The effects of CdSe/ZnS quantum dots on the photosynthesis rate of the Chlorella Vulgaris beads
The effects of CdSe/ZnS quantum dots on the photosynthesis rate of the Chlorella Vulgaris beads
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CdSe/ZnS量子点对小球藻珠光合速率的影响
DOI：
10.1016/j.algal.2023.103095
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Du, Ke
中科院分区：
文献类型：
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作者：
Dissanayake, Wimeth;Hailstone, Richard;Castillo, Leslie;Nafar, Fateme “Sara”;Bao, Mengdi;Wang, Ruo-Qian;Gates, Colin;Yong, Xin;Du, Ke
进行光合作用的微藻可产生大气中超过 50% 的氧气，对于珊瑚礁等许多生命系统的生存至关重要。为了解决珊瑚礁的衰退问题，人们引入了人工珊瑚礁，将微藻细胞封装在聚合物基质中，但纳米级污染物对这些工程系统的影响尚未完全了解。在这项工作中，使用尺寸小于 10 nm 的量子点来阐明用普通小球藻 (C. vulgaris) 封装的海藻酸钠珠的光合作用性能。荧光量子点可以移动到藻酸盐基质中，并且藻珠中的荧光强度与量子点浓度相关。我们进一步表明，藻珠的光合作用对量子点浓度敏感，而且对时间敏感。在量子点暴露的前 48 分钟内，二氧化碳吸收和氧气产生量都很低，表明光合作用有限。初始孵化后，光合作用速率迅速增加，尽管在较高浓度的量子点下仍然观察到更多的抑制。测量的电子传输速率显示出类似的趋势，并且对量子点浓度也敏感。
Photosynthesizing microalgae produce >50 % of oxygen in the atmosphere and are crucial for the survival of many living systems such as coral reefs. To address the declining of coral reefs, artificial reefs have been introduced to encapsulate the microalgae cells in a polymer matrix but the effects of nanoscale pollutants on these engineered systems have not been fully understood. In this work, quantum dots with a size smaller than 10 nm are being used to elucidate the photosynthesis performance of the sodium alginate beads encapsulated withChlorella vulgaris(C. vulgaris). The fluorescent quantum dots can move into the alginate matrix and the fluorescence intensity in the algae beads is correlated with the quantum dot concentration. We further show that the photosynthesis of the algae beads is sensitive to the quantum dot concentration and are also time sensitive. In the first 48 min of quantum dot exposure, both carbon dioxide absorption and oxygen production are low, suggesting limited photosynthesis. After the initial incubation, the photosynthesis rate quickly increases even though more inhibition is still observed with higher concentration of the quantum dots. The measured electron transport rate shows a similar trend and is also sensitive to the quantum dot concentration.