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Search Results: 1 - 10 of 465699 matches for " A. Mohammed "
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In Vitro Chromosomal Aberration Frequency by Electrofishing on Poecilia latipinna (Sailfin Molly) Fishes in Southern of Iraq  [PDF]
Mohammed A. Abd Ali, Mohammed H. Mohammed, Marwa K. Sadeq
American Journal of Molecular Biology (AJMB) , 2018, DOI: 10.4236/ajmb.2018.82010
Abstract: The present studies describe Chromosomal aberration effects of electrofishing, which were evaluated on Poecilia latipinna, located in Shat Al-Arab river in Al-garmma city (south of Iraq). The electrofishing derive used in work is simulated to that used in the commercial fishing. The apparatus generates voltage ranged from 40 to 280 volts. Nine bearers of Poecilia latipinna sailfin molly fish in chromosomal analysis were divided into three treatments. The first were a control, the fishes of the second were exposed to 110 volts (10 seconds), and final groups were exposed to 110 volts (15 seconds). Mitotic index of the electrofishing with a control for each group decreased with increasing exposed time in somatic cell kidney tissue of Poecilia latipinna. The chromosome
Anti-CD-20 Therapy in Refractory Adult Still’s Disease  [PDF]
Reem Hamdy A. Mohammed
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2012, DOI: 10.4236/ojra.2012.22002
Abstract: Adult Still’s disease is a relatively rare form of rheumatoid arthritis with systemic inflammatory features. The prevalence is around 1.5 cases per 100,000 - 1000,000. In the current case we display a 30-year-old male patient with refractory adult still’s disease who suffered recurrent attacks of fever 39.5°C, arthritis in proximal interphalangeal joints (PIPs), wrists, tempromandibular joints (TMJs), knees and ankles, stitching chest pain, dyspnea, erythematous rash over the trunk, sore throat, weight loss (15 Kilograms in 4 months). The patients’ disease remained uncontrolled despite of synthetic disease modifying anti-rheumatic drugs and repeated intramuscular corticosteroid injections. Laboratory workup revealed erythrocyte sedimentation rate (ESR) of 95, C-reactive protein (CRP) of 100 mg/L, hemoglobin 10.5 gm%, leukocytosis 12,000/microlitre, mild elevation of liver function tests and dyslipidemia. Serology revealed negative rheumatoid factor, anti-nuclear antibody titre of 1:80, elevated serum ferritin 4000 micrograms/litre. The patient was started on rituximab (375 mg/m2), prednisolone 20 mg/day and selective Cox-2 inhibitor. Follow up for over three months following the completion of his pulse therapy, revealed no relapse of fever or fatigue, with morning stiffness of 5 - 10 minutes, VAS of 3, DAS28 of 3.8, HAQDI of 0.62, ESR 23, CRP 4.9, Hb 12.5 gm%, leucocytic count 9000/microlitre, the dose of prednisolone was successfully reduced to a dose of 5 mg/day orally. Conclusion: Anti-CD20 therapy successfully controlled systemic and articular refractory disease with sustained efficacy over a follow up period of up to 24 weeks.
Time-Optimal Control Problem for n× n Co-Operative Parabolic Systems with Control in Initial Conditions  [PDF]
Mohammed A. Shehata
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.39A1006

In this paper, time-optimal control problem for a liner n× n co-operative parabolic system involving Laplace operator is considered. This problem is, steering an initial state y(0)=u , with control u so that an observation y(t) hitting a given target set in minimum time. First, the existence and uniqueness of solutions of such system under conditions on the coefficients are proved. Afterwards necessary and sufficient conditions of optimality are obtained. Finally a scaler case is given.

First Review of Articles on Rhotrix Theory Since Its Inception  [PDF]
A. Mohammed, M. Balarabe
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2014, DOI: 10.4236/alamt.2014.44020

This paper presents an up-to-date review of the developments made in the field of rhotrix theory for a decade, starting from the year 2003, when the concept of rhotrix was introduced, up to the end of 2013. Over forty articles on rhotrix theory have been published in journals since its inception, indicating the need for a first review.

