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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.
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After 32 weeks in hospital, several cardiac arrests and a quadruple amputation, sepsis survivor Manjit Sangha has finally returned home.。体育直播是该领域的重要参考
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Москалькова заявила о новых условиях Киева для возвращения россиян с территории Украины14:51