation emitted by LCD screens - in vitro studies. Kwart. Ortop. 2011, 1, 31-37. 22. Koyu A. Ozguner F, Yilmaz H. The protective effect of caffeic acid phenethyl ester (CAPE) on oxidative stress in rat liver exposed to the 900 MHz electromagnetic field. Toxicol Ind Health. 2009 Jul;25(6):429-34. 23. Buczyński A., Pacholski K., Dziedziczak - Buczyńska and others; Alterations in the generation of free radicals in blood platelets exposed to electromagnetic radiation emitted by screen monitors; Polish Hyperbaric Research 2010; 1 (30).

Open access
The Effect of Atmospheric Electromagnetic Radiation on an Opened System

Abstract

In opened systems with liquid-phase (for example open-source bioreactors for various purposes) very significant temperature can be generated. The operation of the system can be impaired, possibly completely inhibited (too low, too high temperature values). The analytic description of the operation’s heat flow is needed to achieve the optimized operation and to block the thermodynamic inhibition. The aim is to examine the inner system opportunities and the auxiliary energy. The estimates values quantify the effects of atmospheric electromagnetic radiation on opened systems. Based on the developed model by increasing the complexity of the method, it is appropriate to describe the heat flow of opened systems and to explore the energy integration possibilities.

Open access
Stress and Fatigue in Operators Under Radiofrequency Electromagnetic Radiation and Shift Work

. Hutter, H. Subjective symptoms, sleeping problems and mobile phone base stations. - Occup. Environ. Med., 63, 2006, 307-313. 8 . Israel , M., Vangelova K., Ivanova M. Cardiovascular risk in physiotherapists under electromagnetic radiation. - Environmentalist 27, 2007, № 4, 539-543. 9 . ICNIRP. Guidelines for limiting exposure to time-varying electric, magnetic and electromagnetic fields (up to 300 GHz). - Health Physics, 74, 1998, № 4, 494-522. 10 . Knutsson , A. Health disorders of shift workers. - Occup. Med., 53

Open access
The Evaluation of Sanitary-Epidemiological Service Conditions On a Submarine

Abstract

Service on a submarine is the most stressful and psychologically challenging form of military service. It is characterised by specific living and sanitaryepidemiological conditions which are far from typical. This work is based on the analyses of reports formulated from research conducted by a working environment laboratory, and on the control protocols of the sanitary supervision and control team (WOMP) Gdynia, from the Kobben submersible vessels in the years 2014 and 2015. Military Centres of Preventive Medicine hold supervision over Military Units pursuant to generally applicable regulations in the civil environment and standardised NATO norms. Measurements concern the level of noise, mechanical vibrations, chemical agents, electromagnetic radiation, physiochemical and biological water and kitchenware tests. The objective of the research is to evaluate the service conditions on a submersible vessel with regard to sanitary-epidemiological aspects such as exposure to infectious and occupational diseases. In selected stations, the conducted measurements indicate an increased level of noise, electromagnetic radiation and excess quantities of bacteria colonies on kitchenware.

Open access
Combined Effects of 50 Hz Electromagnetic Field and SiO2 Nanoparticles on Oxidative Stress in Plant’s Gametic Cells / Zemfrekvences (50 Hz) Elekromagnētiskā Lauka Un SiO2 Nanodaļiņu Kombinētā Ietekme Uz Augu Gametisko Šūnu Oksidatīvo Stresu

Abstract

The paper presents the results of combined effects of an extremely low frequency electromagnetic field (50 Hz) (ELF EMF) and SiO2 nanoparticles on fluorescence of plant gametic cells (immature microspores). The data were recorded by a BD FACSJazz® cell sorter after cell irradiation by blue laser (488 nm). A significant difference of fluorescence was observed between gametic cells after 1 hour incubation in suspension of SiO2 nanoparticles and the control gametic cells. It was observed that fluorescence intensity of gametic cell was higher with ELF EMF treatment in comparison to control cells, but it was statistically significant only for cells treated with electromagnetic radiation field with density 100 μT (ρ < 0.01) and 400 μT (ρ < 0.01). A different effect of ELF EMF were observed in cells incubated in SiO2 nanoparticle suspension; interaction of the factors resulted in lower cell fluorescence in comparison to control cells. The present study showed that SiO2 nanoparticles may be a source of oxidative stress, but jointly with 50 Hz electromagnetic field they can serve as an efficient antioxidant

