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.
2025年，上证指数全年累计上涨18.41%，创最近6年来最大年度涨幅，创最近6年以来新高，上证指数最终报收3968.84点，深证成指全年上涨29.87%，创业板指全年上涨49.57%。北证50、科创综指年线分别上涨39.78%和46.30%。沪深300指数累计上涨17.66%。
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Researchers and academics developing experimental applications
Cash handling is fraught with peril. Bills are fairly small and easy to hide,