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Article ; Online: MODIFICATION OF THE COBWEB MODEL INTO GENERALIZED LOGISTIC EQUATION FOR THE WHEAT PRICE ANALYSIS

Jelena Stanojević / Nemanja Vuksanović / Katarina Kukić / Vesna Jablanović

Ekonomika Poljoprivrede (1979), Vol 70, Iss

2023 Volume 4

Abstract: In the paper we constructed the new wheat growth model, based on the generalized logistic equation. Starting from the theoretical framework of the cobweb model, we adapted generalized logistic equation to better fit the real data of wheat prices, ... ...

Abstract	In the paper we constructed the new wheat growth model, based on the generalized logistic equation. Starting from the theoretical framework of the cobweb model, we adapted generalized logistic equation to better fit the real data of wheat prices, according to the presented wheat growth model. The aim of the paper is to present how logistic and generalized logistic equations can be used for both prediction of wheat prices and for the wheat price stability analysis. Data analysis showed better performances of the generalized logistic map in comparation with the conventional logistic map as a main result of this paper. For estimated parameters of the model the bifurcation diagrams also have been presented to show stability of wheat price over time. The conclusion is that the proposed model can be useful in predicting future wheat prices in the short-run period, as well as for the analysis of stability in conditions of uncertainty, which is also a recommendation for the application of the model in the future research.
Keywords	cobweb theorem ; wheat price ; growth model ; generalized logistic equation ; Agriculture ; S
Subject code	330
Language	English
Publishing date	2023-12-01T00:00:00Z
Publisher	Naučno društvo agrarnih ekonomista Balkana, Beograd; Institut za ekonomiku poljoprivrede, Beograd i Akademija ekonomskih nauka, Bukurešt
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Assessing international competitiveness and its role towards the economic prosperity within EU integration framework

Jelena Stanojević / Gabrijela Veličković

Management : Journal of Contemporary Management Issues, Vol 26, Iss Special Issue, Pp 45-

2021 Volume 62

Abstract: Enhancing competitiveness in the era of globalization has become an essential topic of academic and policy debates for all contemporary economies. The role of a country’s competitiveness has been addressed by many scholars aiming to assess the extent to ... ...

Abstract	Enhancing competitiveness in the era of globalization has become an essential topic of academic and policy debates for all contemporary economies. The role of a country’s competitiveness has been addressed by many scholars aiming to assess the extent to which this concept is associated with economic prosperity matters, such as social welfare and attracting foreign direct investments. Along with this debate, there has been a growing interest in understanding the linkages between the competitive forces and the gap in economic progress across the EU members, this being one of the main concerns within the EU. Filling this gap and achieving greater convergence among the EU countries has been one of the critical goals in shaping the European structural policy reforms. However, following the empirical findings, there has been little consensus on what are the main sources of a country’s economic progress as addressed through the prism of national competitiveness, particularly if being studied in the context of EU integration. In this context, the study aims to assess the economic performance of the countries that joined the EU first and those that joined last, concerning its linkages with a country’s international competitiveness. The focus is placed on innovation and business sophistication factors’ relative significance and contribution to the economic growth for the observed period (2008-2017). The analysis is based on the World Economic Forum methodology for measuring the Global Competitiveness Index and World Bank database. The research is conducted through comparative analysis, as well as regression analysis aiming to evaluate the relationship between competitiveness and economic development indicators. The findings of the study emphasize a better understanding of the importance of the EU accession date for the country’s overall competitiveness and economic performance, as well as the contribution of R&D innovation and business sophistication, as more advanced competitiveness factors, to economic prosperity ...
Keywords	economic performance ; international competitiveness ; competitiveness factors ; research & development ; innovation ; EU countries ; Economic growth ; development ; planning ; HD72-88 ; Economics as a science ; HB71-74
Subject code	330
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	University of Split, Faculty of Economics
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Intermittent Theta Burst Stimulation Improves Motor and Behavioral Dysfunction through Modulation of NMDA Receptor Subunit Composition in Experimental Model of Parkinson’s Disease

