IMМOBILIZATION OF FRUCTOSYLTRANSFERASES ON COMPOSITE FILMS OF POLYLACTIC ACID, XANTHAN AND CHITOSAN

Fructosyltransferases catalyze the synthesis of Levan type polysaccharides in the presence of sucrose in the reaction medium. In the presence of acceptors (maltose, isomaltose, lactose, fructose) and fructose donor sucrose, they synthesize oligosaccharides wi...

ELECTRICAL IMPEDANCE SPECTROSCOPY OF GRAPHENE-E7 LIQUID-CRYSTAL NANOCOMPOSITE

We have examined the electrical response of graphenenanostructured liquid crystal E7. The nematic E7 was doped with graphene at concentration of 10 -3 wt.%. Thin planar-oriented films with a thickness of 7 µm of this nanocomposite were studied by means of el...

SURFACE PHOTOVOLTAGE SPECTROSCOPY CHARACTERIZATION OF GAASSBN LAYERS GROWN BY LIQUID-PHASE EPITAXY

We present an experimental study of GaAsSbN layers with thickness around 1μm, grown by liquid-phase epitaxy on n-type GaAs substrates. The samples are studied by surface photovoltage (SPV) spectroscopy at room temperature. The analysis of the SPV spectra h...

ON THE POSSIBILITY TO ANALYZE AMBIENT NOISERECORDED BYAMOBILEDEVICETHROUGH THE H/V SPECTRAL RATIO TECHNIQUE

The analysis of the spectral properties of ambient seismic noise has recently turned to be a promising approach in the study of site effects impact on seismic hazard. In the present paper we present some results from our investigation on the possibility to us...

RHEOLOGICAL PROPERTIES OF BATTER FOR GLUTEN FREE BREAD

Gluten free and not gluten free batters for bread were prepared from wheat, rice, chestnut, maize and sweet potato batters. The rheological parameters of different gluten free batters were analysed by texture analyser (relaxation and retardation test) and...

THE EFFECT OF HYDROCOLLOIDS CONCENTRATION ON THE PHYSICAL PROPERTIES OF GLUTEN-FREE CAKE

In the present study the influence of hydrocolloids addition at different concentration (0.45, 0.9 and 1.5 %) to gluten-free cakes was studies and the quality of cakes was investigated. Based on investigation results it was found that, with the addition of...

POLYELECTROLYTE COMPLEX FORMATION OF CHITOSAN AND CASEIN

In the recent decades, intensive studies have been performed on the interactions between polyelectrolytes and the possibilities for polyelectrolyte complex (PEC) formation. The main purpose of these studies is to investigate the properties of PECs and to ex...

DISTRIBUTION OF LAMB WAVES IN AlScN RESONATOR STRUCTURES

In this paper we present the results of a simulated model of resonator device comprised of AlScN/6H-SiC piezo-layers for use in RF electronic circuits. The device uses the piezoelectric effect and Al electrode gratings to generate Lamb waves with great frequen...

CHEMILUMINESCENT AND PHOTOMETRIC DETERMINATION OF THE ANTIOXIDANT ACTIVITY OF COCOON EXTRACTS

The extract obtained during the silk production contains sericin, which exhibits good antimicrobial, anticoagulant, antioxidant and other properties that make it interesting for medical applications. In the present paper, we tested the antioxidant activity...

INTERDISCIPLINARY LECTURES – A CHALLENGE FOR STUDENTS AND EDUCATORS

In this article we share our experience in conducting lessons of collaboration with subjects as: Physics and Astronomy, Biology and Health Education, Chemistry and Environmental Protection, Geography and Economics, History and Civilization, Fine Art: “Medi...

RESEARCH-LIKE STUDENT LAB

The work presents an approach in which an experimental assignment is carried out similarly to a scientific study in the frames of a student lab course. The approach aims to meet the students with the basic stages in experimental studies and to instill in them...

HISTORICAL DEVELOPMENT OF THE CONCEPTIONS OF REVERSIBILITY AND CHEMICAL EQUILIBRIUM – A BASE FOR THEIR TEACHING AND LEARNING

Chemical equilibrium is a key conception in chemistry education both at high school and university. The teaching and learning of chemical equilibrium are associated with difficulties which can be related to the introduction of specific historical views. In t...

INSTRUMENTS FOR USING THE CHEMICAL EXPERIMENT AND SELF-ASSESSMENT IN THE STRATEGIES FOR ACTIVE TEACHING IN MAN AND NATURE SUBJECT

In this paper the author shares her ownteaching experience and suggests instruments for realisation of a laboratory work of “Chemical properties of substances” 6th grade and for self-assessment of students’ individual work and assessment of students’ group wor...

METHYL, THE SMALLEST ALKYL GROUP WITH STUNNING EFFECTS

In several instances, methyl group was found to play a pivotal role when present in a molecule. Its hydrophobic character has been the key success factor for specific performances when lipophilicity is the basic requirement for a phenomenon to occur. In som...

THE FOURTH STATE OF MATTER

It is shown that quantum entanglement is the only force able to maintain the fourth state of matter, possessing fixed shape at an arbitrary volume. Accordingly, a new relativistic Schrödinger equation is derived and transformed further to the relativistic Bo...

НОВИ ИЗМЕРЕНИЯ НА УЧЕНЕТО: СИНТЕЗ НА ИНОВАЦИИ И ТРАДИЦИИ