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Articles by Rasha S. Ahmed
Total Records ( 1 ) for Rasha S. Ahmed
  Rasha S. Ahmed and Sanaa O. Yagoub
  Petroleum ether, methanol and water extracts of Psidium guajava leaves were tested to determine their possible antimicrobial activity against Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative bacteria (E. coli and Salmonella typhi) and fungi (Aspergillus niger and Candida albicans). Each extract was used in concentration of 100, 50, 25 and 10%. Gram-positive and Gram-negative bacteria showed susceptibility toward all extracts, the zones of their inhibition ranged between (13-28 mm). Aspergillus niger showed complete resistance toward all extracts at all concentrations while Candida albicans was inhibited by water extract, all concentrations of petroleum ether extract and only concentration at 10% of methanol extract, the zones of inhibition ranged between (13-20 mm).
 
 
 
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