Partial Quality Assessment of 60Co-Teletherapy Machine Performance  [PDF]
Mohammed A. Ali Omer
Open Journal of Radiology (OJRad) , 2015, DOI: 10.4236/ojrad.2015.54032
Abstract: The aim of this study was to assess the performance of 60Co-teletherapy unit at Radiation and Isotopes Center in Khartoum, using the common tools used for quality control (Front pointer, Graphic paper, Pin, Non-screen film, meter and Check plate). The collected and analyzed data revealed that: there was a difference between the calculated theoretical field size (FS) and the measured one relative to the change of SSD; and the average FS shift was 0.9 cm relative to the standard one, while the machine isocenter was almost fixed at 0° with a shift of 0.003 cm, which was within the standard limit (0.2 cm). The diaphragm isocenter showed a shift of ±0.36 cm (i.e. in clock and anti clock wise) in average relative to standard limit (±0.3 cm) and the couch vertical isocenter (CVI) relative to the SSD changes was exceeded the standard limit (0.2 cm) by a factor of 0.9 cm. Also the SSD determined by the optical distance indicator was greater than the actual SSD (determined by Front pointer and measured by scale meter) by an average of 0.8 cm; which exceeded the limit (0.3 cm) by an average factor of 0.5 cm. The study also showed that the penumbra profile (1.5 cm) was less than the actual specified for 60Co-teletherapy machine, while the radiation beam was so homogeneous across the field size.
In Vitro Antibacterial, Antifungal and Other Medical Properties of Endangered Medicinal Plant Seeds  [PDF]
Mohammed A. Almalki
Pharmacology & Pharmacy (PP) , 2017, DOI: 10.4236/pp.2017.85013
Abstract: The risk created by infectious microorganisms to humans attracted the development of common medicine. To find an alternative source, medicinal plants with diverse metabolites play an important role in curing the diseases and human disorders caused by microbial pathogens. Medicinal plants namely, Citrullus colocynthis, Hyoscyamus muticus, Ocimum basilicum, Amaranthus lividus, Salvia aegyptiaca and Ruta chalepensis are commonly used as a traditional medicine in Gulf countries. The present study aimed to investigate the antibacterial, antifungal and antioxidant potential of the organic crude extracts obtained from the seeds. Besides, the possible antimicrobial mechanisms of the extracts were evaluated by determining the enzyme activities. The antibacterial and antifungal activities of the crude extracts were evaluated by the broth micro dilution method and the effect of the extracts on the pathogens were determined by quantifying the alkaline phosphatase (ALP), lactate dehydrogenase (LDH) enzymes and intracellular protein leakage. Besides, the antioxidant properties were determined using hydroxyl radical scavenging assay, DPPH radical scavenging assay, reducing power assay and superoxide radical scavenging assay. Results indicated that the extracts of C. colocynthis showed promising activity against all the tested pathogens, especially the MIC values were ranged from 100 to 150 μg/ml for Gram positive bacteria and 100 to 250 μg/ml for Gram negative bacteria respectively. The MIC values of H. muticus, O. basilicum and R. chalepensis against the fungal pathogens were ranged from 100 to 500 μg/mL respectively. The ALP activity was higher in extract treated Klebsiella pneumoniae compared with control, whereas the LDH and protein concentrations for Escherichia coli and Staphylococcus aureus were comparatively higher. Furthermore, all the studied seed extract showed good antioxidant activities. In conclusion, the studied plant seed extracts documented good antimicrobial and antioxidant activities. Therefore, the medicinal plants would be the excellent source for natural antioxidant and antibacterial agents for medical and applications.
Modelling of a Residential Solar Energy Recuperation System Setup  [PDF]
Mohammed Alghassab, Mohamed A. Zohdy
Open Journal of Energy Efficiency (OJEE) , 2016, DOI: 10.4236/ojee.2016.54012
Abstract: Increased pollution levels have caused damage to our planet. Many scientists are now warning on the long term effects. Green houses gases causes more of the sunlight to be trapped within the Earth’s atmosphere and thus causing increased Earth temperature. Individuals, governments, and private entities are now acting on fixing this problem. One of the most promising solutions is installing an array of solar cells in residential areas. Doing so makes sense for areas with abundant sunlight as the dependency on the grid can be minimized and even completely illuminated while providing a feasible economic perspective at the same time. This paper presents the modelling of a residential setup as a complete system along with an electric vehicle. The modelled components include: Photovoltaic Cells, Home Load Usage, Electric Vehicle, High-Voltage battery as an energy storage, Boost, and Inverter. The presented analysis will help engineers and system designers do better cost analysis. The study can also be used as a basis for maximizing the solar energy usage and perform component optimization.
