This is one of five facilities on the icy continent run by the British Antarctic Survey (BAS), the UK's polar research institute.
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.
，更多细节参见搜狗输入法下载
Ранее стало известно, что власти США призвали американских граждан в срочном порядке покинуть Израиль в связи с угрозой возобновления войны с Ираном. Вашингтон также разрешил американским госслужащим, «чья работа не является критически важной», и их семьям покинуть страну.
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