Time filter

Source Type

As Samawah, Iraq

Al Muthanna University is an Iraqi university located in Samawah, Al Muthanna Province, Iraq. It was established in 2007. Wikipedia.

Adam F.,Universiti Sains Malaysia | Hello K.M.,Al Muthanna University | Chai S.-J.,Universiti Sains Malaysia
Chemical Engineering Research and Design | Year: 2012

A simple route is demonstrated for the efficient immobilization of silica with l-(N-α-acetylphenylalanine)-ruthenium(III) complex. This catalyst was labelled as RHAPhe-Ru. The 29Si MAS NMR showed the presence of T 3, T 2, Q 3 and Q 4 silicon centers. The 13C MAS NMR showed the presence of three chemical shifts consistent with the three carbon atoms of the propyl group. The catalytic performance of RHAPhe-Ru was tested in the esterification of ethyl alcohol. A conversion of 82% was achieved, with 100% selectivity towards ethyl acetate. The catalyst could be regenerated by washing with ethanol and drying at 110°C for 24h without significant loss in reactivity. © 2011 The Institution of Chemical Engineers.

Hello K.M.,Al Muthanna University | Hasan H.R.,University of Baghdad | Sauodi M.H.,University of Baghdad | Morgen P.,University of Southern Denmark
Applied Catalysis A: General | Year: 2014

Titration of chlorosulphonic acid against sodium silicate was carried out via a simple one pot synthesis at room temperature to form an acid catalyst denoted as RHSO3H. The BET measurements of the catalyst showed the surface area to be 80 m2 g-1. The FT-IR clearly showed the presence of -SO2- absorption band at the expected range. The XPS showed the presence of O, Si, and S. The presence of S 2p on the XPS spectra indicated that the sulphonic acid groups (-SO3H) are included into the catalyst structure. The RHSO3H was efficient for the hydrolysis of cellulose, with maximum glucose yields over 99% at 120 C with 100% selectivity. As the solubility of cellulose is very important factor to make the hydrolysis much more easily. It was observed that the mixture of DMF/LiCl or cyclohexanol/LiCl has high ability to dissolve cellulose. The catalyst was simple in its preparation, stable during the cellulose hydrolysis in addition to repeatedly without a significant loss of its catalytic activity. © 2014 Elsevier B.V.

Zhang T.,University of Waterloo | Muraih J.K.,Al Muthanna University | MacCormick B.,BioMedica Diagnostics | Silverman J.,Cubist Pharmaceuticals Inc. | Palmer M.,University of Waterloo
Biochimica et Biophysica Acta - Biomembranes | Year: 2014

Daptomycin is a lipopeptide antibiotic that is used clinically to treat severe infections caused by Gram-positive bacteria. Its bactericidal action involves the calcium-dependent binding to membranes containing phosphatidylglycerol, followed by the formation of membrane-associated oligomers. Bacterial cells exposed to daptomycin undergo membrane depolarization, suggesting the formation of channels or pores in the target membranes. We here used a liposome model to detect and characterize the permeability properties of the daptomycin pores. The pores are selective for cations, with permeabilities being highest for Na+, K+, and other alkali metal ions. The permeability is approximately twice lower for Mg++, and lower again for the organic cations choline and hexamethonium. Anions are excluded, as is the zwitterion cysteine. These observations account for the observed depolarization of bacterial cells by daptomycin and suggest that under typical in vivo conditions depolarization is mainly due to sodium influx. © 2014 Elsevier B.V. All rights reserved.

Muhi A.,Yamanashi University | Muhi A.,Al Muthanna University | Ichikawa T.,Yamanashi University | Motosugi U.,Yamanashi University | And 5 more authors.
Journal of Magnetic Resonance Imaging | Year: 2012

Purpose: To differentiate mass-forming autoimmune pancreatitis (AIP) from pancreatic carcinoma by means of analysis of both computed tomography (CT) and magnetic resonance imaging (MRI) findings. Materials and Methods: Ten patients with mass-forming AIP diagnosed by revised clinical criteria of Japan Pancreas Society and 70 patients with pathologically proven pancreatic carcinoma were enrolled in this retrospective study. Two radiologists independently evaluated the CT and MR imaging findings. The sensitivity, specificity, and odds ratio of significant imaging findings and combinations of findings were calculated. Results: Seven findings were more frequently observed in AIP patients: (i) early homogeneous good enhancement, (ii) delayed homogeneous good enhancement, (iii) hypoattenuating capsule-like rim, (iv) absence of distal pancreatic atrophy, (v5) duct penetrating sign, (vi) main pancreatic duct (MPD) upstream dilatation ≤ 4 mm, and (vii) an apparent diffusion coefficient (ADC) ≤ 0.88 × 10 -3 mm 2/s. When the findings of delayed homogeneous enhancement and ADC ≤ 0.88 × 10 -3 mm 2/s were both used in diagnosis of mass-forming AIP, a sensitivity of 100% and a specificity of 100% were achieved. When 4 of any of the 7 findings were used in the diagnosis of AIP, a sensitivity of 100% and a specificity of 98% were achieved. Conclusion: Analysis of a combination of CT and MR imaging findings allows for highly accurate differentiation between mass-forming AIP and pancreatic carcinoma. © 2011 Wiley Periodicals, Inc.

Hello K.M.,Al Muthanna University | Adam F.,Universiti Sains Malaysia | Ali T.H.,Universiti Sains Malaysia
Journal of the Taiwan Institute of Chemical Engineers | Year: 2014

Silica extracted from rice husk ash was functionalized with 3-mercptopropyltrimethoxysilane (MPTMS) and then oxidized to sulfonic acid at room temperature and pressure. The FT-IR analysis shows bands at 1354-1166cm-1 due to the asymmetric and symmetric stretching of SO2 group. The 13C CP MAS NMR of RHAPrSO3H showed chemical shifts at 58.6, 12.1 and 23.0ppm attributed to the three carbon atoms of the propyl chain. The pyridine acidity test showed strong bands at 1510, 1541cm-1 in the FT-IR spectrum attributed to the Brønsted acid sites. In the alkylation of phenol using RHAPrSO3H, a conversion of ca. 75% was achieved at the reaction temperature of 120°C. The catalyst could be regenerated by washing and drying at 185°C for 24h. The catalyst was reused several times without loss of catalytic activity. © 2013 Taiwan Institute of Chemical Engineers.

Discover hidden collaborations