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    Combined arthroscopic management of concurrent posterior and anterior ankle pathologies

    Abdelatif, Nasef Mohamed Nasef
    Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, November 2014, Vol.22(11), pp.2837-42 [Peer Reviewed Journal]
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    Title: Combined arthroscopic management of concurrent posterior and anterior ankle pathologies
    Author: Abdelatif, Nasef Mohamed Nasef
    Subject: Arthroscopy ; Ankle Joint -- Surgery ; Joint Diseases -- Surgery
    Description: To determine the technical feasibility and preliminary clinical efficacy of performing simultaneous arthroscopic management in cases with combined posterior and anterior ankle pathologies utilizing previously described standard arthroscopic procedures within a single surgical sitting. Nineteen consecutive patients with combined anterior and posterior ankle pathologies were included in the current study, after at least 6 months of failed conservative managements. Combined standard posterior and anterior ankle arthroscopy was performed in all patients within the same surgical session; first with the patient in the prone position, then with the patient turned onto the supine position to perform the anterior procedure. All patients were available for the follow-up; the median follow-up period was 33 months (range 22-61 months). No persistent neurological deficits or infections were recorded. The American Orthopedic Foot and Ankle Society Ankle and Hind foot Scale score significantly improved from 70.2 ± 15.2 points preoperatively to reach 93.0 ± 5.4 points at 1 year post-operatively (p < 0.001). Sixteen patients (84.2 %) returned to their previous activity levels. Combined arthroscopic management of concurrent posterior and anterior ankle pathologies within the same surgical session is initially clinically encouraging; it allows for an earlier return to activities of daily living without a significantly added morbidity. Case series, Level IV.
    Is part of: Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, November 2014, Vol.22(11), pp.2837-42
    Identifier: 1433-7347 (E-ISSN); 24718735 Version (PMID); 10.1007/s00167-014-2980-y (DOI)

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    Modification of polyethylene-polypropylene fibers by emulsion and solvent radiation grafting systems for boron removal

    Ting, Teo, Nasef, Mohamed
    Fibers and Polymers, 2017, Vol.18(6), pp.1048-1055
    Springer Science & Business Media B.V.
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    Title: Modification of polyethylene-polypropylene fibers by emulsion and solvent radiation grafting systems for boron removal
    Author: Ting, Teo; Nasef, Mohamed
    Subject: Boron ; Chelating adsorbent ; Radiation induced emulsion grafting
    Description: Preparation of boron-selective adsorbent was carried out by radiation induced grafting of glycidyl methacrylate (GMA) onto polyethylene-coated polypropylene (PE-PP) nonwoven fabric in emulsion or solvent medium followed by immobilization of N-methyl-D-glucamine (NMDG). Adsorbent precursors with 180 % degree of grafting (DG) were obtained by applying reaction parameters comprising 20 kGy dose, 5 % monomer concentration and 1 h reaction time in emulsion compared to 30 kGy, 10 % and 3 h in solvent medium. A glucamine density of 2.2 mmol/g could be imparted to the obtained adsorbents. The emulsion-mediated grafting was found more efficient and economical for preparation of boron chelating adsorbents.
    Is part of: Fibers and Polymers, 2017, Vol.18(6), pp.1048-1055
    Identifier: 1229-9197 (ISSN); 1875-0052 (E-ISSN); 10.1007/s12221-017-6840-5 (DOI)

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    Kinetic behaviour of graft copolymerisation of nitrogenous heterocyclic monomer onto EB-irradiated ETFE films

    Sithambaranathan, Paveswari, Nasef, Mohamed, Ahmad, Arshad
    Journal of Radioanalytical and Nuclear Chemistry, 2015, Vol.304(3), pp.1225-1234 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Kinetic behaviour of graft copolymerisation of nitrogenous heterocyclic monomer onto EB-irradiated ETFE films
    Author: Sithambaranathan, Paveswari; Nasef, Mohamed; Ahmad, Arshad
    Subject: Kinetic investigation ; Radiation induced graft copolymerisation ; 4-Vinyl pyridine ; ETFE film
    Description: Kinetic behaviour of graft copolymerisation of a nitrogenous heterocyclic monomer, 4-vinylpyridine (4-VP), onto electron beam irradiated poly(ethylene-co-tetrafluoroethylene) (ETFE) films was investigated in correlation with reaction parameters (absorbed dose, monomer concentration and reaction temperature). This was established by determination of initial polymerisation rate ( r p0 ), characteristic radical recombination rate (γ) and delay time ( t 0 ). The orders of the dependence of the initial rate of grafting on the absorbed dose and monomer concentration were found to be 2.28 and 3.49, respectively. The effect of temperature was investigated in the range of 50–70 °C and the activation energy was determined. The incorporation of poly(4-VP) grafts and the accompanied chemical changes in the grafted ETFE films were monitored using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, respectively. The results of the present study showed that a quantitative kinetic description for grafting of 4-VP onto ETFE can be established and the degree of grafting can be tuned by controlling the reaction parameters.
    Is part of: Journal of Radioanalytical and Nuclear Chemistry, 2015, Vol.304(3), pp.1225-1234
    Identifier: 0236-5731 (ISSN); 1588-2780 (E-ISSN); 10.1007/s10967-015-3927-6 (DOI)