Milica Zeljkovic Jovanovic / Jelena Stanojevic / Ivana Stevanovic / Andjela Stekic / Samuel J. Bolland / Nebojsa Jasnic / Milica Ninkovic / Marina Zaric Kontic / Tihomir V. Ilic / Jennifer Rodger / Nadezda Nedeljkovic / Milorad Dragic

Cells, Vol 12, Iss 1525, p

2023 Volume 1525

Abstract: Parkinson’s disease (PD) is the second most common neurodegenerative disorder characterized by the progressive degeneration of the dopaminergic system, leading to a variety of motor and nonmotor symptoms. The currently available symptomatic therapy loses ...

Abstract	Parkinson’s disease (PD) is the second most common neurodegenerative disorder characterized by the progressive degeneration of the dopaminergic system, leading to a variety of motor and nonmotor symptoms. The currently available symptomatic therapy loses efficacy over time, indicating the need for new therapeutic approaches. Repetitive transcranial magnetic stimulation (rTMS) has emerged as one of the potential candidates for PD therapy. Intermittent theta burst stimulation (iTBS), an excitatory protocol of rTMS, has been shown to be beneficial in several animal models of neurodegeneration, including PD. The aim of this study was to investigate the effects of prolonged iTBS on motor performance and behavior and the possible association with changes in the NMDAR subunit composition in the 6-hydroxydopamine (6-OHDA)-induced experimental model of PD. Two-month-old male Wistar rats were divided into four groups: controls, 6-OHDA rats, 6-OHDA + iTBS protocol (two times/day/three weeks) and the sham group. The therapeutic effect of iTBS was evaluated by examining motor coordination, balance, spontaneous forelimb use, exploratory behavior, anxiety-like, depressive/anhedonic-like behavior and short-term memory, histopathological changes and changes at the molecular level. We demonstrated the positive effects of iTBS at both motor and behavioral levels. In addition, the beneficial effects were reflected in reduced degeneration of dopaminergic neurons and a subsequent increase in the level of DA in the caudoputamen. Finally, iTBS altered protein expression and NMDAR subunit composition, suggesting a sustained effect. Applied early in the disease course, the iTBS protocol may be a promising candidate for early-stage PD therapy, affecting motor and nonmotor deficits.
Keywords	Parkinson’s disease ; 6-OHDA ; rTMS ; iTBS ; NMDA receptor ; neuroprotection ; Biology (General) ; QH301-705.5
Subject code	796
Language	English
Publishing date	2023-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Potential of non- Saccharomyces yeast for improving the aroma and sensory profile of Prokupac red wine

Ivana Karabegović / Marko Malićanin / Bojana Danilović / Jelena Stanojević / Sandra Stamenković Stojanović / Nada Nikolić / Miodrag Lazić

OENO One, Vol 55, Iss

2021 Volume 2

Abstract: This work aimed to analyse the effect of non-Saccharomyces yeasts on the volatile composition, aromatic profile and sensory properties of wine made from autochthonous Serbian grape variety Prokupac (Vitis vinifera). Fermentation was performed with two ... ...

