Facta Universitatis - Series: Physics, Chemistry and Technology最新文献

{"title":"TWO-DIMENSIONAL FLUID MODELING OF DC GLOW DISCHARGE IN ARGON AT LOW PRESSURE","authors":"M. Stankov, A. Jovanović, V. Marković, S. Stamenković","doi":"10.2298/FUPCT1503153S","DOIUrl":"https://doi.org/10.2298/FUPCT1503153S","url":null,"abstract":"The modeling of DC glow discharge in argon at the pressure and inter-electrode distance was performed for different voltages and glow currents. For the first time, argon glow discharge is modeled using a two dimensional (2D) fluid model with non-local ionization. A detailed numerical procedure for 2D fluid modeling is given. The 2D profiles of particles number densities and electric potential obtained from the fluid model with non-local ionization and the simple fluid model are presented and compared. DVODIMENZIONI FLUIDNI MODEL JEDNOSMERNOG TINJAVOG PRAŽNJENJA U ARGONU NA NISKOM PRITISKU U radu je izvrseno modelovanje jednosmernog tinjavog pražnjenja u argonu na pritisku i medjuelektrodnom rastojanjupri razlicitim vrednostima primenjenih napona i radnih struja tinjavog pražnjenja. Po prvi put je modelovano tinjavo pražnjenje u argonu dvodimenzionim fluidnim modelom sa nelokalnom jonizacijom. U radu je data detaljna procedura za 2D fluidni model. Osim toga, izracunate su i  uporedjene 2D raspodele koncentracija cestica i elektricnog potencijala dobijenih pomocu fluidnog modela sa nelokalnom jonizacijom i  jednostavnog  fluidnog modela. HIGHLIGHTS The modeling of DC glow discharge in argon was performed for different voltages and glow currents; Glow discharge was modeled using the two-dimensional (2D) simple fluid model and the fluid model with non-local ionization; A detailed numerical procedure for 2D fluid modeling is given; 2D profiles of the particle number densities and the electric potential obtained from the fluid model with non-local ionization and the simple fluid model are presented and compared.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"23 1","pages":"153-162"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81273932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A NOTE ON THE BIOSYNTHESIS OF LONG-CHAIN 3-METHYL-2-ALKANONES FROM THE ROOT ESSENTIAL OIL OF INULA HELENIUM L. (ASTERACEAE)","authors":"Marija Gencic, N. Radulović","doi":"10.2298/FUPCT1502083G","DOIUrl":"https://doi.org/10.2298/FUPCT1502083G","url":null,"abstract":"A predominantly odd-numbered, Gaussian-like distribution of the relative amounts of 3-methyl-2-alkanones, from I. helenium root essential oil, was observed. This distribution pattern indicates that their biosynthesis is related to that of fatty acids and related compounds. Simple (non-branched) 2-alkanones also show an odd carbon number prevalence in plants and other organisms, and it was shown that their biosynthesis indeed proceeds via the acetate pathway. In this paper, we propose three possible biosynthetic pathways by which 3-methyl-2-alkanones could be formed in the plant tissues. The essential distinction between them lies in the way the branching methyl group is introduced. The Gaussian parameter σ for the observed distribution of these ketones could be interpreted as the error introduced by the first elongase enzyme system involved in the biosynthesis of fatty acid-derived compounds. BIOSINTEZA 3-METIL-2-ALKANONA DUGOG UGLJOVODONICNOG LANCA IZ ETARSKOG ULJA KORENA BILJNE VRSTE INULA HELENIUM L. (ASTERACEAE) 3-Metil-2-alkanoni dugog ugljovodonicnog lanca su nađeni u etarskom ulju korena biljne vrste I. helenium L. Uocena je Gausova raspodela njihovih relativnih kolicina, pri cemu su homolozi sa neparnim brojem C-atoma bili zastupljeniji. Ovakva raspodela ukazuje na to da njihova biosinteza protice veoma slicno kao i biosinteza masnih kiselina i srodnih jedinjenja. 