For construction of growth curves, pure isolates were
cultured at 32 1C for 0, 24, 48 and 72 h under aerobic
conditions (rotatory shaker, 150 rpm) in liquid BH
medium amended with 0% or 0.1% w/v of hydrocarbons.
Overnight culture of each bacterial strain
grown in NB was harvested by centrifugation
(10,000 g, 10 min) and resuspended in sterile phosphate
buffer (150 nM, pH 7) to yield an optical density of 0.6
at 660 nm. Aliquots (0.5 ml) of the cell suspensions were
transferred to 250 ml Erlenmeyer flaks containing 50 ml
of BH medium amended with naphthalene, phenanthrene,
fluoranthene or pyrene. Platable cell counts were
estimated by the dilution plate technique (three replicates
from each dilution) using TSA (Difco). The
inoculated agar plates were incubated at 32 1C for 72 h
before colonies were counted.
For construction of growth curves, pure isolates werecultured at 32 1C for 0, 24, 48 and 72 h under aerobicconditions (rotatory shaker, 150 rpm) in liquid BHmedium amended with 0% or 0.1% w/v of hydrocarbons.Overnight culture of each bacterial straingrown in NB was harvested by centrifugation(10,000 g, 10 min) and resuspended in sterile phosphatebuffer (150 nM, pH 7) to yield an optical density of 0.6at 660 nm. Aliquots (0.5 ml) of the cell suspensions weretransferred to 250 ml Erlenmeyer flaks containing 50 mlof BH medium amended with naphthalene, phenanthrene,fluoranthene or pyrene. Platable cell counts wereestimated by the dilution plate technique (three replicatesfrom each dilution) using TSA (Difco). Theinoculated agar plates were incubated at 32 1C for 72 hbefore colonies were counted.
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