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Outdoor cultivation of a nitrogen-fixing marine cyanobacterium, Anabaena sp. ATCC 33047

机译：固氮海洋蓝细菌Anabaena sp。的户外栽培。 ATCC 33047

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摘要

Optimization of conditions for outdoor production of the nitrogen-fixing cyanobacterium Anabaena sp. ATCC 33047 has been pursued. In open ponds operated under semi-continuous regime biomass productivity values achieved ranged from 9 g (dry weight) m~(-2) per day, in winter, to over 20 g m~(-2) per day, in summer, provided that key operation parameters, including cell density, were optimized. Under these conditions the efficiency of solar energy conversion by the cells was fairly constant throughout the year, with photosynthetic efficiency values higher than 2%. The cyanobacterial biomass was rich in high-value phycobiliproteins, namely allophycocyanin and phycocyanin, for which open cultures of marine Anabaena represent a most interesting production system. The performance of Anabaena cultures operated under conditions regime in a closed tubular reactor has also been assessed outdoors, in winter. Biomass productivity values similar to those obtained in the ponds have been recorded for the closed system. Additionally, under these conditions, the cells excreted to the medium large amounts of a previously characterized exopolysaccharide, at production rates as high as 35 g m~(-2) per day (1.4 g l~(-1) per day). Properly operated closed cultures of this strain of Anabaena appear most suitable for outdoor mass production of valuable extracellular polysaccharides.
机译：固氮蓝细菌鱼腥藻室外生产条件的优化。一直追求ATCC 33047。在半连续状态下操作的开阔池塘中，生物量生产率值从冬季每天9 g（干重）m〜（-2）到夏天每天超过20 gm〜（-2）不等。优化了关键操作参数，包括细胞密度。在这些条件下，电池全年转换太阳能的效率相当稳定，光合效率值高于2％。蓝藻生物质富含高价值的藻胆蛋白，即别藻蓝蛋白和藻蓝蛋白，对于它们而言，海洋鱼腥藻的开放培养是最有趣的生产系统。在冬季，在室外也评估了在密闭管式反应器中在条件下操作的鱼腥藻培养物的性能。对于封闭系统，已经记录了类似于池塘中获得的生物量生产率值。另外，在这些条件下，细胞以高达每天35 g m·（-2）（每天1.4 g l·（-1））的生产率分泌到中等数量的先前表征的胞外多糖中。该鱼腥藻菌株的正确封闭培养似乎最适合于室外大量生产有价值的细胞外多糖。

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