Rad analizira prelijevanja volatilnosti cijena između tržišta dobara i financijskih tržišta u svrhu istraživanja međusobne povezanosti i integracije tržišta te njihovog potencijala pri ...diverzifikaciji rizika portfelja. U radu su analizirane cijene zlata i srebra, cijene nafte te devizni tečajevi eura i britanske funte te je korištena Diebold-Yilmaz metodologija indeksa prelijevanja za visokofrekventne tjedne podatke od 1988. do 2020. godine. Utvrđeno je kako su ukupna prelijevanja među dobrima i deviznim tečajevima 25.7% te se indeks prelijevanja volatilnosti tijekom analiziranog perioda kreće većinom između 25% i 50% s ekstremima tijekom globalne financijske krize i za vrijeme pandemije COVIDa-19. To ukazuje na snažnu integraciju tržišta dobara i financijskih tržišta, pogotovo u kriznim razdobljima. Također, rezultati rada sugeriraju da su kretanja cijene srebra pod najmanjim utjecajem prelijevanja s ostalih tržišta te stoga srebro može poslužiti pri diverzifikaciji rizika. Doprinos rada postojećoj literaturi je sljedeći: Prvo, analizom transmisijskih procesa pokazana su značajna prelijevanja volatilnosti između tržišta roba i deviznih tečajeva, što ukazuje na postojanje integracije između različitih tržišta. Također, analizira se dugi vremenski period te dinamička analiza pokazuje pojačana prelijevanja volatilnosti u periodima globalnih kriza. Drugo, rezultati analize mogu pomoći profesionalnim prognostičarima pri prognoziranju te financijskim analitičarima za pružanje sveobuhvatne investicijske analize. Menadžeri i investitori tako mogu dizajnirati optimalne instrumente zaštite od neželjenih kretanja na financijskim tržištima i tržištima dobara. Investitori imaju koristi od diverzifikacije portfelja, a informacijski sadržaj dobiven analizom prelijevanja volatilnosti može se koristiti za procjenu potencijalnih determinanti budućih povrata prilagođenih riziku, što bi im pomoglo u donošenju odluka o ulaganju.
The paper analyzes price volatility spillovers between commodity and financial markets in order to investigate the interconnectedness and market integration and their potential in portfolio risk diversification. The paper analyzes gold and silver prices, oil prices, and the exchange rates of the Euro and British pound using the Diebold-Yilmaz spillover index methodology for high-frequency weekly data from 1988 to 2020. The total spillovers between commodities and exchange rates were found to be 25.7% and the volatility spillover index during the analyzed period mostly ranged between 25% and 50% with extremes during the global financial crisis and during the COVID-19 pandemic. This indicates a strong integration of commodity and financial markets, especially in crisis periods. Also, the results of the work suggest that silver price movements are least affected by spillovers from other markets and therefore silver can be used to diversify risks. The contribution of the paper to the existing literature is as follows: Firstly, the analysis of transmission processes showed significant volatility spillovers between commodity markets and exchange rates, indicating the existence of integration between different markets. Furthermore, a long period of time is analyzed and the dynamic analysis shows intensified volatility spillovers in global crises periods. Secondly, the results of the analysis can help professional forecasters in forecasting and financial analysts to provide a comprehensive investment analysis. Managers and investors can thus design optimal protection instruments against unwanted movements in the financial and commodity markets. Investors benefit from portfolio diversification, and the information content obtained from volatility spillover analysis can be used to assess potential determinants of future risk-adjusted returns, which would help them make investment decisions.
