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2014/1, стр. 73 - 87

INCREASING STUDENTS’ INTEREST IN CHEMISTRY WITH CONTEXT-BASED APPROACHES FOR CONTROL AND ASSESSMENT IN THE ENGLISH LANGUAGE PROGRAM AT MEDICAL UNIVERSITY IN VARNA

Zlatina Peteva
E-mail: zlatina_peteva@mail.bg
Medical University – Varna
55 Marin Drinov Str.
9200 Varna Bulgaria
Lubomir Makedonski
Medical University – Varna
55 Marin Drinov Str.
9200 Varna Bulgaria
Mona Stancheva
Medical University – Varna
55 Marin Drinov Str.
9200 Varna Bulgaria

Резюме: In the Department of Chemistry, University of Varna, Bulgaria, students of the English language course are thought for 5 years. There was a need for adaptation of chemistry curriculum to the needs and requirements of the new students. Recognizing that a graduate in chemistry has knowledge that is necessary for understanding of chemical principles applied in further study subjects, a context- based approach is used in chemistry practice and lectures. Increasing the students’ interest to chemistry as a preclinical discipline aims to motivate their curiosity and help them learn. Based on the Bloom’s taxonomy we suggest the students 6 types of tasks for the laboratory and seminar works. We use the tasks for control as well as for assessment. Using a well-known guideline, students perform the seminar and practical work and get used to follow instructions, an approach often used in the physicians’ practice. The topic “Amino acids” is proposed as an example how the experimental procedure is compared to a clinical procedure.

Ключови думи: English language course, context-based approaches, tasks for control and assessment, guideline for performing seminar and practical works

45-та Национална конференция на учителите по химия

Габрово, 25-27 октомври 2013 г.

Introduction

Varna Medical University was established as a Higher Medical Institute in 1960. The university diplomas are recognized in all EU countries.

For 5 years the Department of Chemistry1) have been thought students in English language program. The different nation‘s origin, chemistry and language knowledge provided a curriculum adaptation for the needs of the new students.

Chemistry is taught in 60 hours lectures and 45 hours practice and seminars which are divided in two semesters.

Chemistry is now taught in the first year of academic study - winter and summer semesters. Graduate in chemistry has knowledge that is necessary for understanding of chemical principles applied in further study subjects. General and inorganic chemistry provides students with understanding of solution properties, principles and techniques for qualitative, quantitative and instrumental analysis, acids, bases, buffer solutions and basic physic-chemical laws.

Organic chemistry enables students to become familiar with compounds and reactions taking part in metabolism and organic compounds that have importance in toxicology.

Seminars and laboratory practices are complementary to chemistry lectures. The knowledge of general, inorganic and organic chemistry is thoroughly practiced during chemistry seminars. This is accomplished with discussions on different topics, solving problems and naturally performing chemical experiments. Students have to evaluate and comment their results at the end of the class.

Managing students’ interest to chemistry

Motivation drives the process of starting and continuing learning. Relevance refers to activities that give the students satisfaction and meet their needs, including the chance to achieve personal learning goals. In order to capture students’ attention and activate their motivation to learn, teachers must consider the relevance of each topic. Then they can connect science with students’ interests, personal lives, societal issues, cultural backgrounds, and other school subjects (Staver, 2007).

Science is an inspiring process of discovery that helps satisfy the natural curiosity with which we are all born. Unfortunately, traditional instruction that misrepresents science as a body of facts to be memorized can deaden students‘ spirit of inquiry2) .

Fortunately, fostering such understandings needn‘t require reorganizing the entire curriculum. Simple shifts in how content and activities are approached can make a big difference in overcoming student misconceptions and building more accurate views of the process of science. Educational research supports the following strategies for teaching about the scientific endeavor: Make it explicit: Key concepts regarding the nature and process of science should be explicitly and independently emphasized. Engaging in inquiry and studying the history of science are most helpful when the nature-of-science concepts they exemplify are explicitly drawn out in discussion and interactions; Help them reflect: Throughout instruction, students should be encouraged to examine, test, and revise their ideas about what science is and how it works; Give it context, again and again: Key concepts about the nature and process of science should be revisited in multiple contexts throughout the year, allowing students to see how they apply to real-world situations.

Maintaining students’ interest to the preclinical disciplines is important for saving their motivation for learning. Unfortunately well-known questions from high school chemistry “ Why do we learn this? “ and “ What do we need this for?” can still be heard in students’ classes. The lack of systematic knowledge and skills to students in science, which they demonstrate in different situations in practice and life outside of school and the perishable nature of this knowledge, proves that there is a rift between teaching and learning in the form in which they are traditionally implemented. One way to handle this problem is the use of different contexts of science as a starting point for the development of scientific knowledge (Gendjova, 2012). Therefore we should not forget that Science Education is not only of interests to specialists of different didactics, but also to all professors. In many universities before starting their academic work all new assisting professors and teachers should graduate a course of pedagogy (didactics, etc.). Aim of the university professors at medical schools is not only mastering the theoretical foundations of the structure and reactivity of the compounds, but also a developing in the future physician a skill of prompt transfer of the acquired knowledge in appropriate situation. Namely in the second professors in advance must be considered the context of chemical knowledge and offer students assignments in which they themselves will see the relationship of chemistry to their real professional life.

We have the idea to combine and integrate topics from other science’s disciplines in order to give much more attention to the teaching, and hence the medical students’ learning process. Biochemistry, pathology, pharmacology and clinical medicine are just a portion of the list of disciplines which are based on chemistry. Fig. 1 represents the correlation between different preclinical disciplines - Chemistry, Biochemistry and Physiology.

Proteins:-Functional role of proteinsin humans-Higher levels of proteinorganization-Protein stability-Methods forcharacterization, purificationand study of proteinstructureand organizationOxygentransport:-Hemoglobin-characteristics-O2capacity andcontent-Causes ofhypoxemiaAmino acids:-Structure-Classification-ChargePeptides andproteins-Structure-Color tests forproteinsChemistryBiochemistryPhysiology

Fig. 1. Correlation between different medical disciplines

To enhance this situation we have also adapted the chemical curriculum to the specific interests of the students of medicine and dental medicine including use and application of important for medical and dental medical practice substances and techniques (Makedonski et al., 2013a).

The topic “Testing for cations and anions” contains tabled information about importance of ions in human body; students comment hypothetical situations and find out how to handle them. At the end of the class students determine the presence of some ions in biological samples (Fig. 2).

Fig. 2. Topic “Testing for cations and anions”

Context-based approaches for control and assessment

Kotzé (2003) cites assessment as an encompassing concept that is associated with concepts like measurement, evaluation, testing, standards and criteria. Context-based assessment models use open, interpretive items that describe scenarios of real life events in which scientific concepts are embedded. The assessment tasks require of students to use scientific knowledge to interpret and explain occurrences in real world situations presented in the questions. The assumption is that if students succeed in providing a scientifically sound answer to a context-based question then they have understood the scientific concepts embedded in the questions (Ahmed & Pollitt, 2007).

Not only is there a call for more inclusive assessment models, but there is also a need to recognise the importance of students’ and teachers’ perceptions about assessment practices and formats. Perceptions about classroom processes of teaching and learning held by teachers and students affect implementation of new reforms in curricula and assessment in significant ways (Aschbacher, 1991). These perceptions influence and maintain students’ motivation in preparing, performing and persevering with tasks they see as important, useful and of value in their learning, development of skills and achievement (Ames & Archer, 1998).

The success of context-based teaching has been observed not only in students’ increased enthusiasm and motivation but also in the delivery of content in chemistry (Belt et al., 2005). Belt et al. (2005) conducted a case study in the United Kingdom in which students were introduced to thermodynamics and kinetics. Students were required to identify fuel sources for a hypothetical newly established city through interpreting and evaluating a variety of physical chemistry data. Students were also expected to develop and use a variety of skills relating to group work, such as communication, organisation, problem-solving and critical thinking. All this work culminated in oral presentations and reports by the students. Students were, in addition, asked to indicate their perceived level of difficulty with regard to the tasks.Participating students appreciated studying Chemistry within an applied context and felt that the approach could lead to the development of their subject knowledge and their perception of its relevance. Some students expressed a perceived increased confidence in approaching problem-solving in the future. A number of students found the calculations in tasks challenging until they realised a familiar method to use in the calculations. Further difficulties reported by students were: working out how to approach the task, knowing where to start with the task, understanding what was asked, as well as deciphering each task to know which bits of information to use (but were fine once that was done).

Context-based assessment in our practice

In this paper we summarize the types of problems we use for assessment during practical exercises and those for tests and final exam. Our research in this area provided information about the possible function of assessment in promoting students’ learning as a direct outcome of engaging in assessment tasks.

This promotion of learning was in addition to the mastery of subject content by students from revision exercises and practice of the skill of answering assessment questions. It is clear that assessment activities could also serve as learning activities during which students could develop new knowledge and skills. 3)

For example control and application of the knowledge during class or for revision are achieved with following task (Fig. 3).

