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Phytochemical Study of Lotus ornithopodioloides L.
Maged S. Abdel-Kader,Omer A. Basudan,Saleh I. Alqasoumi,Mohamed I. Abou-Shoer 한국생약학회 2007 Natural Product Sciences Vol.13 No.4
investigation of the aerial parts of L. resulted in the isolationof six known compounds. The structures were determined utilizing physical, chemical, spectral methods as wellas direct comparison with reference materials whenever possible. The compounds were identified as: β-sitosterol;the two triterpenes oleanolic and betulinic acids; the two cyanogenic glycosides lotaustralin and linamarin inaddition to the flavonol diglycoside kaempferitin.KeywordsLotus ornithopodioloides (Fabaceae), β-sitosterol, triterpene acids, cyanogenic glycosides, kaemferitin
Rare 2-Phenoxychromones from Ononis serrata Growing in Egypt
Maged S. Abdel-Kader,Fahima F. Kassem,Masouda E. Amer 한국생약학회 2004 Natural Product Sciences Vol.10 No.1
Two 2-phenoxychromones; a rare group of natural products, were isolated from the combined ethyl acetate and chloroform fractions of the ethanolic extract of Ononis serrata frossk (Leguminosae) growing in Egypt. Structures were elucidated by chemical, spectroscopic methods as well as single X-ray diffraction analyses. The cytotoxic and antimicrobial effects of the two compounds were examined. It is worth to mention that this is the first report on the isolation of 2-phenoxychromones from the family Leguminosae.
Bioactivity Guided Phytochemical Study of Clematis hirsuta Growing in Saudi Arabia
Abdel-Kader, Maged S.,Al-Taweel, Areej M.,El-Deeb, Kadriya S. The Korean Society of Pharmacognosy 2008 Natural Product Sciences Vol.14 No.1
Bioactivity guided phytochemical study of the petroleum ether and butanol extracts of Clematis hirsuta resulted in the isolation of 12 compounds. Rat paw edema as a model of acute inflammation was used to evaluate the anti-inflammatory activity of the extracts and the chromatographic fractions. Five known sterols and triterpenes namely: ${\beta}-amyrin$ (1), lupeol (2), ${\beta}-sitosterol$ (3), oleanolic acid (4) and stigmasterol glycoside (5) were isolated from the petroleum ether extract. The n-butanol extract afforded two compounds reported for the first time from natural source: (S)-(+)-dihydro-5-(hydroxymethyl)-2(3H)-furanone (7) and (s)-(-)-5-hydroxymethyl-2(5H)-furanone (8). In addition, anemonin (6), dihydro-4-hydroxy-5-(hydroxymethyl)-2(3H)-furanone (2-deoxy-D-ribono-1,4-lactone) (9), biophenol (cimidahurin) (10), glucose (11) and sucrose (12) were also identified. The structures were determined from spectroscopic data including 1D- and 2D-NMR experiments.
Single-use endoscopes: A narrative review
Maged Tharwat Elghannam,Moataz Hassan Hassanien,Yosry Abdelrahman Ameen,Gamal Mohammed Elattar,Ahmed Ali El Ray,Emad Abdel Wahab Turky,Mohammed Darwish El Talkawy 소화기인터벤션의학회 2022 International journal of gastrointestinal interven Vol.11 No.1
The transmission of infections through gastrointestinal endoscopy is a vital issue. The main problem lies in the use of duodenoscopes due to mechanical aspects of the scope design. Even with high-level disinfection, sterilization of the scope can fail. Hence, the Food and Drug Administration has encouraged a shift to single-use endoscopes. Available options include endoscopes with single-use components (mainly single-use endcaps), fully single-use duodenoscopes (SUDs), and even those with a disposable elevator mechanism. Clinical trials revealed that both reusable and single-use scopes have the same efficacy, while single-use scopes have benefits in terms of infection control, economic considerations, and ease of reprocessing. A few drawbacks are left to be dealt with. Reusable duodenoscopes with removable/disposable endcaps are satisfactory except in specific situations where SUDs are better to use.
Single-use endoscopes: A narrative review
Maged Tharwat Elghannam,Moataz Hassan Hassanien,Yosry Abdelrahman Ameen,Gamal Mohammed Elattar,Ahmed Ali El Ray,Emad Abdel Wahab Turky,Mohammed Darwish El Talkawy 소화기인터벤션의학회 2022 Gastrointestinal Intervention Vol.11 No.1
The transmission of infections through gastrointestinal endoscopy is a vital issue. The main problem lies in the use of duodenoscopes due to mechanical aspects of the scope design. Even with high-level disinfection, sterilization of the scope can fail. Hence, the Food and Drug Administration has encouraged a shift to single-use endoscopes. Available options include endoscopes with single-use components (mainly single-use endcaps), fully single-use duodenoscopes (SUDs), and even those with a disposable elevator mechanism. Clinical trials revealed that both reusable and single-use scopes have the same efficacy, while single-use scopes have benefits in terms of infection control, economic considerations, and ease of reprocessing. A few drawbacks are left to be dealt with. Reusable duodenoscopes with removable/disposable endcaps are satisfactory except in specific situations where SUDs are better to use.
