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Search Results: 1 - 10 of 414821 matches for " Ahmed M. Mohamed "
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Risk Factors for Stroke in Sulaimaniyah Iraqi Kurdistan Region-Iraq  [PDF]
Ahmed Saeed Mohamed, Mohamed A. M. Alshekhani
International Journal of Clinical Medicine (IJCM) , 2016, DOI: 10.4236/ijcm.2016.79070
Abstract: Background: Stroke is a frequent medical problem and a leading cause of death and disability worldwide. Several conditions and lifestyle factors have been associated with stroke. Aim: To evaluate risk factors in stroke patients in Sulaimani city. Results: 110 patients with stroke were included in this study, hypertension was found to be the most common risk factor in current study. Out of 110 cases, 83 (75.5%) were hypertensive. Peak stroke-prone age was (60 - 69) year for male, (70 - 79) year for female. We found a statistically significant relation between level of TSC, LDL with ischemic stroke (r = 0.4047, P < 0.0001) and (r = 0.4052 P < 0.0001) respectively. While there was a significant inverse relation between HDL and ischemic stroke (Correlation coefficient = ?0.4862, P < 0.0001). On the other hand, there was no significant relation between level of TG and ischemic stroke (r = 0.2403, P < 0.0114). Also correlation statistic between TSC/HDL, LDL/HDL and result of CT scan, showed that there is statistical significance correlation between infarction and value of atherogenic index, (r = 0.5301, P < 0.0001, r = 0.4990, P < 0.0001) respectively, but there is no correlation between haemorhage & the index. Conclusion: Hypertension is the leading risk factor of stroke. It is therefore essential to detect and treat hypertension at its outset. High value of atherogenic index mostly associated with ischemic stroke .while no relation found with haemorhagic stroke.
Sol-Gel γ-Al2O3 Nanoparticles Assessment of the Removal of Eosin Yellow Using: Adsorption, Kinetic and Thermodynamic Parameters  [PDF]
Mohamed S. Thabet, Ahmed M. Ismaiel
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2016, DOI: 10.4236/jeas.2016.63007
Abstract: The adsorption behavior of eosin yellow (EY) from aqueous solution onto γ-Al2O3 nanoparticles in batch technique was studied. γ-Al2O3 NPs was prepared and characterized by SEM, TEM, XRD and FTIR analysis. The effect of pH, dosage of adsorbent, contact time, temperature, and the initial concentration of dye was investigated. The maximum amount of dye removal found about 99.36% at pH4, the adsorption dose 1g/L, with the initial dye concentration of 100 mg/L, and the temperature of 25°C, with contact time 120 min. The adsorption behavior of the eosin yellow dye is applicable to Langmuir isotherm model, with the maximum sorption capacity of 47.78 mg/g of γ-Al2O3. The kinetic data also described by the pseudo-second-order model with a correlation coefficient (0.9999), and the mechanism of the process showed a multi-linear steps and the intra-particle diffusion was not only rate controlling step. The adsorption process was endothermic with positive enthalpy of 121.8 kJ/mol, and showed spontaneous process with a mean free energy -5.19 kJ/mol, and increase randomness, 369.77 J/mol. k, at the adsorbent solution interface. The adsorption process was chemisorption in nature The activation energy estimated from Arrhenius and modified Arrhenius is 40.9 kJ/mol, 106.37 kJ/mol respectively. The sticking probability of EY onto Al2O3 NPs very high estimated from the value of S* < 1, (4.82E-19).
Bioequivalence Study of Two Oral Doxycycline Formulations (Doxysol® and Doxymed®) in Healthy Broiler Chickens  [PDF]
Ahmed M. Soliman, Mohamed Aboubakr, Mohamed El-Hewaity
Pharmacology & Pharmacy (PP) , 2015, DOI: 10.4236/pp.2015.61001
Abstract: Aims: The present study was designed to assess the comparative bio-equivalence of Doxysol® and Doxymed® in healthy broiler chickens after oral administration of both products in a dose of 20 mg doxycycline/kg.b.wt. Materials and Methods: Twenty broiler chickens were divided into two groups. The first group was designed to study the pharmacokinetics of Doxysol, while the 2nd group was designed to study the pharmacokinetics of Doxymed. Each broiler chickens in both groups were injected intravenously with 20 mg doxycycline/kg.b.wt. Blood samples were obtained from the wing vein and collected immediately before and at 5, 15, 30 minute, 1, 2, 4, 6, 8, 12 and 24 hours after a single intravenous or oral administration. Results: Doxycycline in both products obeyed a two compartments open model following I.V. injection in a dose of 20 mg/kg.b.wt. The disposition kinetics of Doxysol® and Doxymed® following oral administration of 20 mg doxycycline base/kg.b.wt. revealed that the maximum blood concentration [Cmax.] were 4.70 and 4.65 μg/ml and attained at [tmax.] of 1.30 and 1.40 hours, respectively. Doxycycline in Doxysol® and Doxymed® was eliminated with half-lives [t0.5(β)] equal to 1.98 and 2.31 hours, respectively. The mean systemic bioavailability of doxycycline in Doxysol® and Doxymed® after oral administration in healthy chickens was 92.57 and 88.21%, respectively. Conclusion: Doxymed® is bioequivalent to Doxysol® since Cmax test/Cmax reference and AUCtest/AUCreference ratios were 99% and 90%, respectively.
