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| Registros recuperados: 19 | |
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| Brandão,Ildnay de Souza Lima; Oliveira-Moraes,Heloiza Maria da Silva; Motta,Cristina Maria de Souza; Oliveira,Neiva Tinti de; Magalhães,Oliane Maria Correia. |
| Abstract Aspergillus fumigatus is an opportunistic saprobe fungus that accounts for 90% of cases of pulmonary aspergillosis in immunosuppressed patients and is known for its angiotropism. When it reaches the respiratory tract, A. fumigatus interacts with structural components and blood vessels of the lungs, such as elastin. To understand the effect of this structural component, we examined the effect of elastin on the production and development of the biofilm of A. fumigatus. In RPMI containing 10 mg/mL of elastin, a significant increase (absorbance p < 0.0001; dry weight p < 0.0001) in the production of biofilm was observed in comparison to when RPMI was used alone, reaching a maximum growth of 18.8 mg (dry weight) of biofilm in 72 h. In addition,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aspergillus fumigatus; Biofilm; Elastin; Extracellular matrix; Hydrophobicity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000300675 |
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| Dzubiella,Joachim. |
| Water at normal conditions is a fluid thermodynamically close to the liquid-vapor phase coexistence and features a large surface tension. This combination can lead to interesting capillary phenomena on microscopic scales. Explicit water molecular dynamics (MD) computer simulations of hydrophobic solutes, for instance, give evidence of capillary evaporation on nanometer scales, i.e., the formation of nanometer-sized vapor bubbles (nanobubbles) between confining hydrophobic surfaces. This phenomenon has been exemplified for solutes with varying complexity, e.g., paraffin plates, coarse-grained homopolymers, biological and solid-state channels, and atomistically resolved proteins. It has been argued that nanobubbles strongly impact interactions in nanofluidic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solvation; Hydrophobicity; Nanobubbles; Implicit water model; Molecular dynamics simulations. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100002 |
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| Zeraik,Ana Eliza; Nitschke,Marcia. |
| Bacterial adhesion to inert surfaces is a complex process influenced by environmental conditions. In this work, the influence of growth medium and temperature on the adhesion of Pseudomonas aeruginosa, Serratia marcescens, Staphylococcus aureus, Micrococcus luteus and Listeria monocytogenes to polystyrene surfaces was studied. Most bacteria demonstrated the highest adhesion when cultured in TSYEA, except S. marcescens, which showed to be positively influenced by the pigment production, favored in poor nutrient media (lactose and peptone agar). P. aeruginosa adhesion to polystyrene increased at low temperatures whatever the medium used. The culture medium influenced the surface properties of the bacteria as assessed by the MATS test. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial adhesion; Biofilms; Hydrophobicity; Polystyrene. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000400012 |
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| Okamoto,Ana C.; Gaetti-Jardim Jr.,Elerson; Arana-Chavez,Victor E.; Avila-Campos,Mario J.. |
| Fusobacterium nucleatum is considered a bridge organism between earlier and later colonizers in dental biofilms and a putative periodontopathogen. In Dentistry, antimicrobial agents are used for treatment and control of infectious diseases associated with dental plaque. Antiseptics have been used in association with antibiotics to reduce infections after oral surgeries. In this study, the influence of subinhibitory concentrations (SC) of chlorhexidine, triclosan, penicillin G and metronidazole, on hydrophobicity, adherence to oral epithelial cells, and ultra-structure of F. nucleatum was examined. All isolates were susceptible to chlorhexidine, triclosan, and metronidazole; however, most of the isolates were susceptible to penicillin G, and all of them... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fusobacterium nucleatum; Hydrophobicity; Adherence; Antimicrobial; Ultra-structure. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000200017 |
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| Kim,Yun-mi; Farrah,Samuel; Baney,Ronald H. |
| Antimicrobial action of silanols, a new class of antimicrobials, was investigated by transmission electron microscopy and fluorescent dye studies. Gram-negative bacteria, Escherichia coli and Pseudomonas aeruginosa and Gram-positive bacteria, Staphylococcus aureus and Enterococcus faecalis were treated by silanols at concentration of less than 0.2 wt% for one hour. Membrane damage of the bacteria by the silanol treatment was clearly observed by transmission electron microscopy. Separation of the cytoplasmic membrane from the outer membrane for E. coli and disorganized cytoplasmic membrane of the Gram-positive bacteria were observed when compared to the control. Fluorescent dyes, green-fluorescent nucleic acid stain (Syto 9) and the red-fluorescent nucleic... |
| Tipo: Journal article |
Palavras-chave: Antimicrobials; Hydrophobicity; Organosilicon compounds. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200009 |
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| Alves,Roberta Barbosa Teodoro; Andrade,Nélio José de; Fontes,Edimar Aparecida Filomeno; Bernardes,Patrícia Campos; Carvalho,Antônio Fernandes de. |
