bluuebunny/crossref_metadata_2025 huggingface dataset:
An analysis of laboratory parameters of chronic kidney failure in elderly patients
Authors: Hasković Edhem , Uzunalıć Harun , Unčanin Snežana , Herenda Safija , Hasković Denis , Selimović Amina
Published: January 2023

Aim: The chief aim of this study was monitoring of laboratory parameters of chronic kidney failure in elderly patients. Methods: All samples were taken and processed by standard methods and according to the principles of good laboratory practice. Data were collected in an organized and systematic manner in the form of a questionnaire with respect to ethical principles and as such were analyzed by statistical tests and analyses (Student's t-test, Analysis of variance-ANOVA, Pearson's and Spearman's correlation coefficients). The limit of statistical significance was set at p < 0.05. Results: Mean values of creatinine clearance and proteinuria for the total study population were: 41.30 ± 21.43 mL/min, 1.5 ± 2.3 g/L/24 h, respectively. Hematological parameters did not significantly differ from normal values. The highest frequency of comorbidities was observed in subjects aged ≥ 80 years with an average of 2.03 comorbidities per subject. Serum creatinine and urea values as well as creatinine clearance are good indicators of disease progression. Conclusion: The results of the presented research suggest that old age is a predisposing risk factor for the development of chronic kidney disease, and that in combination with comorbidities (hypertension and/or diabetes), it contributes to poor prognosis or disease progression.
Heterozygous c.1730G > C (p.Trp577Ser) variation in a case with familial hypercholesterolemia
Authors: Doğan Mustafa , Koksal Mehmet , Eroz Recep
Published: January 2023

Introduction: FH is an autosomal dominant disease of lipid metabolism. Hypercholesterolemia, xanthomas, and death from early coronary artery disease (CAD) are common in this disease due to a mutation in the LDLR, Apo-B100 or PCSK9 genes. Case report: A 4-year-old male patient with a very rare heterozygous c.1730G > C (p.Trp577Ser) variation in exon 12 of the low-density lipoprotein receptor (LDLR) gene that causes familial hypercholesterolemia (FH) was reported. As in this case, the heterozygous form may not show any symptoms in the first decade. This variation is region specific. Therefore, region-specific diagnostic criteria should be developed. Conclusion: We aimed to contribute to the literature on the development of diagnostic criteria by discussing the patient's condition with the clinical results.
In vitro assessment of the lipid peroxidation of N,N'-disubstituted benzimidazole-2-thiones: Hydrazides vs esters
Authors: Lazarević Jelena , Zvezdanović Jelena , Anastassova Neda , Mavrova Anelia , Yancheva Denitsa , Šmelcerović Andrija
Published: January 2023

Introduction: Oxidative stress and resulting lipid peroxidation are involved in numerous pathological conditions. For this reason, the role of antioxidants attracts attention and the radical-scavenging capacity of many natural and synthetic supplements and drugs has been extensively evaluated. Material and methods: In the present study, seven N,N'-disubstituted benzimidazole-2-thiones with ester (1 - 4) and hydrazide (5 - 7) side chains were investigated for in vitro antioxidant activity using lipid peroxidation method. Results: Among the assayed compounds, three hydrazides, 1,3-bis[3-(hydrazinooxy)-3-oxopropyl]-1,3dihydro-2H-benzimidazole-2-thione (5), 1,3-bis[3-(hydrazinooxy)-3-oxopropyl]-5-methyl-1,3-dihydro-2H benzimidazole-2-thione (6) and 1,3-bis[3-(hydrazinooxy)-3-oxopropyl]-5-benzoyl-1,3-dihydro-2H benzimidazole-2-thione (7) showed good antioxidant properties (IC50 ˂ 100 mM), with the best lipid peroxidation inhibition values (IC50) shown for compound 5 (64 ± 10 mM) and compound 6 (73 ± 29 mM). Conclusion: Indicated hydrazide structures may constitute a sort of molecular basis, a promising starting point for the development of compounds for the prevention and treatment of diseases resulting from oxidative damage.
Organizational structures of companies in modern business environment
Authors: Vujičić Slađana , Staletović Maja , Stevanović Mirjana , Gavrilović Milan
Published: January 2023

Modern trends operating from the environment require a different shaping of the organizational structure of the company. Accordingly, instead of traditional forms, more flexible organizational structures appear that are based on the characteristics of organic design. The emphasis is primarily on accepting change, decentralization of decision-making, a wider range of control, teamwork, adequate organizational culture, good interpersonal relationships, continuous learning and innovation development. Technological progress, scientific achievements, and thus the even greater need for continuous learning and acquiring new knowledge, as important characteristics of the modern business environment, have had the greatest impact on shaping the organizational structure of the company. The fact that information technology and knowledge are the basis of new organizational forms speaks in favor of that. Globalization has also played a role in creating the conditions for changing the organizational structure of companies, as well as the time of the COVID 19 pandemic. Organisations have been forced to do business differently and business processes have had to change rapidly in order for organisations to survive. The aim of this work is to indicate the fundamental trends that operate from the business environment and condition the need for the application of more flexible organizational forms. In addition, the aim of the paper is to point out the characteristics of organizational models that have emerged under the influence of these trends.
Costs of (re)designing the organizational structure in order to improve the competitiveness of transport companies
Authors: Radivojević Nikola , Pimić Miroslav , Mitrović Nenad
Published: January 2023

