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Oaks, J. A., and H. M. Alkhateeb, "Māl, enunciations, and the prehistory of Arabic algebra", Historia Mathematica, vol. 32, no. 4, pp. 400 - 425, 2005. AbstractWebsite

Medieval Arabic algebra books intended for practical training generally have in common a first “book” which is divided into two sections: one on the methods of solving simplified equations and manipulating expressions, followed by one consisting of worked-out problems. By paying close attention to the wording of the problems in the books of al-Khwārizmī, Abū Kāmil, and Ibn Badr, we reveal the different ways the word māl was used. In the enunciation of a problem it is a common noun meaning “quantity,” while in the solution it is the proper noun naming the square of “thing” (shay '). We then look into the differences between the wording of enunciations and equations, which clarify certain problems solved without “thing,” and help explain the development of algebra before the time of al-Khwārizmī.

Obach, D., S. Deuffic-Burban, G. Esmat, W. A. Anwar, S. Dewedar, V. Canva, A. Cousien, W. Doss, A. Mostafa, S. Pol, et al., "Effectiveness and cost-effectiveness of immediate versus delayed treatment of hepatitis C virus-infected patients in a country with limited resources: the case of Egypt.", Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, vol. 58, issue 8, pp. 1064-71, 2014 Apr. Abstract

BACKGROUND: Because of logistical and economic issues, in Egypt, as in other resource-limited settings, decision makers should determine for which patients hepatitis C virus (HCV) treatment should be prioritized. We assessed the effectiveness and cost-effectiveness of different treatment initiation strategies.

METHODS: Using a Markov model, we simulated HCV disease in chronically infected patients in Egypt, to compare lifetime costs, quality-adjusted life expectancy (QALE), and the incremental cost-effectiveness ratio (ICER) of different treatment initiation strategies.

RESULTS: Immediate treatment of patients at stages F1/F2/F3 was less expensive and more effective than delaying treatment until more severe stages or not providing treatment (in patients diagnosed at F1: QALE = 18.32 years if treatment at F1 vs 18.22 if treatment at F2). Treatment of F4 patients was more effective than no treatment at all (QALE = 10.33 years vs 8.77 years) and was cost-effective (ICER = $1915/quality-adjusted life-year [QALY]). When considering that affordable triple therapies, including new direct-acting antivirals, will be available starting in 2016, delaying treatment until stage F2, then treating all patients regardless of their disease stage after 2016, was found to be cost-effective (ICER = $33/QALY).

CONCLUSIONS: In Egypt, immediate treatment of patients with fibrosis stage F1-F3 who present to care is less expensive and more effective than delaying treatment. However, immediate treatment at stage F1 is only slightly more effective than waiting for disease to progress to stage F2 before starting treatment and is sensitive to the forthcoming availability of new treatments. Treating patients at stage F4 is highly effective and cost-effective. In Egypt, decision makers should prioritize treatment for F4 patients and delay treatment for F1 patients who present to care.

Obach, D., S. Deuffic-Burban, G. Esmat, W. A. Anwar, S. Dewedar, V. Canva, A. Cousien, W. Doss, A. Mostafa, S. Pol, et al., "IMMEDIATE vs. DELAYED TREATMENT IN GENOTYPE 4-HCV INFECTED PATIENTS IN A LIMITED RESOURCES COUNTRY: A COST-EFFECTIVENESS ANALYSIS IN EGYPT (ANRS 12215)", JOURNAL OF HEPATOLOGY, vol. 58, no. 1}, Meeting Abstract = {885, pp. S364, APR, 2013. Abstract
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Obach, D., Y. Yazdanpanah, G. E. Esmat, V. Canva-Delcambre, S. Dewedar, W. A. Anwar, W. H. Doss, A. Mostafa, S. Pol, M. Buti, et al., "Impact of different treatment scale-up and eligibility scenarios on HCV mortality in egypt in the next five years", HEPATOLOGY, vol. 56, no. 1}, Meeting Abstract = {1759, pp. 1012A, OCT, 2012. Abstract
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Obaia, A. R., and M. M. Ibrahim, "Physical and aerodynamic property of some agricultural crops", Egypt. J. Agric. Res , vol. 93 , issue 5-B, pp. 577 – 585., 2015. 1_physical_and_aerodynamic_properties_of_some_agricultural_crop.pdf
Obaid, N., S. E. Hadidy, M. E. Badry, and H. Khaled, "The Outcome of Diabetic Patients with Cardiomyopathy in Critical Care Unit: Hospital and Short-Term Outcome in a Period of Six Months to One Year", Open Access Macedonian Journal of Medical Sciences, vol. 7, issue 17, pp. 2796-2801, 2019.
Obaidat, A. ’T., A. Ashour, and K. Galal, "Stress-Strain Behavior of C-Shaped Confined Concrete Masonry Boundary Elements of Reinforced Masonry Shear Walls", Journal of Structural Engineering, vol. 144, issue 8, 2018.
Obaidat, A. ', A. Ashour, and K. Galal, "Stress-strain model for C-shape confined concrete masonry boundary elements of RM shear walls", Engineering Structures, vol. 183, pp. 1059-1071, 2019.
Obayah, G. M., A. Refaie, O. Aboushanab, N. Ibraheem, and M. Abdelazees, "Addition of dexmedetomidine to bupivacaine for greater palatine nerve block prolongs postoperative analgesia after cleft palate repair", Eur J Anaesthesiol, vol. 27, pp. 280–284, 2010. Abstract

