Publications by authors named "Ahmed Elgazzar"

6 Publications

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Simple mathematical models for controlling COVID-19 transmission through social distancing and community awareness.

Authors:
Ahmed S Elgazzar

Z Naturforsch C J Biosci 2021 Apr 16. Epub 2021 Apr 16.

Mathematics Department, Faculty of Science, Arish University, 45516, Arish, Egypt.

The novel COVID-19 pandemic is a current, major global health threat. Up till now, there is no fully approved pharmacological treatment or a vaccine. Also, its origin is still mysterious. In this study, simple mathematical models were employed to examine the dynamics of transmission and control of COVID-19 taking into consideration social distancing and community awareness. Both situations of homogeneous and nonhomogeneous population were considered. Based on the calculations, a sufficient degree of social distancing based on its reproductive ratio is found to be effective in controlling COVID-19, even in the absence of a vaccine. With a vaccine, social distancing minimizes the sufficient vaccination rate to control the disease. Community awareness also has a great impact in eradicating the virus transmission. The model is simulated on small-world networks and the role of social distancing in controlling the infection is explained.
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http://dx.doi.org/10.1515/znc-2021-0004DOI Listing
April 2021

Coopetition in quantum prisoner's dilemma and COVID-19.

Authors:
Ahmed S Elgazzar

Quantum Inf Process 2021 10;20(3):102. Epub 2021 Mar 10.

Mathematics Department, Faculty of Science, Arish University, 45516 Arish, Egypt.

Decision-making is important especially during a crisis such as the novel COVID-19 pandemic. The quantum prisoner's dilemma with two dilemma strength parameters is introduced as a model for the interaction between pharmaceutical and other related enterprises during the pandemic. Novel Nash equilibria are identified. The coopetition equilibrium (simultaneous cooperation and competition) is emphasized. Motivated by the novel equilibria of the quantum version, a classical mixed-strategy formulation that can be applied to real-world situations is proposed. Suitable values of the dilemma strength parameters and quantum entanglement can encourage coopetition, which can be considered as a route to full cooperation.
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http://dx.doi.org/10.1007/s11128-021-03054-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7943713PMC
March 2021

Insight Study on the Comparison between Zinc Oxide Nanoparticles and Its Bulk Impact on Reproductive Performance, Antioxidant Levels, Gene Expression, and Histopathology of Testes in Male Rats.

Antioxidants (Basel) 2020 Dec 31;10(1). Epub 2020 Dec 31.

Department of Animal Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine, Alexandria University, 22785 Alexandria, Egypt.

Despite the beneficial effects of zinc oxide nanoparticles (ZnONPs) on different biomedical applications, including their antioxidant and anti-inflammatory ones, it might have cytotoxic and genotoxic impacts on the male reproductive system. The current study compares the effect of zinc oxide nanoparticles and their bulk form, at different doses, on male rats' reproductive performance, testicular antioxidants, gene expression, and histopathology. Thirty male rats were randomly allocated equally in five groups. The control one was injected with Tween 80 (10%). The zinc oxide nanoparticle (ZnONP) groups received ZnONPs < 50 nm, specifically, 5 mg/kg (ZnONP-1) and 10 mg/kg (ZnONP-2). The bulk zinc oxide (BZnO) groups were administered 5 mg/kg (BZnO-1) and 10 mg/kg (BZnO-2), correspondingly. Rats were injected intraperitoneally with the respected materials, twice/week for eight consecutive weeks. Finally, the male rats' sexual behavior and their pup's performance were determined in a monogamous mating system. Rats were then anesthetized and sacrificed for semen characteristics evaluation and tissue collection for antioxidant and hormones analysis, gene expression, and histopathological examination. It was shown that ZnONP-1 improved sexual behavior, semen characteristics, and pup's performance compared to its bulk form. Similarly, the testicular antioxidants activity, glutathione (GSH), and superoxide dismutase (SOD) increased with a decrease in the malonaldehyde (MDA), interleukin 6 (IL-6), and tumor necrosis factor (TNF-α) levels. It also improves the reproductive hormone levels and mRNA expression of different steroidogenesis-associated genes and anti-apoptotic genes. It can be concluded that zinc oxide nanoparticles, administered at 5 mg/kg, had the most beneficial effect on male reproductive performance, while 10 mg/kg could have a detrimental effect.
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http://dx.doi.org/10.3390/antiox10010041DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7823932PMC
December 2020

Physical endometrial manipulation and its impact on success rate and live birth rate in ICSI in patients with unexplained infertility after recurrent ICSI failure, a double blinded randomized controlled trial.

J Matern Fetal Neonatal Med 2020 Sep 22;33(17):2983-2989. Epub 2019 Jan 22.

Obstetrics and Gynecology Department, AlAzhar University, Cairo, Egypt.

Unexplained infertility is a rising problem and endometrial manipulation could be one of the solutions for enhancing the pregnancy rate and live birth rate in such circumstances. To evaluate the influence of local endometrial physical manipulation with specializd method for endometrial and tubal hydration (Elgazzar and Alalfy technique) on ICSI outcome and in increasing chemical, clinical, and live birth rate in ICSI after previous recurrent ICSI failure in patients with unexplained infertility. When comparing group 1 (hydrotubation group) and group 2 (the control group with no intervention) with regards to the biochemical, clinical, and live birth rate, the hydrotubation group revealed higher rates and a better ICSI outcome. Hydrotubation is useful in increasing biochemical, clinical, and live birth rates after recurrent failed ICSI trials with a specialized method for hydration of endometrium and tubes (Elgazzar and Alalfy technique).
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http://dx.doi.org/10.1080/14767058.2019.1566897DOI Listing
September 2020

Effect of subcutaneous tissue closure technique in cesarean section on postoperative wound complications in obese Egyptian women.

J Matern Fetal Neonatal Med 2019 Aug 20;32(15):2452-2459. Epub 2018 Feb 20.

b Department of Obstetrics and Gynecology , Kasralainy, Cairo University , Cairo , Egypt.

Subcutaneous tissue closure technique is a wide area of interest for obstetricians who perform cesarean section especially on obese women while many observers studied in an extensive manner postoperative pain and wound cosmetic results.

Aim Of The Work: The main goal of our work was to display the differences in wound outcome results as regard postoperative wound complications comparing the two widely implemented techniques in subcutaneous tissue closure (interrupted versus continuous methods).

Results: A comparative analysis between continuous and interrupted techniques regarding wound complications (gapping, seroma, erythema, and infection) showing statistical significant differences in all four wound complications presented with p values = .019, .011, .015, and .001, in consecutive order with odds ratio in wound gapping = 5.239, wound seroma OR = 9.429, wound erythema OR = 3.709, and wound infection OR = 6.136.

Conclusions: Subcutaneous wound closure using interrupted technique of suturing in obese patients is superior to continuous technique as regard wound complications. Clinical trials.gov ID Identifier (NCT03354078).
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http://dx.doi.org/10.1080/14767058.2018.1438399DOI Listing
August 2019