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.
这五年，用水方式实现深度变革。在经济总量稳步攀升的背景下，我国年用水量稳定控制在6100亿立方米以内。2025年，初步测算全国万元国内生产总值用水量、万元工业增加值用水量较“十三五”末分别下降20%和25%，节水相关产业市场规模估算超7600亿元。拧紧“水龙头”，水资源利用效率的跃升，彰显了新发展理念的生动实践。
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2026-02-27 00:00:00:0周珊珊3014251010http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142510.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142510.html11921 一针一线织出锦绣山河（人民论坛）
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