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Changes in the hydrocarbon-synthesizing activity during growth of Botryococcus braunii B70

Changes in the hydrocarbon-synthesizing activity during growth of Botryococcus braunii B70,10.1016/j.biortech.2011.08.072,Bioresource Technology,Rika

Changes in the hydrocarbon-synthesizing activity during growth of Botryococcus braunii B70  
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Botryococcus braunii is a green, colonial microalga that produces large amounts of hydrocarbons. B. braunii B70 was estimated to be B race by the incorporation of radioactivity from l-[methyl14C]-methionine into hydrocarbon. The hydrocarbon-synthesizing activity of B70 cells was determined by feeding experiments using 14C-compounds. NaH14CO3 incorporation rate into the hydrocarbon was high in the early logarithmic growth phase but it declined thereafter. Hydrocarbon-synthesizing activity from [2-14C] pyruvate in 15-day cells was 80% of that in 5-day cells. In contrast, hydrocarbon-synthesizing activity from NaH14CO3 and l-[methyl14C]-methionine decreased remarkably by 15days after inoculation. Hence, the allocation of carbon was a regulatory step in hydrocarbon biosynthesis during the early logarithmic growth phase. The high activity of pentose phosphate pathway in the early logarithmic growth was seemed to be the contribution of the supply of NADPH for botryococcene synthesis.
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