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Related Concept Videos

Thermosensation01:43

Thermosensation

Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.

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Related Experiment Video

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Novel Assay for Cold Nociception in Drosophila Larvae
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STIMULATION BY COLD IN NITELLA.

S E Hill1

  • 1Laboratories of The Rockefeller Institute for Medical Research.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Sudden chilling of Nitella and Chara triggers action currents, unlike gradual chilling. This response is linked to protoplasmic changes and increased sensitivity to mechanical stimuli.

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Area of Science:

  • Plant Physiology
  • Cell Biology
  • Biophysics

Background:

  • Plant cells like Nitella and Chara exhibit electrical responses to stimuli.
  • Local chilling is a physical stressor that can affect cellular processes.

Purpose of the Study:

  • To investigate the effect of sudden versus gradual local chilling on action currents in Nitella and Chara.
  • To explore the underlying mechanisms and cellular changes associated with chilling-induced electrical activity.

Main Methods:

  • Applied sudden and gradual local chilling to Nitella and Chara.
  • Monitored the generation of action currents.
  • Assessed cellular sensitivity to mechanical stimulation.
  • Measured electrical resistance and action curve characteristics.

Main Results:

  • Sudden local chilling induced action currents, while gradual chilling did not.
  • Chilled areas showed increased sensitivity to mechanical stimulation.
  • Chilling led to increased electrical resistance, slower recovery post-stimulation, and reduced action curve magnitude.

Conclusions:

  • Sudden chilling likely causes partial solidification of protoplasmic surfaces, leading to rupture and action current generation.
  • Chilling significantly alters the electrical properties and mechanical sensitivity of Nitella and Chara cells.