A ceruloplasmin test (which tests the copper level in blood) was ordered for a patient with following signs and symptoms:

– Anemia

– Nausea, abdominal pain

– Jaundice

– Fatigue etc.

Lab Tests OnlineUniversity Medical Center, Dept. of Pathology02/14/2012Varna10:05Doe, Mr. John Q. Patient ID:Ordering MD: Smith, Peter MDPT medications: multivitaminsSpecimen collected: 2/10/2012 14:30Specimen : Serum, UrineTest namePatient’s ResultRef. RangeFree serum copper1,21.6-2.4 μmol/LTotal copper810-22 μmol/LSerumceruloplasmin2,42.83-5.50 μmol/L24-hour urinecopper0,20.3-0.8 μmol1. Examine the results and prescribe e diet for this patient. 2. Order a procedure for investigating the presence of copper in a concrement

Fig. 3. Example task for control and application of knowledge

In our work with students of English language program, we have prepared different types of tasks, both for the laboratory and seminar work, semester tests (colloquiums) and final exams. This is how we cope with differences in pre-linguistic and chemical knowledge of the students. Tasks can be classified as follows taking into account the new Bloom’s taxonomy4) (Table 1).

Table. 1. Classification of tasks according Bloom’s taxonomy

Art of thetask accord-ing BloomTasks for laboratory and seminar workTasks for semesterand final testsTasks forreproducingand remem-bering theinformationPre-lab Study Questions1. What is the difference between a water-soluble vitaminand a fat-soluble one? 2. What is the metabolic role of vitamin C? 3. What foods contain large quantities of vitamin C? 4. What disease is associated wit ha diet lacking in vita-min C? Draw with chemicalstructures maleic andfumaric acids. Identifythe one that is a me-tabolite in citric acidcycle. Alipid necessary for the blood clotting is ……………a. cephalin b. lecithin c. sphingomyelin d. leukotrieneTasks forunderstandingthe informa-tionWhat is the chemicalstructure of salicylicacid? Drawthe chem-ical structures of threederivatives that areused in medicine. An ion(s) necessary for the formation of bones and teethis/are …An ion(s) necessary for the formation of hemoglobin is/are …The principal extra cellular positive ion is … . The principal intracellular cation is … . Serological test ismade to detect serumantibodies that appearspecically in associa-tion with certain diseas-es. Averonal solution(mixture of barbituricacid+ sodium barbitu-rate; pH=7.28-7.64) isused as a diluent and/orstabilizer. For experi-mental purposes a cer-tain quantity of strongacid/base is added tothe solution and littlechange in pH occurs.
Is veronal solution abuffer? Which of thecharacteristics describedabove helped you tomake the conclusion. Tasks forapplying theinformationHow many grams of glucose and water are required toprepare 750 g of 5.3 % (w/w) glucose solution? An intoxicated driver has a 0.2 v/v % alcohol in hisblood. How much alcohol is contained in the total 6 Lofblood for this individual? Aperson who consumes 800 ml of wine, which is 12 %(v/v) alcohol, has drunk how many milliliters of alcohol? Количеството на кръвта в организма е около 6,5 % оттеглото на човека. The label on the shampoo claims that it is pH balanced. What do you think ‘pH balanced’means? Aglasss of orange juice has [H3O+]= 2 x 10-4M. What isthe pH of the orange juice? Butyl ethanoate has asweet smell of bananas. Write an equation forthe formation of butylethanoate and explainthe process. Your task is to test a solution containing a concrementmade from salt composed of different anions. From yourtest results, you can identify the presence of certain an-ions. For example, if you found that in the anion testsyou got the same result as for Cl-, then the anion in yourconcrement sample would be Cl-. Take a small portion of your concrement sample and testsit (separately) for the presence of carbonates, oxalates andphosphates with the specic reaction described above. Why is milk given to someone who accidentally ingestsa heavy metal ion such as silver or mercury? Tasks foranalyzing theinformationBased on your knowledge for the carbonic-acid-bicarbo-nate buffer, draw the buffer curve for the acetic acid-sodi-um acetate bufferDraw and describe thebuffer curve for thebicarbonate bufferIn the lab three xatives are present- formalin, ethanoland acetic acid. Compare their properties as xativesand give examples of samples that can be preserved withthem. Draw the chemical equa-tion for the formation ofthe glycerophospholipidα-cephalin (phosphati-dylethanolamine). Identify the main com-ponents of the com-pound.
Tasks forevaluatingYou are supposed to prescribe a shampoo to a patient with seborrhea. Appraisewhich of the following shampoos are suitable for this disease and why! Explain theaction of the active ingredient to the patient. Shampoo 1 : Water, Ketoconazole, Water, Sodium Laureth Sulfate etc. Shampoo 2: Water, Ammonium Lauryl Sulfate, Panthenol, CitricAcid;Shampoo 3: Water, SalicylicAcid, Water, Cocamidopropyl BetaineShampoo 4: Water, Sodium laureth sulfate, sodium chloride, sodium benzoateShampoo 5: Water (Aqua), Sodium Laureth Sulfate, Punica Granatum extract, Gly-col Stearate;-Tasks forcreatingDenaturation of a protein occurs when certain conditions or agents disrupt the bondsthat hold - together the secondary or tertiary structures of a protein. Perform anexperimental procedure that illustrates the process of denaturation.

There were some limitations in development of assignments for evaluating and creating (Fig. 4) and it took not only time, but also expertise expansion. At last we decided to use this assignment as a project task, which students should prepare for the end of school year.

Inthecaseof pentobarbital(a weakacid) overdosetheurineshouldbe mademorealkalinewithsodiumbicarbonateinjectionandinthiswaytoincreasedrugexcretion. Theeffect ofpHchangeontubularre-absorptioncanbepredictedbyconsideration of drug pKa according to the Henderson-Hesselbalch equation.

Fig. 4. Assignment for evaluating and creating

Our program ensures that all students: (i) obtain hands-on experience with modern scientific instrumentation; (ii) enhance their ability to communicate knowledge inside and outside the classroom; (iii) receive mentorship from faculty with extensive realworld work experience.

Adaptation the didactic structure of the chemistry practice using a guideline

In order to improve clinical practice, the Committee for Practice Guidelines charges groups of European experts with the task of creating recommendations and guidelines for clinical practice. These recommendations and guidelines clarify areas of consensus and disagreement, allowing distribution of the best possible guidance to practicing physicians.

Guidelines aim to present all the relevant evidence on a particular clinical issue in order to help physicians to weigh the benefits and risks of a particular diagnostic or therapeutic procedure. They should be helpful in everyday clinical medical decision-making5.

Getting used to the work with guidelines may be hard if you don’t have an experience with it. Chemistry laboratory work is organized and always follows the rules of a guideline. The steps they have to follow are always the same. Here is an example.

Topic Amino Acids (Makedonski et al., 2013b)

1. Students’ work starts with filling out the Report sheet. Pre-Lab Study questions are answered and discussed.

Report Sheet-Lab 14Student Name……………………................................... Date:……………….…Student Group: ........................................... Instructor signature…………………... Pre-lab Study Questions1. What are the functional groups in all amino acids? 2. How does an R group determine if an amino acid is acidic, basic or nonpolar?

2. Goals of the practice are discussed first:

Goals:•Use R groups to determine if an amino acid will be acidic, basic, or neutral;hydrophobic or hydrophilic•Identify the structural pattern of proteins. •Observe the denaturation of proteins•Use chemical test to identify proteins and amino acids

3. The theory concerning the topic is discussed, usually students are in previous separated in groups and all the groups present their part of the text.

Discussion:A. Amino acidsIn our body, amino acids are used to build tissues, enzymes, skin, and hair. Abouthalf of the naturally occurring amino acids, the essential amino acids, must beobtained from the proteins in the diet because the body cannot synthesize them.
Amino acids are similar in structure because each has an amino group ( -NH2) anda carboxylic acid group ( -COOH). Individual amino acids have different organicgroups (R group) attached to the alpha carbon atom. Variations in the R-groupsdetermine whether an amino acid is hydrophilic or hydrophobic, and acidic, base, or neutral. AminoAcids Characteristic Titration CurvesTitration curves of amino acids are very useful for identication. As you can seein the example for glycine shown below, a simple amino acid has two dissociationsteps corresponding to loss of H+ from the acidic carboxyl group at low pHfollowed by loss of H+ from the more basic amino group at high pH. …B. Peptide BondsAdipeptide forms when two amino acids bond together. Apeptide (or amide) bondforms between the carboxylic acid of one amino acid and the amino group of thenext amino acid with the loss of H2O. …C. Structure of ProteinsWhen many amino acids are joined by peptide bonds they make a polypeptide. If more than 50 amino acids are in the peptide chain, it is usually considered tobe protein. Proteins make up many important features in the body including skin, muscle, cartilage, hair, ngernails, enzymes and hormones. …D. Denaturation of ProteinsDenaturation of a protein occurs when certain conditions or agents disrupt thebonds that hold together the secondary or tertiary structures of a protein. Proteinsare denatured with heat, acid, base, ethanol, tannic acid, and heavy metal ions(silver, lead, and mercury). …
E. ColorTests for ProteinsCertain tests give color products with amino acids, peptides, and/or proteins. Theresults of the test can be used to detect certain groups or type of bonds withinproteins or amino acidsBiuret test: The biuret test is positive for a peptide orprotein with two or more peptide bonds. …

