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Plant Physiology 50:375-377 (1972) © 1972 American Society of Plant Biologists Photophosphorylation and Carbon Dioxide Fixation by Chloroplasts Isolated from Populus deltoides1a Department of Forest Botany and Pathology, State University of New York College of Forestry, Syracuse, New York 13210
A system has been developed for the isolation of photosynthetically active chloroplasts from leaves of Populus deltoides. A high proportion of the chloroplasts appeared intact. The maximum rates of different photosynthetic processes were as follows: CO2 fixation 3.5 micromoles per milligram chlorophyll per hour, noncyclic ATP synthesis 10 micromoles per milligram chlorophyll per hour, and cyclic ATP synthesis 300 micromoles per milligram chlorophyll per hour.
2 Present address: Facultad de Ciencias Forestales, Universidad de los Andes, Mérida, Venezuela. 1 This paper is taken from the Ph.D. thesis of R. Hernández-Gil.
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