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2(5H)-Furanone: a prospective strategy for biofouling-control in membrane biofilm bacteria by quorum sensing inhibition BJM
Ponnusamy,Kannan; Paul,Diby; Kim,Young Sam; Kweon,Ji Hyang.
Biofouling of membranes demands costly periodic cleaning and membrane replacement. A sustainable and environmentally friendly solution for maintenance is not available and would be of great interest for many purposes including economical. As complex biofilm formation by environmental strains is the major cause of biofouling and biofilm formation in most cases are controlled by N-Acylhomoserine lactone (AHL)mediated Quorum Sensing (QS). An effort was made to understand the appropriateness of 2(5H)-furanone, to use against biofouling of membranes. QS inhibition activity by 2(5H)-furanone was studied using bioindicator strains and known AHLs of different acyl chain lengths. The biofilm inhibition was studied by growth analysis on polystyrene plate of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Furanone; Biofilm; Water treatment; Quorum sensing; N-Acyl homoserine lactone.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100032
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Adaptation of copper community tolerance levels after biofilm transplantation in an urban river ArchiMer
Fechner, Lise C.; Versace, Francois; Gourlay-france, Catherine; Tusseau-vuillemin, Marie-helene.
The Water Framework Directive requires the development of biological tools which can act as early-warning indicators of a sudden increase (accidental pollution) or decrease (recovery due to prevention) of the chemical status of aquatic systems. River biofilms, which respond quickly to modifications of environmental parameters and also play a key part in the functioning of aquatic ecosystems, are therefore good candidates to monitor an increase or a decrease of water pollution. In the present study, we investigated the biological response of biofilms transplanted either upstream (recovery) or downstream (deterioration of exposure levels) the urban area of Paris (France). Both modifications of Cu community tolerance levels and of global bacterial and...
Tipo: Text Palavras-chave: River; Biofilm; PICT; ARISA; Urban contamination; Transplantation.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00070/18129/16053.pdf
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Adhesion and biofilm formation by Staphylococcus aureus from food processing plants as affected by growth medium, surface type and incubation temperature BJPS
Jerônimo,Heloísa Maria Ângelo; Queiroga,Rita de Cássia Ramos do Egypto; Costa,Ana Caroliny Vieira da; Barbosa,Isabella de Medeiros; Conceição,Maria Lúcia da; Souza,Evandro Leite de.
This study assessed the effect of different growth media [BHI broth, BHI broth plus glucose (10 g/100 mL) and BHI broth plus NaCl (5 g/100 mL)] and incubation temperatures (28 or 37 ºC) on the adherence, detachment and biofilm formation on polypropylene and stainless steel surfaces (2 x 2 cm coupons) for a prolonged period (24-72 h) by some strains of Staphylococcus aureus (S3, S28 and S54) from food processing plants. The efficacy of the sanitizers sodium hypochlorite (250 mg/mL) and peracetic acid (30 mg/mL) in reducing the number of viable bacterial cells in a preformed biofilm was also evaluated. S. aureus strains adhered in highest numbers in BHI broth, regardless of the type of surface or incubation temperature. Cell detachment from surfaces revealed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Staphylococcus aureus/food processing; Biofilm; Surfaces; Sanitizers/efficacy.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502012000400018
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Adhesion, biofilm and genotypic characteristics of antimicrobial resistant Escherichia coli isolates BJM
Cergole-Novella,Maria C.; Pignatari,Antonio C.C.; Guth,Beatriz E.C..
Aggregative adherence to human epithelial cells, most to renal proximal tubular (HK-2) cells, and biofilm formation was identified among antimicrobial resistant Escherichia coli strains mainly isolated from bacteremia. The importance of these virulence properties contributing to host colonization and infection associated with multiresistant E. coli should not be neglected.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adherence; Biofilm; Extraintestinal Escherichia coli; Antimicrobial resistance; Virulence genes.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100167
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An association between milk and slime increases biofilm production by bovine Staphylococcus aureus. Repositório Alice
FABRES-KLEIN, M. H.; SANTOS, M. J. C.; KLEIN, R. C.; SOUZA, G. N. de; RIBON, A. de O. B..
