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  • responses of synechocystis sp. pcc 6803 to total dissolved solids in long-term continuous operation of a photobioreactor

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 620
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -

    this study evaluated how synechocystis sp. pcc 6803 responds to high total dissolved solids (tds) associated with eliminating nutrient limitation during long-term operation of a photobioreactor. the unique feature is that the tds were not dominated by na+ and cl, as in seawater, but by hco3 and no3 from nutrient delivery. the tds-stress threshold was about 10 g/l. whereas inorganic n and p limitations slowed the rate of inorganic c (ci) uptake in the light, tds stress was manifested most strongly as a substantial increase of endogenous respiration rate at night. relief from tds stress was incomplete when lowered ph led to a hco3 increase (560 mg c/l as a threshold). impaired photosynthesis led to a cascade of reduced ci-uptake, ph decrease, hco3 accumulation, and hco3-associated stress. thus, long-term photobioreactor operation requires balancing the delivery rates of co2, n, p, and other tds components to avoid general and ci-associated tds stresses.

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