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.
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相比之下，三個月前何衛東落馬時為「五宗罪」，且措辭和定性都要比張又俠弱得多。
Фото: Oleg Petrasiuk / Press Service of the 24th King Danylo Separate Mechanized Brigade of the Ukrainian Armed Forces / Handout / Reuters