Amina Abdel Meguid Attia,Maged Shafik Antonious,Mona Abdel Hamid Shouman,Ahmed Ali Ahmed Nada,Khadiga Mohamed Abas 한국탄소학회 2019 Carbon Letters Vol.29 No.2
Lignocellulosic materials such as agricultural residues have been identified as potential sustainable sources that can replace petroleum-based polymers. This study focused on the conversion of lignin extracted from bagasse to carbon fiber (CF) and cellulose nanocrystal (CNC). The highest extraction of lignin yield was achieved at 100 °C using 10% NaOH for 12 h. Carbon fibers were obtained by electro-spinning of bagasse lignin blended with polyvinyl alcohol (PVA) (11 wt/v %) followed by thermo-stabilization (250 °C) in an oxidizing atmosphere and further carbonization in an inert atmosphere (850 °C). Conventional hydrolysis process was used to extract cellulose nanocrystal from bagasse pulp. Morphological (scanning electron microscopy, SEM), spectral (Fourier transform infrared, FTIR) spectroscopy, elemental analysis, thermal characterization and surface area measurements have been carried out. Figures originated by SEM showed that CF ranges from 145 to 204 nm, while stabilized bagasse cellulose nanocrystal (SCNC) appeared as rod-shape like structure in the range of length 600–800 nm and diameter 5.33–19 μm. Characterization results revealed that CF exhibits microporous structure, while bagasse lignin and SCNC display mesoporous structure. In addition, the results proved that SCNC exhibits a percentage removal 71.56% for methylene blue dye in an aqueous solution.
Alaa El din-Abdel Aal Moubasher,Emad Abdelrehim Taha,Ehab Mohamed Elnashar,Ahmed Abdel Aal Abdel Maged,Asmaa Mohamed Zahran,Heba Hassan Sayed,Hisham Diab Gaber 대한생식의학회 2021 Clinical and Experimental Reproductive Medicine Vol.48 No.1
Objective: This study was conducted to investigate the relationship of semen parameters in samples used for intracytoplasmic sperm injection (ICSI) with fertilization and pregnancy rates in infertile couples.Methods: In this prospective study of Infertile couples with male factor infertility that had undergone ICSI, fractions of the same semen samples obtained for microinjection (to ensure the best predictability) were evaluated to determine the semen parameters and sperm DNA fragmentation index (DFI) on the day of oocyte recovery.Results: In total, 120 couples completed the study and were subdivided into fertilized (n=87) and non-fertilized couples (n=33). The fertilized couples were further classified into pregnant (n=48) and non-pregnant (n=39) couples. Compared to non-fertilized and non-pregnant couples, fertilized and pregnant couples showed statistically significantly higher sperm viability and percentage of normal sperm morphology, as well as significantly lower sperm DFI values. A receiver operating characteristic curve analysis of data from the 120 ICSI cycles showed that sperm viability, normal sperm morphology percentages, and sperm DFI were significant prognostic indicators of fertilization at cutoff values of 40%, 7%, and 46%, respectively. A sperm DFI of 46% showed sensitivity and specificity of 95% and 90%, respectively, for predicting fertilization, and no clinical pregnancies occurred in couples with a sperm DFI above 46%.Conclusion: Semen parameters from the ICSI day sample, especially sperm viability, normal morphology, and DFI, had an impact on fertilization and pregnancy outcomes in ICSI cycles.
Technological and economic study of ship recycling in Egypt
Yousri M. A. Welaya,Maged M. Abdel Naby,Mina Y. Tadros 대한조선학회 2012 International Journal of Naval Architecture and Oc Vol.4 No.4
The ship recycling industry is growing rapidly. It is estimated that the International Maritime Organiz¬ation’s (IMO) decision to phase-out single hull tankers by 2015 will result in hundreds of ships requiring disposal. At present, the ship recycling industry is predominantly based in South Asia. Due to the bad practice of current scrapping procedure, the paper will highlight the harm occurring to health, safety and environment. The efforts of the Marine Environment Protection Committee (MEPC) which led to the signing of the Hong Kong International Convention are also reviewed. The criteria and standards required to reduce the risk and damage to the environment are discussed and a proposed plan for the safe scrapping of ships is then presented. A technological and economic study for the ship recycling in Egypt is carried out as a case study. This includes the ship recycling facility size and layout. The equipment and staff required to operate the facility are also evaluated. A cost analysis is then carried out. This includes site development, human resources, machineries and equipment. A fuzzy logic approach is used to assess the benefits of the ship breaking yard. The use of the fuzzy logic approach is found suitable to make decisions for the ship breaking in¬dustry. Based on given constraints, the proposed model has proved capable of assessing the profit and the internal rate of return.