They carried out an array of experiments on board the orbiting lab and conducted spacewalks, with Suni breaking the record for the woman who spent the most hours outside of the space station. And at Christmas, the team dressed in Santa hats and reindeer antlers - sending a festive message for a Christmas that they had originally planned to spend at home.
By WWII, scientists had already begun looking at alternative gelling substances for routine use in bacteriology, but concluded that agar was still better as it is both firmer and easier to handle. Today, some specialized microbiology applications use the colloid carrageenan (extracted from red seaweed Chondrus crispus, or “Irish Moss”), a more transparent and less auto-fluorescent alternative to agar (agar emits its own background fluorescence when excited by light). However, for routine bacteriological use, carrageenan is more difficult to dissolve, requires higher concentrations, can degrade at high temperatures, and forms weaker gels, which may result in puncturing its surface during the plating of cells.
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19:41, 27 февраля 2026Путешествия。关于这个话题，夫子提供了深入分析