The concept of a bacterium

@article{Stanier2004TheCO,
  title={The concept of a bacterium},
  author={Roger Y. Stanier and C. B. van Niel},
  journal={Archiv f{\"u}r Mikrobiologie},
  year={2004},
  volume={42},
  pages={17-35}
}
Since the earliest days of microbiology, the biological nature and relationships of the bacteria have been subjects of perennial discussion. Why have these questions obsessed some members of each succeeding generation of microbiologists ? There can be no doubt about the principal reason. Any good biologist finds it intellectually distressing to devote his life to the study of a group that cannot be readily and satisfactorily defined in biological terms; and the abiding intellectual scandal of… 
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