4. The experimental procedures are explained by the instructor and students get ready for work

Experimental ProceduresA. AminoAcidsA.1. Using your textbook draws structures of glycerin and alanine. Convert thealanine model to a model of serine. Indicate whether each of the amino acids wouldbe hydrophobic or hydrophilic. …A.5. Titration:Place a sample of 25 ml glycine into a 100 ml beaker. Place thebeaker on the stirring hotplate, add a magnetic stir bar, and begin gentle stirrin. …B. Peptide BondsB.1. Using your textbook make models of glycine and serine. Form the dipeptidesglycylserine and serylglycine. Draw each of their structures. …C. Structure of ProteinsC.1. Know how to make a peptide bond from different amino acids. Be aware ofprotein Structure. …D. Denaturation of ProteinsAfresh egg albumin solution can be prepared by mixing the white from one eggwith 200 ml of water and ltering the mixture through cheesecloth into a beaker. …E. ColorTests for ProteinsE.1. Biuret test:In three separate test tubes, place 1 ml of solution of glycine, alanine , egg albumin. To each sample, add 1 ml of 10 % NaOH and stir. Then add2-3 drops of biuret reagent (5% CuSO4), and stir. Record …

5. Following the instructions students perform the experiment. Meanwhile questions concerning the results of the experiment are answered.

A5. Titration Curve of GlycineRecord all your results from the above experiment in the following chart:PointVolume NaOHpH1023…1750Plot pH versus ml of NaOH solution added. Use pH as the dependent variable(Y-axis) and mlof NaOH as the independent variable (X-axis)…. …D. Denaturation of ProteinsTreatmentObservation of eggalbuminExplanationD.1 HeatD.2AcidD.3 BaseD.4AlcoholD.5 Heavy metal ionsQuestions and ProblemsQ.1. Why is heat and alcohol used to disinfect medical equipment? E. ColorTests for ProteinsObservation of Color testsSampleE.1. BiuretE.2 NinhydrinE.3 XantoproteicGlycineAlanineEgg albumin
Questions and ProblemsQ.5. After working with HNO3, a student notices that she had a yellow spot on herhand. What might be the reason? …

The experimental procedure itself is complementary to the procedures physicians have to follow in certain cases. Use of imperative mood is preferred.

Place a sample of 25 ml glycine intoa 100 ml beaker. Place the beaker onthe stirring hotplate, add a magneticstir bar, and begin gentle stirring. Clamp the pH electrode to the ringstand with the tip submerged in thesolution in the 100 ml beaker. Besure the electrode is clear of themagnetic stir bar. Record the initial pH of yoursolution and the initial reading ofyour buret lled with 0.1 M NaOH(which should be 0.0 mL). …Continue this procedure until youreach pH 11.0 or have used 50 mLofNaOH solution. Write all your resultin a table. When measuring blood pressure, careshould be taken to:Allow the patient to sit for several minutesin a quiet room before beginning bloodpressure measurements. Take at least two measurements spaced by1-2 min, and additional measurements ifthe rst two are quite different. Use a standard bladder …Have the cuff at the heart level, whateverthe position of the patient. Use phase I and VKorotkoff soundsto identify systolic and diastolic bloodpressure, respectivelyMeasure blood pressure in both arm at rstvisit to detect possible differences …Measure blood pressure 1 and 5 min afterassumption of the standing position inelderly subjects, …Measure heart rate by pulse palpation (30s) after the second measurement in thesitting position. 6)

Perspective work

The context-based approach for control and assessment of chemical knowledge is applied in 2012/2013 academic year. These results and the results of 2013/2014 academic year about the change of students’ interest and progress will be analyzed in a further study. Development and implementation of context-based approach in all topics related to medical sciences is planned.

NOTES

1. http://www.mu-varna.bg/BG/Structure/Pharmacy/Pages/KatedrapoHimiq.aspx

2. http://undsci.berkeley.edu/teaching/

3. http://etd.uwc.ac.za/usrfiles/modules/etd/docs/etd_gen8Srv25Nme4_9855_1259928262.pdf

4. http://ww2.odu.edu/educ/roverbau/Bloom/blooms_taxonomy.htm

5. http://www.escardio.org/guidelines-surveys/esc-guidelines/about/Pages/presentation.aspx

6. http://www.dableducational.org/pdfs/esh_esc_guideline2003.pdf

REFERENCES

Ahmed, A.& Pollitt, A. (2007). Improving the quality of contextualized questions: an experimental investigation of focus. Assessment Education: Principles, Policy & Practice, 14, 201-232.

Ames, C. & Archer, J. (1988). Achievement goals in the classroom: students‘ learning strategies and motivation processes. J. Educ. Psychology, 3, 260-267.

Aschbacher, P.R. (1991). Performance assessment: state activity, interest and

concerns. Appl. Measurement Educ. , 4, 275-288.

Belt, S.T., Leisvik, M.J., Hyde, A.J. & Overton, T.L. (2005). Using a context-based approach to undergraduate chemistry teaching – a case study for introductory

physical chemistry. Chemistry Education: Research & Practice, 6, 166-179.

Gendjova, A. (2012). Chemistry education in context: challenges for prospective

teachers. Chemistry, 21, 807-817 [In Bulgarian].

Kotzé, G.S. (2003). The duality of coding assessment information. South African J. Education, 23, 338-344.

Makedonski, L., Peteva Z., Peycheva K. & Stancheva M. (2013a). Laboratory manual for teaching medical chemistry in English language course for the students of medicine and dental medicine. JAHR(Croatia), 4(7), 427-438).

Makedonski, L, Peycheva, K. & Stancheva, M. (2013b). Laboratory manual for general and organic chemistry, Varna: Steno.

Staver, J.R. (2007). Teaching science. Geneva: Educational Academy of Education.

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Z. Mateeva, E. Batchvarova, Z. Spasova, I. Ivanov, B. Kazakov, S. Matev, A. Simidchiev, A. Kitev

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MATHEMATICAL MODELLING OF THE TRANSMISSION MECHANISM OF PLAMODIUM FALCIPARUM

Onitilo S. A, Usman M. A., Daniel D. O. Odetunde O. S., Ogunwobi Z. O., Hammed F. A., Olubanwo O. O., Ajani A. S., Sanusi A. S., Haruna A. H.

ПОСТАНОВКА ЗА ИЗМЕРВАНЕ СКОРОСТТА НА ЗВУКА ВЪВ ВЪЗДУХ

Станислав Сланев, Хафизе Шабан, Шебнем Шабан, Анета Маринова

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MAGNETIC PROPERTIES

Sofija Blagojević, Lana Vujanović, Andreana Kovačević Ćurić

„TAP, TAP WATER“ QUANTUM TUNNELING DEMONSTRATION

Katarina Borković, Andreana Kovačević Ćurić

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КОМЕТИТЕ – I ЧАСТ

Пенчо Маркишки

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DISTANCE LEARNING: HOMEMADE COLLOIDAL SILVER

Ana Sofía Covarrubias-Montero, Jorge G. Ibanez

2021 година
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STUDY OF COMPOSITIONS FOR SELECTIVE WATER ISOLATION IN GAS WELLS

Al-Obaidi S.H., Hofmann M., Smirnov V.I., Khalaf F.H., Alwan H.H.

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POTENTIAL APPLICATIONS OF ANTIBACTERIAL COMPOUNDS IN EDIBLE COATING AS FISH PRESERVATIVE

Maulidan Firdaus, Desy Nila Rahmana, Diah Fitri Carolina, Nisrina Rahma Firdausi, Zulfaa Afiifah, Berlian Ayu Rismawati Sugiarto

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PROBLEM OF THE 8-TH EXPERIMENTAL PHYSICS OLYMPIAD, SKOPJE, 8 MAY 2021 DETERMINATION OF PLANCK CONSTANT BY LED

Todor M. Mishonov, Aleksander P. Petkov, Matteo Andreoni, Emil G. Petkov, Albert M. Varonov, Iglika M. Dimitrova, , Leonora Velkoska, Riste Popeski-Dimovski

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INVESTIGATION OF \(^{238}\)U, \(^{234}\)U AND \(^{210}\)PO CONTENT IN SELECTED BULGARIAN DRINKING WATER

Bozhidar Slavchev, Elena Geleva, Blagorodka Veleva, Hristo Protohristov, Lyuben Dobrev, Desislava Dimitrova, Vladimir Bashev, Dimitar Tonev

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DEMONSTRATION OF DAMPED ELECTRICAL OSCILLATIONS

Elena Grebenakova, Stojan Manolev

2020 година
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ДОЦ. Д-Р МАРЧЕЛ КОСТОВ КОСТОВ ЖИВОТ И ТВОРЧЕСТВО

Здравка Костова, Елена Георгиева

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JACOB’S LADDER FOR THE PHYSICS CLASSROOM

