Abstract: An anticancer agent extracted and isolated from chlorella is disclosed. This anticancer agent is a kind of glycoprotein having an average molecular weight of 4.5.times.10.sup.4, of which protein moiety consists of .alpha.-helix and random coil, sugar moiety consists of .beta.-polysaccharide, and circulor dichroism spectrum has a positive peak at 275 nm.

Abstract: A testing agent for neutrophil function includes a substance having a molecular weight of 5,000 or more. The substance is contained in an extract extracted from chlorella alga using an aqueous solvent. The agent activates neutrophils specifically.

Abstract: A method of culture of human cells is disclosed which comprises effecting the cultivation in a culture medium containing an extract of micro algae, such as Chlorella, Scenedesmus or Spirulina, said method permitting the normal successive cultivation of human cells to be maintained efficiently without any morphological and genetic mutations over a greater number of successive of generations than has hitherto been possible even by the incorporation of animal serum in the culture medium, even when the addition amount of such animal serum is reduced substantially or animal serum is completely excluded.

Abstract: In a plant tissue and cell cultivation, a method for facilitating both cell multiplication and differentiation is attained by conducting the cultivation in a culture medium containing an extract of micro algae such as Chlorella, Scenedesmus and Spirulina.

Abstract: A chlorella-culturing apparatus comprises a rotatable arm body fitted with a stirring mechanism for forcefully producing stirring streams by stirring blades and scraping mechanism. The scraping mechanism is so mounted on the rotatable arm body as to slide up and down. It is brought down when the chlorella-culturing apparatus discharges cultured chlorella, and rotated with the arm body in contact with a bottom board and inner peripheral surface of a chlorella-culturing tank. At least one chlorella-discharging groove is formed in the bottom board of the chlorella-culturing tank. Deposits removed by the scraping mechanism are carried together with a chlorella-culturing liquid into the discharging groove by the scraping mechanism. The central pillar and side wall of the chlorella-culturing tank have an inclined surface which is sprayed with water to prevent cultured chlorella and any other material from being deposited on said surface.