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.
他把专家请进来，带干部走出去。县里组建了11个专题组，用3个月时间对全县商品经济的现状和前景进行了全面深入的调查和分析。最终，他创造性提出了“半城郊型”经济发展的新路子。
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Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36