2-Alkanoni sa neparnim brojem C-atoma su, takođe, zastupljeniji kod biljaka i ostalih organizama, a za njih je dokazano da zaista nastaju po gore pomenutom acetatnom biosintetskom putu. Imajuci sve ovo u vidu, predložili smo tri moguca biosintetska puta kojim bi 3-metil-2-alkanoni mogli nastati u biljnim tkivima. Osnovna razlika između predloženih puteva je u nacinu na koji se uvodi metil racva. Gausov parametar σ uocenih raspodela kolicina alkana bi se mogao posmatrati kao greska prvog enzimskog sistema elongaze koji ucestvuje u biosintezi masnih kiselina i jedinjenja koja se iz njih izvode. HIGHLIGHTS Homologous 3-methyl-2-alkanones (C 11 –C 19 ) detected in Inula helenium root essential oil had a predominantly odd-numbered Gaussian-like distribution. This specific distribution pattern indicates that their biosynthesis most likely proceeds via the acetate pathway. There are three possible biosynthetic pathways, with a different mode of introducing the methyl branch, by which 3-methyl-2-alkanones could be produced. The observed Gaussian parameter σ could be interpreted as the error of the first elongase enzyme system involved in the biosynthesis of fatty acid-derived compounds.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"66 1","pages":"83-89"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78141107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of four flat plate reflectors on light energy-harvesting system characteristics","authors":"Ljiljana Kostić, Z. Pavlović, Stojanovic Krasic","doi":"10.2298/FUPCT1503171K","DOIUrl":"https://doi.org/10.2298/FUPCT1503171K","url":null,"abstract":"In this paper, the effect of four flat panel reflectors (bottom, top, left and right side reflectors) on the total light radiation on a small-size photovoltaic cell is analyzed. An analytical model for the determination of the optimum inclination angle of the reflectors with respect to the cell’s horizontal surface is presented. The optimal angle was calculated to be 66°. The calculated value was experimentally verified by measuring the short-circuit current of the cell. It was shown that the increase in the short-circuit current of the cell with reflectors in the optimal position was about 60% for the illumination levels between 10 lx and 1000 lx. The cell with reflectors was used to charge the primary capacitor in the energy harvesting circuitry of the wireless sensor node and it was demonstrated that the time needed for the cell to charge the primary capacitor could be reduced 35-40%. UTICAJ CETIRI RAVNA REFLEKTORA NA KARAKTERISTIKE SISTEMA KOJI SE AUTONOMNO NAPAJA ENERGIJOM SVETLOSTI U radu je analiziran uticaj cetiri ravna reflektora (donji, gornji, levi i desni bocni reflektor) na ukupno svetlosno zracenje koje dospeva na solarnu celiju malih dimenzija. Dat je analiticki model za određivanje optimalnog nagibnog ugla reflektora u odnosu na horizontalnu ravan u kojoj se nalazi solarna celija. Izracunati optimalni ugao iznosi 66 °. Izracunata vrednost je eksperimentalno proverena merenjem struje kratkog spoja solarne celije i pokazano je da povecanje struje kratkog spoja solarne celije sa reflektorima u optimalnom položaju iznosi oko 60% za nivo osvetljenosti između 10 lx i 1000 lx. Solarna celija je koriscena za punjenje primarnog kondenzatora samonapajajuceg senzora i pokazano je da vreme potrebno za punjenje primarnog kondenzatora može biti smanjeno od 35% do 40%. HIGHLIGHTS The effect of four flat panel reflectors on the total light radiation on a small-size photovoltaic cell was analyzed; An analytical model for the determination of an optimum inclination angle of the reflectors with respect to the cell’s surface is presented; The optimal inclination angle of the reflectors was determined to be 66°; The reflectors in the optimal position could increase the cell’s short-circuit current up to 60%; The charging time of the primary capacitor was reduced for 35-40%.