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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.，这一点在夫子中也有详细论述
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丽呈和艺龙也在去年同步稳增，前者在营门店数量达到829家，同比增长34.14%；后者在营门店数量达到2340，同比增长1.34%，共同构成腰部力量的坚实支撑。