Search results for "gold"

CO Oxidation on Cationic Gold Clusters: A Theoretical Study

2008

Aiming at understanding the elementary steps governing the oxidation of CO catalyzed by dispersed or supported gold nanoclusters, the reactivity of molecular species, such as O2 and CO, on neutral and positively charged Au13 clusters have been studied using a DFT approach. Two CO oxidation mechanisms have been simulated, involving respectively the adsorption of CO and O2 on adjacent catalytic sites (two-sites mechanism) and the competitive interaction of the reactants on the same site (single-site mechanism). It is demonstrated that in the former scheme a definite interaction of CO and O2 with both the charged and neutral cluster is effective, but that a chemical reaction between the adsorb…

Is it time to consider visual feedback systems the gold standard for chest compression skill acquisition?

2017

Colloidal Self-assembled Nanosphere Arrays for Plasmon-enhanced Light Trapping in Thin Film Silicon Solar Cells

2014

To realize high-efficiency thin-film silicon solar cells it is crucial to develop light-trapping methods that can increase absorption of the near- bandgap light in the silicon material. That can be achieved using the far-field scattering properties of metal nanoparticles (MNP) sustaining surface plasmons. The MNPs should be inserted in the back of the cell, embedded in the transparent conductive oxide (TCO) layer which separates the rear mirror from the silicon layers. In this way, a plasmonic back reflector (PBR) is constructed that can redirect light at angles away from the incidence direction and thereby increase its path length in the cell material. In this work, a novel technique is pr…

Golden Face Covers from the North Pontic Region: Analysis of the Archaeological Material

2021

Women in contemporary English drama translation: enhancement and downplay mechanisms to portray Golden Age damas

2011

In the last two decades British and American drama translators have shown a growing interest in the Spanish classics, resulting in English versions exclusively intended for the stage. Within this particular context, this paper is intended to provide a general view on how a motif present in the source texts, i.e. the role of women, is transferred into the target plays. A close analysis of the translated works reveals how women’s acts can be enhanced or downplayed in order to accommodate them to the recipient culture. Hence, political correctness, reaction to male domination, moral squeamishness and honour emerge as important elements to be taken into account. Conclusions will ultimately prov…

Imagen e iconografía en las exequias del príncipe Baltasar Carlos en Zaragoza en 1646.

2014

ABSTRACT: This article studies the ceremonial funeral rites for Prince Baltasar Carlos of Austria, son of Philip IV and the hope for the healing of a monarchy in crisis, in the exequies celebrated in the city of Zaragoza, where the young heir to the throne died shortly before his seventeenth birthday, in 1646. The monumental catafalque erected in the plaza of the market place (a fantastic ephemeral tumulus characterized by a splendid Baroque architecture full of symbols), demonstrates the magnificence with which the death of such a beloved prince was presented to the public, in the second third of the seventeenth century. KEYWORDS: Prince Baltasar Carlos of Austria, Spanish Golden Age, roya…

Quantification of the Raf-C1 Interaction With Solid-Supported Bilayers

2002

By use of the quartz crystal microbalance technique, the interaction of the Raf-Ras binding domain (RafRBD) and the cysteine-rich domain Raf-C1 with lipids was quantified by using solid-supported bilayers immobilized on gold electrodes deposited on 5 MHz quartz plates. Solid-supported lipid bilayers were composed of an initial octanethiol monolayer chemisorbed on gold and a physisorbed phospholipid monolayer varying in its lipid composition as the outermost layer. The integrity of bilayer preparation was monitored by impedance spectroscopy. For binding experiments, a protein construct comprising the RafRBD and Raf-C1 linked to the maltose binding protein and a His tag, termed MBP-Raf-C1, wa…

Extracts deriving from olive mill waste water and their effects on the liver of the goldfish Carassius auratus fed with hypercholesterolemic diet

2014

The present research aims to evaluate the beneficial effects of polyphenols derived from waste water from a olive mill, obtained by non-plastic molecular imprinting device, in a hypercholesterolemic diet on Carassius auratus, commonly known as goldfish that was selected as experimental model. The study was conducted with morphological and histochemical analyses and also the data were supported by immunohistochemical analysis. Results show the beneficial activity of polyphenols with a reduction of the damage in the steatotic group, confirming that they may be suggested in the treatment of diseases by lipid accumulation, and used as any addition in feed for farmed fish, in order to improve th…

Application of X-ray microanalysis to study of the expression of endothelial adhesion molecules on human umbilical vein endothelial cells in vitro

1994

A semi-quantitative procedure is described, which allows the evaluation of expression levels of endothelial adhesion molecules on cultured human umbilical vein endothelial cells (HUVEC) using energy dispersive X-ray microanalysis (EDX). As a model two adhesion molecules, E-selection (CD62E; ELAM-1/endothelial leukocyte adhesion molecule-1) and ICAM-1 (intercellular adhesion molecule-1; CD54), were localized by the use of the silver-enhancement colloidal gold method after stimulation of HUVEC with endotoxin lipopolysaccharide (LPS), tumour necrosis factor (TNF) or a phorbol ester (PMA). The analysis was performed in a scanning electron microscope (SEM) at an accelerating voltage of 15 kV wit…

Aukso vilna ir auksavilnis avinas: antikinių literatūros šaltinių liudijimai ir interpretacija

2018

The Golden Fleece figures in Greek mythology as the objective of the voyage of the Argonauts. The incompatability of the object of the search with the effort invested in its acquisition has furthered discussion of the real meaning of the Golden Fleece, which has generally been accepted to be a metaphor since antiquity. Modernity, especially at the turn of the 19th and 20th centuries, has been productive and inventive in the decipherment attempts of the metaphor’s hidden meaning. A number of interpretation theories has been developed, which, though interesting and wellargumented, are sometimes highly divergent from the interpretation of the Golden Fleece in the ancient sources. A proper unde…