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Tribological evaluation of hydrogels for artificial articular cartilage
Lopes, J. L.; Machado, J. M.; Castanheira, L.; Granja, P. L.; Gama, F. M.; Dourado, Fernando; Gomes, J. R.Bacterial cellulose (BC) is a natural and biocompatible gel with unique properties, such as high water holding capacity, ultra-fine fibre network and high strength that make it an interesting material for biotribological purposes. In this work, unmodified BC pellicles were grown from Gluconacetobacter xylinus in order to be used as tribological samples against bovine articular cartilage (BAC) in the presence of...
Friction and wear behaviour of bacterial cellulose against articular cartilage
Lopes, J. L.; Machado, J. M.; Castanheira, L.; Granja, P. L.; Gama, F. M.; Dourado, Fernando; Gomes, J. R.Bacterial cellulose (BC) is a natural and biocompatible material with unique properties, such as high water holding capacity, ultra-fine fibre network and high strength that makes it an attractive material for the repair of articular cartilage lesions. However, data on the tribological properties of BC is very scarce, particularly if natural articular cartilage is involved in the contact. In this work, unmodifi...
Staphylococcus epidermidis RP62A adhesion to chemically modified cellulose deri...
Fonseca, A. P.; Granja, P. L.; Nogueira, J. A.; Oliveira, Rosário; Barbosa, M. A.The adhesion of coagulase negative Staphylococcus epidermidis expressing capsular polysaccharide/adhesin (PS/A) to cellulose diacetate (CDA), as well as to primary reference low-density polyethylene, was assessed in vitro. Attached bacteria were released by gentle sonication and quantified as colony forming units. Surface free energy of cells and materials and the free energy of interaction between cells, each ...
Attachment of Staphylococcus epidermidis RP62A to chemically modified cellulose...
Fonseca, A. P.; Granja, P. L.; Nogueira, J. A.; Oliveira, Rosário; Barbosa, M. A.Coagulase negative staphylococci, most notably Staphylococcus epidermidis, have been identified as a predominant cause of cardiovascular implant infection, which begins with the colonization of the device by the bacteria. One possible approach to reduce this event is to understand how the physicochemical properties of bacterial surface influence attachment to biomaterials. In the present study, the attachment o...
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