Background and objective The effect of dexmedetomidine on
the duration of sensory blockade has not been studied in
humans. We evaluated the effect of adding dexmedetomidine to
bupivacaine on the duration of postoperative analgesia in
children who underwent repair of a cleft palate.
Methods Thirty children who were scheduled for repair of a
complete cleft palate using a combination of general
anaesthesia and greater palatine nerve block were allocated
randomly into one of two equal groups (n¼15). In both groups,
the greater palatine nerve block was performed bilaterally using
0.5 ml of solution on each side. The B group received
bupivacaine 0.25%, whereas the BD group received
bupivacaine 0.25% with 1mgkg1 dexmedetomidine. Heart
rate, systolic blood pressure, pain score, the time to the first
request for analgesia, and the degree of sedation were
recorded.
Results There was no difference in haemodynamic variables
between the two groups. The pain score was significantly higher
in the B group as compared with the BD group. The time to the
first request for analgesia was significantly longer in children in
the BD group (mean 22 h, range 20.6–23.7 h) as compared
with those who received bupivacaine alone (14.2 h, 13–15 h).
Sedation scores in the postoperative period did not differ
between the study groups.
Conclusion Greater palatine nerve block with a combination of
dexmedetomidine and bupivacaine increased the duration of
analgesia after repair of a cleft palate by 50% with no clinically
relevant side effects.
Eur J Anaesthesiol 2010;27:280–284
Keywords: cleft palate, dexmedetomidine, palatine nerve block

Obeida, A., N. Abdelmoemen, N. Ibrahim, and A. Shalaby, "Neonatal gastric perforation secondary to a strangulated congenital diaphragmatic hernia", Journal of Pediatric Surgery Case Reports, vol. 36, pp. 47-49, 2018. obeida2018.pdf
Obeida, A., and A. Shalaby, "Management of Gastroschisis", Pediatric Surgery, Flowcharts and Clinical Algorithms: InTechOpen, 2019. obeida2019.pdf
Obeida, A., A. Shalaby, D. Khairy, and K. Bahaaeldin, "Assessment of gastroschisis risk factors in Egypt", Journal of Pediatric Surgery, vol. 55, issue 2, pp. 292-295, 2019. shalaby2019.pdf
Obeidah, A., "relationship between hatachability and interior egg characteristics in Fayoumi", Egyptian journal of animal production, 1976. Abstract
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Obeidah, A., H. M. Morad, A. A. Sami, and A. Mostageer, "Genetic and phenotypic parameters of egg production and some constituents of blood serum in Fayoumi layers", Annales de Génétique et de Sélection Animale, vol. 10, issue 1: EDP Sciences, pp. 47-60, 1978. Abstract
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Obeidah, A., H. M. Morad, A. A. Sami, and A. Mostageer, "Genetic and phenotypic parameters of egg production and some constituents of blood serum in Fayoumi layers", Annales de genetique et de selection animale, vol. 10, issue 1: EDP Sciences, pp. 47-60, 1978. Abstract
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Obeidah, A., A. Bordas, and P. Merat, "Contribution al'etude de l'heredite de la ponte et de l'efficacite alimentaire de la poule en condition climatique chaude.", Annales de Genetique et de Selection Animale, vol. 10, 1978. Abstract
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Obeidah, A., A. Bordas, and P. Mérat, "Contribution to the study of inheritance of laying performance and feed efficiency in the fowl under hot climatic conditions", Annales de genetique et de selection animale, vol. 10, issue 1: EDP Sciences, pp. 61-72, 1978. Abstract
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Obeidah, A., and M. É. R. A. T. L. DURAND, Polymorphism of egg white proteins egg weight and components weight, , 1977. Abstract
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Obeidah, A., A. Mostageer, and M. M. Shafie, "Genetic and phenotypic parameters of body temperature and respiration rate in fayoumi chicks", Ann. Génét. Sél. Anim, vol. 6, pp. 267-274, 1974. Abstract
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Obeidah, A., "The relationship between rectal temperature, respiration rate and body weight in rabbits", Egyptian Journal of Animal Production, vol. 15, 1975. Abstract
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Obeidah, A., P. Merat, and A. Bordas, "Polydipsie et polyurie a temperature ambiante elevee en association avec les caracteres de production chez la poule.", Annales de Genetique et de Selection Animale, vol. 9, 1977. Abstract
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