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Search Results: 1 - 10 of 325625 matches for " Mariam S. Alghamdi "
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Effects of Exposure to Electromagnetic Field on of Some Hematological Parameters in Mice  [PDF]
Mariam S. Alghamdi, Nawal A. El-Ghazaly
Open Journal of Medicinal Chemistry (OJMC) , 2012, DOI: 10.4236/ojmc.2012.22005
Abstract: Objective: To investigate the effects of electromagnetic fields on some hematological parameters of Male white mice. Methods: In this study two experiments were used as short-term and long-term experiments. Short-term experiments were carried out in 80 male white Balb/c mice exposed to two types of mobile phone for a period time up to 60 min a day for 2 weeks. Long-term experiments was carried out in 30 male white Balb/c mice exposed to two types of mobile phone for a period time up to 90 min a day for a day for a month, two months, three months. Result: The present result found that a decline in hemoglobin, hematocrit, red blood cells count, in addition to the platelets count after short and long exposure to both types of mobile phone (Alcatel, Nokia,). It was observed that the average number of white cells and lymphocytes increased significantly, indicating the increase to the body’s immune response to radiation. Also, when exposed to both devices (Alcatel, Nokia) for 15 minutes, the red blood cells began to take roles formation due to an increase in the viscosity of the blood and the ability of the cells adhesion. Increased duration of exposure to 30-minute to both devices revealed disparities in the sizes of red blood cells with the appearance of a large proportion of cells with pale colors due to lack of hemoglobin. In the group exposed for 45 minutes showed clearly the influence of mobile phones on examining blood smears which observed a proportion variation in the cell sizes with the emergence of forms of abnormal forms, including pellets cleft with many areas empty of red blood cells, With increasing in of exposure duration to 60 minutes, red blood cells appeared completely different from the natural form and took the forms resembling the eye and tear that appear in the case of anemia. After three months of exposure to both types of mobile phone showed pathological changes in red blood cells where gripped the outer membrane of the red corpuscle changes and become serrated. Conclusion: Exposure to electromagnetic fields is responsible for the variations of some hematological parameters in rats.
The Role of Trait Emotional Intelligence in Individual Performance: A Descriptive Study in Albaha University, Saudi Arabia  [PDF]
Faris S. Alghamdi
Journal of Service Science and Management (JSSM) , 2014, DOI: 10.4236/jssm.2014.75033
Abstract: The current study investigates the relationship between emotional intelligence and individual performance, namely academic performance. It also aims at determining whether emotional intelligence differs between male and female students. The data were obtained through the Schutte Self-Report Emotional Intelligence (SSREI) questionnaire, which was distributed to undergraduate students in Albaha province, Saudi Arabia. A sample of 191 undergraduate students filled in (SSREI), which included the demographic and academic performance measures. The results indicated that the relationship between emotional intelligence and academic performance was not statistically significant. Moreover, no statistically significant difference was found between male and female students in the total of emotional intelligence score.
Another Look at Job and Life Satisfaction among Employees: Evidence from a Developing Country  [PDF]
Faris S. Alghamdi
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.51002
Abstract: Organizational literature has demonstrated remarkable attention to the relationship between job and life satisfaction. Approaching the relationship between job and life satisfaction from an attitu-dinal perspective, the present study was conducted to examine the relationship between job and life satisfaction in Southern Saudi Arabia. It also aimed to investigate the contribution of demo-graphic and socioeconomic variables in predicting job and life satisfaction. The results of Pearson correlation analysis and hierarchical regression analysis revealed a statistically significant rela-tionship between job and life satisfaction, even after controlling for demographic and socioeconomic variables. The results also suggested that job satisfaction and life satisfaction were positively and reciprocally related. Having controlled for demographic and socioeconomic variables, the age variable was uniquely predicted job satisfaction. Additionally, Tukey’s post-hoc test showed that participants whose age ranged from 40 to 50 were more satisfied with their jobs (M = 3.73; SD = 0.35) than those from 18 to 28 and from 29 to 39. That is, older employees were more satisfied with their jobs than younger employees.
