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Sensitivity of Halobacterium salinarium to attractant light stimuli does not change periodically
Author(s) -
Krohs Ulrich
Publication year - 1994
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(94)00844-2
Subject(s) - sensitivity (control systems) , physics , biophysics , biological system , interval (graph theory) , optics , chemistry , biology , neuroscience , mathematics , combinatorics , electronic engineering , engineering
Halobacterium salinarium swims alternately in both directions of its cell axis. The average time between two reversals of the swimming direction is modulated by light stimuli. It is a matter of dispute whether the sensitivity to attractant stimuli depends on the time of stimulation during an interval. This question is crucial for model descriptions of the system. I have confirmed constancy of responsiveness with cells adapted to constant conditions and have reconstructed contradicting results. These are shown to be based on inadequate experimental and evaluative methods. The assumption of self‐sustained oscillations which modulate sensitivity can not be justified from the attractant response.