File Name: bacterial adhesion to animal cells and tissues .zip
Metrics details. Processing of fresh produce exposes cut surfaces of plant cell walls that then become vulnerable to human foodborne pathogen attachment and contamination, particularly by Salmonella enterica. Plant cell walls are mainly composed of the polysaccharides cellulose, pectin and hemicelluloses predominantly xyloglucan.
Rather, microorganisms have been shown to naturally accumulate on a wide variety of surfaces; where they form sessile, sedentary communities. Those surfaces include household and industrial pipes, biomaterials such as contact lenses, medical devices including implants and urinary catheters, as well as plant and animal tissues. These accumulations of microorganisms of mono- or poly-microbial aggregates are commonly referred to as a biofilm and can consist of diverse communities of bacteria and fungi. The close proximity of the microorganisms enables substrate exchange, distribution of metabolic products and removal of toxic end products so that the different species can support each other. Moreover, the structure of biofilm communities can protect the bacteria within them from attack by antimicrobials, shear forces and the immune system. An example biofilm of two bacterial species Pseudomonas aeruginosa and Staphylococcus epidermidis is shown in Figure 1.
The integrity of tissues is also dependent on the adhesion, by CAMs, of cells to cells and cells to the Extracellular Matrix. Extracellular matrix ECM All cells in solid tissue are surrounded by extracellular matrix. Both plants and animals have ECM. The cell wall of plant cells is a type of extracellular matrix. Cells in animals are also linked directly to each other by cell adhesion molecules CAMs at the cell surface. ECM is composed of proteins and polysaccharides.
The pig was chosen as an animal model of endophthalmitis, after a bibliographical analysis and a personal study of its aqueous humor composition. Crystalline lenses from 90 domestic pigs were removed aseptically and replaced with previously infected IOLs. The animals were killed 24 hours, 72 hours, and 1 week after implantation of the IOLs. The extent of bacterial binding was then measured by counting. The extent of bacterial binding expressed as bound bacteria per area unit was found to range in increasing order from hydrogel, to fluorine PMMA, to hydrophobic acrylic, to heparinized PMMA, to silicone polymer. Comparison of pairs of materials showed statistically significant differences, except between hydrogel and fluorine PMMA.
In biology , the extracellular matrix ECM is a three-dimensional network consisting of extracellular macromolecules and minerals, such as collagen , enzymes , glycoproteins and hydroxyapatite that provide structural and biochemical support to surrounding cells. The animal extracellular matrix includes the interstitial matrix and the basement membrane. Gels of polysaccharides and fibrous proteins fill the interstitial space and act as a compression buffer against the stress placed on the ECM. Each type of connective tissue in animals has a type of ECM: collagen fibers and bone mineral comprise the ECM of bone tissue ; reticular fibers and ground substance comprise the ECM of loose connective tissue ; and blood plasma is the ECM of blood. The plant ECM includes cell wall components, like cellulose, in addition to more complex signaling molecules.
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Attachment to host cells or tissues is often the first step in the establishment of bacterial PDF · Principles of Bacterial Adhesion. Itzhak Ofek, Ronald J. Doyle. Pages PDF Animal Cell Membranes as Substrata for Bacterial Adhesion.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Ofek and D.
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About this book. "Understanding of the critical events in the development of bacterial infections. Covers historical perspectives, general principles.Reply