Kristijan Shishkoski, Vera Zoroska

COMPARATIVE PERFORMANCE AND DIGESTIBILITY OF NUTRIENTS IN AFSHARI AND GHEZEL RAM LAMBS

Morteza Karami, Fardis Fathizadeh, Arash Yadollahi, Mehran Aboozari, Yaser Rahimian, Reza Alipoor Filabadi

КАЛЦИЙ, ФОСФОР И ДРУГИ ФАКТОРИ ЗА КОСТНО ЗДРАВЕ

Радка Томова, Светла Асенова, Павлина Косева

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THE DAY OF THE INDUCTANCE: PROBLEMS OF THE 7\(^{TH}\) EXPERIMENTAL PHYSICS OLYMPIAD, SKOPJE, 2019

Todor M. Mishonov, Riste Popeski-Dimovski, Leonora Velkoska, Iglika M. Dimitrova, Vassil N. Gourev, Aleksander P. Petkov, Emil G. Petkov, Albert M. Varonov

MATHEMATICAL MODELING OF 2019 NOVEL CORONAVIRUS (2019 – NCOV) PANDEMIC IN NIGERIA

Sefiu A. Onitilo, Mustapha A. Usman, Olutunde S. Odetunde, Fatai A. Hammed, Zacheous O. Ogunwobi, Hammed A. Haruna, Deborah O. Daniel

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МОЛЕКУЛИТЕ НА УДОВОЛСТВИЕТО

Веселина Янкова, Снежана Демирова, Цветанка Митева, Явор Князов, Христо Желев, Димитър Георгиев, Габриела Стоянова

WATER PURIFICATION WITH LASER RADIATION

Lyubomir Lazov, Hristina Deneva, Galina Gencheva

2019 година
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LASER MICRO-PERFORATION AND FIELDS OF APPLICATION

Hristina Deneva, Lyubomir Lazov, Edmunds Teirumnieks

ПРИЛОЖНА ФОТОНИКА И АНТИОКСИДАНТНИ СВОЙСТВА НА ВИСОКООЛЕИНОВО СЛЪНЧОГЛЕДОВО МАСЛО С БИЛКОВИ ПРИМЕСИ

Кръстена Николова, Стефка Минкова, Поли Радушева, Георги Бошев, Еркан Фаридин, Нурал Джамбазов, Мариана Перифанова-Немска

ПРОЦЕСЪТ ДИФУЗИЯ – ОСНОВА НА ДИАЛИЗАТА

Берна Сабит, Джемиле Дервиш, Мая Никова, Йорданка Енева

IN VITRO EVALUATION OF THE ANTIOXIDANT PROPERTIES OF OLIVE LEAF EXTRACTS – CAPSULES VERSUS POWDER

Hugo Saint-James, Gergana Bekova, Zhanina Guberkova, Nadya Hristova-Avakumova, Liliya Atanasova, Svobodan Alexandrov, Trayko Traykov, Vera Hadjimitova

2019 − THE INTERNATIONAL YEAR OF THE PERIODIC TABLE OF CHEMICAL ELEMENTS

Maria Atanassova, Radoslav Angelov, Dessislava Gerginova, Alexander Zahariev

ТЕХНОЛОГИЯ

Б. В. Тошев

Книжка 5
ЗЕЛЕНА ХИМИЯ В УЧИЛИЩНАТА ЛАБОРАТОРИЯ

Александрия Генджова, Мая Тавлинова-Кирилова, Александра Камушева

ON THE GENETIC TIES BETWEEN EUROPEAN NATIONS

Jordan Tabov, Nevena Sabeva-Koleva, Georgi Gachev

CAN BRING PEOPLE TOGETHER

Nadya Kantareva-Baruh

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CHEMOMETRIC ANALYSIS OF SCHOOL LIFE IN VARNA

Radka Tomova, Petinka Galcheva, Ivajlo Trajkov, Antoaneta Hineva, Stela Grigorova, Rumyana Slavova, 6Miglena Slavova

ЦИКЛИТЕ НА КРЕБС

Ивелин Кулев

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ПРИНЦИПИТЕ НА КАРИЕРНОТО РАЗВИТИЕ НА МЛАДИЯ УЧЕН

И. Панчева, М. Недялкова, С. Кирилова, П. Петков, В. Симеонов

UTILISATION OF THE STATIC EVANS METHOD TO MEASURE MAGNETIC SUSCEPTIBILITIES OF TRANSITION METAL ACETYLACETONATE COMPLEXES AS PART OF AN UNDERGRADUATE INORGANIC LABORATORY CLASS

Anton Dobzhenetskiy, Callum A. Gater, Alexander T. M. Wilcock, Stuart K. Langley, Rachel M. Brignall, David C. Williamson, Ryan E. Mewis

A TALE OF SEVEN SCIENTISTS

Savina Kirilova

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DEVELOPMENT OF A LESSON PLAN ON THE TEACHING OF MODULE “WATER CONDUCTIVITY”

A. Thysiadou, S. Christoforidis, P. Giannakoudakis

AMPEROMETRIC NITRIC OXIDE SENSOR BASED ON MWCNT CHROMIUM(III) OXIDE NANOCOMPOSITE

Arsim Maloku, Epir Qeriqi, Liridon S. Berisha, Ilir Mazreku, Tahir Arbneshi, Kurt Kalcher

THE EFFECT OF AGING TIME ON Mg/Al HYDROTALCITES STRUCTURES

Eddy Heraldy, Triyono, Sri Juari Santosa, Karna Wijaya, Shogo Shimazu

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A CONTENT ANALYSIS OF THE RESULTS FROM THE STATE MATRICULATION EXAMINATION IN MATHEMATICS

Elena Karashtranova, Nikolay Karashtranov, Vladimir Vladimirov

SOME CONCEPTS FROM PROBABILITY AND STATISTICS AND OPPORTUNITIES TO INTEGRATE THEM IN TEACHING NATURAL SCIENCES

Elena Karashtranova, Nikolay Karashtranov, Nadezhda Borisova, Dafina Kostadinova

45. МЕЖДУНАРОДНА ОЛИМПИАДА ПО ХИМИЯ

Донка Ташева, Пенка Василева

2018 година
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ЗДРАВЕ И ОКОЛНА СРЕДА

Кадрие Шукри, Светлана Великова, Едис Мехмед

РОБОТИКА ЗА НАЧИНАЕЩИ ЕНТУСИАСТИ

Даниела Узунова, Борис Велковски, Илко Симеонов, Владислав Шабански, Димитър Колев

DESIGN AND DOCKING STUDIES OF HIS-LEU ANALOGUES AS POTENTIOAL ACE INHIBITORS

Rumen Georgiev, , Tatyana Dzimbova, Atanas Chapkanov

ELECTROCHEMICAL IMPEDANCE STUDY OF BSCCO (2212) CUPRATE CERAMIC ADDITIVE TO THE ZINC ELECTRODE IN Ni-Zn BATTERIES

A. Vasev, P. Lilov, G. Ivanova, Y. Marinov, A. Stoyanova, V. Mikli, A. Stoyanova-Ivanova

CALIBRATION OF GC/MS METHOD FOR DETERMINATION OF PHTHALATES

N. Dineva, I. Givechev, D. Tanev, D. Danalev

SONOCHEMICAL SYNTHESIS OF 4-AMINOANTIPYRINE SCHIFF BASES A ND EVALUATION OF THEIR ANTIMICROBIAL, ANTI-TYROSINASE AND DPPH SCAVENGING ACTIVITIES

Maya Chochkova, Boyka Stoykova, Iva Romanova, Petranka Petrova, Iva Tsvetkova, Hristo Najdenski, Lubomira Nikolaeva- Glomb, Nadya Nikolova, Galya Ivanova, Atanas Chapkanov, Tsenka Milkova, Martin Štícha, Ivan Nemec

ELECTROSYNTHESIS OF CADMIUM SELENIDE NANOPARTICLES WITH SIMULTANEOUS EXTRACTION INTO P-XYLENE

S. S. Fomanyuk, V. O. Smilyk, G. Y. Kolbasov, I. A. Rusetskyi, T. A. Mirnaya

БИОЛОГИЧЕН АСПЕКТ НА РЕКАНАЛИЗАЦИЯ С ВЕНОЗНА ТРОМБОЛИЗА

Мариела Филипова, Даниела Попова, Стоян Везенков

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ИМОБИЛИЗИРАНЕНАФРУКТОЗИЛТРАНСФЕРАЗА ВЪРХУКОМПОЗИТНИФИЛМИОТПОЛИМЛЕЧНА КИСЕЛИНА, КСАНТАН И ХИТОЗАН

Илия Илиев, Тонка Василева, Веселин Биволарски, Ася Виранева, Иван Бодуров, Мария Марудова, Теменужка Йовчева