2015
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Staphylococcus aureus; Biofilm; Slime; Skim-milk medium; Agr type.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1037104
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Analysis of the in vitro adherence of Streptococcus mutans and Candida albicans BJM
Barbieri,Dicler de Sant'Anna Vitor; Vicente,Vânia Aparecida; Fraiz,Fabian Calixto; Lavoranti,Osmir José; Svidzinski,Terezinha Inês Estivalet; Pinheiro,Rosângela Lameira.
The objective of the present study was to investigate the in vitro adherence capacity of Streptococcus mutans and Candida albicans. Adherence assays were conducted on dental surfaces and analyzed by scanning electron microscopy (SEM). Extracted human teeth were inoculated with Streptococcus mutans or Candida albicans and with both species simultaneously, and incubated at 37ºC for 21 days. Bacterial inocula had been obtained from saliva samples of children that had been colonized by both organisms. ATCC reference strains were used as controls. SEM analyses showed that the biofilm that covered the entire analyzed dental surface was more homogeneous inoculated with the two microorganisms simultaneously than with each species separately. In a second...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adherence; Candida albicans; Streptococcus mutans; Biofilm.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822007000400009
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Anti-Bacterial Activity of Phenolic Compounds against Streptococcus pyogenes ArchiMer
Macé, Sabrina; Truelstrup Hansen, Lisbeth; Rupasinghe, H. P. Vasantha.
Background: Worldwide, Streptococcus pyogenes is the leading cause of bacterial pharyngitis. To reduce the use of antibiotics, antimicrobial phytochemical-containing remedies, which have long been in use in traditional medicine, may provide new approaches for management of streptococcal pharyngitis. The objective of this study was to assess the inhibitory activities of 25 natural phenolic compounds against three strains of S. pyogenes. Methods: After an initial screening, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of the nine most effective phenolic compounds were determined. The effect of four compounds with the lowest MIC and MBC on streptococcal growth and biofilm formation was also studied. Results:...
Tipo: Text Palavras-chave: Pharyngitis; Strep throat; Biofilm; Naphthoquinone; Infection; Disease; Polyphenols.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00603/71515/69934.pdf
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Antibacterial and antibiofilm activity of carvacrol against Salmonella enterica serotype Typhimurium BJPS
Trevisan,Daliah Alves Coelho; Silva,Alex Fiori da; Negri,Melyssa; Abreu Filho,Benício Alves de; Machinski Junior,Miguel; Patussi,Eliana Valéria; Campanerut-Sá,Paula Aline Zanetti; Mikcha,Jane Martha Graton.
ABSTRACT The present study evaluated the antibacterial and antibiofilm activity of carvacrol against Salmonella Typhimurium. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined and the time-kill curve and scanning electron microscopy (SEM) were performed to evaluate antibacterial activity. Antibiofilm activity was evaluated by quantifying total biomass using crystal violet assay, and metabolic activity was determined using MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay. The action of carvacrol against preformed biofilm on polypropylene and stainless steel was also evaluated by colony counting and SEM. The MIC and MBC was 312 µg mL-1. Carvacrol at MIC and 2 x MIC eliminated cells...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carvacrol; Biofilm; Antibacterial activity; Salmonella Typhimurium..
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502018000100612
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Antibacterial and anti-biofilm activity of cinnamon essential oil and eugenol Ciência Rural
Millezi,Alessandra Farias; Costa,Karine Angélica Dalla; Oliveira,José Maria; Lopes,Susana Patrícia; Pereira,Maria Olívia; Piccoli,Roberta Hilsdorf.
