ultrafiltrationn.

1908 Chem. Abstr. 2 1155 Ultrafiltration... Filtration of this type is accomplished by forcing under pressure the solutions through colloid membranes such as collodium, glacial acetic acid-collodium and hardened gelatin.

1946 Nature 9 Nov. 665/2 The blood pressure reduction cannot have augmented the osmotic pressure by more than..about 3·2/1000 of the total osmotic pressure. This change is so small that ultra-filtration cannot play any considerable part in the formation of aqueous humor.

1959 New Scientist 15 Jan. 135/3 Most marine animals possess some type of ampullary excretory organ... It is probable..that these organs produce an excretory fluid by a process of ultrafiltration.

1964 G. S. Wilson & A. A. Miles Princ. Bacteriol. & Immunity (ed. 5) i. xl. 1166 In estimating the size of virus particles ultrafiltration through Gradocol membranes is widely used.

1978 Sci. Amer. July 88/2 The pores of an ultrafiltration membrane are on the scale of 10⁻⁹ meter, or one nanometer; average pore diameters range from less than a nanometer to about 10 nanometers.

1908 Chem. Abstr. 2 3183 (heading) Porosity of ultra filters.

1911 Chem. Abstr. 5 2 Ultrafiltration... A discussion of the merits of the Bechhold and Burian ultrafilters and of the author's modifications.

1920 Biochem. Jrnl. 14 539 The oxygenase remains on the ultrafilter.

1946 Physiol. Rev. 26 586 The first indication that the adrenotrophic factor could be ultrafiltered was presented..in 1934.

1961 Lancet 5 Aug. 284/2 The plasma was ultrafiltered.

1974 Nature 8 Nov. 176/1 The haemagglutinating activity in galactose..was found in the retentate and could be concentrated quantitatively and washed free of monosaccharide by ultrafiltration over an XM-50 ultrafilter (Amicon) which nominally retains proteins of molecular weight greater than 50,000.

1978 Nature 2 Mar. 65/2 The supernatant was ultrafiltered twice..to separate the proteins into three fractions with molecular weights..above 50,000, between 10,000 and 50,000 and below 10,000.

1928 Biochem. Jrnl. 22 633 A large proportion of the inorganic phosphate of the plasma is ultrafilterable through cellophane.

1976 Nature 8 Apr. 487/1 The rise in brain tryptophan..correlates..with the fraction of tryptophan which is not protein bound (free or ultrafilterable).