Document Detail

Ionic mechanisms controlling behavioral responses of paramecium to mechanical stimulation.
MedLine Citation:
PMID:  5768366     Owner:  NLM     Status:  MEDLINE    
A mechanical stimulus applied to the anterior part of Paramecium causes a transient increase in membrane permeability to calcium. This permits a calcium current to flow into the cell, causing the membrane potential to approach the equilibrium level for calcium. The transient depolarization which results elicits a reversal in the direction of ciliary beat. When the organisms are free-swimming this is seen as the reversed locomotion of Jennings' "avoiding reaction." In contrast, a mechanical stimulus applied to the posterior part results in increased permeability to potassium ions, and hence an outward potassium current. The hyperpolarization which results causes an increase in the frequency of ciliary beat in the normal direction. In free-swimming specimens this is seen as an increase in the velocity of forward locomotion.
Y Naitoh; R Eckert
Related Documents :
20570656 - Identification of a voltage-gated potassium channel in gerbil hippocampal mitochondria.
15922586 - K2p channels and their protein partners.
2446246 - Nucleotide-sensitive ion channels in human insulin producing tumour cells.
8098956 - A potassium channel toxin from the secretion of the sea anemone bunodosoma granulifera....
3927046 - Tea prevents the decline of the duration of the action potential in hypoxic cardiac mus...
170106 - Influence of potassium and calcium ions on the phosphatidylinositol and phosphatidylcho...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  164     ISSN:  0036-8075     ISO Abbreviation:  Science     Publication Date:  1969 May 
Date Detail:
Created Date:  1969-06-26     Completed Date:  1969-06-26     Revised Date:  2011-12-07    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  963-5     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Avoidance Learning
Calcium / metabolism
Cell Membrane Permeability*
Potassium / metabolism
Sensory Receptor Cells
Reg. No./Substance:
7440-09-7/Potassium; 7440-70-2/Calcium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Herpesvirus in Marek's disease tumors.
Next Document:  Microvolt electric signals from fishes and the environment.