The paper examines the causality between the costs of (re)designing the organizational structure of transport companies operating in the Republic of Serbia and their competitiveness. The research was conducted on the sample of 22 transport companies, applying the Granger model of causality. The research covers the period from 2006 to 2020. The primary goal of the paper is to determine whether there is a causal relationship between the costs that companies sacrifice in (re)designing the organizational structure and their competitiveness, which is in the paper expressed by the market share. The findings indicate that there is bidirectional (or feedback) causality.
Military tourist institutions in the function of tourism development in Serbia
Authors: Knežević Milena , Ranisavljević Mihajlo
Published: January 2023

The COVID-19 pandemic has significantly changed the habits and needs of the world's population, global economy and all countries' economies. Tourism as a service sector of the economy suffered the most significant consequences at the beginning of the pandemic. According to data from the World Travel and Tourism Council (WTTC), the tourism sector's contribution to the global economy could reach 8.6 trillion dollars this year, which is only 6.4% less than before the pandemic. Therefore, today's tourist management must be creative, determined and dedicated much more than before. The subject of this research is the accommodation capacities of military tourist institutions and their utilisation in tourism development in the Republic of Serbia. The work aims to examine the utilisation of accommodation capacities of all military tourist institutions, especially during the pandemic, to increase the tourism potential of the Republic of Serbia and, ultimately, the overall development of our country. The research results indicate that a significant number of unused military tourist accommodation capacities could participate in developing Serbia's tourism, but with prior investment in increasing their quality. Another conclusion is that experiences from the pandemic period should be used for further development.
The impact of the COVID-19 pandemic on tourism insurance on the example of the Republic of Serbia
Authors: Kovačević-Berleković Bojana , Milić Dragana , Bošković Tatjana
Published: January 2023

The aim of the work is to investigate the impact of the pandemic caused by the covid-19 virus on certain forms of insurance in tourism in the market of the Republic of Serbia. The field research was conducted in the period from January to July 2022, and the subject of the research was to investigate the impact of the COVID-19 pandemic on the number and type of insurance plans, the amount of the premium, and the dynamics of insurance in tourism in the Republic of Serbia. The methods used in the work are the inductive-deductive method, the method of analysis and synthesis, the method of observation, the method of comparison, and the statistical method. The research has led us to the conclusion that certain forms of insurance in tourism did not resist the challenge of the pandemic, which confirmed the basic research hypothesis H1. The results of the research indicate that the most dynamic changes relate to tour operator guarantees and travel health insurance, and the importance of the research lies in the fact that it offers practical insights into the matter much needed for insurance researchers, insurers, policyholders, and others looking for solutions to risks associated with the pandemic.
Sustainable development and corporate social responsibility: Theoretical background and socio-economic context
Authors: Uzelac Ozren , Dukić-Mijatović Marijana , Stoiljković Aleksandra
Published: January 2023

The challenges of sustainable development and corporate social responsibility are critically discussed through the current concept of unsustainable development of the economy and society, numerous manifestations of such development, as well as the causes and consequences of this phenomenon. Indicators of unsustainable development were analyzed, in particular: problems of global poverty, problems of ecology, climate change, energy, disease and lack of education. Changes in the direction of a new trajectory of development are necessary, i.e. action directed towards a new development paradigm. This requires a greater role of science, especially economic science. The new concept of the economy implies new patterns of behavior in terms of ecological business and green economy. A new paradigm of development, a new strategy for the development of the economy and society is necessary because the current concept of growth and development has led to a series of negative effects on the natural environment, society and people. There are many forms of manifestation of unsustainable development: the problem of global poverty and hunger, problems of ecology, climate change and energy. The basic message is that humanity faces great challenges and that it is necessary to move from unsustainable development to sustainable development of the economy and society, where corporate social responsibility plays a key role. Sustainable development is a way of thinking, i.e. observation of the world, which we must change for the sake of the present and the future. In order to achieve this, synchronized actions are needed at the local (national) and global (world) level in order to find solutions, where large multinational economic systems must play a special role.
The particularities of the initial public offering process in the United States of America
Authors: Vladimirović Ivana
Published: January 2023

Initial public offering (IPO) presents a special mode of emission when a company for the first time publicly emits shares that are available to a wide scope of investors, institutions and individuals. IPO is a huge step that companies are willing to take only after a detailed analysis of their current situation, as well as advantages, disadvantages and potential risks that this action entails. The greater part of initial public offering is done through investment banks as specialized and highly professional financial institutions, which help the issuers when estimating opportunities for placing securities on the primary capital market and also offering various other services. The aim of this paper is to present the particularities of the IPO process in accordance with the legal regulations of the United States of America. Since determining the adequate price of the shares of IPO is the most sensitive part, that most often the success of the whole process depends on, a concise analysis of the key methods and factors influencing price formation is presented at the end of the paper.
Ekološka pismenost učenika u beogradskim školama - rezultati pilot istraživanja
Authors: Marušić-Jablanović Milica , Stanišić Jelena , Savić Slađana
Published: January 2023

