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.
'Stardew Valley's massive update lets players drink mayo, 'crit' babies, and put hats on dogs
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The river, which runs through seven US states that share it, is currently facing the worst drought in 1,200 years.
Publication date: 10 March 2026
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NHS England and counterparts in the rest of the UK are seeking to increase supplies from four other manufacturers that supply the NHS.