title: Effect of monochromatic illumination on lipid accumulation of Nannochloropsis gaditana under continuous cultivation.
abstract: Although nitrogen starvation is frequently used to increase lipid contents in microalgae, it has a negative effect on cellular growth. Since light supply is essential for photosynthetic organisms, the effects of cultivation under monochromatic illumination on the growth and lipid contents of Nannochloropsis gaditana were assessed. Continuous cultivation under blue and red light conditions improved the productivity and physical properties for biodiesel from this microalga. FAME yield was twofold higher under red light than under normal white light (21.12% vs 11.35%), with no significant difference in growth rates. Blue and red light increased photosynthetic oxygen evolution, carbon fixation and nutrient uptake. In total, more significant physiological changes were observed under red than under blue light. These results show that red light illumination may be useful for enhancing lipid production by N. gaditana, with the increased photosynthetic reducing equivalents induced by red light which could be deposited as lipids and carbohydrates.
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Chul Woong
authors.initials: CW
authors.lastname: Kim
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Min-Gyu
authors.initials: MG
authors.lastname: Sung
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Kibok
authors.initials: K
authors.lastname: Nam
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.
authors.forename: Myounghoon
authors.initials: M
authors.lastname: Moon
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea. Electronic address: jhkwon75@kaist.ac.kr.
authors.forename: Jong-Hee
authors.initials: JH
authors.lastname: Kwon
authors.affiliation: Department of Chemical and Biomolecular Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea; Advanced Biomass R&D Center, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea. Electronic address: jwyang@kaist.ac.kr.
authors.forename: Ji-Won
authors.initials: JW
authors.lastname: Yang
mesh_terms: D020418:Algal Proteins / Q000378:metabolism; D056804:Biofuels; D018533:Biomass; D050260:Carbohydrate Metabolism / Q000528:radiation effects; D057486:Carbon Cycle / Q000528:radiation effects; D002245:Carbon Dioxide / Q000378:metabolism; D018929:Cell Culture Techniques / Q000379:methods*; D004952:Esters / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism; D008027:Light; D050356:Lipid Metabolism / Q000528:radiation effects*; D009566:Nitrates / Q000378:metabolism; D058433:Photobioreactors; D010788:Photosynthesis / Q000528:radiation effects; D010860:Pigments, Biological / Q000378:metabolism; D058009:Stramenopiles / Q000166:cytology / Q000254:growth & development* / Q000528:radiation effects*
chemical_list: D020418:Algal Proteins; D056804:Biofuels; D004952:Esters; D005227:Fatty Acids; D009566:Nitrates; D010860:Pigments, Biological; D002245:Carbon Dioxide
keywords: Continuous cultivation; Lipid induction; Monochromatic illumination; Nannochloropsis gaditana; Wavelength