Molecular investigation of the Arabian horse breeds of racing, productivity and longevity  [PDF]
Mohamed M. Ahmed, Sayed A. M. Amer, Samy. M. Sayed
Advances in Bioscience and Biotechnology (ABB) , 2011, DOI: 10.4236/abb.2011.26066
Abstract: The Arabian; horse Equus caballus is belonging to family Equidae that all of its species are in danger of extinction. We sequenced 1059 nucleotides from three mitochondrial DNA protein coding genes for some breeds of the Arabian and English horses designated for race, productivity and longevity in order to investigate their genetic variation. The sequenced genes were NADH dehydrogenase subunit 2 (ND2), cyto-chrome C oxidase subunit 1 (CO1) and ATPase subunit 6 (ATP6). ATP6 discriminated among the different breeds where seven substitutions were recorded of which 2 were non-synonymous. The other loci recoded 8 synonymous substitutions of transitions most of which were among the breeds of longevity. The data of CO1 gene were used to construct the relationship of the Arabian horse to the thoroughbreds. Maximum-likelihood (ML) and Neighbor-joining (NJ) analytical methods were used. The two analytical methods showed clustering of the Arabian breeds in one group and the non-sister relationship within the thoroughbreds. One of the thoroughbreds clustered within the Arabian breeds suggesting the possibility of their out breeding. Increasing tendency in the variation of the studied genes was proportional to the utility of these genes in energy production within the mitochondria. The present study is therefore a preliminary step in the conservational efforts of the Arabian horse of equestrian..
Risk-Adapted, Combined-Modality Therapy for Unfavorable Pediatric Hodgkin Lymphom  [PDF]
Amany M. Ali, Amira M. Mohamed, Shimaa Ahmed, Mohamed Abdallah, Tarek M. Alsaba, Samar Mansour
Journal of Cancer Therapy (JCT) , 2018, DOI: 10.4236/jct.2018.97046
Abstract: Background and Objectives: Risk-adapted therapy for children with HL is directed toward high survival, minimal toxicity and optimal quality of life, with long term follow up. We assess the impact of prognostic factors associated with local treatment failure of pediatric HL patients with unfavorable criteria treated with combined modality: Alternating ABVD (Doxorubicin, Bleomycin, Vinblastine and Decarbazine) and COEP (Cyclophosphamide, Oncovin, Etoposide and Prednisone) chemotherapy and response-based, involved-field radiation for newly diagnosed unfavorable pediatric HL patients, also will detect toxicities and long-term complications observed in the patients. Methods: This prospective study was carried out from January 2010 to January 2018, with a median follow up of 74 months (range 8 - 103 months). 54 patients were eligible for this study stratified into two groups: intermediate risk (IR) and high-risk group (HR). Patients were treated with (4 - 6 cycles) and (6 - 8 cycles) respectively of alternating ABVD/COEP chemotherapy followed by involved-field radiation therapy (IFRT): 15 Gy for patients achieved complete response, and 25.5 Gy for those achieved a partial response. Results: 27 patients were IR and 27 patients were HR. There were 16 treatment failures; 5 patients had progressive disease; and 11 patients had a relapse. 9 patients died from their disease progression. The 5-year overall survival (OS) and event-free survival (EFS) rates (±SE) were 81.8% ± 5.7% and 71.8% ± 6.2% respectively. Multivariate analysis revealed that the only independent factor for inferior OS was radiotherapy. Conclusion: Treatment results of unfavourable HL patients in our study are satisfactory for with IR group but not for HR group who needs intensification of therapy. Radiotherapy is considered as a cornerstone in the treatment of the patients with unfavourable criteria with better assessment of early responders needed by PET-CT to identify patients at risk for
Heterosynthesis Using Nitriles: Novel Pyrrolo[2,3-b]pyridines  [PDF]
Fathy M. Abdelrazek, Ahmed A. Fadda, Samar S. Mohamed
International Journal of Organic Chemistry (IJOC) , 2011, DOI: 10.4236/ijoc.2011.14032
Abstract: 2-Amino-4-benzoyl-1-arylpyrrole-3-carbonitriles react with arylidene malonodinitriles, β-ketoesters and β- diketones to afford pyrrolo[2,3-b]pyridine derivatives.
