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Investigation of the photosynthetic productivity and efficiency of utilization of light energy of Chlorella as a function of the energy spectral distribution in an equi-energetic light field



Investigation of the photosynthetic productivity and efficiency of utilization of light energy of Chlorella as a function of the energy spectral distribution in an equi-energetic light field



Fiziol Rast 13(6): 949-957



In a Chlorella suspension cultivated over a long period of time, growth and development rates, photosynthetic productivity, and efficiency of radiant energy utiliza-tion increased, while the amount of N-containing substances decreased when the spectral composition of the light was varied in such a way as to increase the relative amount of long-wave photosynthetically-ac-tive radiation (PhAR). The highest productivity and energy efficiency were observed when 80% of the radiation was in the region between 610 and 710 m[mu], 7.5% in the 380-535 m[mu] region, and 12.5% in the 535-610 m[mu] region. The increase of the energy efficiency and photosynthetic productivity of the Chlorella culture observed on redistributing the energy from the short-wave to long-wave length of PhAR in an equi-energy light field strictly depended on the quantum density and was determined by the increase of the number of photons per unit energy which occurred with increase of the wave length. This may signify that for the spectral distributions employed in the present study no photocatalytic systems restrict algal growth and development of productivity, which are thus completely determined by the process of photosynthesis.

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