Productivity and photosynthetic efficiency ofSpirulina platensis as affected by light intensity, algal density and rate of mixing in a flat plate photobioreactor

The Enhancement of Photosynthesis by Fluctuating Light

“…This phenomenon causes a dramatic decrease in light utilization efficiency since the photons cannot penetrate into the depth of the culture, even when enough photons are supplied at the surface. Many photobioreactors have been developed to overcome this problem (Park & Lee, 2000;Qiang & Richmond, 1996;Richmond et al, 2003). Much recent research effort has been devoted to finding a means for shifting the group of cells exposed to the light in such a manner that each cell will receive just its quanta of light and then will immediately be replaced by another one, so that none of the light will be wasted (Richmond, 2004).…”

Characterization of cell growth and starch production in the marine green microalga Tetraselmis subcordiformis under extracellular phosphorus-deprived and sequentially phosphorus-replete conditions

“…Generally, under a specific light intensity, lower cell density will allow more irradiance per unit cell, which facilitates starch accumulation (Brányiková et al 2011). However, in terms of photosynthetic efficiency and biomass productivity, an optimal cell density is required (Hu and Richmond 1994;Hu and Richmond 1996). In batch cultivation mode, initial cell density (ICD), which denotes the inoculum size, can be used to regulate cell density and hence optimize biomass and starch production under stressed conditions, especially under extracellular deprivation of any specific nutrient of which there can be large intracellular stores.…”

Extracellular Polymeric Substance (EPS) Production by <i>Nostoc minutum</i> under Different Laboratory Conditions

“…However, for still cultures the light intensity showed a slight incidence. Different authors reported the importance to consider this parameter because it is often found as a limiting factor in culture systems [19] [20]. The efficient air-lift stirring of the glass columns plays a crucial rol for reducing shading between cells, thus allowing to obtain higher values of biomass than in still cultures.…”