Iskanje po katalogu digitalne knjižnice

Opis: Dentures and epitheses are mostly made from poly(methyl methacrylate) (PMMA), which does not show antimicrobial properties. They present reservoirs of microorganisms grown in biofilms. The aim of this study is to prepare a PMMA enriched with gold nanoparticles (AuNPs)- PMMA/AuNPs and the examination of its physical, mechanical and antimicrobial properties. The AuNPS were synthetized from HAuCl4 using the ultrasonic spray pyrolysis method with lyophilization. The PMMA/AuNP samples were compared to PMMA samples. Density was measured by pycnometer. Microhardness was evaluated using the Vickers hardness test. Monomicrobial biofilm formation (Streptococcus mitis, Candida albicans, Staphylococcus aureus and Escherichia coli) was measured by colony-forming units (CFUs) and MTT test and visualized by SEM. AuNP release was measured indirectly (the CFUs of the medium around the sample). The density and microhardness of the PMMA/AuNPs were similar to those of the PMMA. CFU and MTT values for the biofilms formed on the PMMA for each of the tested species were higher than those of the biofilms formed on the PMMA/AuNPs. The CFUs of the medium around the sample were similar for both materials. PMMA/AuNPs showed a significant reduction in the monomicrobial biofilms of all tested species. AuNPs are not released from PMMA/AuNPs. Density, indirect measurement of residual monomer and dentures weight were similar between PMMA and PMMA/AuNPs. Microhardness, as a measure of the wear resistance, was also similar between tested discs.
Ključne besede: PMMA, gold nanoparticles (AuNPs), biofilm, antibiofilm effect
Objavljeno v DKUM: 24.03.2025; Ogledov: 0; Prenosov: 2
Celotno besedilo (4,99 MB)
Gradivo ima več datotek! Več...

Opis: Z napredkom tehnologije je podjetje Nike prilagodilo svoje trženjske strategije, pri čemer je vse večjo pozornost posvetilo uporabi digitalnih komunikacijskih kanalov. V teoretičnem delu diplomske naloge smo pregledali ključne koncepte in teorije komunikacije v mednarodnem trženju, s posebnim poudarkom na digitalnih komunikacijskih kanalih, kot so družbena omrežja in e-pošta. Analizirali smo njihove značilnosti, prednosti ter izzive, ter raziskali vpliv digitalnih komunikacijskih strategij na prepoznavnost blagovne znamke in prodajo v mednarodnem okolju. Prav tako smo primerjali učinkovitost digitalnih strategij s tradicionalnimi pristopi komuniciranja. V empiričnem delu smo se osredotočili na podjetje Nike, kjer smo pridobili podatke o uporabi različnih digitalnih komunikacijskih kanalov za komuniciranje s ciljnimi trgi. Analizirali smo zbrane podatke ter identificirali ključne dejavnike, ki vplivajo na uspešnost digitalnega komuniciranja podjetja Nike v mednarodnem trženju. Ugotovili smo, da Nike uspešno uporablja digitalne kanale, vendar obstajajo še dodatne priložnosti za izboljšanje učinkovitosti in prilagoditev strategij različnim kulturnim okoljem.
Ključne besede: digitalni kanali komuniciranja, spletna prisotnost, e – poštni marketing, kulturne razlike, Nike
Objavljeno v DKUM: 16.10.2024; Ogledov: 0; Prenosov: 36
Celotno besedilo (1,13 MB)

Opis: For successful dosing of plant protection products, the characteristics of the vine canopies should be known, based on which the spray amount should be dosed. In the field experiment, we compared two optical experimental methods, terrestrial lidar and aerial photogrammetry, with manual defoliation of some selected vines. Like those of other authors, our results show that both terrestrial lidar and aerial photogrammetry were able to represent the canopy well with correlation coefficients around 0.9 between the measured variables and the number of leaves. We found that in the case of aerial photogrammetry, significantly more points were found in the point cloud, but this depended on the choice of the ground sampling distance. Our results show that in the case of aerial UAS photogrammetry, subdividing the vine canopy segments to 5 × 5 cm gives the best representation of the volume of vine canopies.
Ključne besede: precision agriculture, remote sensing, 3D point clouds, vineyard, canopy reconstruction, terrestrial lidar, aerial photogrammetry, manual defoliation
Objavljeno v DKUM: 15.07.2024; Ogledov: 123; Prenosov: 11
Povezava na celotno besedilo
Gradivo ima več datotek! Več...

Opis: We report the case of severe valproate intoxication presenting as multiorgan failure. This is the first report to describe severe cardiac involvement, in which a 19-year-old woman developed atrial fibrillation, diffuse T wave inversion and QT c interval prolongation with elevated specific biochemical markers of myocardial damage. After 7 days of treatment, including supportive care, gas tric lavage, activated charcoal, mannitol and hemodialysis, the patient recovered completely . After the poisoning there were no patho- logical echocardiographic changes and one month after discharge exercise stress testing did not provoke ischemia or arrhythmias.
Ključne besede: kardiotoksičnost, večorganska odpoved, valproat
Objavljeno v DKUM: 19.04.2024; Ogledov: 167; Prenosov: 3
Celotno besedilo (89,58 KB)
Gradivo je zbirka in zajema 1 gradivo!

Opis: Critical illness may disrupt nutritional, protective, immune, and endocrine functions of the gastrointestinal tract, leading to a state of gastrointestinal dysmotility. We aimed to identify factors associated with the occurrence of gastrointestinal dysmotility in critically ill patients. A cross-sectional retrospective study was conducted, using patient files as a source of data. The study included 185 critically ill patients treated in the intensive care unit of the University Clinical Center, Kragujevac, Serbia, from January 1, 2016, to January 1, 2022. Significant risk factors associated with some form of gastrointestinal dysmotility were acute kidney injury (with paralytic ileus, nausea, vomiting, and constipation), recent abdominal surgery (with ileus, nausea, vomiting, and constipation), mechanical ventilation (with ileus, and nausea), age (with ileus and constipation), and use of certain medication such as opioids (with ileus, gastro-esophageal reflux, nausea, vomiting, and constipation), antidepressants (with ileus, nausea, and vomiting), and antidiabetics (with ileus). On the other hand, Charlson comorbidity index had divergent effects, depending on the form of gastrointestinal dysmotility: it increased the risk of gastro-esophageal reflux but protected against ileus, nausea, and vomiting. In clonclusion, recognition of factors associated with gastrointestinal dysmotility should initiate preventative measures and, thus, accelerate the recovery of critically ill.
Ključne besede: gastrointestinal dysmotility, critically ill patients, risk factors, intensive care unit
Objavljeno v DKUM: 04.04.2024; Ogledov: 188; Prenosov: 11
Celotno besedilo (372,51 KB)
Gradivo ima več datotek! Več...