A (mixture) separation methodology that uses the ability of synthetic semipermeable membranes (possessing appropriate physical and chemical natures) to discriminate between molecules in the mixture, primarily on the basis of the molecules’ size/shape. Invented and developed by Dr. Roy J. Taylor in the 1950s and 1960s, ultrafiltration is typically utilized for the separation of relatively high-molecular-weight solutes (e.g., proteins, gums, polymers and other complex organic molecules) and colloidally dispersed substances (e.g., minerals, microorganisms, etc.) from their solvents (e.g., water).
The process of filtering the blood to remove tiny particles, e.g. when the blood is filtered by the kidney.
Filtration under pressure. In the kidney, blood is subjected to ultrafiltration to remove the unwanted water, urea, and other waste material that goes to make up urine.
Filtration carried out under pressure. Blood undergoes ultrafiltration in the kidneys to remove the waste products, urea and surplus water that constitute urine.
Filtration of a colloidal substance in which the dispersed particles, but not the liquid, are held back.