空间太阳能电站的构想，最早由美国科学家彼得·格拉赛于1968年提出。它的工作原理与通信卫星类似：太阳能板在地球轨道上运行，通过自身旋转始终正对太阳，以最佳角度接收阳光；随后，收集到的能量以微波形式传输到地面的接收站，再转换成电能，并接入现有的电网基础设施。
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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