Author’s reply to the letter to the editor of Journal of the Korean Association of Oral and Maxillofacial Surgeons

Atef Abdel Hameed Fouda 대한구강악안면외과학회 2020 대한구강악안면외과학회지 Vol.46 No.5

Does poly(acrylic acid-co-acrylamide) hydrogel be the pluperfect choiceness in treatment of dyeing wastewater? ‘‘From simple copolymer to gigantic aqua-waste remover’’

Atef S. Darwish,Mohamed A. Mekewi,Tarek M. Madkour,Youmna M. Hashish 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-

This work focused on designing three-categorized polymeric forms; carboxylic-enriched, amideenrichedand equi-rationed amide-carboxylic hydrogels. Such hydrogels were analyzed using swelling,Monte-Carlo simulations, TGA, zeta-potential measurements, SEM and AFM. Their adsorption behaviorswere examined using methylene blue dye. Effect of pH, adsorption isotherms, kinetics, temperature andadsorbent reproducibility were deliberated. All adsorption processes described by Dubinin–Radushkevichmodel following pseudo-second order kinetics. Carboxylic-enriched hydrogel showed negativelychargedsmooth surfaces with unusual ulcer-like holes, which played the chief role in dyeing removalfrom wastewater with superior reproducibility. Increasing amide ratios in hydrogels encouragedelectrostatic and chemical interactions with dye molecules and deteriorated adsorbent reproducibility.

CASE REPORT : Hemangiopericytoma of the Cerebellopontine Angle: A Wolf in Sheep`s Clothing

( Atef Ben Nsir ),( Mohamed Badri ),( Alia Zehani Kassar ),( Karim Ben Hammouda ),( Hafedh Jemel ) 대한뇌종양학회 대한신경종양학회 2016 Brain Tumor Research and Treatment Vol.4 No.1

Primary meningeal hemangiopericytoma (HPC) is a rare, aggressive dura based tumor that remarkably mimics a meningioma clinically and radiologically. Its occurrence within the cerebellopontine angle (CPA) is exceptional, and establishing the exact diagnosis is of the utmost importance since total resection remains the cornerstone of treatment. A 42-year-old man presented with a three-month history of progressively worsening vertigo and difficulty in walking. On admission, his neurological examination revealed a right peripheral facial palsy, right abducens palsy and left hemiparesis, suggesting the diagnosis of Millard-Gubler syndrome. Computed tomography and magnetic resonance imaging demonstrated a homogeneously enhancing dura based lesion of the right CPA causing major brain stem compression. There was no widening of the ipsilateral internal auditory canal. A standard retrosigmoid craniotomy was performed to access the right CPA. Exposure of the lesion revealed a well-encapsulated, gray, fibrous lesion, which appeared to originate from the tentorium. Gross total resection was achieved and confirmed radiologically. The microscopic features and the immunohistochemical profile confirmed the diagnosis of a HPC, and adjuvant radiation therapy was administered. Ten years later, the patient presented with a severe neurological deficit due to a local recurrence, but at that time refused any second intervention. He died three months later. HPC can locate within the CPA and present as a Millard-Gubler syndrome. The diagnosis should be kept in mind in case of a CPA dura based tumor. Radical surgery plus radiation therapy can maximize the recurrence-free survival and close follow-up remains mandatory to spot recurrences early.

LA CRISE DE LA TRANSITION DEMOCRATIQUE ET LE « ONE STEP FLOW OF COMMUNICATION » DU PRESIDENT TUNISIEN

Atef KHAYAT 고려대학교 응용문화연구소 2021 에피스테메 Vol.- No.26

Through a content and semiological cross-analysis, this article aims at grasping the utterance of Tunisian president Kais Saied's statements on his official Facebook page. On July 25th, 2021 he has ended a political crisis in the country before another one was portending following the parliament freeze by him. Under the prism of a redundant speech in adequacy with the people's expectations, he starts a unique political model of its kind in the Arab-speaking world, yet more and more frequent in longtime democratic areas: populism. After coming to power through ballots, can he jeopardize a whole democratic process that is still unclear? Dans une analyse croisée sémiologique et de contenu, cet article vise à saisir les articulations des sorties du président tunisien Kais Saied sur la page officiel Facebook. Le 25 juillet 2021 il met fin à une crise politique, mais une autre s’annonce après le gel du parlement. Sous le prisme d’un discours redondant et en adéquation avec les attentes du peuple, il inaugure un modèle politique unique en son genre dans l’espace arabophone. Mais, de plus en plus fréquent dans, des aires démocratiques plus anciennes, celui du populisme. Arrivé par la voie des urnes, peut-il compromettre tout un processus démocratique encore balbutiant?