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"14 1","pages":"171-180"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75212361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Causal Closure of Physics and the Formulation of Physicalism","authors":"D. Dimitrijević","doi":"10.2298/FUPCT1501001D","DOIUrl":"https://doi.org/10.2298/FUPCT1501001D","url":null,"abstract":"Physicalism is an ontological doctrine according to which everything in the world is physical in the last instance. This is usually interpreted as a claim that every non-physical, most notably every mental property can either be reduced to some physical property or shown to supervene on it. The main obstacle in an attempt to formulate physicalism properly is Hempel’s dilemma, and the most promising strategy of taking this dilemma is based on the argument from causal closure of physics. After analyzing the strengths and weaknesses of this approach, I argue that it is highly controversial and thus unable to support a strong ontological commitment. UZROCNA ZATVORENOST FIZIKE I FORMULISANJE FIZIKALIZMA Fizikalizam je ontoloska doktrina prema kojoj je sve na svetu u poslednjoj instanci fizicko. Ovo se obicno interpretira kao tvrdnja da se svako nefizicko, a posebno mentalno svojstvo može redukovati na neko fizicko svojstvo, ili se može pokazati da na njemu supervenira. Glavna prepreka pokusajima da se fizikalizam adekvatno formulise je Hempelova dilema, a strategija suocavanja sa ovom dilemom, koja najvise obecava, bazirana je na argumentu uzrocne zatvorenosti fizike. Nakon analize dobrih i losih strana ovog pristupa, zakljucujem da je on jako kontroverzan i da samim tim nije u stanju da podrži snažnu ontolosku tezu. HIGHLIGHTS Physicalism is an ontological thesis according to which everything in the world is physical. Hempel’s dilemma makes it hard to formulate. The argument from causal closure of physics is the most promising physicalist strategy against Hempel’s dilemma. An elaboration of the argument from causal closure of physics based on the fundamental conservation laws and forces is presented. A thorough analysis of this approach indicates that it is highly controversial and unable to support physicalist thesis.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"20 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84312239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GC-MS ANALYSIS OF RAMALINA CAPITATA (ACH.) NYL. EXTRACT","authors":"Ivana Zrnzević, I. Zlatanović, J. Lazarević, O. Jovanovic, G. Stojanović","doi":"10.2298/FUPCT1502091Z","DOIUrl":"https://doi.org/10.2298/FUPCT1502091Z","url":null,"abstract":"This is the first report on the GC-MS profile of the ether-soluble fraction (ESF) of the methanol extract of the lichen Ramalina capitata (Ach.) Nyl . ( Ramalinaceae ). The profile was dominated by orcinol (22.9 %) and its monomethyl ether (30.9 %), which accounted for more than a half of the GC-MS analyzable fraction of ESF. Significantly lower amounts of structurally related sparassol (5.8%) and atraric acid (0.9 %) were also detected. Additionally, ESF contained methyl linoleate, methyl linolenate and methyl palmitate (17.3 %, 7.3 % and 5.0 %, respectively). GC-MS ANALIZA EKSTRAKTA LISAJA RAMALINA CAPITATA (ACH.) NYL. GC-MS profil etarske frakcije (EF) metanolnog ekstrakta lisaja Ramalina capitata (Ach.) Nyl. ( Ramalinaceae ) , predstavljen je po prvi put. GC-MS profilom su dominirali orcinol (22,9%) i njegov derivat – orcinol monometil etar (30,9%), koji su zajedno sacinjavali polovinu EF isparljive/stabilne pod uslovima GC-MS analize. U znacajno manjoj kolicini su detektovani sparasol (5,8%) i atrarna kiselina (0,9%). Takođe, EF je sadržavao metil-linoleat, metil-linolenat i metil-palmitat (17,3%, 7,3% i 5,0%, redom). HIGHLIGHTS Chemical composition of the ether-soluble fraction of the methanol extract of Ramalina capitata was investigated by GC-MS for the first time. Eight compounds were identified representing 97.8%. The most abundant volatiles were orcinol (22.9%) and its monomethyl ether (30.9%). Methyl linoleate was found to be the major ester (17.3%) followed by methyl linolenate (7.3%) and methyl palmitate (5.1%).","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"105 