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Doctoral Thesis
DOI
10.11606/T.43.1997.tde-06122013-161839
Document
Author
Full name
Gisele Akemi Oda
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1997
Supervisor
Committee
Caldas, Ibere Luiz (President)
Bicudo, Jose Eduardo Pereira Wilken
Ito, Amando Siuiti
Marques, Mirian David
Sartorelli, Jose Carlos
Title in Portuguese
Ritmos Biológicos Observados em Insetos Cavernícolas
Keywords in Portuguese
Cronobiologia
Fisiologia animal
Abstract in Portuguese
Este trabalho consiste na realização experimental de uma Curva de Resposta de Fases (PRC) de ritmos biológicos infradianos observados em insetos cavernícolas da espécie Folsomia candida. Sendo os insetos cegos, utilizamos pulsos de temperatura para provocar os deslocamentos de fase. Obtivemos PRCs com apenas atrasos, com a característica topológica do Tipo 1, para as três durações diferentes dos pulsos utilizados. Essa característica difere das típicas respostas observadas nos osciladores do tipo ciclo-limite, os quais são associadas à maioria dos ritmos biológicos. A dimensão de um oscilador determina quais os tipo de PRCs que o sistema pode apresentar, quando sujeito a perturbações, em suas diferentes fases. Relógios simples são associados a ciclos constituídos por uma sequência discreta de eventos encadeados, estando cada evento dependente do término do anterior, para se iniciar. Esses são sistemas unidimensionais, diferindo dos ciclos-limites pela impossibilidade de apresentar PRCs do Tipo 0 e singularidades de fase. Associamos um modelo de relógios simples para os ritmos infradianos estudados, baseados nas características observadas nas PRCs e por estar de acordo com as bases fisiológicas dos mesmos.
Title in English
Biological rhythms observed in cave insects.
Keywords in English
Animal physiology
Chronobiology
Abstract in English
In this work, we constructed Phase Resetting Curves (PRC) of the infradian biological rhythms of the cave insects Folsomia candida. We used temperature pulses to reset the phases of these rhythms, since the insects are blind. We obtained PRCs with delays only, of the topological Type 1, for the three different pulse durations. This is an unusual behavior, considering the typical responses of the limit-cycle oscillators associated to the majority of the biological rhythms. The dimension of an oscillator determines the PRC types that a system, submitted to pulses at different phases, can present. Simple clocks are associated to a sequence of discrete linked events, each event leading to the next and playing a functional role in generating the rhythmicity. They are unidimensional systems and can't present Type O PRCs and singularities, as the two-dimensional limit cycles. Based on the properties of the experimental curves and knowing the phisiological bases of these insect rhythms, we propose a simple clock model for the infradian rhythms studied here.
 
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45878AkemiOda.pdf (50.92 Mbytes)
Publishing Date
2014-02-21
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • ODA, G. A., et al. Coupled Biological Oscilator in a Cave Insect. Journal of Theoretical Biology, 2000, vol. 206, p. 515-524.
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