Impulse responses in bacterial chemotaxis
Identifieur interne : 000806 ( Main/Exploration ); précédent : 000805; suivant : 000807Impulse responses in bacterial chemotaxis
Auteurs : Steven M. Block [États-Unis] ; Jeffrey E. Segall [États-Unis] ; Howard C. Berg [États-Unis]Source :
- Cell [ 0092-8674 ] ; 1982.
English descriptors
- Entity :
- Teeft :
- Acad, Adaptation time, Angular velocity, Appropriate magnitude, Arbitrary stimulus, Arbitrary time, Attractant, Attractant response, Autocorrelation function, Average reversal rate, Bacterial chemotaxis, Bacterial motility, Bacterial time figure, Bandpass property, Baseline, Berg, Biphasic character, Cell move, Characteristic time, Che6 deletion, Chemoreceptor occupancy, Chemotactic, Chemotactic behavior, Chemotaxis, Chemotaxis protein, Cher, Cher deletion, Cher gene, Chez, Chez mutant, Coli, Convolution, Current trajectory, Datum, Deletion, Derivative, Different cell, Diffusive wave, Directional bias, Double deletion, Escherichia, Escherichia coli, Event marker, Excitation, Experimental procedure, External medium, First lobe, First second, Flagellar, Flagellar filament, Flagellar motor, Flagellar rotation, Gene product, High frequency, High response threshold, Identical time course, Impulse response, Individual record, Initial mode, Initial peak, Initial phase, Initial state, Initial value, Instantaneous reversal rate, Interval equal, Iontophoretic, Iontophoretic technique, Koshland, Latency, Limited amount, Limited range, Macnab, Many second, Maximally sensitive, Maximum value, Mechanism responsible, Memory time, Methylaccepting chemotaxis protein, Methylation, Motility, Motility medium, Msec, Much smaller, Multiple methylation, Mutant, Mutant cell, Nickel chloride, Nonchemotactic mutant, Parkinson, Pathway, Phase discontinuity, Physiological property, Pipette, Prestimulus value, Probability function, Proc, Rate constant, Real datum, Recent review, Repellent, Repellent response, Response latency, Reversal, Reversal rate, Reversible carboxymethylation, Rotation interval, Rotational, Rotational behavior, Rotational bias, Same response, Same time course, Segall, Sensory input, Sensory system, Sensory transduction, Serious problem, Short impulse, Shorter time, Signal processing, Signal subject, Similar response, Similar time course, Single cell, Solid line, Spatial gradient, Spontaneous reversal, Springer, Statistical fluctuation, Step stimulus, Stimulus current, Subsequent analysis, Tedesco, Third order filter, Thorium chloride, Time axis, Time constant, Time course, Time derivative, Time domain, Time figure, Time scale, Time span, Total number, Tumble mode, Undershoot, Vertical line.
Abstract
Abstract: The chemotactic behavior of Escherichia coli has been studied by exposing cells tethered by a single flagellum to pulses of chemicals delivered iontophoretically. Normally, wild-type cells spin alternately clockwise and counterclockwise, changing their direction on the average approximately once per second. When cells were exposed to a very brief diffusive wave of attractant, the probability of spinning counterclockwise quickly peaked, then fell below the prestimulus value, returning to baseline within a few seconds; repellent responses were similar but inverted. The width of the response indicates that cells integrate sensory inputs over a period of seconds, while the biphasic character implies that they also take time derivates of these inputs. The sensory system is maximally tuned to concentration changes that occur over a span of approximately 2 sec, an interval over which changes normally occur when cells swim in spatial gradients; it is optimized to extract information from signals subject to statistical fluctuation. Impulse responses of cells defective in methylation were similar to those of wild-type cells, but did not fall as far below the baseline, indicating a partial defect in adaptation. Impulse responses of cheZ mutants were aberrant, indicating a serious defect in excitation.
