Abstract
THE results of 24-hr, rhythm measurements are frequently influenced by perturbations due to the presence of an observer and the measuring equipment. These perturbations can be minimized if the desired physiological data are obtained by radio telemetry1,2. The transmitter carried by the animal should be characterized by small size, long battery life, and sufficient range for unrestrained movements. Several transmitters with these design goals were constructed successfully and used to relay temperature and heart-rate information to a distant observer.
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References
Gold, D. C., Malcolm, J. L., J. Physiol., 135, 5P (1957).
Jacobson, B. S., and MacKay, R. S., Lancet, i, 1224 (1957).
Essler, W. O., and Folk, jun., G. E., Animal Behavior (in the press).
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ESSLER, W., EDGAR FOLK, G. Determination of Physiological Rhythms of Unrestrained Animals by Radio Telemetry. Nature 190, 90–91 (1961). https://doi.org/10.1038/190090a0
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DOI: https://doi.org/10.1038/190090a0
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