ABSTRACT: Biofilms are responsible for most of the interference caused by microorganisms in food processing. The aim of this study was to evaluate the cinnamon (Cinnamomum zeylanicum) essential oil and eugenol sanitizer and anti-biofilm activity against biofilms. Concentrations used of essential oil were 0.0% (control) 0.12%; 0.48%; 0.96% and 1.92%; the amount of eugenol was 0.76%. Concentrations were determined from other published studies. Number of viable cells and quantification the bacterial biomass were determined. Anti-biofilm treatment was effective in preventing the formation of biofilms. The 1.92% concentration was the most satisfactorily with Escherichia coli reduction of 5.91log CFUcm-2 and Staphylococcus aureus reduction of 5.17log CFUcm-2...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biofilm; Antimicrobial natural; Food processing.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000100452
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Antimicrobial susceptibility of hospital acquired Stenotrophomonas maltophilia isolate biofilms BJID
Sun,Erlin; Liang,Gehong; Wang,Lining; Wei,Wenjie; Lei,Mingde; Song,Shiduo; Han,Ruifa; Wang,Yubao; Qi,Wei.
Abstract Aims We sought to characterize the antibiotic susceptibility of strains of Stenotrophomonas maltophilia isolated from clinical samples, and the role of Stenotrophomonas maltophilia biofilm in antibiotic resistance. Methods Fifty-one clinical Stenotrophomonas maltophilia isolates were obtained from patients with nosocomial infection in the surgical wards and ICUs of six general hospitals in Tianjin, China. In vitro models of Stenotrophomonas maltophilia biofilms were established and confirmed by scanning electron microscopy and fluorescence microscopy with silver staining. The minimal inhibitory concentrations and biofilm inhibitory concentrations of commonly used antibiotics were determined. Results 47 of 51 strains were resistant to three or...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stenotrophomonas maltophilia; Biofilm; Antibiotic resistance; Nosocomial.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000400365
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Bacterial biofilms with emphasis on coagulase-negative staphylococci J. Venom. Anim. Toxins incl. Trop. Dis.
Oliveira,A; Cunha,MLRS.
In addition to their capacity to attach to surfaces, various groups of microorganisms also produce an extracellular polymeric substance known as "slime". This slime forms a thin layer around cells known as biofilm. Thus, biofilm structure comprises bacterial cells and an extracellular polymeric substance. It also presents a defined architecture, providing the microorganisms with an excellent protective environment and favoring the exchange of genetic material between cells as well as intercellular communication. The ability to produce biofilm is observed in a large group of bacteria, including coagulase-negative staphylococci (CNS) which are the predominant microorganisms of normal skin flora and have been implicated as the causative agents of hospital...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coagulase-negative staphylococci; Biofilm; Slime; Infection; Microbiology.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992008000400003
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Bacterial community structure of the marine diatom Haslea ostrearia ArchiMer
Lepinay, Alexandra; Capiaux, Herve; Turpin, Vincent; Mondeguer, Florence; Lebeau, Thierry.
Haslea ostrearia produces a water-soluble, blue-green pigment, called marennine, with proven economic benefits (as a bioactive compound used to green oysters, which improves their market value). Incomplete knowledge of the ecological features of this marine diatom complicates its cultivation. More specifically, the ecology of bacteria surrounding H. ostrearia in ponds is what remains unknown. The structure of this bacterial community was previously analyzed by means of PCR-TTGE before and after isolating H. ostrearia cells recovered from 4 localities in order to distinguish the relative parts of the biotope and biocenose and to describe the temporal dynamics of the bacterial community structure at two time scales (2 weeks vs. 9 months). The bacterial...
Tipo: Text Palavras-chave: Biofilm; Ecology; Metabolic fingerprinting; Microalgae; Phycosphere; TTGE.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00326/43737/43344.pdf
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Bacterial exopolysaccharide and biofilm formation stimulate chickpea growth and soil aggregation under salt stress BJM
Qurashi,Aisha Waheed; Sabri,Anjum Nasim.
