圖像來源，BBC Chinese / Lok Lee
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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加快构建新发展格局，推动高质量发展，有的干部以为发展就是上项目、搞投资、扩规模；有的过度举债搞建设，盲目扩张铺摊子；有的方式方法简单粗暴，“一刀切”；还有的搞本位主义、好大喜功、弄虚作假、推脱责任……
The trust said just 133 adult salmon were recorded returning to spawn in 2022 - the lowest figure since monitoring began in 1990.