My husband, Niall Logan, who has died aged 70 of pulmonary fibrosis, was an expert on bacillus, a genus of rod-shaped bacteria with more than 250 named species that has many uses, including as an industrial enzyme, in food production, the making of detergents and in DNA research.
One of his main contributions to the field was to help with the scientific classification (taxonomy) of bacillus, work that helped with the development of testing systems that can identify the various species.
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