TABLE 1.

Biodegradation of crude oil components by Cycloclasticus strains

Oil componentResidual amt (SE) (%)a
Strain A5Strain H4
n-Alkanes121.6 (20.1)109.4 (20.3)
C0-naphthalene0.5 (0.6)0.4 (0.3)
C1-naphthalene2.4 (1.2)2.9 (1.5)
C2-naphthalene0.9 (0.4)1.2 (0.4)
C3-naphthalene1.2 (0.6)1.1 (0.4)
C4-naphthalene13.1 (1.5)9.6 (1.9)
C0-dibenzothiophene7.3 (2.2)6.5 (1.1)
C1-dibenzothiophene5.0 (0.8)5.7 (0.7)
C2-dibenzothiophene35.8 (3.5)23.2 (4.9)
C3-dibenzothiophene100.7 (7.4)93.5 (5.7)
C4-dibenzothiophene116.7 (8.4)115.1 (7.3)
C0-phenanthrene24.7 (9.7)42.7 (12.6)
C1-phenanthrene4.3 (1.3)5.9 (1.4)
C2-phenanthrene29.7 (2.6)17.7 (4.1)
C3-phenanthrene105.1 (5.7)93.6 (4.7)
C4-phenanthrene98.1 (6.9)100.1 (5.0)
C5-phenanthrene93.4 (4.5)96.0 (4.6)
C6-phenanthrene100.8 (5.0)98.5 (4.0)
C7-phenanthrene104.0 (3.8)112.7 (3.0)
C0-fluorene10.8 (3.7)5.8 (2.9)
C1-fluorene6.4 (2.8)7.7 (2.6)
C2-fluorene16.0 (5.1)15.1 (4.8)
  • a Cycloclasticus cultures were incubated aerobically at 25°C for 4 weeks. Sterile samples were incubated similarly and served as controls. Oil was extracted from the cultures as described in Materials and Methods.