Chemical Composition of Faba Bean (Vicia faba L.) Genotypes under Various Water Regimes
Salem S. Alghamdi
Pakistan Journal of Nutrition , 2009,
Abstract: A set of thirteen faba bean genotypes were grown at three water regimes (13200, 7600 and 4800 m3/ha) severe, moderate and normal irrigation during the growing season of the crop, to examine the variability of seed chemical composition. The result showed that faba bean genotypes vary greatly in their chemical composition at various water regimes and proximate analysis showed that faba bean genotypes had low moisture contents that ranged from (7.09 - 7.59%). Carbohydrate contents were fairly high (42.4- 47.3%). The highest protein contents under water stress condition and normal irrigation was recorded for Kamlin (36.8 and 39.1%), while the lowest was observed in Sakh1 (35.2 and 37.5%), respectively. Simultaneously, the crude protein content in the seeds varied from 31.8% to 39.7% and consisted of 18 amino acids. Kamlin had the highest (117g/1000g protein) total essential amino acids while Giza402 had the lowest (82.2 g/1000g protein). Methionine and cysteine were the limiting amino acids in the faba seeds. The Protein fraction varied among these genotypes, globulin was followed by glutelin, prolamin and albumin respectively. Evidence was found that protein content increased during water stress treatment.
Yield Stability of Some Soybean Genotypes Across Diverse Environments
Salem S. Alghamdi
Pakistan Journal of Biological Sciences , 2004,
Abstract: Five soybean genotypes (Giza 35, Crawford, Giza 82, Clark and Giza 111) were evaluated in six sowing dates (Feb. 25, Mar. 25, Apr. 25, May 25, June 25 and July 25) during the two consecutive growing summer seasons of 2000 and 2001 at Agricultural Experimental Research Station in Dirab, Saudi Arabia to explore the genotypes x environment effects and stability in performance of soybean genotypes for seed yield. Genotypes, years, sowing dates and their interaction were highly significant for the studied traits. The significant G x E interaction for seed weight per plant (g) and seed yield (t ha-1) indicated that the tested genotypes ranked differently across diverse environments. The response of seed weight and seed yield varied from genotype to another across different environmental conditions. This may offer raw material for improving soybean performance under the investigated conditions. Giza 111 and Clark had high means performance and had high phenotypic stability and they could be grown over wide range of environments. Results showed that Giza 111 and Clark have the highest mean values, while Giza 82 and Giza 35 had the lowest mean values over all environments and poorly adapted. The results suggested that to maximize seed yield potential, genotypes which have a consistently high yield performance across diverse growing environments should be selected and more than one year of evaluation. Genotype x environment interactions proved to play a significant role in the success of any breeding programs for development of genetic materials adapted to wide range of environments.
Heterosis and Combining Ability in a Diallel Cross of Eight Faba Bean (Vicia faba L.) Genotypes
Salem S. Alghamdi
Asian Journal of Crop Science , 2009,
Abstract: The present investigation was carried out under insect-free cages during the three successive seasons 2004-2006. A diallel cross excluding reciprocals among eight faba bean genotypes was used to estimate the heterotic effects of F1 crosses and F2 populations relative to their respective mid and better parents and combining ability analysis for yield and some of its variables. Highly significant differences among the tested entries were detected for different traits, indicating wide genetic variability for all traits. Heterosis percentages relative to mid-parents were significantly positive in several crosses with a range of 15.6-19.7, 38.0-59.8, 85.0-131.4, 74.3-79.4, 54.4-127.2 and 69.8-142.0% for plant height, number of branches per plant, number of pods per plant, number of pods per main stem, number of seeds per plant and seed yield per plant, respectively. However, heterosis percentages relative to better parent were significantly positive in some crosses and recorded a range of 19.0-19.0, 54.2-73.7, 62.9-97.7 and 47.6-129.9% for plant height, number of pods per plant, number of seeds per plant and seed yield per plant, in the same order. Some crosses exhibited significantly negative heterosis compared to respective mid-parent for days to flowering (from -9.0-23.5%). The ratios of exceeded the unity for number of pods per plant, number of pods per main stem and 100-seed weight indicating that the genetic variation among these traits appeared to be additive. However, low (less than unity), revealed the predominance of non-additive gene action for days to flowering, plant height, number of branches per plant, number of seeds per plant and seed yield per plant. The three parental genotypes: Aquadulce, Luz and Giza 716 were found to be a good combiners for 100-seed weight. Moreover, the parental genotype Geizera 2 was a good combiner for both number of pods and seed yield per plant. Three parents Geizera 2, Giza 402 and Triple white were good combiners for earliness. Five crosses Geizera 2xGiza 716, Geizera 2xSakha 1, Geizera 2xGiza 402, Giza 716xSakha 1 and Giza 716xGiza 402 had significant Specific Combining Ability (SCA) for most studied traits.
