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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Fast food workers in California are demanding employers sign a pledge reaffirming workers’ rights amid Immigration and Customs Enforcement (ICE) raids at workplaces across the US.
贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。
The Natterer's come out a little later, preferring to exit through small holes in the roof to get outside and find food.