Complete genome sequence of the thermophilic bacterium Geobacillus subterraneus KCTC 3922 T as a potential denitrifier

Thermophilic microorganisms involved in the nitrogen cycle in thermal environments: Advances and prospects

Thermophilic microorganisms mediated significant element cycles and material conversion in the early Earth as well as mediating current thermal environments. Over the past few years, versatile microbial communities that drive the nitrogen cycle have been identified in thermal environments. Understanding the microbial-mediated nitrogen cycling processes in these thermal environments has important implications for the cultivation and application of thermal environment microorganisms as well as for exploring the global nitrogen cycle. This work provides a comprehensive review of different thermophilic nitrogen-cycling microorganisms and processes, which are described in detail according to several categories, including nitrogen fixation, nitrification, denitrification, anaerobic ammonium oxidation, and dissimilatory nitrate reduction to ammonium. In particular, we assess the environmental significance and potential applications of thermophilic nitrogen-cycling microorganisms, and highlight knowledge gaps and future research opportunities.

Complete Genome Sequence of Geobacillus sp. Strain E55-1, Isolated from Mine Geyser in Japan

We report here the complete genome sequence of Geobacillus sp. strain E55-1, isolated from the hot sediments of Mine Geyser in Japan. This strain exhibited ∼85% average nucleotide identity and ∼98.5% 16S rRNA sequence identity with the most closely related Geobacillus species.

We report here the complete genome sequence of Geobacillus sp. strain E55-1, isolated from the hot sediments of Mine Geyser in Japan. This strain exhibited ∼85% average nucleotide identity and ∼98.5% 16S rRNA sequence identity with the most closely related Geobacillus species.

Nitrification and denitrification processes for mitigation of nitrous oxide from waste water treatment plants for biovalorization: Challenges and opportunities

Nitrous oxide (N₂O) is a potent greenhouse gas. Even though its emissions is much lesser than CO₂ but its global warming potential (GWP) is 298 times more than CO₂. N₂O emissions from wastewater treatment plants was caused due to incomplete nitrification or incomplete denitrification catalyzed by ammonia-oxidizing bacteria and heterotrophic denitrifiers. Low dissolved oxygen, high nitrite accumulation, change in optimal pH or temperature, fluctuation in C/N ratio, short solid retention time and non-availability of Cu ions were responsible for higher N₂O leakage. Regulation of enzyme metabolic pathways involved in N₂O production and reduction has also been reviewed. Sequential bioreactors, bioscrubbers, membrane biofilters usage have helped microbial nitrification-denitrification processes in succumbing N₂O production in wastewater treatment plants. Reduction of N₂O negativity has been studied through its valorization for the formation of value added products such as biopolymers has led to biorefinery approaches as an upcoming mitigation strategy.