THE GROWTH OF SOME GREEN-ALGAE (SCENEDESMUS, CHLORELLA, BOTRYOCOCCUS,ULVA) - PHYSIOLOGY AND BIOCHEMISTRY

In this paper we present the results of study the evolution of some gr een algae in different types of bioreactors in order to obtain large q uantities of biomass. We have found out that genera Chlorella and Scen edesmus are more active in the bioreactor with air injection in algal suspension. In the case of Botryococcus braunii, the photosynthetic ac tivity and biomass accumulation are growing as immobilisation of cells in the alginate. Regarding the tested algae, as far as economic impor tance is concerned, we have reached the conclusion that Botryococcus h as a lower proteinaceous and glucosidic content in the cell-lines with many hydrocarbons. Besides the determination of certain doses and the optimum N/P relations, we have correlated the role of some microeleme nts (Al, Zn, Cu, Ni) in the process of algal growth and development. T he culture of Ulva rigida on solid media has shown the ombrophylus cha racter of this species under the conditions of natural and fluorescent light and mineral and organic nutrition (1. optimum development under 10000 lx., 2. optimum development in folded explants; 3. a slight ten dency of immersion in an Solid agar medium of explants).