ELECTRICAL IMPEDANCE SPECTROSCOPY OF GRAPHENE-E7 LIQUID-CRYSTAL NANOCOMPOSITE

Todor Vlakhov, Yordan Marinov, Georgi. Hadjichristov, Alexander Petrov

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

Dragomir Gospodinov, Delko Zlatanski, Boyko Ranguelov, Alexander Kandilarov

RHEOLOGICAL PROPERTIES OF BATTER FOR GLUTEN FREE BREAD

G. Zsivanovits, D. Iserliyska, M. Momchilova, M. Marudova

ПОЛУЧАВАНЕ НА ПОЛИЕЛЕКТРОЛИТНИ КОМПЛЕКСИ ОТ ХИТОЗАН И КАЗЕИН

Антоанета Маринова, Теменужка Йовчева, Ася Виранева, Иван Бодуров, Мария Марудова

CHEMILUMINESCENT AND PHOTOMETRIC DETERMINATION OF THE ANTIOXIDANT ACTIVITY OF COCOON EXTRACTS

Y. Evtimova, V. Mihailova, L. A. Atanasova, N. G. Hristova-Avakumova, M. V. Panayotov, V. A. Hadjimitova

ИЗСЛЕДОВАТЕЛСКИ ПРАКТИКУМ

Ивелина Димитрова, Гошо Гоев, Савина Георгиева, Цвета Цанова, Любомира Иванова, Борислав Георгиев

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PARAMETRIC INTERACTION OF OPTICAL PULSES IN NONLINEAR ISOTROPIC MEDIUM

A. Dakova, V. Slavchev, D. Dakova, L. Kovachev

ДЕЙСТВИЕ НА ГАМА-ЛЪЧИТЕ ВЪРХУ ДЕЗОКСИРИБОНУКЛЕИНОВАТА КИСЕЛИНА

Мирела Вачева, Хари Стефанов, Йоана Гвоздейкова, Йорданка Енева

RADIATION PROTECTION

Natasha Ivanova, Bistra Manusheva

СРАВНИТЕЛЕН АНАЛИЗ НА СЪДЪРЖАЩИТЕ СЕ ЕСТЕСТВЕНИ РАДИОНУКЛИДИ В НЕВЕН И ЛАЙКА

Сияна Димова, Цветелина Стефанова, Йорданка Енева, Нина Архангелова

СТАБИЛНОСТ НА ЕМУЛСИИ ОТ ТИПА МАСЛО/ ВОДА С КОНЮГИРАНА ЛИНОЛОВА КИСЕЛИНА

И. Милкова-Томова, Д. Бухалова, К. Николова, И. Алексиева, И. Минчев, Г. Рунтолев

THE EFFECT OF EXTRA VIRGIN OLIVE OIL ON THE HUMAN BODY AND QUALITY CONTROL BY USING OPTICAL METHODS

Carsten Tottmann, Valentin Hedderich, Poli Radusheva, Krastena Nikolova

ИНФРАЧЕРВЕНА ТЕРМОГРАФИЯ ЗА ДИАГНОСТИКА НА ФОКАЛНА ИНФЕКЦИЯ

Рая Грозданова-Узунова, Тодор Узунов, Пепа Узунова

ЕКСПЕРИМЕНТЪТ ПО ПРИЛОЖНА ФИЗИКА И НЕГОВАТА РОЛЯ ПРИ УСВОЯВАНЕТО НА ПРАКТИКО-ПРИЛОЖНИТЕ ЗНАНИЯ ОТ КУРСАНТИТЕ И СТУДЕНТИТЕ

Николай Тодоров Долчинков, Бонка Енчева Караиванова-Долчинкова, Nikolay Dolchinkov, Bonka Karaivanova-Dolchinkova

ЕЛЕКТРИЧНИ СВОЙСТВА НА КОМПОЗИТНИ ФИЛМИ ОТ ПОЛИМЛЕЧНА КИСЕЛИНА

Ася Виранева, Иван Бодуров, Теменужка Йовчева

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PHYSICS IS AN EVER YOUNG SCIENCE

Temenuzhka Yovcheva

ТРИ ИДЕИ ЗА ЕФЕКТИВНО ОБУЧЕНИЕ

Гергана Карафезиева

МАГИЯТА НА ТВОРЧЕСТВОТО КАТО ПЪТ НА ЕСТЕСТВЕНО УЧЕНЕ В УЧЕБНИЯ ПРОЦЕС

Гергана Добрева, Жаклин Жекова, Михаела Чонос

ОБУЧЕНИЕ ПО ПРИРОДНИ НАУКИ ЧРЕЗ МИСЛОВНИ КАРТИ

Виолета Стоянова, Павлина Георгиева

ИГРА НА ДОМИНО В ЧАС ПО ФИЗИКА

Росица Кичукова, Ценка Маринова

ТЪМНАТА МАТЕРИЯ В КЛАСНАТА СТАЯ

Симона Стоянова, Анета Маринова

ПРОБЛЕМИ ПРИ ОБУЧЕНИЕТО ПО ФИЗИКА ВЪВ ВВМУ „Н. Й. ВАПЦАРОВ“

А. Христова, Г. Вангелов, И. Ташев, М. Димидов

ИЗГРАЖДАНЕ НА СИСТЕМА ОТ УЧЕБНИ ИНТЕРНЕТ РЕСУРСИ ПО ФИЗИКА И ОЦЕНКА НА ДИДАКТИЧЕСКАТА ИМ СТОЙНОСТ

Желязка Райкова, Георги Вулджев, Наталия Монева, Нели Комсалова, Айше Наби

ИНОВАЦИИ В БОРБАТА С ТУМОРНИ ОБРАЗУВАНИЯ – ЛЕЧЕНИЕ ЧРЕЗ БРАХИТЕРАПИЯ

Георги Върбанов, Радостин Михайлов, Деница Симеонова, Йорданка Енева

NATURAL RADIONUCLIDES IN DRINKING WATER

Natasha Ivanova, Bistra Manusheva

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АДАПТИРАНЕ НА ОБРАЗОВАНИЕТО ДНЕС ЗА УТРЕШНИЯ ДЕН

И. Панчева, М. Недялкова, П. Петков, Х. Александров, В. Симеонов

INTEGRATED ENGINEERING EDUCATION: THE ROLE OF ANALYSIS OF STUDENTS’ NEEDS

Veselina Kolarski, Dancho Danalev, Senia Terzieva

Книжка 1
ZAGREB CONNECTION INDICES OF \(\mathrm{TiO}_{2}\) NANOTUBES

Sohaib Khalid, Johan Kok, Akbar Ali, Mohsin Bashir

SYNTHESIS OF NEW 3-[(CHROMEN-3-YL) ETHYLIDENEAMINO] -PHENYL] -THIAZOLIDIN-4ONES AND THEIR ANTIBACTERIAL ACTIVITY

Ramiz Hoti, Naser Troni, Hamit Ismaili, Malesore Pllana, Musaj Pacarizi, Veprim Thaçi, Gjyle Mulliqi-Osmani

2017 година
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GEOECOLOGICAL ANALYSIS OF INDUSTRIAL CITIES: ON THE EXAMPLE OF AKTOBE AGGLOMERATION

Zharas Berdenov, Erbolat Mendibaev, Talgat Salihov, Kazhmurat Akhmedenov, Gulshat Ataeva

TECHNOGENESIS OF GEOECOLOGICAL SYSTEMS OF NORTHEN KAZAKHSTAN: PROGRESS, DEVELOPMENT AND EVOLUTION

Kulchichan Dzhanaleyeva, Gulnur Mazhitova, Altyn Zhanguzhina, Zharas Berdenov, Tursynkul Bazarbayeva, Emin Atasoy

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47-А НАЦИОНАЛНА КОНФЕРЕНЦИЯ НА УЧИТЕЛИТЕ ПО ХИМИЯ

В последните години тези традиционни за българското учителство конфе- ренции се организират от Българското дружество по химическо образование и история и философия на химията. То е асоцииран член на Съюза на химици- те в България, който пък е член на Европейската асоциация на химическите и

SYNTHESIS OF TiO 2-M (Cd, Co, Mn) AS A PHOTOCATALYST DEGRADATION OF METHYLENE BLUE DYE

Candra Purnawan, Sayekti Wahyuningsih, Dwita Nur Aisyah

EFFECT OF DIFFERENT CADMIUM CONCENTRATION ON SOME BIOCHEMICAL PARAMETERS IN ‘ISA BROWN’ HYBRID CHICKEN

Imer Haziri, Adem Rama, Fatgzim Latifi, Dorjana Beqiraj-Kalamishi, Ibrahim Mehmeti, Arben Haziri

PHYTOCHEMICAL AND <i>IN VITRO</i> ANTIOXIDANT STUDIES OF <i>PRIMULA VERIS</i> (L.) GROWING WILD IN KOSOVO

Ibrahim Rudhani, Florentina Raci, Hamide Ibrahimi, Arben Mehmeti, Ariana Kameri, Fatmir Faiku, Majlinda Daci, Sevdije Govori, Arben Haziri

