Фото: Alex Brandon / Reuters
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Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
However, because a medical degree can take five or six years to complete - longer than most other degree courses - the BMA argues resident doctors' pay should reflect the fact that they may have more student debt than other graduates.