Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Maria ROMEROWICZ-MISIELAK"

The impact of electromagnetic fields with frequency of 50 Hz on metabolic activity of cells in vitro DOI:10.15199/48.2017.01.39

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The article presents the results of research on the influence of the sinusoidal electromagnetic field with a frequency of 50 Hz on the metabolic activity of two cell lines normal BJ and cancer 143b, with different exposure times (0.5 h, 1 h, 2 h and 3 h). It is shown the difference in its effect on cancer and physiological line. In order to analyze the viability there was performed the MTT test. Streszczenie. W artykule zostały zaprezentowane wyniki badań wpływu sinusoidalnego pola elektromagnetycznego o częstotliwości 50 Hz na aktywność metaboliczną dwóch linii komórkowych - normalnej BJ i nowotworowej 143b przy różnych czasach ekspozycji (0.5 h, 1 h, 2 h i 3 h). Wykazano różnice w oddziaływaniu na linię fizjologiczną oraz nowotworową. W celu dokonania analizy żywotności wykonano test MTT. (Oddziaływanie pola elektromagnetycznego o częstotliwości 50 Hz na aktywność metaboliczną komórek w warunkach in vitro) Keywords: electromagnetic field, the metabolic activity of cells, cancer cells Słowa kluczowe: pole elektromagnetyczne, aktywność metaboliczna, komórki nowotworowe Introduction For many years, scientists are trying to learn how the electromagnetic field affects the living organisms, including human. Many studies have shown that there may be a relationship between exposure to the electromagnetic field of low frequency (EL-EMF) and the illness of cancer in adults and children (eg. leukemia, central nervous system lymphoma) [1, 5]. There are also papers which do not confirm this relationship [3]. There is not known a relationship between radiation dose and its effect. This paper presents the results of study the effect of EL-EMF with frequency of 50 Hz on the metabolic activity of normal (human fibroblasts; BJ) and cancer (Human osteosarcoma; 143B) cell lines at various exposure times and different values of magnetic induction. Natural emitters of the electromagnetic field in the surrounding environment are the Earth, Sun, Space a[...]

An electromagnetic field with a frequency of 50 Hz and a magnetic induction of 2.5 mT affects spermatogonia mouse cells (GC-1spg line) DOI:10.15199/48.2018.06.25

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In the era of technology and telecommunication development, there are more and more sources of electromagnetic field with frequencies previously not found in nature. The electromagnetic field is a system of two interrelated fields: electric and magnetic, and it is possible at each point of it to determine the vectors of electric field strength E and intensity of the magnetic field H [Gryz et al. 2011]. Electrical component of the electromagnetic field means the interaction between electrically charged particles or bodies moving in any way in relation to the inertial reference system [Różycki 2011]. The vector of an electric field intensity describing an electric field, which unit in the SI system is Newton on a coulomb can be defined by the formula: (1) E 􀵌 􀭊 􀭯 where: F - force that the electric field exerts in a given location per unit point charge, q - value of this charge. The magnetic component of the electromagnetic field determined in amperes per meter is produced by the change of electric field over time by the system of moving loads. The magnetic field intensity vector H can be expressed as: (2) ∮ H 􀵈 dI 􀵌 I where: H - intensity of the magnetic field, I - current flowing through any surface extending over the closed contour. The electromagnetic field can affect physical objects, including living organisms. The effect of its influence depends on many factors, and the most important are: 1) field intensity; 2) the distance of the object from the field emission source; 3) frequency of radiated energy (Halliday et al., 2001). Numerous scientific studies have shown that the male reproductive system is one of the most sensitive organs to electromagnetic radiation. Exposure to electromagnetic field of extremely low frequency (0-300 Hz) (ELF-EMF), both in humans and animals, can lead to decreased sperm quality by reducing motility, viability and sperm morphological c[...]

Electromagnetic field as an environmental factor affecting MCF-7 cell line in vitro DOI:10.15199/48.2019.05.02

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The electromagnetic field (EMF) is defined as the energy state of the space that surrounds the electric charges in motion. The propagation of this energy takes place through electromagnetic radiation [8], which is characterized by the orderly and mutual interaction of magnetic and electric fields. The occurrence of electric charges with opposite signs results in the creation of an electric field [5], which characteristic magnitude is the intensity expressed in the SI system in newtons per coulombs. However, the intensity of the magnetic field is expressed in amperes per meter and is generated by the movement of these charges - the flow of electric current [5]. One of the main parameters describing the electromagnetic field is the frequency f, expressed in the SI system in hertz [Hz] and determining the variability of EMF over time [8]. There is a natural electromagnetic field in the environment, which is emitted by the Sun and Earth and artificial, resulting from the construction of infrastructure emitting fields of unprecedented frequencies - base stations of mobile telephony, high voltage transmission lines, transformer or radar stations, or radio navigation devices [6]. The rapid development of technology has led to an uncontrolled increase in the number of field emitters that overlap each other to create electromagnetic noise. All everyday equipment, powered from the industrial network, generates a 50 Hz field, while EMF in the radio and microwave range (100 kHz - 300 GHz) is produced, among others via TV and radio transmitters, cell phones or microwave ovens. The EMF is used in both diagnostics and therapy. The field used in medicine achieves the value of magnetic induction from picotesla to a few tesla, and the frequencies used assume values from 0 to gigahertz [9] Exposure of living organisms to EMF can cause various biological effects depending on the intensity, frequency, dose and time of exposure to EMF. It has [...]

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