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.
东坝大马灯起源于唐代，灵感源于汉代“骆驼载乐”的表演形式。到了明代，已是商贸重镇的东坝虽庙会繁盛，但春节期间大型娱乐活动匮乏，当地结合水乡多船少马的特点，以竹为骨、绒为皮，饰以马鞍缰绳、铜铃等，创制出可由两人共驭的巨型竹马。演出时，随着乐器伴奏，马队交替布阵，扮演刘备、关羽、张飞等三国人物的演员跃马出征，逐渐形成“七马出征”的固定阵型，成为“江南一绝”。2008年，东坝大马灯入选国家级非物质文化遗产名录。，推荐阅读91视频获取更多信息
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They warn that as SpaceX chief Elon Musk pledges to launch one million satellites in the coming years, this contamination could be the tip of the iceberg.
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