1","pages":"91-97"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79456136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANTIOXIDANT AND ANTIMICROBIAL ACTIVITIES OF THE ESSENTIAL OIL AND SOLVENT EXTRACTS OF MENTHA PULEGIUM L.","authors":"R. Palic, D. J. Ickovski, S. Djordjevic, D. Mitic, P. V. Stankov-Jovanovic, S. Stojanovic","doi":"10.2298/FUPCT1502109P","DOIUrl":"https://doi.org/10.2298/FUPCT1502109P","url":null,"abstract":"We report the total phenolic (TPC; expressed as gallic acid equivalents, GAE, per milligram of dry extract weight) and the total flavonoid contents (TFC; expressed as quercetin equivalents, QE, per milligram of dry extract weight) and antimicrobial and antioxidant activities of the essential oil and hexane, diethyl ether, ethyl acetate and methanol extracts of Mentha pulegium L. (Lamiaceae) collected in Serbia. The total phenolic content was in the range of 129.43-388.29 μg GAE/mg, while TFC ranged from 57.81 to 160.94 QE/mg; the highest TPC and TFC were found in the methanol extract. The antimicrobial activity (against five bacteria and two fungi species) of the essential oil and solvent extracts was assessed using disc-diffusion method. However, the studied samples demonstrated a poor antimicrobial potential. The antioxidant activity was screened using five different tests: 2,2-diphenyl-1-picrylhydrazyl radical scavenging assay (DPPH), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid radical cation decolorization assay (ABTS), total reducing power (TRP), ferric reducing antioxidant power (FRAP) and cupric reducing antioxidant capacity assay (CUPRAC); the methanol extract showed the strongest antioxidant potential. The results of the different antioxidant assays were correlated mutually and with the total flavonoid and total phenolic contents (regression analysis and agglomerative hierarchical clustering). ANTIOKSIDANTNA I ANTIMIKROBNA AKTIVNOST ETARSKOG ULJA I EKSTRAKATA BILJNE VRSTE MENTHA PULEGIUM L. U ovom radu je određen sadržaj ukupnih fenola (TPC; izražen u ekvivalentima galne kiseline, GAE, po miligramu suvog biljnog ekstrakta) i ukupnih flavonoida (TPC; izražen u ekvivalentima kvarcetina, QE, po miligramu suvog biljnog ekstrakta), kao i antimikrobna i antioksidantna aktivnost etarskog ulja i heksanskog, dietil-etarskog, etil-acetatnog i metanolnog ekstrakta biljne vrste Mentha pulegium L. (Lamiaceae; populacija iz Srbije). Sadržaj ukupnih fenola analiziranih uzoraka se kretao u opsegu od 129,43 do 388,29 μg GAE/mg, dok je TFC bio u interval od 57,81 do 160,94 QE/mg; najvise vrednosti za TPC i TFC nađene su za metanolni ekstrakt. Antimikrobna aktivnost (prema pet bakterijskih i dva soja gljivica) etarskog ulja i ekstrakata je određena disk-difuzionom metodom. Proucavani uzorci su imali slabu antimikrobnu aktivnost. Antioksidantna aktivnost je ispitivana pomocu DPPH (2,2-difenil-1-pikrilhidrazil radikal), ABTS (2,2'-azino-bis(3-etilbenzotijazolin-6-sulfonska kiselina radikal katjon), TRP (ukupna redukciona sposobnost), FRAP (sposobnost redukcije feri-jona) i CUPRAC (sposobnost redukcije Cu(II)-jona) metodama; najvisi antioksidantni potencijal je imao metanolni ekstrakt. Rezultati razlicitih metoda za određivanje antioksidantnog potencijala su korelisani međusobno, kao i sa sadržajem ukupnih fenola i flavonoida (regresiona analiza i aglomerativna hijerarhijska klaster analiza). HIGHLIGHTS The essential oil and hexane, diethyl ether, ","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"3 1","pages":"109-119"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73221805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Headspace volatiles of Chaerophyllum aureum L.","authors":"Jelena Stamenković, Ivana R. Radojković, G. Petrovic, G. Stojanović, A. Đorđević","doi":"10.2298/FUPCT1502133S","DOIUrl":"https://doi.org/10.2298/FUPCT1502133S","url":null,"abstract":"Differences in the headspace volatile profiles (HS) of fresh and air-dried fruits, stems