Abstract
To establish the bioremediation process for marine oil spill, it is necessary to know microbial reaction for degrading individual hydrocarbons. Petroleum hydrocarbons are generally ranked in the following order of susceptibility to microbial attack : n-alkanes>low molecular-weight aromatics>cyclic alkanes>asphaltenes and resins. This part describes metabolic pathways of n-alkanes and aromatic hydrocarbons in detail.