Uticaj bele lupine na poboljšanje iskorišćavanja fosfora kod soje u kontrolisanim uslovima

White lupine (Lupinus albus L.) is considered as highly efficient in the P uptake and utilization of sparingly available source of soil phosphorus, due to morphological and physiological adaptations of roots. These plants have short roots with high density of rootlets, which poses a mechanism of the increased biosynthesis and efflux of citrate, which are capable of solubilising complexed aluminium (Al) and iron (Fe) from Al- and Fe-phosphates by chelation, thus increasing the availability of P. The aim of this work was to show that soya bean (Glycine hispida Max) could use a part of P that was mobilised in the lupine rhizosphere under conditions of low availability of P. Plants were grown in a greenhouse, in pots with acid soil and low available P (pH 5,5; 39 mg kg-1 P). White lupine and soya bean were grown as a single crop, as a control, and intercropped as well. The concentration of P in the white lupine leaf (0.20 % P) was significantly higher compared to soya bean (0.14% P) when grown separately (control). Leaf P concentration of soya bean intercropped plants was significantly increased compared to the single crop soya bean plants (around 43%) and reached the concentration obtained for lupine grown as the single crop. The P concetration in intercropped soya bean roots was only slightly increased compared to the single crop, while the highest P concentration occurred in white lupine. Results indicate that intercropping in general, can increase P availability for P-inefficient plants, particularly in acid soils where P from fertilisers can be immobilised due to a high content of Al and Fe.Bela lupina (Lupinus albus L.) pripada grupi biljaka efikasnih u iskorišćavanju fosfora (P) iz kiselih zemljišta, zahvaljujući morfološkoj i fiziološkoj prilagođenosti korenovog sistema. Ove biljke formiraju guste bočne korenove male dužine (klaster korenovi) koji ispoljavaju adaptivni mehnizam povećane biosinteze i efluksa citrata. Citrati, kao jaki helatori, u rizosferi heliraju aluminijum (Al) i gvožđe (Fe) iz nepristupačnih Al- i Fe-fosfata, prevodeći ih tako u oblik pristupačan za biljke. Cilj ovg rada bio je stoga da se pokaže da soja (Glycine hispida Max), gajena u združenoj setvi sa lupinom u uslovima slabe obezbeđenosti zemljišta pristupačnim P, može da iskoristi deo P koji je u zoni korenovog sistema lupine preveden u pristupačni oblik. Biljke su gajene u staklari u sudovima sa kiselim zemljištem, deficitarnim pristupačnim P (pH (u H2O) = 5,5; 39 mg P kg-1 zemljišta). Kao kontrola lupina i soja su gajene odvojeno kao čist usev. Koncentracija P u listu lupine (0,20 % P), bila je statistički značajno veća u odnosu na soju (0,14% P) kada su gajene kao čist usev (kontrola). U združenoj setvi koncentracija P u nadzemnom delu lupine nije se menjala u odnosu na kontrolu, dok se kod soje statistički značajno povećala (oko 43 % povećanja u odnosu na kontrolu). Ovi rezultati ukazuju da ovakav način združene setve može da utiče na poboljšano iskorišćavanje P kod P-neefikasnih biljaka, kao što je soja, posebno u jako kiselim zemljištima u kojima zbog visoke koncentracije Al i Fe postoji opasnost od imobilizacije P iz đubriva

Multi-criteria analysis of soil pollution by heavy metals in the vicinity of the Copper Smelting Plant in Bor (Serbia)

This study highlights the consequences on soil pollution of one hund­red years of manufacturing in the Copper Mining and Smelting Complex RTB-Bor (Serbia). Soil sediments were taken via a probe from the surface layer of the soil at twelve different measuring points. The measuring points were all within 20 km of the smelting plant, which included both urban and rural zones. Soil sampling was performed using a soil core sampler in such way that a core of a soil of radius 5 cm and depth of 30 cm was removed. Subsequently, the samples were analyzed for pH and heavy metal concentrations (Cu, Pb, As, Cd, Mn, Ni and Hg) using different spectrometric methods. The obtained results for the heavy metal contents in the samples show high values: 2,540 mg kg-1 Cu; 230 mg kg-1 Pb; 6 mg kg-1 Cd; 530 mg kg-1 Ni; 1,300 mg kg-1 Mn; 260 mg kg-1 As and 0.3 mg kg-1 Hg. In this study, critical zones of polluted soil were iden­tified and ranked according to their metal contents by the multi-criteria deci­sion method Preference Organization Method for Enrichment Evaluation/Geo­metrical Analysis for Interactive Assistance – PROMETHEE/GAIA, which is the preferred multivariate method commonly used in chemometric studies. The ranking results clearly showed that the most polluted zones are at locations holding the vital functions of the town. Therefore, due to the high bioavail­abi­lity of heavy metals through com­plex reactions with organic species in the sediments, consequences for human health could drastically emerge if these metals enter the food chain