and aerial parts of Chaerophyllum aureum L. (Apiaceae) were studied here for the first time using HS-GC-MS (head space – gas chromatography – mass spectrometry). This was done in order to probe to which level HS volatiles of different plant organs were susceptible to air drying. The most dominant headspace volatiles of all samples were monoterpene hydrocarbons. Sabinene was the major volatile of the fresh aerial parts, air-dried fruits, fresh and air-dried stems, representing 47.8%, 31.4%, 67.7% and 73.0% of the total volatiles, respectively. The most abundant headspace volatiles of the fresh fruits were terpinolene (45.3%), γ-terpinene (13.1%) and β-pinene (10.2%). The air-dried aerial parts were characterized by a high amount of limonene (69.0%). The results of HS-GC-MS were subjected to multivariate statistical analysis in order to get a better insight into the similarities/dissimilarities existing between the investigated samples. According to the results of multivariate analysis, the drying process significantly influenced HS volatiles. ISPARLJIVI SASTOJCI BILJNE VRSTE CHAEROPHYLLUM AUREUM L. U ovom radu su, po prvi put, ispitane razlike u headspace profilima (HS) svežih i na vazduhu susenih plodova, stabljika i nadzemnih delova biljne vrste Chaerophyllum aureum L (Apiaceae) pomocu metode HS-GC-MS (headspace – gasna hromatografija – masena spektrometrija). Na osnovu ovih rezultata moglo bi se utvrditi do koliko intenzivnih promena u HS profilima razlicitih delova biljke može doci usled susenja biljnog materijala. U svim uzorcima su dominantni headspace isparljivi sastojci bili monoterpeni. Utvrđeno je da je sabinen bio glavni isparljivi sastojak svežeg nadzemnog dela (47,8%), suvog ploda (31,4%), svežeg (67,7%) i suvog stabla (73,0%). Kao glavni isparljivi sastojci svežeg ploda nađeni su terpinolen (45,3%), γ-terpinen (13,1%) i β-pinen (10,2%), dok je suvi nadzemni deo bio okarakterisan znacajno vecom zastupljenoscu limonena (69,0%). Rezultati HS-GC-MS analize su podvrgnuti multivarijantnoj statistickoj analizi kako bi se dobio bolji uvid u slicnosti/razlike među razmatranim uzorcima. Na osnovu rezultata multivarijantne analize sledi da susenje u velikoj meri utice na HS profil. HIGHLIGHTS Headspace (HS) profiles (percentage compositions) of different parts of Chaerophyllum aureum L. were subjected to multivariate statistical analysis. In all samples, fresh and dry, the most dominant headspace volatiles were monoterpene hydrocarbons. Sabinene was the most abundant volatile of the fresh aerial parts, air-dried fruits, fresh and air-dried stems. The main headspace volatile compound of the fresh fruits was terpinolene while limonene was the major volatile of the air-dried aerial parts.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"57 1","pages":"133-140"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85621256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Iron content in the fruits of the grapevines and peach trees growing near the mining and smelting complex Bor, east Serbia","authors":"S. Tošić, M. Dimitrijević, M. Nujkić","doi":"10.2298/FUPCT1502099A","DOIUrl":"https://doi.org/10.2298/FUPCT1502099A","url":null,"abstract":"The samples of fruits of the grapevine ( Vitis vinifera , cultivar Tamjanika) and the peach tree ( Prunus persica L. Batech ) from the Bor region were analyzed using an ICP-OES to determine the content of iron (Fe). This was done in order to assess possible health risks related to this essential element; the region of Bor’s municipality is known as one of the most polluted areas in Serbia. The content of Fe in unwashed grapes seems not to be affected by the mining/metallurgical activities, as it was either in the normal concentration range or was at even lower than critical deficiency concentration in plants (21.8-98 mg/kg). The level of Fe in the samples of peaches ranged from 62.4 to 1418 mg/kg, which is much higher than that in grape samples and in one case, even higher than the