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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.
Darren Connor, 55, appeared on Friday at Manchester magistrates court, where he denied possession of an offensive weapon in a public place without lawful authority or reasonable excuse.