1. First insights into the antiviral activity of chitosan-based bioactive polymers towards the bacteriophage Phi6: physicochemical characterization, inactivation potential, and inhibitory mechanismsOlivija Plohl, Katja Fric, Arijana Filipić, Polona Kogovšek, Magda Tušek-Žnidarič, Lidija Fras Zemljič, 2022, izvirni znanstveni članek Opis: The outbreak of the worrisome coronavirus disease in 2019 has caused great concern
among the global public, especially regarding the need for personal protective equipment with
applied antiviral agents to reduce the spread and transmission of the virus. Thus, in our research,
chitosan-based bioactive polymers as potential antiviral agents were first evaluated as colloidal
macromolecular solutions by elemental analysis and charge. Three different types of low and high
molecular weight chitosan (LMW Ch, HMW Ch) and a LMW Ch derivative, i.e., quaternary chitosan
(quart-LMW Ch), were used. To explore their antiviral activity for subsequent use in the form of
coatings, the macromolecular Chs dispersions were incubated with the model virus phi6 (surrogate
for SARS-CoV-2), and the success of virus inactivation was determined. Inactivation of phi6 with
some chitosan-based compounds was very successful (>6 log), and the mechanisms behind this
were explored. The changes in viral morphology after incubation were observed and the changes in
infrared bands position were determined. In addition, dynamic and electrophoretic light scattering
studies were performed to better understand the interaction between Chs and phi6. The results
allowed us to better understand the antiviral mode of action of Chs agents as a function of their
physicochemical properties.
Ključne besede: bacteriophage phi6, bioactive polysaccharide biomaterials, chitosans, antiviral activity, dynamic and electrokinetic light scattering, charge, biointerfaces
Objavljeno v DKUM: 26.03.2025; Ogledov: 0; Prenosov: 1
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2. Nanochemistry and Materials : a Laboratory ManualJanja Stergar, Irena Ban, 2022, delovni zvezek za višje in visoke šole Opis: The publication contains instructions for laboratory work in the subject Nanochemistry and Materials. Students are introduced to the experimental principles of nanochemistry in the laboratory. They learn about various synthesis and characterization methods, in conjunction with magnetic nanoparticles useful in biomedical and engineering applications. They learn about the safety of nanoparticles and their effects, impact on technology, and contribution to improving life on many levels when used properly. The instructions are written in English as they are intended for foreign students who choose the mentioned subject.
Ključne besede: magnetic nanoparticles, coprecipitation, microemulsion technique, X-Ray powder diffraction, dynamic light scattering
Objavljeno v DKUM: 29.08.2022; Ogledov: 686; Prenosov: 97
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3. Effect of base sequence on G-wire formation in solutionLea Spindler, Martin Rigler, Irena Drevenšek Olenik, Mateus Webba da Silva, Nason Ma'ani Hessari, 2010, izvirni znanstveni članek Opis: The formation and dimensions of G-wires by different short G-rich DNA sequences in solution were investigated by dynamic light scattering (DLS) and polyacrilamide gel electrophoresis (PAGE). To explore the basic principles of wire formation, we studied the effects of base sequence, method of preparation, temperature, and oligonucleotide concentration. Both DLS and PAGE show that thermal annealing induces much less macromolecular self-assembly than dialysis. The degree of assembly and consequently length of G-wires (5-6 nm) are well resolved by both methods for DNA sequences with intermediate length, while some discrepancies appear for the shortest and longest sequences. As expected, the longest DNA sequence gives the longest macromolecular aggregates with a length of about 11 nm as estimated by DLS. The quadruplex topologies show no concentration dependence in the investigated DNA concentration range (0.1 mM–0.4 mM) and no structural change upon heating.
Ključne besede: DNA, dynamic light scattering, DLS, polyacrylamide gel electrophoresis, PAGE, genetics
Objavljeno v DKUM: 14.06.2017; Ogledov: 1788; Prenosov: 373
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