The environmental issues that our country is faced with are numerous, while the consequences of environmental degradation affect the health and the quality of life of our citizens. In this context, the issue of environmental education and environmental literacy is gaining momentum. In the present pilot research we examined the possibility of applying an international instrument for determining the level of environmental literacy, the Middle School Environmental Literacy Survey (MSELS), on a population of students in the higher grades of elementary school in Serbia. This instrument measures the environmental literacy using four components: environmental knolwedge, environmental affect, cognitive skills, and environmental behavior, together with corresponding sub-components. The content of the instrument was analyzed in the context of Biology and Civic education curricula as well as educational standards for the end of compulsory education for the subject Biology. Survey method was used in the research, while the data were analyzed using descriptive statistics. The data were collected on a sample of the seventh-grade elementary school students (N=111) from the territory of Belgrade. In addition, five group interviews were conducted with the students to check the clarity of the content of the instrument. The researchers established that the implementation of this instrument is adequate on several grounds: 1) the instrument is well-grounded in theory; 2) the instrument is based on a comprehensive approach to environmental literacy measurement; 3) the instrument is adequate in terms of the teaching and learning program in our education system and 4) the instrument has solid metric features. An overall reliability of the instrument is ,87. The respondents had the highest score in the component of affective attitudes towards environment, relative to other measured components, as well as relative to two countries used for comparing the results (USA, Greece). The lowest score was identified on the scale of the basic environmental knowledge, and the conclusion is that students did not fully master the knowledge envisaged in the educational standards for Biology lessons. The main disadvantage of the instrument is the time required for filling it out due to the amount of the content.
Stavovi učitelja i studenata pedagoških/učiteljskih fakulteta o obeležjima uloga učitelja u heurističkoj nastavi u prvom ciklusu osnovnog obrazovanja i vaspitanja
Authors: Starijaš Gorana , Vilotijević Nada
Published: January 2023

Heuristic instruction is one of the less researched and used teaching models. Although it has a long history, as a special teaching model, it started to develop several decades ago. In this research, we are interested in the roles of teachers in heuristic instruction, though we cannot neglect their roles in traditional teaching as well because it is dominant in schools. The aim of the research is to examine the attitudes and opinions of primary school teachers and students of pedagogical/teacher education faculties about the roles of teachers in heuristic lessons. The research is based on descriptive scientific research method. In addition, the method of theoretical analysis was used. The research showed the opinions of 336 teachers from the territory of Belgrade and 433 students of the third and fourth-year of teacher education/pedagogical faculties in Serbia, and a list of teacher roles was determined, which, according to the respondents, are key in the efficient organization of heuristic teaching and are based on independent and creative research work of students. The obtained results indicate that the respondents take a very positive attitude towards the roles of teachers in heuristic teaching, which indicates the importance and a need for practical application of this form of teaching in our schools in the first cycle of primary school education.
Stavovi roditelja prema čitalačkoj kulturi učenika mlađih razreda osnovne škole
Authors: Milanović Nedeljko , Matejević Marina
Published: January 2023

The aim of this research is to determine the attitudes of parents towards the reading culture of students in the lower grades of primary school. 180 parents from the Republic of Serbia participated in the research. A descriptive method and a theoretical analysis method were applied, while the instrument was created separately for this research. The obtained results show the positive attitudes of parents towards the reading culture of the children in the lower grades of primary school, although most parents believe that there are certain obstacles in the development of reading culture, such as: a low socio-economic status of parents (18.3%), a lack of interest and laziness of both parents and children (17.8%), parents overworked (14.4%), reading is not in trend (8.9%), and digitalization process (7.8%). Also, significant statistical differences were observed between the socio-demographic characteristics of parents and their attitudes towards reading culture. The results show that mothers, more often than fathers, believe that children should read every day. Parents with a higher level of education generally care more about their children's reading culture. Older parents generally believe that children should be influenced by a personal example, while younger parents more often believe that parents should be involved in school activities. The implications of the obtained findings suggest that reading culture must become an imperative today, both in the family environment and in the joint cooperation of parents with the school through the involvement of parents in curricular and extracurricular activities and contents.
Prenosive veštine u nastavnom programu strukovnih studija za vaspitače
Authors: Đorđev Ivana , Sturza-Milić Nataša
Published: January 2023

