Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"cell surface hydrophobicity"”.
-
Studies on the mechanism of zinc pyrithione resistance in Pseudomonas aeruginosa PAO1
… of biocide-sensitive and biocide-resistant cells, SDS-PAGE LPS analysis,changes in cell surface hydrophobicity, cross resistance, multiple antibiotic resistance, efflux systems and stress response.<br/><br/>Results indicate that the ZnPT-resistant phenotype exhibited an increase in cell …
-
Studies on the outer membrane of Pseudomonas aeruginosa and associated resistance properties
… agent and an increase in negativity of the cell surface charge were observed as cells became more resistant to BKC. In strain OO14 a decrease in whole cell phosphatidylcholine content, a decrease in binding/uptake of BKC and an increase in cell surface hydrophobicity were observed as cells …
-
Biofilm Formation by Common Dairy Sporeformers on Native and Modified Stainless Steel Surfaces
… also actively attach to the stainless steel surfaces, consequently resulting in the formation of biofilms. Product quality as well as its safety is undesirably affected by the growth of these sporeforming bacteria. Therefore, creating an ideal environment for the processing of dairy products …
-
A quantitative study of the relationships between morphology, physiology and geldanamycin synthesis in submerged cultures of Streptomyces hygroscopicus var. geldanus
… or calcium was demonstrated to alter the cell surface hydrophobicity of the organism, provoking dispersion or aggregation of cells respectively, and stimulating great disparity in geldanamycin yields. Indeed, in all instances, morphology was found to impact considerably on secondary …
-
Evaluation of the antimicrobial activity of Plectranthus amboinicus leaf extracts on planktonic and biofilm forms of Staphylococcus aureus and Pseudomonas aeruginosa
… In addition, the extracts were observed to alter cell surface hydrophobicity in both pathogens. Furthermore, as the concentration of Indian Borage extracts increased, the cell viability of HeLa cells decreased, indicating a concentration-dependent cytotoxic effect. This study was the first to …
-
Isolation and characterisation of bifidobacteria populations in infants in the Khomas region, Namibia
… strains. Using the well diffusion method, cell free supernatant (CFS) exhibited a high degree of antimicrobial activity against Listeria monocytogenes ATCC 13932, Candida albicans ATCC 13932, Escherichia coli ATCC 25922, Enterobacter aerogenes ATCC 13048, Salmonella typhi ATCC 13311, …
-
Role of Exopolymeric Substances in Biofilm Formation on Dairy Separation Membranes
… </em>membranes. This was associated to the cell-surface hydrophobicity of the strains, which was affected by the EPS production. In the second study a greater biofilm formation was observed for a <em>Bacillus </em>strain that produced poly glutamic acid, and it was established that …
-
A Study of Rhamnolipid Microbubble Dispersion for Bioremediation Applications
… a model NAPLcontaminant on the microbubble surface. The LW-AB surface thermodynamic model was applied to quantify the interaction energy to better understand the bacteria/microbubble and bacteria/contaminant/microbubble interactions. The findings of the characterisation studies support that …
-
Effect of environmental stress on the ability of Listeria monocytogenes Scott A to attach to food contact surfaces
… and pH were investigated. Numbers of attached cells increased with increasing attachment temperatures (10° to 45°C) and time (up to 120 min) for both Buna-N rubber and stainless steel. Cells attached at higher levels on stainless steel at all temperature and pH levels investigated. Rate of …
-
Role of Lactic Acid Bacteria as a Bio-sanitizer to Prevent Attachment of Listeria Monocytogenes on Deli Slicer Contact Surfaces, and the Influence of Listeria Innocua on the Attachment of L. Monocytogenes on Selected Materials Located in the Food-processing Environment
… monocytogenes </em> to survive on food contact surfaces after cleaning and disinfection. The current study explored the attachment of three lactic acid bacteria (LAB) strains, <em> Lactobacillus animalis </em> , <em> Lb. amylovorus</em> and <em> Pediococcus acidilactici </em>, their combination …
-
Characterization and encapsulation of probiotic bacteria using a Pea-protein Alginate matrix
… ranking of probiotic adherence to Caco-2 cells was determined to be: L. acidophilus > B. catenulatum > B. adolescentis > B. infantis, which correlated with 4.5 104, 3.1 103, 2.6 101, and 1.5 101 cfu/mL associated with Caco-2 cell monolayers, respectively. The most hydrophobic probiotics …
-
Detergent effects on disinfectant susceptibility of Escherichia coli and listeria monocytogenes attached to stainless steel
… procedures. E. coli attached to stainless steel surfaces became significantly more susceptible to benzalkonium chloride (BAC) after treatment with sodium alkyl sulphate (SAS) by 0.51 Log10 cfu ml-1 and fatty alcohol ethoxylate (FAE) by 0.96 Log10 cfu ml-1. No change in susceptibility was observed …
-
Studies on T-OMP and the development of antimicrobial tolerance in <i>Pseudomonas aeruginosa</i> PAO1
… is related to the nature of the Gram-negative cell envelope and in particular, the outer membrane. The outer membrane plays an important role in excluding harmful molecules from the cell, whilst being selectively permeable to other solutes via its implanted proteins (outer membrane proteins or …
-
Elucidating mechanisms of toxicity and engineering Escherichia coli for tolerance of short chain fatty acids
… membrane leakage, membrane lipid analysis, hydrophobicity, carboxylic acid production, transcriptome analysis, intracellular pH, γ-amino butyric acid determination, proton motive force simulation, genome reverse engineering, and biocatalyst zeta potential. These methods allow greater insight …