| Autor: |
Canelli, Edmondo, Fuhs, G. Wolfgang |
| Předmět: |
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| Zdroj: |
Journal of Phycology; Mar1976, Vol. 12 Issue 1, p93-99, 7p |
| Abstrakt: |
The effect of the sinking rate, or rate of medium flow (φ) on the role of phosphate incorporation (V) by the planklonic diatoms Thalassiosira fluviatilis Hust. and T. pseudonana Hasle & Hcimdal in batch and chemostal cultures was determined by passing medium at defined flow rates (0.5-25.0 mm · min[SUP-1]) over algae on membrane fillers. At concentrations from 1 to 100 μg phosphorus · I[[SUP-1] I[SUP1], increases with increasing velocity of flow, approaching a maximum value (V[SUBm]) as described by the empirical relationship: v: v[SUB, (φ/φ + K[SUBφ]) + V[SUB0] where K[SUBφ] is the sinking rate value when V = ½ V[SUBm] + V[SUB0] and V[SUB0] is the uptake at 0 rate of flow. By comparing uptake at controlled flow with uptake in a vigorously stirred medium, the phosphate concentration in the cell boundary layer can be determined. The sinking rate that reduces the phoosphale concentration in the boundary layer to half of nominal concentration, in the medium is much lower for the larger T. fluviatilis than for T. pseudonana. For both diatoms, it is inversely related to the nominal concentration. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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