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.
历史告诉我们，台湾的史前先民与华南闽浙粤沿海一带先民一脉相承，华南先民是史前台湾最早的先民。历史文献可见，中国人最早关注台湾，最早记录台湾的居民和地理，最早开发台湾，最早命名台湾的地名。中国政府最早在澎湖设治，兼管台湾。据明万历年间绘制的《福建海防图》，明朝人已经认识并清楚记录了台湾周边20多个居民点。显然，这些居民点都是大陆去的中国人命名的。“台独”历史学家说明朝人对台湾还没有什么认识，显然是一种历史虚无。“台独”理论家说台湾自古以来就是一个国家，结果找不出任何一条文献史料来证明，完全是没有任何历史根据的臆想。
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