For almost 16 years, Pippa Begg ran Board Intelligence as co-chief executive with Jennifer Sundberg.
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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青海都兰热水墓群出土的唐代扎经染色织物（斑布），在刘大玮团队的多重分析下揭开了扑朔迷离的身世：织物的主要原料来源于西南地区，生产则在东南和西南各地，经“认土做贡”制度被运至都城长安后，又以赏赐或贸易的形式流转至包括都兰在内的藩国、邻邦。作为陆上丝绸之路的重要见证，都兰纺织品的研究有力挑战了扎经染色织物“印度起源论”，更彰显了中华文明始终以开放的胸怀拥抱世界，在和平的商贸往来中慷慨待人的气质。