Relationship between Poly- β-hydroxybutyrate Production andδ-endotoxin forBacillus thuringiensisvar.kurstaki

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A linear relationship between total solid concentration (TSC), δ-endotoxin production [Cry = 0.2795(TSC)-0.2472, R2 = 0.8644] and poly-β-hydroxybutyrate (PHB) accumulation [PHB = 0.1327(TSC) + 0.3974, R2 = 0.9877] in Bacillus thuringiensis var. kurstaki HD-73 was observed. A similar correlation between δ-endotoxin and PHB accumulation [Cry = 2.1573(PHB)-1.1248, R2 = 0.9181] was found. A minimum PHB accumulation of 0.52 mg l-1 was required before the onset of δ-endotoxin production.

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