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Articles by Ahmed Ali
Total Records ( 7 ) for Ahmed Ali
  Ahmed Ali , Dodo Ahmadou , Bouba Adji Mohamadou , Clement Saidou and Dzudie Tenin
  Traditional fishing and fish processing are a very important activities around the Lagdo lake, Cameroon. This study was carried out to investigate the influence of traditional fish processing on the nutritional and microbiological qualities. To this effect, some physico-chemical characteristics (moisture, proteins, fats, TBA index, total ash, minerals) were determined for fresh, smoked-dried and sun dried flesh of three fish species (Tilapia nilotica, Silurus glanis and Arius parkii) while food-spoilage and pathogenic microorganisms (Escherichia coli, Staphylococcus aureus, fecal streptococci, sulfite-reducing clostridia and moulds) were screened on the same samples. Results showed that moisture content varied between 81.49±0.35 and 84.33±1.28 g/100 g for fresh fish; between 7.58±1.13 and 8.95±1.73 g/100 g for smoked-dried fish and between 11.5±0.71 and 14.06±2.11 g/100 g for sun-dried fish. For total ash, values as high as 8.13±1.55-9.86±0.24 g/100 g were recorded in smoked-dried fish while much lower values were obtained for fresh fish. With regard to protein contents, fresh fish had lower amounts between 18.81±1.55 and 21.23±1.50g/100 g while smoked-dried had the most important protein content between 69.10±2.94 and 75.72±3.66 g/100 g. All fresh fish samples showed lower fat contents than sun-dried and smoked-dried samples. Most minerals were significantly increased by sun-drying and smoking-drying. All samples appeared to be of poor microbiological quality since Escherichia coli, Staphylococcus aureus, fecal streptococci, sulfite-reducing clostridia and moulds were detected at concentrations above recommended norms.
  Walid Hamdy Kilany , Ahmed Ali , Abdel-Hamid Ismail Bazid , Mohamed Ali Zain El-Abideen and Magdy El Sayed
  Despite massive Newcastle Disease (ND) vaccination programs in Egypt several ND outbreaks were recorded since mid-2010 causing high mortalities (20-80%). The ND genotype VII Virus (vNDV) was the causative agent highlighting the need for evaluation of the efficacy of currently available and/or newly developed ND vaccines. In this study, the effectiveness of two inactivated NDV vaccines “a virulent LaSota-like (NDV/CK/Egypt/11478AF/11) (genotype II) and vNDV, (NDV/CK/Egypt/567F/12) (genotype VII) strains were evaluated. The two NDV inactivated vaccines were prepred using 350 HAU/ dose and adjuvnated with Montanide ISA 70®. Post-Vaccination (PV) antibody response was monitored on weekly basis using Hemagglutination Inhibition (HI) test against both vaccinal antigens and the vaccine potency was tested at 4 weeks PV using 106 EID50/bird of vNDV (genotype VII) strain via oculonasal route. The vNDV inactivated vaccine induced significantly higher and earlier antibody titer than the LaSota-like strain inactivated vaccine by 2 weeks PV. The LaSota-like vaccinated birds showed mild clinical signs by 2 Days Post Challenge (DPC) and 20% mortality rate. In contrast, the vNDV vaccinated birds did not show any clinical signs or mortalities. Primarily, the vNDV strain vaccine reduced virus shedding compared to the LaSota-like strain vaccinated birds that showed virus replication with relatively high titers up to 6 DPC. In conclusion, superior protection against vNDV can be achieved using the closest vaccine seed to the circulating field isolates considering the induction of higher and earlier immune response, protection against morbidity and mortality and reduction of the challenge virus shedding.
  Ahmed Ali , Ali Razzaq Abdulridha and Talib M. Abbas
  This study discovers the study effect of Aniline blue dye (ABD) addition on optical properties of polyvinyl alcohol (PVA) and Polyethylene glycol (PEG) blend. The composites samples were prepared by adding (ABD) percentages of 0, 0.013, 0.015, 0.017 and 0.020 wt. (%) to the (PVA-PEG) blend. The films were prepared by casting method with different thicknesses. The absorption noted in range of wavelength 200-800 nm. While the optical constants such as extinction coefficient, absorption coefficient, energy gap of the forbidden transition, indirect allowed, imaginary and real dielectric constants determined. The optical constants improved with improving of (ABD) concentration. The energy gap reduced with reduction the weight percentages of (ABD).
