Microalgae Nannochloropsis sp. is a widely recognized renewable biodiesel feedstock. The ability of this microalgae to absorb CO₂ constitutes an added value toward reducing global warming. However, the process of optimizing its growth still involves many challenges. Photoinhibition, which takes places during microalgae cultivation when using continuous lighting, constitutes an unresolved problem. Therefore, the optimum light/dark cycle method is considered necessary. The experiments were conducted using a designed, tubular airlift photobioreactor and blue, energy-saving, light-emitting diode (LED) lights for the purpose of internal illumination. We observed that a 45:15 min (light:dark) cycle increased the production of Nannochloropsis sp. biomass significantly, with a cell density, wet weight, and lipid content of 17 × 10⁶ cell/ml, 7.11 g, and 10.1% dry weight, respectively. By using the blue LED lights, our designed, airlift photobioreactor increased cell growth by 70% compared to the growth of Nannochloropsis sp. in nature and produced 61 times higher lipid content compared to Nannochloropsis sp. that is exposed to natural light.

中文翻译：

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提高了微藻Nannochloropsis sp。的生物量生产力。在带有蓝色LED的低频闪光灯的空运光生物反应器中

微藻Nannochloropsis sp。是一种公认​​的可再生生物柴油原料。该微藻吸收CO ₂的能力构成了减少全球变暖的附加值。然而，优化其增长的过程仍然涉及许多挑战。在使用连续照明的微藻培养过程中发生的光抑制问题尚未解决。因此，认为最佳的明/暗循环方法是必要的。实验是使用设计的管状气举式光生物反应器和蓝色节能发光二极管（LED）灯进行内部照明的。我们观察到，一个45:15分钟（光照：黑暗）循环增加了生产的微拟球藻sp。生物量显着，细胞密度，湿重和脂质含量分别为17×10 ^6个细胞/ml、7.11 g和10.1％干重。通过使用蓝色LED灯，与Nannochloropsis sp。的生长相比，我们设计的空运光生物反应器使细胞生长增加了70％。在自然界中产生的脂质含量是Nannanchloropsis sp。的61倍。暴露在自然光下。