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Search Results: 1 - 10 of 597759 matches for " Mohammed M. J. Alqahtani "
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Understanding the Sociocultural Health Belief Model Influencing Health Behaviors among Saudi Stroke Survivors  [PDF]
Mohammed M. J. Alqahtani
Neuroscience & Medicine (NM) , 2015, DOI: 10.4236/nm.2015.64023
Abstract: Understanding patients’ beliefs of stroke, especially that cultural model which influences the medical management, is important. Professionals normally hold medical knowledge only about stroke, rather than the patients’ perceptions, which leads to limitations in cultural competency. Little is known about Saudi stroke survivors’ beliefs and behaviors related to their strokes. Methods: A qualitative methodology was used to collect in-depth information from stroke survivors. From March 2010 to October 2014, 45 stroke survivors were recruited from outpatient rehabilitation clinic at King Fahad Medical City (KFMC-RH), during their follow-up treatments. Results: Thematic content analysis yielded four major themes of the causes of stroke: medical, cultural, psychological and environmental. Three major themes were determined regarding stroke interventions: medical, lifestyle and behavioral, as well as cultural interventions. Stroke is most likely to be associated with a wide range of cultural beliefs by stroke survivors, leading them to cultural behaviors and management. All of these cultural interventions were typically used as an adjunct rather than an alternative to medical care. Conclusions: Health professionals need to be aware that cultural beliefs and their management are common problems for stroke survivors undergoing rehabilitation in a hospital. This study could be one step forward to help health professionals become culturally competent when working with stroke survivors in a rehabilitation setting in Saudi Arabia.
Awareness and Behaviour Related to Orthodontic Treatment among School Children in Aseer Region, Kingdom of Saudi Arabia  [PDF]
M. Zakirulla, Hussain Almubarak, Sahar N. Fageeh, Abeer A. Alghothimi, Saleh Khalid Alqahtani, Faris Mohammed Alqahtani, Fahad Thamer Alshahrani
Open Journal of Stomatology (OJST) , 2019, DOI: 10.4236/ojst.2019.94009
Abstract: Background: Awareness of malocclusion and the need to make corrections have increasingly become prevalent among the young population. In the period of adolescence, physical appearance is crucial in the construction of personal identity, including one’s relationship with one’s own body. Orthodontic treatment includes improved oral health and enhanced psychological wellbeing. Early orthodontic treatment for children will be crucial to improving oral health. The present study aims to assess the awareness towards orthodontic treatment among school children’s of Aseer region, Saudi Arabia. Materials and Methods: A total of 835 (450 boys and 385 girls) school children’s, of age group between 10 - 15 years were included in the study. A total of 16 schools in the all Aseer region were surveyed during January to May 2018. A pre-structured self-administered questionnaire consisting of 12 questions with multiple answers were given to the children after the clinical examination to assess their knowledge and attitude towards Orthodontic treatment. Statistical Analysis: The survey data was collected and organized into Microsoft Excel spreadsheets (Microsoft Inc., USA), and was statistically analyzed utilizing the Statistical Package for the Social Sciences version 20.0 software (IBM Inc., USA). The statistical test used here was the chi-square test and P values less than 0.05 were considered to be statistically significant (P < 0.05). Result: A total of 292 (65%) of males and 285 (74%) of females have heard of an orthodontist. 234 (52%) of males said that orthodontist would align their teeth. 203 (45%) and 250 (65%) of males and females respectively are aware that few teeth needed to be removed for aligning irregular teeth. Majority of the children are aware of taking braces treatment at an earlier age would improve facial appearance. 320 (83%) and 227 (59%) of female children aware of that irregular teeth can affect chewing ability and speech respectively. 261 (58%) of males knew that orthodontic treatment is longer than other dental procedures. Conclusion: Findings confirmed that there is a positive awareness towards orthodontic treatment among school children’s, but specific misconceptions and barrier exist. There is no statistical difference between males and females in knowledge and behaviour related to orthodontic treatment and malocclusion in school going, children.