To compensate for stress imposed by salinity, biofilm formation and exopolysaccharide production are significant strategies of salt tolerant bacteria to assist metabolism. We hypothesized that two previously isolated salt-tolerant strains Halomonas variabilis (HT1) and Planococcus rifietoensis (RT4) have an ability to improve plant growth, These strains can form biofilm and accumulate exopolysacharides at increasing salt stress. These results showed that bacteria might be involved in developing microbial communities under salt stress and helpful in colonizing of bacterial strains to plant roots and soil particles. Eventually, it can add to the plant growth and soil structure. We investigated the comparative effect of exopolysacharide and biofilm formation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biofilm; Cicer arietinum; Exopolysaccharide; Salinity; Soil aggregates.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000300046
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Biofilm formation and acyl homoserine lactone production in Hafnia alvei isolated from raw milk Biol. Res.
SOUZA VIANA,ELISETH; MARTINO CAMPOS,MARIA EMILENE; REIS PONCE,ADRIANA; CUQUETTO MANTOVANI,HILÁRIO; DANTAS VANETTI,MARIA CRISTINA.
The objective of this study was to detect the presence of acyl homoserine lactones (AHLs), signal molecules of the quorum sensing system in biofilm formed by Hafnia alvei strains. It also evaluated the effect of synthetic quorum sensing inhibitors in biofilm formation. AHLs were assayed using well diffusion techniques, thin layer chromatography (TLC) and detection directly in biofilm with biomonitors. The extracts obtained from planktonic and sessile cell of H. alvei induced at least two of three monitor strains evaluated. The presence of AHLs with up to six carbon atoms was confirmed by TLC. Biofilm formation by H. alvei was inhibited by furanone, as demonstrated by 96-well assay of crystal violet in microtitre plates and by scanning electron microscopy....
Tipo: Journal article Palavras-chave: Acyl homoserines lactones; Biofilm; Furanones; Quorum sensing.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400004
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Biofilm formation by Listeria monocytogenes on stainless steel surface and biotransfer potential BJM
Oliveira,Maíra Maciel Mattos de; Brugnera,Danilo Florisvaldo; Alves,Eduardo; Piccoli,Roberta Hilsdorf.
An experimental model was proposed to study biofilm formation by Listeria monocytogenes ATCC 19117 on AISI 304 (#4) stainless steel surface and biotransfer potential during this process. In this model, biofilm formation was conducted on the surface of stainless steel coupons, set on a stainless steel base with 4 divisions, each one supporting 21 coupons. Trypic Soy Broth was used as bacterial growth substrate, with incubation at 37 ºC and stirring of 50 rpm. The number of adhered cells was determined after 3, 48, 96, 144, 192 and 240 hours of biofilm formation and biotransfer potential from 96 hours. Stainless steel coupons were submitted to Scanning Electron Microscopy (SEM) after 3, 144 and 240 hours. Based on the number of adhered cells and SEM, it was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Listeria monocytogenes; Biofilm; Biotransfer potential.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100016
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Biofilm formation by Staphylococcus aureus from food contact surfaces in a meat-based broth and sensitivity to sanitizers BJM
Souza,Evandro Leite de; Meira,Quênia Gramile Silva; Barbosa,Isabella de Medeiros; Athayde,Ana Júlia Alves Aguiar; Conceição,Maria Lúcia da; Siqueira Júnior,José Pinto de.
This study assessed the capacity of adhesion, the detachment kinetic and the biofilm formation by Staphylococcus aureus isolated from food services on stainless steel and polypropylene surfaces (2 x 2 cm) when cultivated in a meat-based broth at 28 and 7 ºC. It was also to study the efficacy of the sanitizers sodium hypochlorite (250 mg/L) and peracetic acid (30 mg/L) in inactivating the bacterial cells in the preformed biofilm. S. aureus strains adhered in high numbers regardless the assayed surface kind and incubation temperature over 72 h. Cells detachment of surfaces revealed high persistence over the incubation period. Number of cells needed for biofilm formation was noted at all experimental systems already after 3 days. Peracetic acid and sodium...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Staphylococcus aureus; Food processing environment; Cross-contamination; Biofilm; Sanitizers.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000100010
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Biofilm formation on polystyrene under different temperatures by antibiotic resistant Enterococcus faecalis and Enterococcus faecium isolated from food BJM
Marinho,A.R.; Martins,P.D.; Ditmer,E.M.; d'Azevedo,P.A.; Frazzon,J.; Sand,S.T.Van Der; Frazzon,A.P.G..
