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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.，这一点在爱思助手下载最新版本中也有详细论述
Block lays off nearly half its staff because of AI. Its CEO said most companies will do the same，更多细节参见heLLoword翻译官方下载
One of the cheapest options online，这一点在同城约会中也有详细论述