Growth and Chemical Composition of the Blue-Green Alga Anacystis Nidulans Cultured at High Light Intensities*

Abstract

273The influence of temperature, CO 2 availability, light intensity, and colour on growth of Anacystis at high (70-120 W'm-2 ) light intensities was investigated. In the first 2~days rapid formation of cells with a high nitrogen content was found. During this period the nitrogen content of the cells was about 10%. When the supply of bound nitrogen was exhausted, the over-all photosynthetic mechanism switched to production of nitrogen deficient products, probably carbohydrates. Only in the first period growth could be followed by measuring optical parameters, and a production of 0.5-\ gl -1 dry weight per day could be obtained in single batch as well as in continuous cultures.

Growth measurements by monitoring light scattering of a filamentous blue‐green alga which does not give uniform and stable suspension in culture vessels

“…Experiments were designed to make stable suspension of the organism and the results on the scattering and spectral studies were compared with that of Nicrocystis sp. which normally gives a uniform and stable suspension in culture vessels.Reports are also available on measurement of growth rate of blue-green algae and other photosynthetic microorganisms by monitoring optical density of microbiol suspension a t the wavelengths of 600-610 (CRIPPS and WORK 1967, JEFFERY et al 1973, MYERS 1962, SAMEJIMA and MYERS 1958, 640 (KHAN and SEN 1967), 620-700 (DAS and SINGH 1975) where the interference by pigment absorption in scattering values 32. …”

“…Reports are also available on measurement of growth rate of blue-green algae and other photosynthetic microorganisms by monitoring optical density of microbiol suspension a t the wavelengths of 600-610 (CRIPPS and WORK 1967, JEFFERY et al 1973, MYERS 1962, SAMEJIMA and MYERS 1958, 640 (KHAN and SEN 1967), 620-700 (DAS and SINGH 1975) where the interference by pigment absorption in scattering values…”