title: In memoriam Jacob Levitt.
authors.affiliation: Department of Agriculture, Ottawa, Ontario, Canada.
authors.forename: D
authors.initials: D
authors.lastname: Siminovitch
mesh_terms: D001901:Botany / Q000266:history*; D005615:Freezing; D049673:History, 20th Century; D018521:Plant Physiological Phenomena