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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随后，几个“民警”团队轮番上阵，用多个陌生号码和龙妈妈联系，警告她：“案件保密，不能告诉任何人，尤其是你儿子。”接着，在视频通话中，骗子们出示了假警官证，假执法画面，一步步诱导龙妈妈配合“资金核查”，并要求她提供支付宝密码、银行卡号和密码。
The original plan had been to begin the phase out and stop the importation of petrol and diesel vehicles from 2030.