Dictionary » P » Permeable




Capable of being permeated or passed through, used especially of substances where fluids can penetrate or pass through.


For example, wood is permeable to oil.

Word origin: LL permeābilis, equiv. to permeā(re) to permeate
Related forms: permeability (noun).

Compare: impermeable

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plasmodesm and gap junction

The answer I found is that plant cell walls are not permeable to big proteins (more than 30-60 kDa), so they must be passed by plasmodesmata (with 20-40 nm diameter). As a result, every plant cell needs plasmodesmata but animal cells haven't any barrier ...

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by mnatashgaran
Mon Apr 01, 2013 7:46 pm
Forum: Cell Biology
Topic: plasmodesm and gap junction
Replies: 1
Views: 2002

Speed of Osmosis

i have learned about the osmosis in the lab how water particles move from a high concentration to a low concentration through the permeable membrane. however there is one question that i do not know. my question is why the rate of osmosis changes as concentration of the NaCl changes. i ...

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by youcandoit722
Sat Oct 06, 2012 12:56 am
Forum: Cell Biology
Topic: Speed of Osmosis
Replies: 1
Views: 2547

what is the relationship between hemolysis & molecular weigh

... also i know that an increase in molecular weight is related to an increase in the size of the molecule and the larger the molecule the less permeable the membrane is to that molecule, so does that mean that as the molecular weight increases, the less permeable the membrane becomes and therefore ...

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by Fa23
Sat Sep 22, 2012 11:35 pm
Forum: Physiology
Topic: what is the relationship between hemolysis & molecular weigh
Replies: 1
Views: 3660

Need help with Plasma Membrane

... of a phospholipid bilayer. Has some protein as well as cholesterol. And I think some carbohydrates (is that true?) The Plasma membrane is semi-permeable (selective). It lets some things in and keeps some things out. The major function is to protect the cell and transport of substances/molecules. ...

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by MissionCO
Sun Mar 04, 2012 1:18 am
Forum: Cell Biology
Topic: Need help with Plasma Membrane
Replies: 4
Views: 8020

Protein movment in cell membrane?

Actually I just have one last question: Why are cell membranes permeable to non-polar molecules and relatively impermeable to polar molecules?

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by aic92
Tue Dec 13, 2011 5:45 pm
Forum: General Discussion
Topic: Protein movment in cell membrane?
Replies: 4
Views: 3505
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