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