Growth and Nutrient Uptake of Orchardgrass (Dactylis glomerata L.) and Meadow Fescue (Festuca pratensis Huds.) as Affected by Rhizobacteria

A diverse group of soil bacteria found in the rhizosphere which can colonize plant roots and improve plant growth are designated as plant growth promoting rhizobacteria. The aim of this study was isolation and screening of different rhizobacterial strains for plant growth promoting characteristics and their ability to improve growth of two grass species, orchardgrass (Dactylis glomerata L.) and meadow fescue (Festuca pratensis Huds.). The strains investigated, belonging to the genera Azotobacter, Bacillus, Pseudomonas and rhizobial bacteria, showed various plant growth promoting traits, such as phosphate solubilisation, siderophore production, and indole-3-acetic acid (IAA) production. Co-inoculation of meadow fescue with Azotobacter chroococcum A2 and Sinorhizobium meliloti or Pseudomonas sp., and A. chroococcum A5 with S. meliloti, significantly increased shoot dry weight (SDW)(25-33%), as well as total N (26-33%), P (24-31%) and K (26-28%) contents in plants (mg pot-1), compared to uninoculated control. In addition, inoculation of orchardgrass with A. chroococcum strain A1, as well as co-inoculation with B. megaterium and A. chroococcum A1 or A31, significantly increased SDW (51-59%) and total N (54-59%), P (51-74%) and K (49-55%) contents, compared to uninoculated control. Nitrogen percentage in SDW was slightly higher than sufficiency ranges, while K percentage was optimal in all treatments in both species. Phosphorous percentage was lower than sufficiency ranges as a consequence of very low soil P content. The results emphasize the potential of particular rhizobacteria to improve the growth of forage grasses

Bihevioralna namjera učenika u e-učenju tijekom pandemije Covid-19

Due to the appearance of COVID-19, the newly emerged situation has provoked numerous reactions in the field of education, both in the world and in Serbia. Prompted by this problem, the authors of this paper conducted a survey to determine students\u27 behavioural intention, as well as their readiness to use e-learning during the COVID-19 pandemic. E-learning has integrated technology and education and has proven to be a powerful tool that enables the education system to respond to the challenges of modern society. In this research, an online questionnaire was distributed to the students of the University of Belgrade. To process the results, the SEM methodology was employed, which enabled the testing of the proposed hypotheses. The obtained results showed the students’ behavioural intention can be directly and indirectly predicted by the joint influence of the role of authority, innovative orientation, user-friendly learning, expected performance, and quality of e-learning. This knowledge enabled a comprehensive analysis that encompassed the e-learning experiences students gained during a state of emergency.Zbog pojave virusa COVID-19, novonastala situacija izazvala je brojne reakcije u obrazovanju, kako u svetu tako i u Srbiji. Potaknuti ovim problemom, autori ovog rada proveli su istraživanje kako bi utvrdili namjere ponašanja učenika, kao i njihovu spremnost na korištenje e-učenja tijekom COVID-19. E-učenje je integriralo tehnologiju i obrazovanje te se pokazalo kao moćan alat koji obrazovnom sustavu omogućuje da odgovori na izazove modernog društva. U ovom istraživanju studentima Sveučilišta u Beogradu podijeljen je online upitnik. Za obradu rezultata korištena je SEM metodologija koja je omogućila provjeru postavljenih hipoteza. Dobiveni rezultati pokazali su da se Bihevioralna namjera korištenja e-učenja može izravno i neizravno predvidjeti zajedničkim utjecajem uloge autoriteta, inovativne orijentacije, učenja prilagođeno korisniku, očekivanog učinka i kvalitete elektroničkog učenja. Ovo saznanje omogućilo je provođenje sveobuhvatne analize koja je obuhvatila iskustva učenika u e-učenju tijekom izvanrednog stanja

Regulation of Inducible Nitric Oxide Synthase (iNOS) and its Potential Role in Insulin Resistance, Diabetes and Heart Failure

