Considering the regulatory presence of residual chlorine in water distribution systems, untreated organic matter may not be the sole contributor to disinfection byproduct (DBP) formation, given the presence of microbial biofilm with extracellular polymeric substances (EPS). This study investigated the influence of bacterial EPS on the formation of carbonaceous DBPs (C-DBPs) and nitrogenous DBPs (N-DBPs), reacting chlorine with Pseudomonas strains that produce different quantities and composition of EPS. When biomass is reacted in excess to chlorine, both C-DBPs and N-DBPs were produced without preference for speciation. However, under an excess of chlorine compared to biomass, increased EPS content led to enhanced formation of DBPs. The DBP yield of haloacetic acids (HAAs) was higher than that of trihalomethanes where dichloroacetic acid was dominant in HAA species. Additionally, chemical composition of EPS influenced the yields of DBPs. The N-DBP yield from P. putida EPS was two times higher than that of P. aeruginosa EPS, which suggested that higher organic nitrogen content in EPS contributes to higher N-DBP yield. Moreover, time-based experiments revealed that DBP formation from biomass occurs rapidly, reaching a maximum in less than four hours. Combined results suggest that bacterial EPS have significant roles in both the formation and fate of DBPs.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/es301905n | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Molecular characterization of exopolysaccharide from Periweissella beninensis LMG 25373 and technological properties in plant-based food production.
Food Res Int
February 2025
Department of Environmental Biology, "Sapienza" University of Rome, Rome, Italy.
Periweissella beninensis LMG 25373, belonging to the recently established Periweissella genus, exhibits unique motility and high adhesion capabilities, indicating significant probiotic potential, including resilience under simulated gastrointestinal conditions. This study demonstrates for the first time that P. beninensis LMG 25373^T produces a dextran-type exopolysaccharide (EPS) with a distinctive high degree of branching (approximately 71 % of α-(1 → 6)-linkages and 29 % α-(1 → 3)-linkages).
View Article and Find Full Text PDFAssessment of the effectiveness of Monte Carlo Simulation for dose control at the Moroccan Boukhalef ionization facility.
Appl Radiat Isot
January 2025
Department of Physics, Nuclear Physics and Techniques Team, Faculty of Science, Ibn Tofail University, Kenitra, Morocco.
Controlling the absorbed dose received by a target is a major challenge encountered during ionizing radiation applications. For experimentally measuring absorbed dose, dosimetric systems are used. On the other hand, in addition to experimental methods of dose measurement, there are other alternatives for calculating absorbed doses, these are numerical methods based on the Monte Carlo method which are very sophisticated and widely used throughout the world.
View Article and Find Full Text PDFExploring socio-economic inequalities in mental healthcare utilization in adults with self-reported psychological distress: a survey-registry linked cohort design.
Epidemiol Psychiatr Sci
January 2025
Department of Global Public Health, Karolinska Institute, Stockholm, Sweden.
Aims: Although individuals with lower socio-economic position (SEP) have a higher prevalence of mental health problems than others, there is no conclusive evidence on whether mental healthcare (MHC) is provided equitably. We investigated inequalities in MHC use among adults in Stockholm County (Sweden), and whether inequalities were moderated by self-reported psychological distress.
Methods: MHC use was examined in 31,433 individuals aged 18-64 years over a 6-month follow-up period, after responding to the General Health Questionnaire-12 (GHQ-12) in 2014 or the Kessler Six (K6) in 2021.
The transcriptional regulation effects of histidine, isoleucine and glutamate on free exopolysaccharide biosynthesis of 937.
Front Microbiol
January 2025
Key Lab of Dairy Biotechnology and Safety Control, Yangzhou University, Yangzhou, Jiangsu, China.
Introduction: The free exopolysaccharide (f-EPS) produced by is a natural texture modifier and has a variety of prebiotic activities. Our previous studies showed f-EPS production from 937 was increased 2-fold in the presence of 15 mM of glutamate, isoleucine, and histidine in the chemically defined medium.
Methods: In this study, we used transcriptomics and qPCR to further explore the specific mechanism of the enhanced effect of 3 amino acids on the f-EPS biosynthesis of 937.
Immune evasion through mitochondrial transfer in the tumour microenvironment.
Nature
January 2025
Division of Cell Therapy, Chiba Cancer Center Research Institute, Chiba, Japan.
Cancer cells in the tumour microenvironment use various mechanisms to evade the immune system, particularly T cell attack. For example, metabolic reprogramming in the tumour microenvironment and mitochondrial dysfunction in tumour-infiltrating lymphocytes (TILs) impair antitumour immune responses. However, detailed mechanisms of such processes remain unclear.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!