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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.
What to do if you get or trigger an Instagram alertFor parents who receive an alert, Ackerman recommended remaining calm and acknowledging that it may be difficult to hear, especially if the notification is unexpected. Ackerman added that parents don't need to try to fix everything in the moment. Instead, they should focus on being present for their teen and determining next steps while making their support clear. (Ackerman suggests these tips for talking about suicide from The Kids Mental Health Foundation.)
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