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
References in periodicals archive ?
An ultrafiltrate (UF) was produced containing the low molecular mass fraction (<3kDa) of the cell culture supernatant (S) of LPS-primed U937 cells treated with CCL3 (10ng/ml) for 30 min.
Equal volumes of ultrafiltrate and control sample (300 [micro]L) were aspirated and analysed as described above.
Muniz, "Effect of a hemodiafiltration session with on-line regeneration of the ultrafiltrate on oxidative stress.
The ultrafiltrate flow rate was the sum of the dehydration rate by CVVH and the infusion rate of replacement fluid, bicarbonate-buffered fluids, citrate, and calcium.
Ninety % of P in the plasma is filtered in the glomerules and 85% of the ultrafiltrate is reabsorbed.
Saliva is a natural ultrafiltrate of blood, and steroids not bound by carrier proteins in the blood freely diffuse into saliva.
Effects on inflammatory and nutritional markers of haemodiafiltration with online regeneration of ultrafiltrate (HFR) vs online haemodiafiltration: a cross-over randomized multicentre trial.
Afterwards, the result (an ultrafiltrate with a molecular weight of <100 kDa) was measured for PRL concentration (medium and small) using the enzyme-linked immunosorbent assay, and the R% was calculated.
Ultrafiltrate and dialysate (Hemosol B0, Gambro Hospal, Basel, Switzerland) fluids were replaced in a 1: 1 ratio, and the substitution fluid was given postfilter.
The ultrafiltrate from the rhamnogalacturonan hydrolase digestion was freeze-dried.
It can be viewed as modified ultrafiltrate of plasma combined with proteins derived from kidney and urinary tract, with protein concentration approximately 1000-fold lower than in plasma itself [2].
Raising the solvent level in the bath or prewetting the substrate with ultrafiltrate has been known to help as they tend to improve substrate wetting.