الفهرس 
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Abstract
Two types of microorganisms are of particular interset in the biodegration of natural and synthetic polymers these are bacteria and fungi where the bacteria include the general bacteria and actiomycetes chandra and fungi 1998 kleebrg 1999 el badan 2002 belal 2003 clabia and tokiwa 204 ghanem et al 2005 several studeis have investigated the biodegradability of natural mabrouk and sabry 2001 el badan 2002 ghanem el al 2005 as well assuch syntheticalipatic and aliphatic aromatic copolyesters witt 1996 witt el al 1995 1997 1999 keeebrg 1999.