The Impact of Age and Gender on Severity and Types of Periodontal Diseases among Patients from Two Regions in Saudi Arabi  [PDF]
Mohammed M. A. Abdullah Al-Abdaly, Hussain Saad Hussain AlQahtani, Sultan Saeed Hadi Al-Qahtani
Open Journal of Stomatology (OJST) , 2019, DOI: 10.4236/ojst.2019.93005
Abstract: Background: Periodontitis is the predominant disease in the oral cavity and there are alterations in the periodontal tissues associated with the aging and gender of the patient. Objective: The present study was designed to assess the impact of age and gender of the patient on severity and types of periodontal diseases among patients from two regions in Saudi Arabia. Materials and Methods: The current study was done on 600 Saudi patients from Aseer and Tabuk regions in Saudi Arabia (50% males and 50% females) and divided into three equal groups (n = 200) according to the patients age: children and young patients (1 - 24 years old), adults patients (25 - 64 years old) and seniors patients (more than 65 years old). Plaque index (PLI), gingival index (GI), periodontal pocket depth (PPD) and clinical attachment loss (CAL) were recorded from all participants. The data were collected and analyzed with SPSS to determine the mean and standard deviation (±SD) and the values of significance (P ≤ 0.005). Results: The results of the present study revealed that 340 patients (56.7%) were affected with gingivitis dental biofilm induced and 260 patients were affected by periodontitis. Gingivitis dental biofilm-induced is especially detected in children and young patients (33.3%), adult patients (16.7%) and seniors patients (6.7%) whereas periodontitis cases were seen among the adult and seniors patients (16.7%) and (26.6%) respectively. Furthermore, the present study displayed the higher severity and prevalence of gingivitis dental biofilm-induced and periodontitis among females more than males in group II and group III maybe due to hormonal changes. The present study saw that there are statistically significant differences in clinical findings in the comparison between groups of this study (P ≤ 0.005). Conclusion: We conclude that there is a relation between severity and types of periodontal diseases and the ages and genders of Saudi patients in Aseer and Tabuk regions, Saudi Arabia.
Ricci magnetic geodesic motion of vortices and lumps
L. S. Alqahtani,J. M. Speight
Physics , 2014, DOI: 10.1016/j.geomphys.2015.07.008
Abstract: Ricci magnetic geodesic (RMG) motion in a k\"ahler manifold is the analogue of geodesic motion in the presence of a magnetic field proportional to the ricci form. It has been conjectured to model low-energy dynamics of vortex solitons in the presence of a Chern-Simons term, the k\"ahler manifold in question being the $n$-vortex moduli space. This paper presents a detailed study of RMG motion in soliton moduli spaces, focusing on the cases of hyperbolic vortices and spherical $\mathbb{C}P^1$ lumps. It is shown that RMG flow localizes on fixed point sets of groups of holomorphic isometries, but that the flow on such submanifolds does not, in general, coincide with their intrinsic RMG flow. For planar vortices, it is shown that RMG flow differs from an earlier reduced dynamics proposed by Kim and Lee, and that the latter flow is ill-defined on the vortex coincidence set. An explicit formula for the metric on the whole moduli space of hyperbolic two-vortices is computed (extending an old result of Strachan's), and RMG motion of centred two-vortices is studied in detail. Turning to lumps, the moduli space of static $n$-lumps is $Rat_n$, the space of degree $n$ rational maps, which is known to be k\"ahler and geodesically incomplete. It is proved that $Rat_1$ is, somewhat surprisingly, RMG complete (meaning that that the initial value problem for RMG motion has a global solution for all initial data). It is also proved that the submanifold of rotationally equivariant $n$-lumps, $Rat_n^{eq}$, a topologically cylindrical surface of revolution, is intrinsically RMG incomplete for $n=2$ and all $n\geq 5$, but that the extrinsic RMG flow on $Rat_2^{eq}$ (defined by the inclusion $Rat_2^{eq}\hookrightarrow Rat_2$) is complete.
