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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.
Farlex Partner Medical Dictionary © Farlex 2012

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ultrafiltration

Filtration through a SEMIPERMEABLE MEMBRANE that allows only the passage of small molecules, such as those smaller than protein molecules.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann