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Zschock, M., A. A. A. El Sayed, and H. P. Hamann, Occurrence of verotoxin-forming Escherichia coli in cows suffering from mastitis., , vol. 53, issue 6: AVA AGRARVERLAG PROSCHESTR 2, 87437 KEMPTEN, GERMANY, pp. 307 - 309, 1998. Abstract
Zohier, A. S., T. A. Baraka, A. I. Abdelgalil, A. M. Aboelmaaty, and S. G. Yehia, "Oxidative stress biomarkers status in selected equine sports", Comparative Clinical Pathology, vol. 32, issue 3, pp. 461-466, 2023.
ZK, H., H. MM, M. TM, and Z. AR., "Occult HBV Infection Among Egyptian Hepatocellular Carcinoma Patients", Virology Journal, vol. 8:90, 2011. AbstractCU-PDF.pdf

Background: Occult HBV infection accelerates the progression of liver fibrosis, cirrhosis, and finally leading to hepatocellular carcinoma (HCC). This study analyzed the occult HBV-genotypes in HCC patients.

Zidan, M. N., N. Everitt, T. Ismail, and I. S. Fahim, "Organic Solar Cells Parameters Extraction and Characterization Techniques", Polymers, vol. 13, no. 19: Multidisciplinary Digital Publishing Institute, pp. 3224, 2021. Abstract
Ziada, A., A. Hamza, M. Abdel-Rassoul, E. Habib, A. Mohamed, and M. Daw, "Outcomes of hypospadias repair in older children: a prospective study", The Journal of urology, vol. 185, issue 6: Elsevier, pp. 2483-2486, 2011. Abstract
Zhou, L. -li, W. Liu, Y. -min Wu, W. -lian Sun, C. E. Dörfer, and K. M. F. El-Sayed, "Oral mesenchymal stem/progenitor cells: the immunomodulatory masters", Stem cells international, vol. 2020: Hindawi, 2020. Abstract
Zhang, T., H. Li, T. Yan, S. M. Shaheen, Y. Niu, S. Xie, Y. Zhang, H. Abdelrahman, E. F. Ali, N. S. Bolan, et al., "Organic matter stabilization and phosphorus activation during vegetable waste composting: Multivariate and multiscale investigation", Science of The Total Environment, vol. 891, pp. 164608, 2023. AbstractWebsite

The conversion of organic matter and P in the waste composting process affects the efficiency of the composted product. However, the addition of microbial inoculants may improve the conversion characteristics of organic matter and P. In this study, straw-decomposing microbial inoculant (SDMI) was added to investigate its effects on the organic matter stabilization and phosphorus activation during the composting of vegetable waste (VWs). Aliphatic carboxyl-containing compounds were degraded during composting, but the stability of the organic matter and P was improved. The addition of SDMI promoted the degradation of dissolved organic carbon by 81.7 % and improved P stability and thermal stability of organic matter. Hedley sequential P fractionation showed a decrease in the H2O-P proportion by >12 % and increased in the HCl-P proportion by >4 % by the end of composting. Stable forms of P, such as AlPO4 and iron-containing phosphate, were the main forms of P in the final compost. The results provide a basis for producing high-quality vegetable compost products and improving the reutilization potential of VWs.

Zenhom, Z. M., and T. A. Boghdady, "Optimal Allocation of Distributed Generation in A Part of The Egyptian Electrical Network Using Whale Optimization Algorithm", 2019 21st International Middle East Power Systems Conference (MEPCON), 2019.
Zellagui, M., S. Settoul, A. Lasmari, C. Z. El-Bayeh, R. Chenni, and H. A. Hassan, "Optimal Allocation of Renewable Energy Source Integrated-Smart Distribution Systems Based on Technical-Economic Analysis Considering Load Demand and DG Uncertainties", Artificial Intelligence and Renewables Towards an Energy Transition, Part of the "Lecture Notes in Networks and Systems book series (LNNS, volume 174)", New York, Springer, Cham (vol. 174, pp. 391-404), 2021. bookmatter_artificialintelligenceandrenew.pdf
Zellagui, M., and H. A. Hassan, "Optimal Placement and Sizing of PVDGs in Radial Distribution System Using Hybrid PSO-GSA", Journal of Advanced Research in Science and Technology (JARST), vol. 5, issue 1, pp. 627-639, 2018. 127-385-2-pb.pdf
Zekri, W., M. Hammad, W. M. Rashed, G. Ahmed, M. Elshafie, M. H. Adly, Y. Elborai, B. Abdalla, H. Taha, N. Elkinaae, et al., "The outcome of childhood adrenocortical carcinoma in Egypt: A model from developing countries", Pediatric Hematology and Oncology, vol. 37, issue 3, pp. 198 - 210, 2020/04//. AbstractWebsite