phytotoxic threshold. The values of the enrichment factor (EF) were lower than 2 in the case of grape samples, while for peach samples, these values ranged from rather low (0.99) to extremely high (22.66). Based on the herein obtained results, in the region of Bor, it seems that the cultivation of grapevine should be favored over the cultivation of peach trees. SADRŽAJ GVOŽĐA U PLODOVIMA VINOVe LOZe I BRESKVE KOJE RASTU U BLIZINI RUDARSKO-TOPIONICARSKOG KOMPLEKSA BOR, ISTOCNA SRBIJA Uzorci plodova vinove loze ( Vitis vinifera , sorta Tamjanika) i vinogradarske breskve ( Prunus persica L. Batech) iz regiona Bora su analizirani metodom ICP-OES, kako bi se odredio sadržaj gvožđa (Fe). Analize su vrsene da bi se procenio moguci zdravstveni rizik povezan sa ovim esencijalnim elementom; poznato je da je region Borske opstine jedan od najzagađenijih predela u Srbiji. Cini se da rudarsko-metalurske aktivnosti ne uticu na sadržaj Fe kod vinove loze, jer je isti bio ili u okviru koncentracija normalnih za vecinu biljaka ili cak niži od kriticne koncentracije deficijencije (21.8-98 mg/kg). Koncentracija Fe u uzorcima breskve je bila u opsegu od 62.4-1418 mg/kg, sto je mnogo vise nego u uzorcima grožđa i u jednom slucaju cak iznad granice fitotoksicnosti. Vrednosti faktora obogacenja bile su manje od 2 u slucaju uzoraka grožđa, dok su se kod uzoraka breskve ove vrednosti kretale od niskih (0,99) do ekstremno visokih (22,66). Na osnovu dobijenih rezultata, u borskom regionu, cini se da bi se trebalo forsirati uzgoj grožđa u odnosu na uzgoj breskve. HIGHLIGHTS Iron (Fe) represents one of the key constituents of particulate matter originating from the copper smelter plant in Bor. The influence of anthropogenic activities on the Fe content in the investigated fruits was more obvious and more considerable in the case of peach samples. The concentration of Fe in peach samples was much higher than in grapes, and in one case even higher than the phytotoxic threshold. The content of Fe in grapes was in the range of normal concentrations in plants or, in many cases, lower than the critical deficiency concentration.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"15 1","pages":"99-107"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79228209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE CHEMICAL COMPOSITION OF SEDUM RUPESTRE L. SSP. RUPESTRE EPICUTICULAR WAXES: HORTICULTURAL VERSUS THE NATURAL PLANT HABITAT","authors":"S. Jovanovic, B. Zlatković, G. Stojanović","doi":"10.2298/FUPCT1502077J","DOIUrl":"https://doi.org/10.2298/FUPCT1502077J","url":null,"abstract":"The aim of this study was to mutually compare the chemical compositions of epicuticular waxes of two different Sedum rupestre ssp. rupestre plant material samples. These were collected during the post fructification vegetative stage from the wild-growing (NH) and cultivated populations (HH). Epicuticular waxes (isolated in the form of hexane washings of leaves and stems) were analyzed using GC-MS, GC-FID and 1D- ( 1 H, 13 C) and 2D-NMR analyses. The epicuticular wax of both samples consisted of only two alkanes and one triterpene: hentriacontane (2.9 and 4.7% in NH and HH samples, respectively), tritriacontane (31.8 and 41.3% in NH and HH samples, respectively) and germanicyl formate (61.1 and 50.5% in NH and HH samples, respectively). Based on the obtained results, it seems that the type of habitat (natural or horticultural) does not affect the qualitative but only the quantitative composition of S. rupestre ssp. rupestre epicuticular waxes. HEMIJSKI SASTAV EPIKUTIKULARNOG VOSKA BILJNE VRSTE SEDUM RUPESTRE L. SSP. RUPESTRE : HORTIKULTURNO I PRIRODNO STANISTE Cilj istraživanja je bio određivanje i upoređivanje hemijskog sastava epikutikularnih voskova dva uzorka vrste S.rupestre ssp. rupestre u vegetativnoj fazi nakon plodonosenja sa razlicitih lokaliteta i razlicitih uslova stanista (prirodni, NH, i hortikulturni uslovi, HH). GC-MS, GC-FID i 1D- ( 1 H i 13 C) i 2D-NMR