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Articles by M.A. Halablab
Total Records ( 3 ) for M.A. Halablab
  M.A. Halablab , I.H. Sheet and H.M. Holail
  The purpose of this study was to assess the microbiological quality of fresh vegetables collected from several regions in Bekaa Valley areas. A total of 63 vegetable samples irrigated from Litani River in Bekaa Valley in Lebanon namely lettuce, parsley and Malva samples and other control vegetables samples irrigated from ground water wells were examined to assess microbial contamination level. The microbiological quality of fresh vegetables ranged from 4.3 to 10.4 log10 CFU g-1 (aerobic bacteria); 2.0 to 0.71 log10 CFU g-1 (coliforns); 1.0 to 8.77 log10 CFU g-1 (E. coli) and 1.47 to 8.77 log10 CFU g-1 (S. aureus). Lettuce samples had significantly higher microbial loads including coliforms, E. coli and S. aureus than parsley samples collected from different locations in Bekaa Valley. Neither E. coli nor S. aureus had been detected on Malva samples. In addition, Barelias had higher microbial loads, coliform, E. coli and S. aureus than any other location investigated in Bekaa Valley. Moreover, E. coli was significantly higher in lettuce samples (42.30%) than in parsley samples (13.8%) and S. aureus was significantly more often detected in lettuce samples (51.5%) than in parsley samples (38%). This study demonstrated that lettuce and parsley which are usually consumed raw may contain pathogenic microorganisms and represent a risk for human health.
  M.A. Halablab , K.A.S. Mohammed and R.J. Miles

The effect of metabolic inhibitors on the growth of Campylobacter (100 human, animal and environmental isolates) was investigated. These inhibitors included β-fluoropyruvate (FP), iodoacetate (IAA, an inhibitor of gylcolysis) and α-methyl-D-glucoside (MG, a glucose analogue). In the presence of FP (0.8-1 g L-1), the growth C. jejuni was inhibited for 24 h then growth occurred efficiently. However, the growth of C. coli was reduced by more than 50% even after 72 h. The growth of C. dolyei was totally inhibited by the FP concentrations employed. In the presence of IAA (0.0048 g L-1), non of the tested species was able to grow; when half of the IAA concentration was used, C. coli grew after 24 h whereas C. jejuni grew after 48 h. On the other hand, C. dolyei was unable to grow even after 72 h. All the strains tested were relatively resistant to high concentration of MG; the growth of C. jejuni and C. doylei was completely inhibited in the presence of 50 and 40 g L-1 of MG whereas C. coli was resistant to MG concentration (70 g L-1) when grown in brain heart infusion medium. This investigation attempts to not only understand better the survival of the organism in the environment but also should assist in finding ways to control Campylobacter in the environment and the food chain and hence reduce the risk of infection to human beings.

  M.A. Halablab and A. Al-Dahlawi
  The hydrophobic nature of the outermost surface of microbial cells has been implicated in their interaction with phagocytes and attachment to host cells. The interaction between seven isolates of Legionella pneumophila, of differing virulence and n-hexadecane and n-octane was investigated. Virulent strains had a higher affinity to hydrocarbons than avirulent strains. The hydrophobicity of strains appeared to be related to LD50 hyperbolically and an empirical expression relating the two variables was derived. This report extends the use of microbial adherence to hydrocarbons (MATH) as a possible tool for distinguishing between pathogenic and non-pathogenic Legionella strains. In the context of this study, the terms hydrophobic Legionella and hydrophilic Legionella are used to indicate the affinity of the organism to hydrocarbons.
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