Adrenocortical carcinoma (ACC) is a rare, aggressive endocrine neoplasm. Complete surgical resection is the single most important treatment. Most available information has been learned from experience with its more frequent adult counterpart. In this study, we assessed the features and survival outcome of patients with ACC at Children's Cancer Hospital Egypt (CCHE). Patients diagnosed at CCHE between July 2007 and November 2016 were followed up on until November 2018. Patients with stages I and II were operated upon, while stages III and IV had received combinations of doxorubicin, etoposide, platinol, and mitotane (DEPM) beside the attempt to conduct surgery when feasible. Data belonging to 18 patients (7 men and 11 women) were analyzed; median age at diagnosis was 48.5 months. Sixteen patients had presented with secreting tumors. Six patients were diagnosed with stage I disease; four with stage II; three with stage III; and five with stage IV carcinoma. By the end of this study, 10 patients have survived; five-year overall survival of 66.3%. Surviving patients were all of stage I or II diseases and were all in remission. Seven patients who did not survive died due to tumor progression, while one patient died after chemotherapy. The prognosis of ACC is essentially dependent on a successful complete resection of the tumor and thus on the initial tumor stage. The mitotane and DEP protocols may help control tumor growth in the advanced stages for only short periods. Key pointsInitial stage and resectability are the main indicators of outcomes in adrenocortical carcinoma.Chemotherapeutic agents used in developed countries did not achieve the same outcomes.Further molecular-pharmacology differentiation is needed for various ethnic populations.

Zekri, W., M. Hammad, Y. ElBoraie, and A. Younes, "The outcome of childhood adrenocortical carcinoma in Egypt: A model from developing countries", Pediatric Hematology and Oncology, 2020.
Zeitoun, R., A. M. Shokry, S. Ahmed Khaleel, and S. M. Mogahed, "Osteosarcoma subtypes: Magnetic resonance and quantitative diffusion weighted imaging criteria.", Journal of the Egyptian National Cancer Institute, 2018 Feb 08. Abstract

INTRODUCTION: Osteosarcoma (OS) is a primary bone malignancy, characterized by spindle cells producing osteoid. The objective of this study is to describe the magnetic resonance imaging (MRI) features of different OS subtypes, record their attenuation diffusion coefficient (ADC) values and to point to the relation of their pathologic base and their corresponding ADC value.

PATIENTS AND METHODS: We performed a retrospective observational lesion-based analysis for 31 pathologically proven osteosarcoma subtypes: osteoblastic (n = 9), fibroblastic (n = 8), chondroblastic (n = 6), para-osteal (n = 3), periosteal (n = 1), telangiectatic (n = 2), small cell (n = 1) and extra-skeletal (n = 1). On conventional images we recorded: bone of origin, epicenter, intra-articular extension, and invasion of articulating bones, skip lesions, distant metastases, pathological fractures, ossified matrix, hemorrhage and necrosis. We measured the mean ADC value for each lesion.

RESULTS: Among the included OS lesions, 51.6% originated at the femur, 29% showed intra-articular extension, 16% invaded neighboring bone, 9% were associated with pathological fracture and 25.8% were associated with distant metastases. On MRI, all lesions showed ossified matrix, 35.5% showed hemorrhage and 58% showed necrosis. The mean ADC values for OS lesions ranged from 0.74 × 10 mm/s (recorded for conventional osteoblastic OS) to 1.50 × 10 mm/s (recorded for telangiectatic OS) with an average value of 1.16 ± 0.18 × 10 mm/s. Conventional chondroblastic OS recorded higher values compared to the other two conventional subtypes.

CONCLUSION: Osteosarcoma has different pathologic subtypes which correspondingly vary in their imaging criteria and their ADC values.

Zeineldin, H., E. Elsaadany, M. Salama, A. Kasem, and W. Woon, "Optimal Sizing of Thyristor Controlled Impedance for Smart Grids with Multiple Configurations", IEEE Transactions on Smart grids, pp. 528-537, 2011.
Zeineldin, H. H., H. M. Sharaf, D. K. Ibrahim, and E. E. L. - D. A. EL-Zahab, "Optimal Protection Coordination for Meshed Distribution Systems With DG Using Dual Setting Directional Over-Current Relays", IEEE TRANSACTIONS ON SMART GRID, vol. 6, issue 1, pp. 115-125, 2015.
Zeineldin, H. H., H. M. Sharaf, D. K. Ibrahim, and E. E. - D. AbouEl-Zahab, "Optimal Protection Coordination for Meshed Distribution Systems With DG Using Dual Setting Directional Over-Current Relays", IEEE Transactions on Smart Grid, vol. 6, no. 1: IEEE, pp. 115–123, 2015. AbstractWebsite

In the presence of distributed generation (DG), it is important to assure a fast and reliable protection system for the distribution network to avoid unintentional DG disconnection during fault conditions. In this paper, dual setting directional over-current relays are proposed for protecting meshed distribution systems with DG. Dual setting relays are equipped with two inverse time-current characteristics whose settings will depend on the fault direction. The protection coordination problem for the dual setting directional relay is formulated as a nonlinear programming problem where the objective is to minimize the overall
time of operation of relays during primary and backup operation.
The proposed protection coordination scheme using dual setting relays is compared against the conventional approach, which relies on the conventional one setting directional relay. The proposed scheme is applied to the power distribution network of the IEEE 30-bus system equipped with synchronous and inverter-based DG. The results show that the proposed protection coordination scheme with dual setting relay can significantly reduce the overall relay operating time, making it an attractive option for distribution systems with DG.

