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  1. Article ; Online: Lutembacher’s syndrome accompanied by partial anomalies of pulmonary veins in a 70-year-old male

    Mohammad Nasser Khattab / Mohammad Alhalabi / Karam Alkounsol / Majed Othman / Nizar Hujair

    European Journal of Case Reports in Internal Medicine (2023)

    a case of congenital heart disease in the elderly

    2023  

    Abstract: Lutembacher’s syndrome is a rare disease defined as the combination of atrial septal defect and mitral stenosis, which relieves the progression of symptoms resulting from mitral stenosis. We present a case of a previously asymptomatic 70-year-old man ... ...

    Abstract Lutembacher’s syndrome is a rare disease defined as the combination of atrial septal defect and mitral stenosis, which relieves the progression of symptoms resulting from mitral stenosis. We present a case of a previously asymptomatic 70-year-old man having Lutembacher’s syndrome with sinus venosus type of interatrial defect associated with partial anomalous pulmonary venous drainage. Our patient’s only complaint was of mild exertional dyspnea, which started six months prior to referral. Clinical suspicion of the combination of defects arose during transthoracic echocardiography. The patient underwent transesophageal echocardiography and multi-slice computed tomography for defect confirmation. The combination of Lutembacher’s syndrome with this complex deformity of pulmonary venous drainage has rarely been described. Such complex congenital defects with multifaceted physiological repercussions can go largely undiagnosed for the patients affected for most of their lifetimes.
    Keywords congenital heart defect ; elderly congenital heart disease ; adult congenital defect ; atrial septal defect ; mitral stenosis ; anomalous pulmonary venous return ; Medicine ; R
    Subject code 610
    Language English
    Publishing date 2023-10-01T00:00:00Z
    Publisher SMC MEDIA SRL
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Development of a Multifunctional Wet Laid Nonwoven from Marine Waste Posidonia oceanica Technical Fiber and CMC Binder

    Saoussen Zannen / Mohamed Taher Halimi / Mohamed Ben Hassen / Emad Hashim Abualsauod / Asem Majed Othman

    Polymers, Vol 14, Iss 865, p

    2022  Volume 865

    Abstract: A Posidonia oceanica waste marine plant was used to produce a wet-laid nonwoven web for multifunction applications. To study the effect of some parameters related to the web characteristics (sheet weight, binder ratio, and pulp ratio) on the mechanical ... ...

    Abstract A Posidonia oceanica waste marine plant was used to produce a wet-laid nonwoven web for multifunction applications. To study the effect of some parameters related to the web characteristics (sheet weight, binder ratio, and pulp ratio) on the mechanical and physical properties of the web, we used a Box–Behnken design plan with three levels. The diagram of the superposed contours graphic method was used to find the optimum parameters of the process for the application of the Posidonia nonwoven fiber on an insulation field. With the measurement of the thermal conductivity properties using the box method, the results demonstrated that the nonwoven fiber from Posidonia oceanica marine waste had good insulation properties in comparison with other classical natural fibers (hemp, flax) used in the field of insulation with the big advantage of being a natural product.
    Keywords Posidonia oceanica fiber ; Box–Behnken design ; wet-laid nonwoven ; thermal conductivity ; insulation ; Organic chemistry ; QD241-441
    Subject code 621
    Language English
    Publishing date 2022-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: A Multi-Attribute Decision-Making Model for the Selection of Polymer-Based Biomaterial for Orthopedic Industrial Applications

    Ali Rizwan / Emad H. Abualsauod / Asem Majed Othman / Suhail H. Serbaya / Muhammad Atif Shahzad / Abdul Zubar Hameed

    Polymers, Vol 14, Iss 1020, p

    2022  Volume 1020

    Abstract: The potential of quantifying the variations in IR active bands was explored while using the chemometric analysis of FTIR spectra for selecting orthopedic biomaterial of industrial scale i.e., ultra-high molecular weight PE (UHMWPE). The nano composites ... ...

    Abstract The potential of quantifying the variations in IR active bands was explored while using the chemometric analysis of FTIR spectra for selecting orthopedic biomaterial of industrial scale i.e., ultra-high molecular weight PE (UHMWPE). The nano composites UHMWPE with multi-walled carbon nano-tubes (MWCNTs) and Mg-silicate were prepared and irradiated with 25 kGy and 50 kGy of gamma dose. Principal component analysis (PCA) revealed that first three principal components (PCs) are responsible for explaining the >99% of variance in FTIR data of UHMWPE on addition of fillers and/or irradiation. The factor loadings plots revealed that PC-1 was responsible for explaining the variance in polyethylene characteristics bands and the IR active region induced by fillers i.e., 440 cm −1 , 456 cm −1 , from 900–1200 cm −1 , 1210 cm −1 , 1596 cm −1 , PC-2 was responsible for explaining the variance in spectra due to radiation-induced oxidation and cross linking, while the PC-3 is responsible for explaining the variance induced because of IR active bands of MWCNTs. Hierarchy cluster analysis (HCA) was employed to classify the samples into four clusters with respect to similarity in their IR active bands which is further confirmed by PCA. According to multi attribute analysis with PCA and HCA, 65 kGy irradiated sample is optimum choice from the existing alternatives in the group of irradiated pristine UHMWPE, UHMWPE/Mg-silicate irradiated with 25 kGy of gamma dose was the optimum choice for UHWMPE/Mg-silicate nano composites, and UHMWPE/γMWCNTs composites containing 1.0% dof γ MWCNTs for UHMWPE/MWCNTs nanocomposites, respectively. The results show the effectiveness of quantifying the variance for decision as far as optimization of biomaterials in orthopedic industrial applications is concerned.
    Keywords chemo metric analysis ; UHMWPE ; FTIR spectroscopy ; industrial applications ; MWCNTs ; PCA ; Organic chemistry ; QD241-441
    Subject code 333
    Language English
    Publishing date 2022-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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