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  1. Article ; Online: Enhancement of the Structure, Thermal, Linear/Nonlinear Optical Properties, and Antibacterial Activity of Poly (vinyl alcohol)/Chitosan/ZnO Nanocomposites for Eco-Friendly Applications.

    Abdelfattah, E M / Elzanaty, H / Elsharkawy, W B / Azzam, M A / Elqahtani, Z M / Alotibi, S / Alyami, M / Fahmy, T

    Polymers

    2023  Volume 15, Issue 21

    Abstract: The preparation of poly (vinyl alcohol)/chitosan/ZnO (PVA/Cs/ZnO) nanocomposite films as bioactive nanocomposites was implemented through an environmentally friendly approach that included mixing, solution pouring, and solvent evaporation. The ... ...

    Abstract The preparation of poly (vinyl alcohol)/chitosan/ZnO (PVA/Cs/ZnO) nanocomposite films as bioactive nanocomposites was implemented through an environmentally friendly approach that included mixing, solution pouring, and solvent evaporation. The nanocomposite films were characterized using various techniques such as X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and UV-Vis spectroscopy. The XRD study revealed the encapsulation of nanoparticles by the PVA/Cs blend matrix. The DSC results showed that the addition of ZnO NPs increased glass transition and melting temperature values of the PVA/Cs blend. ATR-FTIR spectra detected an irregular shift (either red or blue) in some of the characteristic bands of the PVA/Cs nanocomposite, indicating the existence of intra/intermolecular hydrogen bonding creating an interaction between the OH groups of PVA/Cs and ZnO nanoparticles. A thermogravimetric (TGA) analysis demonstrated that the nanocomposites achieved better thermal resistance than a pure PVA/Cs blend and its thermal stability was enhanced with increasing concentration of ZnO nanoparticles. UV analysis showed that with an increase in the content of ZnO NPs, the optical bandgap of PVA/Cs was decreased from 4.43 eV to 3.55 eV and linear and nonlinear parameters were enhanced. Our optical results suggest the use of PVA/Cs/ZnO nanocomposite films for various optoelectronics applications. PVA/Cs/ZnO nanocomposites exhibited significant antibacterial activity against Gram-positive and Gram-negative bacteria. It was found that nanocomposite samples were more effective against Gram-positive compared to Gram-negative bacteria.
    Language English
    Publishing date 2023-10-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym15214282
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Unilateral Sinonasal Disease

    Azzam M.A. Salami

    مجلة كلية الطب, Vol 51, Iss

    analysis of the clinical, radiological and pathological features

    2010  Volume 4

    Abstract: Background: Unilateral sinonasal disease is commonly encountered during the practice of the otolaryngologists, the etiology include a wide variety of diseases ranging from simple acute inflammation to highly malignant diseases. The clinical, computed ... ...

    Abstract Background: Unilateral sinonasal disease is commonly encountered during the practice of the otolaryngologists, the etiology include a wide variety of diseases ranging from simple acute inflammation to highly malignant diseases. The clinical, computed tomography and histopathology differs between inflammatory and neoplastic diseases. Patients and Methods: A prospective study carried out at the Otolaryngology department, Baghdad Medical City, Hospital of specialized surgeries between Jan.2007 to Nov.2008.The study involved 114 patients with symptoms and signs of unilateral sinonasal disease, a careful history, complete clinical examination and radiological investigations were done to all patients as well as flexible nasoendoscopic examination. Sinonasal surgery under general or local anaesthesia with histopathological examination of the removed tissues was done to all patients. Results: Chronic rhinosinusitis with or without nasal polyposis is the commonest cause of a unilateral sinonasal disease (33.3%), followed by antrochoanal polyp (20%) , mucor mycosis (16.7%), benign tumors (13.1%), allergic fungal sinusitis (9.6%) and then malignant tumors (7.6%) in that order. Male gender and the right side were predominant. Purulent discharge and foul odor were the commonest presenting symptoms under inflammatory conditions, while frequent epistaxis, facial swelling and exophthalmos were the main symptoms in neoplastic diseases. Calcifications were observed on CT scan mainly in patients with allergic fungal sinusitis, while bony erosion and destruction was detected in both malignant tumors as well as mucor mycosis, the pattern and extent of bony destruction is more sever in malignant tumors. Conclusion: Chronic rhinosinusitis with or without nasal polyposis is the commonest cause of unilateral sinonasal disease. History, clinical examination, endoscopic as well as radiological examinations are important to reach the diagnosis. However, histopathological confirmation remains obligatory.
    Keywords Unilateral sinonasal disease ; unilateral sinus opacity ; sinus surgery ; Medicine ; R ; Medicine (General) ; R5-920
    Subject code 610
    Language English
    Publishing date 2010-01-01T00:00:00Z
    Publisher Faculty of Medicine University of Baghdad
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Effectiveness and safety of non-fixation method in cochlear implantation

    Azzam M.A. Alsalami / Ahmed M, Rasheed / Ragheed T, Miteab

    مجله كليه طب الكندي, Vol 10, Iss

    2014  Volume 2

    Abstract: ABSTRACTBackground: cochlear implants are electronic devices that convert sound energy into electrical signals to stimulate ganglion cells and cochlear nerve fibers. These devices are indicated for patients with severe to profound sensorineural hearing ... ...

