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It’s also worth noting that even if alternatives superior to agar were found, scientists are reluctant to abandon established protocols (even when microbiologists do use other jellies, they often still add agar to the mix, for example, to increase the gel strength of the solid media). As agar has been the standard gelling agent in microbiology for around 150 years, an enormous infrastructure of standardized methods, reference values, and quality control procedures has emerged around its specific properties. Switching to a different medium (even a superior one) means results may not be directly comparable to decades of published literature or to other laboratories’ findings.
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The answer was the US Navy, which was hungry for new pilots after World War Two. It was not building rockets but at least it involved flying.
包括交通部长肖恩·达菲在内的政府官员表示，关闭空域是因为墨西哥贩毒集团操控的无人机侵犯了美国领空。然而其他知情人士则表示，真正的原因是国土安全部在未与联邦航空管理局协调的情况下，使用了五角大楼的激光系统。