Publications by authors named "Nasser H Abbas"

Escherichia coli ST1485 strains belong to the clinically important phylogroup F and have disseminated worldwide in humans, animals, and the environment. Here, we elucidated the pathogenome of a global collection of E. coli ST1485 isolates from diverse sources retrieved from public databases and a high-quality sequenced complete genome of colistin-resistant E.

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To investigate potential DNA methylation in methylcytosine dioxygenases and correlation of genes with vitamin B12/ferritin levels in cancer patients. 200 blood samples were obtained from both cancer patients and healthy individuals. The expression of , and was increased in patients with low vitamin B12 and ferritin levels, while the expression of , and significantly decreased.

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Haloalkophilic bacteria have a potential advantage as a bioremediation organism of high oil-polluted and industrial wastewater. In the current study, Haloalkaliphilic isolates were obtained from Hamralake, Wadi EL-Natrun, Egypt. The phenotype script, biochemical characters, and sequence analysis of bacterial-16S rRNA were used to identify the bacterial isolates; Halomonas HA1 and Marinobacter HA2.

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The aim of this study was to assess the hygienic status of raw milk cheese and determine the trends of virulence and antimicrobial resistance in thermotolerant . Two hundred samples of karish, a popular Egyptian fresh raw milk cheese, were analyzed for coliforms and fecal coliforms using a standard most probable number (MPN) technique. Overall, 85% of samples were unsuitable for consumption, as they exceeded Egyptian standards for coliforms (10 MPN/g), and 65% of samples exhibited coliforms at 44.

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The aim of this study was to determine the occurrence, phenotypic and molecular characteristics of vancomycin-resistant enterococci (VRE), isolated from retail raw cow's milk. One hundred milk samples collected from retail shops in Egypt were examined for the occurrence of VRE by using kanamycin aesculin azide agar supplemented with 4 μg/mL vancomycin. PCR was conducted to determine enterococcal species and to screen the isolated strains for the presence of antibiotic resistance and virulence genes.

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Article Synopsis
  • Biopolymers and nanomaterials, specifically chitosan and alginate, were synthesized to create nanoparticles for the removal of the hazardous pollutant hexavalent chromium from water.
  • The study successfully combined these biopolymers with phycosynthesized iron nanoparticles, which improved the distribution and stabilization of the metal within the composites.
  • Optimal conditions for chromium adsorption were identified as pH 5.0, an adsorbent dose of 4 g/L, a contact time of 210 minutes, and an initial chromium concentration of 75 ppm, leading to complete removal of chromium from the tested solutions.
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Little is known about the virulence in strains isolated from retail dairy products in the Middle East and particularly from Egypt. In this study, the occurrence of in 290 samples of dairy products (raw milk, Ras cheese, pasteurized extended shelf life [ESL] milk) collected from retail shops was investigated. The potential of 126 selected isolates of to possess genes encoding nonhemolytic enterotoxin, hemolysin BL, and cytotoxin K (), and to grow at 7°C was verified.

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Marine bacterial strains are of great interest for their ability to produce secondary metabolites with anticancer potentials. Isolation, identification, characterization and anticancer activities of isolated bacteria from El-Hamra Lake, Wadi El-Natrun (Egypt) were the objectives of this study. The isolated bacteria were identified as a moderately halophilic alkaliphilic strain.

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There is emerging evidence that food of animal origin may be responsible for the spread of multidrug resistant extraintestinal pathogenic Escherichia coli in the community. Here, we describe the emergence of colistin resistance gene, mcr-1, in a strain belonging to the dominant uropathogenic E. coli ST69 lineage.

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