The Role of a Wiring Model in Switching Cell Transients

Atef Jedidi,Hatem Garrab,Herve Morel,Kamel Besbes 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2

Power converter design requires simulation accuracy. In addition to the requirement of accurate models of power semiconductor devices, this paper highlights the role of considering a very good description of the converter circuit layout for an accurate simulation of its electrical behavior. This paper considers a simple experimental circuit including one switching cell where a MOSFET transistor controls the diode under test. The turn-off transients of the diode are captured, over which the circuit wiring has a major influence. This paper investigates the necessity for accurate modeling of the experimental test circuit wiring and the MOSFET transistor. It shows that a simple wiring inductance as the circuit wiring representation is insufficient. An adequate model and identification of the model parameters are then discussed. Results are validated through experimental and simulation results.

The impact of the alveolar bone sites on early implant failure: a systematic review with meta-analysis

Atef Abdel Hameed Fouda 대한구강악안면외과학회 2020 대한구강악안면외과학회지 Vol.46 No.3

Dental implants are the first option for replacement of missing teeth. Failure usually involves additional cost and procedures. As a result, the physician should limit the risk factors associated with implant failures. Implant site is one of many factors that can influence the success or failure of dental implants. The association between early implant failure (EIF) and implant site has yet to be documented. This review aims to estimate the impact of insertion site on the percentage of EIFs. An electronic and manual search of studies that reported early failure of dental implants based on collection site. A total of 21 studies were included in the review and examined for the association between EIF and alveolar site. Subgroup analysis, including a comparison between implants inserted in four alveolar ridge regions of both jaws was performed. The early failure rate was higher for maxillary implants (3.14%) compared to mandibular implants (1.96%). Applying a random effect, risk ratio (RR), and confidence interval (CI) of 95% revealed higher failure in the maxilla compared to the mandible (RR 1.41; 95% CI [1.19, 1.67]; P<0.0001; I2=58%). The anterior maxilla is more critical for early implant loss than other alveolar bone sites. Implants in the anterior mandible exhibited the best success rate compared of the sites.

Synthesis and Anticonvulsant Evaluation of N-Substituted-Isoindolinedione Derivatives

Atef Abdel-Monem Abdel-Hafez 대한약학회 2004 Archives of Pharmacal Research Vol.27 No.5

A series of N-substituted-1,3-isoindolinedione derivatives (2-16) were synthesized for the purpose of defining the effect of N-substitution on the anticonvulsant activity of these derivatives. The target compounds (2-16) were obtained by condensation of phthalic anhydride with the corresponding amine derivative. The structures of the synthesized derivatives (2-16) were confirmed by means of IR, 1H-NMR, 13C-NMR, MS and elemental analyses. The anticonvulsant activity of all compounds (2-16) were evaluated by subcutaneous pentylenetetrazole seizure threshold test at doses of 0.2, 0.4 and 0.8 mmol/kg compared with sodium valproate as a positive control.Their neurotoxicity were determined by the rotorod test. Many of the present series of compounds showed good anticonvulsant activity at the tested doses, as compared to sodium valproate. Three of them (4, 6 and 11) exhibited 100 % protection against convulsions, neurotoxicity and death at all tested doses. Out of the series, two compounds (12 and 13) were completely inactive with 100% mortality. 3-(p-chlorophenyl)-4-(1,3-dioxo-2,3-dihydro-1H- 2-isoindolyl)butanoic acid derivative (11) has emerged as the most active compound which is 20 times more active than valproate with ED50 8.7, 169 mg/kg; TD50 413, 406 mg/kg and PI 47.5, 2.4. The results revealed the importance of the combination of baclofenic and phthalimide moieties (compound 11) as a promising anticonvulsant candidate.

