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.
這場國情咨文報告現場反應兩極:特朗普點名稱民主黨議員「瘋了」,如在兒童性別醫療議題上嘲笑未鼓掌者。台下的明尼蘇達州民主黨眾議員伊爾漢·奧馬爾(Ilhan Omar)大喊「特朗普是騙子」;德州眾議員阿爾·格林(Al Green)早前抗議被護送離場。民主黨的維吉尼亞州長阿比蓋爾·斯潘伯格(Abigail Spanberger)批評特朗普「說謊、找替罪羊、分散注意力」,未提供實質解決方案,指其移民政策撕裂家庭、將肯尼迪中心改名為特朗普-肯尼迪中心,不符建國者願景。她以三問結尾:「總統是否讓生活更負擔得起?是否保障國內外安全?是否為你而工作?」皆答「否」。加州參議員亞歷克斯·帕迪拉(Alex Padilla)以西班牙語回應,批評移民政策「非法」,呼籲選民選擇團結而非分裂。
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