Ahmed Bayoumy Zaki

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BACKGROUND Stents were used routinely after ureteroscopy to prevent postoperative ureteral obstruction. However, because of the recognized complications of stents, non-stenting is the new trend after uncomplicated ureteroscopy. The wall of the bilharzial ureter is characteristically thick and may be calcified. The aim of this study is to see if the(More)
BACKGROUND Non-invasive intraductal papillary mucinous neoplasm (IPMN) with high-grade dysplasia and IPMN-associated invasive pancreatic ductal adenocarcinoma (PDAC) are frequently included under the term "malignancy". The goal of this study is to clarify the difference between these two entities. METHODS From 1996 to 2013, data of 616 patients who(More)
The Tokyo Virtual Living Lab is an experimental space based on 3D Internet technology that lets researchers conduct controlled driving and travel studies, including those involving multiple users in the same shared space. This shared-use feature is crucial for analyzing interactive driving behaviors in future smart cities. The lab's novelty is two-fold: it(More)
AIM The aim of this retrospective analysis was to assess the clinical effectiveness of exenatide in patients with type 2 diabetes in routine clinical practice. METHODS Patients with type 2 diabetes mellitus and inadequate glycemic control were commenced on exenatide in an out-patient setting. Effects on Hba1c, weight and BMI at 3- and 6-month intervals(More)
Background: Day case cholecystectomy is increasingly becoming a management option for elective cases while “same admission” cholecystectomy is now considered a favorable option in the treatment of acute cholecystitis. To assess the advent of these changes in our surgical practice, a retrospective analysis of our experience is presented. Methods: All(More)
BACKGROUND AND STUDY AIMS Laparoscopic appendicectomy had been well established by Semm before the popular breakthrough of laparoscopic cholecystectomy. The aim of this study was to evaluate the role of laparoscopy in the diagnosis and treatment of acute appendicitis. PATIENTS AND METHODS This is a retrospective study. Patients with signs and symptoms of(More)
BACKGROUND Long-term follow-up has substantiated the colon as a durable and highly acceptable esophageal substitute. Exposure of colonic conduit to gastric acid may lead to histopathologic changes in the form of chronic inflammation. MATERIALS/METHODS Thirty children with esophageal replacement were studied from 2 to 12 years (mean, 5.20 years)(More)
The adsorption and the kinetics of the intercalation of metanil yellow dye, p-aminodiphenylamine (p-NH(2)-DPA), and benzidine by colloidally dispersed Na(+)-montmorillonte (Na(+)-MMT) have been studied. The adsorption isotherm parameters confirmed the occurrence of chemical adsorption that is based on the cation-exchange process. The selectivity of these(More)
This paper is devoted to the preparation of polyaniline/MnO2 (PANI/MnO2) composites via chemical oxidation of aniline in H2SO4 medium using beta-MnO2 as an oxidant. The parameters affecting the polymerization reaction are considered. These parameters are [aniline], amount of beta-MnO2, stirring time, and polymerization temperature. SEM, FT-IR, XRD, and TGA(More)