| ABSTRACT The objective of this study was to evaluate the quality of water purification system and identify the bacteria this system, predict bacterial adherence according to the hydrophobicity of these microorganisms and of the polypropylene distribution loop for purified water. The assessment of drinking water that supplies the purification system allowed good-quality physical, chemical, and microbiological specifications. The physicochemical specifications of the distributed purified water were approved, but the heterotrophic bacteria count was higher than allowed (>2 log CFU mL-1).The sanitation of the storage tank with chlorine decreased the number of bacteria adhered to the surface (4.34 cycles log). By sequencing of the 16SrDNA genes, six species... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Purified water/quality; Purified water/adhesion; Purified water/bacterial biodiversity; Prediction thermodynamics; Hydrophobicity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502017000200606 |
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| Gandia,Rômulo M.; Corrêa,Andrea A. R.; Gomes,Francisco C.; Marin,Diego B.; Santana,Lucas S.. |
| ABSTRACT Adobe is an efficient construction material for several reasons, such as its thermal comfort, sustainability, and lower energy cost, as well as the simplicity of its production and execution. However, challenges such as water absorption, capillarity, and compressive strength should be investigated to improve its physical and mechanical properties. “Synthetic termite saliva” (STS) is an excellent stabilizer with high cohesive and hydrophobic power. Therefore, the objective of this work was to evaluate the effects of STS incorporation into adobe, analyzing its physical, mechanical and thermal properties. Five treatments were studied: 0 (control); 0.1; 0.2; 0.4 and 0.8% STS by mass. These adobe samples were evaluated according to bulk density, linear... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nonconventional materials; Stabilization; Sustainability; Earth construction; Hydrophobicity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000200139 |
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| Lima,J.C.; Andrade,N.J.; Soares,N.F.F.; Ferreira,S.O.; Fernandes,P.E.; Carvalho,C.C.P.; Lopes,J.P.; Martins,J.F.L. |
| In this study, we examined the physiochemical properties of nasoenteral feeding tubes made from two different types of polymer: silicone materials and polyurethane. The internal surfaces of the nasoenteral feeding tubes were analyzed for their hydrophobicity, roughness, microtopography, rupture-tension and ability to stretch. We also studied the adhesion of an isolated, multi-drug resistant strain of S. aureus to these polymers. The polyurethane nasoenteral tube, which was classified as hydrophilic, was more resistant to rupture-tension and stretching tests than the silicone tube, which was classified as hydrophobic. Additionally, the polyurethane tube had a rougher surface than the silicone tube. Approximately 1.0 log CFU.cm-2 of S. aureus cells adhered... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Staphylococcus aureus adhesion; Nasoenteral tubes; Hydrophobicity; Roughness and mechanical resistance. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000200013 |
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| Hamadi,Fatima; Latrache,Hassan; Zahir,Hafida; Elghmari,Abderrahmene; Timinouni,Mohamed; Ellouali,Mostapha. |
| Escherichia coli surface characteristics including hydrophobicity, electrophoretic mobility and surface functional groups' composition were investigated. These characteristics were determined respectively by water contact angle measurements, microelectrophoresis and x-ray photoelectron spectroscopy (XPS). The relation between the physicochemical properties and functional groups' composition was also examined. The electrophoretic mobility at pH 7 appeared to be governed on the cell surface by the (O=C) functional groups. The cell surface's hydrophilicity was associated with high levels of (C-(O.N)) and (OH-(C-O-C)) functional groups, whereas the cell surface's hydrophobicity was associated with (C-(C,H)) functional groups. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Escherichia coli; Surface functional groups; Hydrophobicity; Electrophoretic mobility. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000100003 |
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| Bernardes,Patrícia Campos; Araújo,Emiliane Andrade; Pires,Ana Clarissa dos Santos; Fialho Júnior,José Felício Queiroz; Lelis,Carini Aparecida; Andrade,Nélio José de. |
| The adhesion of the solids presents in food can difficult the process of surface cleaning and promotes the bacterial adhesion process and can trigger health problems. In our study, we used UHT whole milk, chocolate based milk and infant formula to evaluate the adhesion of Enterobacter sakazakii on stainless steel coupons, and we determine the work of adhesion by measuring the contact angle as well as measured the interfacial tension of the samples. Inaddition we evaluated the hydrophobicity of stainless steel after pre-conditioning with milk samples mentioned. E. sakazakii was able to adhere to stainless steel in large numbers in the presence of dairy products. The chocolate based milk obtained the lower contact angle with stainless steel surface, higher... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Enterobacter sakazakii; Hydrophobicity; Adhesion work; Interfacial tension; Dairy products. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000400004 |
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| Registros recuperados: 19 | |
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