Search results for "gold"
showing 10 items of 1320 documents
Electrochemical sensor based on rGO/Au nanoparticles for monitoring H2O2 released by human macrophages
2021
Abstract Increased oxidative burden contributes to the pathogenesis of most inflammatory diseases and is associated with aging and chronic inflammation. Macrophages contribute to the generation of reactive oxygen species (ROS) within inflamed tissues. Currently, ROS generation is measured using fluorescent probes and colorimetric/fluorimetric biochemical assays. Hydrogen peroxide (H2O2) diffuses through the cell membrane and can be monitored in the extracellular space. Herein, we present a sensor for H2O2 detection released by cells in culture supernatants. H2O2 sensing performance was evaluated using chronoamperometric detection. A sensitivity of 0.0641 μA μM−1 cm−2 with a limit of detecti…
Engaging with mathematics in the kindergarten. Orchestrating a fairy tale through questioning and use of tools
2013
ABSTRACTThe aim of this study is to analyse how a kindergarten teacher orchestrated a mathematical activity involving a fairy tale. Taking a sociocultural perspective on learning and development, naturally occurring talk-in-interaction has been analysed in order to scrutinise the subtleties of the orchestration. The fairy tale Goldilocks and the Three Bears was used both as context for the activity, but also as a means through which mathematical concepts were engaged with. The analysis shows that the orchestration bears characteristics of questioning and use of tools such as voice, facial expressions, and concrete materials. The orchestration is also characterised by sincere planning in adv…
"Cinquant'anni sono un po' troppi per un bambino prodigio". Appunti per una lettura della "Città morta" di Erich Wolfgang Korngold
2009
Erich Wolfgang Korngold (1897-1957), bambino prodigio nel crepuscolo dell'Impero asburgico e genio in fuga dall'Europa nazista, ottiene il suo più grande successo teatrale con l'opera in tre quadri "Die tote Stadt" (La città morta, 1920). Il saggio traccia un breve profilo biografico dell'autore - anche in rapporto con le opere del periodo americano e con le musiche destinate al cinema di Hollywood - analizzando la genesi, la drammaturgia e i caratteri musicali della "Città morta".
Dal romanzo alla scena: note intorno al personaggio femminile nella commedia settecentesca
1988
Il saggio esamina la rappresentazione del personaggio femminile nel teatro settecentesco, con particolare riferimento alle trasposizioni della "Pamela" di Richardson effettuate da Goldoni e Chiari. The essay examines the female characters' representation in eighteenth century's theatre, with special reference to the transpositions for the stage of Richardson's Pamela by Goldoni and Chiari.
Production and investigation of multiply charged metal clusters in a Penning trap
1996
Singly charged gold cluster ions from a laser-vaporization source are transferred into a Penning trap and subjected to electron bombardment. The charged reaction products are analyzed by time-of-flight mass spectrometry after axial ejection from the trap. They include singly charged cluster fragments, multiply charged clusters of the initial size and multiply charged cluster fragments. The multiply charged clusters are selected and further investigated by collision induced dissociation. Two types of reactions can be distinguished: Dissociation into several charged fragments and evaporation of neutrals. Several features of multiply charged clusters relevant for future investigations are revi…
Change in structure between the $I = 1/2$ states in $^{181}$Tl and $^{177,179}$Au
2018
Abstract The first accurate measurements of the α-decay branching ratio and half-life of the I π = 1 / 2 + ground state in 181Tl have been made, along with the first determination of the magnetic moments and I = 1 / 2 spin assignments of the ground states in 177,179Au. The results are discussed within the complementary systematics of the reduced α-decay widths and nuclear g factors of low-lying, I π = 1 / 2 + states in the neutron-deficient lead region. The findings shed light on the unexpected hindrance of the 1 / 2 + → 1 / 2 + , 181Tl → g 177 Aug α decay, which is explained by a mixing of π 3 s 1 / 2 and π 2 d 3 / 2 configurations in 177Aug, whilst 181Tlg remains a near-pure π 3 s 1 / 2 .…
Nuclear shape transition in neutron-deficient gold isotopes
1987
4 pages, 1 table, 4 figures.
Relaxing cosmological neutrino mass bounds with unstable neutrinos
2020
At present, cosmological observations set the most stringent bound on the neutrino mass scale. Within the standard cosmological model ($\Lambda$CDM), the Planck collaboration reports $\sum m_\nu < 0.12\,\text{eV}$ at 95% CL. This bound, taken at face value, excludes many neutrino mass models. However, unstable neutrinos, with lifetimes shorter than the age of the universe $\tau_\nu \lesssim t_U$, represent a particle physics avenue to relax this constraint. Motivated by this fact, we present a taxonomy of neutrino decay modes, categorizing them in terms of particle content and final decay products. Taking into account the relevant phenomenological bounds, our analysis shows that 2-body deca…
Quintessence, inflation and baryogenesis from a single pseudo-Nambu-Goldstone boson
2007
15 pages, 3 figures.-- ISI Article Identifier: 000250759700079.-- ArXiv pre-print available at: http://arxiv.org/abs/0707.3999
Development of new CdZnTe detectors for room-temperature high-flux radiation measurements
2017
Recently, CdZnTe (CZT) detectors have been widely proposed and developed for room-temperature X-ray spectroscopy even at high fluxes, and great efforts have been made on both the device and the crystal growth technologies. In this work, the performance of new travelling-heater-method (THM)-grown CZT detectors, recently developed at IMEM-CNR Parma, Italy, is presented. Thick planar detectors (3 mm thick) with gold electroless contacts were realised, with a planar cathode covering the detector surface (4.1 mm × 4.1 mm) and a central anode (2 mm × 2 mm) surrounded by a guard-ring electrode. The detectors, characterized by low leakage currents at room temperature (4.7 nA cm−2 at 1000 V cm−1), a…