Provider: - Institution: - Data provided by Europeana Collections- After discovery of the anticancer properties of cisplatin, special attention was devoted to evaluation of gold(III) complexes as ...potential antitumor agents due to the fact that both Pt(II) and Au(III) ions possess the same d8 electronic configuration and preferentially form square-planar complexes. The possible involvement of gold(III)complexes in cancer treatment initiated an interest in the area of gold(III) interactions with different biologically important ligands such as amino acids, peptides and proteins. However, the mechanism of antitumor activity of gold(III) complexes is not yet completely understood and further investigation of this subject is required. A better knowledge of the gold(III) reactions with peptides contributes to the future development of gold(III) complexes as potential antitumor agents and also has importance in relation to the severe toxicity of gold-based drugs. The Introduction part of this thesis highlights recent findings in the field of gold(III) complexes with amino acids, peptides and proteins. The first part of this chapter provides an overview of the gold(III) reactions with amino acids, such as glycine, alanine, histidine, cysteine and methionine, while the second part is mainly focused on the results achieved in the mechanistic studies of the reactions between gold(III) and different peptides and structural characterization of gold(III)-peptide complexes as the final products in these reactions. Finally, the last part of Introduction deals with the reactions of gold(III) complexes with proteins as primary targets for cytotoxic gold compounds (B. Đ. Glišić, U. Rychlewska and M. I. Djuran, Dalton Trans., 41 (2012) 6887-6901). The Results and Discussion deals with spectroscopic and electrochemical investigations of gold(III) reactions with dipeptides containing no heteroatom in the side chain, and with histidine- and methionine-containing dipeptides. Furthermore, resulting gold(III)-peptide complexes were characterized by application of X-ray crystallography. The proton NMR spectroscopy was applied to study the reactions of the dipeptides glycylglycine (Gly-Gly) and glycyl-L-alanine (Gly-L-Ala) with hydrogen tetrachloridoaurate(III) (HAuCl4). All reactions were performed in the pH range 2.00 – 5.00 and at 40ºC. When these reactions were carried out at pH 2.00 and 3.00, the formations of the Au(III)-peptide complexes containing tridentate coordinated Gly-Gly and Gly-L-Ala dipeptides were obsereved. The Au(Gly-Gly-N,N’,О)Cl and Au(Gly-L-Ala-N,N’,О)Cl complexes, as the major products in the investigated reactions, were characterized by 1H and 13C NMR spectroscopy. From the obtained spectroscopic data, it was concluded that coordination of the dipeptides to Au(III) ion occurred through the nitrogen atom of the terminal amino group, the deprotonated peptide nitrogen and the oxygen atom of carboxyl group. The fourth coordination place in these square-planar complexes was occupied by the chloride ion. However, when the reactions of the Gly-Gly and Gly-L-Ala dipeptides with AuCl4￣ were performed at pH > 3.00 (pH 4.00 and 5.00), reduction of Au(III) occured during time and the complete reaction mixture was immediately dark from elemental gold. The Au(Gly-Gly-N,N’,O)Cl complex formation was two times faster (k2 = (1.63 0.07) x 10-7 M-1s-1) than Au(Gly-L-Ala-N,N’,O)Cl (k2 = (0.71 0.06) x 10-7 M-1s-1). Difference in the reactivity between these two peptides was attributed to the steric hindrance of the methyl group of L-alanine. However, the reactions of AuCl4– with Gly-Gly and Gly-L-Ala were one hundred times slower than with glycyl-L-histidine (Gly-L-His) (k2 = (124.00 0.30) x 10-7 M-1s-1) (B. Đ. Glišić, S. Rajković, M. D. Živković and M. I. Djuran, Bioorg. Chem., 38 (2010) 144-148). In the second part of this chapter, two forms of gold(III) complex with Gly-L-His, hydrated Au(Gly-L-His-N,N’,N’’)ClNO3 .1.25H2O and unhydrated Au(Gly-L-His- N,N’,N’’)ClNO3, as well as Au(L-Ala-L-His-N,N’,N’’)ClNO3 .2.5H2O complex were synthesized and characterized by 1H NMR spectroscopy and X-ray crystallography. In these complexes, L-histidine-containing dipeptides were coordinated to Au(III) ion