    Abstract ABSTRACTBackground: cochlear implants are electronic devices that convert sound energy into electrical signals to stimulate ganglion cells and cochlear nerve fibers. These devices are indicated for patients with severe to profound sensorineural hearing losses who receive little or no benefit from hearing aids. The implant basically takes over the function of the cochlear hair cells. The implant consists of external components (microphone, speech processor and transmitting coil) and internal components (receiver stimulator and electrode array). The implant is inserted via a trans mastoid facial recess approach to the round window and scala tympani.Objectives: to determine the effectiveness and safety of non fixation method in cochlear implantation.Methods: a prospective study carried out from September 2009 to September 2012 in Gazi Hariri Hospital. Eighty patients with congenital severe –profound sensorineural hearing loss prepared for cochlear implantation involved in the study and divided into 2 groups. Group A includes 40 patients in whom the internal device was fixed to the skull by nylon suture materials through small burr holes on both sides of the well. Group B includes 40 patients in whom the internal device placed in a tight sub pericranial pocket without nylon fixation to the skull. All patients followed postoperatively for 6 months observing wound healing and local complications (hematoma, infection, wound dehiscence, device extrusion and migration).Results: mean age 4.2 years and male-female ratio was 1.3:1.Group A: 1 patient (2.5%) developed minor wound infection treated conservatively. Three patients (7.5%) developedsevere wound infection with wound breakdown and device extrusion despite the use of antibiotics and local rotational flaps, the device was explanted in those 3 patients. Two patients (5%) developed hematoma without history of trauma and treated conservatively. One patient (2.5%) had device migration without affection of its function.Group B: 2 patients developed minor wound infection ...
    Keywords cochlear implantation ; non- fixation ; sub pericranial pocket ; Medicine ; R
    Subject code 616
    Language English
    Publishing date 2014-06-01T00:00:00Z
    Publisher University of Baghdad/ Al-Kindy College of Medicine
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: The Eff ffectt off Septtopllastty on IInfferr iiorr Turrbiinatte Siize

    Ahmed Muhei Rasheed / Nibras Jassam Homadi / Azzam M.A. Al-Salami

    مجله كليه طب الكندي, Vol 10, Iss

    2014  Volume 1

    Abstract: Bac kground:: Septal deviation is one of the commonest anatomical deformities of the nasal skeleton, this deviation is usually accompanied by compensatory hypertrophy of the inferior turbinate on the concave side that will accentuate the severity of ... ...

    Abstract Bac kground:: Septal deviation is one of the commonest anatomical deformities of the nasal skeleton, this deviation is usually accompanied by compensatory hypertrophy of the inferior turbinate on the concave side that will accentuate the severity of nasal obstruction. Objectives: To evaluate the effect of septoplasty on the size of the inferior turbinate in patients with nasal septum deviation. Methods: This is a prospective study of 25 patients attending the otolaryngological department at Al-Jirahat teaching hospital from September 2011 to November 2013, complaining mainly of nasal obstruction. Otolaryngological examination had shown nasal septum deviation. The cross sectional areas of inferior turbinates were measured with computed tomography preoperatively & one year postoperatively. All the patients were treated by septoplasty alone without inferior turbinate surgery. Res ull tts :: The cross-sectional areas of inferior turbinates on the concave side were significantly decreased after 1 year of septoplasty, & significantly increased on the convex side. Conc llus iions :: Septoplasty alone without turbinate surgery in patients with nasal septum deviation & compensatory inferior turbinate hypertrophy may be effective in reversing the size of inferior turbinate.
    Keywords Nasal septum deviation ; inferior turbinate hypertrophy ; septoplasty ; Medicine ; R
    Subject code 610
    Language English
    Publishing date 2014-01-01T00:00:00Z
    Publisher University of Baghdad/ Al-Kindy College of Medicine
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Etiopathogenesis of acute poststreptococcal glomerulonephritis.

    Azzam, M A / Mattoo, T K

    Saudi journal of kidney diseases and transplantation : an official publication of the Saudi Center for Organ Transplantation, Saudi Arabia

    1994  Volume 5, Issue 3, Page(s) 365–370

    Abstract: The relationship between nephritogenic strains of group A beta-hemolytic streptococci (GABS) and acute poststreptococcal glomerulonephritis (APSGN) is well established. Recent studies have cast some doubts on the importance of the M-antigen which is ... ...

    Abstract The relationship between nephritogenic strains of group A beta-hemolytic streptococci (GABS) and acute poststreptococcal glomerulonephritis (APSGN) is well established. Recent studies have cast some doubts on the importance of the M-antigen which is widely used in classifying the nephritogenic strains of GABS. The renal injury occurs as a result of an immune-mediated process which involves the complement system. This leads to deposition of circulating immune complexes and/or their in-situ formation in the kidney resulting in renal damage. Newer antigenic fractions have been identified in GABS, which include; endostreptocin (ESS), nephritis strain associated protein (NSAP), and pre-absorbing antigen (Pa-Ag). These developments have allowed a better insight into the pathogenesis of APSGN.
    Language English
    Publishing date 1994-07
    Publishing country Saudi Arabia
    Document type Journal Article
    ZDB-ID 1379955-1
    ISSN 1319-2442
    ISSN 1319-2442
    Database MEDical Literature Analysis and Retrieval System OnLINE

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