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| Moraes,M.F.D.; Ferrarezi,C.; Mont'Alverne,F.J.A.; Garcia-Cairasco,N.. |
| We describe a low-cost, high quality device capable of monitoring indirect activity by detecting touch-release events on a conducting surface, i.e., the animal's cage cover. In addition to the detecting sensor itself, the system includes an IBM PC interface for prompt data storage. The hardware/software design, while serving for other purposes, is used to record the circadian activity rhythm pattern of rats with time in an automated computerized fashion using minimal cost computer equipment (IBM PC XT). Once the sensor detects a touch-release action of the rat in the upper portion of the cage, the interface sends a command to the PC which records the time (hours-minutes-seconds) when the activity occurred. As a result, the computer builds up several files... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Circadian rhythm; Automated acquisition; Actograms; FFT; Cosinor; Chronobiology. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000800015 |
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| Mikulecky,M.; Lisboa,H.R.K.. |
| Between October 6, 1997 and April 30, 1999, 5011 births (mean: 8.76 per day) were registered in the city of Passo Fundo, South Brazil. The sequence of 572 daily birth numbers was not random (iteration test). Neyman distribution (m = ¥) showed the best fit. Clusters of days with higher birth numbers alternated with days with low numbers of births. Periodogram analysis revealed a significant periodicity of 6.98 days. The cosinor regression, testing 10 a priori supposed period lengths, found significant seasonality peaking in August-September and significantly highest birth numbers on Thursdays. Among the lunar and solar rotation cycles, the tropic lunar cycle and its 4th harmonic were most pronounced, in agreement with results concerning natality in Germany... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Births; South Brazil; Periodogram; Cosinor; Seasonality; Weekly rhythm; Multiseptans; Cosmogeophysical-biomedical parallelism; Solar and lunar cycles. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000800017 |
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