title: Circumnutations:  from Darwin to space flights.
authors.affiliation: Gravitational Plant Physiology Laboratory, University City Science Center, Philadelphia, Pennsylvania 19104-3323.
authors.forename: A H
authors.initials: AH
authors.lastname: Brown
mesh_terms: D002498:Centrifugation; D006112:Gravitation; D018522:Gravitropism / Q000502:physiology; D018471:Hypergravity; D018472:Hypogravity; D059828:Plant Cells; D063245:Plant Development; D018521:Plant Physiological Phenomena; D012399:Rotation; D018523:Tropism / Q000502:physiology*