It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.
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Lisa Barker, from Oldham, contacted Action Fraud, which is run by the City of London Police, after losing £1,508 for eight tickets.
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