Open access
Cell nucleus and membrane recovery after exposure to microwaves

Cell nucleus and membrane recovery after exposure to microwaves

Cells of human buccal epithelium of six male donors were exposed to microwave radiation (frequency f = 36.64 GHz, power density W = 0.1, 1 and 4 W/m2). Exposure time was 10 seconds. The state of chromatin in cell nucleus was estimated by a number of heterochromatin granules after staining with 2% orcein in 45% acetic acid. Permeability of cell membranes was estimated by percentage of unstained cells after 5 min of staining the cells with vital dyes trypan blue (0.5%) and indigocarmine (5 mM). Cell exposure to microwaves induced chromatin condensation (increase of the number of heterochromatin granules) and increase of membrane permeability to trypan blue and indigocarmine. Isolated human buccal cells demonstrated the ability to recover after microwave exposure. The number of heterochromatin granules decreased to its initial level after 0.5 hour (W = 0.1 W/m2) and 2 hours (W = 1 and 4 W/m2) after cell exposure. Cell plasma membrane permeability recovered later — after 1 hour and 3 hours post exposure, respectively.

Open access
Effects of Electromagnetic Fields and their Shielding on the Quality of Carrot (Daucus Carota L.) Seeds

] Pietruszewski S, Muszyński S, Dziwulska A. Electromagnetic fields and electromagnetic radiation as non-invasive external stimulants for seeds (selected methods and responses). Int Agrophys. 2007;21:95-100. http://www.international-agrophysics.org/Electromagnetic-fields-and-electromagnetic-radiation-as-noninvasive-external-stimulants,106532,0,2.html . [23] Shabrangi A, Majd A, Sheidai M. Effects of extremely low frequency electromagnetic fields on growth, cytogenetic, protein content and antioxidant system of Zea mays L. Afr J Biotechnol. 2011;10(46):9362-9. DOI: 10

Open access
The Using of Millimeter Waves for Biosynthetic Processes Stimulation in Saccharomyces Cerevisiae

-21. 4. Cifra M., Pokorny J., Jelinek F., Hasek J., Simsa J. Ultra Low Frequency Yeast Cells Electric Activity. Microwave Technigues, 2008, COMITE 2008, 14 the Conferecce on, 23-24 april 2008, 1-4. 5. De Vita A., Croce R. P., Pinto I. M., and Bisceglia B. Nonlinear interaction of electromagnetic radiation the cell membrane level: response to stochastic fields. Progress In Electromagnetics Research B, 2011, Vol. 33, 45- 67. 6. Dey P., Harborn J. Methods in Plant Biochemistry. Carbohydr. Academic Press, 1993, vol. 2, 529 p

Open access
PAN fibers with nanoprecipitated Ag and Au for use in textronics

. Electromagnetic shielding effectiveness (SE) is defined as a logarithm of the ratio of power incident on the sample to the power measured behind the sample, in dB units. Therefore it can be expressed by equation: S E = 10 log ⁡ P 1 P 2 $$SE = 10\log \frac{{{P_1}}}{{{P_2}}}$$ (1) Fig. 1 Weft fabric prototypes (1.5 mm × 1.5 mm grid size) for the test connected with protective properties against electromagnetic radiation: (a) PAN fibers with silver nanoparticles, (b) PAN fibers with gold nanoparticles. where P 1 is power incident on the tested sample (mW

Open access
Microwave Electromagnetic Filed and Temperature Distribution in a Multilayered Wood-Cement Board

Microwave Electromagnetic Filed and Temperature Distribution in a Multilayered Wood-Cement Board

The aim of this work was theoretical considerations of a multi-layer structure and estimation of some properties of previously designed and prepared modified wood-cement boards. These were enriched by carbon powder as electric admixture to gain a high damping of electromagnetic radiation in microwave frequency region. The dissipated power and temperature assessment based on the heat and electromagnetic wave propagation in case of perpendicular incident radiation are presented. As a practical criteria of the shielding effectiveness —the drop of the temperature measured behind an irradiated multilayered shield was utilized.

Open access