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- Mahmmoud Sayed, Abd El-sadek, et al.
(författare)
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Electronic transport mechanism of CdTe nanocrystalline
- 2011
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Ingår i: Materials Chemistry and Physics. - : Elsevier BV. - 0254-0584. ; 130:1-2, s. 591-597
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Tidskriftsartikel (refereegranskat)abstract
- CdTe nanocrystalline powder was synthesized by chemical process. The structure of CdTe nanocrystalline was investigated by means of X-ray diffraction (XRD) technique, energy-dispersive X-ray analysis (EDAX) spectrum and transmission electron microscopy (TEM). The selected area electron diffraction (SAED) study confirms the crystallinity of the CdTe nanocrystalline. Some structural parameters such as the mean crystallite size, the dislocation density and the strain were calculated. The temperature dependence of the dc and ac conductivity was measured in the temperature range 293-423 K. It was found that the dc conductivity is thermally activated type. Values of dc activation energy and the pre-exponential were determined. The ac conductivity was found to increase with increasing both the temperature and frequency and follows the power low. The frequency exponent s was found to decrease with increasing temperature. The correlated barrier hopping (CBH) model was found to be applying to the ac conductivity data. The maximum barrier height W(m) and the density of localized states N(E(F)) were calculated and equal to 0.47 eV and 8.82 x 10(22) to 1.43 x10(23) eV(-1) cm(-3), respectively. CdTe nanomaterial is a good candidate for semiconductor devices due to its high conductivity. (C) 2011 Elsevier B.V. All rights reserved.
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- Taha, Rania H., et al.
(författare)
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Synthesis and characterization of a symmetrically substituted cyclodiphosph(V)azane ligand (H4L') and its transition metal complexes for antimicrobial and antitumor investigation
- 2020
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Ingår i: Egyptian Journal of Chemistry. - : Egypts Presidential Specialized Council for Education and Scientific Research. - 0449-2285 .- 2357-0245. ; 63:8, s. 3097-3107
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Tidskriftsartikel (refereegranskat)abstract
- A NEW ligand of geminal cyclodiphosph(V)azane derivatives, 1,3-di-[N/-2,6-dimethoxyLl-pyrimidnylsulfanilamide12,4-di-IN/-2-quinoxalinylsulfanilamidel-2,4dichloroc- yelodiphosph(V)azane (H4L') was prepared. The ligand and its related complexes were characterized by different physicochemical techniques, namely; IR, UV vis, mass, 'H NMR, molar conductance, magnetic, solid reflectance, and thermal analysis The spectral data revealed that the ligand behaves as ionic in nature and coordinated to the metal ions via enolic-OH of sulphonamide group and pyrimidine N. The molar conductance data reveal that the complexes were electrolytes, while UV vis, solid reflectance and magnetic moment data have been shown that the complexes have octahedral geometry. The thermal behavior of the complexes was also studied. The ligand and its metal complexes showed a high to moderate antimicrobial activities against deferent strains of bacteria and fungi, also showed anticancer activity against colon carcinoma HCT116.
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- Zemmour, A, et al.
(författare)
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High-risk clones of extended-spectrum β-lactamase-producing Klebsiella pneumoniae isolated from the University Hospital Establishment of Oran, Algeria (2011-2012)
- 2021
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Ingår i: PloS one. - : Public Library of Science (PLoS). - 1932-6203. ; 16:7, s. e0254805-
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the study was to characterize the resistome, virulome, mobilome and Clustered Regularly Interspaced Short Palindromic Repeats-associated (CRISPR-Cas) system of extended-spectrum β-lactamase producingKlebsiella pneumoniae(ESBL-KP) clinical isolates and to determine their phylogenetic relatedness. The isolates were from Algeria, isolated at the University Hospital Establishment of Oran, between 2011 and 2012. ESBL-KP isolates (n = 193) were screened for several antibiotic resistance genes (ARGs) using qPCR followed by Pulsed-Field Gel Electrophoresis (PFGE). Representative isolates were selected from PFGE clusters and subjected to whole-genome sequencing (WGS). Genomic characterization of the WGS data by studying prophages, CRISPR-Cas systems, Multi-Locus Sequence Typing (MLST), serotype, ARGs, virulence genes, plasmid replicons, and their pMLST. Phylogenetic and comparative genomic were done using core genome MLST and SNP-Based analysis. Generally, the ESBL-KP isolates were polyclonal. The whole genome sequences of nineteen isolates were taken of main PFGE clusters. Sixteen sequence types (ST) were found including high-risk clones ST14, ST23, ST37, and ST147. Serotypes K1 (n = 1), K2 (n = 2), K3 (n = 1), K31 (n = 1), K62 (n = 1), and K151 (n = 1) are associated with hyper-virulence. CRISPR-Cas system was found in 47.4%, typed I-E and I-E*. About ARGs, from 193 ESBL-KP, the majority of strains were multidrug-resistant, the CTX-M-1 enzyme was predominant (99%) and the prevalence of plasmid-mediated quinolone resistance (PMQR) genes was high withaac(6′)-lb-cr(72.5%) andqnr’s(65.8%). From 19 sequenced isolates we identified ESBL, AmpC, and carbapenemase genes:blaCTX-M-15(n = 19),blaOXA-48(n = 1),blaCMY-2(n = 2), andblaCMY-16(n = 2), as well as non-ESBL genes:qnrB1(n = 12),qnrS1(n = 1) andarmA(n = 2). We found IncF, IncN, IncL/M, IncA/C2, and Col replicon types, at least once per isolate. This study is the first to reportqnrSin ESBL-KP in Algeria. Our analysis shows the concerning co-existence of virulence and resistance genes and would support that genomic surveillance should be a high priority in the hospital environment.
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