Обучение по природни науки и върхови технологии

НАЦИОНАЛЕН КОНКУРС НА ФОНДАЦИЯ „ВИГОРИЯ“ – „С ЛЮБОВ КЪМ НАУКАТА“

PERCEPTION OF PRESERVICE SCIENCE TEACHERS IN THE CONSTRUCTIVIST SCIENCE LEARNING ENVIRONMENT

Science learning was affected by various kinds of sources which students perceived and participated in classroom. The purpose of this study aims to investigate the science learning environment of preservice science teachers from Thailand and Czech Republic....

ИНТЕРАКТИВНИ МЕТОДИ И ВЪЗМОЖНОСТИ ЗА ПРИЛОЖЕНИЕТО ИМ В ОБУЧЕНИЕТО ПО „БИОЛОГИЯ И ЗДРАВНО ОБРАЗОВАНИЕ“, VІІ КЛАС, С ЦЕЛ ЗДРАВНО ВЪЗПИТАНИЕ НА УЧЕНИЦИТЕ

Настоящото изследване е част от дидактически експеримент, целта на който е да установи възможностите за приложение и ефективността на някои интерактивни методи на обучение по „Биология и здравно образование“ в VІІ клас с цел здравно възпитание на учениците....

ENHANCING THAI STUDENTS’ THINKING SKILLS ABOUT ENERGY ISSUES: INFLUENCE OF LOCAL VALUES

The study aimed to enhance Thai students’ thinking skills on learning about energy related to influence of local value. The participants consisted of 132 Grade 9 students from three different schoolsin Khon Kaen, in North East Thailand. The three participati...

LIQUID-LIQUID EXTRACTION AND SPECTROPHOTOMETRIC CHARACTERIZATION OF SOME NEW ION-ASSOCIATED COMPLEXES OF Co(II) WITH INT: APPLICATION OF THE DEVELOPED METHOD FOR ANALYSIS OF SOIL COBALT CONTENT

The study presents a newly-developed method for extractionspectrophotometric determination of Co(II) in samples by means of iodnitrotetrazolium chloride. The electronic spectrum of cobalt ion associated has a peak at 630 nm. At that wavelength the absorptio...

QUANTUM CONFINEMENT OF MOBILE \(\mathbf{N a}^{\mathbf{+}}\) IONS IN SODIUM SILICATE GLASSY NANOPARTICLES

The confinement of mobile \(\mathrm{Na}^{+}\)ions in sodium silicate glassy nanoparticles is considered quantum mechanically to be under the influence of a spherical box potential. The values for the energies of mobile \(\mathrm{Na}^{+}\)ions are determined...

CONSERVATION OF THE UPSTREAM OPEN READING FRAMES IN THE GENES FOR THE ERB-B2 RECEPTOR TYROSINE KINASE 2 IN VERTEBRATES

In humans a short open reading frame (ORF) precedes the sequence of the erb-b2 receptor tyrosine kinase 2 (ERB-B2). It is established that the upstream ORF plays an important role in ERB-B2 gene expression. In this report we show that an upstream ORF is pre...

OPTIMIZATION OF ENGINE OIL FORMULATION USING RESPONSE SURFACE METHODOLOGY AND GENETIC ALGORITHM: A COMPARATIVE STUDY

Two potent mathematical and statistical methods of response surface methodology (RSM) and genetic algorithm (GA) based on artificial neural network (ANN) were employed for prediction and optimization of three-constituent synthetic engine oil. Polyalpha oleph...

CHEMOMETRICASSISTEDSPECTROPHOTOMETRIC ESTIMATION OF LANSOPRAZOLE AND DOMEPERIDONE IN BULK AND COMMERCIAL DOSAGE FORM

Chemometric calibrations namely, Partial least square (PLS), principal component regression (PCR) and classical least square (CLS), were developed for the simultaneous determination of domeperidone and lansoprazole from combined pharmaceutical dosage forms....

EVALUATION OF ANTIBACTERIAL ACTIVITY OF DIFFERENT SOLVENT EXTRACTS OF TEUCRIUM CHAMAEDRYS (L. ) GROWING WILD IN KOSOVO

In this study the antibacterial efficiency of different organic extracts from Teucrium chamaedrys (L.), growing wild in Kosovo, was examined. Methanol, ethyl acetate, acetone, diethyl ether, water and chloroform extracts were tested against three gram posit...

НЕПОЗНАТО ЗА ПОЗНАТИТЕ: АЛЕКСАНДЪР МИХАЙЛОВИЧ БУТЛЕРОВ

Александър Михайлович Бутлеров (1818 – 1886) е велик руски химик. Той е създател на теорията за строежа на органичните съединения. Тази статия съдържа неизвестни детайли от живота и дейността на Бутлеров. Слагането на акцент върху това, което е малко познат...

QUALITY ASSESSMENT OF SUPPLY WATER OF GJAKOVA CITY (KOSOVO) : A CASE STUDY OF CORRELATION COEFFICIENTS BETWEEN CHEMICAL DATA

In this study the quality assessment of supply water of Gjakova in the period time January to October was investigated. Statistical studies have been carried out by calculating of basic statistical parameters, anomalies and correlation coefficients between di...

АЛЕКСАНДЪР ПАНАЙОТОВ