title: The relationship between the lifetime and yield of the 735 nm fluorescence of chloroplasts at low temperatures.
abstract: The lifetime and relative yield of the 735 nm fluorescence of chloroplasts, over a range of low temperatures (-60 to -196 degrees C) where the yield of fluorescence changes markedly, were found to be directly proportional. It is concluded that the species of chlorophyll responsible for the 735 nm fluorescence, C-705, is present over the entire temperature range but is less fluorescent at the higher temperatures because of greater energy transfer to P-700. It is also concluded from attempts to measure the rise-time of the 735 nm fluorescence at -196 degrees C that the rise-time is less than 50 ps.
mesh_terms: D002734:Chlorophyll / Q000502:physiology; D002736:Chloroplasts / Q000502:physiology*; D003080:Cold Temperature; D007887:Fabaceae; D005453:Fluorescence; D007700:Kinetics; D010084:Oxidation-Reduction; D010788:Photosynthesis; D010946:Plants, Medicinal
chemical_list: D002734:Chlorophyll