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By WWII, scientists had already begun looking at alternative gelling substances for routine use in bacteriology, but concluded that agar was still better as it is both firmer and easier to handle. Today, some specialized microbiology applications use the colloid carrageenan (extracted from red seaweed Chondrus crispus, or “Irish Moss”), a more transparent and less auto-fluorescent alternative to agar (agar emits its own background fluorescence when excited by light). However, for routine bacteriological use, carrageenan is more difficult to dissolve, requires higher concentrations, can degrade at high temperatures, and forms weaker gels, which may result in puncturing its surface during the plating of cells.
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All the models featured in our instant camera buying guide are enjoyable to use, but each offers a distinct set of features at a different price point. As a result, some are more appropriate for a child or budding photographer, while others are more advanced and provide added creative control (for a price). When it comes down to it, though, we consider print quality, ease of use, and affordability to be the hallmarks of a quality shooter. That’s why we picked Fujifilm’s Instax Mini 12 as the best instant camera for most people, as it ticks all three boxes wonderfully.，详情可参考同城约会
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