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Search Results: 1 - 10 of 1700 matches for " Saad Hafidh "
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Valvular and perivalvular involvement in patients with chronic kidney disease
Neelavathi Senkottaiyan,Saad Hafidh,Farrin A Manian,Martin A Alpert,
Neelavathi Senkottaiyan
,Saad Hafidh,Farrin A. Manian,Martin A. Alpert

老年心脏病学杂志(英文版) , 2005,
Abstract: Mitral annular calcification (MAC) and aortic valve calcification (AVC) are the most common valvular and perivalvular abnormalities in patients with chronic kidney disease (CKD). Both MAC and AVC occur at a younger age in CKD patients than in the general population. AVC progresses to aortic stenosis and mild aortic stenosis progresses to severe aortic stenosis at a more rapid rate in patients with CKD than in the general population. The use of calcium-free phosphate binders in such patients may reduce the calcium burden in valvular and perivalvular structures and retard the rate of progression of aortic stenosis. Despite high rates of morbidity and mortality, the prognosis associated with valve surgery in patients with CKD is better than without valve surgery. Infective endocarditis remains an important complication of CKD, particularly in those treated with hemodialysis.
Assessing the Usability of Institutions Web Pages  [PDF]
Saad Subair
International Journal of Internet and Distributed Systems (IJIDS) , 2014, DOI: 10.4236/ijids.2014.23003
Abstract: The usability of the web pages is assessed using some statistical models. Researchers argue that many usability results and recommendations lack empirical and experimental data. Universities web pages are chosen as subjects for this work. Series of experiments have been conducted to investigate into the usability and design of the universities web pages. Prototype web pages have been developed according to the structured methodologies of web pages design and development. Four universities web pages were evaluated together with the prototype web pages using a questionnaire which was designed according to the Human Computer Interactions (HCI) concepts. The data collected was analyzed using correlation and regression models. The correlation analysis showed that there were significant positive and negative correlations between many items. The regression analysis revealed that the most significant factors (items) that contributed to the best model of the universities web pages design and usability were: multimedia in the web pages, the web pages icons (alone) organization and design, and graphics attractiveness. The results showed some of the limitations of some heuristics used in conventional interface system design and proposed some additional heuristics in web pages design and usability.
Saltwater Intrusion in Jizan Coastal Zone, Southwest Saudi Arabia, Inferred from Geoelectric Resistivity Survey  [PDF]
Saad Mogren
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.63022
Abstract: This work focuses on the causes of water quality deterioration in the coastal plain of Jizan area, southwest Saudi Arabia using vertical electrical sounding (VES) surveys. Schlumberger electrode array is used in the study with the current electrode spacing ranging from 400 to 600 m to delineate the thickness of the shallow aquifer and its possible interaction with the sea water. The differences in resistivity are associated with the variations in lithology and groundwater saturation and salinity. The interpretation of VES curves reveals low resistivity zones characterizing the study area. These zones reflect saline water intrusion in the coastal aquifer. Generally, it is observed that the resistivity of saturated zone decreases towards the sea, indicating the influence of seawater. Based on the interpretation of the constructed resistivity pseudo-sections and 1-D sequential inversion models, three factors are identified to control the seawater intrusion into the shallow groundwater aquifers: 1) presence of faults that contribute extensively in the seawater intrusion as the seawater invades the coastal aquifers through the crushed rocks in fault zones related to the Red Sea rifting, 2) over-withdrawal of groundwater from the coastal aquifers, resulting in saline water intrusion from the sea into the freshwater aquifer, and 3) the lithological variation where the alluvial sediments of the ancient buried wadi (dry valley) channels provide potential pathways for saltwater intrusion and make a hydraulic connection between the aquifer and the sea water.
Analysis of the Performance Indicators of the PV Power System  [PDF]
Saad Odeh
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.66005
Abstract: The energy assessment of the PV power systems is carried out by using different types of performance indicators that benchmark the output of these systems against the PV panel maximum output at hypothetical operation conditions. In this paper, a comparative analysis of six types of performance indicators is conducted and a new performance indicator which considers PV panel slope and orientation is proposed. The proposed indicator is benchmarking the PV system actual output against the maximum output of the same system if it would operate in two axis tracking mode. The proposed performance indicator is used to develop a friendly user calculator of PV system output that can be used by, energy providers and PV system installers to evaluate the output of the PV grid connect network. The advantage of the developed calculator is high-lighted by a case study that estimates energy capacity of different residential rooftop PV systems installed in a residential suburb in Sydney.