U savremenom društvu nije dovoljno posedovati samo stručna znanja i veštine u određenoj (stručnoj) oblasti. Od zaposlenih i posebno onih koji se pripremaju za ulazak na tržište rada očekuju se sve više i osnažene dodatne - prenosive veštine, kao što su: interpersonalne, analitičke, tehničke, organizacione i intrapersonalne - lične veštine. Istraživanje čije rezultate prezentujemo u ovom radu imalo je cilj da se prepoznaju iskazi kojima se u silabusima nastavnih predmeta programa za vaspitače osnovnih strukovnih studija Visoke škole u Vršcu upućuje na osnaživanje ovih veština, kao i da se utvrdi njihova zastupljenost. Sa tim ciljem pregledano je ukupno 70 silabusa, koji su objedinjeni u Knjizi predmeta za program Strukovni vaspitač. Rezultati istraživanja pokazali su da silabusi posmatranog studijskog programa sadrže ukupno 763 iskaza kojima se upućuje na osnaživanje prenosivih veština budućih vaspitača, odnosno da je oko 20% svih iskaza posmatrane Knjige predmeta usmereno na osnaživanje prenosivih veština studenata. Nema nijednog silabusa kojim se ne ukazuje (određenim brojem iskaza) na osnaživanje neke od prenosivih veština studenata, a bezmalo dve trećine svih silabusa u Knjizi predmeta čine silabusi koji sadrže 10 i više iskaza usmerenih na jačanje prenosivih veština, polaznika predmeta. Dominiraju iskazi kojima se pretpostavlja osnaživanje interpersonalnih veština (u prvom redu komunikacijskih), intrapersonalnih (najpre osnaživanje kritičkog mišljenja i proučavanja literature), te digitalnih prenosivih veština. Dobijeni rezultati potvrdili su primarnu hipotezu da se u silabusima nastavnih predmeta inoviranog studijskog programa Strukovni vaspitač osnovnih strukovnih studija Visoke škole u Vršcu u znatnoj meri javljaju iskazi o osnaživanju prenosivih (pre svega, komunikacijskih, ličnih i digitalnih) veština koje mogu olakšati i ubrzati proces ulaska diplomiranih vaspitača na tržište rada i pripremiti ih za celoživotno učenje i efikasan profesionalni razvoj. Realizovano istraživanje može biti motivacija za dalja, komparativna i dr. istraživanja o integraciji prenosivih veština u visokoškolsku nastavu i nudi putokaze za praktične implikacije.
Communication and professional development as predictors of attitudes of teachers (Serbian, Croatian and Bosnian ethnicity) towards social contents in the teaching nature and society
Authors: Cvijanović Đorđe , Marić Mia , Janković Aleksandar
Published: January 2023

The research aimed to examine the contribution of two important factors, communication and professional development, to the formation of attitudes of teachers of different ethnicities towards the realization of social content in the teaching of nature and society. The sample included a total of 301 teachers of Serbian, Croatian and Bosnian ethnicity. The results obtained by the research show that the developed communication between teachers, through their actions, contributes to the development and improvement of positive attitudes towards social content in the teaching of nature and society, which results in increased efficiency of the educational process. The results show that there is a statistically significant contribution to the prediction of teachers' attitudes towards social content in teaching nature and society by the factors of professional development, too, in such a way that the more pronounced presence and quality of professional development significantly affects the development and formation of positive attitudes about society contents. In addition to the theoretical explanation of the role and importance of important concepts related to social content and teachers' attitudes towards them, in practical terms, the contribution of this research is reflected in the implications of significant relations between various factors in the field of educational outcomes in the region (Serbia, Croatia and Bosnia and Herzegovina). In line with that, the practical implications indicate that through educational policies, greater mutual communication between educators should be encouraged and better conditions should be provided for continuous formal and non-formal education of teachers, through lifelong learning in the countries of the region.
Čime se bavimo u vrtiću i zašto mislimo da je to važno?
Authors: Kovačević Zorica
Published: January 2023

Kada se započelo sa obukama vaspitača za primenu Osnova programa predškolskog vaspitanja i obrazovanja - Godine uzleta, učenje i istraživanje dece i vaspitača kroz teme/projekte našlo se u fokusu interesovanja stručne i naučne javnosti u oblasti predškolskog vaspitanja i obrazovanja. Vaspitači su se našli pred brojnim izazovima, a jedan od prvih jeste izbor i pokretanje tema/projekata. U radu su predstavljeni rezultati istraživanja koje je imalo cilj da ispita stavove vaspitača u vezi sa izborom i značajem određenih tema/projekata za rad sa decom - kakav odnos imaju prema slobodi koja im je poverena prilikom izbora tema/projekata i sadržaja vezanih za njih, u kojoj meri određeni faktori utiču na njihovu odluku da započnu istraživanje u okviru određene teme/projekta, kojim namerama/ciljevima se vode pri izboru i razvijanju tema/projekata. Korišćena je deskriptivna metoda sa anketiranjem kao istraživačkom tehnikom. Istraživanjem je obuhvaćeno 466 vaspitača sa teritorije Beograda. Rezultati istraživanja, koji se odnose na kriterijume izbora tema/projekata, pokazuju da vaspitači u značajnoj meri razumeju suštinske odrednice i potencijale nove programske koncepcije, a da oni koji su prošli obuku u značajno većoj meri pokreću teme/projekte zasnovane na zainteresovanosti dece za fenomene koji su bliski njihovom iskustvu, koji omogućavaju neposredno istraživanje dece i istinsko učešće dece u istraživanju. Međutim, rezultati koji se odnose na značaj realizovanih tema/projekata iz perspektive vaspitača pokazuju da u razumevanju procesa učenja deteta predškolskog uzrasta još uvek nije došlo do značajnih transformacija i da je vaspitačima u ovom segmentu potrebna snažnija podrška kako bi izašli iz dosadašnjih okvira i načina razvijanja realnog programa karakterističnih za prethodne koncepcije.
Exploring university students' self-regulation in online foreign language education
Authors: Kurt Gökçe , Tomak Burak
Published: January 2023

