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Articles by Mohamed Hammami
Total Records ( 4 ) for Mohamed Hammami
  Faten Brahmi , Guido Flamini , Madiha Dhibi , Maha Mastouri and Mohamed Hammami
  The aims of this study was to analyze the chemical composition of fruits and stem volatile oils of Olea europaea L. cv. Chemchali and to test the efficacy of volatile oils against four pathogenic bacteria and four phytopathogen strains and their antioxidant activity. The GC-MS analysis revealed 38 compounds representing 88.5 and 73.6% of the total oils containing 3-ethenylpyridine (12.5%), (E)-2-decenal (11.4%) and 2-ethylbenzaldehyde (7.7%) in fruit and nonanal (9.9%), (E)-2-decenal (9.6%) and benzyl alcohol (9.00%) in stem as major components, respectively. The antibacterial and antifungal activities of stem volatile oils were relatively good. Therefore, the stem of Olea europaea L. demonstrated higher activities against tested fungi and bacteria than the fruit. The DPPH and ABTS-radical-scavenging activities of the oils showed that the lowest EC50 value was detected in volatile oil from fruit.
  Raja Chaaba , Nebil Attia , Sonia Hammami , Maha Smaoui , Khaldoun Ben Hamda , Sylvia Mahjoub and Mohamed Hammami
 

Background

The relationship between apolipoprotein E (ApoE) polymorphism, fasting lipid parameters, and coronary artery disease (CAD) is controversial.

Methods

We studied this relationship, for the first time, in Tunisian type 2 diabetic patients. The studied population comprised 157 type 2 diabetic patients (145 of them were not on any lipid-lowering drugs). Fasting lipids were measured by enzymatic methods and ApoE genotypes were determined by polymerase chain reaction-restriction fragment length polymorphism.

Results

Our results showed that the alleles E2, E3, and E4 were found in 4%, 88%, and 8% of patients, respectively. In the total type 2 diabetic population, no association was found between ApoE polymorphism, lipid parameters, and CAD. However, the E4 allele was associated with elevated low-density lipoprotein cholesterol concentration and with CAD in type 2 diabetic men.

Conclusion

The effect of ApoE polymorphism on CAD is gender-dependent in the Tunisian type 2 diabetic population. ApoE 4 allele may enhance atherogenesis indirectly by a strong effect on low-density lipoprotein cholesterol.

  Imed Rjiba , Samia Debbou , Nouredine Gazzah , Imed Chreif and Mohamed Hammami
  Virgin olive oil is a unique oil that can be consumed directly without any refining process. This particularity is due to the exceptional quality and flavour formed by the presence of more than 100 volatile compounds. Nine new hybrids obtained by controlled crossing of the Chemlali and seven ancient Mediterranean varieties cultivated in the same orchard under identical agronomic and pedoclimatic conditions were characterised by their main volatile compounds quantified by dynamic headspace-gas chromatography-MS. More than 40 volatile compounds from the main chemical groups, aldehydes, alcohols, ketones and esters, were identified by GC-MS and confirmed by their Linear Retention Index (LRI). Compounds produced from the lipoxygenase pathway were studied to determine the genetic potential and the influence on each crossing. Finally, Ward’s method test and Pearson PCA analysis were used to check the ability of the volatiles to cluster the varietal virgin olive oils according to their genetics origin.
  Faten Brahmi , Hechmi Chehab , Guido Flamini , Madiha Dhibi , Manel Issaoui , Maha Mastouri and Mohamed Hammami
  The olive tree is generally grown under rain-fed conditions. However, since the yield response to irrigation is great, even with low amounts of water, there is increasing interest in irrigated agriculture. The main goal of this study was, therefore, to investigate the effect of irrigation regimes on olive (Olea europaea L., cv. Koroneiki) obtained from an intensively-managed orchard in a semi-arid area with a Mediterranean climate in Tunisia. Different irrigation treatments 50% ETc, 75% ETc and 100% ETc were applied to the olive orchard. Accordingly, the effects of three irrigation regimes on volatile compounds, fatty acid composition and biological activities of Koroneiki cultivar were studied. The total profile of the volatile constituents of all samples revealed the predominance of 3-ethenylpyridine (from 14.9-19.6%), phenylethyl alcool (from 7.8-19.2%) and benzaldehyde (from 9.0 to 13.8%). During watering level treatments studied, the major fatty acids were oleic, palmitic and linoleic. Antioxidant activity of the fresh fruit volatiles cultivated at a watering level of 100% ETc was higher than that obtained under 50 and 75% Etc. The results of antifungal activity showed that the fruits volatiles of the three irrigation treatments had varying degrees of growth inhibition against the microorganisms tested.
 
 
 
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