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    Kinetic investigations of emulsion- and solvent-mediated radiation induced graft copolymerization of glycidyl methacrylate onto nylon-6 fibres

    Ting, Teo, Nasef, Mohamed, Sithambaranathan, Paveswari
    Journal of Radioanalytical and Nuclear Chemistry, 2017, Vol.311(1), pp.843-857 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Kinetic investigations of emulsion- and solvent-mediated radiation induced graft copolymerization of glycidyl methacrylate onto nylon-6 fibres
    Author: Ting, Teo; Nasef, Mohamed; Sithambaranathan, Paveswari
    Subject: High energy radiation ; Grafting in emulsion ; Grafting in solvents ; Glycidyl methacrylate ; Nylon-6 fibres
    Description: Kinetic behaviour of graft copolymerisation of glycidyl methacrylate onto nylon-6 fibres in solvent- and emulsion- media was investigated. The order for the dependence of the initial rate of grafting on the monomer concentration for solvent and emulsion grafting systems were found to be 1.65 and 1.57, respectively. The order of dependence of the initial rate of grafting on the absorbed dose was found to be 1.55 for solvent and 0.62 emulsion grafting systems. The results showed that grafting in both systems is controlled by diffusion mechanism and the degree of grafting can be effectively tuned by variation of the grafting parameters.
    Is part of: Journal of Radioanalytical and Nuclear Chemistry, 2017, Vol.311(1), pp.843-857
    Identifier: 0236-5731 (ISSN); 1588-2780 (E-ISSN); 10.1007/s10967-016-5100-2 (DOI)

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    Role of MRI in assessment of patello-femoral derangement in patients with anterior knee pain

    Hadeer Safwat Fahmy, Nivan Hany Khater, Nahed Mohamed Nasef, Nasef Mohamed Nasef
    Egyptian journal of radiology and nuclear medicine, 01 December 2016, Vol.47(4), pp.1485-1492 [Peer Reviewed Journal]
    Directory of Open Access Journals (DOAJ)
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    Title: Role of MRI in assessment of patello-femoral derangement in patients with anterior knee pain
    Author: Hadeer Safwat Fahmy; Nivan Hany Khater; Nahed Mohamed Nasef; Nasef Mohamed Nasef
    Subject: Mri ; Anterior Knee Pain ; Patello-Femoral Derangement ; Medicine
    Description: Objective: To assess the diagnostic accuracy of magnetic resonance imaging (MRI) in evaluating patello-femoral instability as a cause of anterior knee pain (AKP) and its predisposing factors. Methods: 55 knees of 50 adult patients below 40 years complaining of AKP underwent MRI between February 2013 and February 2015. The patients were analyzed prospectively for the presence of bone, hyaline cartilage and soft-tissue abnormalities, as well as anatomic variants that may contribute to patello-femoral maltracking or impingement abnormalities. Our results were compared to those of the arthroscopic and mini open exploration procedures. Results: In the 55 knees analyzed for patello-femoral instability cartilaginous injuries were found in 58%, with an MRI sensitivity of 88%, disruption of the medial patello-femoral ligament (MPFL) in 31% with an MRI sensitivity 84%, joint morphology abnormalities in 74.5% of patients, bone edema in 27% of patients and Hoffa’s fat pad edema in 30 patients...
    Is part of: Egyptian journal of radiology and nuclear medicine, 01 December 2016, Vol.47(4), pp.1485-1492
    Identifier: 0378-603X (ISSN); 10.1016/j.ejrnm.2016.07.020 (DOI)

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    Childhood Autoimmune Hepatitis in Bahrain: a Tertiary Center Experience

