Molecular Analysis of Pseudomonas aeruginosa Metallo-Beta-Lactamase: A First Report of an Iranian Referral Pediatric Hospital

Mahmoudi, Shima; Pourakbari, Babak; Hosseini, Mansoure; Alyari, Amir Esmaeil; Ashtiani, Mohammad Taghi Haghi; Mamishi, Setareh

doi:10.2174/1871526516666161202153806

IDDT

2018

DOI: 10.2174/1871526516666161202153806

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Molecular Analysis of Pseudomonas aeruginosa Metallo-Beta-Lactamase: A First Report of an Iranian Referral Pediatric Hospital

Shima Mahmoudi

Babak Pourakbari

Mansoure Hosseini

et al.

Abstract: Considering the prevalence and clinical importance of MBL producing isolates, rapid identification of them and use of the appropriate infection control measures are necessary to prevent further spread of them by these organisms and to help treatment of Infections.

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Investigation of structural, elastic, thermal, magnetic, optical, and photocatalytic properties of nanosized Mg-Mn-Li ferrites

Assar,

Asal,

Moharram

et al. 2024

J Sol-Gel Sci Technol

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Nanoferrites of (Mn1-xMgx)0.8Li0.1Fe2.1O4 (x: 0–1.0, step 0.2) were synthesized by the sol–gel autocombustion method. The structural properties of the samples were characterized by X-ray diffraction, particle size analysis, transmission electron microscopy, and Fourier transform infrared spectroscopy. The X-ray diffraction patterns for the samples establish the nanoscale (38–54 nm) pure-phase spinel cubic structure (Fd-$$\bar{3}$$ 3 ̅ m). Also, the particle size analysis results demonstrate the narrow distribution of their particle sizes, which range from 10 to 33 nm. The impact of Mg2+ ion concentration on the thermal, elastic, magnetic, and optical properties of these samples was studied. The saturation magnetization decreases from 56.9 to 31.1 emu/g, and the coercivity increases from 65.8 to 106.8G with the addition of Mg2+ ions, showing thin S-shaped hysteresis loops revealing the samples’ soft magnetic behavior. Thermal results indicate that these samples are interesting candidates for thermoelectric applications due to their noticeably lower thermal conductivity, which ranges from 0.3572 to 0.5881 W/mK. The optical band gap values determined by using ultraviolet-visible diffuse reflectance spectroscopy range from 5.11 to 5.25 eV, where quantum confinement for crystallite size triggers a larger band gap. As the concentration of Mg2+ ions increases, their ability to degrade methyl green dye under ultraviolet radiation for 100 min rises from 13.6 to 61.1% with the addition of H2O2, an indication of their photocatalytic activity. Moreover, the optimum ferrite sample, Mn0.4Mg0.4Li0.1Fe2.1O4, maintained its photocatalytic efficiency for at least six reaction cycles. Graphical Abstract

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Investigation of structural, elastic, thermal, magnetic, optical, and photocatalytic properties of nanosized Mg-Mn-Li ferrites

Assar,

Asal,

Moharram

et al. 2024

J Sol-Gel Sci Technol

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Molecular Epidemiology of Carbapenemase-Producing Pseudomonas aeruginosa: An Iranian Referral Hospital-Based Study

Mahmoudi,

Jafari,

Pourakbari

et al. 2024

Foodborne Pathogens and Disease

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Phenotypic and Molecular Survey of Metallo-beta-lactamase-producing Pseudomonas aeruginosa Isolated from Patients with Nosocomial and Non- Nosocomial Infections

Rouhi

Ramazanzadeh

2020

IDDT

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Background: Resistance to antimicrobial agents in Pseudomonas aeruginosa (P. aeruginosa) including carbapenems is a prominent problem in patients. The aim of this study is surveying Metallo-beta-lactamase (MBL)-producing P. aeruginosa isolated from patient specimens with nosocomial and non-nosocomial infections in Kurdistan province, Iran. Methods: In total, 146 Pseudomonas spp. were collected (December 2015 to August 2017). P. aeruginosa isolates were detected by phenotypic and polymerase chain reactions (PCR) of gyrB gene. Combination disk (CD) phenotypic test was used for the identification of MBL-producing strains and PCR was applied for identification of blaIMP and blaVIM genes in P. aeruginosa. Sensitivity and specificity of phenotypic tests were calculated as well. Fisher’s exact test and logistic regression were used for data analysis (p≤0.05). Results: A total of 134 (91.78%) and 133 (91.09%) P. aeruginosa were detected using PCR and the phenotypic test, respectively. Fifty-six (41.79%) clinical isolates were isolated from patients with nosocomial infection. CD test proved that 67 out of 134 (50%) P. aeruginosa isolates were positive for MBL, of which 11 (8.20%) carried blaIMP gene. No significant relationship was found between MBL-producing P. aeruginosa and blaIMP genes; as well as between MBL-producing P. aeruginosa and blaIMP genes with age, sex, city of residence, inpatient/outpatient and specimen's type (p≥0.05). Conclusion: Presence of MBL-producing P. aeruginosa strains and blaIMP genes were proved in this study; thus more precaution should be taken in the administration of carbapenem antibiotics to patients.

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Molecular Analysis of Pseudomonas aeruginosa Metallo-Beta-Lactamase: A First Report of an Iranian Referral Pediatric Hospital

Abstract: Considering the prevalence and clinical importance of MBL producing isolates, rapid identification of them and use of the appropriate infection control measures are necessary to prevent further spread of them by these organisms and to help treatment of Infections.

Cited by 5 publications

References 0 publications

Investigation of structural, elastic, thermal, magnetic, optical, and photocatalytic properties of nanosized Mg-Mn-Li ferrites

Investigation of structural, elastic, thermal, magnetic, optical, and photocatalytic properties of nanosized Mg-Mn-Li ferrites

Molecular Epidemiology of Carbapenemase-Producing Pseudomonas aeruginosa: An Iranian Referral Hospital-Based Study

Phenotypic and Molecular Survey of Metallo-beta-lactamase-producing Pseudomonas aeruginosa Isolated from Patients with Nosocomial and Non- Nosocomial Infections

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