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„СИМВОЛНИЯТ КАПИТАЛ“ НА БЪЛГАРСКОТО УЧИЛИЩЕ

Николай Цанков, Веска Гювийска

KINETICS OF PHOTO-ELECTRO-ASSISTED DEGRADATION OF REMAZOL RED 5B

Fitria Rahmawati, Tri Martini, Nina Iswati

ALLELOPATHIC AND IN VITRO ANTICANCER ACTIVITY OF STEVIA AND CHIA

Asya Dragoeva, Vanya Koleva, Zheni Stoyanova, Eli Zayova, Selime Ali

NOVEL HETEROARYLAMINO-CHROMEN-2-ONES AND THEIR ANTIBACTERIAL ACTIVITY

Ramiz Hoti, Naser Troni, Hamit Ismaili, Gjyle Mulliqi-Osmani, Veprim Thaçi

Книжка 3
OPTIMIZATION OF ENGINE OIL FORMULATION USING RESPONSE SURFACE METHODOLOGY AND GENETIC ALGORITHM: A COMPARATIVE STUDY

Behnaz Azmoon, Abolfazl Semnani, Ramin Jaberzadeh Ansari, Hamid Shakoori Langeroodi, Mahboube Shirani, Shima Ghanavati Nasab

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

Farheen Sami, Shahnaz Majeed, Tengku Azlan Shah Tengku Mohammed, Noor Fatin Amalina Kamaruddin, Mohammad Zulhimi Atan, Syed Amir Javid Bukhari, Namra, Bushra Hasan, Mohammed Tahir Ansari

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

Arben Haziri, Fatmir Faiku, Roze Berisha, Ibrahim Mehmeti, Sevdije Govori, Imer Haziri

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ПРИРОДОНАУЧНАТА ГРАМОТНОСТ НА УЧЕНИЦИТЕ В НАЧАЛОТО НА XXI ВЕК – В ТЪРСЕНЕ НА КОНЦЕПТУАЛНО ЕДИНСТВО

Теодора Коларова, Иса Хаджиали, Мимия Докова, Веселин Александров

COMPUTER SIMULATORS: APPLICATION FOR GRADUATES’ADAPTATION AT OIL AND GAS REFINERIES

Irena O. Dolganova, Igor M. Dolganov, Kseniya A. Vasyuchka

SYNTHESIS OF NEW [(3-NITRO-2-OXO-2H-CHROMEN4-YLAMINO) -PHENYL] -PHENYL-TRIAZOLIDIN-4-ONES AND THEIR ANTIBACTERIAL ACTIVITY

Ramiz Hoti, Hamit Ismaili, Idriz Vehapi, Naser Troni, Gjyle Mulliqi-Osmani, Veprim Thaçi

STABILITY OF RJ-5 FUEL

Lemi Türker, Serhat Variş

A STUDY OF BEGLIKTASH MEGALITHIC COMPLEX

Diana Kjurkchieva, Evgeni Stoykov, Sabin Ivanov, Borislav Borisov, Hristo Hristov, Pencho Kyurkchiev, Dimitar Vladev, Irina Ivanova

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2016 година
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THE EFFECT OF KOH AND KCL ADDITION TO THE DESTILATION OF ETHANOL-WATER MIXTURE

Khoirina Dwi Nugrahaningtyas, Fitria Rahmawati, Avrina Kumalasari

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VOLTAMMERIC SENSOR FOR NITROPHENOLS BASED ON SCREEN-PRINTED ELECTRODE MODIFIED WITH REDUCED GRAPHENE OXIDE

Arsim Maloku, Liridon S. Berisha, Granit Jashari, Eduard Andoni, Tahir Arbneshi

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ИЗСЛЕДВАНЕ НА ПРОФЕСИОНАЛНО-ПЕДАГОГИЧЕСКАТА РЕФЛЕКСИЯ НА УЧИТЕЛЯ ПО БИОЛОГИЯ (ЧАСТ ВТОРА)

Надежда Райчева, Иса Хаджиали, Наташа Цанова, Виктория Нечева

EXISTING NATURE OF SCIENCE TEACHING OF A THAI IN-SERVICE BIOLOGY TEACHER

Wimol Sumranwanich, Sitthipon Art-in, Panee Maneechom, Chokchai Yuenyong

NUTRIENT COMPOSITION OF CUCURBITA MELO GROWING IN KOSOVO

Fatmir Faiku, Arben Haziri, Fatbardh Gashi, Naser Troni

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CONTEXT-BASED CHEMISTRY LAB WORK WITH THE USE OF COMPUTER-ASSISTED LEARNING SYSTEM

N. Y. Stozhko, A. V. Tchernysheva, E.M. Podshivalova, B.I. Bortnik

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ПО ПЪТЯ ON THE ROAD

Б. В. Тошев

INTERDISCIPLINARY PROJECT FOR ENHANCING STUDENTS’ INTEREST IN CHEMISTRY

Stela Georgieva, Petar Todorov, Zlatina Genova, Petia Peneva

2015 година
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COMPLEX SYSTEMS FOR DRUG TRANSPORT ACROSS CELL MEMBRANES

Nikoleta Ivanova, Yana Tsoneva, Nina Ilkova, Anela Ivanova

SURFACE FUNCTIONALIZATION OF SILICA SOL-GEL MICROPARTICLES WITH EUROPIUM COMPLEXES

Nina Danchova, Gulay Ahmed, Michael Bredol, Stoyan Gutzov

INTERFACIAL REORGANIZATION OF MOLECULAR ASSEMBLIES USED AS DRUG DELIVERY SYSTEMS

I. Panaiotov, Tz. Ivanova, K. Balashev, N. Grozev, I. Minkov, K. Mircheva

KINETICS OF THE OSMOTIC PROCESS AND THE POLARIZATION EFFECT

Boryan P. Radoev, Ivan L. Minkov, Emil D. Manev

WETTING BEHAVIOR OF A NATURAL AND A SYNTHETIC THERAPEUTIC PULMONARY SURFACTANTS

Lidia Alexandrova, Michail Nedyalkov, Dimo Platikanov

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TEACHER’S ACCEPTANCE OF STUDENTS WITH DISABILITY

Daniela Dimitrova-Radojchikj, Natasha Chichevska-Jovanova

APPLICATION OF LASER INDUCED BREAKDOWN SPECTROSCOPY AS NONDESDUCTRIVE AND SAFE ANALYSIS METHOD FOR COMPOSITE SOLID PROPELLANTS

Amir Hossein Farhadian, Masoud Kavosh Tehrani, Mohammad Hossein Keshavarz, Seyyed Mohamad Reza Darbany, Mehran Karimi, Amir Hossein Rezayi

THE EFFECT OF DIOCTYLPHTHALATE ON INITIAL PROPERTIES AND FIELD PERFORMANCE OF SOME SEMISYNTHETIC ENGINE OILS

Azadeh Ghasemizadeh, Abolfazl Semnani, Hamid Shakoori Langeroodi, Alireza Nezamzade Ejhieh

QUALITY ASSESSMENT OF RIVER’S WATER OF LUMBARDHI PEJA (KOSOVO)

Fatmir Faiku, Arben Haziri, Fatbardh Gashi, Naser Troni

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БЛАГОДАРЯ ВИ!

Александър Панайотов

ТЕМАТА ВЪГЛЕХИДРАТИ В ПРОГРАМИТЕ ПО ХИМИЯ И БИОЛОГИЯ

Радка Томова, Елена Бояджиева, Миглена Славова, Мариан Николов

BILINGUAL COURSE IN BIOTECHNOLOGY: INTERDISCIPLINARY MODEL1)

V. Kolarski, D. Marinkova, R. Raykova, D. Danalev, S. Terzieva

ХИМИЧНИЯТ ОПИТ – НАУКА И ЗАБАВА

Елица Чорбаджийска, Величка Димитрова, Магдалена Шекерлийска, Галина Бальова, Методийка Ангелова

ЕКОЛОГИЯТА В БЪЛГАРИЯ

Здравка Костова

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SYNTHESIS OF FLUORINATED HYDROXYCINNAMOYL DERIVATIVES OF ANTI-INFLUENZA DRUGS AND THEIR BIOLOGICAL ACTIVITY

Boyka Stoykova, Maya Chochkova, Galya Ivanova, Luchia Mukova, Nadya Nikolova, Lubomira Nikolaeva-Glomb, Pavel Vojtíšek, Tsenka Milkova, Martin Štícha, David Havlíček

SYNTHESIS AND ANTIVIRAL ACTIVITY OF SOME AMINO ACIDS DERIVATIVES OF INFLUENZA VIRUS DRUGS

Radoslav Chayrov, Vesela Veselinova, Vasilka Markova, Luchia Mukova, Angel Galabov, Ivanka Stankova

NEW DERIVATIVES OF OSELTAMIVIR WITH BILE ACIDS

Kiril Chuchkov, Silvia Nakova, Lucia Mukova, Angel Galabov, Ivanka Stankova

MONOHYDROXY FLAVONES. PART III: THE MULLIKEN ANALYSIS

Maria Vakarelska-Popovska, Zhivko Velkov

LEU-ARG ANALOGUES: SYNTHESIS, IR CHARACTERIZATION AND DOCKING STUDIES

Tatyana Dzimbova, Atanas Chapkanov, Tamara Pajpanova

LACTOBACILLUS PLANTARUM AC 11S AS A BIOCATALYST IN MICROBIAL ELECYTOLYSIS CELL

Elitsa Chorbadzhiyska, Yolina Hubenova, Sophia Yankova, Dragomir Yankov, Mario Mitov

