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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週六，特朗普簽署了一項公告，改用另一項法律——1974年《貿易法》（Trade Act）中的第122條，讓他可以對所有國家的商品徵收新的10%臨時關稅。之後在同一天，他又在社交媒體上發文表示將把這些關稅提高到15%。