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Agar’s low viscosity also makes it easy to pour into Petri dishes, and its transparency permits observation of microbes growing on its surface.7 Also aiding in this is its low syneresis (extrusion of water from the gel), guaranteeing less surface “sweating”: Once a plate is inoculated, bacterial colonies stay in place and do not mix.
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2021—2025 年度，无论披露研发投入的企业数量/占比，还是研发投入总额/平均值，都呈整体上升趋势。
But for many North Korea watchers, the Workers’ party congress – held over several days just once every five years – was a rare opportunity to speculate over the identity of the country’s future leader.
这种 “把鸡蛋放一个篮子里” 的玩法，在政策和竞争的双重冲击下，注定不堪一击。