through N3 nitrogen atom of the imidazole ring, deprotonated amide nitrogen and terminal amino group of glycine or L-alanine, while the fourth coordination place was occupied by the chloride ion. As a consequence of the Au…Cl interactions the square-planar coordination of Au(III) ion in Au(Gly-L-His-N,N’,N’’)ClNO3 .1.25H2O, Au(Gly-L-His- N,N’,N’’)ClNO3 and Au(L-Ala-L-His-N,N’,N’’)ClNO3 .2.5H2O complexes is completed to an elongated octahedron by two more distant chloride ions belonging to the neighbouring complexes (U. Rychlewska, B. Warżajtis, B. Đ. Glišić, M. D. Živković, S. Rajković and M. I. Djuran, Dalton Trans., 39 (2010) 8906-8913). Furthermore, the reactions of the monofunctional Au(dien)ClCl2 complex, in which dien is diethylenetriamine tridentate coordinated to Au(III) ion, with L-histidinecontaining dipeptides, namely L-histidyl-glycine (L-His-Gly) and glycyl-L-histidine (Gly- L-His), were studied by application of 1H and 13C NMR spectroscopy. All reactions were performed in aqueous solution in the pD range 3.50 – 5.50 and at ambient temperature. When the reaction of this complex with N-terminal histidine-containing dipeptide, L-His- Gly, was performed in the investigated pD range, strongly selective coordination of the dipeptide through N3 imidazole nitrogen atom to Au(III) was observed, with formation of Au(dien)(L-His-Gly-N3)3+ complex. However, in the reaction with the dipeptide containing C-terminal histidine Gly-L-His, tridentate coordination through the N3, deprotonated amide and amino nitrogen atoms with concomitant detachment of the dien ligand was occured. No coordination of the carboxylate oxygen atom to Au(III) was observed by 13C NMR spectroscopic measurements for investigated reactions under above mentioned experimental conditions (B. Đ. Glišić, S. Rajković and M. I. Djuran, J. Coord. Chem., accepted for publication). Finally, the proton NMR spectroscopy was applied to study the reactions of the dipeptide glycyl-D,L-methionine (Gly-D,L-Met) and its N-acetyl derivative (Ac-Gly-D,LMet) with HAuCl4 complex. The corresponding dipeptide and AuCl4￣ were reacted in 1:1, 2:1 and 3:1 molar ratios. Аll reactions were performed at pH 2.00 in 0.01 mol/dm3 DCl in D2O as solvent and at 25ºC. It was found that the first step of these reactions was very fast coordination of Au(III) to the thioether sulfur with formation of the gold(III)- peptide complex AuCl3(R-Gly-Met-S) (R = H or Ac). This intermediate further reacts with an additional methionine residue to generate the R-Gly-Met chlorosulfonium cation as the second intermediate product, which readily undergoes hydrolysis to give the R-Gly- Met sulfoxide as the final product of this redox process. The oxidation of the methionine residue in the reaction between Gly-D,L-Met and AuCl4– was five times faster (k2 = 0.363 0.074 M-1s-1) in comparison to the same process with N-acetylated derivative of this peptide (k2 = 0.074 0.007 M-1s-1). The difference in the oxidation rates between these two peptides can be attributed to the free terminal amino group of Gly-D,L-Met dipeptide. The mechanism of the reaction between the Gly-D,L-Met dipeptide and AuCl4– was additionally investigated by UV-Vis and cyclic voltammetry (CV) techniques. From these measurements, it was shown that the AuCl2– complex formed in the reaction with equimolar amounts of the reactants showed a strong tendency to disproportionate to AuCl4– and metallic gold. However, in the presence of excess of the dipeptide, the resulting polynuclear Gly-D,L-Met-S-Au(I) and Ac-Gly-D,L-Met-S-Au(I) complexes showed themselves to be quite stable products (B. Đ. Glišić, S. Rajković, Z. Stanić and M. I. Djuran, Gold Bull., 44 (2011) 91-98). The structure of the resulting product of gold(III)- induced oxidation of Gly-D,L-Met dipeptide was confirmed by X-ray crystallography. The crystal structure of H+Gly-D,L-Met sulfoxideAuCl4 consists of discrete square-planar AuCl4anions and glycylmethionine sulfoxide cations. It was shown that the cations are disordered at the methionine side chain due to the presence, at the same crystal site, of two diastereomers differing in their configuration at the triply bonded S atom. The crystallization process of H+Gly-D,L-Met sulfoxideAuCl4 complex is partially diastereoselective, leading to a substantial excess of one of two possible diastereoisomers (U. Rychlewska, B. Warżajtis, B. Đ. Glišić, S. Rajković and M. I. Djuran, Acta Crystallogr., Sect. C: Cryst. Struct. Commun., 66 (2010) 51-54). The results of this thesis can contribute to the development of new gold(III) complexes as potential antitumor agents and also can be important in relation to the severe toxicity of gold-based drugs.