ultrafiltration

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ultrafiltration

 [ul″trah-fil-tra´shun]
filtration through filters with minute pores, thus allowing the separation of extremely minute particles. It occurs naturally, as in the filtration of plasma at the capillary membrane, and is also performed clinically and in the laboratory, such as in hemodialysis, where it involves the bulk movement of solute and solvent across the membrane down pressure gradients and is usually performed under pressure to accelerate the process.

ul·tra·fil·tra·tion

(ŭl'tră-fil-trā'shŭn),
Filtration through a semipermeable membrane or any filter that separates colloid solutions from crystalloids or separates particles of different size in a colloid mixture.

ultrafiltration

/ul·tra·fil·tra·tion/ (ul″trah-fil-tra´shun) filtration through a filter capable of removing very minute (ultramicroscopic) particles.

ultrafiltration

[-filtrā′shən]
a type of filtration, sometimes conducted under pressure, through filters with very small pores, such as those used by an artificial kidney. It can separate large molecules from smaller molecules in body fluids.

ul·tra·fil·tra·tion

(ŭl'tră-fil-trā'shŭn)
Filtration through a semipermeable membrane or any filter that separates colloid solutions from crystalloids or separates particles of different size in a colloid mixture.

ultrafiltration

Filtration through a SEMIPERMEABLE MEMBRANE that allows only the passage of small molecules, such as those smaller than protein molecules.

ultrafiltration

the process by which small molecules and ions are separated from larger molecules in blood to form the INTERSTITIAL FLUID or in the kidney to form the renal filtrate.

ultrafiltration 

One of the mechanisms that produce aqueous humour from blood plasma into the ciliary epithelium of the ciliary processes. This mechanism takes advantage of the natural pressure gradient between the capillary vascular pressure and intraocular aqueous pressure, to drive fluid into the eye. Ultrafiltration is one of three physiological processes that create aqueous fluid, the others being active transport and diffusion. See ciliary body; diffusion; active transport aqueous rate of outflow humour.

ultrafiltration

filtration through a filter capable of removing colloidal particles from a dispersion medium, as in the filtration of plasma at the capillary membrane.
References in periodicals archive ?
PEGs of two MWs (20,000 and 35,000 g/mol) and BSA (67,000 g/mol) aqueous solutions of 1 g/L have been ultrafiltered under a pressure of 150 kPa.
double dagger]) Isotopes measured on ultrafiltered gelatin.
Composition, microstructure and maturation of semi-hard cheese from high protein ultrafiltered milk retentates with different levels of denatured whey protein.
Bone dates were run on ultrafiltered collagen fractions larger than 30 kiloDaltons (kD) in size.
Digestion of Emmental WSE induced an increase of the ACE inhibition as compared to undigested WSE while a 10 kDa ultrafiltered WSE lost a part of its ACE inhibitory activity after digestion process.
Bennet, Influence of danaturation and aggregation of P lactoglobulin on rennet coagulation properties of skim milk and ultrafiltered milk, Food Research International, 29, 715-721 (1996).
Physicochemical characteristics and rennet coagulation time of ultrafiltered goat milk.
MPC85 skim milk is ultrafiltered and contains very low concentrations of orotic acid, purines, and lactose.
Interestingly, late-season skim milk led to a greater increase in FEUA, compared with either ultrafiltered skim milk or early-season skim milk, suggesting that the acute urate-lowering effect of orotic acid may explain these effects.
Manufactured from fresh ultrafiltered milk, this protein offers enhanced nutrition for sportspeople.
Comparison of bifidobacterial growth promoting activity of ultrafiltered casein hydrolysate fractions.
In the OF procedure, 50 [micro]L sample was mixed with 100 [micro]L L IS working solution for 5 min, then ultrafiltered at 14 OOOg and 4 [degrees]C for 60 min in a Microcon YM-3 OF device (Millipore).