Low-frequency electromagnetic pulses enhance Ca2+ uptake by chick small intestine in vitro |
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| Affiliation: | 1. Division of General Surgery, University of Toronto, Toronto, Ontario, Canada;2. Division of Surgical Oncology, Sunnybrook Health Sciences Centre–Odette Cancer Centre, Toronto, Ontario, Canada;3. Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada;4. Division of Clinical Pathology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada;5. Division of General Surgery, Mount Sinai Hospital, Toronto, Ontario, Canada;6. Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada;1. Department of Diagnosis and Surgery, Institute of Science and Technology of Sao Jose dos Campos, Universidade Estadual Paulista (unesp), Sao Jose dos Campos, SP, Brazil;2. Graduate student of institute of Science and Technology of Sao Jose dos Campos, Universidade Estadual Paulista (Unesp), São José dos Campos, SP, Brazil;3. Postgraduate Program in Dentistry, Cruzeiro do Sul University (UNICSUL), Sao Paulo, Sao Paulo, Brazil |
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| Abstract: | The effect of external EMF on Ca2+ uptake by the chick small intestine was investigated in vitro by use of the accumulating preparations of epithelial tissue. The intestinal tissue preparations were exposed to EMF in specific zones of Helmholtz coils. The steady magnetic field (SMF) having an induction value B0 = 1.14 mT, as well as pulsed EMF—constant pulse rate (f = 80 Hz) and randomized pulse rate (in range of 40–120 Hz)-with amplitude BM = B0 was used. The fall time of the pulse was changed stepwise in the range 0.15–0.55 ms.It was found that SMF, as well as pulsed EMF significantly enhanced the uptake of Ca2+ by the small intestine. A SMF was found to enhance uptake by up to 40–50% for both normal (D) and rachitic chicks. The effects of the induced Erot depended essentially of vitamin D status of chicks due to the complex action of vitamin D-dependent factors. The effect of randomized pulse EMF was qualitatively similar to that of constant pulse EMF, but quantitatively it was less. Data indicate the contribution of the B-, as well as E-component to the modification of the Ca2+ uptake. |
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