Sunitinib Reduces Acute Myeloid Leukemia Clonogenic Cells in Vitro and Has Potent Inhibitory Effect on Sorted AML ALDH+ Cells  [PDF]
Asad M. Ilyas, Youssri Ahmed, Mamdooh Gari, Mohammed H. Alqahtani, Taha A. Kumosani, Abdulrahman L. Al-Malki, Khalid O. Abualnaja, Saad H. S. Albohairi, Adeel G. A. Chaudhary, Farid Ahmed
Open Journal of Blood Diseases (OJBD) , 2016, DOI: 10.4236/ojbd.2016.61003
Abstract: Sunitinib is an orally administered, multi-target tyrosine kinase inhibitor that has been approved by the FDA for the treatment of renal cell carcinoma and imatinib resistant gastro-intestinal tumors. Anti-leukemic activity of sunitinib has been examined in early clinical trials with limited success. However, recent trials on acute myeloid leukemia (AML) patients carrying FLT3 mutations have shown promising results. Effects of sunitinib on leukemic clonogenic cells and potential leukemic stem cells have not been examined so far. We analyzed the anti-proliferative and apoptotic properties of sunitinib on AML-derived cell lines. We also tested the effect of sunitinib on AML patient derived clonogenic cells (AML-CFC), as well as flow-sorted potential leukemic progenitors. Peripheral blood or bone marrow samples were obtained from newly diagnosed AML patients and flow sorted for CD34+ CD133+ or ALDH+ cells. Umbilical cord blood derived CD34+ cells were used as normal controls. Sunitinib induced growth arrest and apoptosis in AML derived cell lines. In addition, 7 μM sunitinib induced 75% reduction of AML-CFC as compared to DMSO treated control (±6.79%; n = 4). In contrast, 7 μM sunitinib treatment of umbilical cord blood derived normal CD34+ cells showed 29% reduction in AML-CFC (±6.77%; n = 5). Treatment of ALDH+ cells sorted from 2 AML cases and CD34+ CD133+ cells from one patient showed reduction of AML-CFC on treatment with sunitinib. Our study highlighted a potent anti-proliferative and proapoptotic effect of sunitinib on AML cell lines, AML patient derived clonogenic cells and potential leukemic stem cells.
Adaptive Terminal-Modality-Based Joint Call Admission Control for Heterogeneous Cellular Networks  [PDF]
Mahmoud M. Badawy, Salman A. AlQahtani
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2013, DOI: 10.4236/ijcns.2013.69043

The coexistence of different Radio Access Technologies (RATs) requires a need for Common Radio Resource Management (CRRM) to support the provision of Quality of Service (QoS) and the efficient utilization of radio resources. The provision of QoS is an important and challenging issue in the design of integrated services packet networks. Call admission control (CAC) is an integral part of the problem. Clearly, without CAC, providing QoS guarantees will be impossible. There is unfairness in allocation of radio resources among heterogeneous mobile terminals in heterogeneous wireless networks. In this paper, an Adaptive-Terminal Modality-Based Joint Call Admission Control (ATJCAC) algorithm is proposed to enhance connection-level QoS and reduce call blocking/dropping probability. The proposed ATJCAC algorithm makes call admission decisions based on mobile terminal modality (capability), network load, adaptive the bandwidth of ongoing call and radio access technology (RAT) terminal support index. Simulation results show that the proposed ATJCAC scheme reduces call blocking/dropping probability.

Spectrophotometric Study for the Reaction of Pentoxifylline Hydrochloride with 1,2-Naphthoquinone-4-Sulphonate: Kinetics, Mechanism and Application for Development of High-Throughput Kinetic Microwell Assay for Pentoxifylline in Quality Control Laboratory  [PDF]
Ashraf M. Mahmoud, Saad A. AlQahtani
American Journal of Analytical Chemistry (AJAC) , 2016, DOI: 10.4236/ajac.2016.72015
Abstract: Spectrophotometric study was carried out, for the first time, to investigate the reaction between the vasodilator pentoxifylline hydrochloride (POX) and 1,2-naphthoquinone-4-sulphonate (NQS) reagent. The reaction occurs in alkaline medium to activate the nucleophilic substitution reaction producing an orange-colored product measured spectrophometrically at λmax 472 nm. The variables affecting the reaction were carefully studied and the conditions were optimized. The kinetics of the reaction was investigated and its activation energy was found to be 0.262 cal/mol. Owing to its low activation energy, the reaction proceeded easily and was successfully used for simple and rapid assay of POX. The stoichiometry of the reaction was determined (1:1), and the reaction mechanism was suggested. To develop a high-throughput methodology used in quality control laboratory, a comparative study of the reaction using the conventional spectrophotometric versus microwell assay was applied. Under the optimum reaction conditions, the initial rate and fixed time methods were utilized for constructing the calibration graphs for determination of POX concentrations. The linear range was 10 - 120 μg/ml with good correlation coefficients (0.9987 - 0.9998). The LOD was 2.5 and 3.4 μg/ml for initial rate and fixed time methods, respectively. The intra- and inter-day accuracy and precision of the developed methods were satisfactory, where RSD was ≤3.94%. The present methods have been successfully applied to the determination of POX in its pharmaceutical tablets, and the percentage recovery values were 97.9% - 101.9%. Therefore, we strongly recommend the proposed methods for determination of POX in quality control laboratories.
