Selective carbon sources influence the end products of nitrate respiration in microbial enrichment cultures To enrich for nitrate-respiring microbial communities from samples of aquatic sediment, agricultural soil, and groundwater, we inoculated them into a medium with 20 mM sodium nitrate as the electron acceptor and 2 g/L yeast extract as the carbon source and electron donor, and we […] More
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Simulation overview All simulations take place in a one-dimensional circular array, occupied by a specified number of trees (n), each with a unique community of root-associated microbial pathogens and mutualists. We chose to conduct the simulations in one dimension to simplify interpretation, but we recognize that simulation dynamics likely progress more slowly than they would […] More
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Modeling emerging populations in turbulent flows We consider a population of biological organisms in a moving fluid (Fig. 1). We are particularly interested in the problem of cooperation at very small scales, from tens of nanometers (e.g., small replicating RNA strands) to microns (e.g., single-celled organisms). Even at these small distances, the fluid can be described […] More
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1. Li, L., Tilman, D., Lambers, H. & Zhang, F. S. Plant diversity and overyielding: insights from belowground facilitation of intercropping in agriculture. New Phytol. 203, 63–69 (2014). 2. Tilman, D., Reich, P. B. & Knops, J. M. Biodiversity and ecosystem stability in a decade-long grassland experiment. Nature 441, 629–632 (2006). 3. Isbell, F. et […] More
