Search results for: Iztok Dogsa

Items from 1 to 9 out of 9 results

article

Liposome destruction by hydrodynamic cavitation in comparison to chemical, physical and mechanical treatments

Žiga Pandur, Iztok Dogsa, Matevž Dular, David Stopar

Ultrasonics Sonochemistry > 2020 > 61 > C

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...

article

Physicochemical data on aqueous polymeric systems of methyl cellulose and lambda- and kappa-carrageenan: SAXS, rheological, densitometry, and sound velocity measurements

Jure Cerar, Iztok Dogsa, Andrej Jamnik, Matija Tomšič

Data in Brief > 2017 > 15 > C > 427-438

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...

article

Supramolecular structure of methyl cellulose and lambda- and kappa-carrageenan in water: SAXS study using the string-of-beads model

Iztok Dogsa, Jure Cerar, Andrej Jamnik, Matija Tomšič

Carbohydrate Polymers > 2017 > 172 > C > 184-196

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...

article

Viscoelastic Properties of Levan-DNA Mixtures Important in Microbial Biofilm Formation as Determined by Micro- and Macrorheology

Biljana Stojković, Simon Sretenovic, Iztok Dogsa, Igor Poberaj, more

Biophysical Journal > 2015 > 108 > 3 > 758-765

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...

article

New carboxymethyl cellulose tosylate with low biodeterioration

Janez Orehek, Klemen Petek, Iztok Dogsa, David Stopar

Carbohydrate Polymers > 2014 > 113 > Complete > 16-21

Microbial biodegradation and biodeterioration of cellulose based thickeners is a serious problem in industry. A new tosylic ester of carboxymethyl cellulose (TsCMC) was prepared with anhydride of p-toluensulphonic acid. The TsCMC has improved rheological properties, higher viscosity and pseudoplasticity, superior emulsification properties and decreased wettability compared to parental CMC. The biodeterioration...

article

Amorphous supramolecular structure of carboxymethyl cellulose in aqueous solution at different pH values as determined by rheology, small angle X-ray and light scattering

Iztok Dogsa, Matija Tomšič, Janez Orehek, Elizabeta Benigar, more

Carbohydrate Polymers > 2014 > 111 > Complete > 492-504

Carboxymethyl cellulose (CMC) is one of the most widely used thickening agents in industry. The combination of small-angle X-ray scattering (SAXS), static and dynamic light scattering, as well as viscosity measurements and microscopy at different pH values was utilized to explore the physicochemical properties of CMC on a scale ranging from individual macromolecules to supramolecular assemblies. The...

article

Structural investigation of carboxymethyl cellulose biodeterioration by Bacillus subtilis subsp. subtilis NCIB 3610

Janez Orehek, Iztok Dogsa, Matija Tomšič, Andrej Jamnik, more

International Biodeterioration & Biodegradation > 2013 > 77 > Complete > 10-17

Structural changes of carboxymethyl cellulose (CMC) during biodeterioration with Bacillus subtilis subsp. subtilis NCIB 3610 were studied with small-angle X-ray scattering (SAXS), size exclusion chromatography, and viscosity measurements. Cleavage of CMC polymers changed flow characteristics from those of non-Newtonian pseudoplastic fluid to those of Newtonian fluid. The viscosity decreased from 10...

article

Efficient modeling of polysaccharide conformations based on Small-Angle X-ray Scattering experimental data

Iztok Dogsa, Janez Štrancar, Peter Laggner, David Stopar

Polymer > 2008 > 49 > 5 > 1398-1406

Small-Angle X-ray Scattering (SAXS) curves of pullulan oligomers and gellan gum were modeled with a new string of beads model. The model enables one to simulate polysaccharide single helices with different pitch values, number of monomers per pitch, and cross-sectional radius, as well as different random coils with excluded volume taken into account. The vast conformational space of possible polysaccharide...

article

Structure of Bacterial Extracellular Polymeric Substances at Different pH Values as Determined by SAXS

Iztok Dogsa, Manfred Kriechbaum, David Stopar, Peter Laggner

Biophysical Journal > 2005 > 89 > 4 > 2711-2720

Extracellular polymeric substances (EPS) play an important role in cell aggregation, cell adhesion, and biofilm formation, and protect cells from a hostile environment. The EPS was isolated by trichloroacetic acid/ethanol extraction from broth culture of a marine bacterium isolate. The EPS was composed of glucose and galactose as determined by HPLC and TLC; the protein content was on average 15±5%...

Filter options

Publication date

Set your own date range

Keywords

BIODETERIORATION (2)
CARBOXYMETHYL CELLULOSE (2)
CMC (2)
KAPPA-CARRAGEENAN (2)
LAMBDA-CARRAGEENAN (2)
METHYL CELLULOSE (2)
SAXS (2)
VISCOSITY (2)
BACILLUS SUBTILIS SUBSP. SUBTILIS NCIB 3610 (1)
BASIC POLYMER CHARACTERIZATION (1)
BIODEGRADATION (1)
CLASSIC APPROACH (1)
CONFOCAL LASER MICROSCOPY (1)
DEBYE-BUECHE (1)
DLS (1)
DOPC (1)
FLUORESCEIN RELEASE (1)
FOOD-GRADE POLYMERS (1)
GIANT LIPID VESICLES (1)
HYDRODYNAMIC CAVITATION (1)
MACROMOLECULAR STRUCTURE (1)
ORNSTEIN-ZERNIKE (1)
POLYSACCHARIDES (1)
SIZE EXCLUSION CHROMATOGRAPHY (1)
SMALL ANGLE X-RAY SCATTERING (1)
STABILITY (1)
STRING-OF-BEADS MODEL (1)
STRUCTURE (1)
SUPRAMOLECULAR STRUCTURE (1)
TOSYLATE (1)
more

Journal

Carbohydrate Polymers (3)
Biophysical Journal (2)
Data in Brief (1)
International Biodeterioration & Biodegradation (1)
Polymer (1)
Ultrasonics Sonochemistry (1)

INFONA - science communication portal

Search results for: Iztok Dogsa

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Keywords

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options