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Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.，更多细节参见一键获取谷歌浏览器下载
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Андрей Ставицкий (Редактор отдела «Наука и техника»)
關恆的代理律師陳闖創告訴BBC，關恆的案件有其獨特性，主要是在於他在中國的時候沒有受到直接的政治迫害，但關鍵是他的情況在離開中國之後發生變化。陳闖創指，在特朗普重新上台之後，儘管美國庇護相關的法律沒有改變，但目前是加強收緊、更嚴格地解讀各種庇護申請的案件，「確實在這個範圍內更嚴格了。」