Sürdürülebilir Kalkınma Amaçları

• 3

• MakaleAçık Erişim2025/r/gumushane/14055
  Investigation of virulence factor genes and biofilm formation of antibiotic resistant clinical E.coli isolates

  Mumin, Yahye Mohamud; Yüksel, Gamze; Özad Düzgün, Azer

  Purpose: The aim of this study is to investigate the antibiotic sensitivity, presence of virulence genes and biofilm formation capacity of 90 clinical E. coli isolates. Methods: The presence of virulence genes in E. coli isolates were investigated by PCR. Ninety clinical isolates of E. coli were subjected to biofilm quantitative analysis using the semi-quantitative crystal violet staining method. Results: it was observed that the isolates were resistant to quinolone, cephalosporin, aminoglycoside, carbapenem and penicillin group antibiotics. The presence of virulence factor genes were observed in a total of 86/90 E. coli. The highest rate of fim (92.2 %) virulence factor gene was detected in the strains. Afa, pap, cnf, sfa, hly were detected in 30 %, 13 %, 13 %, 3.3 %, 2.2 % respectively. Also, 13 different virulence factor gene patterns were determined in 90 E. coli isolates. Of the 90 E. coli isolates whose biofilm-forming capacities were evaluated, 42 were found to have biofilm-forming capacity. Of these 26 (28.8 %) the weak, 12 (13.3 %) moderate and 4 (4.4 %) strong biofilm-forming. Also, statistical analysis was performed to investigate the relationship between virulence factor genes and biofilm formation, and none of the 7 genes analyzed showed a significant relationship with biofilm formation. Conclusion: since pathogenic E. coli is an important public health problem, investigating antibiotic resistance, virulence factor genes and biofilm formation in bacterial pathogens is important for better treatment options.

  • 
  İncele
• MakaleAçık Erişim2024/r/gumushane/12720
  Investigation of Antibiofilm and Antibacterial Properties of Green Synthesized Silver Nanoparticles from Aqueous Extract of Rumex sp.

  Akay, Seref; Yüksel, Gamze; Özad Düzgün, Azer

  The decrease in the effectiveness of conventional drugs as a result of the growth of resistance to antibiotics has increased the need for innovative tools to control the infections. At this point, metallic nanoparticles, in particular silver nanoparticles, have appeared as a promising method. In the current study, the extract of Rumex sp. (Labada, dock) leaves was used as a reducing agent for the formation of silver nanoparticles. Unlike similar studies, in this study the synthesis conditions were optimized by changing the extract ratio and silver nitrate concentration. Morphological investigations of synthesized silver nanoparticles showed that spherical homogeneous particles at size under 100 nm had been produced. SEM/EDS and FTIR analyses showed that plant components are involved in the synthesis of nanoparticles. It was also determined that higher extract ratio reduced nanoparticle size. The antimicrobial effects of the synthesized nanoparticles against Gram-positive and Gram-negative bacteria were tested, and it was determined that all nanoparticles exhibited activity against both groups. Rumex sp. silver nanoparticles (NPs) were revealed to exhibit antibiofilm activity against three different isolates with moderate and strong biofilm-forming ability. The NPs reduced the biofilm-forming capacity of Acinetobacter baumannii and Klebsiella pneumonaie by 2.66-fold and 3.25-fold, whereas they decreased the Escherichia coli biofilm-forming capacity by 1.25-fold. The investigation of microbial biofilm could play an important role in developing new strategies for treatment options. Our results suggest that Rumex sp. silver NPs may have a high potential for use in the treatment of pathogenic strains.