Distribution System Reliability Analysis for Smart Grid Applications  [PDF]
Tawfiq M. Aljohani, Mohammed J. Beshir
Smart Grid and Renewable Energy (SGRE) , 2017, DOI: 10.4236/sgre.2017.87016
Abstract: Reliability of power systems is a key aspect in modern power system planning, design, and operation. The ascendance of the smart grid concept has provided high hopes of developing an intelligent network that is capable of being a self-healing grid, offering the ability to overcome the interruption problems that face the utility and cost it tens of millions in repair and loss. In this work, we will examine the effect of the smart grid applications in improving the reliability of the power distribution networks. The test system used in this paper is the IEEE 34 node test feeder, released in 2003 by the Distribution System Analysis Subcommittee of the IEEE Power Engineering Society. The objective is to analyze the feeder for the optimal placement of the automatic switching devices and quantify their proper installation based on the performance of the distribution system. The measures will be the changes in the reliability system indices including SAIDI, SAIFI, and EUE. In addition, the goal is to design and simulate the effect of the installation of the Distributed Generators (DGs) on the utility’s distribution system and measure the potential improvement of its reliability.
Matlab Code to Assess the Reliability of the Smart Power Distribution System Using Monte Carlo Simulation  [PDF]
Tawfiq M. Aljohani, Mohammed J. Beshir
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.58003
Abstract: Reliability of power systems is a key aspect in modern power system planning, design, and operation. The ascendance of the smart grid concept has provided high hopes of developing an intelligent network that is capable of being a self-healing grid, offering the ability to overcome the interruption problems that face the utility and cost it tens of millions in repair and loss. In this work, we develop a MATLAB code to examine the effect of the smart grid applications in improving the reliability of the power distribution networks via Monte Carlo Simulation approach. The system used in this paper is the IEEE 34 test feeder. The objective is to measure the installations of the Automatic Reclosers (ARs) as well as the Distributed Generators (DGs) on the reliability indices, SAIDI, SAIFI, CAIDI and EUE, and make comparisons with results from a previous study done by the authors using another approach. The MATLAB code should provide close results to the output of the previous research to verify its effectiveness.
Study the Biochemical Correlation of Insulin Resistance with HbA1c and Sex Hormones in NIDDM Patients/Meisan-Iraq  [PDF]
Adnan J. M. Al-Fartosy, Ibrahim M. Mohammed
Journal of Diabetes Mellitus (JDM) , 2017, DOI: 10.4236/jdm.2017.74025
Abstract: Objective: The association between type 2 diabetes mellitus and certain endocrine disorders has the paucity of information and limited data in the province of Meisan (southern of Iraq). Hence, in the present study, an attempt was made to investigate the levels of plasma HbA1c, serum insulin resistance and levels of serum sex hormones in men and women of control and type 2 diabetic patients. Also, the present study aimed to explored the correlation coefficient (r) between insulin resistance and level of HbA1c, FSH, LH, Tt, progesterone and estradiol in men and women patients with NIDDM. Methods: One hundred Iraqi volunteers with abdominal obesity were selected in the present study. Fifty diabetic patients with NIDDM (26 men, and 24 women) aged between (37) and (65) years and 50 healthy individuals (25 men, and 25 women) aged between (36) and (65) years considered as control group. Complete medical history was taken from each subject and complete clinical examinations were performed for all volunteers. Then, the two groups were matched for their fasting blood sugar, BMI, insulin hormone; c-peptide, HbA1c, sex hormones and insulin resistance parameters (HOMA2-IR, HOMA%B and HOMA%S) were calculated using HOMA2 calculator software. Results: We found that insulin resistance demonstrated negative correlations (p < 0.05) with levels of serum follicle stimulating hormone (FSH), luteinizing hormone (LH), total testosterone, progesterone and estradiol. While, there was a positive and significant correlation (p < 0.01) with value of HbA1c in men and women NIDDM patients. Conclusion: We conclude that an increase in the level of insulin resistance is associated with increased level of blood HbA1c and decreased in level of serum sex hormones (FSH, LH, Tt, E2 and progesterone) in men and women of diabetic group. These behaviors might suggest that insulin resistance can be used as a
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