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.
在办理过程中，各部门深入学习贯彻新修改的代表法和新修订的政协提案工作条例等，领会把握健全工作机制、密切沟通交流、督促跟踪落实、强化成果转化等环节的新要求，提升建议提案办理质效。
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Nancy Guthrie, 84, was abducted from her home near Tucson, Arizona, prompting a widespread search and appeals from her family.
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In simple terms, the ATM's small display (called a VDU or Video Display Unit in