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Search Results: 1 - 10 of 3159 matches for " Abdel Salam Hamdy "
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Microstructure, Corrosion, and Fatigue Properties of Alumina-Titania Nanostructured Coatings  [PDF]
Ahmed Ibrahim, Abdel Salam Hamdy
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2011, DOI: 10.4236/jsemat.2011.13015
Abstract: Air Plasma spray process was used to deposit a conventional and nanostructured Al2O3-13 wt% TiO2 coatings on a stainless steel substrates. Morphology of the powder particles, microstructure and phase composition of the coatings were characterized by XRD and SEM. Potentiodynamic polarization tests and Electrochemical Impedance Spectro- scopy (EIS) were used to analyze the corrosion of the coated substrate in 3.5% NaCl solutions to determine the opti-mum conditions for corrosion protection. The fatigue strength and hardness of the coatings were investigated. The experimental data indicated that the nanostructured coated samples exhibited higher hardness and fatigue strength compared to the conventional coated samples. On the other hand, the conventional coatings showed a better localized corrosion resistance than the nanostructured coatings.
Electrochemical Impedance Spectroscopy Study of the Corrosion Behavior of Some Niobium Bearing Stainless Steels in 3.5% NaCl
Abdel Salam Hamdy, E. El-Shenawy and T. El-Bitar
International Journal of Electrochemical Science , 2006,
Abstract: Electrochemical Impedance Spectroscopy (EIS) is a powerful, rapid and accurate non-destructive method for the evaluation of wide range of materials. In this work, the corrosion behavior of some austenitic stainless steels was studied in 3.5%NaCl. The effect of Nb content and cold deformation on the corrosion resistance was investigated. The occurrence of localized corrosion due to chloride ion attack was examined by visual inspection and SEM-EDS. XRD analysis was used to identify the chemical composition of the outer oxide layer. According to EIS, the corrosion resistance increased by increasing the Nb content. Cold deformation (CD) has a critical effect on the corrosion resistance. The specimens prepared at 23% CD showed the best corrosion resistance. The surface resistance increased double compared with that without CD. Increasing the deformation to 40% and 50% affects negatively the corrosion resistance. XRD reveled presence of Cr-rich film in the specimen bearing the highest Nb-content. It is argued that increasing the Nb-content enhancing formation of surface film enriched with Cr and Ni which has a high corrosion resistance.
Significance of Personal Exposure Assessment to Air Pollution in the Urban Areas of Egypt  [PDF]
Mahmoud M. M. Abdel-Salam
Open Journal of Air Pollution (OJAP) , 2015, DOI: 10.4236/ojap.2015.41001
Abstract:

Air pollution, both indoor and outdoor, has been found to be related to serious adverse health effects. Accurate estimation of air pollution exposure has become very important to suggest proper air pollution control policies and to further assess the effectiveness of these policies. In many instances, personal exposures have been found to be greater than concentrations measured at fixed site monitoring stations. As people spend most of their time indoors particularly during harsh weather conditions, it is necessary to consider indoor air quality in exposure assessment studies. The current paper focuses on the importance of personal exposure assessment based on spatial and temporal activity patters both indoors and outdoors.

Correlation between risk factors during the neonatal period and appearance of retinopathy of prematurity in preterm infants in neonatal intensive care units in Alexandria, Egypt
Abdel Hadi AM,Hamdy IS
Clinical Ophthalmology , 2013,
Abstract: Ahmed Mahmoud Abdel Hadi, Islam Shereen HamdyDepartment of Ophthalmology, Alexandria University Hospital, Alexandria, EgyptBackground: This study aimed to identify the main risk factors for development of retinopathy of prematurity (ROP) in neonatal intensive care units in Alexandria, Egypt, from January 2010 to January 2012.Methods: A prospective cohort study was undertaken in infants weighing < 1250 g and maternal postmenstrual age < 32 weeks if there was concern about prolonged exposure to oxygen. The main clinical outcomes were occurrence of any stage of ROP and in particular severe ROP. Perinatal variables considered were: birth weight, gestational age, gender, method of ventilation (nasal continuous airway pressure or intermittent mechanical ventilation), packed red blood cell and/or plasma transfusion, occurrence of sepsis, neonatal indirect hyperbilirubinemia, intraventricular hemorrhage, and patent ductus arteriosus. After obtaining informed consent from the parents, infants at risk were examined for ROP using indirect ophthalmoscopy, ie, RetCam II fundus photography.Results: The study included 152 infants of mean gestational age 31.02 weeks and mean birth weight 1.229 kg. Seventy-two cases (47.5%) were male and 80 cases (52.5%) were female. Of the cases screened, 100 (65.6%) had no ROP, 52 had ROP of any stage (34.4%), and 27 (18%) had stage 1, five (3.3%) had stage 2, 17 (11.5%) had