Nitric oxide synthases (NOS) are the enzymes responsible for nitric oxide (NO) generation. NO is a reactive oxygen species as well as a reactive nitrogen species. It is a free radical which mediates several biological effects. It is clear that the generation and actions of NO under physiological and pathophysiological conditions are regulated and extend to almost every cell type and function within the circulation. In mammals 3 distinct isoforms of NOS have been identified: neuronal NOS (nNOS), inducible NOS (iNOS) and endothelial NOS (eNOS). The important isoform in the regulation of insulin resistance (IR) is iNOS. Understanding the molecular mechanisms regulating the iNOS pathway in normal and hyperglycemic conditions would help to explain some of vascular abnormalities observed in type 2 diabetes mellitus (T2DM). Previous studies have reported increased myocardial iNOS activity and expression in heart failure (HF). This review considers the recent animal studies which focus on the understanding of regulation of iNOS activity/expression and the role of iNOS agonists as potential therapeutic agents in treatment of IR, T2DM and HF

From Data to Software to Science with the Rubin Observatory LSST

editorial reviewedThe Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) dataset will dramatically alter our understanding of the Universe, from the origins of the Solar System to the nature of dark matter and dark energy. Much of this research will depend on the existence of robust, tested, and scalable algorithms, software, and services. Identifying and developing such tools ahead of time has the potential to significantly accelerate the delivery of early science from LSST. Developing these collaboratively, and making them broadly available, can enable more inclusive and equitable collaboration on LSST science. To facilitate such opportunities, a community workshop entitled "From Data to Software to Science with the Rubin Observatory LSST" was organized by the LSST Interdisciplinary Network for Collaboration and Computing (LINCC) and partners, and held at the Flatiron Institute in New York, March 28-30th 2022. The workshop included over 50 in-person attendees invited from over 300 applications. It identified seven key software areas of need: (i) scalable cross-matching and distributed joining of catalogs, (ii) robust photometric redshift determination, (iii) software for determination of selection functions, (iv) frameworks for scalable time-series analyses, (v) services for image access and reprocessing at scale, (vi) object image access (cutouts) and analysis at scale, and (vii) scalable job execution systems. This white paper summarizes the discussions of this workshop. It considers the motivating science use cases, identified cross-cutting algorithms, software, and services, their high-level technical specifications, and the principles of inclusive collaborations needed to develop them. We provide it as a useful roadmap of needs, as well as to spur action and collaboration between groups and individuals looking to develop reusable software for early LSST science

MODELING THE INFLUENCE OF EFQM CRITERIA ON EMPLOYEES SATISFACTION AND LOYALTY IN TRANSITION ECONOMY: THE STUDY OF BANKING SECTOR IN SERBIA

The paper presents the results of empirical research on the effects of some criteria of the EFQM excellence model on satisfaction and loyalty of the employees in the banking sector in Serbia. All but one of the hypotheses in the defined model were proven by statistical evaluation of empirical results. The one which could not be proven is the hypothesis of a positive impact of the organization's relationship toward security and society on the business result, which makes specificity of transitional economic conditions in which the studied banking sector operates. Statistical analysis was performed using V.16 LISREL software package where statistical significances of the studied set were defined together with b and t values of the defined paths in the defined model. Researches have shown that criteria of EFQM excellence model can be used to develop and improve the functioning of the banking system in Serbia and develop the TQM practice

SWOT - AHP MODEL FOR PRIORITZATION OF STRATEGIES OF THE RESORT STARA PLANINA

This paper presents the results of integrated SWOT analysis and Multi-criteria Decision Analysis (MCDA) model, employed for defining the development of resort Stara Planina in Eastern Serbia and which was based on final report of previous expert study for this touristic destination. In accordance to defined SWOT factors and sub-factors six resulting strategies were generated as: SO strategies (based on the sub-factors of strengths and opportunities), WO strategy (based on the sub-factors of weaknesses and opportunities), ST strategies (based on the sub-factors of strengths and threats) and WT strategy (based on the sub-factors of weaknesses and threats). Relative importance weights of the SWOT factors and sub-factors were obtained by Analytic Hierarchy Process (AHP) model, as well as the ranking of identified strategies was performed by several experts. The results indicate that following sequence of strategies: SO1 → SO2 → ST1 → ST2 → WO1 → WT1, should be realized to complete the main goals for strategic development of the touristic destination Stara Planina