title: THE PREPARATION OF A GRADED SERIES OF ULTRAFILTERS AND MEASUREMENT OF THEIR PORE SIZES.
abstract: A simple procedure for making a series of membranes of graded pore sizes is presented with data for permeability of the membrane series to water and to colloidal sols of known particle sizes. A convenient ultrafiltration apparatus for operation under aseptic conditions is described.
authors.affiliation: Department of Bacteriology and Experimental Pathology, Stanford University, California.
authors.forename: A P
authors.initials: AP
authors.lastname: Krueger
authors.forename: R C
authors.initials: RC
authors.lastname: Ritter