With the spread of the Covid-19 pandemic, online education has been embraced as an instructional delivery mode to ensure continuity in all levels of education including higher education. Given the fact that the success of online learning heavily relies on the learner's ability to autonomously regulate their learning, this study focuses on self-regulatory behaviors of tertiary level EFL learners enrolled in an online intensive language preparatory program. Quantitative and qualitative data were gathered to explore learners' perceived levels of online self-regulation; the predictive role of online learning self-efficacy beliefs in their self-regulation; and the strategies they used to regulate their learning in online education. Findings revealed learners' moderate level of online self-regulation predicted by their self-efficacy beliefs. Moreover, EFL learners used a variety of strategies to regulate their learning before, during and after synchronous online classes.
Anxiety and self-efficacy in ESP learning: Effects on academic success
Authors: Šafranj Jelisaveta , Gak Dragana , Bulatović Vesna
Published: January 2023

The aim of this research is to determine the influence of students' English for Specific Purposes (ESP) classroom anxiety and self-efficacy on their achievement. The research is exploratory, based on a quantitative approach and systematic non-experimental observation. The research results show that ESP self-efficacy is negatively correlated with classroom anxiety. ESP achievements are positively related to self-efficacy, and accordingly they show that some students are aware that they can, while others are aware that they cannot. Thus, the statistical significance of the relationship between ESP self-efficacy and achievement gives the advantage of self-efficacy as a predictor of success. Gender is only related to achievement, with female respondents achieving slightly higher grades. There were no significant differences between those who resided and those who did not reside in English-speaking countries. It is concluded that students should be educated to be realistic and objective in self-assessment. The meta-cognitive ability for realistic self-assessment should be developed in students because in the process of increasing self-regulation of learning, the value of personality is reflected in the self-efficacy pattern.
Natural deep eutectic solvent as tool for improving Rosa canina L. polyphenol recovery in maceration
Authors: Jovanović Aleksandra , Pjanović Rada , Živković Jelena , Ćujić Danica , Gnjatović Marija , Stepanović Sandra , Šavikin Katarina
Published: January 2023

Rosa canina L. extracts were prepared using water or three natural deep eutectic solvents (NADESs: betaine+malic acid, betaine+sucrose, and citric acid+sucrose with 50% of water) and maceration. The extracts were characterized in terms of total polyphenol content (TPC), ABTS radical scavenging potential, extraction yield, zeta potential, conductivity, pH, density, surface tension, and viscosity. TPC was the highest in betaine+malic acid extract (10.4 mg gallic acid equivalents, GAE/g), and the lowest in water and citric acid+sucrose extracts (6.5 and 6.4 mg GAE/g, respectively). ABTS radical scavenging potential was the highest in water extract, 5.6 mmol Trolox/g, whereas the lowest was in citric acid+sucrose extract, 2.6 mmol Trolox/g. Extraction yield was the lowest for betaine+malic acid extract, 0.607 %, and statistically significantly higher for betaine+sucrose extract, 1.22 %. Zeta potential (absolute value) was the highest for betaine+sucrose extract (-2.12 mV), and the lowest for citric acid+sucrose extract (0.29 mV). Conductivity was in the range of 0.25 mS/cm (betaine+sucrose extract) to 5.46 mS/cm (betaine+malic acid extract). pH ranged from 3.0 in betaine+malic acid extract to 4.5 in water and betaine+sucrose extracts. Density varied from 1.00 g/mL for water extract to 1.19 g/mL for betaine+sucrose extract, while surface tension varied from 35.0 mN/m for betaine+sucrose extract to 40.6 mN/m for water extract. Viscosity of water extract was 1.52 mPa·s and it was significantly higher for citric acid+sucrose extract, 10.67 mPa·s. The application of NADESs as an extraction medium can improve polyphenol recovery from rose hips, as well as extraction yield and conductivity, but depending on NADES composition. Namely, the highest TPC and conductivity were measured in betaine+malic acid extract, while betaine+sucrose extract possesses the highest extraction yield. Thus, the constitution of NADES should be optimized depending on the future application of the extract.
Morphological and anatomical analysis of the clary sage herbal drug (Salviae sclareae herba)
Authors: Ranđelović Milica , Zlatković Bojan , Jovanović Maja , Miladinović Bojana , Milutinović Milica , Pavlović Dragana , Branković Suzana , Kitić Dušanka
Published: January 2023

