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Journal of Biological Rhythms
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The Stability of the Circadian Rhythm of Green Finches (Carduelis chloris) under the Influence of a Weak Electrical Field

Thomas Lintzen

Max-Planck-Institut für Biochemie, 8033 Martinsried, Federal Republic of Germany

Günter Boese

Max-Planck-Institut für Biochemie, 8033 Martinsried, Federal Republic of Germany

Michael Müller

Max-Planck-Institut für Biochemie, 8033 Martinsried, Federal Republic of Germany

Joseph Eichmeier

Technische Universität München, 8000 München, Federal Republic of Germany

Gerhard Ruhenstroth-Bauer

Max-Planck-Institut für Biochemie, 8033 Martinsried, Federal Republic of Germany

Free-running activity rhythms of nine green finches (Carduelis chloris) were stud ied under the influence of a 10-Hz square-wave electrical field. With a field strength of |E| = 2.5 V/m in the empty cage, the population had a mean period of 23.64 ± 0.77 hr. In the same experiment, but without the electrical field, the period was 23.66 ± 0.80 hr. These results are in contradiction to Wever's description of a field-induced shortening of the period. A series of experiments with 10-Hz pulses of the same square-wave form, yet with various field strengths (8.7 and 65.2 V/m), also gave no effects.

Journal of Biological Rhythms, Vol. 4, No. 3, 371-376 (1989)
DOI: 10.1177/074873048900400306
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