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Tonicity

Definition

noun

A state of normal firmness or functional readiness of body tissues or organs; a condition of sustained partial contraction of resting or relaxed muscles.

Tthe osmotic pressure or tension of a solution, as in the cells would swell or shrink depending on the tonicity of the environment.

A property of a solution that depends on the osmotic force exerted across the membrane as influenced by the differing concentrations of solutes in and out of the cell.


Supplement

Word origin: from the Greek “tonos” = “tone
See also: hypotonicity, hypertonicity, isotonicity.


User contributions

A sum of ions in the solution determine the tonicity. In the other term H+ ion concentration in the solution determine the tonicity.


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Re: centrifugation of hemocytes

Are you resuspending in a PBS solution isotonic to the cells? Lysis could explain why the cells aren't there. You could try slightly increasing the tonicity of the PBS - better to have crenated cells than lysed cells.

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by jonmoulton
Mon Jan 27, 2014 10:44 pm
 
Forum: Cell Biology
Topic: centrifugation of hemocytes
Replies: 5
Views: 2597

Tonicity Explanation

Tonicity is a measure of the osmotic pressure (as defined by the water potential of the two solutions) of two solutions separated by a semipermeable membrane. It is commonly used when describing the response of cells immersed ...

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by einfopedia
Wed Mar 28, 2012 7:44 am
 
Forum: Cell Biology
Topic: Tonicity Explanation
Replies: 11
Views: 28629

Re: Plant vacuole

... the cytoplasm. Thanks for that. From this I may suspect that the tonoplast is not just any lipid bilayer and that it is is more adept at handling tonicity than the plasma membrane. Exactly. it's membrane contains protein.

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by Maatomaat
Thu Nov 24, 2011 11:04 am
 
Forum: Cell Biology
Topic: Plant vacuole
Replies: 8
Views: 6812

Re: Plant vacuole

... the cytoplasm. Thanks for that. From this I may suspect that the tonoplast is not just any lipid bilayer and that it is is more adept at handling tonicity than the plasma membrane.

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by Adz795
Thu Nov 24, 2011 10:46 am
 
Forum: Cell Biology
Topic: Plant vacuole
Replies: 8
Views: 6812

Tonicity Explanation

"The elastic tension of living muscles, arteries, etc. that facilitate response to stimuli" is a definition of "tonicity".

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by Jastina13
Mon Aug 01, 2011 7:25 am
 
Forum: Cell Biology
Topic: Tonicity Explanation
Replies: 11
Views: 28629
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