1571. Antibacterial effect of polymethyl methacrylate resin base containing TiO2 nanoparticlesAnamarija Zore, Anže Abram, Aleksander Učakar, Ivo Godina, Franc Rojko, Roman Štukelj, Andrijana Sever Škapin, Rajko Vidrih, Olivera Dolić, Valentina Veselinović, Klemen Bohinc, 2022, izvirni znanstveni članek Povzetek: Restorations in dentistry must reproduce the aspect of the patient’s natural teeth and require non-toxicity, biocompatibility, and good mechanical properties in order to last longer. Restorations are permanently in contact with microbes that can adhere to and form biofilms. The purpose of this study was to determine the adhesion extent of Streptococcus mutans to polymethyl methacrylate (PMMA) resin base containing TiO2 nanoparticles. To understand the adhesion of Streptococcus mutans on the modified resin-based surfaces, the following surface properties were measured: the roughness, contact angle, zeta potential and CIE color parameters. Evaluation of tensile stress performance in TiO2 modified PMMA showed that the maximum tensile stress of the modified PMMA resin decreases with an increasing amount of TiO2 nanoparticles. The increasing amount of TiO2 decreases the roughness and causes contact angles in the border between hydrophilic and hydrophobic surfaces. All the studied surfaces are negatively charged and added TiO2 tends to increase the zeta potential. The addition of TiO2 nanoparticles increases the lightness and decreases the intensity of the red and yellow color. The increasing addition of TiO2 nanoparticles into PMMA increases the morphological change of bacterial cells.
Ključne besede: bacterial adhesion, Streptococcus mutans, polymethyl methacrylate resin, TiO2, surface properties
Objavljeno v DiRROS: 20.12.2023; Ogledov: 277; Prenosov: 144
 Celotno besedilo (14,32 MB)
Gradivo ima več datotek! Več... |
1572. Efficiency of a corrosion inhibitor on bare, oxidized and real archeological bronze in indoor polluted atmosphere - digital image correlation approachTadeja Kosec, Polonca Ropret, 2021, izvirni znanstveni članek Povzetek: A corrosion inhibitor, tolyl methyl imidazole (TMI), was tested in practice and verified in a polluted in-door atmosphere. Special attention was given to its behavior in indoor storage conditions, where volatileorganic pollutants may cause damage to metal artefacts. Prepared samples of bronze and oxidized bronzewere exposed to acetic acid vapors. Raman analysis showed copper acetate and copper nitrate forma-tion. Suppression of corrosion development following the application of tolyl methyl imidazole (TMI) wasobserved. A simple method based on image analysis for corrosion evaluation was specifically developed.The TMI inhibition action was tested on a Roman archeological object and evaluated after exposure toindoor pollutants.
Ključne besede: bronze, inhibitor, corrosion, Raman
Objavljeno v DiRROS: 20.12.2023; Ogledov: 314; Prenosov: 168
Celotno besedilo (2,09 MB)
Gradivo ima več datotek! Več... |
1573. Analysis of loading profile effect on testing machine calibration resultsMiha Hiti, 2021, izvirni znanstveni članek Povzetek: The paper presents an evaluation of the loading profile effect on the testing machine calibration. First, a 20 kN force transducer was calibrated in a force calibration machine. This transducer was then used for a number of calibration runs in a 600 kN material testing machine where the time step interval of the same loading profile was varied from 120 s to 0 s. Results show good agreement for most of the range but highlight an increasing error due to synchronization and filtering issues in measured signals when approaching very short step intervals and continuous loading.
Ključne besede: force calibration, loading profile, measurement uncertainty, continuous loading
Objavljeno v DiRROS: 20.12.2023; Ogledov: 305; Prenosov: 150
Celotno besedilo (4,42 MB)
Gradivo ima več datotek! Več... |
1574. Compensation of synchronization error effect in testing machine calibrationMiha Hiti, 2021, izvirni znanstveni članek Povzetek: The paper presents an evaluation of synchronization issues when performing material testing machine calibration using continuous loading. A procedure for the compensation of a rangewide error in calibrated force values is proposed based on a correction factor determined from static and transient errors difference at a chosen force step. The procedure was applied for a calibration of a testing machine with a 20 kN force transducer and 200 N/s to 2000 N/s loading rates. The results show good performance of the compensation technique, reducing calibration errors to below 1% in non-synchronized signals even under unknown filter and delay setting.
Ključne besede: force calibration, loading profile, measurement uncertainty, continuous loading
Objavljeno v DiRROS: 20.12.2023; Ogledov: 276; Prenosov: 127
Celotno besedilo (5,97 MB)
Gradivo ima več datotek! Več... |
1575. |
1576. |
1577. |
1578. Gasdermin D permeabilization of mitochondrial inner and outer membranes accelerates and enhances pyroptosisRui Miao, Cong Jiang, Winston Y. Chang, Haiwei Zhang, Jinsu An, Felicia Ho, Pengcheng Chen, Han Zhang, Caroline Furtado Junqueira, Iva Hafner Bratkovič, 2023, izvirni znanstveni članek Objavljeno v DiRROS: 19.12.2023; Ogledov: 447; Prenosov: 75
Celotno besedilo (4,09 MB)
Gradivo ima več datotek! Več... |
1579. Selective demethylation reactions of biomass-derived aromatic ether polymers for bio-based lignin chemicalsFlorian Maximilian Harth, Brigita Hočevar, Tina Ročnik, Edita Jasiukaityte, Jana Blüm, Michael Fiedel, Blaž Likozar, Miha Grilc, 2023, pregledni znanstveni članek Objavljeno v DiRROS: 18.12.2023; Ogledov: 348; Prenosov: 123
Celotno besedilo (2,29 MB)
Gradivo ima več datotek! Več... |
1580. |
