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- W2930961956 endingPage "2004" @default.
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- W2930961956 abstract "Anaerobic ammonia-oxidizing (Anammox) bacteria (AnAOB) rely on nitrite supplied by ammonia-oxidizing bacteria (AOB) and archaea (AOA). Affinities for ammonia and oxygen play a crucial role in AOA/AOB competition and their association with AnAOB. In this work we measured the affinity constants for ammonia and oxygen (half-saturation; km) of two freshwater AOA enrichments, an AOA soil isolate (N. viennensis), and a freshwater AnAOB enrichment. The AOA enrichments had similar kinetics (μmax ≈ 0.36 d-1, km,NH4 ≈ 0.78 µM, and km,O2 ≈ 2.9 µM), whereas N. viennensis had similar km values but lower μmax (0.23 d-1). In agreement with the current paradigm, these AOA strains showed a higher affinity for ammonia (lower km,NH4; 0.34-1.27 µM) than published AOB measurements (>20 µM). The slower growing AnAOB (μmax ≈ 0.16 d-1) had much higher km values (km,NH4 ≈ 132 µM, km,NO2 ≈ 48 µM) and were inhibited by oxygen at low levels (half-oxygen inhibition; ki,O2 ≈ 0.092 µM). The higher affinity of AOA for ammonia relative to AnAOB, suggests AOA/AnAOB cooperation is only possible where AOA do not outcompete AnAOB for ammonia. Using a biofilm model, we show that environments of ammonia/oxygen counter diffusion, such as stratified lakes, favors this cooperation." @default.
- W2930961956 created "2019-04-11" @default.
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- W2930961956 date "2019-04-01" @default.
- W2930961956 modified "2023-10-17" @default.
- W2930961956 title "Affinity informs environmental cooperation between ammonia-oxidizing archaea (AOA) and anaerobic ammonia-oxidizing (Anammox) bacteria" @default.
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- W2930961956 doi "https://doi.org/10.1038/s41396-019-0408-x" @default.
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