  • 
  İncele
• MakaleAçık Erişim2023/r/gumushane/12748
  Detection of virulence factor genes, antibiotic resistance genes and biofilm formation in clinical Gram-negative bacteria and first report from Türkiye of K.oxytoca carrying both bla OXA-23 and bla OXA-51 genes

  Özad Düzgün, Azer; Yüksel, Gamze

  The Gram-negative bacteria were isolated from various samples and antibiotic susceptibility testing were performed. The strains were screened by PCR for class 1 integron, virulence and antibiotic resistance genes. blaOXA-23 and blaOXA-51 genes positive samples were cloned into the pGEM-T vector and the plasmids were sent for DNA sequence analysis. The isolates were showed resistance to quinolone, cephalosporin, aminoglycoside, carbapenem and penicillin group antibiotics. Virulence factor genes were identified in 121 strain. The most common virulence gene was determined to be aer (29.78%), followed by sfa (28.19%), afa (27.12%), cnf (21.27%), pap (12.76%) and hly (12.76%). In addition, 34 different virulence patterns were observed. Plasmid-mediated quinolone resistance genes were detected 15 of67 quinolone-resistant isolates. Among carbapenem resistant strains, blaOXA-23 gene was detected in 16 and blaOXA-51 gene in 19 isolates. The strains producing OXA-23 and OXA-51 were Klebsiella oxytoca, Acinetobacter baumannii, E.coli and P.mirabilis. In this study, clinical isolate K. oxytoca carrying both blaOXA-23 and blaOXA-51 genes were identified first time from Türkiye. A high predominance (88.82%) of class 1 integron was detected. In addition, determined that 46.27% of the isolates had the ability to form biofilms. In conclusion since the limited treatment options of antibiotic-resistant Gram-negative pathogens that cause serious infections are an important problem in terms of public health it is important to investigate antibiotic resistance, virulence factor genes and biofilm formation in these pathogens.

  • 
  İncele
• Yüksek Lisans TeziAçık Erişim2022/r/gumushane/21255
  Klinik gram negatif bakterilerde virulans faktör genleri ile biyofilm oluşumlarının belirlenmesi ve rumex gümüş nanopartikülünün antibiyofilm aktivitesinin araştırılması

  Gamze Yüksel

  Çeşitli örneklerden 188 Gram negatif bakteri izole edilmiş ve antibiyotik duyarlılık testleri yapılmıştır.188 suşta, sınıf 1 integron, virülans ve antibiyotik direnç genlerinin varlığı PCR ile araştırıldı. blaOXA-23 ve blaOXA-51 genleri pozitif olan örnekler, pGEM-T vektörüne klonlandı ve plazmitler, DNA dizi analizine gönderildi. Suşların biyofilm oluşturma kapasiteleri ve Rumex gümüş nanopartikülün antibiyofilm etkisi kantitatif olarak belirlendi. İzolatlarda sırasıyla aer (%29.78), sfa (%28.19), afa (%27.12), cnf (%21.27), pap (%12.76) ve hly (%12.76) virulans faktör genleri bulundu. Sınıf 1 integronlar suşlar arasında yüksek oranda (%88.82) tespit edildi. İzolatların %46.27'sinin biyofilm oluşturma yeteneğine sahip olduğu belirlendi. PMQR genleri, 15 izolatta tespit edildi. 16 suşta blaOXA-23 geni, 19 izolatta ise blaOXA-51 geni tespit edildi. Bu çalışmada Türkiye'den ilk kez hem blaOXA-23 hem de blaOXA-51 genlerini taşıyan klinik K. oxytoca izolatı tanımlandı. Rumex gümüş nanoparçacıklarının (NP'ler), orta ve güçlü biyofilm oluşturma kabiliyetine sahip farklı izolatlara karşı antibiyofilm aktivitesi gösterdiği ortaya çıktı. NP'ler, 2.66 kat A. baumannii'nin, 3.25 kat K. pneumonaie'nin ve 1.25 kat E.coli'nin biyofilm oluşturma kapasitesini azalttığı gözlemlendi. Mikrobiyal biyofilmin araştırılması, tedavi seçenekleri için yeni stratejiler geliştirmede önemli bir rol oynayabilir. Sonuç olarak, ciddi enfeksiyonlara neden olan antibiyotiğe dirençli Gram negatif patojenlerin tedavi seçeneklerinin sınırlı olması halk sağlığı açısından önemli bir sorun olduğundan, bu patojenlerde antibiyotik direnci, virülans faktör genleri ve biyofilm oluşumunun araştırılması önemlidir.

  İncele