https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2014.00012/full
Frontiers | Pollen and spores as a passive monitor of ultraviolet radiation
Sporopollenin is the primary component of the outer walls of pollen and spores. The chemical composition of sporopollenin is responsive to levels of ultravio...
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https://bioresources.cnr.ncsu.edu/resources/factory-mounted-and-retrofit-passive-resistance-sensors-adapted-to-monitor-moisture-content-in-timber-bridges/
Factory-mounted and retrofit passive resistance sensors adapted to monitor moisture content in...