Moisture-driven CO2 direct air capture and delivery for cultivating cyanobacteria
Justin FloryShuqin LiSterling A. TaylorShivam TiwariJason KmonThiago Stangherlin BarbosaNick LoweryJoel ElistonGarrett D. ColeJason C. QuinnMatthew GreenJohn McGowenKlaus S. LacknerWim Vermaas
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A system called AUDACity was developed and demonstrated for continuously delivering ~100 g per day of direct air-captured (DAC) CO2 into aqueous alkaline solutions within a 4.2 m2 outdoor raceway pond in a moisture-driven process. Anion-exchange resin particles contained within elongated mesh tube packets were found to reduce drying and CO2 loading time ~4-fold over larger mesh bags, which allowed the sorbent to clump and reduce surface area exposed to air, as measured in a closed loop wind tunnel. The system was used for cultivating the cyanobacterium Synechocystis sp. PCC 6803 in a 4.2 m2 outdoor raceway pond. The culture grown in the AUDACity pond did not show visible contamination whereas a control pond without AUDACity showed contamination from amoeba and diatoms. Biofouling of the sorbent packets during cultivation reduced its CO2 binding capacity by ~50%, which was partially restored to 75% of its initial capacity after sequentially washing in 0.04% bleach, 1 mM HCl and then 0.5 M NaHCO3.Abstract The ability to use dissolved silicon has been found in various oceanic phytoplankton, including eukaryotic diatoms and prokaryotic cyanobacteria. While the silicification process in diatoms has been extensively studied, it is poorly known in cyanobacteria. In this study, the Cyanobacteria ( Synechococcus ) silicification and its evolutionary relationships of silicon-related proteins with different phytoplankton and algae were compared. Results showed that, compared to others, cyanobacteria have similar silicification proteins as diatoms. In detail, cyanobacteria and diatoms displayed three silicification-related proteins (SIT, Silaffins, and Pleuralins), while several genera showed one or two of them, suggesting that cyanobacteria might have developed a Si related mechanism earlier than the diatoms and other species. Our findings show that, despite cyanobacteria’s earlier silicon mechanism compared to others, they might not use efficient Si accumulation, perhaps adapting unique intracellular elemental variation for their cellular processes for growth potential.
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这研究的目的是在乔胡湖，描述浮游植物集合的时间、空间的变化，并且讨论位于这些变化下面的可能的机制在中国的一个大浅发育营养正常促进剂湖，与 cyanobacteria 上的强调。191 浮游植物种类的一个总数被识别，在哪个评价的绿色植物(101 ) 之中第一，由 Cyanophytes (46 ) 和 Bacillariophytes (28 ) 列在后面。平均在全部湖上，最大的全部的海藻的生物资源在 11 月与最小(5.05 mg/l ) 出现在 6 月(19.70 mg/l ) 。以累年平均生物资源， cyanobacteria 贡献了 45.43% 总计海藻的生物资源，跟随的 byChlorophytes (27.14%) ，和 Bacillariophytes (20.6%) 。当硝酸盐(NO3-N ) 和集中顺便坐坐的铵(NH4-N ) 跳时，修理氮的 cyanobacterium (淡水藻类的一种) 快速开发了 dranked 第一以在夏天的生物资源。zooplanktivorous 鱼和小甲壳纲的动物浮游动物的那优势赞成了发展，是可能的不可食细丝状或殖民地形成 cyanobacteria。在整个所有季节的 cyanobacteria 的坚持的优势可以在乔胡湖显示对超营养作用的浮游植物的反应的一个新趋势……
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Organic compounds produced by the photosynthesis of cyanobacteria are mostly consumed for the cyanobacterial division. We proposed a hypothesis that some cyanobacteria might increase the released organic compounds from the cyanobacteria when their divisions are suppressed. We previously developed a microfluidic device for culturing cyanobacteria under the suppression of their divisions, though it could not fully suppress the divisions of cyanobacteria. In order to solve this problem, the micro-pillars and the bottom of the channel were designed to be brought into contact, and the the chamber, where the divisions of cyanobacteria are suppressed, was isolated. The cyanobacteria in the chamber were well stored by micro-pillars both at the center and edge area for 24 hours.
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In recent years,the cyanobacteria outbreaks frequently in Taihu Lake,a lot of Cyanobacteria were salvaged,Cyanobacteria is a kind of biomass resources with variety of useful material,the use of it is worthy of in-depth study.This paper briefly outlined the comprehensive utilization of cyanobacteria in recent years home and abroad,And briefly accounted the study of the transformation of cyanobacteria into yeast using biotechnology in authors' laboratory.Also we explored the other ways of the use of cyanobacteria.
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Organic compounds produced by the photosynthesis of cyanobacteria are mostly consumed for the cyanobacterial division. We propose a hypothesis that the suppression of the cyanobacterial division might make cyanobacteria mutate themselves, and mutated cyanobacteria might release the organic compounds from their bodies to survive. To verify the hypothesis, we have to detect the organic compounds released from the cyanobacteria. For this purpose, large numbers of cyanobacteria should be cultured under the suppression of the division. We develop a microfluidic device with hydraulically-actuated micro-pillar array to trap large numbers of cyanobacteria and medium supply to culture cyanobacteria under an appropriate cultural condition. Using the microfluidic device, cyanobacteria are trapped by the micro-pillar array, and cultured to hundreds of cyanobacteria inside the space surrounded by micro-pillars, which might suppress cyanobacterial division due to high density of cyanobacteria.
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The effect of boron on heterocystous and nonheterocystous dinitrogen fixing Cyanobacteria was examined. The absence of boron in culture media inhibited growth and nitrogenase activity in Nodularia sp., Chlorogloeopsis sp., and Nostoc sp. cultures. Examinations of boron-deficient cultures showed changes in heterocyst morphology. However, cultures of nonheterocystous Cyanobacteria, Gloeothece sp. and Plectonema sp., grown in the absence of boron did not show any alteration in growth or nitrogenase activity. These results suggest a requirement of boron only by heterocystous Cyanobacteria. A possible role for this element in the early evolution of photosynthetic organisms is proposed.
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