Medicine, Saudi Arabia
Medicine, Saudi Arabia

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Ahmad M.,Jamia Millia Islamia University | AlSharari H.D.,uf University
Advances in Intelligent Systems and Computing | Year: 2017

A new digital image watermarking scheme based on chaotic map was proposed to hide the sensitive information known as watermark. The authors claimed that the scheme is efficient, secure, and highly robust against various attacks. In this paper, the inherent security loopholes of the watermarking embedding and extraction processes are unveiled. The cryptanalysis of water-marking scheme is presented to demonstrate that the scheme is not robust and secure against the proposed attack. Specifically, with chosen host image and chosen watermarks, the successful recovery of securely embedded watermark from received watermarked image is possible without any knowledge of secret key. The simulation analysis of proposed cryptanalysis is provided to exemplify the proposed attack and lack of security of anticipated watermarking scheme. © Springer Nature Singapore Pte Ltd. 2017.

Alhazmi A.H.,uf University
Journal of the Pakistan Medical Association | Year: 2011

Objectives: To investigate the frequency of irritable bowel syndrome (IBS), and symptoms compatible with this condition among male students studying in secondary schools for boys in AlJouf province of Saudi Arabia. Methods: A cross sectional study was conducted in April 2009, AlJouf province of Saudi Arabia, involving a self administered questionnaire (translated in Arabic) based on Manning and Rome II criteria for diagnosis of IBS that was distributed to 2025 students at secondary school for boys, by convenience sampling. About 86.3% (1747) completed the questionnaire. Sample size was calculated using Epi. Info 6.4, seat calculator. Results: The prevalence of IBS was 8.9 % and 9.2 % according to Manning and Rome II criteria for diagnosis of IBS respectively in the study subjects with mean age of 17.5±3 years and range of 15-23 years. The most common symptom compatible with IBS was abdominal pain or discomfort in 37.9% of our sample, followed by feeling of incomplete rectal evacuation after defecation in 32.2% of the same sample. Recurrent abdominal pain or discomfort caused increase in rates of absence from schools in 28.2% of affected students (p<0.05). There is a statistically significant association between family size and clusters of symptoms compatible with IBS (p<0.045). Conclusion: IBS is common health problem in apparently healthy males studying in secondary schools for boys in AlJouf province of Saudi Arabia. Symptoms suggestive of this condition leading to a negative impact on their quality of life measures, and school performance. Early diagnosis and health education of this condition are imperative.

Introduction: Peri-implant tissue health is a requisite for success of dental implant therapy. Plaque accumulation leads to initiation of gingivitis around natural teeth and peri-implantitis around dental implants. Peri-implantitis around dental implants may result in implant placement failure. For obtaining long-term success, timely assessment of dental implant site is mandatory. Aim: To assess and evaluate Quality of Life (OHRQoL) of individuals with dental implants using the Oral Health Impact Profile (OHIP-14). Materials and Methods: Total 92 patients were evaluated for assessment of the health of peri-implant tissues by recording, Plaque Index (PI), Probing Pocket Depth (PD), Bleeding On Probing (BOP) and Probing Attachment Level (PAL) as compared to contra-lateral natural teeth (control). In the same patients Quality of Life Assessment was done by utilizing Oral Health Impact Profile Index (OHIP-14). Results: The mean plaque index around natural teeth was more compared to implants and it was statistically significant. Other three dimensions mean bleeding on probing; mean probing attachment level and mean pocket depth around both natural teeth and implant surfaces was found to be not statistically significant. OHIP-14 revealed that patients with dental implants were satisfied with their Oral Health-Related Quality of Life (OHRQoL). Conclusion: Similar inflammatory conditions are present around both natural teeth and implant prostheses as suggested by results of mean plaque index, mean bleeding on probing, mean pocket depth and mean probing attachment level, hence reinforcing the periodontal health maintenance both prior to and after incorporation of dental implants. Influence of implant prostheses on patient’s oral health related quality of life (as depicted by OHIP-14) and patients’ perceptions and expectations may guide the clinician in providing the best implant services. © 2016, Journal of Clinical and Diagnostic Research. All rights reserved.

Germoush M.O.,uf University
Life Science Journal | Year: 2014

The current study aimed to investigate the protective effect of hesperidin against hyperammonemiainduced inflammation and oxidative stress. Hyperammonemia was induced by daily intraperitoneal injection of 100 mg/kg body weight ammonium chloride for 8 weeks. Administration of ammonium chloride induced hyperammonemia as evident by the significant increase in blood ammonia and urea levels. In addition, hyperammonemic rats exhibitedsignificantly increased brain lipid peroxidation as well as declined glutathione content and glutathione peroxidase and superoxide dismutase activities. Moreover, hyperammonemia induced a significant increase in serum tumor necrosis factor alpha (TNF-α) accompanied with significant upregulation of brain TNF-α mRNA expression. Concomitant administration of the flavonoid hesperidinsignificantlyameliorated the altered parameters. In conclusion, hesperidinprotects against hyperammonemia-induced oxidative stress and inflammation, demonstrating its antioxidant and anti-inflammatory efficacies.

