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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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I've also removed the M1 MacBook Air as our budget pick because it's been out of stock at Walmart for several weeks. (If you need a cheap-ish MacBook, finding the M4 MacBook Air on sale is going to be your best bet.) The good news is that Apple is rumored to be launching a new low-cost MacBook very soon — see below.。业内人士推荐同城约会作为进阶阅读
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