System analysis of Phycomyces light-growth response with sum-of-sinusoids test stimuli.

P. Pratap, A. Palit, E. D. Lipson

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The light-growth response of Phycomyces has been studied with the sum-of-sinusoids method of nonlinear system identification (Victor, J.D., and R.M. Shapley, 1980, Biophys. J., 29:459). This transient response of the sporangiophore has been treated as a black-box system with one input (logarithm of the light intensity, I) and one output (elongation rate). The light intensity was modulated so that log I, as a function of time, was a sum of sinusoids. The log-mean intensity was 10(-4) W m-2 and the wavelength was 477 nm. The first- and second-order frequency kernels, which represent the linear and nonlinear behavior of the system, were obtained from the Fourier transform of the response at the appropriate component and combination frequencies. Although the first-order kernel accounts for most of the response, there remains a significant nonlinearity beyond the logarithmic transducer presumed to occur at the input of the sensory transduction chain. From the analysis of the frequency kernels, we have derived a dynamic nonlinear model of the light-growth response system. The model consists of a nonlinear subsystem followed by a linear subsystem. The model parameters were estimated from a combined nonlinear least-squares fit to the first- and second-order frequency kernels.

Original languageEnglish (US)
Pages (from-to)645-651
Number of pages7
JournalBiophysical Journal
Volume50
Issue number4
StatePublished - Oct 1986
Externally publishedYes

Fingerprint

Phycomyces
Systems Analysis
Light
Growth
Nonlinear Dynamics
Fourier Analysis
Least-Squares Analysis
Transducers

ASJC Scopus subject areas

  • Biophysics

Cite this

System analysis of Phycomyces light-growth response with sum-of-sinusoids test stimuli. / Pratap, P.; Palit, A.; Lipson, E. D.

In: Biophysical Journal, Vol. 50, No. 4, 10.1986, p. 645-651.

Research output: Contribution to journalArticle

Pratap, P, Palit, A & Lipson, ED 1986, 'System analysis of Phycomyces light-growth response with sum-of-sinusoids test stimuli.', Biophysical Journal, vol. 50, no. 4, pp. 645-651.
Pratap, P. ; Palit, A. ; Lipson, E. D. / System analysis of Phycomyces light-growth response with sum-of-sinusoids test stimuli. In: Biophysical Journal. 1986 ; Vol. 50, No. 4. pp. 645-651.
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