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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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南方周末：你提到录音室和现场的区别，在录制这套即兴曲时，是一次性完整录完，还是录了多次之后再进行选择和剪辑？
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牛刀小结曾经的 “东北药茅”，用十年时间缔造神话，却用四年时间把一手好牌打得稀烂。