Laboratory and Field Investigations of Low Temperature Microbial Activity in Rivers

White, Kathleen D.; Reynolds, C. M.; Ringelberg, D.; Foley, Karen; Perry, Lawrence B.

doi:10.1061/40621(254)88

Cited by 1 publication

(2 citation statements)

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“…The other part of the microbiome was found to be significantly affected by temperature (sensitive group: SG), which mainly included Deinococcota, Chloroflexi, Firmicutes, Myxococcota, Spirochaetota, Acidobateriota, Planctomycetota, Desulfobacterota, Cyanobacteria, and Bdellovibrionota. The difference in the microbial SG in the two temperature-based GDM-UF systems might be due to the different dissolved oxygen (DO) level, as has been reported previously . The DO concentrations at 4 and 25 °C were 13.40 ± 0.16 and 8.3 ± 0.05 mg/L (Figure S2), respectively.…”

Section: Resultssupporting

confidence: 62%

“…The difference in the microbial SG in the two temperature-based GDM-UF systems might be due to the different dissolved oxygen (DO) level, as has been reported previously. 53 The DO concentrations at 4 and 25 °C were 13.40 ± 0.16 and 8.3 ± 0.05 mg/ L (Figure S2), respectively. The stability of the microbial IG was attributed to the richness (Figure 5b,c) and stress resistance of microorganisms at the genus level (LT, Limnohabitans, Deinocococcus, Diaphorobacter, and Pseudomonas; HT, Rhodobacter) (Figure 7c).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Influence of Temperature on Biofilm Formation Mechanisms Using a Gravity-Driven Membrane (GDM) System: Insights from Microbial Community Structures and Metabolomics

Siddique

Graham

et al. 2022

Environ. Sci. Technol.

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A biofilm has a significant effect on water treatment processes. Currently, there is a lack of knowledge about the effect of temperature on the biofilm structure in water treatment processes. In this study, a gravity-driven membrane ultrafiltration system was operated with river feedwater at two temperatures ("low", 4 °C; "high", 25 °C) to explore the biofilm structure and transformation mechanism. The results showed that the difference in dissolved oxygen concentration might be one of the main factors regulating the structural components of the biofilm. A denser biofilm formation and reduced flux were observed at the lower temperature. The linoleic acid metabolism was significantly inhibited at low temperature, resulting in enhanced pyrimidine metabolism by Na + accumulation. In addition, the biofilm at low temperature had a higher proportion of the metabolites of lipids and lipid-like molecules (11.25%), organic acids and derivatives (10.83%), nucleosides, nucleotides, and analogues (7.083%), and organoheterocyclic compounds (6.66%). These small molecules secrete more polysaccharides having CO and OC−O functional groups, which intensified the resistance of the biofilm. Furthermore, the upregulation pathway of pyrimidine metabolism also increased the risk of urea accumulation at low temperature. Limnohabitans, Deinococcus, Diaphorobacter, Flavobacterium, and Pseudomonas were identified as the principal microorganisms involved in this metabolic transformation.

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Section: Resultssupporting

confidence: 62%

Section: ■ Results and Discussionmentioning

confidence: 99%