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Guindy, N. E. M., H. A. E. A. Ghaffar, R. E. M. Refai, and R. E. E. Hawary, "Cytotoxic T lymphocyte antigen-4 gene polymorphism in systemic lupus erythematosus Egyptian patients", Comparative Clinical Pathology, vol. 24, issue 1, pp. 41-45, 2015. Abstract

The human cytotoxic T lymphocyte antigen-4 (CTLA-4) gene has been confirmed to be associated with several autoimmune diseases. In this study, we investigated the CTLA-4 gene polymorphism in systemic lupus erythematosus (SLE) Egyptian patients. A polymerase chain reaction was conducted to amplify CTLA-4 gene, followed by restriction fragment length polymorphism (RFLP) assay to detect candidate genetic polymorphism at positions -1722 T/C and -1661 A/G. Sixty SLE patients (55 females and 5 males) with mean age 28.5 ± 7 years and 40 healthy controls (31 females and 9 males) with mean age 27.8 ± 6.2 years were included in this study. The genotypic distribution at position -1661 of CTLA-4 gene was GG (11.7 %), AA (70 %), and AG (18.3 %) in SLE patients versus GG (20 %), AA (65 %), and AG (15 %) in the control (P value 0.508); regarding the position -1772 of CTLA-4 gene, the distribution was TT (83.3 %) and TC (16.7 %) in SLE patients versus TT (77.5 %) and TC (22.5 %) in the controls (P value 0.466). On studying the clinicopathological impact of the studied single nucleotide polymorphism (SNPs) with the disease severity, there is a statistical significance (P = 0.011) for the presence of AA genotype and severity of disease at -1661 genotype. AA genotype at -1661 was protective against discoid rash (P = 0.005), TC genotype at -1772 site is protective against serositis (P = 0.05), and serositis occurs more commonly with the AG genotype at -1661 site (P = 0.038). In our study, we concluded that the studied SNPs at positions -1772 and -1661 of CTLA-4 gene were not associated with SLE risk in Egyptian population.

Guindy, N. M.  E., H. A.  A. E. Ghaffar, R. M.  E. Refai, and R. E.  E. Hawary, "Cytotoxic T lymphocyte antigen-4 gene polymorphism in systemic lupus erythematosus Egyptian patients", comparative clinical pathology, vol. 22, issue 1618-5641, 2013.
Guirgis, O. W., S. A. Elawam, W. M. Morsi, and H. A. M. Shady, "Optical properties study of PMMA/PbO(NP's) composites films", Materials science, vol. 14, issue 12, pp. 471-483, 2016. optical_prop.pdf
Guirguis, O. W., and M. T. H. Moselhey, "Optical study of poly(vinyl alcohol)/hydroxypropyl methylcellulose blends", Journal of Materials Science, vol. 46, no. 17: Springer US, pp. 5775-5789, 2011. AbstractCU-PDFWebsite

The proposal in this study was to evaluate the optical properties of different biopolymers films. The materials used were poly(vinyl alcohol) (PVA) and hydroxypropyl methylcellulose (HPMC). PVA/HPMC blends were prepared by casting technique. Variations in the group coordination in the infrared region were followed. The effects of HPMC concentrations on the optical properties of the PVA films were studied by near infrared, ultraviolet/visible, transmittance, and reflectance in the spectral region 200–2500 nm. Absorption, transmittance, and reflectance spectra were used for the determination of the optical constants. The study has been also extended to include the changes in the optical parameters including the band tail width and band gap energies and extinction coefficient for the investigated films. The results indicate that the optical band gap was derived from Tauc’s extrapolation and decreases with the HPMC contents. The obtained optical parameters were found to be strongly affected by HPMC contents.

Guirguis, O. W., M. A. F. H. Elkader, and A. A. Nasrat, "Enhancing antimicrobial activity for chitosan by adding Jojoba liquid wax", Materials Letters, vol. 93, pp. 353 - 355, 2013. AbstractCU-PDFWebsite

The purpose of the present study is to enhance the antimicrobial activity of chitosan. For this reason, thin films of chitosan incorporated with different concentrations of Jojoba liquid wax (JLW) were prepared by using the casting technique. The agar disc diffusion method was used to investigate the antimicrobial activity of the films against two different microorganisms namely Staphylococcus aureus and Bacillis subtilis. The results indicated that as the concentration of \{JLW\} increases the antimicrobial activity for S. aureus and B. subtilis increases. Moreover, it is found that the minimum inhibitory concentration (MIC) values for both systems decrease by increasing the amount of the antimicrobial agent Jojoba with chitosan. In conclusion, the data obtained reveal that chitosan has a great potential to improve its antimicrobial activity by incorporating with antimicrobial agent.

