Main Title |
Exposure of Frog Hearts to CW or Amplitude-Modulated VHF Fields: Selective Efflux to Calcium Ions at 16 Hz. |
Author |
Schwartz, J. L. ;
House, D. E. ;
Mealing, G. A. R. ;
|
CORP Author |
Health Effects Research Lab., Research Triangle Park, NC. ;National Research Council of Canada, Ottawa (Ontario). |
Publisher |
c1990 |
Year Published |
1990 |
Report Number |
EPA/600/J-90/416; |
Stock Number |
PB91-171710 |
Additional Subjects |
Electromagnetic radiation ;
Calcium ;
Biological transport ;
Heart ;
Rana catesbeiana ;
Frequency ;
Nerve tissue ;
Statistical analysis ;
Radiation dose-response relationship ;
Reprints ;
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB91-171710 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
12p |
Abstract |
The effects of continuous and amplitude-modulated radiofrequency electromagnetic waves on calcium efflux from 45 Ca preloaded frog hearts were examined. Frog hearts, electrically stimulated at their natural beating frequency, were exposed for 30 min to 240 MHz radiowaves in a Crawford irradiation cell. Exposures at incident power levels of 0.5, 0.8, 1.0, 1.2, 5.0 and 10.0 Watts (corresponding to calculated specific absorption rates (SAR) of 0.15, 0.24, 0.30, 0.36, 1.50, and 3.00 mW/kg) were tested either in the continuous wave mode or using sinusoidal amplitude modulation at 0.5 Hz, the average beating frequency of the frog hearts, or at 16 Hz. Continuous at 0.5 Hz amplitude-modulated waves did not affect calcium efflux from the hearts. However, 16 Hz amplitude-modulated electromagnetic radiation resulted in statistically significant increases in calcium efflux. The effect was most significant at the 1 W incident power level (17.9%, p<0.01) but was also observed at 0.5 W(21.0%, p<0.05). Therefore, it appears that frog hearts are affected by electromagnetic radiation at particular power levels and 16 Hz modulation frequency, a bioelectromagnetic interaction displaying power and frequency windows comparable to those reported by other investigators in calcium efflux studies on neural tissue. |
Supplementary Notes |
Pub. in Bioelectromagnetics, v11 p349-358 1990. Prepared in cooperation with National Research Council of Canada, Ottawa (Ontario). |
NTIS Title Notes |
Journal article. |
Title Annotations |
Reprint: Exposure of Frog Hearts to CW or Amplitude-Modulated VHF Fields: Selective Efflux to Calcium Ions at 16 Hz. |
Category Codes |
57V; 57B |
NTIS Prices |
PC A03/MF A01 |
Primary Description |
600/10 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
114324758 |
Origin |
NTIS |
Type |
CAT |