Benzimidazole Condensed Ring Systems: New Synthesis and Antineoplastic Activity of Substituted 3,4-Dihydro- and 1,2,3,4-Tetrahydro-benzo[4,5]imidazo[1,2-a]pyrimidine Derivatives

Atef Abdel-monem Abdel-hafez 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.6

As part of an ongoing effort to develop new antineoplastic agents, a series of substituted 3,4- dihydro- and 1,2,3,4-tetrahydro-benzo[4,5]imidazo[1,2-a]pyrimidine derivatives (5-19) were synthesized. 1,2,3,4-Tetrahydrobenzo[4,5]imidazo[1,2-a]pyrimidine-2-one derivatives (5-7) were prepared via one-pot two-component thermal cyclization reaction of 2-aminobenzimidazole 1 and P-substituted methyl cinnamates (2-4). Vilsmir-Haack formylation of these derivatives (5-7) afforded the 2-chloro-3-carboxaldehyde targets (8-10) followed by nucleophilic displacement of the chloro atom in the 3-carboxaldehyde compounds (8-10) to yield the remaining final targets (11-19). The structures of the synthesized derivatives (5-19) were confirmed by means of IR, 1H NMR, MS and elemental analyses. The synthesized derivatives (5-19) were subjected to the National Cancer Institute (NCI) in vitro disease human cell screening panel assay. 2- Chloro-4-phenyl-3,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrimidine-3-carboxyaldehyde (8, NCI 722731) and 4-(4-methoxyphenyl)-2-(4-methylpiperazin-1-yl)-3,4-dihydrobenzo[4,5]imidazo [1,2-a]pyrimidine-3-carboxaldehyde (18, NCI 722739) showed a variable degree of antineoplastic activity against some of the cell lines tested. 2-Chloro-4-(4-nitrophenyl)-3,4-dihydrobenzo[ 4,5]imidazo[1,2-a]pyrimidine-3-carboxyaldehyde (10, NCI 722743) exhibited good in vitro antineoplastic activity with subpanel disease selectivity against all the cell lines tested with log10 GI50 (M), the concentration that inhibits 50% of cell growth, values ranging from –5.08 to < -8.00.

Effectiveness of A Proposed Program for Training Social Studies Teachers in the Light of Electronic Functional Competencies

Atef Mohamed Saied, Abdallah International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.12

The study aimed to build a proposed program for training Social Studies teachers in the light of electronic functional competencies, the researcher used the experimental method with a quasi-experimental design, the study sample consisted of (37) Social studies teachers in Ismailia. A proposed program in the light of electronic functional competencies. A measure of awareness of the dimensions and components of electronic feasibility. The study concluded several results: There is a statistically significant difference at the level of (a ≤0.01) between the average scores of the teachers of the research group in the pre and post measurements of the measure of awareness of the dimensions and components of electronic functional competencies in favor of the teachers scores in the post-measurement. Training Social studies teachers on the functional electronic competencies necessary for them to keep up with educational developments.

New Record of Three Marine Ciliates (Protozoa, Ciliophora) from South Korea

Atef Omar,문지혜,정재호 한국동물분류학회 2023 Animal Systematics, Evolution and Diversity Vol.39 No.1

During a field survey of Korean marine ciliates, we collected three ciliate species from the eastern coastal waters of the Yellow Sea. Based on the observation of living and protargol and wet silver nitrate stained cells, the ciliates, belonging to the classes Spirotrichea and Oligohymenophorea, were identified as Cardiostomatella vermiformis (Kahl, 1928) Corliss, 1960, Parallelostrombidium paraellipticum Song et al., 2018, and Pleuronema paucisaetosum Pan et al., 2015. Both Parallelostrombidium paraellipticum and Pleuronema paucisaetosum were described only from their type localities, i.e., brackish water, suggesting that they tolerate a broad range of salinity, while Cardiostomatella is marine ciliate and seems to be cosmopolitan. These three species were reported for the first time in Korea. Brief descriptions, remarks to justify their identity and to compare the present isolates with similar taxa, and photomicrographs were provided for the three species.