    Farid, Eman, Isa, Hasan M, Al Nasef, Mohamed, Mohamed, Rawia, Jamsheer, Huda
    Iranian journal of immunology : IJI, June 2015, Vol.12(2), pp.141-8 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Childhood Autoimmune Hepatitis in Bahrain: a Tertiary Center Experience
    Author: Farid, Eman; Isa, Hasan M; Al Nasef, Mohamed; Mohamed, Rawia; Jamsheer, Huda
    Subject: Autoantibodies -- Blood ; Hepatitis, Autoimmune -- Diagnosis ; Immunosuppression -- Methods
    Description: Autoimmune hepatitis (AIH) in childhood has variable modes of presentation, and the disease should be suspected and excluded in all children presenting with symptoms and signs of prolonged or severe acute liver disease. In AIH, the liver biopsy histopathology shows inflammation in addition to presence of serum autoimmune antibodies and increased levels of immunoglobulin G (IgG). To investigate the situation of childhood autoimmune hepatitis in Bahrain and to compare it with other studies worldwide. A retrospective study describing the AIH pediatric cases diagnosed during the period of Jan 2005 to Dec 2009. We report the clinical, biochemical, histopathological, and immunological findings, mainly autoimmune profile, in addition to response to treatment, of Bahraini children with autoimmune hepatitis. Five Bahraini children, three females and two males were diagnosed as autoimmune hepatitis during the study period. Their ages at presentation ranged from 9 to 15 (median 10.6) years. One of our patients had a fulminating type. Two had other autoimmune related conditions, namely autoimmune sclerosing cholangitis and ulcerative colitis. All were AIH type 1. Variable response to conventional immunosuppressive therapy was found, from an excellent response with good prognosis, to cirrhosis, hepatic failure and liver transplantation. Childhood AIH is a rare medical problem in Bahrain, with both sexes affected and a variable response to immunosuppressive therapy.
    Is part of: Iranian journal of immunology : IJI, June 2015, Vol.12(2), pp.141-8
    Identifier: 1735-367X (E-ISSN); 26119196 Version (PMID); IJIv12i2A6 (DOI)

    • Several versions

    Arthroscopic intralesional curettage for large benign talar dome cysts

    El Shazly Ossama, Abou El Soud Maged M, Nasef Abdelatif Nasef Mohamed
    SICOT-J, 01 January 2015, Vol.1, p.32 [Peer Reviewed Journal]

    • Several versions

    Vapor-liquid equilibrium of ethanol/ethyl acetate mixture in ultrasonic intensified environment

    Mahdi, Taha, Ahmad, Arshad, Ripin, Adnan, Nasef, Mohamed
    Korean Journal of Chemical Engineering, 2014, Vol.31(5), pp.875-880 [Peer Reviewed Journal]

    • Several versions

    Mid-term results following arthroscopic capsular release in patients with primary and secondary adhesive shoulder capsulitis

    Jerosch, Joerg, Nasef, Nasef Mohamed, Peters, Oliver, Mansour, Ali M Reda
    Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, May 2013, Vol.21(5), pp.1195-202 [Peer Reviewed Journal]

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    Radiation grafted poly(vinylidene fluoride)- graft -polystyrene sulfonic acid membranes for fuel cells: Structure-property relationships

    Nasef, Mohamed, Saidi, Hamdani, Dahlan, Khairulzaman
    Chinese Journal of Polymer Science, 2010, Vol.28(5), pp.761-770 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Radiation grafted poly(vinylidene fluoride)- graft -polystyrene sulfonic acid membranes for fuel cells: Structure-property relationships
    Author: Nasef, Mohamed; Saidi, Hamdani; Dahlan, Khairulzaman
    Subject: PVDF films ; Sodium styrene sulfonate ; Radiation-induced grafting ; Proton exchange membranes
    Description: Structure-property relationships for poly(vinylidene fluoride)- graft -polystyrene sulfonic acid (PVDF- g -PSSA) fuel cell membranes prepared by a single step method involving radiation-induced grafting of sodium styrene sulfonate (SSS) onto electron beam (EB) irradiated poly(vinylidene fluoride) (PVDF) films were established. The physico-chemical properties of the membranes such as ion exchange capacity, water swelling and proton conductivity were correlated with the degree of grafting ( G , %) and the structural changes taking place in the membrane matrix during the preparation procedure. The variation in the crystallinity and the thermal stability of membranes was studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively. The membranes were found to undergo substantial structural changes in forms of ionic sites increase, hydrophilicity enhancement, hydrophobicity reduction and crystallinity decrease with the variation in G (%) and the preparation method. The structural and thermal properties of the obtained membranes were also compared with their counterparts prepared by a conventional two-steps method i.e. radiation induced grafting of styrene onto EB irradiated PVDF films followed by sulfonation. The PVDF- g -PSSA membranes obtained by a single-step method were found to have superior properties compared to those obtained by the conventional two-steps method.
    Is part of: Chinese Journal of Polymer Science, 2010, Vol.28(5), pp.761-770
    Identifier: 0256-7679 (ISSN); 1439-6203 (E-ISSN); 10.1007/s10118-010-9138-2 (DOI)