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 ?
Each sample was added to 2 mL of 6% formalin in ultrafiltered seawater containing a known concentration of fluorescent microbeads (Fluoresbrite YG Microspheres, 2.
We also obtained new ultrafiltered bone dates from the site and these can be compared with the charcoal ABOx-SC series.
Brown, Calcium Phosphate Saturation Levels in Ultrafiltered Serum, Calcif.
For the determination of free sugar, 2 ml of a 2 g/L sample solution was ultrafiltered through Centrisalt I (Sartorius AG-W-3400, Goettingen, Germany; molecular mass cut off = 10,000).
Samples were ultrafiltered until 25%, 50%, or 75% of the aqueous solution had passed through the membrane, using a separate device for each analyte and percentage.
2% Tetrahydrofuran Anhydrous Water Deionized, ultrafiltered Chemical Source Acetone Fisher Acetonitrile EM Industries Cyclohexane Fisher Diethyl Carbonate EM Industries Dimethyl Carbonate EM Industries N-N-Dimethylformamide Aldrich Dimethyl Sulfoxide Fisher Ethanol Aldrich Ethylene Carbonate EM Industries Lithium Hydroxide Fisher Methanol Fisher Nitric Acid Fisher N-methylpyrrolidinone Fisher Phosphorous Pentoxide Fisher Propylene Carbonate EM Industries Sulfuric Acid Fisher Tetrahydrofuran Acros Water Fisher Table 2 Solvent Properties (40-42).
Used' is the amount of bone pre-treated and the yield represents the weight of gelatin or ultrafiltered gelatin in milligrams.
We ultrafiltered large volumes of serum (up to 50 mL) under 20 psi nitrogen gas pressure at 37 [degrees]C using a stirred ultrafiltration device with a regenerated cellulose membrane that has a nominal molecular weight cutoff of 12 to 14 kDa (Millipore).
1%) was ultrafiltered using a Labscale TFF system (Millipore, Bioprocess Division; Milan, Italy) equipped with three ultrafiltration (UF) membranes (type Pellicon XL, mod.
The radiocarbon determinations are of ultrafiltered gelatin extracted from the bones using the methods outlined by Brook Ramsey et al.
To assess the extraction procedure, we subjected untreated and ultrafiltered seminal plasma (a rich source of proCNP) to gel-filtration chromatography.