  Ahmed Ali , Dodo Ahmadou , Bouba Adji Mohamadou , Clement Saidou and Dzudie Tenin
  This study was carried out to investigate the impact of pollution of water and sediments on fish mineral and heavy metal load in Lagdo lake, Cameroon. Samples of water, sediments and 3 fish species were analyzed quantitatively for the presence of potassium (K), magnesium (Mg), sodium (Na), zinc (Zn), nickel (Ni), Cadmium (Cd) and lead (Pb) were determined using Atomic Absorption Spectrometer (AAS 50B, Australia). Results showed that major elements (K, Mg, Na) were detected in concentrations between 0.02±0.00 and 0.19±0.01 mg mL-1 in water between 0.15±0.01 and 10.95±0.08 mg g-1 in sediments and between 0.25±0.01 and 5.35±0.12 mg g-1 in different fish organs. For heavy metals (Zn, Ni, Cd and Pb), variable amounts were determined and were 0.68±0.07 to 4.96±1.23 μg mL-1 in water, 0.12±0.01 to 21.35±1.42 μg g-1 in sediments and 0.22±0.01 to 18.50±0.20 μg g-1 in fish organs. The sediment contained higher concentrations of minerals and heavy metals than water. The 3 fish species accumulated mineral and heavy metals with all elements most concentrated in the heads.
  Ibrahem Mohssin , Nedal Al-Ahmad , Ahmed Ali and Mark Troesch
  The researchers seek to find the relation between the number of training courses organized by JLIA and the number of participants and the relation between the number of participants and the type of training courses .In addition to that, the researchers also seek to investigate whether there was deterioration in the performance of JLIA in training and qualifying staff members.
  Ahmed Ali , Bouba Adji Mohamadou , Clement Saidou , Yaouba Aoudou and Clerge Tchiegang
  This research was carried out to determine physico-chemical characteristics and microbial quality of grasshoppers widely consumed in the Far North region of Cameroon where they contribute to a significant extent to food security. To this effect, morphology, moisture content, fats, proteins, total ash, minerals and some heavy metals were analyzed for fresh and fried grasshoppers purchased in local markets. Their safety was assessed through pathogenic microorganisms (bacteria and yeasts) screening using standard methods. Results showed that fresh grasshoppers were rich in protein (56.43±2.84 g/100 g dry matter) and in most minerals. The mineral contents ranged between 0.65±0.11 g/100 g DM for Zinc and 2434.45±11.06 g/100 g DM for calcium. These values witnessed slight or important decrease upon frying. Fortunately, heavy metals were not detected in both samples. However, the fresh products appeared to be highly contaminated by such bacteria as Escherichia coli, Salmonella, total and fecal coliforms, sulfite reducing clostridia, lactic acid bacteria and yeasts. If some species were not detected in fried grasshoppers, the residual bacterial population remains worrisome. This study revealed that grasshoppers could be regarded as a cheap means of nutrients in general and proteins and minerals in particular. To benefit from all their nutrients safely, the insects must be properly processed to avoid any microbial contamination.
  Ahmed Ali , Bouba Adji Mohamadou and Clement Saidou
  The present research was carried out to assess the chemical and microbiological safety of groundwater from eight sampling points in the Adamawa region of Cameroon. Some physicochemical parameters (turbidity, conductivity, alkalinity, total dissolved solids and pH) were determined using standard methods. Minerals and heavy metals were analyzed using Atomic Absorption spectrophotometer while pathogens and waterborne bacteria were screened according to reference methods. Results showed that most physicochemical parameters (pH, salinity, calcium, magnesium, chloride, sulfate and phosphate) were acceptable with regard to existing norms. However, some samples exhibited values above these norms. Turbidity and suspended matter were higher than recommended for drinking water in most samples. Fortunately, no heavy metal was detected in water from the eight localities. With regard to bacteriological safety, only one sample (Mbe) was not contaminated with pathogenic microorganisms. Those collected in Belel appeared to be contaminated by such pathogens as clostridia, Fecal coliforms, Fecal streptococci, salmonella and shigella and Staphylococcus aureus. Neither pseudomonas, nor vibrio was detected. At the whole, the study revealed that groundwater from covered wells, generally considered as safe and potable, needs to be treated prior consumption and use.
 
 
 
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