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SM ISO690:2012 RUDIK, V., RUDI, Ludmila, CHIRIAC, Tatiana, CEPOI, Liliana, MISCU, Vera, CODREANU, Svetlana, IATSKO, I., SADOVNIC, Daniela, GHELBET, Viorica, VALUŢĂ, Ana, DONI, Veronica, CIOBAN, Mihaela. β-carotene synthesis in spirulina biomass during the cultivation at illumination stress conditions. In: Microbial Biotechnology, 12-13 octombrie 2016, Chișinău. Chișinău, Republica Moldova: Institutul de Microbiologie şi Biotehnologie, 2016, Ediția 3, p. 183. |
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Microbial Biotechnology Ediția 3, 2016 |
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Conferința "Microbial Biotechnology" Chișinău, Moldova, 12-13 octombrie 2016 | ||||||
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Pag. 183-183 | ||||||
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Spirulina platensis strain CNMN-CB-11 was grown under standard conditions of continuous illumination. On day 3 of the cultivation cycle, spirulina has been subjected to stress by reducing the illumination period to 4 hours. These conditions were followed until day 7 of cultivation, when the lighting regime was restored and maintained until day 10 of the experimental cycle. The synthesis of beta-carotene reacted quickly to changing the lighting regime. On the first day of light stress, carotene content was reduced by 15% compared to the carotene in spirulina biomass grown under standard conditions. On the second day of light-induced stress, the carotenoid content was reduced by 21% maximum. The variations in the carotene values of spirulina biomass in both experimental variants are identical in the first 6 days of cultivation, even under conditions of induced stress. On day 7 of the cultivation cycle (which corresponds to the first day of returning to the normal thermal regimen), the carotene content in the control variant decreased by 25% compared to the previous day and the carotene content in the experimental variant with restored lighting regime increased by 23%. Thus, in spirulina biomass subjected for four days to light stress, the return to the normal illumination induces the synthesis of carotene, which exceeds by 26% its content in spirulina biomass, grown under optimal standard conditions. The next two days of cultivation, carotene content increased in both experimental variants, but remains higher by 15% in case of induced stress conditions. Therefore, light stress, which reduces carotene synthesis into spirulina biomass, induces its synthesis in case of the return to the normal lighting regime. |
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