- Nakon otkrića antitumorske aktivnosti cisplatine, posebna pažnja je posvećena ispitivanju kompleksa zlata(III) kao potencijalnih antitumorskih agenasa, zbog činjenice da su Au(III) i Pt(II) izoelektronski joni (d8 elektronska konfiguracija) i da formiraju kvadratno-planarne komplekse. Usled potencijalne primene kompleksa zlata(III) u lečenju tumora, u toku poslednjih nekoliko decenija,intenzivno su izučavane reakcije Au(III) jona sa biološki važnim ligandima, kao što su aminokiseline, peptidi i proteini. Mehanizam antitumorskog delovanja kompleksa zlata(III) još uvek nije u potpunosti razjašnjen i predstavlja predmet intenzivnih izučavanja. Ispitivanje reakcija kompleksa zlata(III) sa peptidima je od velikog značaja za definisanje mehanizma antitumorskog i toksičnog delovanja ovih kompleksa. U Opštem delu ove doktorske disertacije dat je pregled najnovijih rezultata postignutih u oblasti ispitivanja reakcija kompleksa zlata(III) sa aminokiselinama, peptidima i
Marxova teorija novca kao robe jedna je od najkontroverznijih, ali i najmanje istraživanih sekcija početnih poglavlja Kapitala. Cilj je rada prezentirati neke njene temeljne postavke, kao i ...interpretacijske aspekte na nekoliko razina. Nakon sažimanja samih osnova te teorije bazirane na primjeni radne teorije vrijednosti, rad propituje njenu relevantnost i primjenjivost u ekonomiji 20. i 21. stoljeća obilježenoj upravo udaljavanjem od, za Marxa ključnih, robnih aspekata novca pomoću uvođenja fiat novca i sli čnih koncepata. To je pitanje razmatrano preko pregleda različitih (re)interpretatora Marxove teorije koji se bave navedenim problemom. Na koncu, preko svega navedeno, moguća je svojevrsna valorizacija teorije.
Ovaj članak govori o zlatu kao kemijskom elementu. Posebna pažnja posvećena je njegovim fizikalno-kemijskim svojstvima i gdje i u kojem obliku se može pronaći u prirodi. Razmatra se uloga koju je ...zlato odigralo u povijesti i donosi se informacije o tome kako je doseglo razinu vrijednosti koju ima danas. Zlato razlomljeno na nanočestice upotrebljivo je u širem spektru procesuiranja, uključujući opću nanotehnologiju, elektroničku prizvodnju i spajanju materijala raznih funkcionalnosti. Važno je znati da se zlato koristi i u industriji, mnogim inženjerskim procesima (kontakti u mikro-elektronici) i medicini (dentalne slitine, implatanti).
Veľké množstvá odpadov z elektrických a elektronických zariadení sa hromadia v celej Európe. Každý spotrebiteľ vyprodukuje priemerne 16 kg tohto odpadu za rok, čo v Európe predstavuje celkovo šesť ...miliónov ton za rok. Ide o obrovské plytvanie zdrojmi. Znamená to taktiež veľké ekologické nebezpečenstvo, keďže elektrické spotrebiče a elektronické zariadenia obsahujú vysoko toxické ťažké kovy a organické znečisťujúce látky. Podľa nových predpisov EÚ budú musieť výrobcovia odteraz platiť za zber a likvidáciu týchto výrobkov. Odpady ušľachtilých kovov Au-Ag predstavujú širokú škálu typov a foriem odpadov s rôznymi balastnými prvkami aj zložkami. Problematika spracovania odpadov s obsahom Au a Ag je vysoko aktuálnou v celosvetovom meradle z hľadiska hodnoty a špecifických vlastností týchto kovov ako aj ich nenahraditeľnosti v oblasti bankovníctva, zdravotníctva, priemyslu a v neposlednom rade aj v samotnej výrobe a predaji zlatníckych výrobkov. Predkladaný návrh možnosti spracovania Au-Ag zlatníckych a elektronických odpadov si kladie za cieľ získať zlato a striebro v kovovej forme. Aplikácia navrhovaného procesu spracovania uvedených Au-Ag odpadov predstavuje pre spoločnosť praktický, ekonomický a zároveň ekologický význam pri ich spracovávaní. Získavanie zlata, resp. striebra z Au-Ag odpadov je mimoriadne dôležité v podmienkach inflačného vývoja, kedy tieto ušľachtilé kovy sú stabilným zdrojom pokrývania potrieb spoločnosti.
