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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只是，陸乾坤沒有想到，特朗普上台之後，會對無證移民造成如此巨大的衝擊。這段時間，即使沒有遭到執法上的實際影響，但他坦言ICE的執法行動讓他構成了心理上的負擔和壓力，也對華人社群帶來一定的影響。，这一点在WPS下载最新地址中也有详细论述