electromagnetic field


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electromagnetic field

Public health
An invisible field of electromagnetic radiation on the spectrum of energetic particles that move as quanta (radiowaves, infrared, visible light, UV light and gamma radiation). EMFs are generated by moving electric charges that propagate outward from any object carrying an electric current, and result from: 
(1) The electric field that pushes or pulls ions toward or away from the field; the electrical component of an EMF is blocked by most objects, from skin to concrete, and has a strength of 1 mV/m2, which is similar to the strength of the cells’ intrinsic electrical activity;
(2) The magnetic field that acts on moving particles, pushing them perpendicularly to their direction of motion, which passes through most matter without losing strength; the actual power generated by a magnetic field is a few milligauss (1% of the strength of the earth’s magnetic field).

Tumour cells exposed in vitro to extremely low electromagnetic fields (ELF) of 60-Hz electromagnetic radiation from electrical distribution systems (power lines, video display terminals, household appliances) have increased mitotic activity; some reports have suggested that ELF radiation is associated with a 1.5–2.5-fold increase in leukaemia, lymphomas and intracranial malignancy, especially in children living near either 765-kV power lines or 15-kV distribution lines. Although ELF increases ornithine decarboxylase activity or cell membrane resistance to spontaneous lysis, the relationship of ELF to malignancy is controversial and inconclusive.

electromagnetic field

Abbreviation: EMF
The region in space in which the photons produced by moving electric charges have an effect. EMFs can be produced by power lines, radio waves, and microwaves. The energy produced in an EMF increases as the frequency of the photons increases, and EMFs produced by very high frequency photons (e.g., xrays and gamma rays) are sufficiently energetic to induce cancer.
See also: field
References in periodicals archive ?
Partridge, "Pulsed Electromagnetic Field Regulates MicroRNA 21 Expression to Activate TGF- [beta] Signaling in Human Bone Marrow Stromal Cells to Enhance Osteoblast Differentiation," Stem Cells International, vol.
(4) The initial stiffness of iron-powdered sand was determined by the confining pressure, relative density, iron powder content, and magnitude of the electromagnetic field. Among these controllable testing variables, the confining pressure and stiffness have major impact on the elastic modulus.
Part I: Return stroke current models with specified channel-base current for the evaluation of the return stroke electromagnetic fields," Electra, Vol.
Harrison, Jr., "The response of a terminated two-wire transmission line excited by a nonuniform electromagnetic field," IEEE Transactions on Antennas and Propagation, Vol.
ELECTROMAGNETIC FIELDS PRODUCED BY CELL PHONES, LAPTOPS, AND OTHER DEVICES ARE A GROWING CAUSE FOR CONCERN.
Here again it can be concluded that 15 minutes treatment of electromagnetic field (2mT), is the critical point of catalase activities.
Presented situations and welders are selected particular cases which emerged during the electromagnetic field measurements in varied HF welder surroundings, mostly ordered by owners or manufacturers.
In this context the present study examined the impact of high frequency electromagnetic fields (HF-EMF) at 900 MHz and 1800 MHz, used in mobile phone on the survival rate and on the morphology of bacterial cells.
Electromagnetic field levels radiated from RF and ELF are measured separately using proper equipment.
Bil-Lula et al., "Low frequency electromagnetic field conditioning protects against I/R injury and contractile dysfunction in the isolated rat heart," BioMed Research International, vol.
Once the final shape is achieved, an electromagnetic field is used to make the robot swim.
The two coils integrate to form an electrical transformer, with the secondary unit taking power from the electromagnetic field and converting it back into electric current to charge the battery.

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