The ability of antibiotic resistant E. faecalis and E. faecium isolated from food to form biofilm at different temperatures in the absence or presence of 0.75% glucose was evaluated. A synergistic effect on biofilm at 10 °C, 28 °C, 37 °C and 45 °C and glucose was observed for E. faecalis and E. faecium.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Enterococci; Resistant; Food; Temperatures; Biofilm; Polystyrene.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000200012
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Biofilm production and beta-lactamic resistance in Brazilian Staphylococcus aureus isolates from bovine mastitis BJM
Marques,Viviane Figueira; Motta,Cássia Couto da; Soares,Bianca da Silva; Melo,Dayanne Araújo de; Coelho,Shana de Mattos de Oliveira; Coelho,Irene da Silva; Barbosa,Helene Santos; Souza,Miliane Moreira Soares de.
Abstract Staphylococcus spp. play an important role in the etiology of bovine mastitis. Staphylococcus aureus is considered the most relevant species due to the production of virulence factors such as slime, which is required for biofilm formation. This study aimed to evaluate biofilm production and its possible relation to beta-lactamic resistance in 20 S. aureus isolates from bovine mastitic milk. The isolates were characterized by pheno-genotypic and MALDI TOF-MS assays and tested for genes such as icaA, icaD, bap, agr RNAIII, agr I, agr II, agr III, and agr IV, which are related to slime production and its regulation. Biofilm production in microplates was evaluated considering the intervals determined along the bacterial growth curve. In addition, to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biofilm; Agr types; Antimicrobial resistance; Mastitis.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000100118
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Biofilm production by clinical isolates of Pseudomonas aeruginosa and structural changes in LasR protein of isolates non biofilm-producing BJID
Lima,Jailton Lobo da Costa; Alves,Lilian Rodrigues; Jacomé,Paula Regina Luna de Araújo; Bezerra Neto,João Pacífico; Maciel,Maria Amélia Vieira; Morais,Marcia Maria Camargo de.
ABSTRACT Introduction: Biofilm production is an important mechanism for the survival of Pseudomonas aeruginosa and its relationship with antimicrobial resistance represents a challenge for patient therapeutics. P. aeruginosa is an opportunistic pathogen frequently associated to nosocomial infections, especially in imunocompromised hosts. Objectives: Analyze the phenotypic biofilm production in P. aeruginosa isolates, describe clonal profiles, and analyze quorum sensing (QS) genes and the occurrence of mutations in the LasR protein of non-biofilm producing isolates. Methods: Isolates were tested for biofilm production by measuring cells adherence to the microtiter plates. Clonal profile analysis was carried out through ERIC-PCR, QS genes were by specific...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pseudomonas aeruginosa; Biofilm; Multiresistance; Quorum sensing (QS).
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702018000200129
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Biofilm production by clinical Staphylococci strains from canine otitis BJM
Moreira,Camila Alencar; Oliveira,Lis Christina de; Mendes,Marina Silveira; Santiago,Thiago de Melo; Barros,Eduardo Bedê; Carvalho,Cibele Barreto Mano de.
This study determined the species of 54 staphylococci isolates from canine otitis and their ability to produce biofilm through the Congo red agar method, confirmed by scanning electron microscopy. The most frequently identified species were S. intermedius and S. simulans. Results showed that 30% of the strains were biofilm producers.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biofilm; Congo red agar; Scanning electronic microscopy; Canine otitis.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100044
Registros recuperados: 108
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