This paper presents an analysis of the morphological and anatomical characteristics of the aboveground parts (herba) of clary sage (Salvia sclarea L.), with an emphasis on the investigation of its surface structures. After the procedure of the primary processing and drying of the plant material, it was determined that the composition of the crushed herbal drug Salviae sclareae herba showed the presence of parts of leaves, bracts, flowers and axis of the inflorescence, stems, and a small amount of ripe nuts. The analysis of the surface structures of the drug parts on a stereomicroscope and then on permanent microscopic slides indicated the presence of two functional types of trichomes (glandular and non-glandular). Non-glandular mechanical trichomes are found in the unicellular and multicellular forms while glandular trichomes are differentiated as capitate, with a greater number of subtypes, and peltate. Peltate trichomes are most common on the calyx and corolla while capitate are most abundant on the surface of the stem and leaf. Further studies should be directed toward the chemical characterization of the essential oil of the herb and individual organs present in the glandular trichomes, along with the investigation of its pharmacological effects.
Melissa officinalis extracts obtained using maceration, ultrasoundand microwave-assisted extractions: Chemical composition, antioxidant capacity, and physical characteristics
Authors: Jovanović Aleksandra , Mosurović Milica , Bugarski Branko , Batinić Petar , Čutović Natalija , Gordanić Stefan , Marković Tatjana
Published: January 2023

Even though Melissa officinalis L. (lemon balm, fam. Lamiaceae) is a well-known medicinal, aromatic, and spicy plant, and its physicochemical profile and biological activity have been investigated, there is no detailed research regarding the influence of solvent nature (polarity) on the extraction of active compounds (total polyphenols and total flavonoids) and antioxidant activities of the obtained extracts. Therefore, this study aimed to evaluate the polyphenol and flavonoid contents, as well as the antioxidant potential of lemon balm extracts obtained by varying the polarity of the extraction solvents (methyl alcohol, acetone, ethyl acetate, and deionized water) and using three extraction techniques (maceration-MAC, ultrasound-UAE, and microwave-assisted extraction-MAE). Two in vitro tests (ABTS and FRAP assays) were used to determine the antioxidant activity of the extracts. Total tannin and total protein contents, extraction yield, and physical properties of the selected extracts were measured as well. The highest content of polyphenols was found for the methanolic and water extracts obtained by all three extraction techniques, while the highest flavonoid yield was detected only in the mentioned methanolic extracts. The microwave reactor provided methanolic, ethyl acetate, and water extracts with the highest ABTS radical scavenging activity, while in the case of UAE, it was methanolic and water extracts, and in the case of MAC only water extracts. On the other hand, among lemon balm extracts from MAC, water extract possessed the highest ferric reducing power, whereas in UAE and MAE, it was ethyl acetate extract. Total tannin content determined in selected water extracts was 2.55, 4.53, and 1.83 mg tannic acid equivalent (TAE)/mL, while total proteins amounted to 1.34, 1.50, and 1.31 mg/mL using MAC, UAE, and MAE, respectively. The content of total extractive substances in the form of the extraction yield was also determined for selected water extracts and amounted to 12.6 % for MAC, 17.2 % for UAE, and 36.8 % for MAE. Further, this research has included the investigation of some physical properties of lemon balm water extracts, such as conductivity (3.68-4.14 mS/cm), pH (5.99-6.43), density (0.854-0.901 g/mL), surface tension (26.0-31.7 mN/m), and viscosity (1.18-1.21 mPa·s). This research represents the base for the future encapsulation of lemon balm extracts, enriched in polyphenol content, in a novel type of biofunctional carrier that potentially can be applied in the pharmacy, chemical industry, and biotechnics.
Seventy years of educational knowledge production in the journal Studies in Teaching and Education
Authors: Ilić-Rajković Aleksandra , Nikolić Nataša
Published: January 2023

On the occasion of the 70th anniversary of the journal Studies in Teaching and Education, this paper offers an analysis of its contribution to creating and disseminating educational knowledge in Serbia. It looks at the characteristics of educational knowledge production in the journal, seeking to answer the following research questions: who creates knowledge, when, how and why certain knowledge emerges, and how it is transformed over time. The analyzed sample consists of the contents of eight volumes of the journal published in ten-year intervals since its launching up to the present day. The main conclusion is that the journal Studies in Teaching and Education is an important source of production and circulation of various forms of educational knowledge (theoretical knowledge, knowledge derived from academic research, and knowledge meant to be applied in practice) in numerous areas of education. It is primarily members of the academic community but also practitioners who participate in the production of this knowledge. As a result, the journal Studies in Teaching and Education has occupied a significant place among education scholars and practitioners ever since it was established 70 years ago.
The maker movement as learning communities during the Covid-19 pandemic in the context of higher education
Authors: Koruga Nikola
Published: January 2023

