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Membrane

Definition

noun, plural: membranes

(1) (biology) A thin layer of tissue covering a surface or lining a cavity, space or organ.

(2) (biology) A cell membrane.

(3) (chemistry) A thin pliable sheet of material that is permeable to substances in solution.


Supplement

A biological membrane functions by protecting the surface or bodily organ. It acts as a barrier against injurious substances. It also acts as a film or covering separating two regions. It may also connect structures or organs of an animal or a plant.


Word origin: Latin membrāna, skin, from membrum, member of the body.

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Questions about DNA dialysis

... in the gizmo if you have small volumes, and perhaps a tad stuck in the pores. It should work by simply allowing the ions to diffuse across the membrane so that the initial volume becomes the final volume, and the salts are diluted proportionately. Like, V1/V2 * inititial salt conc. If you want ...

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by biomart
Wed Mar 11, 2015 7:43 am
 
Forum: Bioinformatics
Topic: Questions about DNA dialysis
Replies: 1
Views: 284

Main Factors that Affect Clinical Consequence of Toxicity

... differences in species may also affect the likelihood of toxicosis. Age and size of the animal are primary factors affecting toxicosis, as membrane permeability and hepatic and renal clearance capabilities vary with age, species, and health. And Nutritional and dietary factors, hormonal ...

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by 2444256703
Thu Jan 29, 2015 7:30 am
 
Forum: Molecular Biology
Topic: Main Factors that Affect Clinical Consequence of Toxicity
Replies: 0
Views: 258

I have got some BIG issues! forgive the long post

... in transplantations. Some alleles have also been shown to be associated with, mostly autoimmune, diseases. MHC class II molecules are integral membrane glycoproteins consisting of a heavy chain with a molecular weight of approximately 34000 and a lighter chain with a molecular weight of approximately ...

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by saddy51
Sun Jan 04, 2015 10:39 am
 
Forum: Genetics
Topic: I have got some BIG issues! forgive the long post
Replies: 1
Views: 1768

Re: Beginner Microbiologist, looking for a place to start.

... In particular, look into: pH, atomic and molecular structure, biological macromolecules and their subunits, glycolysis and Krebs cycle, membranes and membrane potential, transmembrane signaling, gene expression and its control, protein structure, mechanisms of protein catalysis, synthetic ...

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by jonmoulton
Mon Dec 15, 2014 5:33 pm
 
Forum: General Discussion
Topic: Beginner Microbiologist, looking for a place to start.
Replies: 1
Views: 1076

Depolarization = ion channel opening?

Hi huys, I have a problem with this statement: "Action potentials are formed when a stimulus causes the cell membrane to depolarize past the threshold of excitation, causing all sodium ion channels to open." Isn't the cell membrane depolarized BECAUSE the ion channels ...

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by autumnsphere
Wed Oct 29, 2014 2:18 pm
 
Forum: Cell Biology
Topic: Depolarization = ion channel opening?
Replies: 1
Views: 655
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