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Microbialbiotechnologyinthelaboratoryandinpractce
Onlyasmallnumberofsoilbacteria(0.01-0.3%)arecapable
ofusinghydrocarbonsassolesourceofcarbonandenergy.
Screeningmethodsareveryusefulinisolatingmicroorganisms
capableofdegradingxenobiotics.Theeasiestwaytodothisisto
takeasoilsampleandperformaninoculationfromappropriate
dilutionsonselectivemediawiththeadditionofxenobiotics
asasourceofcarbonandenergy.Growingcoloniesarethen
isolatedandcheckedfortheirdegradationactivity.
Fig0102040
Biotransformafion
ofbenzeneby
flamentousfungi.
PRACTICALPART
Materialsandmedia
1.
Sourceofisolatedbacteria:gardenandmeadowsoil,as
wellassoilsamplestakenfromtheareaofadairy,agas
stationorfreeway.
2.Microorganisms:
a)Strainsisolatedfromsoilsamples;
b)
Referencebacterialstrains:Staphylococcus
aureusATCC6538,EscherichiacoliATCC25922,
PseudomonasaeruginosaATCC15442.
3.
Solidmedia:agar,ZTmedium,universal,maltose,
universalwithanthraceneandphenanthrene(0.1g/l),
mediumwithmilk,withstarch,Tween80.
4.Reagents:anthracene,phenanthrene.
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