STUDYING THE PROCESS OF DEPOSITION OF ANTIMONY WITH CALCIUM CARBONATE

K. B. Omarov, Z. B. Absat, S. K. Aldabergenova, A. B. Siyazova, N. J. Rakhimzhanova, Z. B. Sagindykova

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TEACHING CHEMISTRY AT TECHNICAL UNIVERSITY

Lilyana Nacheva-Skopalik, Milena Koleva

ФОРМИРАЩО ОЦЕНЯВАНЕ PEER INSTRUCTION С ПОМОЩТА НА PLICКERS ТЕХНОЛОГИЯТА

Ивелина Коцева, Мая Гайдарова, Галина Ненчева

VAPOR PRESSURES OF 1-BUTANOL OVER WIDE RANGE OF THEMPERATURES

Javid Safarov, Bahruz Ahmadov, Saleh Mirzayev, Astan Shahverdiyev, Egon Hassel

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РУМЕН ЛЮБОМИРОВ ДОЙЧЕВ (1938 – 1999)

Огнян Димитров, Здравка Костова

NAMING OF CHEMICAL ELEMENTS

Maria Atanassova

2014 година
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LUBRICATION PROPERTIES OF DIFFERENT PENTAERYTHRITOL-OLEIC ACID REACTION PRODUCTS

Abolfazl Semnani, Hamid Shakoori Langeroodi, Mahboube Shirani

ALLELOPATHIC AND CYTOTOXIC ACTIVITY OF ORIGANUM VULGARE SSP. VULGARE GROWING WILD IN BULGARIA

Asya Pencheva Dragoeva, Vanya Petrova Koleva, Zheni Dimitrova Nanova, Mariya Zhivkova Kaschieva, Irina Rumenova Yotova

Книжка 5
GENDER ISSUES OF UKRAINIAN HIGHER EDUCATION

Н.H.Petruchenia, M.I.Vorovka

МНОГОВАРИАЦИОННА СТАТИСТИЧЕСКА ОЦЕНКА НА DREEM – БЪЛГАРИЯ: ВЪЗПРИЕМАНЕ НА ОБРАЗОВАТЕЛНАТА СРЕДА ОТ СТУДЕНТИТЕ В МЕДИЦИНСКИЯ УНИВЕРСИТЕТ – СОФИЯ

Радка Томова, Павлина Гатева, Радка Хаджиолова, Зафер Сабит, Миглена Славова, Гергана Чергарова, Васил Симеонов

MUSSEL BIOADHESIVES: A TOP LESSON FROM NATURE

Saâd Moulay Université Saâd Dahlab de Blida, Algeria

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ЕЛЕКТРОННО ПОМАГАЛO „ОТ АТОМА ДО КОСМОСА“ ЗА УЧЕНИЦИ ОТ Х КЛАС

Силвия Боянова Професионална гимназия „Акад. Сергей П. Корольов“ – Дупница

ЕСЕТО КАТО ИНТЕГРАТИВЕН КОНСТРУКТ – НОРМАТИВЕН, ПРОЦЕСУАЛЕН И ОЦЕНЪЧНО-РЕЗУЛТАТИВЕН АСПЕКТ

Надежда Райчева, Иван Капурдов, Наташа Цанова, Иса Хаджиали, Снежана Томова

44<sup>-ТA</sup> МЕЖДУНАРОДНА ОЛИМПИАДА ПО ХИМИЯ

Донка Ташева, Пенка Василева

ДОЦ. Д.П.Н. АЛЕКСАНДЪР АТАНАСОВ ПАНАЙОТОВ

Наташа Цанова, Иса Хаджиали, Надежда Райчева

COMPUTER ASSISTED LEARNING SYSTEM FOR STUDYING ANALYTICAL CHEMISTRY

N. Y. Stozhko, A. V. Tchernysheva, L.I. Mironova

С РАКЕТНА ГРАНАТА КЪМ МЕСЕЦА: БОРБА С ЕДНА ЛЕДЕНА ЕПОХА В ГОДИНАТА 3000 СЛЕД ХРИСТА. 3.

С РАКЕТНА ГРАНАТА КЪМ МЕСЕЦА:, БОРБА С ЕДНА ЛЕДЕНА ЕПОХА, В ГОДИНАТА 000 СЛЕД ХРИСТА. .

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ВИСША МАТЕМАТИКА ЗА УЧИТЕЛИ, УЧЕНИЦИ И СТУДЕНТИ: ДИФЕРЕНЦИАЛНО СМЯТАНЕ

Б. В. Тошев Българско дружество за химическо образование и история и философия на химията

ВАСИЛ ХРИСТОВ БОЗАРОВ

Пенка Бозарова, Здравка Костова

ЖИВАТА ПРИРОДА

Б. В. Тошев

БИБЛИОГРАФИЯ НА СТАТИИ ЗА МИСКОНЦЕПЦИИТЕ В ОБУЧЕНИЕТО ПО ПРИРОДНИ НАУКИ ВЪВ ВСИЧКИ ОБРАЗОВАТЕЛНИ НИВА

Б. В. Тошев Българско дружество за химическо образование и история и философия на химията

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BOTYU ATANASSOV BOTEV

Zdravka Kostova, Margarita Topashka-Ancheva

CHRONOLOGY OF CHEMICAL ELEMENTS DISCOVERIES

Maria Atanassova, Radoslav Angelov

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КАК ДА МОТИВИРАМЕ УЧЕНИЦИТЕ OT VII КЛАС ДА УЧАТ

Маргарита Бозова, Петко Бозов

ОБРАЗОВАНИЕ ЗА ПРИРОДОНАУЧНА ГРАМОТНОСТ

Адриана Тафрова-Григорова

2013 година
Книжка 6
DIFFERENTIAL TEACHING IN SCHOOL SCIENCE EDUCATION: CONCEPTUAL PRINCIPLES

G. Yuzbasheva Kherson Academy of Continuing Education, Ukraine

АНАЛИЗ НА ПОСТИЖЕНИЯТА НА УЧЕНИЦИТЕ ОТ ШЕСТИ КЛАС ВЪРХУ РАЗДЕЛ „ВЕЩЕСТВА И ТЕХНИТЕ СВОЙСТВА“ ПО „ЧОВЕКЪТ И ПРИРОДАТА“

Иваничка Буровска, Стефан Цаковски Регионален инспекторат по образованието – Ловеч

HISTORY AND PHILOSOPHY OF SCIENCE: SOME RECENT PERIODICALS (2013)

Chemistry: Bulgarian Journal of Science Education

45. НАЦИОНАЛНА КОНФЕРЕНЦИЯ НА УЧИТЕЛИТЕ ПО ХИМИЯ

„Образователни стандарти и природонаучна грамотност“ – това е темата на състоялата се от 25 до 27 октомври 2013 г. в Габрово 45. Национална конфе- ренция на учителите по химия с международно участие, която по традиция се проведе комбинирано с Годишната конференция на Българското дружество за химическо образование и история и философия на химията. Изборът на темата е предизвикан от факта, че развиването на природонаучна грамотност е обща тенденция на реформите на учебните програми и главна

Книжка 5

ЗА ХИМИЯТА НА БИРАТА

Ивелин Кулев

МЕТЕОРИТЪТ ОТ БЕЛОГРАДЧИК

Б. В. Тошев Българско дружество за химическо образование и история и философия на химията

Книжка 4
RECASTING THE DERIVATION OF THE CLAPEYRON EQUATION INTO A CONCEPTUALLY SIMPLER FORM

Srihari Murthy Meenakshi Sundararajan Engineering College, India

CHEMICAL REACTIONS DO NOT ALWAYS MODERATE CHANGES IN CONCENTRATION OF AN ACTIVE COMPONENT

Joan J. Solaz-Portolés, Vicent Sanjosé Universitat de Valènciа, Spain

POLYMETALLIC COMPEXES: CV. SYNTHESIS, SPECTRAL, THERMOGRAVIMETRIC, XRD, MOLECULAR MODELLING AND POTENTIAL ANTIBACTERIAL PROPERTIES OF TETRAMERIC COMPLEXES OF Co(II), Ni(II), Cu(II), Zn(II), Cd(II) AND Hg(II) WITH OCTADENTATE AZODYE LIGANDS

Bipin B. Mahapatra, S. N. Dehury, A. K. Sarangi, S. N. Chaulia G. M. Autonomous College, India Covt. College of Engineering Kalahandi, India DAV Junior College, India

ПРОФЕСОР ЕЛЕНА КИРКОВА НАВЪРШИ 90 ГОДИНИ

CELEBRATING 90TH ANNIVERSARY OF PROFESSOR ELENA KIRKOVA

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SIMULATION OF THE FATTY ACID SYNTHASE COMPLEX MECHANISM OF ACTION

M.E.A. Mohammed, Ali Abeer, Fatima Elsamani, O.M. Elsheikh, Abdulrizak Hodow, O. Khamis Haji