stage 3, and three (1.6%) had stage 4 disease. No infants had stage 5 ROP. Of all our cases with ROP, 15 (28.6%) had prethreshold disease type 1 that required treatment, comprising 9.8% of all cases screened for ROP. Using stepwise logistic regression analysis, all risk factors studied were found to be significantly associated with the development of ROP, except for neonatal indirect hyperbilirubinemia. Severity of ROP was inversely proportional to birth weight and gestational age.Conclusion: ROP occurred in 34.4% of all infants screened in the neonatal intensive care units at three obstetric hospitals in Alexandria. The main risk factors for development of threshold ROP by regression analysis were low birth weight, gestational age, method of ventilation, need for packed red blood cell and/or plasma transfusion, occurrence of sepsis, intraventricular hemorrhage, and patent ductus arteriosus but not neonatal indirect hyperbilirubinemia. We suggest that both immaturity and compromised pulmonary function are both important etiological factors in the development of ROP.Keywords: retinopathy of prematurity, premature infant, neonatal intensive care
Genetic Diversity of Peanut (Arachis hypogea L.) Cultivars as Revealed by RAPD Markers  [PDF]
Mohannad G. Al-Saghir, Abdel-Salam G. Abdel-Salam
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.614233
Abstract: The objectives of this study were to evaluate the genetic diversity of the peanut accessions using Random Amplified Polymorphic DNA (RAPD) molecular marker and to evaluate RAPD markers to be used in peanut as genetic markers and improve such techniques as suitable strategies for peanut germplasm characterization. Twenty peanut accessions were included in this study and were subjected to RAPD molecular markers analysis. Twenty-seven RAPD primers produced 210 amplification products of which 80 (36.4%) were polymorphic. In conclusion, this study reported a successful fingerprinting of peanut accessions using RAPD markers and demonstrated the usefulness of these markers in estimating the extent of genetic variation in peanut germplasm.
Office Hysteroscopy in Difficult Embryo Transfer; Case Report of Three Cases  [PDF]
Mohamed Elmahdy, Hoda F. Abdel Salam, Nehal A. Kobeisy
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.63021
Abstract: Objectives: To facilitate embryo transfer technique in cases with previous failed or difficult transfer using office hysteroscopy. Study Design: Case report of 3 cases of previous difficult embryo transfer (ET). Methods: Hysteroscopic assisted insertion of cervical stent at the end of withdrawal bleeding in the stimulation cycle. This stent was used as a track for embryo transfer catheter. Results: One case cancelled before (embryo transfer) ET and the other 2 cases didn’t get pregnant in spite of easy embryo transfer. Conclusion: This hysteroscopic assisted ET technique may facilitate ET technique in cases with difficult embryo transfer due to deformed cervix.
Serum Resistin Level and Polymorphonuclear Leukocytes Dysfunctions in Children on Regular Hemodialysis  [PDF]
Maha Yousef Zein, Manal Abdel-Salam, Iman Abdel-Aziz, Naglaa Fathy Mohamed
International Journal of Clinical Medicine (IJCM) , 2015, DOI: 10.4236/ijcm.2015.66055
Abstract:
Resistin is a secretory adipocytoine, which is expressed mainly in humans by inflammatory cells especially macrophages. Resistin serum levels are elevated in end-stage renal diseases of people having an increased risk of infections as a result of impaired polymorphonuclear leukocytes (PMNLs) functions. Objectives: To evaluate neutrophil functions (phagocytosis and oxidative burst) in children with end-stage renal disease (ESRD) on regular hemodialysis and to shed light on the contribution of resistin on neutrophil functions. Patients and Methods: The study included 40 children with ESRD on regular hemodialysis. Their ages ranged from 6 to 12 years, and they were selected from children attending the pediatric hemodialysis unit of AL-Zahraa Hospital, Al-Azher University during the period from October 2012 to December 2013. Another group of 40 apparently healthy children with matched age and sex with the patient group served as a control. Serum resistin, phagocytic index and nitro blue tetrazolium test (NBT%) were assessed in both groups. Results: There was a statistically more significant increase in resistin serum levels in cases than in controls; it was (3.25 ± 0.86 ng/ml) and (0.25 ± 0.16 ng/ml) respectively (P < 0.01). On the other hand there was a statistically more significant decrease in neutrophil phagocytic index in cases than in controls; it was (2.57 ± 1.34) and (3.55 ± 0.74) respectively (P < 0.01). Also it showed a statistically more significant decrease in NBT% in cases than in controls; it was (47.98 ± 16.38%) and (61.45 ± 13.17%) respectively (P < 0.01). We found negative correlation between resistin serum level with phagocytic index and NBT%, while we found positive correlation between resistin serum level and hemodialysis duration. Conclusion: High resistin serum level in children with ESRD decreases phagocyte function and oxidative burst of PMNLs, and this is enhanced by the longer duration of hemodialysis.
