Barbour, Margaret MHanson, David TBickford, Christopher PPowers, HeathMcDowell, Nate GFarquhar, Graham2015-12-100140-7791http://hdl.handle.net/1885/39687The oxygen isotope composition of CO2 respired by Ricinus communis leaves (Δ18OR) was measured under non-steady-state conditions with a temporal resolution of 3 min using a tunable diode laser (TDL) absorption spectrometer coupled to a portable gas exchaKeywords: carbon dioxide; oxygen; carbon dioxide; chloroplast; environmental conditions; gas exchange; isotopic analysis; laser method; measurement method; oxygen isotope; spectrometer; temporal variation; article; biological model; evaluation; metabolism; methodol Leaf respiration; Leaf water enrichment; Oxygen isotope; Tunable diode laser200710.1111/j.1365-3040.2007.01633.x2015-12-09