2016
DOI: 10.1038/srep27576
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Assessment of Heterotrophic Growth Supported by Soluble Microbial Products in Anammox Biofilm using Multidimensional Modeling

Abstract: Anaerobic ammonium oxidation (anammox) is known to autotrophically convert ammonium to dinitrogen gas with nitrite as the electron acceptor, but little is known about their released microbial products and how these are relative to heterotrophic growth in anammox system. In this work, we applied a mathematical model to assess the heterotrophic growth supported by three key microbial products produced by bacteria in anammox biofilm (utilization associated products (UAP), biomass associated products (BAP), and de… Show more

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Cited by 24 publications
(18 citation statements)
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“…None of the neighboring population genomes encoded genes for the synthesis of cobalamin (vitamin B12), while B-vitamin biosynthesis genes were encoded in the anammox genomes (AMX1 and AMX13), suggesting that anammox bacteria may support B-vitamin requirements for members of the flanking community in both bioreactors. The breakdown of extracellular polymeric substances (EPS) produced by anammox and other bacteria has been suggested to be a primary source of organic carbon for heterotrophic bacterial growth in anammox bioreactors (Hou et al, 2015 ; Liu et al, 2016 ; Lawson et al, 2017 ). The flanking community in the reactors (mainly, belonging to phylum Ignavibacteriae, Chlorobi, and Chloroflexi) encoded proteins required for transport of peptide and amino acids ( Figure 3C ), which may suggest that these flanking community members have been selected to degrade peptides, amino acids and EPS produced by anammox bacteria.…”
Section: Resultsmentioning
confidence: 99%
“…None of the neighboring population genomes encoded genes for the synthesis of cobalamin (vitamin B12), while B-vitamin biosynthesis genes were encoded in the anammox genomes (AMX1 and AMX13), suggesting that anammox bacteria may support B-vitamin requirements for members of the flanking community in both bioreactors. The breakdown of extracellular polymeric substances (EPS) produced by anammox and other bacteria has been suggested to be a primary source of organic carbon for heterotrophic bacterial growth in anammox bioreactors (Hou et al, 2015 ; Liu et al, 2016 ; Lawson et al, 2017 ). The flanking community in the reactors (mainly, belonging to phylum Ignavibacteriae, Chlorobi, and Chloroflexi) encoded proteins required for transport of peptide and amino acids ( Figure 3C ), which may suggest that these flanking community members have been selected to degrade peptides, amino acids and EPS produced by anammox bacteria.…”
Section: Resultsmentioning
confidence: 99%
“…This activity could contribute to the removal of excess nitrate produced from the system during anammox growth or nitrite oxidation by NOB. Hydrolysis of EPS into soluble compounds and/or the secretion of soluble microbial products by anammox bacteria during cell growth is believed to support denitrification and heterotrophic growth, particularly for anammox bioreactors that receive no external organic carbon substrates 17 18 . However, the specific metabolite exchange reactions promoting interactions between heterotrophic and anammox bacteria remain poorly understood.…”
mentioning
confidence: 99%
“…Chlorobi and Chloroflexi are proposed to degrade the organic molecules or the secretion of soluble compounds during cell growth. 38,39 The correlation analysis between microbial community structure and COG functions (Figure 4) showed an upregulation of relative abundance in genera Anaerolineaceae and Lgnavibacteria. They both associated with COG functions of amino acid transport and metabolism.…”
Section: ■ Discussionmentioning
confidence: 99%