14C-labeling of the compounds excreted by phytoplankton for employment as a realistic tracer in secondary productivity measurements |
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Authors: | W. J. Wiebe D. F. Smith |
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Affiliation: | (1) Division of Fisheries and Oceanography, C.S.I.R.O., 2230 Cronulla, N.S.W., Australia;(2) Present address: Department of Microbiology, University of Georgia, 30602 Athens, Georgia |
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Abstract: | Preparations of the dissolved organic compounds released by photosynthesizing marine phytoplankton have been obtained with14carbon activities as high as 1.5 × 105 dpm/ml. The radioisotope content of the preparations resides wholly in dissolved organic compounds of low molecular weight (MW<3500), which are uncontaminated by residual14C-labeled inorganic carbon. The labeled compunds arise through photosynthetic fixation and do not appear to be products of cell lysis during the incubation or to originate from cell damage during the filtration step employed. |
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