analize su koriscene radi identifikacije i kvantifikacije sastojaka epikutikularnih voskova izolovanih u obliku heksanskih ispiraka listova i stabla. Oba uzorka su sadržala hentriakontan (NH 2,9% i HH 3,4 %), tritriakontan (NH 31,8% i HH 41,3%) i triterpen germanicil-formijat (NH 61,1% i HH 50,5%). Upoređivanjem dobijenih rezultata opaža se da uslovi stanista ne uticu na kvalitativni sastav, ali da postoji razlika u kvantitativnom sastavu epikutikularnih voskova biljne vrste S.rupestre ssp. rupestre . HIGHLIGHTS A comparative analysis of cuticular waxes composition of two Sedum rupestre ssp. rupestre samples was achieved. The major components of both samples (natural habitat, NH and horticulture, HH) were: hentriacontane (C 31 ), tritriacontane (C 33 ) and germanicyl formate (GM). The germanicyl formate structure was determined from the analysis of MS, 1 H and 13 C NMR spectra. Both samples were quite similar in qualitative composition, NH and HH: C 31 (2.9% and 4.72%), C 33 (31.76% and 41.32%) and GM (61.09% and 50.54%). There was a discrepancy in the percentage representation of the main components.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"22 1","pages":"77-82"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85659452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COMPLETE ASSIGNMENT OF 1H- AND 13C-NMR SPECTRA OF ANTHRANILIC ACID AND ITS HYDROXY DERIVATIVES AND SALICYLIC ACID AND ITS AMINO DERIVATIVES","authors":"A. Miltojević, N. Radulović","doi":"10.2298/FUPCT1502121M","DOIUrl":"https://doi.org/10.2298/FUPCT1502121M","url":null,"abstract":"We report on the detailed NMR spectral analyses of amino- or/and hydroxy-substituted benzoic acids: anthranilic (AA), 3-hydroxyanthranilic (3-HAA), 5-hydroxyanthranilic (5-HAA), salicylic (SA), 4-aminosalicylic (4-ASA) and 5-aminosalicylic (5-ASA) acids. According to a literature survey, there are limited, unassigned or even incorrectly assigned spectral data to these benzoic acid derivatives. In order to amend the situation, a complete assignment of 1 H- and 13 C-NMR spectra of these compounds, recorded in perdeuteriodimethyl sulfoxide (DMSO- d 6 ), based on a combination of 1D- and 2D-NMR experiments, including 1 H- 1 H COSY, NOESY, HSQC and HMBC, was performed. POTPUNA ASIGNACIJA 1 H- I 13 C-NMR SPEKTARA ANTRANILNE KISELINE I NJENIH HIDROKSI-DERIVATA I SALICILNE KISELINE I NJENIH AMINO-DERIVATA U ovom radu dati su NMR podaci za antranilnu (AA), salicilnu (SA) i regioizomerne (amino)hidroksibenzoeve kiseline, 3-hidroksiantranilnu (3-HAA), 5-hidroksiantranilnu (5-HAA), 4-aminosalicilnu (4-ASA) i 5-aminosalicilnu (5-ASA) kiselinu. Kako je pretragom literature utvrđeno da su do sada objavljeni NMR podaci za pomenute derivate benzoeve kiseline nepotpuni, neasignirani ili cak i pogresno asignirani, izvrsena je kompletna asignacija signala u 1 H- i 13 C- NMR spektrima snimljenim u deuterisanom dimetil-sulfoksidu (DMSO- d 6 ) kombinovanjem 1 H- i 13 C-NMR sa 1 H- 1 H COSY, NOESY, HSQC i HMBC eksperimentima. HIGHLIGHTS The NMR spectra of anthranilic, 3- and 5-hydroxyanthranilic, salicylic, 4- and 5-aminosalicylic acids were recorded in DMSO- d 6. A literature survey revealed limited, unassigned or even incorrectly assigned spectral data for these amino- or/and hydroxy-substituted benzoic acids. Complete assignment of NMR spectral data was based on a combination of 1 H-and 13 C-NMR 1D- and 2D-experiments ( 1 H– 1 H COSY, NOESY, HSQC, HMBC). The 13 C- 1 H coupling constants, previously unavailable in the literature, were derived from the proton-coupled 13 C NMR spectra. In the 1 H-coupled 13 C NMR spectrum of 5-aminosalicylic acid two signals appeared as second-order multiplets, although first-order ones were expected.","PeriodicalId":12248,"journal":{"name":"Facta Universitatis - Series: Physics, Chemistry and Technology","volume":"69 1","pages":"121-132"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78263660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}