Abstract	This work aimed to analyse the effect of non-Saccharomyces yeasts on the volatile composition, aromatic profile and sensory properties of wine made from autochthonous Serbian grape variety Prokupac (Vitis vinifera). Fermentation was performed with two commercial yeasts, Metschnikowia pulcherrima and Torulaspora delbrueckii, in pure and sequential fermentation with Saccharomyces cerevisiae. The standard analysis of produced wines indicated that the application of both non-Saccharomyces yeast (in pure or in sequential fermentation) significantly reduces the content of alcohol when compared to the control. The use of M. pulcherrima in both pure and sequential fermentation resulted in a higher content of different groups of polyphenols, anthocyanins and flavonoids or better colour characteristics compared to the wines obtained in fermentations with T. delbrueckii. HS-SPME GC/MS analysis revealed the presence of 27 different compounds in the wine samples, with higher alcohols and ethyl esters being the most dominant. It was proven that the presence of non-Saccharomyces yeasts in the initial stage of fermentation with later inoculation with S. cerevisiae contributes to increased complexity of the wine, as well as increased higher alcohol content and total extracts. Wines produced from sequential fermentation with T. delbrueckii showed floral and spice attributes, probably due to 1-pentanol and 2-phenylethanol detected in the wine, as well as to the large amount of ethyl acetate. The use of M. pulcherrima in pure fermentation resulted in wines with the lowest sensorial characteristics (i.e., lacking fruity and floral aroma) probably due to the lowest relative contribution of ethyl esters. The control wine in this study (from pure fermentation with S. cerevisie), had the most intense ‘red berries’ and ‘black berries’ note and low intensity of spices or vegetable aroma, which may be explained by the highest relative contribution of ethyl octanoate and ethyl decanoate. The PCA results also clearly differentiated the ...
Keywords	non- Saccharomyces yeast ; sensory ; Metschnikowia pulcherrima ; Torulaspora delbrueckii ; aroma profile ; Agriculture ; S ; Botany ; QK1-989
Subject code	660
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	International Viticulture and Enology Society
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Modification of light intensity influence essential oils content, composition and antioxidant activity of thyme, marjoram and oregano

Lidija Milenković / Zoran S. Ilić / Ljubomir Šunić / Nadica Tmušić / Ljiljana Stanojević / Jelena Stanojević / Dragan Cvetković

Saudi Journal of Biological Sciences, Vol 28, Iss 11, Pp 6532-

2021 Volume 6543

Abstract: Thymus vulgaris L. (thyme), Origanum majorana L. (marjoram), and Origanum vulgare L. (oregano) were used to determine whether light modification (plants grown under nets with 40% shaded index or in un-shaded open field) could improve the quantity and ... ...

Abstract	Thymus vulgaris L. (thyme), Origanum majorana L. (marjoram), and Origanum vulgare L. (oregano) were used to determine whether light modification (plants grown under nets with 40% shaded index or in un-shaded open field) could improve the quantity and quality of essential oils (EOs) and antioxidant activity. The yield of EOs of thyme, marjoram, and oregano obtained after 120 min of hydrodistillation was 2.32, 1.51, and 0.27 mL/100 g of plant material, respectively. At the same time under shading conditions plants synthetized more EOs (2.57, 1.68, and 0.32 mL/100 g of plant material). GC/MS and GC/FID analyses were applied for essential oils determinations. The main components of the thyme essential oil are thymol (8.05–9.35%); γ-terpinene (3.49–4.04%); p-cymene (2.80–3.60%) and caryophyllene oxide (1.54–2.15%). Marjoram main components were terpinene 4-ol (7.44–7.63%), γ-terpinene (2.82–2.86%) and linalool (2.04–2.65%) while oregano essential oil consisted of the following components: caryophyllene oxide (3.1–1.93%); germacrene D (1.17–2.0%) and (E)-caryophyllene (1.48–1.1%). The essential oil from thyme grown under shading (EC50 value after 20 min of incubation) have shown the highest antioxidant activity – 0.85 mg mL−1 in comparison to marjoram and oregano (shaded plants EC50 19.97 mg mL−1 and 7.02 mg mL−1 and unshaded, control plants EC50 54.01 mg mL−1 and 7.45 mg mL−1, respectively). The medicinal plants are a good source of natural antioxidants with potential application in the food and pharmaceutical industries. For production practice, it can be recommended to grow medicinal plants in shading conditions to achieve optimal quality parameters.
Keywords	Thymus vulgaris L ; Origanum majorana L ; Origanum vulgare L ; Shading ; Quality components ; Biology (General) ; QH301-705.5
Subject code	580
Language	English
Publishing date	2021-11-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
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Article ; Online: Efficiency of Basil Essential Oil Antimicrobial Agents under Different Shading Treatments and Harvest Times

Zoran S. Ilić / Lidija Milenković / Ljubomir Šunić / Nadica Tmušić / Jasna Mastilović / Žarko Kevrešan / Ljiljana Stanojević / Bojana Danilović / Jelena Stanojević

Agronomy, Vol 11, Iss 1574, p

2021 Volume 1574

Abstract: The aim of this study was to determine the antimicrobial activity of essential oils obtained from sweet basil ( Ocimum basilicum L. cv. ‘Genovese’) cultivated in the open field under different shading conditions (red, blue, and pearl nets with a shade ... ...

