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导读 示踪剂, 为观察、研究和测量某物质在指定过程中的行为或性质而加入的一种标记物。 作为示踪剂,其性质或行为在该过程中与被示剂物应完全相同或差别极小。其加入量应当很小,对体系不产生显著的影响。此外,示踪剂必须容易被探测。 Going underground 深入地底 A new job for DNA DNA新用途 Nature’s favourite information-carrying molecule is put to work mapping subterranean resources 让最受大自然宠爱的信息携带分子帮助人们探索地下资源情况 From the print edition | Science and technology Mar 16th 2017 WHAT lies beneath? It is a pressing question for those prospecting for oil, planning shale -fracturing or seeking geothermal-energy sites. Underground reservoirs of water, oil and gas are connected in extens
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