Post-surgical complications of symphyseal block graft with and without soft tissue grafting
Ali S. AlGhamdi
Saudi Medical Journal , 2013,
Abstract: Objectives: To determine whether soft tissue augmentation prior to block grafting will minimize post-block grafting soft tissue complications. Methods: This longitudinal controlled pilot study was conducted at the Faculty of Dentistry, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia from October 2010 to January 2013. Fourteen sites requiring block grafting were divided into 2 groups: Group A - 7 sites in 6 patients were subjected to monocortical block graft (control); and Group B - 7 sites in 6 patients were subjected to soft tissue graft through new tunnel technique, followed by monocortical block graft (test). Results: In Group A, 2 patients had wound dehiscence and graft exposure. The first that had an exposure of 3x4 mm resulted in 45% resorption of the graft. The second had an exposure of 4x5 mm followed by infection, which resulted in 75% resorption of the graft. In the other 5 cases, sites healed with no complications and minimal resorption (0-15%). In Group B - there were generalized 1-2 mm increases in the thickness of soft tissue following soft tissue graft. Recipient sites healed with no complications or infection following block grafting. Block graft resorption ranged from 0-15%. Conclusion: More complications were seen in those patients who did not receive soft tissue augmentation, thus demonstrating the importance of soft tissue preparation prior to block grafting, especially in patients having thin soft tissue.
Robust Non-Coherent Demodulation Scheme for Bluetooth Voice Transmission Using Linear, Extended, and Unscented Kalman Filtering  [PDF]
Ali S. Alghamdi, Mahdi N. Ali, Mohamed A. Zohdy
Journal of Signal and Information Processing (JSIP) , 2015, DOI: 10.4236/jsip.2015.61002
Abstract: This paper presents a novel and cost effective method to be used in the optimization of the Gaussian Frequency Shift Keying (GFSK) at the receiver of the Bluetooth communication system. The proposed method enhances the performance of the noncoherent demodulation schemes by improving the Bit Error Rate (BER) and Frame Error Rate (FER) outcomes. Linear, Extended, and Unscented Kalman Filters are utilized in this technique. A simulation model, using Simulink, has been created to simulate the Bluetooth voice transmission system with the integrated filters. Results have shown improvements in the BER and FER, and that the Unscented Kalman Filters (UKF) have shown superior performance in comparison to the linear Kalman Filter (KF) and the Extended Kalman Filter (EKF). To the best of our knowledge, this research is the first to propose the usage of the UKF in the optimization of the Bluetooth System receivers in the presence of additive white Gaussian noise (AWGN), as well as interferences.
A Configurable Routing Protocol for Improving Lifetime and Coverage Area in Wireless Sensor Networks  [PDF]
Abdullah Alshahrani, Nader M. Namazi, Majed Abdouli, Ahmed S. Alghamdi
Wireless Sensor Network (WSN) , 2017, DOI: 10.4236/wsn.2017.99018
The particularities of Wireless Sensor Networks require specially designed protocols. Nodes in these networks often possess limited access to energy (usually supplied by batteries), which imposes energy constraints. Additionally, WSNs are commonly deployed in monitoring applications, which may intend to cover large areas. Several techniques have been proposed to improve energy-balance, coverage area or both at the same time. In this paper, an alternative solution is presented. It consists of three main components: Fuzzy C-Means for network clustering, a cluster head rotation mechanism and a sleep scheduling algorithm based on a modified version of Particle Swarm Optimization. Results show that this solution is able to provide a configurable routing protocol that offers reduced energy consumption, while keeping highcoverage area.
Video Assisted Thoracoscopic Surgery Ipisilateral Tran-Mediastianal Approach (Using Alzandi Technique) to Contralateral Lung in Patients with Bilateral Lung Lesions  [PDF]
Hassan Alghamdi
Open Journal of Thoracic Surgery (OJTS) , 2013, DOI: 10.4236/ojts.2013.33017
Abstract: Synchronous lung cancer is considered one of the most difficult resection presentations. Bilateral staged thoractomy still exists as the gold standard, as few cases are reported by using median strenotmy. Video-assisted thoracic surgery (VATS) has gained an important role in routine thoracic surgical practice, and staged VATS resection of bilateral lung cancer has been reported with satisfactory results. From here, we describe a patient with bilateral lung cancer in which we successfully resected the contra lateral lung nodule through the ipsilateral VATS approach. To our knowledge, this is the first report of bilateral lung cancer managed with the ipsilateral trans-mediastinal VATS technique (alzandi technique).
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