06-14-2007, 05:04 PM
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#2
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Admin/ Super mod
Join Date: Aug 2003
Location: New Castle, Delaware
Posts: 20,364
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here is a section on them
Quote:
2.3.1.5. Temperature
The optimal temperature for phytoplankton cultures is generally between 20 and 24°C, although this may vary with the composition of the culture medium, the species and strain cultured. Most commonly cultured species of micro-algae tolerate temperatures between 16 and 27°C. Temperatures lower than 16°C will slow down growth, whereas those higher than 35°C are lethal for a number of species. If necessary, algal cultures can be cooled by a flow of cold water over the surface of the culture vessel or by controlling the air temperature with refrigerated air - conditioning units.
2.3.1.6. Salinity
Marine phytoplankton are extremely tolerant to changes in salinity. Most species grow best at a salinity that is slightly lower than that of their native habitat, which is obtained by diluting sea water with tap water. Salinities of 20-24 g.l-1 have been found to be optimal.
2.3.2. Growth dynamics
The growth of an axenic culture of micro-algae is characterized by five phases (Fig. 2.3.):
· lag or induction phase This phase, during which little increase in cell density occurs, is relatively long when an algal culture is transferred from a plate to liquid culture. Cultures inoculated with exponentially growing algae have short lag phases, which can seriously reduce the time required for upscaling. The lag in growth is attributed to the physiological adaptation of the cell metabolism to growth, such as the increase of the levels of enzymes and metabolites involved in cell division and carbon fixation.
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Tim
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