International Microbiology

Abstract The current work aimed to formulate Rosemary essential oil nanoparticles (Ros-ES-NPs) and evaluate their antimicrobial effect in comparison with free oil (Ros- ES). Physicochemical characterization was performed using Fourier-transform infrared spectroscopy (FTIR), dynamic light scattering, zeta potential analysis, transmission electron microscop y (TEM), scanning electron microscopy (SE…

Abstract Copper is an essential redox-active trace element that serves as a catalytic cofactor in many bacterial enzymes; however, excess intracellular copper is highly cytotoxic due to mismetallation of metalloproteins and copper-driven redox cycling that promotes reactive oxygen species generation through Fenton-like chemistry. To prevent these destructive effects, bacteria maintain near-zero l…

Candida albicans, a commensal yeast, causes severe infections especially in immunocompromised patients, and microbial secondary metabolites offer sustainable sources for novel antifungal development. This study investigated the antifungal activity against C. albicans CMCC98001 and antitumor potential of phenazines from Pseudomonas sp. strain DH. At 20 µg/mL, 1-hydroxyphenazine (2) and phenazine-1…

Xylanases are crucial enzymes for the bioconversion of lignocellulosic biomass. Despite extensive studies on microbial xylanase producers, the identification of new indigenous strains with enhanced enzyme activity remains a significant challenge. While there is some existing research on the isolation of xylanase-producing bacteria from Iran, our study specifically aimed to comprehensively isolate…

This study aimed to compare the virulence and resistance gene profiles, capsular serotypes, and molecular epidemiology of hypervirulent Klebsiella pneumoniae (hvKP) and classical Klebsiella pneumoniae (cKP) strains isolated from patients with liver abscesses in China, and to evaluate their phenotypic virulence using in vitro and in vivo models. A total of 83 non-repetitive K. pneumoniae strains w…

In microbiome research, community heterogeneity of microbiota holds significant theoretical and practical implications, with both microbiome diversity and inter-subject heterogeneity being central objectives of the Human Microbiome Project (HMP). While diversity analysis, such as Shannon entropy, has become a de facto standard in microbiome studies, heterogeneity has been less frequently examined…

Algae are a sustainable natural resource because of their beta-carotene content. Therefore, this study demonstrates the extraction of the bioactive compound beta-carotene as a protein pigment from the green alga Westella botryoides and its potential use as an antibacterial agent against pathogenic bacterial cells. This study investigates the interactions between beta-carotene and bacterial recept…

Biofilms are structured microbial communities with wide-ranging industrial applications. In Saccharomyces cerevisiae, biofilm formation can influence fermentation, improve microbial stability, and enhance production efficiency. This study evaluates the fermentation performance of S. cerevisiae in both planktonic and biofilm states under standard and high-carbon media. During a 96-hour fermentatio…