Global movements for the exchange of knowledge and skills such as makerspaces have led to the establishment of networks of local initiatives for learning communities. This paper aims to examine attitudes to the maker movement in the context of higher education during the Covid-19 crisis, as its informal structure, as well as the values that underpin it, can provide a faster and specific response to unpredictable situations. The paper reviews scholarly papers and news items about makerspaces at universities dealing with the higher education response to the Covid-19 pandemic. The results suggest that the study of learning communities' response to the crisis is significant from the perspective of learning how to overcome future crises. Experimenting with approaches using local resources as well as global knowledge and experience, which must be open and accessible, contributes to global initiatives and movements for the exchange, but also the creation of knowledge in communities, promoting community development through educational innovations.
The minors as victims in a criminal proceedings for criminal offenses against sexual freedom
Authors: Dragojlović Joko
Published: January 2023

It is undeniable that the minors represent a particularly sensitive group of the modern society. Criminal acts have a particularly hard impact on the minors, especially children. For this reason, the domestic legislator almost always incriminates an act committed against a minor and/or a child as the most serious or heaviest form of a criminal act. However, in addition to prescribing special, more serious forms of criminal offenses when they are directed against a minor, and in addition to punishing such offenses much more severely, the domestic legislator also intervenes from another angle, guided by the best interest of a child as an absolute imperative, so he prescribes special rules under which the minors can participate in a criminal proceedings for criminal acts directed against them. This paper, starting from the general rules on the position of the injured party, provides an overview of the special rules referring to the minors as the injured parties.
A police service dog as a means of coercion
Authors: Bingulac Nenad , Sekulić Nenad
Published: January 2023

The use of animals in the execution of complex tasks by police officers and military units does not represent any novelty in the operational and legal sense. But, this topic has not been considered enough in professional and scientific circles, for which there should be found some space, especially if we take into account certain "news" in the legislative sense occurred at the international level. The basic hypothesis of this paper refers to the consideration of the issue of the use of a police service dog. Within the previously mentioned discussion, the focus of the work is grouped into two parts, namely the first part relates to the legislative provision of the use of police service dogs in terms of training and use, while the second one refers to their tactical application when performing complex tasks. In particular, it is considered the issue of legislative news and initiatives appeared in the American legislative system. Bearing in mind the increasingly dominant attitude of the world population on the topic of animal protection, there is to be expected that a similar topic will soon be raised in our country too. In this research, in addition to analysis, deduction and comparative scientific methods, the specialization method was also used. At the end of this research, in the concluding remarks, there was presented a review of the most significant parts of the work as well as specific conclusions arising from this overall research. Of course, the authors' personal views were also included.
Physical exercise during and after coronavirus a look at some indoor exercise options
Authors: Đukić Verica
Published: January 2023

The proclamation of the corona virus pandemic (KOID -19) by the Sets Health Organization on March 11, 2020 and, in connection with that, anti-epidemic measures limited the maintenance of daily life needs related to movement, as well as work sports activities, both individually and in collective sports. In order to maintain public health in a situation of reduced regular physical activity, health institutions, as well as prominent health workers, directed the public to the possibilities of physical activities, before at home, and then in open spaces suitable for walks with light exercises that activate the whole body. Contributions to this effort were also given by educational institutions, primary and secondary schools, with daily presentations of possible exercise content, applied in the newly created conditions in the teaching of physical education. The importance of physical activity is also in the prevention of good mental health and in sick people, the prevention of complications of further development of the underlying disease when it comes to the coronary virus pandemic. Particular attention is paid to physical exercise during recovery and return to sports activities, since nutritionthe coronairus can leave great consequences on vital organs in the treatment of this disease. The diet for recovery after covid is also the subject of attention of the health profession, because it is impossible to recover the previous energy and functional state of vital organs without consuming an appropriate diet. Taxonomically, the types of quality foods are not listed for the course of treatment and the state after which and how which of them is necessary.
Differences in the drop-off parameter betweenelite swimmers in the 100m butterfly
Authors: Đurović Marko , Danev Miomir , Paunović Miloš , Gračanin Irfan , Madić Dejan , Okičić Tomislav
Published: January 2023

This research aimed to determine differences in pace strategies between the two groups of elite swimmers at the 2019 World Championships in the 100m butterfly. The overall sample included in this study consisted of 16 male participants of the World Swimming Championships in South Korea, who were divided into two groups. The first group consisted of finalists (22.88 ± 3.83 years; n = 8), and the second group of semifinalists (24.63 ± 4.93 years; n = 8). The results are taken from the official results from the omega timing website. A T-test was used to determine the differences between groups. Finalist were faster than semifinalists for first lap (23.82 ± .45 vs. 24.26 ± .30 s, p= .035), second lap (27.34 ± .31 vs. 27.78 ± .34 s, p= .018) as well as final time (51.16 ± .74 vs. 52.04 ± .26 s, p= .007) but not in drop off (3.53 ± .22 vs. 3.51 ± .59 s, p= .946). Finalists of the 100-m butterfly event at international competitions swam a faster first and second lap compared to their competitors in the semifinal group. Both groups are elite swimmers and showed abilities to maintain swimming velocity in first and second laps, therefore minimizing the drop-off from the start to the end of the race. The pacing strategies of elite swimmers remain relatively stable. The obtained results can be a good starting point in the learning process and education of teachers who coach young swimmers.
The influence of morphological characteristics on wrestlers' preparedness
Authors: Marković Milan , Toskić Lazar , Kukić Filip , Zarić Ivan , Dopsaj Milivoj
Published: January 2023