Restricted Three-Body Problem in Different Coordinate Systems  [PDF]
Mohammed A. Sharaf, Aisha A. Alshaery
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.39142
Abstract: In this paper of the series, the equations of motion for the spatial circular restricted three-body problem in sidereal spherical coordinates system were established. Initial value procedure that can be used to compute both the spherical and Cartesian sidereal coordinates and velocities was also developed. The application of the procedure was illustrated by numerical example and graphical representations of the variations of the two sidereal coordinate systems.
A Single-Center Experience of Systemic Onset Juvenile Idiopathic Arthritis at a Tertiary Hospital in Jeddah, Saudi Arabia  [PDF]
Wallaa A. Garout, Mohammed A. Muzaffer
Open Journal of Rheumatology and Autoimmune Diseases (OJRA) , 2014, DOI: 10.4236/ojra.2014.44029
Abstract: Background and Objective: Systemic-onset juvenile idiopathic arthritis (JIA) is a major and prevalent subset of arthritis among children and it has a broad spectrum of clinical presentation, course and prognosis. This study described the clinical presentation of systemic-onset JIA in a Saudi-based cohort. Methods: A retrospective chart review was performed of the medical records of children with systemic-onset JIA who were followed up at King Abdul Aziz University Hospital, Jeddah, between January 1997 and December 2013. Patients’ files were reviewed for demographic, clinical, and paraclinical data, which were analyzed using the statistical Package for the Social Sciences. Results: We included 20 patients of both genders (8 boys and 12 girls). The mean age of disease onset was 7 (4.5) years. The most common presenting symptoms were fever (100%), arthritis (100%), and rash (55%). Hepatomegaly (5%), abdominal (5%) and pulmonary manifestations (3%) were less frequent manifestations. Most patients had high white blood cell counts (50%), elevated erythrocyte sedimentation rates (80%) and C-reactive protein levels (90%). The interval between onset of symptoms and diagnosis was 9.4 (12.5) weeks. Patients were treated with non-steroidal anti-inflammatory drugs, methotrexate, steroids, anti-tumor necrosis agents, and disease-modifying anti-rheumatic drugs. Bone marrow biopsy was conducted to exclude malignancy in 20% of the patients. Conclusion: Saudi children with systemic-onset JIA present with prolonged fever and arthritis (mainly oligoarticular rather than polyarticular). Physicians should be aware of the presentation of systemic-onset JIA in our setting in order to make prompt diagnosis and treatment decisions as early as possible. Carful follow-up of febrile patients is paramount to reaching the diagnosis early and initiating treatment.
Case-mix and the use of control charts in monitoring mortality rates after coronary artery bypass
Tom Marshall, Mohammed A Mohammed
BMC Health Services Research , 2007, DOI: 10.1186/1472-6963-7-63
Abstract: Coronary artery bypass grafting mortality rates between 1994 and 2003 were obtained from the New York State Department of Health's cardiovascular reports for 41 hospitals. Cross-sectional control charts of crude (observed) and risk adjusted mortality rates were produced for each year. Special cause variation was defined as a data point beyond the 99.9% probability limits: hospitals showing special cause variation were identified for each year. Longitudinal control charts of crude (observed) and risk adjusted mortality rates were produced for each hospital with data for all ten years (n = 27). Special cause variation was defined as a data point beyond 99.9% probability limits, two out of three consecutive data points beyond 95% probability limits (two standard deviations from the mean) or a run of five consecutive points on one side of the mean. Years showing special cause variation in mortality were identified for each hospital. Cohen's Kappa was calculated for agreement between special causes identified in crude and risk-adjusted control charts.In cross sectional analysis the Cohen's Kappa was 0.54 (95% confidence interval: 0.28 to 0.78), indicating moderate agreement between the crude and risk-adjusted control charts with sensitivity 0.4 (95% confidence interval 0.17–0.69) and specificity 0.98 (95% confidence interval: 0.95–0.99). In longitudinal analysis, the Cohen's Kappa was 0.61 (95% confidence interval: 0.39 to 0.83) indicating good agreement between the tests with sensitivity 0.63 (95% confidence interval: 0.39–0.82) and specificity 0.98 (95% confidence interval: 0.96 to 0.99).There is moderate-good agreement between signals of special cause variation between observed and risk-adjusted mortality. Analysis of observed hospital specific CABG mortality over time and with other hospitals appears to be useful in identifying special causes of variation. Case-mix adjustment may not be essential for longitudinal monitoring of outcomes using control charts.Monitoring
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