Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China.
Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, China.
Nat Commun. 2024 Jun 11;15(1):4992. doi: 10.1038/s41467-024-49429-0.
It has been previously shown that devices based on microbial biofilms can generate hydrovoltaic energy from water evaporation. However, the potential of hydrovoltaic energy as an energy source for microbial growth has remained unexplored. Here, we show that the electroautotrophic bacterium Rhodopseudomonas palustris can directly utilize evaporation-induced hydrovoltaic electrons for growth within biofilms through extracellular electron uptake, with a strong reliance on carbon fixation coupled with nitrate reduction. We obtained similar results with two other electroautotrophic bacterial species. Although the energy conversion efficiency for microbial growth based on hydrovoltaic energy is low compared to other processes such as photosynthesis, we hypothesize that hydrovoltaic energy may potentially contribute to microbial survival and growth in energy-limited environments, given the ubiquity of microbial biofilms and water evaporation conditions.
先前已经表明，基于微生物生物膜的设备可以从水蒸发中产生水力发电能源。然而，水力发电能源作为微生物生长的能源的潜力尚未得到探索。在这里，我们表明，好氧自养菌 Rhodopseudomonas palustris 可以通过细胞外电子摄取，直接利用蒸发诱导的水力发电电子在生物膜内进行生长，强烈依赖于与硝酸盐还原偶联的碳固定。我们用另外两种好氧自养细菌也得到了类似的结果。尽管与光合作用等其他过程相比，基于水力发电的微生物生长的能量转换效率较低，但我们假设，鉴于微生物生物膜和水蒸发条件的普遍性，水力发电能源可能有助于微生物在能量有限的环境中生存和生长。
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