Abstract: In a step of producing a powder product of the alga belonging to the genus Dunaliella, a pH adjusting step is included in which an alga belonging to the genus Dunaliella is allowed to be in a basic state of pH 9.5 or higher. According to the method, it is possible to provide dried Dunaliella powder containing ?-carotene at a high content by suppressing degradation of ?-carotene as an active ingredient while decreasing each of the total pheophorbide amount and the existing pheophorbide amount to a predetermined value or less, even if the total pheophorbide amount and the existing pheophorbide amount of the cultured algae belonging to the genus Dunaliella are higher in summer.

Abstract: In a step of producing a powder product of the alga belonging to the genus Dunaliella, a pH adjusting step is included in which an alga belonging to the genus Dunaliella is allowed to be in a basic state of pH 9.5 or higher. According to the method, it is possible to provide dried Dunaliella powder containing ?-carotene at a high content by suppressing degradation of ?-carotene as an active ingredient while decreasing each of the total pheophorbide amount and the existing pheophorbide amount to a predetermined value or less, even if the total pheophorbide amount and the existing pheophorbide amount of the cultured algae belonging to the genus Dunaliella are higher in summer.

Abstract: A preparation comprising the carotenoids phytoene and phytofluene in an amount which, in combination, is effective in preventing various kinds of damage resulting from oxidation and exposure to UV light is provided. The preparation is essentially colorless and may be used as a topical cosmetic or pharmaceutical preparation as well as an additive in food preparations. In addition, a method for producing substantive amounts of phytoene and phytofluene from carotenoid producing organisms is described as well.

Abstract: A preparation comprising the carotenoids phytoene and phytofluene in an amount which, in combination, is effective in preventing various kinds of damage resulting from oxidation and exposure to UV light is provided. The preparation is essentially colorless and may be used as a topical cosmetic or pharmaceutical preparation as well as an additive in food preparations. In addition, a method for producing substantive amounts of phytoene and phytofluene from carotenoid producing organisms is described as well.

Abstract: A preparation comprising the carotenoids phytoene and phytofluene in an amount which, in combination, is effective in preventing various kinds of damage resulting from oxidation and exposure to UV light is provided. The preparation is essentially colorless and may be used as a topical cosmetic or pharmaceutical preparation as well as an additive in food preparations. In addition, a method for producing substantive amounts of phytoene and phytofluene from carotenoid producing organisms is described as well.

Abstract: A method of protecting a mammal from the detrimental effects of irradiation is disclosed. The method comprises administering an effective amount of a substantially crude Dunaliella algae preparation to the mammal.

Abstract: According to the invention there is provided a process for the simultaneous production of glycerol, carotenes(.beta.-carotene, its isomers and carotene-like substances) and protein rich material which comprises cultivating algae of the Dunaliella bardawil species under high-intensity illumination in a growth medium containing a high concentration of sodium chloride (at least 1,5 M in the final stage of the cultivation), providing an adequate supply of carbon, in a depth of not exceeding 20 cm of the aqueous medium, in a diurnal cycle of illumination, until algae of high content of the above three components are obtained, harvesting the algae and recovering from same the three constituents.

Abstract: A process for the production of glycerol and proteinous substances of nutritive value which comprises cultivating algae of the Dunaliella species in a nutrient medium containing the mineral requirements of growth of the algae, said nutrient medium having a sodium chloride content of at least 1.5 M, the cultivation being effected while an adequate supply of carbon dioxide is provided and continued until a maximum concentration of algae is obtained, and continuing the cultivation of the algae in a nutrient medium having a content of sodium chloride of at least 3 M, cultivating the algae in this second nutrient medium until a high glycerol content is established, harvesting the algae, recovering from same the glycerol, and recovering the residue having a high protein content.

Abstract: An alga named Dunaliella bardawil is similar to D. salina except that its length is 15-19 .mu.m, its diameter 10-14 .mu.m and its volume 200-1000 .mu.m.sup.3, and it contains large quantities of carotene and glycerol.