Url:
DOI: 10.1016/0092-8674(82)90421-4
Affiliations:
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Le document en format XML
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<term>Infectious Diseases</term>
<term>National Institute of Allergy</term>
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<term>J. Adler</term>
<term>J. S. Parkinson</term>
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<term>Paul Meyer</term>
<term>Responses</term>
<term>Robert Smyth</term>
<term>Time Figure</term>
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<keywords scheme="Teeft" xml:lang="en"><term>Acad</term>
<term>Adaptation time</term>
<term>Angular velocity</term>
<term>Appropriate magnitude</term>
<term>Arbitrary stimulus</term>
<term>Arbitrary time</term>
<term>Attractant</term>
<term>Attractant response</term>
<term>Autocorrelation function</term>
<term>Average reversal rate</term>
<term>Bacterial chemotaxis</term>
<term>Bacterial motility</term>
<term>Bacterial time figure</term>
<term>Bandpass property</term>
<term>Baseline</term>
<term>Berg</term>
<term>Biphasic character</term>
<term>Cell move</term>
<term>Characteristic time</term>
<term>Che6 deletion</term>
<term>Chemoreceptor occupancy</term>
<term>Chemotactic</term>
<term>Chemotactic behavior</term>
<term>Chemotaxis</term>
<term>Chemotaxis protein</term>
<term>Cher</term>
<term>Cher deletion</term>
<term>Cher gene</term>
<term>Chez</term>
<term>Chez mutant</term>
<term>Coli</term>
<term>Convolution</term>
<term>Current trajectory</term>
<term>Datum</term>
<term>Deletion</term>
<term>Derivative</term>
<term>Different cell</term>
<term>Diffusive wave</term>
<term>Directional bias</term>
<term>Double deletion</term>
<term>Escherichia</term>
<term>Escherichia coli</term>
<term>Event marker</term>
<term>Excitation</term>
<term>Experimental procedure</term>
<term>External medium</term>
<term>First lobe</term>
<term>First second</term>
<term>Flagellar</term>
<term>Flagellar filament</term>
<term>Flagellar motor</term>
<term>Flagellar rotation</term>
<term>Gene product</term>
<term>High frequency</term>
<term>High response threshold</term>
<term>Identical time course</term>
<term>Impulse response</term>
<term>Individual record</term>
<term>Initial mode</term>
<term>Initial peak</term>
<term>Initial phase</term>
<term>Initial state</term>
<term>Initial value</term>
<term>Instantaneous reversal rate</term>
<term>Interval equal</term>
<term>Iontophoretic</term>
<term>Iontophoretic technique</term>
<term>Koshland</term>
<term>Latency</term>
<term>Limited amount</term>
<term>Limited range</term>
<term>Macnab</term>
<term>Many second</term>
<term>Maximally sensitive</term>
<term>Maximum value</term>
<term>Mechanism responsible</term>
<term>Memory time</term>
<term>Methylaccepting chemotaxis protein</term>
<term>Methylation</term>
<term>Motility</term>
<term>Motility medium</term>
<term>Msec</term>
<term>Much smaller</term>
<term>Multiple methylation</term>
<term>Mutant</term>
<term>Mutant cell</term>
<term>Nickel chloride</term>
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<term>Parkinson</term>
<term>Pathway</term>
<term>Phase discontinuity</term>
<term>Physiological property</term>
<term>Pipette</term>
<term>Prestimulus value</term>
<term>Probability function</term>
<term>Proc</term>
<term>Rate constant</term>
<term>Real datum</term>
<term>Recent review</term>
<term>Repellent</term>
<term>Repellent response</term>
<term>Response latency</term>
<term>Reversal</term>
<term>Reversal rate</term>
<term>Reversible carboxymethylation</term>
<term>Rotation interval</term>
<term>Rotational</term>
<term>Rotational behavior</term>
<term>Rotational bias</term>
<term>Same response</term>
<term>Same time course</term>
<term>Segall</term>
<term>Sensory input</term>
<term>Sensory system</term>
<term>Sensory transduction</term>
<term>Serious problem</term>
<term>Short impulse</term>
<term>Shorter time</term>
<term>Signal processing</term>
<term>Signal subject</term>
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<term>Similar time course</term>
<term>Single cell</term>
<term>Solid line</term>
<term>Spatial gradient</term>
<term>Spontaneous reversal</term>
<term>Springer</term>
<term>Statistical fluctuation</term>
<term>Step stimulus</term>
<term>Stimulus current</term>
<term>Subsequent analysis</term>
<term>Tedesco</term>
<term>Third order filter</term>
<term>Thorium chloride</term>
<term>Time axis</term>
<term>Time constant</term>
<term>Time course</term>
<term>Time derivative</term>
<term>Time domain</term>
<term>Time figure</term>
<term>Time scale</term>
<term>Time span</term>
<term>Total number</term>
<term>Tumble mode</term>
<term>Undershoot</term>
<term>Vertical line</term>
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<front><div type="abstract" xml:lang="en">Abstract: The chemotactic behavior of Escherichia coli has been studied by exposing cells tethered by a single flagellum to pulses of chemicals delivered iontophoretically. Normally, wild-type cells spin alternately clockwise and counterclockwise, changing their direction on the average approximately once per second. When cells were exposed to a very brief diffusive wave of attractant, the probability of spinning counterclockwise quickly peaked, then fell below the prestimulus value, returning to baseline within a few seconds; repellent responses were similar but inverted. The width of the response indicates that cells integrate sensory inputs over a period of seconds, while the biphasic character implies that they also take time derivates of these inputs. The sensory system is maximally tuned to concentration changes that occur over a span of approximately 2 sec, an interval over which changes normally occur when cells swim in spatial gradients; it is optimized to extract information from signals subject to statistical fluctuation. Impulse responses of cells defective in methylation were similar to those of wild-type cells, but did not fall as far below the baseline, indicating a partial defect in adaptation. Impulse responses of cheZ mutants were aberrant, indicating a serious defect in excitation.</div>
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