Ovaj se rad temelji na sadržajnoj analizi triju stripova Andrije Maurovića rađenih prema trima romanima – Zlatarovo zlato i Čuvaj se senjske ruke Augusta Šenoe te Grička vje- štica Marije Jurić ...Zagorke i usporedbi s navedenim romanima. Maurovićeve stripske adaptacije triju hrvatskih romana Zlatarovo zlato, Čuvaj se senjske ruke i Grička vještica lijep su primjer crtačeva rada u kojima se vide klasični stripski postupci, ali i odmak od te tradicije. U Zlatarovu zlatu Maurović je poštovao književni predložak prema kojemu je strip nastao. Unesene su nužne promjene s obzirom na vrstu medija. To se odnosi na sažimanje radnje, nužno u svakome stripu koji nastaje prema postojećemu predlošku, kao i koncentriranje na pojedine segmente romana. Ljubavna i avanturistička komponenta naglašene su u odnosu na povijesnu i političku koje se spominju samo kao ilustracija. Grič- ka vještica i Čuvaj se senjske ruke duži su stripovi čiji su scenariji vrlo kvalitetni. Strip Zlatarovo zlato žanrovski je moguće odrediti kao ljubavni strip, a Gričku vješticu i Čuvaj se senjske ruke kao avanturističke stripove, uz napomenu da su sva tri stripa i povijesni. Zapleti su u stripovima temeljeni na kontrastima što je u okvirima romantičarskoga diskursa.
Ovaj rad govori o zlatu, od alkemije do nanočestica. Po tematici se može podijeliti u tri dijela. Prvi dio govori
općenito o zlatu: njegovom utjecaju na ljude i okoliš, povijest i tržište zlata te ...korištenje zlata u medicini,
stomatologiji i gospodarstvu te je objašnjena alkemija kao starodrevna vještina. Drugi dio obuhvaća opis
nanotehnologije i nanočestica zlata.Treći dio rada odnosi se na istraživanje o zlatu koje je provedeno
anketiranjem studentske populacije
In der Entwicklung der kroatischen Literatur des 19. Jahrhunderts nimmt August Šenoa eine Schlüsselposition ein. Die Bedeutung Šenoas beruht in erster Linie auf seiner Prosa - Erzählungen und ...historischen Romanen. Absicht der vorliegenden Arbeit ist es, die Geschichtskonzeption Šenoas die in seiner Geschichtsdarstellung zum Ausdruck kommt, am Beispiel seiner drei wichtigsten Romane, sichtbar zu machen.
Uz povijesnu sliku hrvatske prošlosti, roman Zlatarovo zlato prikazuje
lik strastvene žene vođene podivljalim nagonima koja se služi svojim
tijelom kao objektom manipulacije. Klara Grubarova je lik ...nagonske i
privlačne žene koja preko strasnih avantura umiruje svoje mladenačke
požude i neispunjene seksualne maštarije. Klarino božansko tijelo je
uzrok duševne i tjelesne zaluđenosti muškaraca nadopunjavajući svoju
koketnost brižnošću za vlastito dijete te hladnokrvnim otklanjanjem
protivnika sa scene.
V članku je predstavljeno starejšeželeznodobno gomilnogrobišče v Sajevcah na Dolenjskem.Prve gomile so bile odkrite leta 1878, tukaj objavljene najd-be pa izhajajo iz raziskav 1879, ...1902 in iz zaščitnih izkopa-vanj leta 1982. Grobišče je z najdbami in načinom pokopa datiranov 7. st. Podrobneje sta predstavljena dva groba, ki izstopata pokonstrukciji in inventarju, posebej pa še pasna oprava tipa Libnain zlato okrasje.
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