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The effects of diurnal variation of photosynthetically active radiation (PAR; 400–700 nm) and ultraviolet-B (UV-B; 280–315 nm) radiation on phycobiliproteins (PBPs) and photosynthetic pigments (PP) have been studied in the hot-spring cyanobacterium Nostoc sp. strain HKAR-2. The variations in PBPs and PP were monitored by alternating light and dark under PAR, UV-B, and PAR + UV-B radiations over a...
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