| 11. | An early examples were derivatives of polycyclic aromatic compounds.
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| 12. | Rings can fuse with other rings on an edge to give polycyclic compounds.
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| 13. | The purine nucleoside bases are notable polycyclic aromatic heterocycles.
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| 14. | Polycyclic alkanes include cubane, basketane, and housane.
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| 15. | However, burning at low temperatures also causes increased polycyclic aromatic hydrocarbon emissions.
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| 16. | These conidia germinate in polycyclic microcycles until the end of the growing season.
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| 17. | Zoospores are biflagellate motile spores responsible for the polycyclic qualities of this disease.
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| 18. | An algebraic criterion is that the group be polycyclic.
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| 19. | Polycyclic epidemics are caused by pathogens capable of several infection cycles a season.
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| 20. | It is a polycyclic hydrocarbon, specifically a triterpene.
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