FORMING OF CONTENT OF DIFFERENTIAL TEACHING OF CHEMISTRY IN SCHOOL EDUCATION OF UKRAINE

G. Yuzbasheva Kherson Academy of Continuing Education, Ukraine

ИЗСЛЕДВАНЕ НА РАДИКАЛ-УЛАВЯЩА СПОСОБНОСТ

Станислав Станимиров, Живко Велков

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COLORFUL EXPERIMENTS FOR STUDENTS: SYNTHESIS OF INDIGO AND DERIVATIVES

Vanessa BIANDA, Jos-Antonio CONSTENLA, Rolf HAUBRICHS, Pierre-Lonard ZAFFALON

OBSERVING CHANGE IN POTASSIUM ABUNDANCE IN A SOIL EROSION EXPERIMENT WITH FIELD INFRARED SPECTROSCOPY

Mila Ivanova Luleva, Harald van der Werff, Freek van der Meer, Victor Jetten

ЦАРСКАТА ПЕЩЕРА

Рафаил ПОПОВ

УЧИЛИЩНИ ЛАБОРАТОРИИ И ОБОРУДВАНЕ SCHOOL LABORATORIES AND EQUIPMENT

Учебни лаборатории Илюстрации от каталог на Franz Hugershoff, Лайциг, притежаван от бъдещия

2012 година
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ADDRESING STUDENTS’ MISCONCEPTIONS CONCERNING CHEMICAL REACTIONS AND SYMBOLIC REPRESENTATIONS

Marina I. Stojanovska, Vladimir M. Petruševski, Bojan T. Šoptrajanov

АНАЛИЗ НА ПОСТИЖЕНИЯТА НА УЧЕНИЦИТЕ ОТ ПЕТИ КЛАС ВЪРХУ РАЗДЕЛ „ВЕЩЕСТВА И ТЕХНИТЕ СВОЙСТВА“ ПО ЧОВЕКЪТ И ПРИРОДАТА

Иваничка Буровска, Стефан Цаковски Регионален инспекторат по образованието – Ловеч

ЕКОТОКСИКОЛОГИЯ

Васил Симеонов

ПРОФ. МЕДОДИЙ ПОПОВ ЗА НАУКАТА И НАУЧНАТА ДЕЙНОСТ (1920 Г.)

Проф. Методий Попов (1881-1954) Госпожици и Господа студенти,

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КОНЦЕПТУАЛНА СХЕМА НА УЧИЛИЩНИЯ КУРС П О ХИМИЯ – МАКР О СКОПСКИ ПОДХОД

Б. В. Тошев Българско дружество за химическо образование и история и философия на химията

ROLE OF ULTRASONIC WAVES TO STUDY MOLECULAR INTERACTIONS IN AQUEOUS SOLUTION OF DICLOFENAC SODIUM

Sunanda S. Aswale, Shashikant R. Aswale, Aparna B. Dhote Lokmanya Tilak Mahavidyalaya, INDIA Nilkanthrao Shinde College, INDIA

SIMULTANEOUS ESTIMATION OF IBUPROFEN AND RANITIDINE HYDROCHLORIDE USING UV SPECTROPHOT O METRIC METHOD

Jadupati Malakar, Amit Kumar Nayak Bengal College of Pharmaceutical Sciences and Research, INDIA

GAPS AND OPPORTUNITIES IN THE USE OF REMOTE SENSING FOR SOIL EROSION ASSESSMENT

Mila Ivanova Luleva, Harald van der Werff, Freek van der Meer, Victor Jetten

РАДИОХИМИЯ И АРХЕОМЕТРИЯ: ПРО Ф. ДХН ИВЕЛИН КУЛЕВ RADIOCHEMISTRY AND ARCHEOMETRY: PROF. IVELIN KULEFF, DSc

Б. В. Тошев Българско дружество за химическо образование и история и философия на химията

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TEACHING THE CONSTITUTION OF MATTER

Małgorzata Nodzyńska, Jan Rajmund Paśko

СЪСИРВАЩА СИСТЕМА НА КРЪВТА

Маша Радославова, Ася Драгоева

CATALITIC VOLCANO

CATALITIC VOLCANO

43-ТА МЕЖДУНАРОДНА ОЛИМПИАДА ПО ХИМИЯ

Донка ТАШЕВА, Пенка ЦАНОВА

ЮБИЛЕЙ: ПРОФ. ДХН БОРИС ГЪЛЪБОВ JUBILEE: PROF. DR. BORIS GALABOV

Б. В. Тошев Българско дружество за химическо образование и история и философия на химията

ПЪРВИЯТ ПРАВИЛНИК ЗА УЧЕБНИЦИТЕ (1897 Г.)

Чл. 1. Съставянето и издаване на учебници се предоставя на частната инициа- тива. Забележка: На учителите – съставители на учебници се запрещава сами да разпродават своите учебници. Чл. 2. Министерството на народното просвещение може да определя премии по конкурс за съставяне на учебници за горните класове на гимназиите и специ- алните училища. Чл. 3. Никой учебник не може да бъде въведен в училищата, ако предварително не е прегледан и одобрен от Министерството на народното просвещение. Чл.

JOHN DEWEY: HOW WE THINK (1910)

John Dewey (1859 – 1952)

ИНФОРМАЦИЯ ЗА СПЕЦИАЛНОСТИТЕ В ОБЛАСТТА НА ПРИРОДНИТЕ НАУКИ В СОФИЙСКИЯ УНИВЕРСИТЕТ „СВ. КЛИМЕНТ ОХРИДСКИ“ БИОЛОГИЧЕСКИ ФАКУЛТЕТ

1. Биология Студентите от специалност Биология придобиват знания и практически умения в областта на биологическите науки, като акцентът е поставен на организмово равнище. Те се подготвят да изследват биологията на организмите на клетъчно- организмово, популационно и екосистемно ниво в научно-функционален и прило- жен аспект, с оглед на провеждане на научно-изследователска, научно-приложна, производствена и педагогическа дейност. Чрез широк набор избираеми и факул- тативни курсове студентите

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УЧИТЕЛИТЕ ПО ПРИРОДНИ НАУКИ – ЗА КОНСТРУКТИВИСТКАТА УЧЕБНА СРЕДА В БЪЛГАРСКОТО УЧИЛИЩЕ

Адриана Тафрова-Григорова, Милена Кирова, Елена Бояджиева

ПОВИШАВАНЕ ИНТЕРЕСА КЪМ ИСТОРИЯТА НА ХИМИЧНИТЕ ЗНАНИЯ И ПРАКТИКИ ПО БЪЛГАРСКИТЕ ЗЕМИ

Людмила Генкова, Свобода Бенева Българско дружество за химическо образование и история и философия на химията

НАЧАЛО НА ПРЕПОДАВАНЕТО НА УЧЕБЕН ПРЕДМЕТ ХИМИЯ В АПРИЛОВОТО УЧИЛИЩЕ В ГАБРОВО

Мария Николова Национална Априловска гимназия – Габрово

ПРИРОДОНАУЧНОТО ОБРАЗОВАНИЕ В БЪЛГАРИЯ – ФОТОАРХИВ

В един дълъг период от време гимназиалните учители по математика, физика, химия и естествена

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„МАГИЯТА НА ХИМИЯТА“ – ВЕЧЕР НА ХИМИЯТА В ЕЗИКОВА ГИМНАЗИЯ „АКАД. Л. СТОЯНОВ“ БЛАГОЕВГРАД

Стефка Михайлова Езикова гимназия „Акад. Людмил Стоянов“ – Благоевград

МЕЖДУНАРОДНАТА ГОДИНА НА ХИМИЯТА 2011 В ПОЩЕНСКИ МАРКИ

Б. В. Тошев Българско дружество за химическо образование и история и философия на химията

ЗА ПРИРОДНИТЕ НАУКИ И ЗА ПРАКТИКУМА ПО ФИЗИКА (Иванов, 1926)

Бурният развой на естествознанието във всичките му клонове през XIX –ия век предизвика дълбоки промени в мирогледа на културния свят, в техниката и в индустрията, в социалните отношения и в държавните интереси. Можем ли днес да си представим един философ, един държавен мъж, един обществен деец, един индустриалец, просто един културен човек, който би могъл да игнорира придобив- ките на природните науки през последния век. Какви ужасни катастрофи, какви социални сътресения би сполетяло съвре

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MURPHY’S LAW IN CHEMISTRY

Milan D. Stojković

42-рa МЕЖДУНАРОДНА ОЛИМПИАДА ПО ХИМИЯ

Донка Ташева, Пенка Цанова

СЕМЕЙНИ УЧЕНИЧЕСКИ ВЕЧЕРИНКИ

Семейството трябва да познава училишето и училишето трябва да познава семейството. Взаимното познанство се налага от обстоятелството, че те, макар и да са два различни по природата си фактори на възпитанието, преследват една и съща проста цел – младото поколение да бъде по-умно, по-нравствено, физически по-здраво и по-щастливо от старото – децата да бъдат по-щастливи от родителите

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