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.
В Мозамбике крокодилы за один день напали на двух человек на реке Лугела. Об этом сообщает издание Club of Mozambique.
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The Artemis III mission, which had been expected to land astronauts near the moon's south pole in 2028, now will be redefined and rescheduled — launching in 2027 but not to the moon, Isaacman said. Instead, the yet-to-be-named astronauts will rendezvous and dock in orbit closer to home with one or both of the commercially built lunar landers now under development at Elon Musk's SpaceX and Jeff Bezos' Blue Origin.，更多细节参见safew官方版本下载
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