Background/Aim: Primary health care (PHC) physicians manage most patients with irritable bowel syndrome (IBS). In Saudi Arabia, there are limited data on their knowledge, attitudes, and practices about this disorder. This study aimed to assess knowledge, attitudes, and practices of primary care physicians about IBS. Patients and Methods: A cross-sectional survey of 70 practitioners aged 36 10.25 years was carried out in primary care centers in AlJouf Province of Saudi Arabia. The physicians were asked to fill a valid questionnaire containing their sociodemographic data, and well-modified questions regarding their knowledge, attitudes, and practices about IBS. Data was processed and analyzed using SPSS (version 15) program, and the level of significance was set at P<0.05. Results: A response rate of 92.9% yielded 65 questionnaires for analysis. Majority of physicians surveyed (83.1%) considered IBS as a common health problem in Saudi Arabia, and (55.4%) believed it is underestimated. There was a significant association between physicians qualifications and using diagnostic tools to facilitate IBS diagnosis (14.3% vs 35.5%; P<0.05), while utilization of "Rome or Manning criteria" was more frequent by physicians with masters degree (35.5%) compared to residents (14.3%). Also, 35.4% of physicians (15 males and 8 females) were not sure how to diagnose IBS. Conclusions: This study suggested that PHC physicians had a suitable attitude toward IBS, but they lacked knowledge, and their practices toward this condition were inappropriate.

Patil S.R.,uf University
Journal of Oral Biology and Craniofacial Research | Year: 2015

Aim: The aim of the present study was to determine the prevalence of and the relationship between pulp and renal in affected patients and in healthy adults. Materials and methods: A total of 240 patients participated in the study. Group A consisted of 120 patients who had renal calculi and Group B had 120 randomly selected controls for the study. The periapical radiographs for all patients were evaluated for the presence or absence of the narrowing of dental pulp chambers and pulp canals. The radiographs were also evaluated to determine the presence or absence of pulp stones. The results were compared and analyzed using the Chi-square test (p < 0.001). Results: A total of 164 patients had pulp narrowing and 112 patients had pulp stones, which included 55 controls and 57 renal calculi patients. There was no statistical correlation between pulp narrowing and renal stones (p > 0.001) and also between pulp stones and renal stones (p > 0.001). Conclusion: However, there was no significant correlation between the presence of pulp stones and renal stones, and the incidental findings of pulp stones on periapical radiographs can provide useful information in the early diagnosis of the systemic calcifications. © 2015 Craniofacial Research Foundation.

Kandil T.,uf University
Proceedings - 2015 International Symposium on Smart Electric Distribution Systems and Technologies, EDST 2015 | Year: 2015

Micro Grids (MG) have recently gained a lot of momentum in power industry due to market deregulation and environmental concerns. One of the most technical challenges facing MGs is islanding of distributed generators. The current industry practice is to disconnect all distributed generators immediately after the occurrence of islands within 200 to 350 ms after loss of main supply. To achieve such goal, each DG must be equipped with an islanding detection device. Frequency relays are one of the most commonly used loss of mains detection method. However, distribution utilities may be faced with concerns related to false operation of these frequency relays due to improper settings or presence of harmonics generating loads (nonlinear loads). This paper investigates the performance of the frequency relay due to faults at the point of common coupling (PCC) with utility and due to active and reactive power mismatches at the generator bus. Further, the relay operation in the presence of nonlinear loads at the point of common coupling is analyzed. Finally, the relay setting can be accurately determined based on these investigation and analysis. © 2015 IEEE.

Alzarea B.K.,uf University
Journal of Animal and Veterinary Advances | Year: 2014

Animal experimental models are widely used in medical sciences in general and particularly in dentistry. The reasons for using animal models in dentistry are varied and included satisfying study hypothesis, understanding of progression of pathogenesis of certain diseases including periodontitis. Animal models are also used for other scientific aspects such as testing new medicines prior to their applications in clinical practice. The main challenge is how to select the appropriate animal experimental model. In this review, we reviewed various proposed models to be used in dentistry. Which models to be used and when to be used and what are the conditions that determine the right selection were discussed. Taken together, the use of animal models in dentistry is crucial to establish new findings, prove hypothesis of the study. There are many animal models that have been proposed to be used in dental experiments. Actually, there is no unique animal model for all disease and accordingly, animal model has to be carefully selected. © Medwell Journals, 2014.

Alzarea B.K.,uf University
Journal of Clinical and Diagnostic Research | Year: 2015

Orthopantomograms are very useful in detecting the pathologies affecting the teeth, development disorders of jaws, foreign bodies, fractures and other hard tissue variations [1]. Calcifications of various structures located in the head and neck region are a relatively common and are detected on routine panoramic radiographs. Three cases with unusual calcification seen incidentally during radiographic examination are reported here. © 2015, Journal of Clinical and Diagnostic Research. All rights reserved.

The present study was designed to evaluate the effect of two marine brown algae, Padina pavonia and Turbenaria ornate, on serum and adipose tissue tumor necrosis factor alpha (TNF-α) and oxidative stress in type 2 diabetic rats. Type 2 diabetes was induced by intraperitoneal injection of 120 mg/kg b.w. nicotinamide 30 minutes before injection of 50 mg/kg b. w. streptozotocin. Extracts of both Padina pavonia and Turbenaria ornate were orally and daily administered at a dose level of 100 mg/kg b.w. for 21 days to diabetic rats. In the diabetic control group, levels of glucose were significantly increased, while serum insulin level was decreased. Hepatic lipid peroxidation was significantly increased in diabetic rats as compared to normal ones. On the other hand, glutathione content and antioxidant activities were significantly decreased. Both tested algal extracts reversed these parameters nearly back to control values. In addition, both algae significantly down-regulated adipose tissue TNF-α mRNA expression in conjunction with decreased serum TNF-α. In conclusion, Padina pavonia and Turbenaria ornate extracts exert protection to type 2 diabetic rats through their antioxidant and anti-inflammatory efficacies.

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