Extraction of Copper from Waste Solution Using Liquid Emulsion Membrane  [PDF]
Y.T. Mohamed, Ahmed M. H. Ibrahim
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.31016
Abstract: The extraction of copper from acidic medium using Liquid Emulsion Membrane LEM as contactors was studied. b diketone LIX 54 as an extractant ,sesqueoleate which is nonionic surfactant with HLB value 3.7 and 0.1 M H2SO4 as stripping solution were used. The influence of initial concentration of copper in the aqueous feed phase, pH of external and internal aqueous phase, stirring speed, and concentration of extractant on the extraction rate was examined. The results obtained showed that practically all the copper content was removed from the acidic feed solution. The recovery of copper attained 96–100% and concentration ratios of about 40-fold could be achieved.
Crop Discrimination Using Field Hyper Spectral Remotely Sensed Data  [PDF]
Sayed M. Arafat, Mohamed A. Aboelghar, Eslam F. Ahmed
Advances in Remote Sensing (ARS) , 2013, DOI: 10.4236/ars.2013.22009

Crop discrimination through satellite imagery is still problematic. Accuracy of crop classification for high spatial resolution satellite imagery in the intensively cultivated lands of the Egyptian Nile delta is still low. Therefore, the main objective of this research is to determine the optimal hyperspectral wavebands in the spectral range of (400 - 2500 nm) to discriminate between two winter crops (Wheat and Clover) and two summer crops (Maize and Rice). This is considered as a first step to improve crop classification through satellite imagery in the intensively cultivated areas in Egypt. Hyperspectral ground measurements of ASD field Spec3 spectroradiometer was used to monitor the spectral reflectance profile during the period of the maximum growth stage of the four crops. 1-nm-wide was aggregated to 10-nm-wide bandwidths. After accounting for atmospheric windows and/or areas of significant noise, a total of 2150 narrow bands in 400 - 2500 nm were used in the analysis. Spectral reflectance was divided into six spectral zones: blue, green, red, near-infrared, shortwave infrared-I and shortwave infrared-II. One Way ANOVA and Tukey’s HSD post hoc analysis was performed to choose the optimal spectral zone that could be used to differentiate the different crops. Then, linear regression discrimination (LDA) was used to identify the specific optimal wavebands in the spectral zones in which each crop could be spectrally identified. The results of Tukey’s HSD showed that blue, NIR, SWIR-1 and SWIR-2 spectral zones are more sufficient in the discrimination between wheat and clover than green and red spectral zones. At the same time, all spectral zones were quite sufficient to discriminate between rice and maize. The results of (LDA) showed that the wavelength zone (727:1299 nm) was the optimal to identify clover crop while three zones (350:712, 1451:1562, 1951:2349 nm) could be used to identify wheat crop. The spectral zone (730:1299 nm) was the optimal to identify maize crop while three spectral zones were the best to identify rice crop (350:713, 1451:1532, 1951:2349 nm). An average of thirty measurements for each crop was considered in the process. These results will be used in machine learning process to improve the performance of the existing remote sensing software’s to isolate the

On Dislocated Metric Topology  [PDF]
Mohamed A. Ahmed, F. M. Zeyada, G. F. Hassan
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2013, DOI: 10.4236/ijmnta.2013.24032

In this paper, we give a comment on the dislocated-neighbourhood systems due to Hitzler and Seda [1]. Also, we recover the open sets of the dislocated topology.

TiO2 Nanoparticles for Removal of Malachite Green Dye from Waste Water  [PDF]
Zeinab M. Abou-Gamra, Mohamed A. Ahmed
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.53039
Abstract: In this research, we present a simple and successful route for synthesis titania nanoparticles by controlled solgel progress. Chitosan as bio-template is involved in the progress of preparation to increase the surface area and manipulate defined particle and pore structure. The crystalline behavior and the nanostructure of the prepared nanoparticles were investigated using X-ray diffraction [XRD] and transmission electron microscope [TEM]. The crystalline results have pointed out the predominant existence of anatase phase that reveals the successful role of chitosan in stabilizing titania nanoparticles and preventing the growth of these particles into rutile phase. It is obvious to notice that a change in sample crystallography from anatase to completely amorphous nanoparticles upon adsorption of malachite green dye indicates a strong adsorption of this dye that destroys the crystalline feature of titania sample. TEM analysis reveals the existence of spherical nanoparticles with size about 25 nm. The adsorption isotherm indicates the adsorption capacity 6.3 mg.g-1 TiO2. The value of enthalpy change (ΔH°) for malachite green dye adsorption is 19 kJ/mol, which indicates that the removal process is endothermic. The adsorption process follows pseudo-second order rate equation and the negative values of standard free energy (ΔG°) suggest that the adsorption process is spontaneous.
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