Changing survival, memory cell compartment, and T-helper balance of lymphocytes between severe and mild asthma
AS Abdulamir, RR Hafidh, F Abubakar, KA Abbas
BMC Immunology , 2008, DOI: 10.1186/1471-2172-9-73
Abstract: Four research lines were investigated and compared among mild asthmatics, severe asthmatics, and healthy groups by applying immunocytochemical staining of PBL. Antiapoptotic and proapoptotic proteins with Bcl-2/Bax ratio, CD4, CD8 markers with CD4+/CD8+ ratio, CD45RO+, CD45RA+ markers with memory/na?ve ratio (CD45RO+/CD45RA+). Th2/Th1 cytokines balance represented by IL-4/IFN-γ ratio was measured by enzyme-linked immunosorbent assay (ELISA) for in vitro PBL cytokine synthesis. It was found that Bcl-2/Bax ratio was higher in severe than in mild asthmatics which in turn was higher than in healthy group. And memory/na?ve ratio of PBL was higher in severe than in mild asthmatics. Moreover, memory cells, CD45RO+ and CD45RO+/CD45RA+ ratio were correlated directly with Bcl-2/Bax, in severe and mild asthma patients. In contrast, CD4+/CD8+ ratio was not changed significantly among healthy group, mild and severe asthmatics. However, CD8+ cells were correlated directly with memory cells, CD45RO+, in severe asthmatics only. Interestingly, the dominant profile of cytokines appeared to change from T helper 2 (Th2) in mild asthmatics to T helper 1 (Th1) in severe asthmatics where the lowest in vitro IL-4/IFN-γ ratio and highest IFN-γ were found.It was concluded that the underlying mechanisms of inflammation might vary greatly with asthma stage of severity. Mild intermittent asthma is mainly Th2 allergen-oriented reaction during exacerbations with good level of apoptosis making the inflammation as self-limiting, while in severe persistent asthma, the inflammatory reaction mediated mainly by Th1 cytokines with progressive loss of apoptosis leading to longer exacerbations, largely expanded memory cells, CD45RO+, leading to persistent baseline inflammation.Inflammation is the central feature of asthma pathogenesis and the core of its clinical manifestations that plays the main role in airway obstruction and hyperresponsiveness [1]. Asthma is a waxing and waning disease that leads to s
Phenotype microarray profiling of the antibacterial activity of red cabbage
Hafidh RR,Abdulamir AS,Abu Bakar F
Functional Foods in Health and Disease , 2012,
Abstract: Background: Functional food can be a potent source of wide array of biocomonents with antimicrobial activity. We investigated the antibacterial activity of red cabbage (RC) extract on Gram negative and positive ATCC strains. Most intersting, we, for the first time, explored and analysed the complete phenotypic profile of RC-treated bacteria using Omnilog Phenotype Microarray. Results: This study revealed that the phenotype microarray (PM) screen was a valuable tool in the search for compounds and their antibacterial mechanisms that can inhibit bacterial growth by affecting certain metabolic pathways. It was shown that RC exerted remarkable antibacterial effect on S. aureus and E. coli bacteria, and PM showed a wide range phenotypic profile of the exerted RC antibacterial activity. RC targeted the peptide, carbon, nutriontional assembly, and sulfur metbolic pathways altogether. The peptidoglycan synthesis pathway was inferred to be targeted by RC extract at a metabolic point different from other available cell wall-targeting drugs; these could be hot targets for the discovery of new therapy for many problematic microbes.Conclusions: Taken together, the phenotype microarray for functional food and medicinal plants can be a very useful tool for profiling their antimicrobial activity. Moreover, extracts of functional food can exert antibacterial activity by hitting a wide range of metabolic pathways, at the same time leading to very difficult condition for bacteria to rapidly develop resistance. Therefore, using functional foods or medicinal plants as such, or as extracts, can be superior on mono-targeting antibiotics if the optimal concentrations and conditions of these functional foods were sought.