Biological and Life Table Studies of Harmonia axyridis Pallas (Coleoptera: Coccinellidae) Reared on the Factitious Prey, Sitotroga cerealella Olivier (Lepidoptera: Gelechiidae)
A. H. Abdel-Salam
Pakistan Journal of Biological Sciences , 2000,
Abstract: The developmental times of immature stages, survival percent, longevity, fecundity, and life table parameters of Harmonia axyridis were studied under laboratory conditions by feeding on fresh and frozen grain moth eggs (GME), Sitotroga cerealella. The effect of crowding adults on fecundity of females was also determined. The total developmental time from egg hatching to adult eclosion ranged from 18.89 0.32 to 22.5 0.21 days on fresh and frozen GME, respectively. Survival percent from egg hatching to adult emergence was differed significantly when the predator fed on the two diets of GME. Also, pupal and adult weights were affected by feeding on fresh and on frozen GME. There were no significant differences in longevity of females, while there were significant variations in fecundity of females and longevity of males. The calculated values of T, DT, Ro, rm, and erm were high by feeding on fresh GME. Morever, rates of survivorship (Lx), and maximum oviposition per female per day (Mx) were high when the predator reared on fresh than on frozen GME. Crowding conditions of predator adults affected the fecundity of females due to egg cannibalism by both males and females of the predator.
Risk Stratification Treatment of Pediatric Rhabdomyosarcoma: South Egypt Cancer Institute Experience  [PDF]
Hamza Abbas, Amany M. Ali, Heba Abdel Razik Sayed, Mohamed A. Salem, Mohammed Hamdy
Journal of Cancer Therapy (JCT) , 2012, DOI: 10.4236/jct.2012.35076
Abstract: Risk stratification allows tailoring of treatment protocol using, for selected patients, reduced total chemotherapy exposure, including decreases in alkylator therapy and avoidance of agents with recognized risk of late complications (anthracyclines), elimination of irradiation and reduction of radiotherapy dose. Patients and Methods: Twenty-nine newly diagnosed pediatric rhabdomyosarcoma patients attended the pediatric oncology department between January 2008 and May 2011. Patients were divided into 3 groups according to age, stage, group, pathology and site of the tumor. Treatment protocol tailored according to risk group. Results: Twenty-nine newly diagnosed pediatric rhabdomyosarcoma patients were evaluated. Seven patients had low risk, Intermediate risk included 12 patients, and 10 patients had high risk. After three years median follow up, event free survival was 51.7% for all patients however it was 86%, 67% and 10% for low, intermediate and high risk respectively (P = 0.0002). There was statistical difference for survival among different sites, histology, clinical group and stage as risk factors within each risk group, no statistically survival significance of any of these factors within the same risk group. Conclusion: Risk stratification is the best single predictor factor for pediatric rhabdomyosarcoma and allows tailoring of the treatment protocol. For selected patients, reductions in total chemotherapy exposure, elimination of irradiation in selected low risk patients and reduction of radiotherapy dose according to postoperative margin and nodal status is safe.
Rapid Identification of Methicillin Resistant Staphylococcus aureus Using Real Time PCR  [PDF]
Said Abbadi, Hamdy Youssef, Dalal Nemenqani, Ahmed S. Abdel-Moneim
Advances in Infectious Diseases (AID) , 2013, DOI: 10.4236/aid.2013.31005
Abstract:

Screening for colonization with methicillin resistant Staphylococcus aureas (MRSA) is a key aspect of infection control to limit the nosocomial spread of this organism. Current methods for the detection of MRSA in clinical microbiology laboratories using conventional methods is time consuming. In this research we are trying to evaluate the use of real time PCR for the detection of MRSA. The PCR assay was evaluated in clinical isolates of MRSA (n = 45) and methicillin susceptible Staphylococcus aureas MSSA (n = 10). The diagnostic values of the assay showed high sensitivity and specificity. This real-time PCR assay proved to be a fast, sensitive and specific tool for MRSA detection in a routine microbiological laboratory. Real-time PCR now is available in all laboratories so its use in identification of MRSA will help in shortening the period for MRSA identification and will help in the success of infection control programs in hospitals.

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