The plasma-activated gas is capable of decontaminating surfaces of different materials in remote distances. The effect of plasma-activated water vapor on Staphylococcus epidermidis, methicillin-resistant Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli biofilm contamination was investigated on the polypropylene nonwoven textile surface. The robust and technically simple multi-hollow surface dielectric barrier discharge was used as a low-temperature atmospheric plasma source to activate the water-based medium. The germicidal efficiency of short and long-time exposure to plasma-activated water vapor was evaluated by standard microbiological cultivation and fluorescence analysis using a fluorescence multiwell plate reader. The test was repeated in different distances of the contaminated polypropylene nonwoven sample from the surface of the plasma source. The detection of reactive species in plasma-activated gas flow and condensed activated vapor, and thermal and electrical properties of the used plasma source, were measured. The bacterial biofilm decontamination efficiency increased with the exposure time and the plasma source power input. The log reduction of viable biofilm units decreased with the increasing distance from the dielectric surface.
- MeSH
- biofilmy účinky léků MeSH
- dekontaminace metody MeSH
- elektřina * MeSH
- Escherichia coli účinky léků MeSH
- methicilin rezistentní Staphylococcus aureus účinky léků MeSH
- mikrobiální viabilita MeSH
- plazmové plyny farmakologie MeSH
- Pseudomonas aeruginosa účinky léků MeSH
- Staphylococcus epidermidis účinky léků MeSH
- Publikační typ
- časopisecké články MeSH
Soft tissues are pseudoelastic anisotropic materials; various formulas for their strain energy density have been proposed for modelling of their constitutive behaviour. However, the individual variance of elastic parameters is often more pronounced than their anisotropy, so that their constitutive relations can be modelled as either isotropic or orthotropic. Any hyperelastic model requires more mechanical tests to be input for an identification of its parameters than mere uniaxial tension tests; especially biaxial tension tests are very important also for isotropic hyperelastic materials. A design of a testing rig produced in cooperation of our institute with some local companies is presented. It enables us to carry out not only equibiaxial tension tests, but also some other biaxial tensile tests, because displacements in both mutually perpendicular directions can be controlled independently. The proposal of various types of biaxial tests is presented in the paper, with examples of their realization with porcine aortic wall tissue. The contribution focuses on ways of evaluation of the results and on identification of parameters of various constitutive models. The use of more mechanical tests in identification of constitutive parameters can improve the predictive capability of the models substantially.
- MeSH
- arterie fyziologie MeSH
- biomechanika MeSH
- elastická tkáň fyziologie MeSH
- mechanický stres MeSH
- pevnost v tahu MeSH
- počítačová simulace MeSH
- pojivová tkáň fyziologie MeSH
- prasata MeSH
- pružnost MeSH
- statistické modely MeSH
- teoretické modely MeSH
- testování materiálů MeSH
- zobrazování trojrozměrné MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- hodnotící studie MeSH
