Cyanobacteria hold promise for simultaneous carbon capture and chemicals production, but the regulation and effect of nitrogen (N) and phosphorus (P) remains unclear. This study investigates major productions of glycogen, protein, and C-phycocyanin (C-PC) in PCC10605 under different N/P levels, alongside changes in light and CO. Increasing nitrate (NO) from 2 to 6 mM resulted in a 9.7-fold increase in C-PC and reduced glycogen to 8.9 %. On the other hand, elevating phosphorus from 0.1 to 2 mM under limited nitrogen enhanced biomass and glycogen through the upregulation of carbonic anhydrase, ADP-glucose pyrophosphorylase, and glycogen phosphorylase. Changes in phosphorus levels and CO inlet concentrations affected metabolites accumulation and carbon capture efficiency, leading to the best condition of 76 % uptake capacity in direct air capture (DAC). All findings underscore the trade-off between glycogen and protein, representing the importance of N/P levels in nutrient modulation of PCC10605.

中文翻译：

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调整氮和磷水平以调节嗜盐蓝藻 aponinum PCC10605 中的糖原和蛋白质生产


蓝藻有望同时捕获碳和生产化学品，但氮 (N) 和磷 (P) 的调节和影响仍不清楚。这项研究调查了不同 N/P 水平下 PCC10605 中糖原、蛋白质和 C-藻蓝蛋白 (C-PC) 的主要产生，以及光和 CO 的变化。将硝酸盐 (NO) 从 2 mM 增加到 6 mM 会导致 9.7- C-PC 成倍增加，糖原减少至 8.9%。另一方面，在有限的氮条件下，通过上调碳酸酐酶、ADP-葡萄糖焦磷酸化酶和糖原磷酸化酶，将磷含量从 0.1 mM 提高到 2 mM，从而增强生物量和糖原。磷水平和 CO 入口浓度的变化影响代谢物积累和碳捕获效率，导致直接空气捕获 (DAC) 吸收能力达到 76% 的最佳状态。所有研究结果都强调了糖原和蛋白质之间的权衡，代表了 N/P 水平在 PCC10605 营养调节中的重要性。