Extracellular Organic Carbon from Some Green Algae

Physiologia Plantarum - Tập 20 Số 1 - Trang 200-207 - 1967
Curt Forsberg1, ÖRn Taube1
1Institute of Physiological Botany, Uppsala, Sweden

Tóm tắt

AbstractA 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 CO2. 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 · 106 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 · 10−8μg/cell · day. For Scenedesmus the extracellular carbon was calculated to be 2–5 per cent of the cell‐bound carbon.

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Tài liệu tham khảo

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Physiologia Plantarum

Tập 20 Số 1

200-207

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