Editorial: Ecology, Metabolism and Evolution of Archaea-Perspectives From Proceedings of the International Workshop on Geo-Omics of Archaea

Aims One of the main challenges of culture-independent soil microbiology is distinguishing the microbial community's viable fraction from dead matter. Propidium monoazide (PMA) binds the DNA of dead cells, preventing its amplification. This dye could represent a robust means to overcome the drawbacks of other selective methods, such as RNA-based analyses. Methods and results We quantified functional genes from viable archaea and bacteria in soil by combining the use of PMA and qPCR. Four N-cycle-related functional genes (bacterial and archaeal ammonia monooxygenase, nitrate reductase and nitrite reductase) were successfully quantified from the living fraction of bacteria and archaea of a paddy soil. The protocol was also tested with pure bacterial cultures and soils with different physical and chemical properties. Conclusions The experiment results revealed a contrasting impact of mineral and organic fertilizers on the abundance of microbial genes related to the N cycle in paddy soil.

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Highlighting the Role of Archaea in Urban Mine Waste Exploitation and Valorisation

Azim

Bellini

Vizzarro

et al. 2023

Recycling

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E-materials become e-waste once they have been discarded without the intent of reuse. Due to its rich content of metals, among which many are Critical Raw Materials (CRMs), e-waste can be considered an urban mine to exploit and valorise. Common metal refining is performed by energy-intensive processes frequently based on the use of fossil fuel. Bio-metallurgy is a promising alternative for e-waste valorisation based on biological routes of specialised microorganisms able to leach solid-containing metals. Because of the physiology of these microorganisms, microbial leaching can be economically feasible, besides being an environmentally sustainable process. Like Bacteria and Fungi, Archaea are also capable of metal leaching activity, though their potential is underestimated. Among them, the extremophiles are the most studied and applied in the field of metal recovery, while mesophilic species are less common but still of high interest. Here we provide the state of industrial application of bio-metallurgy and report on the state of the art of Archaea exploitation in metal recovery from e-waste. Moreover, we give a special highlight to methanogenic archaea, which are able to convert CO2 into methane in order to highlight the potential for the valorisation of CO2-rich industrial streams generated by key processes (i.e., anaerobic digestion, concrete, and steel production) in CH4 for gas grid distribution, while making metals content in e-waste available again as raw material.

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Editorial: Ecology, Metabolism and Evolution of Archaea-Perspectives From Proceedings of the International Workshop on Geo-Omics of Archaea

Cited by 3 publications

References 63 publications

Experimental warming leads to convergent succession of grassland archaeal community

Experimental warming leads to convergent succession of grassland archaeal community

Quantification of nitrogen cycle functional genes from viable archaea and bacteria in paddy soil

Highlighting the Role of Archaea in Urban Mine Waste Exploitation and Valorisation

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