21. Isomerization reactions can also be found with specific aromatic hydrocarbons . 22. Hydrocarbons are also abundant in nebulae forming polycyclic aromatic hydrocarbon ( PAH ) compounds. 23. Novosphingobium indicum hasd the ability to degrade polycyclic aromatic hydrocarbon . 24. Among them are the polycyclic aromatic hydrocarbons , PAHs, which are known or suspected carcinogens. 25. Polystyrene, being an aromatic hydrocarbon , typically combusts incompletely as indicated by the sooty flame. 26. Alternatively, soot is produced by laser ablation of graphite or pyrolysis of aromatic hydrocarbons . 27. Crude contains varying concentrations of polycyclic aromatic hydrocarbons considered carcinogenic. 28. It is probably incompatible with amines, aromatic hydrocarbons , and ethers. 29. "' Terphenyls "'are a group of closely related aromatic hydrocarbons . 30. The chemicals are technically known as polycyclic aromatic hydrocarbons .