Guirguis, J. E. B., and S. S. F. Mehanny, "Evaluating Codes Criteria for Regular Seismic Behavior of Continuous Concrete Box Girder Bridges with Unequal Height Piers", ASCE Journal of Bridge Engineering, vol. 18, issue 6, pp. 486-498, 2013.
Guirguis, D., M. Aly, K. Hamza, and H. Hegazi, "Multi-Objective Topology Optimization of Multi-Component Continuum Structures via a Kriging-Interpolated Level-Set Approach", Structural and Multidisciplinary Optimization, vol. 51, issue 3, pp. 733-748, 2015.
Guirguis, O. W., M. F. H. Abd Elkader, and A. A. Nasrat, "Enhancing antimicrobial activity for chitosan by adding Jojoba liquid wax", Materials Letters, vol. 93: North-Holland, pp. 353–355, 2013. Abstract
Guirguis, O. W., and M. T. H. Moselhey, "Optical Study of Poly(vinyl alcohol)/ Hydroxypropyl Methylcellulose Blends", Journal of Materials Science, 2011. Abstract
Gulati, A., A. Math, V. Sreeniwas, P. Hari, A. Bagga, J. Miao, Q. Fan, H. Zhang, L. Chen, S. Zhu, et al., "Paediatric nephrology", NDT Plus, vol. 2, no. suppl 2: Oxford University Press, pp. ii2245, 2009. Abstract
Guldner, C., I. Diogo, E. Bernd, S. Drager, M. Mandapathi, A. Teymoortash, H. Negm, and T. Wilhelm, "Visualization of anatomy in normal and pathological middle ears by cone beam CT", Eur Arch Otorhinolaryngol, vol. 274, issue 2, pp. 737-742, 2017.
Guler, R., T. Mpotje, M. Ozturk, J. K. Nono, S. P. Parihar, J. E. Chia, N. A. Aziz, L. Hlaka, S. Kumar, S. Roy, et al., "Batf2 differentially regulates tissue immunopathology in Type 1 and Type 2 diseases.", Mucosal immunology, 2018 Dec 12. Abstract

Basic leucine zipper transcription factor 2 (Batf2) activation is detrimental in Type 1-controlled infectious diseases, demonstrated during infection with Mycobacterium tuberculosis (Mtb) and Listeria monocytogenes Lm. In Batf2-deficient mice (Batf2), infected with Mtb or Lm, mice survived and displayed reduced tissue pathology compared to infected control mice. Indeed, pulmonary inflammatory macrophage recruitment, pro-inflammatory cytokines and immune effectors were also decreased during tuberculosis. This explains that batf2 mRNA predictive early biomarker found in active TB patients is increased in peripheral blood. Similarly, Lm infection in human macrophages and mouse spleen and liver also increased Batf2 expression. In striking contrast, Type 2-controlled schistosomiasis exacerbates during infected Batf2 mice with increased intestinal fibro-granulomatous inflammation, pro-fibrotic immune cells, and elevated cytokine production leading to wasting disease and early death. Together, these data strongly indicate that Batf2 differentially regulates Type 1 and Type 2 immunity in infectious diseases.

Gulzar, S., Hameed, A., Alatar, A. A., A. K. Hegazy, and M. A. Khan, "Seed germination ecology of Cyperusarenarius – a sandbinder from Karachi coast. ", PakistanJournal ofBotany , vol. 45, issue 2, pp. 493-496, 2013.
Gumaa, M., A. Khaireldin, and A. R. Youssef, "Validity and Reliability of Interactive Virtual Reality in Assessing the Musculoskeletal System: a Systematic Review.", Current reviews in musculoskeletal medicine, vol. 14, issue 2, pp. 130-144, 2021. Abstract

PURPOSE OF REVIEW: Assessment of the musculoskeletal system requires consideration of its integrated function with the nervous system. This may be assisted by using valid and reliable methods that simulate real-life situations. Interactive virtual reality (VR) technology may introduce various auditory and visual inputs that mimic real-life scenarios. However, evidence supporting the quality and strength of evidence regarding the adequacy of its psychometric properties in assessing the musculoskeletal function has not been evaluated yet. Therefore, this study reviewed the validity and reliability of VR games and real-time feedback in assessing the musculoskeletal system.

RECENT FINDINGS: Nine studies were included in quality assessment. Based on outcome measures, studies were categorized into range of motion (ROM), balance, reaction time, and cervical motion velocity and accuracy. The majority of the studies were of moderate quality and provided evidence of VR adequate concurrent and, in some cases, known-groups validity. Also, VR showed high intra-rater reliability for most of the measured outcomes. Based on the included studies, there is a limited promising evidence that interactive VR using games or real-time feedback is highly valid and reliable in assessing ROM in asymptomatic participants and patients with chronic neck pain and radial fracture. For the remaining outcomes, evidence is limited to draw a robust conclusion. Future studies are recommended to test VR psychometric properties in different patients' population using a rigor research methodology.

