Година XXVII, Книжка 5, 2018Следващ бройАрхивПредишен брой
Науката за образованието: теория и практика
ИМОБИЛИЗИРАНЕНАФРУКТОЗИЛТРАНСФЕРАЗА ВЪРХУКОМПОЗИТНИФИЛМИОТПОЛИМЛЕЧНА КИСЕЛИНА, КСАНТАН И ХИТОЗАН
Фруктозилтрансферазите катализират синтезата на полифруктозани от леванов тип в присъствие на захароза в реакционната среда. В присъствие на акцептори (малтоза, изомалтоза, лактоза, фруктоза) и донор на фруктозни единици – захароза, те синтезират олигозахари...
polylactic acid; corona discharge; fructosyltrasnferase; levansucrase; immobilized enzymes
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...
electrical impedance spectroscopy, graphene-doped liquid crystals, nanocomposite materials
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...
dilute nitrides; GaAsSbN; surface photovoltage; band gap shift
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...
H/V spectral ratio technique; ambient noise; fundamental frequency
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...
texture; Herschel-Bulkleymodel gluten free bread batter relaxation and retardation characteristics
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...
hydrocolloids; gluten-free cake; quality; staling; sensory analysis
ПОЛУЧАВАНЕ НА ПОЛИЕЛЕКТРОЛИТНИ КОМПЛЕКСИ ОТ ХИТОЗАН И КАЗЕИН
През последните десетилетия се провеждат интензивни изследвания върху взаимодействията между полиелектролитите и възможностите за образуване на полиелектролитни комплекси (ПЕК). Основната цел на тези изследвания е да се проучат свойствата на ПЕК и да се разши...
polyelectrolyte complexes; chitosan; casein; pH
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...
AlScN; Lamb wave; Lamb Wave Resonator (LWR); 6H-SiC, resonant frquency
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...
silk cocoon; chemiluminescence; antioxidant activity
ИНТЕРДИСЦИПЛИНАРНИТЕ УРОЦИ – ПРЕДИЗВИКАТЕЛСТВО ЗА УЧЕНИЦИТЕ И УЧИТЕЛИТЕ ПО ПРИРОДНИ НАУКИ
В статията е споделен опит в провеждането на бинарни уроци по физика и астрономия, биология и здравно образование, химия и опазване на околната среда, география и икономика, история и цивилизация, изобразително изкуство. Изброени са уроците, проведени с наш...
experience; lessons; collaboration; geography; fine art
ИЗСЛЕДОВАТЕЛСКИ ПРАКТИКУМ
Работата представя подход за провеждане на експериментална задача, аналогично на научно изследване, в рамките на практикум по физика. Включването на такава „изследователска“ задача цели да запознае студентите (или учениците) с базовите етапи от експеримента...
physical laboratory; research-like approach
Наука за напреднали и самообразование
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...
caffeine; chemiluminescence; chocolate; fragrance; methyl; NLAP; SOA
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...
Fourth state of matter; quantum entanglement; quantum potential