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Articles by S.A. Omer
Total Records ( 4 ) for S.A. Omer
  Muneera Alkahtani , S.A. Omer , M.A. El-Naggar , Eman M. Abdel-Kareem and M.A. Mahmoud
  Six different abiotic elicitors (oxalic acid, potassium oxalate, salicylic acid, Bion, Fungastop and Photophor) were used to study their effect on induced resistance of cucumber (Cucumis sativus L.) against powdery mildew (Sphaerotheca fuliginea) disease. The inducers efficiency was evaluated depending on disease severity calculation and measure the biochemical change in both pathogensis Related Protein (PR) and phytoalexin accumulation in treated plants comparing with the control. Pretreatment of cucumber plants with all tested elicitors recorded a decrease in powdery mildew disease severity. Bion recorded the most effective inducers (63.8 and 72.4%) while potassium oxalate recorded the lowest effective one (37.0 and 58.3%) in both single and booster spray. Induced resistance of cucumber against powdery mildew recorded an increase in PR-proteins (peroxidase, polyphenoloxidase, Chitinase and β-1, 3 glucanase) activity as well as an increase accumulation of phytoalexins. Application of abiotic agents in these experiments enhances the induced resistance in cucumber against powdery mildew. It would therefore be the proposal to use abiotic inducers as alternatives to the fungicides and one of a wide range of disease management tools.
  S.A. Omer , A. Apio , T. Wronski and O.B. Mohammed
  The aim of this study was to describe a new species of Eimeria from Farasan gazelle which has not been described before. Faecal examination of 24 Farasan gazelles, Gazella gazelle farasani collected on Frasan Kebir (Farasan Islands, Saudi Arabia) yielded oocysts of an undescribed coccidian parasite, Eimeria farasanii n. sp. Eleven out of the 24 faecal samples (45.8%) were infected with the parasite. Sporulated oocysts of Eimeria farasanii n. sp., are ellipsoidal, flattened at micropylar end, measured 20.8±1.8x19.5±1.6 μm (19-25x18-23 μm), length/width ratio 1.07±0.05 (1.04-1.15), with smooth, double-layered oocyst wall, the inner yellow, the outer bluish green, with micropyle 3.6 μm but without a micropylar cap. Sporocyst elongate, measured 8.2±1.1x3.2±0.7 μm (7-10x2-5 μm) length/width ratio 2.6±0.5 (2-4). Stieda body present, substieda body absent. Sporocyst residuum present, consists of diffuse, coarse, refractile granules. Sporozoites elongate, measured 6.5±1.2 μm (6-8 μm), each with a small refractile body at wide end. Sporulation time 7-8 days at 25±2°C. In the present investigation Eimeria farasanii n. sp., was described from Farasan gazelle based on the morphological differences with previously described species from the genus Gazella.
  S.A. Omer , S.E.I. Adam and O.B. Mohammed
  Ethanolic and ether extracts of Commiphora myrrha were evaluated for their antimicrobial activity against two Gram negative organisms (Escherichia coli and Pseudomonas aeruginosa), two Gram positive organisms (Bacillus subtilis and Staphylococcus albus) and fungi represented by Candida albicans isolated from gazelles held at King Khalid Wildlife Research Centre, Thumamah. The method used in evaluation of the antimicrobial activity was the two-layer agar diffusion method. The ethanolic extract of C. myrrha exhibited antimicrobial activity against the Gram negative organisms investigated together with S. albus. On the other hand, the ether extract showed antimicrobial activity against Gram positive organisms investigated and against Candida albicans, with the antifungal activity being greater. The minimum inhibitory concentration of the ethanolic extract against P. aeruginosa and E. coli was found to be 20 and 40 mg mL-1, respectively. While the minimum inhibitory concentration of the ether extract against both S. albus and C. albicans was found to be 10 and 40 mg mL-1 for B. subtilis, respectively.
  O.M. Elemam , S.A. Omer , I.F. Albokhadaim and A.M. Homeida
  The study was conducted to determine withdrawal periods of intramammary preparations Curaclax (ampicillin+ceplulosporin), oxymast (oxytetracycline) and spectrazol (cefruxine) in camel and cow milk. Withdrawal periods in milk were 4 days in cows versus 5 days in camels for curaxlox and 4 days in cows versus 6 days in camel for oxmast and spectrazol. The significant (p<0.05) difference in withdrawal periods between camel and cow emphasizes the need to establish specific withdrawal periods for other drugs in the camel.
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