In this paper, professor Gabriel Perron and the team tested a particular hypothesis about the mechanisms of bacterial evolution, and found that the data did not support this hypothesis. It is a really nice example of a publication that faithfully presents important negative results, when an attractive, logical, and perfectly plausible hypothesis has to be rejected based on experimental evidence.
Citation: McLeman, A., Sierocinski, P., Hesse, E., Buckling, A., Perron, G., Hülter, N., … & Vos, M. (2016). No effect of natural transformation on the evolution of resistance to bacteriophages in the Acinetobacter baylyi model system. Scientific Reports, 6.
Link to full text: http://www.nature.com/articles/srep37144