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Growth aspects of the marine microalga Nannochloropsis gaditana

机译：海洋微藻Nannochloropsis gaditana的生长方面

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摘要

Nannochloropsis is well appreciated in aquaculture due to its nutritional value and the ability to produce valuable chemical compounds, such as pigments (zeaxanthin, astaxanthin...) and polyunsaturated fatty acids (EPA). Commercial exploitation needs high cell densities but the low growth rate and the small size of cells are practical difficulties. To increase biomass concentration the positive effect of several factors was evident: (i) pH ≈ 8 control (with dilute Tris-HCl buffer); (ii) the continuous illumination (no evidence of photo-inhibition was observed); (iii) a quite large temperature range (25 ± 5 ℃); (iv) the presence of organic carbon source (with the danger of contamination); (v) the presence of urea as an additional nitrogen source (10 mM); (vi) a small air flow rate with large bubbles can be more efficient for CO_2 mass transfer (associated to reduced shearing).
机译：拟南芥由于其营养价值和能够生产有价值的化合物（例如色素（玉米黄质，虾青素...）和多不饱和脂肪酸（EPA））的能力而在水产养殖中广受赞誉。商业开发需要高细胞密度，但是低生长速率和小细胞尺寸是实际的困难。为了增加生物质浓度，几个因素的积极作用是明显的：（i）pH≈8对照（使用稀释的Tris-HCl缓冲液）; （ii）连续照明（未观察到光抑制迹象）; （iii）相当大的温度范围（25±5℃）; （iv）存在有机碳源（有被污染的危险）; （v）存在尿素作为额外的氮源（10 mM）; （vi）具有大气泡的小空气流速对于CO_2的传质（与降低的剪切力有关）更为有效。

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