Dictionary » I » Impermeable

Impermeable

Definition

adjective

(1) Not permeable or passable.

(2) Of, or pertaining to, a substance not allowing passage or passing through of a fluid.


Supplement

Word origin: From Latin impermeabilis.
Related forms: impermeability (noun).


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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: 2916

Apoplast, Symplast

... the endodermis, there is the 'apoplast block' - the cellulose cell walls of the cells of the endodermis have a substance called suberin which is impermeable and prevents the movement of water. The suberin makes up what is called the Casparian strip. At this point, all the water has to move into ...

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by magicsiew
Thu Jun 30, 2011 7:19 am
 
Forum: Cell Biology
Topic: Apoplast, Symplast
Replies: 1
Views: 8298

Loop of Henle and Vasa Recta

... osmolarity of the interstitial fluids in the renal medulla (so it gets concentrated and stays that way). In the ascending loop the membrane is impermeable so water cannot get in, but there is an active reabsorption of ions like Na+, K+ and Cl- meaning that the solution gets steadily more dilute ...

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by Babybel56
Wed May 11, 2011 6:07 pm
 
Forum: Human Biology
Topic: Loop of Henle and Vasa Recta
Replies: 3
Views: 12228

Loop of Henle and Vasa Recta

... in the medulla of the kidney for the collecting ducts later. On the ascending loop very little water is allowed back in because the walls are impermeable, so the high concentration of solutes in the Loop is maintained despite the increasing concentration of water in the interstitial space ...

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by Babybel56
Sat May 07, 2011 3:06 pm
 
Forum: Human Biology
Topic: Loop of Henle and Vasa Recta
Replies: 3
Views: 12228

Emission Intensity Profiles

... mitochondria, it passes easily into the matrix. There, mitochondrial esterases cleave off the lipid group (AM), yielding BCECF which is membrane-impermeable and consequently trapped in the matrix. The effect of pH on the emission intensity of BCECF is shown in the figure below. (i) Vesicles containing ...

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by niravana21
Wed May 04, 2011 8:51 pm
 
Forum: Cell Biology
Topic: Emission Intensity Profiles
Replies: 1
Views: 2131
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