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.
5年来，哈法亚油田持续推动工艺体系迭代升级，依托天然气处理厂等绿色项目，持续提升清洁能源供给与减排成效，同步推进植树养护、环境监测和生物多样性保护，严格落实湿地环境保护要求，以可见可感的生态实践增进当地认同，凝聚共享发展共识。
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