Abstract	The aim of this study was to determine the antimicrobial activity of essential oils obtained from sweet basil ( Ocimum basilicum L. cv. ‘Genovese’) cultivated in the open field under different shading conditions (red, blue, and pearl nets with a shade index of 50% and full sunlight exposure (control plants)), harvested at different times. The antimicrobial activity of basil essential oils (BEOs) obtained from all samples was determined for four microorganisms, while determinations for an additional five microorganisms included samples from non-shaded plants, plants grown under red and pearl nets, and second harvest of plants grown under blue net. Basil essential oil exhibited antimicrobial activity surpassing the activity of relevant commercial antibiotics regardless of growing conditions in the case of B. cereus , K. pneumoniae and C. albicans , while superior antimicrobial activity was exhibited in the case of essential oils from plants grown under blue nets in the case of S. aureus , E. coli and P. vulgaris . The influence of the application of colored shading nets was highly significant ( p < 0.01) in the cases of all analyzed microorganisms except C. albicans and P. aeruginosa , while the influence of harvest time was proven in the cases of all microorganisms except K. pneumoniae . ANOVA proved that antimicrobial activities are highly dependent on the methods of plant production, shading treatment, and harvest time. Obtained results are discussed in relation to previously determined composition and yield of essential oils from basil grown under shade nets and harvested in different periods.
Keywords	Ocimum basilicum L ; shading ; harvest time ; essential oils ; antimicrobial activity ; Agriculture ; S
Subject code	580
Language	English
Publishing date	2021-08-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Potential of non-<i>Saccharomyces</i> yeast for improving the aroma and sensory profile of Prokupac red wine

Ivana Karabegović / Marko Malićanin / Bojana Danilović / Jelena Stanojević / Sandra Stamenković Stojanović / Nada Nikolić / Miodrag Lazić

OENO One. 2021, v. 55, no. 2

2021

Abstract	This work aimed to analyse the effect of non-Saccharomyces yeasts on the volatile composition, aromatic profile and sensory properties of wine made from autochthonous Serbian grape variety Prokupac (Vitis vinifera). Fermentation was performed with two commercial yeasts, Metschnikowia pulcherrima and Torulaspora delbrueckii, in pure and sequential fermentation with Saccharomyces cerevisiae. The standard analysis of produced wines indicated that the application of both non-Saccharomyces yeast (in pure or in sequential fermentation) significantly reduces the content of alcohol when compared to the control. The use of M. pulcherrima in both pure and sequential fermentation resulted in a higher content of different groups of polyphenols, anthocyanins and flavonoids or better colour characteristics compared to the wines obtained in fermentations with T. delbrueckii. HS-SPME GC/MS analysis revealed the presence of 27 different compounds in the wine samples, with higher alcohols and ethyl esters being the most dominant. It was proven that the presence of non-Saccharomyces yeasts in the initial stage of fermentation with later inoculation with S. cerevisiae contributes to increased complexity of the wine, as well as increased higher alcohol content and total extracts. Wines produced from sequential fermentation with T. delbrueckii showed floral and spice attributes, probably due to 1-pentanol and 2-phenylethanol detected in the wine, as well as to the large amount of ethyl acetate. The use of M. pulcherrima in pure fermentation resulted in wines with the lowest sensorial characteristics (i.e., lacking fruity and floral aroma) probably due to the lowest relative contribution of ethyl esters. The control wine in this study (from pure fermentation with S. cerevisie), had the most intense ‘red berries’ and ‘black berries’ note and low intensity of spices or vegetable aroma, which may be explained by the highest relative contribution of ethyl octanoate and ethyl decanoate. The PCA results also clearly differentiated the analysed samples produced in the sequential, pure and control fermentation trials, leading to the conclusion that the aromatic profile of Prokupac wines produced in sequential fermentation was more complex compared to the wines produced in pure fermentation.
Keywords	Metschnikowia pulcherrima ; Saccharomyces cerevisiae ; Torulaspora delbrueckii ; Vitis vinifera ; anthocyanins ; color ; ethyl acetate ; fermentation ; grapes ; octanoic acid ; odors ; pentanols ; phenylethyl alcohol ; polyphenols ; red wines ; sensory evaluation ; spices ; vegetables ; volatile compounds ; yeasts
Language	English
Publishing place	International Viticulture and Enology Society
Document type	Article
ISSN	2494-1271
DOI	10.20870/oeno-one.2021.55.2.3859
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Intelligent Poly( N -Isopropylmethacrylamide) Hydrogels

