Search results for " Gold"

Computational Experiments with the Roots of Fibonacci-like Polynomials as a Window to Mathematics Research

2022

Fibonacci-like polynomials, the roots of which are responsible for a cyclic behavior of orbits of a second-order two-parametric difference equation, are considered. Using Maple and Wolfram Alpha, the location of the largest and the smallest roots responsible for the cycles of period p among the roots responsible for the cycles of periods 2kp (period-doubling) and kp (period-multiplying) has been determined. These purely computational results of experimental mathematics, made possible by the use of modern digital tools, can be used as a motivation for confirmation through not-yet-developed methods of formal mathematics. peerReviewed

Selective Recognition and Sensing of Succinate vs. Other Aliphatic Dicarboxylates by Thiourea-Functionalized Gold Nanoparticles

2016

Gold nanoparticles functionalized with thiourea moieties have been used as selective colorimetric sensors for the naked-eye detection of succinate versus other aliphatic dicarboxylates, all of them as their TBA salts. The detection process is based on the interparticle aggregation triggered by coordination of the end-carboxylates to the thiourea moieties of two different nanoparticles. This nanoparticle aggregation results in a batochromic shift of the plasmon resonance band and a visual color change from red to blue.

Golden Power, emergenza Covid-19 e spirito del tempo

2020

L’articolo ha ad oggetto l’ampliamento dei poteri speciali del Governo in materia di aziende strategiche (c.d. Golden Power), previsto dalle disposizioni introdotte dal d.l. 8 aprile 2020 n. 23, nell’ambito della produzione normativa legata all’emergenza Covid-19. Nel procedere ad una un’analisi del testo, il lavoro si interroga sul rapporto fra la nuova disciplina e le esigenze poste dalla pandemia, e con il più generale “spirito del tempo” in tema di protezione dei sistemi economici nazionali. The article refers to the enlargement of governmental special powers regarding strategic business entities (so called Golden Power), according to the new rules issued by decree 8 April 2020 n. 23, w…

Anaerobic Degradation of the Invasive Weed Solidago canadensis L. (goldenrod) and Copper Immobilization by a Community of Sulfate-Reducing and Methan…

2023

The weed Solidago canadensis L. poses a global threat to the environment as it spreads uncontrollably on roadsides, in forests, fields, meadows, and farmland. Goldenrod emits toxic substances that suppress other plants on the site, displacing wild ones. Thus, goldenrod conquers huge areas very quickly. The use of herbicides and mechanical methods does not solve the problem of the spontaneous spread of goldenrod. On the other hand, many scientists consider goldenrod as a valuable source of biologically active substances: flavonoids, phenolic compounds, vitamins, etc. In this study, we consider Solidago plants as a promising, free (cheap), and renewable substrate for the production of methane…

Formation and growth of palladium nanoparticles inside porous poly(4-vinyl-pyridine) monitored by operando techniques: The role of different reducing…

2017

In this work we followed the formation of palladium nanoparticles, starting from palladium (II) acetate precursor, inside a poly(4-vinylpyridine-co-divinylbenzene) polymer in presence of different reducing agents. The formation and growth of palladium nanoparticles in presence of H-2 was followed as a function of temperature by simultaneous XANES-SAXS techniques, coupled with DRIFT spectroscopy in operando conditions. It was found that the pyridyl functional groups in the polymer plays a fundamental role in the stabilization of the palladium (II) acetate precursor, as well as in the stabilization of the palladium nanoparticles. The effect of a thermal treatment in alcohol (ethanol and 2-pro…

Structural Characterization of Surfactant-Coated Bimetallic Cobalt/Nickel Nanoclusters by XPS, EXAFS, WAXS, and SAXS

2011

Cobalt nickel bimetallic nanoparticles were synthesized by changing the sequence of the chemical reduction of Co(II) and Ni(II) ions confined in the core of bis(2-ethylhexyl)phosphate (2)., and Ni(DEHP)(2). The reduction was carried out by mixing, sequentially or contemporaneously, fixed amounts of n-heptane solution of Co(DEHP)2 and Ni(DEHP)2 micelles with a solution of sodium borohydride in ethanol at a fixed (reductant)/(total metal) molar ratio. This procedure involves the rapid formation of surfactant-coated nanoparticles, indicated as Co/Ni (Co after Ni), Ni/Co (Ni after Co), and Co + Ni (simultaneous), followed by their slow separation as nanostructures embedded in a sodium bis(2-eth…

Jubileusze małżeńskie świadectwem znaczenia przysięgi małżeńskiej

2017

In recent times thorough changes concerning the treatment of the wedding vows take place. One of the ways to create a positive approach to marriage seems to be a solemn observation of marriage jubilees .The paper deals with the historical process of the development of the forms of observance concerning wedding anniversaries. However the main emphasis is put on the rites of wedding anniversary in post conciliar liturgical books. The reader may also become aware of the idea and history of pilgrimages organized on the occasion of the silver and golden marriage jubilees, considering also a strong and clear testimony to the importance of the wedding vows.

Mākslas pasaules alūzijas Donnas Tartas romānā “The Goldfinch”

2018

Donnas Tartas romāns „The Goldfinch” kopš tā publicēšanas radījis sajūsmas vilni literatūras kritiķos un lasītājos visā pasaulē, piedzīvojot tulkojumu trīsdesmit valodās. Tomēr, izvērtējot iespējamo tulkojumu latviešu valodā, romānā attēlotā mākslas pasaule un alūzijas uz to varētu radīt ievērojamus sarežģījumus romāna tulkotājam. Tādēļ šajā darbā tiek pētītas īpašvārdu alūzijas uz mākslas pasauli, padziļināti apskatot tieši mākslas un literatūras alūzijas, un tiek izdarīti secinājumi par to iespējamo atveidi tulkojumā latviešu valodā, balstoties uz tulkošanas teorijā piedāvātajām stratēģijām un domāšanas modeļiem, ko piedāvā tādi autori kā Ritva Lepihalme, Ričards Tomass, kā arī Stīvens Ha…

Structural characterization of site-modified nanocapsid with monodispersed gold clusters

2017

AbstractHepatitis E Virus-like particles self-assemble in to noninfectious nanocapsids that are resistant to proteolytic/acidic mucosal delivery conditions. Previously, the nanocapsid was engineered to specifically bind and enter breast cancer cells, where successful tumor targeting was demonstrated in animal models. In the present study, the nanocapsid surface was modified with a solvent-exposed cysteine to conjugate monolayer protected gold nanoclusters (AuNC). Unlike commercially available gold nanoparticles, AuNCs monodisperse in water and are composed of a discrete number of gold atoms, forming a crystalline gold core. Au102pMBA44 (Au102) was an ideal conjugate given its small 2.5 nm s…

2019

Ultrasmall polyaminocarboxylate-coated gold nanoparticles (NPs), Au@DTDTPA and Au@TADOTAGA, that have been recently developed exhibit a promising potential for image-guided radiotherapy. In order to render the radiosensitizing effect of these gold nanoparticles even more efficient, the study of their localization in cells is required to better understand the relation between the radiosensitizing properties of the agents and their localization in cells and in tumors. To achieve this goal, post-functionalization of Au@DTDTPA nanoparticles by near-infrared (NIF) organic dyes (aminated derivative of cyanine 5, Cy5-NH2) was performed. The immobilization of organic Cy5-NH2 dyes onto the gold nano…