"Studies on the physiology and biochemistry of germ cells. II. Action spectrum for the photodynamic sensitization of sperm to light."; "Porterfield, I. D. (Ira Deward), 1920-", "Norman, Charles.", "Goldberg, Erwin."; "Cattle--Spermatozoa--Research."; "Norman, Charles.", "Porterfield, I. D. (Ira Deward), 1920-", "Goldberg, Erwin."; "1960"; "Journal article reprint from: The Anatomical Record, v.137:no.3 (1960:July). \"Introduced by Leland H. Taylor.\""; ""; "P8894"; "pec"; "Cattle--Spermatozoa--Research."; "14256"; .