Gumaa, M., and A. R. Youssef, "Is Virtual Reality Effective in Orthopedic Rehabilitation? A Systematic Review and Meta-Analysis", Physical Therapy, vol. 99, issue 10, pp. 1304 - 1325, 2019. AbstractWebsite
Gumaa A. El-Nagar, Mohamed S. El-Deab, A. M. B. E. - A. M. E., "Promoting Effect of Hydrocarbon Impurities on the Electro-Oxidation of Formic Acid at Pt Nanoparticles Modified GC Electrodes", Electrochimica Acta, issue Elsevier, pp. doi: 10.1016/j.electacta.2015.08.119, 2015. Abstract
Gumaa A. El-Nagar, Mohamed S. El-Deab, A. M. B. E. - A. M. E., "Promoting Effect of Hydrocarbon Impurities on the Electro-Oxidation of Formic Acid at Pt Nanoparticles Modified GC Electrodes", Electrochimica Acta, issue Elsevier, pp. doi: 10.1016/j.electacta.2015.08.119, 2015. Abstract
Gumaa A. El-Nagar, Ahmed F. Darweesh, I. S., "A novel nano-palladium complex anode for formic acid electro-oxidation", Electrochimica Acta, vol. 215, issue 10: Elsevier Ltd., pp. 334-338, 2016. Abstract
Gunawan, A., S. Sahadevan, C. Neuhoff, C. Große-Brinkhaus, A. Gad, L. Frieden, D. Tesfaye, E. Tholen, C. Looft, M. J. Uddin, et al., "RNA deep sequencing reveals novel candidate genes and polymorphisms in boar testis and liver tissues with divergent androstenone levels.", PloS one, vol. 8, issue 5, pp. e63259, 2013. Abstract

Boar taint is an unpleasant smell and taste of pork meat derived from some entire male pigs. The main causes of boar taint are the two compounds androstenone (5α-androst-16-en-3-one) and skatole (3-methylindole). It is crucial to understand the genetic mechanism of boar taint to select pigs for lower androstenone levels and thus reduce boar taint. The aim of the present study was to investigate transcriptome differences in boar testis and liver tissues with divergent androstenone levels using RNA deep sequencing (RNA-Seq). The total number of reads produced for each testis and liver sample ranged from 13,221,550 to 33,206,723 and 12,755,487 to 46,050,468, respectively. In testis samples 46 genes were differentially regulated whereas 25 genes showed differential expression in the liver. The fold change values ranged from -4.68 to 2.90 in testis samples and -2.86 to 3.89 in liver samples. Differentially regulated genes in high androstenone testis and liver samples were enriched in metabolic processes such as lipid metabolism, small molecule biochemistry and molecular transport. This study provides evidence for transcriptome profile and gene polymorphisms of boars with divergent androstenone level using RNA-Seq technology. Digital gene expression analysis identified candidate genes in flavin monooxygenease family, cytochrome P450 family and hydroxysteroid dehydrogenase family. Moreover, polymorphism and association analysis revealed mutation in IRG6, MX1, IFIT2, CYP7A1, FMO5 and KRT18 genes could be potential candidate markers for androstenone levels in boars. Further studies are required for proving the role of candidate genes to be used in genomic selection against boar taint in pig breeding programs.

hanan farouk gunied, "رؤية الجمهور العربى لأبعاد المسؤولية الإجتماعية للمؤسسات الإعلامية والعوامل المؤثرة فيها. Arab Audience View For The Media Organizations Social Responsibility Dimensions And The Factors Affecting It.", المجلة الدولية للاتصال الاجتماعي, vol. Volume 5, , issue Numéro 4, pp. , Pages 82-129, 2018. Abstract

The research problem in this study focus on discovering the level ,and degree of national social responsibility for the media organizations ,and the extent of the role it plays ,from the arab audience view,and how it concern in transmitting the news and various topics ,in addition to the effect of professional values of media practices on the social responsibility of these media organizations. حاول الدراسة الكشف عن مستوى ودرجة المسؤولية الإجتماعية والوطنية للمؤسسات الإعلامية ومدى قيامها بأبعاد هذا الدور من وجهة نظر الجمهور العربى والتعرف على مدى اهتمام المؤسسات الإعلامية بالمسؤولية الاجتماعية تجاه الجمهور في نقل الأخبار والموضوعات المختلفة, وتأثير القيم المهنية للعمل الإعلامي على المسؤولية الاجتماعية في المؤسسات الإعلامية وذلك من خلال دراسة مسحية على عينة من الجمهور العام العربى . الكلمات المفتاحية المسؤولية الإجتماعية. . المؤسسات الإعلامية. الجمهور . نقل الاخبار.تطبيقات نظريات الاعلام و الاتصال التقليدية في فضاءات الإعلامية ذلك من خلال دراسة مسحية على عينة من الجمهور العام العرب

Gunnell, G. F., A. J. Winkler, E. R. Miller, J. J. Head, A. N. El-Barkooky, M. Abdel Gawad, W. J. Sanders, and P. D. Gingerich, "Small vertebrates from Khasm El-Raqaba, late Middle Miocene, Eastern Desert, Egypt", HISTORICAL BIOLOGY , vol. 28, issue 1-2, pp. 159-171, 2016.