AI Article Synopsis
- - The study explored how different nitrogen sources affect microbial protein production in hydrogen-oxidizing bacteria (HOB) by comparing nitrogen fixation and ammonium assimilation in a controlled environment.
- - Results showed that nitrogen-fixing HOB (NF-HOB) outperformed previous expectations in producing carbon and nitrogen, achieving significant biomass yields under basic cultivation conditions.
- - The addition of ammonium dramatically boosted microbial protein synthesis and biomass growth, likely by promoting specific bacterial species and enhancing nitrogen uptake mechanisms.
Article Abstract
To investigate the effects of nitrogen source supply on microbial protein (MP) production by hydrogen-oxidizing bacteria (HOB) under continuous feed gas provision, a sequencing batch culture comparison (N fixation versus ammonium assimilation) was performed. The results confirmed that even under basic cultivation conditions, N-fixing HOB (NF-HOB) communities showed higher levels of CO and N fixation (190.45 mg/L Δ COD and 11.75 mg/L Δ TN) than previously known, with the highest biomass yield being 0.153 g CDW/g COD-H. Rich ammonium stimulated MP synthesis and the biomass accumulation of communities (increased by 7.4 ～ 14.3 times), presumably through the enhancement of H and CO absorption. The micro mechanism may involve encouraging the enrichment of species like Xanthobacter and Acinetobacter then raising the abundance of nitrogenase and glutamate synthase to facilitate the nitrogen assimilation. This would provide NF-HOB with ideas for optimizing their MP synthesis activity.
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| http://dx.doi.org/10.1016/j.biortech.2023.130199 | DOI Listing |
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