In wrestling, weight categories are defined by rules, so the morphological composition of the body is an important factor in success. The subject of the paper is the morphological parameters of the examinees and the preparedness parameters on the Specific Wrestling Performance Test (SWPT). The aim of the research is to determine the influence of morphological characteristics on physical fitness, and the way of recovery of functional characteristics, as well as their interrelations and regularities. The sample consists of 26 wrestlers aged 20.2 ± 1.7 years, training experience 6.7 ± 3.2 years, number of weekly training 7.8 ± 1.9, body height 178.9 ± 5.6 cm, body weight 82.9 ± 7.4 kg, body mass index 25.9 ± 2.0 kg/m2. From the aspect of morphological characteristics, the percentage of body fat - PBF, the percentage of muscle mass - SMM (InBody 720) were observed; as a parameter of preparedness, the total number of throws on the test was taken - TnThrows; while functional characteristics were defined as the percentage recovery of pulse frequency from the end of the test to the 1st and 3rd minute - DHR1min and DHR3min. Correlation statistics and linear regression analysis were used to determine the relations. Defined analyzes did not show a significant correlation between SMM and any other monitored variable, while PBF showed a highly statistically significant correlation with TnThrows (r = -0.608, p = 0.001), and a significant correlation with DHR3min (r = -0.429; p = 0.029 ). Significant correlations were also determined between TnThrows and functional recovery characteristics (DHR1min, r = 0.522, p = 0.006; DHR3min, r = 0.454, p = 0.020). In the homogeneous groups, such as actively trained wrestlers, the percentage of muscle component is uniform, while training is significantly different, which partially affects the different representation of fat component, and all this definitely affects the success and recovery of wrestlers.
Ispravka: Nauka i fizička kultura - pogled u budućnost (2019, vol. 6, br. 1, str. 5-14)
Authors: Uredništvo U
Published: January 2023

U radu NAUKA I FIZIČKA KULTURA - POGLED U BUDUĆNOST, 2019, vol. 6 br. 1 na strani 5 tehničkom greškom pogrešno je navedeno prezime jednog od autora rada dr Kristine Pantelić Babić. Ovom prilikom izvinjavamo se autoru kao i čitaocima. Ispravno navedena afilacija autora: Nenad Živanović1, Petar Pavlović2, Veroljub Stanković3, Zoran Milošević4, Nebojša Ranđelović5 i Kristina Pantelić Babić6
Perovskite solar cells: Recent development and perspectives
Authors: Aleksić Katarina , Marković Smilja
Published: January 2023

The energy conversion efficiency of hybrid organic-inorganic perovskite solar cells (PSCs) has reached a value comparable to commercially available silicon solar cells. The main challenges for their commercialization are instability and toxicity.
Development of modern freight forwarding in Serbia: An economic activity older than the principality of Serbia
Authors: Stojanović Đurđica , Marić Vukašin
Published: January 2023

For the first time, development of freight forwarding, as an economic activity in Serbia, is analysed in this paper. At the beginning, a brief literature review on the origin and evolution of freight forwarding is given, as well as the research motivation and goal. Currently, there is any study that systematically deals with the historical development of the freight forwarding in Serbia. The development of freight forwarding in the period before the Second World War is almost entirely unknown. The main goal of presented research is to highlight a long tradition of the freight forwarding in Serbia and significance of its exploring. An analysis of archival material available in the archives and libraries of the Republic of Serbia revealed that the first freight forwarding firms, engaged in some of the basic modern freight forwarding operations (custom brokerage, transport organization, storage of customs goods, etc.), were mentioned at the end of the XVIII century. Socio-political, economic, and other historical circumstances directly affected the characteristics of freight forwarding businesses and companies. The paper briefly describes the development of freight forwarding over the time through a description of the basic characteristics of freight forwarding companies (size, types of business, geographical distribution, and others) within the distinct periods from the XVIII to the XXI century.
Trip rates of different types of obects in the urban environment
Authors: Ilić Nikola , Đorić Vladimir
Published: January 2023

The paper presents the methodology and results of research on the basic characteristics of movement and generated traffic of different land purposes in the city of Loznica. By determining the basic travel characteristics for each selected zone and forming an adequate set of independent parameters for the calculation of rates. The goal is to establish links between land use and generated traffic. Based on foreign literature, scientific papers, manuals and models, a methodology was created that is adapted to local conditions for each research zone. Data on each zone were processed and analyzed in order to determine the basic travel characteristics. The basic travel characteristics for related zones are presented in groups in order to better compare similarities and differences. Based on the obtained results on generated traffic and the selected set of independent variables for each zone, the trip rates of generated traffic were calculated and compared with the results of the American manual of generated traffic. Also, conclusions were drawn on the usability of the generated traffic rates from the American manual and the relationship between the basic travel characteristics and their impact on the calculated generated trip rates.