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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Tenting and negative tilt
還有年紀相若的業主曾言，「你給我足夠的數目，我即走。」小陳相信有一部分長者業主會接受這個選項，「再等下去，人都走了（去世了）」。根據2021年香港人口普查，宏福苑的居住人口為4643人，其中有三成人為65歲以上的長者，居民年齡中位數為56.6。
The new Powerbeats Fit are the direct successors to 2022’s popular Beats Fit Pro, costing £200 (€230/$200/A$330). They sit alongside the recently redesigned Powerbeats Pro 2 as Apple’s fitness alternatives of the AirPods.