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Extracellular Organic Carbon from Some Green Algae
Author(s) -
Forsberg Curt,
Taube ÖRn
Publication year - 1967
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1967.tb07155.x
Subject(s) - total organic carbon , scenedesmus , extracellular , algae , carbon fibers , excretion , chemistry , green algae , botany , organic matter , chlorophyceae , chlorophyta , environmental chemistry , biology , food science , biochemistry , organic chemistry , materials science , composite number , composite material
A preliminary study of the extracellular organic carbon in cultures of Ankistro desmus falcatus, Scenedesmus quadricauda, Chlorella pyrenotdosa and Crucigenia tetrapedia have been performed. Carbon analyses, parallel to the increase in cell numbers, were made with an infrared analyzer after oxidation of the organic carbon to CO 2 . During the phase of declining relative growth rate and the stationary phase of growth the species excreted organic carbon. For Scenedesmus and Ankistrodesmus an uptake period took place before the excretion period. Approximately 500 · 10 6 cells/1 were required until excretion started for the former species. The highest figures for the organic carbon liberated by the four species ranged between 3 and 9 mg/l (approx. 8–23 mg organic matter/I). When distributed per cell the extracellular carbon corresponded to 1–3 μg · 10 −6 with a mean for the average excretion for the species tested of 6 · 10 −8 μg/cell · day. For Scenedesmus the extracellular carbon was calculated to be 2–5 per cent of the cell‐bound carbon.