Zeineldin, H. H., H. M. Sharaf, D. K. Ibrahim, and E. E. - D. AbouEl-Zahab, "Optimal Protection Coordination for Meshed Distribution Systems With DG Using Dual Setting Directional Over-Current Relays", IEEE Transactions on Smart Grid, vol. 6, issue 1: IEEE, pp. 115 - 123, 2015. Abstract


Zeineldin, H. H., H. Sharaf, D. Ibrahim, and A. E. El-Zahab, "Optimal Protection Coordination for Meshed Distribution Systems With DG Using Dual Setting Directional Over-Current Relays", IEEE Transactions on Smart Grid, vol. 6, issue 1, pp. 115-123, 2015.
Zeid, N. G., A. S. Mohamed, M. E. S. ElFouly, K. O. Azooz, M. M. Aleryan, and M. A. E. Sabaa, "Objective Comparison Between Spreader Grafts and Flaps for Mid-Nasal Vault Reconstruction: A Randomized Controlled Trial", Plastic Surgery, vol. 28, issue 3, pp. 137-141, 2020.
Zeeneldin, A. A., M. A. Saber, A. H. Hassouna, and S. A. Farag., "o Esophageal Carcinoma in El-Gharbia Governorate, Egypt: Clinico-Epidemiologic Study and Treatment Outcome. ", International Journal of Clinical Oncology and Cancer Research , vol. 2, issue 1, pp. 15-21, 2017.
Zedan, H., Overview of Egypt’s Biodiversity Status and Trends. Report for EEAA, Egyptian Ministry of the Environment, , Cairo, EEAA, Egyptian Ministry of the Environment, Egypt, pp. 259, August, 2014.
Zedan, R., C. S. Farag, J. Gouda, A. Awadein, H. Elhilali, and D. H. Hassanein, "Outcome of intraocular lens exchange for the management of myopic shift in pseudophakic children.", European journal of ophthalmology, pp. 11206721231218299, 2023. Abstract

PURPOSE: To evaluate the visual outcome of intraocular lens (IOL) exchange for the management of myopic shift in pseudophakic children.

METHODS: The medical records of children who underwent IOL exchange for myopic shift were examined. The preoperative data, operative details and the postoperative outcome were analyzed.

RESULTS: Twenty-one eyes (16 patients) were identified. Mean age at cataract extraction was 20 ± 26 months (range, 2-84 months). Twelve patients (6 unilateral, 6 bilateral) had primary IOL implantation. Mean age at IOL exchange was 7.3 ± 3.2 years. Mean spherical equivalent (SE) at IOL exchange was -14 ± 5 D (range, -7 to -21 D): Mean SE at IOL exchange was -13.64± 4.99 D, -12 ± 1.53 D, and -15.5 ± 4.7 D in unilaterally pseudophakic cases (8 patients), in the eye that underwent unilateral IOL exchange (3 patients) in bilaterally pseudophakic cases, and in bilateral IOL exchange cases (5 patients), respectively. Mean axial length at IOL exchange was 24 ± 1.3 mm (range, 23 to 27 mm). Following IOL exchange, mean SE was reduced to -2 ± 1.8 D (range, -4 to +2.5 D). An average of three logMAR line improvement in the best-corrected visual acuity was observed in 12/16 eyes of patients for whom pre- and post-exchange visual acuity were available, while visual acuity remained unchanged in 4 eyes. Mean logMAR visual acuity improvement was 0.35 and 0.49 in unilateral and bilateral pseudophakic cases, respectively.

CONCLUSIONS: IOL exchange is a safe procedure that should be considered to improve visual rehabilitation in pseudophakic patients with myopic shift.

Zayed, A.I., E. - S. A. M. A. M. H., "On Lagrange interpolations and Kramer's sampling theorem associated with self-adjoint boundary value problems", Journal of Mathematical Analysis and Applications, vol. 158, no. 1, pp. 269-284, 1991. AbstractWebsite
Zayed, E. M. E., S. R. Grace, H. El-Metwally, and M. A. El-Moneam, "The oscillatory behavior of second order nonlinear functional differential equations", Arabian Journal for Science and Engineering, vol. 31, issue 1: Citeseer, pp. 23-30, 2006. Abstract