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.
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秘鲁经济曾经历一段真正的黄金时期，国际媒体一度把它称为“拉美明星”“安第斯之虎”。一切似乎都在向好，但好景不长。2013年前后，增长开始明显放缓：2001—2013年GDP年均增长约6.1%，而2013—2019年却降至约3.1%，几乎腰斩。