14 documents found, page 1 of 2
Chlorinated cyanurates and potassium salt of peroxymonosulphate as antimicrobia...
Oliveira, Isabel Maria; Gomes, Inês B.; Simões, Lúcia Chaves; Simões, Manuel LopesThe understanding of microbial susceptibility to disinfectants is an important step to provide drinking water (DW) of adequate microbiological quality. In drinking water distribution systems (DWDS) the application of disinfectants is the main approach to control microorganisms. Although chlorine has been commonly used for DW treatment, the increase of microbial resistance and the production of harmful disinfect...
Microalgal-based removal of contaminants of emerging concern
Sousa, Henrique; Sousa, Cátia A.; Simões, Lúcia Chaves; Simões, Manuel LopesThe presence of contaminants of emerging concern (CECs) in the environment has been recognized as a worldwide concern. In particular, water pollution by CECs is becoming a major global problem, which requires ongoing evaluation of water resources policies at all levels and the use of effective and innovative wastewaters treatment processes for their removal. Microalgae have been increasingly recognized as relev...
The effects of chemical and mechanical stresses on Bacillus cereus and Pseudomo...
Gomes, Inês B.; Lemos, Madalena; Fernandes, Susana; Borges, Anabela; Simões, Lúcia Chaves; Simões, Manuel LopesBiofilm control is mainly based on chemical disinfection, without a clear understanding of the role of the biocides and process conditions on biofilm removal. This study aims to understand the effects of a biocide (benzyldimethyldodecyl ammonium chlorideBDMDAC) and mechanical treatment (an increase of shear stress -w) on single- and dual-species biofilms formed by Bacillus cereus and Pseudomonas fluorescens on ...
Legionella pneumophila
Gonçalves, Inês G.; Simões, Lúcia Chaves; Simões, Manuel LopesLegionella pneumophila is an intracellular pathogen, ubiquitous in the environment and considered opportunistic. It is the leading cause of legionellosis, which can be present in its nonpneumonic form (Pontiac fever) and acute pneumonic form (Legionnaires` disease – LD). In the soil and aquatic systems, L. pneumophila can invade and survive intracellularly in various protozoans. The ability to proliferate withi...
Overview on the hydrodynamic conditions found in industrial systems and its imp...
Fernandes, Susana; Gomes, Inês B.; Simões, Lúcia Chaves; Simões, Manuel LopesSupplementary data to this article can be found online at https://doi.org/10.1016/j.cej.2021.129348.; Biofouling is the unwanted accumulation of deposits on surfaces, composed by organic and inorganic particles and (micro)organisms. Its occurrence in industrial equipment is responsible for several drawbacks related to operation and maintenance costs, reduction of process safety and product quality, and putative...
LegionellaDB - A Database on Legionella Outbreaks
Gonçalves, Inês G.; Fernandes, Henrique S.; Duarte Melo, Ana; Sousa, Sérgio F.; Simões, Lúcia Chaves; Simões, Manuel LopesLegionellaDB is the first database on Legionella outbreaks; it is based on a metadata analysis of peer-reviewed manuscripts from PubMed and SCOPUS. LegionellaDB is dynamic and extensible, allowing users to search for specific outbreaks, suggest additional information to be included after curation, visualize statistical representations on specific outbreaks, and download selected data. The database is maintained...
Bacterial coaggregation in aquatic systems
Afonso, Ana C.; Gomes, Inês B.; Saavedra, Maria José; Giaouris, Efstathios; Simões, Lúcia Chaves; Simões, Manuel LopesThe establishment of a sessile community is believed to occur in a sequence of steps where genetically distinct bacteria can become attached to partner cells via specific molecules, in a process known as coaggregation. The presence of bacteria with the ability to autoaggregate and coaggregate has been described for diverse aquatic systems, particularly freshwater, drinking water, wastewater, and marine water. I...
Biofilm control by ionic liquids
Simões, Manuel Lopes; Pereira, Ana Rita; Simões, Lúcia Chaves; Cagide, Fernando; Borges, FernandaIonic liquids (ILs) are remarkable chemical compounds with applications in many areas of modern science. They are increasingly recognized as promising compounds to fight microorganisms in both planktonic and biofilm states, contributing to reinvent the antimicrobial pipeline. Biofilm-related infections are particularly challenging given that the scientific community has not yet identified a reliable control str...
Influence of different copper materials on biofilm control using chlorine and m...
Gomes, Inês B.; Simões, Lúcia Chaves; Simões, Manuel LopesThe selection of materials for plumbing application has potential implications on the chemical and microbiological quality of the delivered water. This work aims to evaluate the action of materials with different copper content (0, 57, 96 and 100%) on biofilm formation and control by chlorination and mechanical stress. A strain of Stenotrophomonas maltophilia isolated from drinking water was used as model micro...
The effects of different biocides against selected drinking water-isolated bact...
Oliveira, Isabel Maria; Simões, Lúcia Chaves; Simões, Manuel LopesThe chemical disinfectant chlorine, as chlorine gas (Cl2) and sodium hypochlorite (NaOCl), has been commonly used for drinking water treatment.1,2 Although the recommended residual concentration of free chlorine allows to some extent the control of microbial growth in the bulk water, the occurrence of biofilms in chlorinated drinking water distribution systems (DWDS) has been frequently reported.3,4 Therefore, ...