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.
If you’re looking for an instant camera that offers the most old-fashioned, instant-film experience, the Polaroid Flip is the camera for you. It resembles vintage instant cameras like the Polaroid 600 more than any other camera on our list, thanks to its classic, retro-inspired design and flip-up lid. Its square I-Type film prints and iconic white frame give photos an authentically vintage look, while modern touches like Bluetooth, USB-C charging, and a beginner-friendly companion app add greater convenience and creative control.
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（九）征集负面线索。以“代理维权举报”等名义，公开征集涉地方、企业、单位、他人负面信息或商业秘密，用于抹黑攻击、敲诈勒索。
第四十三条 当事人约定由三名仲裁员组成仲裁庭的，应当各自选定或者各自委托仲裁机构主任按照仲裁规则确定的程序指定一名仲裁员；第三名仲裁员由当事人共同选定，也可以由当事人共同委托仲裁机构主任按照仲裁规则确定的程序指定。当事人约定第三名仲裁员由其各自选定的仲裁员共同选定的，从其约定。第三名仲裁员是首席仲裁员。