title: Modeling of the thermoregulation system in the skunk cabbage: Symplocarpus foetidus.
abstract: This paper presents a model of the thermoregulation system of the spadix of skunk cabbage Symplocarpus foetidus which regulates its internal temperature at around 20 degrees C during flowering even when the ambient air temperature drops below freezing. From the temperature responses of the spadix to changing ambient air temperature, we assumed that the thermoregulation system of the spadix is probably one of negative feedback control. The feedback signals are based on the rate of temperature change of the spadix over time. A signal is factored into the biochemical energy generator, and becomes biochemical energy, some of which becomes heat. Comparing our proposed model temperature responses and those of the living spadix, we found good agreement. In the process of engineering the model, the existence of two regulatory pathways in the thermoregulation system was simulated, and our proposed model appears to provide the necessary elements to explain the fundamental mechanism of the thermoregulation system of S. foetidus.
authors.affiliation: Department of Electrical and Electronic Engineering, Faculty of Engineering, Iwate University, 4-3-5, Ueda, Morioka, Iwate 020-8551, Japan. t5306004@iwate-u.ac.jp
authors.forename: Ken
authors.initials: K
authors.lastname: Takahashi
authors.forename: Takanori
authors.initials: T
authors.lastname: Ito
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Onda
authors.forename: Takehiro
authors.initials: T
authors.lastname: Endo
authors.forename: Shigeki
authors.initials: S
authors.lastname: Chiba
authors.forename: Kikukatsu
authors.initials: K
authors.lastname: Ito
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Osada
mesh_terms: D029064:Araceae / Q000502:physiology*; D001833:Body Temperature Regulation / Q000502:physiology*; D003198:Computer Simulation; D025461:Feedback, Physiological / Q000502:physiology; D008954:Models, Biological; D015203:Reproducibility of Results; D013696:Temperature