Prevalence and Pathology of Trichomoniasis in Free AND#8211; Living Urban Pigeons in the City of Mosul, Iraq
Hafidh I. Al- Sadi and Aws Z. Hamodi
Veterinary World , 2011,
Abstract: The present study was undertaken to determine the prevalence of trichomoniasis and its pathology in pigeons. A total of 100 free living urban pigeons were collected during the months August and September 2007. The overall prevalence was 16%. In infected pigeons, yellowish – white masses of caseous necrotic material were seen grossly in the oral cavity, esophagus, crop, and proventiculus. Pale to yellow necrotic areas were noted in the liver. Multiple foci of caseous necrosis were seen microscopically in the oral mucosa together with heavy infiltration of inflammatory cells (mainly heterophils). Foci of necrotic inflammation were seen in the liver and there was thickening of the lining mucosa of the esophagus due to extensive infiltration of heterophils. Collections of necrotic material were seen in the mucosa and submucosa of the esophagus. Infection occurred more frequently in young than in adult pigeons. A higher prevalence of the infection was noted in male than in female pigeons. In all of the infected pigeons, trichomoniasis occured in the absence of apparent secondary disease. It was concluded that trichomonad infection is fairly common in free living urban pigeons in the city of Mosul, Iraq. [Veterinary World 2011; 4(1.000): 12-14]
The Relationship between Program Evaluation Experiences and Stakeholder Career Satisfaction  [PDF]
Saad F. Shawer, Saad A. Alkahtani
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.38196
Abstract: This paper examines the relationship between program evaluation experiences and stakeholder career satisfaction. The study employs mixed paradigms, descriptive and correlational research, qualitative evaluation, interviews, rating-scales and the parametric Pearson product-moment coefficient of correlation. Data analysis reveals differences between the descriptive and correlational findings. The descriptive findings show low faculty and program director career satisfaction at the beginning of program evaluation while concluding program evaluation experiences show a dramatically high career satisfaction. Correlational results, however, indicate not only a relatively low but also negative correlation between initial and final program evaluation experiences in career satisfaction. The study concludes a relationship exists between initial and final program evaluation experiences in stakeholder career satisfaction. The more program evaluation experiences stakeholders have, the less career dissatisfaction signs they show. Supportive program evaluation contexts lower program stakeholder negativity and encourage effective implementation and use of program evaluation.
Modeling Transfer Function of Electrical Power Lines for Broadband Power Line Communication  [PDF]
Saad D. Bennani
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2012, DOI: 10.4236/ijcns.2012.51005
Abstract: The indoor access network is characterized by several branches that cause many reflections. In this paper, we present an approach to model the transfer function of electrical power lines for broadband power line communication. The assuming channel consists of three wires, which is widely used in many countries. As an application of the proposed method, the effect of line length from transmitter to receiver, branched line length and number of branched are also studied. From the frequency response of the transfer function (magnitude and phase), it is seen that the position of notches and peaks in the magnitude responses are largely affected in terms of attenuation by the electrical network which consists of 15 branches.
Total Organic Carbon Enrichment and Source Rock Evaluation of the Lower Miocene Rocks Based on Well Logs: October Oil Field, Gulf of Suez-Egypt  [PDF]
Aref Lashin, Saad Mogren
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.34069
Abstract: October oil field is one of the largest hydrocarbon-bearing fields which produces oil from the sand section of the Lower Miocene Asl Formation. Two marl (Asl Marl) and shale (Hawara Formation) sections of possible source enrichment are detected above and below this oil sand section, respectively. This study aims to identify the content of the total organic carbon based on the density log and a combination technique of the resistivity and porosity logs (Δlog R Technique). The available geochemical analyses are used to calibrate the constants of the TOC and the level of maturity (LOM) used in the (Δlog R Technique). The geochemical-based LOM is found as 9.0 and the calibrated constants of the Asl Marl and Hawara Formation are found as 11.68, 3.88 and 8.77, 2.80, respectively. Fair to good TOC% content values (0.88 to 1.85) were recorded for Asl Marl section in the majority of the studied wells, while less than 0.5% is recorded for the Hawara Formation. The lateral distribution maps show that most of the TOC% enrichments are concentrated at central and eastern parts of the study area, providing a good source for the hydrocarbons encountered in the underlying Asl Sand section.
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