Snežana Ilić-Stojanović / Maja Urošević / Ljubiša Nikolić / Djordje Petrović / Jelena Stanojević / Stevo Najman / Vesna Nikolić

Polymers, Vol 12, Iss 1112, p

Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition

2020 Volume 1112

Abstract: Poly( N -isopropylmethacrylamide) (p( N iPMAm)) is one of the lesser known homopolymers that has significant potential for designing new “intelligent” materials. The aims of this work were the synthesis a series of cross-linked p( N iPMAm) hydrogels by ... ...

Abstract	Poly( N -isopropylmethacrylamide) (p( N iPMAm)) is one of the lesser known homopolymers that has significant potential for designing new “intelligent” materials. The aims of this work were the synthesis a series of cross-linked p( N iPMAm) hydrogels by the free radical polymerization method and the application of gamma-ray radiation for additional cross-linking. The synthesized p( N iPMAm) hydrogels were structurally characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The amount of unreacted monomers was analyzed using high pressure liquid chromatography (HPLC) to evaluate conversion of monomers into polymers. The swelling behavior was monitored in dependence of pH and temperature changes. The previous aim of gamma-ray radiation was the further the cross-linkage of the obtained hydrogel sample in the gelatinous, paste-like state, but the gamma-ray radiation caused decomposition. After absorbing irradiation doses, they transformed into the liquid phase. The results obtained by the gel permeation chromatography (GPC) method indicated that only oligomers and monomers were present in the irradiated liquid material, without molecules with a higher average molar mass, i.e., that the decomposition of the hydrogels occurred. Additionally, the irradiated liquid material was analyzed using the static headspace gas chromatography mass spectrometry (HSS-GC/MS) and gas chromatography/flame ionization detection (HSS-GC/FID) methods. The presence of unchanged initiator molecule and a dominant amount of four new molecules that were different from homopolymers and the reactant (monomer and cross-linker) were determined.
Keywords	N -isopropylmethacrylamide ; hydrogel ; swelling kinetics ; gamma irradiation ; decrosslinking ; Organic chemistry ; QD241-441
Subject code	540
Language	English
Publishing date	2020-05-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: ANALYSIS OF EFFICIENCY OF INVESTMENT IN THE EU AGRICULTURAL FUNDS

Bojan Krstić / Tanja Stanišić / Jelena Stanojević

Hyperion Economic Journal, Vol 2, Iss 4, Pp 25-

2014 Volume 32

Abstract: The purpose of this paper is understanding of the importance of financial support for agricultural development and achieved results. The aim is an assessment of the importance of the European Union funds intended for agricultural and rural development. ... ...

Abstract	The purpose of this paper is understanding of the importance of financial support for agricultural development and achieved results. The aim is an assessment of the importance of the European Union funds intended for agricultural and rural development. In accordance with the purpose and objectives of the research, we analyze the efficiency of investment in the European Union agricultural funds. Also, the interdependence between agriculture expenditures from the European Union funds and results achieved in agriculture in the European Union countries is examined in this paper. Homogeneity of the European Union countries, according to agricultural expenditures and agricultural results is analyzed. The results of this research highlight the importance of financial support provided from the European Union funds for agricultural and rural development.
Keywords	agriculture ; expenditures ; results ; indicators ; General Works ; A
Language	English
Publishing date	2014-12-01T00:00:00Z
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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