title: Contraction behaviors ofVorticellasp. stalk investigated using high-speed video camera. I: Nucleation and growth model.
abstract: The contraction process of livingVorticellasp. has been investigated by image processing using a high-speed video camera. In order to express the temporal change in the stalk length resulting from the contraction, a damped spring model and a nucleation and growth model are applied. A double exponential is deduced from a conventional damped spring model, while a stretched exponential is newly proposed from a nucleation and growth model. The stretched exponential function is more suitable for the curve fitting and suggests a more particular contraction mechanism in which the contraction of the stalk begins near the cell body and spreads downwards along the stalk. The index value of the stretched exponential is evaluated in the range from 1 to 2 in accordance with the model in which the contraction undergoes through nucleation and growth in a one-dimensional space.
authors.affiliation: United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.
authors.forename: Junko
authors.initials: J
authors.lastname: Kamiguri
authors.affiliation: United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Tsuchiya
authors.affiliation: United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.
authors.forename: Ruri
authors.initials: R
authors.lastname: Hidema
authors.affiliation: United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Tachibana
authors.affiliation: United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.
authors.forename: Zenji
authors.initials: Z
authors.lastname: Yatabe
authors.affiliation: Department of Applied Physics, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi Koganei-shi, Tokyo 184-8588, Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Shoji
authors.affiliation: Department of Applied Chemistry and Biotechnology, Niihama National College of Technology, 7-1 Yakumo-Cho, Niihama, Ehime 792-8580, Japan.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Hashimoto
authors.affiliation: Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires, UMR 8531 CNRS, D'Alembert Institute, ENS Cachan, 61 av. President Wilson, F-94230 Cachan, France.
authors.forename: Robert Bernard
authors.initials: RB
authors.lastname: Pansu
authors.affiliation: Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183-8509, Japan.
authors.forename: Hideharu
authors.initials: H
authors.lastname: Ushiki
keywords: Vorticella sp.; damped mass spring system; high-speed video camera; image processing; nucleation and growth; stretched exponential