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Targeted inhibition of PqsR in Pseudomonas aeruginosa PAO1 quorum-sensing network by chalcones as promising antibacterial compounds.
Mol Biol Rep
January 2025
Department of Pharmaceutical Control, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
Background: Pseudomonas aeruginosa's inherent and adapted resistance makes this pathogen a serious problem for antimicrobial treatments. Furthermore, its biofilm formation ability is the most critical armor against antimicrobial therapy, and the virulence factors, on the other hand, contribute to fatal infection and other recalcitrant phenotypic characteristics. These capabilities are harmonized through cell-cell communication called Quorum Sensing (QS), which results in gene expression regulation via three major interconnected circuits: las, rhl, and pqs system.
View Article and Find Full Text PDFChemical composition, antibacterial and antioxidant activities of Piper betle and Anethum graveolens essential oils against Methicillin-resistant Staphylococcus aureus clinical isolates.
Braz J Microbiol
January 2025
Amity Institute of Biotechnology, Amity University Uttar Pradesh, Sector-125, Noida, Uttar Pradesh, 201313, India.
Methicillin-resistant Staphylococcus aureus (MRSA) is one of the leading causes of infection worldwide due to its antimicrobial resistance. Plant-derived essential oils (EOs) have undergone extensive observational and clinical research to explore their antimicrobial properties. The present study aimed to check mec A positive MRSA isolates using sequencing analysis, determination of chemical composition using gas chromatography-mass spectroscopy (GC-MS), antioxidant, and antimicrobial activity of Anethum graveolens and Piper betle EOs against the infectious agent MRSA.
View Article and Find Full Text PDFUnderstanding Anionic Hyperporphyrins: TDDFT Calculations on Peripherally Deprotonated -Tetrakis(4-hydroxyphenyl)porphyrin.
J Phys Chem A
January 2025
Department of Chemistry, UiT─The Arctic University of Norway, N-9037 Tromsø, Norway.
Presented herein is a DFT/TDDFT study of -tetrakis(4-hydroxyphenyl)porphyrin (H[THPP]) and its -deprotonated tetraanionic form; the latter was modeled as both a free tetraanion and with various counterions. Based on our calculations, the experimentally observed hyperporphyrin spectra are attributed to an admixture of phenol/phenoxide character into the a-type HOMO of tetraphenylporphyrin. The admixture results in an elevation of the orbital energy of the HOMO in relation to other frontier orbitals, which accounts for the observed spectral redshifts.
View Article and Find Full Text PDFReview of the potential of bioactive compounds in seaweed to reduce histamine formation in fish and fish products.
Ital J Food Saf
January 2025
Department Fishery Product Technology, Faculty of Fisheries and Marine Science, Brawijaya University, Malang, East Java.
The formation of histamine in food is influenced by temperature, and histamine growth can be inhibited by maintaining a cold chain. However, simply relying on temperature control is insufficient, as certain bacteria can produce the enzyme histidine decarboxylase even at temperatures below 5°C. To address this issue, various methods, such as modified atmosphere packaging, high hydrostatic pressure, and irradiation, have been developed to control histamine in fishery products.
View Article and Find Full Text PDFWastewater biotreatment and bioaugmentation for remediation of contaminated sites at an oil recycling plant.
Water Sci Technol
January 2025
Center for Sustainable Development, College of Arts and Sciences, Qatar University, Doha 2713, Qatar.
This work focused on the biotreatment of wastewater and contaminated soil in a used oil recycling plant located in Bizerte. A continuous stirred tank reactor (CSTR) and a trickling filter (TF) were used to treat stripped and collected wastewater, respectively. The CSTR was started up and stabilized for 90 days.
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