Mechanisms of microbial co-aggregation in mixed anaerobic cultures

Applied Microbiology and Biotechnology, Journal Year: 2024, Volume and Issue: 108(1)

Published: July 4, 2024

Abstract Co-aggregation of anaerobic microorganisms into suspended microbial biofilms (aggregates) serves ecological and biotechnological functions. Tightly packed aggregates metabolically interdependent bacteria archaea play key roles in cycling carbon nitrogen. Additionally, applications, such as wastewater treatment, provide a complete metabolic network to convert complex organic material. Currently, experimental data explaining the mechanisms behind co-aggregation anoxic environments is scarce scattered across literature. To what extent does this process resemble aerobic environments? Does limited availability terminal electron acceptors drive mutualistic relationships, contrary commensal relationships observed oxygen-rich And do co-aggregating archaea, which depend on each other harvest bare minimum Gibbs energy from energy-poor substrates, use similar cellular those used by pathogenic that form biofilms? Here, we an overview current understanding why how mixed communities co-aggregate discuss potential future scientific advancements could improve study aggregates. Key points • Metabolic dependency promotes aggregation Flagella, pili, adhesins role formation Cyclic di-GMP/AMP signaling may trigger polysaccharides production anaerobes

Language: Английский

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Red Light Enhanced Nitrogen Removal Efficiency by Bacterial-Algae Biofilm Reactor in Recirculating Aquaculture Systems

Published: Jan. 1, 2025

With the increasing application of Recirculating Aquaculture Systems (RAS) in modern aquaculture production, importance water quality management has gained significant attention. To investigate impact light wavelengths on nitrogen removal efficiency Bacteria-Algae Biofilm Reactor (BABR), four RAS were built. Each was exposed to different forms red (400–500 nm), blue (600-700 red-blue mixed (1:1 ratio), and white (400-700nm). The results indicated that significantly improved comparing light. When exposing light, as carbon-to-nitrogen ratio increased from 1:1 2:1, concentrations for ammonia nitrite reduced 1.17±0.25 mg/L 0.73±0.31 0.21±0.14 0.05±0.01 mg/L. Red up-regulated abundance genes related photosynthesis metabolism. This research provided a theoretical basis technical reference efficient by BABR.

Language: Английский

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Simultaneous Nitrification–Endogenous Denitrification with Phosphorus Removal Sustained by Aeration-Free Filamentous Microalgal–Bacterial Granular Sludge for Low C/N Wastewater Treatment

ACS ES&T Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

The innovative and carbon-neutral phototrophic simultaneous nitrification–endogenous denitrification with phosphorus removal (P-SNDPR) process presents significant advantages for low C/N wastewater treatment. Effective implementation of SNDPR relies on establishing anoxic zones during light-aerobic stages, which poses challenges in suspended sludge systems. Microalgal–bacterial granular (MBGS) may address these due to its biological chemical stratified microniches, although the granulation, structure, performance MBGS under aeration-free conditions remain unreported. This study successfully cultivated filamentous a distinct oxygen gradient microbial stratification within landscape. Filamentous cyanobacteria (f_Leptolyngbyaceae) functional genera responsible nutrient granulation (Acinetobacter, Candidatus Competibacter, Zoogloea, Flavobacterium, Hydrogenophaga) were enriched. had high efficiencies COD (92.9 ± 1.2%), NH4–N (95.0 0.7%), TN (83.8 1.4%), PO4–P (96.8 0.9%) an aerobic SND efficiency 77.8 2.7%. Typical cycle batch tests demonstrated that achieved efficient SNDPR. Mass balance calculations indicated most removed carbon (76.0%) (97.6%) converted biomass. MBGS-SNDPR established synergistic pathway carbon, nitrogen, metabolism, suggesting potential applications sustainable

Language: Английский

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Role of Microbial Communities as Co-culture for Mass-Scale Production of Algal Biomass for Industrial Applications

Published: Jan. 1, 2025

Language: Английский

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High-throughput community and metagenomic elucidate systematic performance variation and functional transition mechanisms during morphological evolution of aerobic sludge

Bioresource Technology, Journal Year: 2025, Volume and Issue: 429, P. 132550 - 132550

Published: April 15, 2025

Language: Английский

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Picocyanobacterial-bacterial interactions sustain cyanobacterial blooms in nutrient-limited aquatic environments

Environmental Research, Journal Year: 2024, Volume and Issue: 260, P. 119508 - 119508

Published: June 28, 2024

Language: Английский

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The shifts in microbial interactions and gene expression caused by temperature and nutrient loading influence Raphidiopsis raciborskii blooms

Water Research, Journal Year: 2024, Volume and Issue: 268, P. 122725 - 122725

Published: Oct. 31, 2024

Language: Английский

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Hydrodynamic cultivation of aeration-free oxygenic photogranules is favored by sufficient amounts of organic carbon

Bioresource Technology, Journal Year: 2024, Volume and Issue: 401, P. 130736 - 130736

Published: April 24, 2024

Language: Английский

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Metagenomic insights into microalgae-bacterium-virus interactions and viral functions in phycosphere facing environmental fluctuations

Water Research, Journal Year: 2024, Volume and Issue: 268, P. 122676 - 122676

Published: Oct. 22, 2024

Language: Английский

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Diel asynchrony in the expanded characteristics of toxic cyanobacterial blooms revealed by integrated metabolomics and metagenomics

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 136403 - 136403

Published: Nov. 7, 2024

Language: Английский

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