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Iztok Dogsa
University of Ljubljana
20Publications
9H-index
336Citations
Publications 20
Newest
#1Žiga Pandur (University of Ljubljana)H-Index: 1
#2Iztok Dogsa (University of Ljubljana)H-Index: 9
Last.David Stopar (University of Ljubljana)H-Index: 19
view all 4 authors...
Abstract Liposomes are widely applied in research, diagnostics, medicine and in industry. In this study we show for the first time the effect of hydrodynamic cavitation on liposome stability and compare it to the effect of well described chemical, physical and mechanical treatments. Fluorescein loaded giant 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) lipid vesicles were treated with hydrodynamic cavitation as promising method in inactivation of biological samples. Hydrodynamic treatment was ...
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#1Maruša Horvat (University of Ljubljana)
#2Archana Pannuri (UF: University of Florida)H-Index: 8
Last.David Stopar (University of Ljubljana)H-Index: 19
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How the viscoelastic properties of the extracellular matrix affect the various biological functions conferred by biofilms is an important question in microbiology. In this study, the viscoelastic response of Escherichia coli biofilms to the genetically altered expression of extracellular matrix components was studied. Biofilms of the wild type E. coli MG1655 and its mutant strains producing different amounts of extracellular matrix components (curli, colanic acid, and poly-β-1,6-N-acetyl-D-gluco...
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#1David StoparH-Index: 19
#2Simon SretenovicH-Index: 6
Last.Igor PoberajH-Index: 20
view all 6 authors...
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#1Simon Sretenovic (University of Ljubljana)H-Index: 6
#2Biljana Stojković (University of Ljubljana)H-Index: 3
Last.David Stopar (University of Ljubljana)H-Index: 4
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It is generally accepted that planktonic bacteria in dilute suspensions are not mechanically coupled and do not show correlated motion. The mechanical coupling of cells is a trait that develops upon transition into a biofilm, a microbial community of self-aggregated bacterial cells. Here we employ optical tweezers to show that bacteria in dilute suspensions are mechanically coupled and show long-range correlated motion. The strength of the coupling increases with the growth of liquid bacterial c...
3 CitationsSource
#1Jure Cerar (University of Ljubljana)H-Index: 3
#2Iztok Dogsa (University of Ljubljana)H-Index: 9
Last.Matija Tomšič (University of Ljubljana)H-Index: 28
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Abstract General as well as more specific physicochemical data obtained by studying the structure and various dynamical properties of aqueous polymer systems of methyl cellulose, λ − carrageenan, and κ − carrageenan are presented in graphical and numeric tabular form. The data provide basic polymer characterization info as also a specific structural and dynamical info for aqueous solutions of three industrially very important polymers (food additives) that are available commercially. The commerc...
3 CitationsSource
#1Iztok Dogsa (University of Ljubljana)H-Index: 9
#2Jure Cerar (University of Ljubljana)H-Index: 3
Last.Matija Tomšič (University of Ljubljana)H-Index: 28
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Abstract A detailed data analysis utilizing the string-of-beads model was performed on experimental small-angle X-ray scattering (SAXS) curves in a targeted structural study of three, very important, industrial polysaccharides. The results demonstrate the quality of performance for this model on three polymers with quite different thermal structural behavior. Furthermore, they show the advantages of the model used by way of excellent fits in the ranges where the classic approach to the small-ang...
1 CitationsSource
#1Elizabeta BenigarH-Index: 3
Last.Matija TomšičH-Index: 28
view all 7 authors...
In this paper, we report on the structure and dynamics of biologically important model polymer mixtures that mimic the extracellular polymeric matrix in native biofilm of Bacillus subtilis. This biofilm is rich in nonionic polysaccharide levan, but also contains other biopolymers such as DNA and proteins in small concentrations. Aiming to identify the contribution of each component to the formation of the biofilm, our investigations encompassed dynamic rheology, small-angle X-ray scattering, dyn...
7 CitationsSource
#1Elizabeta BenigarH-Index: 3
#2Matija TomšičH-Index: 28
Last.Iztok DogsaH-Index: 9
view all 6 authors...
Polysaccharide levan is a homopolymer of fructose and is an important component of plants, yeast, fungi and some bacterial biofilms. In this paper we report on the structural properties of aqueous solutions of bacterial levan utilizing small-angle X-ray scattering and light microscopy. In addition to commercially available levan isolated from Zymomonas mobilis and Erwinia herbicola , we also studied levan isolated and purified from the biofilm of Bacillus subtilis . The results of small-angle X-...
2 CitationsSource
#1Biljana Stojković (University of Ljubljana)H-Index: 3
#2Simon Sretenovic (University of Ljubljana)H-Index: 6
Last.David Stopar (University of Ljubljana)H-Index: 4
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We studied the viscoelastic properties of homogeneous and inhomogeneous levan-DNA mixtures using optical tweezers and a rotational rheometer. Levan and DNA are important components of the extracellular matrix of bacterial biofilms. Their viscoelastic properties influence the mechanical as well as molecular-transport properties of biofilm. Both macro- and microrheology measurements in homogeneous levan-DNA mixtures revealed pseudoplastic behavior. When the concentration of DNA reached a critical ...
11 CitationsSource
This study examines bacterial adhesion on titanium-substrates used for bone implants. Adhesion is the most critical phase of bacterial colonization on medical devices. The surface of titanium was modified by hydrothermal treatment (HT) to synthesize nanostructured TiO2-anatase coatings, which were previously proven to improve corrosion resistance, affect the plasma protein adsorption, and enhance osteogenesis. The affinity of the anatase coatings toward bacterial attachment was studied by using ...
77 CitationsSource
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