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RESPIRATION CORRECTIONS FOR BACTERIAL UPTAKE OF DISSOLVED ORGANIC COMPOUNDS IN NATURAL WATERS 1
Author(s) -
Hobbie John E.,
Crawford Claude C.
Publication year - 1969
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1969.14.4.0528
Subject(s) - microorganism , environmental chemistry , heterotroph , respiration , chemistry , incubation , flux (metallurgy) , nitrogen , dissolved organic carbon , liquid scintillation counting , bacteria , environmental science , chromatography , biology , botany , organic chemistry , biochemistry , genetics
The uptake of 14 C‐labeled organic compounds has been used by many workers to study heterotrophic microorganisms in natural waters. However, if flux rates of organic compounds are to be measured, the loss of 14 CO 2 during incubation becomes an important source of error. A method is proposed in which the experiment is run in a closed system and the 14 CO 2 collected after killing and acidification. Phenethylamine on chromatographic paper is the absorbing agent and the paper is counted by liquid scintillation. Studies of 19 compounds from pond water showed that 60% (aspartic acid) to 8% (arginine) of the labeled material entering the microorganisms was respired.