A thin, flexible solid that can pass small molecules such as water but not larger molecules such as sugar or alcohol.
Typically a thin, organic film which allows the passage of some ions or materials while preventing the passage of others. Some membranes will only allow the passage of cations. (See electrodialysis.) Some membranes reject most dissolved substances, but allow the passage of water. (See reverse osmosis.)
a membrane that allows small molecules such as water to pass through the membrane, but preventing large molecules such as sucrose from passing through.
A membrane that allows some particles to pass through, but not others.
A membrane that allows the passage of only some components of a solution
A material through which only certain particles may pass, and through which other particles will not pass. Dialyzers are semipermeable membranes.
a physical barrier which only allows certain particles (based on size and charge) to pass through it; membranes of organelles and cells are semipermeable membranes through which small, uncharged molecules such as water, oxygen and carbon dioxide pass freely.
a membrane that will pass some atoms or molecules but not others
a particular membrane this will pass a little atoms or else molecules yet not others
a thin layer of material capable of separating substances when a driving force is applied across the membrane
limits the flow between inside and outside of the neuron. Water, oxygen, urea, carbon dioxide flow freely. Other substances flow poorly or not at all. A few important ions potassium, chloride, and sodium, cross the membrane through gates (or pores) in specialized proteins embedded in the membrane.
film permeable only to small or specific molecules
A membrane that allows some but not all of the components in a mixture to pass through it. Semipermeable membranes are used in dialysis.
A semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a membrane which will allow certain molecules or ions to pass through it by diffusion and occasionally specialised "facilitated diffusion". The rate of passage depends on the pressure, concentration and temperature of the molecules or solutes on either side, as well as the permeability of the membrane to each solute Depending on the membrane and the solute, permeability may depend on solute size, solubility properties, or chemistry. An example of a semi-permeable membrane is a lipid bilayer, on which is based the plasma membrane that surrounds all biological cells.
