Effect of some plant extracts on some pathogenic bacteria

الملخص

Effect of some plant extracts on some pathogenic bacteria

          Theis study was concerned with the antimicrobial effect in vitro of aqueous and ethanolic extracts of three species of plants (Chlorocyperus  rotundus  L., Dianthus  chinensis L.and Glycyrrhiza  glabra L.)were assayed against four species of pathogenic bacteria  (Escherichia  coli ,Proteus  mirabilis, Staphylococcus  aureus and Streptococcus pyogenes ).All isolates were sensitive to aqueous and ethanolic extracts of( Dianthus chinensis L.)singly  and all combination except aqueous extracts of (Chlorocyperus  rotundus L.,Dianthus  chinensis L.and Glycyrrhiza  glabra L.)did not inhabit any of the test organisms.The aqueous and ethanolic extracts of (Chlorocyperus  rotundus L. singly did not inhibit of gram-negative or ganism , so the aqueous and ethanolic extracts of(Glycyrrhiza  glabra L.) singly did not inhibit gram-positive organism .The highest inhibition zone of 16 mm was observed with a combination of extracts on Streptococcus  pyogenes.

key words: Antimicrobic ,Concoctions,Pathogenic ,susceptibility.