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In this paradigm, aerobic respiration, denitrification, fermentation and sulfate reduction proceed in a thermodynamically determined order, known as the ‘redox tower’.

Unfortunately, many studies do not report the degree of aggregation of cells, for example, while reporting so-called ‘aerobic denitrification’ (Robertson et al., 1989; Chen et al., 2003; Takaya et al., 2003; Khardenavis et al., 2007; Su et al., 2015).

Diffusion of oxygen towards single bacterial cells is so effective that with the reported cellular respiration rates, a single aerobic cell can never deplete all the oxygen in its immediate surroundings, unless the bulk oxygen concentration is in the low nanomolar range (Schulz and Jørgensen 2001; Stolper et al., 2010).

Here, we investigated whether redox sorting of microbial processes explains microbial community structure at low-oxygen concentrations.

We subjected a diverse microbial community sampled from a coastal marine sediment to 100 days of tidal cycling in a laboratory chemostat.

In microbiology, it has long been known that at least microbial strains isolated in pure culture commonly abide to the redox tower, which is easily explained by inhibition of low redox potential processes by high potential electron acceptors.

However, non-redox tower behavior has also been observed.

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If the redox tower would apply, aerobic and anaerobic processes would occur in separate (in space or time) microcompartments.

If not, these processes would occur in parallel in the same compartment.

Fabrikken (De Danske Spritfabrikkers fabrik til produktion af Gammel Dansk i Roskilde red.) gjorde sig blandt andet bemærket, da den lokale avis Roskilde Tidende bragte en historie om en produktion, der ved en fejl havde fået for høj alkoholprocent til det danske marked.