semipermeable


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to semipermeable: semipermeable membrane

semipermeable

 [sem″e-per´me-ah-bl]
permitting passage only of certain molecules.

sem·i·per·me·a·ble

(sem'ē-per'mē-ă-bĕl),
Freely permeable to water (or other solvent) but relatively impermeable to solutes. Depending on the context, it has been used to imply impermeability to all solutes except very small uncharged molecules (for example, a cell membrane), or merely impermeability to very large molecules such as proteins (for example, a capillary membrane).

semipermeable

(sĕm′ē-pûr′mē-ə-bəl, sĕm′ī-)
adj.
1. Partially permeable.
2. Allowing passage of certain, especially small, molecules or ions but acting as a barrier to others. Used of biological and synthetic membranes.

sem′i·per′me·a·bil′i·ty n.

sem·i·per·me·a·ble

(sem'ē-pĕr'mē-ă-bĕl)
Freely permeable to water (or other solvent) but relatively impermeable to solutes.

semipermeable

Able to allow the passage of molecules below a certain size and to retain those above this size. Much of PHYSIOLOGY depends on the semipermeability of body membranes.

sem·i·per·me·a·ble

(sem'ē-pĕr'mē-ă-bĕl)
Freely permeable to water (or other solvent) but relatively impermeable to solutes.
References in periodicals archive ?
Rather than launch a large-scale field survey, we used semipermeable membrane devices (SPMDs) to determine the types of chemicals potentially bioavailable to fish in the area.
Note that since no PEG can diffuse into the pores of the samples owing to the presence of the semipermeable membrane, mmol [L.sup.-1] means mmol per liter of synthetic pore water without PEG.
The semipermeable membrane allows diffusion of water molecules but prevents diffusion of solutes.
SEOPT was stripped of the semipermeable membrane and the core tablet was placed in volumetric flask containing 100 ml distilled water.
Use a vapor semipermeable rigid foam insulation that water does not damage to replace the foil reflective insulation vapor barrier (Photo 3).
According to a report in New Scientist, Bruce Logan, an electrical engineer at Pennsylvania State University in University Park, and colleagues at Tsinghua University in Beijing, China, adapted one of these techniques, electrodialysis, in which electricity draws ions from salt water through semipermeable membranes into two chambers.
The blood-brain barrier is a semipermeable molecular "wall" that controls the passage of substances from the bloodstream into the brain.
Free T has been estimated for some time by dialyzing serum across a semipermeable membrane under selected conditions.
Many desalination plants force water through semipermeable membranes to reduce salts and contaminants.
One method uses gas diffusion through a semipermeable membrane.
Edible films and coatings may extend the shelf life of fresh-cut produce by providing a semipermeable barrier to gases and water vapor.
Necessary elements include a semipermeable membrane, dialysate solution, and a surgically created access.