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首页> 外文期刊>Phycological Research >Effect of nitrogenous resource on growth, biochemical composition and ultrastructure of Isochrysis galbana (Isochrysidales, Haptophyta)
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Effect of nitrogenous resource on growth, biochemical composition and ultrastructure of Isochrysis galbana (Isochrysidales, Haptophyta)

机译：含氮资源对球等鞭藻生长，生化组成和超微结构的影响

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摘要

The nitrogenous resource used to promote algal growth has cost implications for mass culture processes. The present study therefore aimed to determine the effect of different nitrogenous resources (nitrate, ammonium and urea) on various performance parameters (growth, final cell yield, pigmentation, lipid yield and cellular and sub-cellular characteristics) in Isochrysis galbana. Growth rate was unaffected by nitrogenous resource, but the final cellular yield in the nitrate and urea treatments far exceeded that evident in the ammonium treatments. The reduced cell yield in ammonium treatments and the earlier onset of the stationary phase was brought about by nitrogen-starvation due to an increase in pH and resultant ammonia volatilization. This starvation initiated an early onset of lipid accumulation, chlorophyll depletion and an increase in the carotenoid to chlorophyll ratio relative to the other nitrogen (N) source treatments. Hence, in spite of being potentially the preferred source of N by algae (due to its reduced state), ammonium-nitrogen is undesirable for mass culture. The performance parameters of Isochrysis grown in urea (an organic N source) and nitrate (an inorganic N source) were similar, but lipid accrued earlier in cells grown in medium supplemented with urea. This is advantageous for lipid acquisition for the production of biodiesel since it would reduce the duration of photobioreactor runs. Urea is easily available and considerably cheaper than all the other N sources tested and is thus recommended as the nitrogenous resource for large-scale culture of I.galbana for biodiesel production.
机译：用于促进藻类生长的含氮资源对大规模培养过程具有成本影响。因此，本研究旨在确定不同含氮资源（硝酸盐，铵盐和尿素）对球等鞭金藻各种性能参数（生长，最终细胞产量，色素沉着，脂质产量以及细胞和亚细胞特征）的影响。增长速度不受氮源的影响，但硝酸盐和尿素处理的最终细胞产量远远超过铵盐处理所显示的。由于pH升高和氨气挥发，氮饥饿导致铵处理中细胞产率降低和固定相更早开始。与其他氮源处理相比，这种饥饿导致脂质蓄积，叶绿素耗竭和类胡萝卜素与叶绿素比例的增加提前开始。因此，尽管潜在地被藻类作为优选的氮源（由于其还原态），铵氮对于大量培养是不可取的。在尿素（有机氮源）和硝酸盐（无机氮源）中生长的等渗线的性能参数相似，但在补充尿素的培养基中生长的细胞中脂质的积累较早。这对于生产生物柴油的脂质获取是有利的，因为它将减少光生物反应器运行的持续时间。尿素容易获得，并且比所有其他测试过的氮源便宜得多，因此，尿素被建议用作大规模种植加纳巴纳豆以生产生物柴油的含氮资源。

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