Search results for "Icon"

Ferricytochrome c encapsulated in silica hydrogels: correlation between active site dynamics and solvent structure.

2003

Ferricytochrome c encapsulated in silica hydrogels has been prepared by the sol-gel technique following, with some modifications, the procedure originally developed by Ellerby et al. (Science 255 1113 (1992)). A suitable preparation of hydrogels enables having both 'wet' and 'dry' samples. Wet samples have a high water content: as the temperature is lowered below approximately 260 K, water freezes and the samples crack. On the contrary, dry samples have a low water content (hydration h approximately equal 0.35): in these conditions water does not freeze even at cryogenic temperatures and the samples remain transparent and non-cracking. The dynamics of ferricytochrome c and its dependence on…

Interactions of silica nanoparticles with lung epithelial cells and the association to flotillins

2012

Amorphous silica nanoparticles (aSNPs) gain increasing popularity for industrial and therapeutic claims. The lung with its surface area of 100-140 m(2) displays an ideal target for therapeutic approaches, but it represents also a serious area of attack for harmful nanomaterials. The exact nature of the cytotoxic effects of NPs is still unknown. Furthermore, cellular pathways and the destiny of internalized NPs are still poorly understood. Therefore, we examined the cytotoxicity (MTS, LDH) and inflammatory responses (IL-8) for different-sized aSNPs (30, 70, 300 nm) on our lung epithelial cells line NCI H441 and endothelial cell line ISO-HAS-1. Additionally, colocalization studies have been c…

Is tubulin the sole antigen recognized by a putative anti-bursicon antibody?

1999

Abstract A 56-kDa polypeptide suspected to be the tanning hormone `bursicon' was analyzed using the monoclonal antibody (mAb) 01C10 of Song and Ma. We studied the beetle Tenebrio molitor, for which data on bursicon have been recently published. After purification by two-dimensional gel electrophoresis of brain proteins, the immunoreactive 56-kDa polypeptide was trypsinated and microsequenced. The obtained sequences revealed a high homology with α- and β-tubulins. In a complementary study, immunoreactive clones were isolated, using the 01C10 mAb, from a library in expression vector obtained from Drosophila melanogaster head cDNAs. Again, the isolated clones were found, after cDNA sequencing,…

In vivo comparison of a granular and putty form of a sintered and a non-sintered silica-enhanced hydroxyapatite bone substitute material

2019

Improved handling characteristics of bone substitute materials may facilitate surgical handling. However, the respective modifications should not alter the biological activity. For comparison of a ...

A logarithmic multi-parameter model using gas sensor main and cross sensitivities to estimate gas concentrations in a gas mixture for SnO2 gas sensors

2007

Abstract In a metal-oxide semiconductor gas sensor, the sensitivity of the metal-oxide resistance to concentrations of reducing gases in the surrounding atmosphere is known to be related to adsorption and desorption of gas on the redox reactions between the gas and oxygen. Changes in the electric conductance due to these reactions were measured for tin dioxide semiconductor gas sensors. In this study, we propose a model of gas sensor responding behaviour using a relationship between sensor conductance and gas concentrations in a mixture. A least-squares method fit of measured data was applied to determining the values of coefficients. The proposed method uses main and cross sensitivities th…

Properties of titanium dioxide

2021

"Properties of titanium dioxide" presents a survey of the main physicochemical properties of TiO2 upon which rely all of the applications of this material. Structures and morphologies of titanium dioxide have been taken into account, also in correlation with thermodynamic properties. Bulk and surface defectivity has been described in detail, because of its relevant consequences in terms of catalytic activity. The basic mechanisms of interaction between photons and TiO2 have been discussed on the basis of the optoelectronic features of the semiconductor. Finally, electrical, mechanical, and rheological properties of TiO2 have been presented.

Green Oxidation of Alcohols to Carbonyl Compounds by Heterogeneous Photocatalysis

2010

Low-Temperature Atomic Layer Deposition of High-k SbOx for Thin Film Transistors

2022

SbOx thin films are deposited by atomic layer deposition (ALD) using SbCl5 and Sb(NMe2)3 as antimony reactants and H2O and H2O2 as oxidizers at low temperatures. SbCl5 can react with both oxidizers, while no deposition is found to occur using Sb(NMe2)3 and H2O. For the first time, the reaction mechanism and dielectric properties of ALD-SbOx thin films are systematically studied, which exhibit a high breakdown field of ≈4 MV cm−1 and high areal capacitance ranging from 150 to 200 nF cm−2, corresponding to a dielectric constant ranging from 10 to 13. The ZnO semiconductor layer is integrated into a SbOx dielectric layer, and thin film transistors (TFTs) are successfully fabricated. A TFT with…

The ultimate message : a study of medieval tombstones in ducal Burgundy : 12th-16th centuries

2011

The tombstone has long been neglected by historians. As obituaries and wills, tombstones reveal as much the relationship of the deceased to death that the management of their memory by their heirs. This study first shows the wealth of medieval Burgundy graves goods. Typological diversity adds to the richness of iconography with large amounts of effigial monuments. Tombs materialize burial of prestige. Originally reserved for prelates and princes, burial ad ecclesiam progressively extended to the feudal aristocracy and the bourgeoisie. The location and the materialization of a burial monument also reflect the evolution of medieval piety. Epigraphy and iconography show the mutation of "gothic…

El tondo cerámico con el martirio de San Lorenzo: problemas historiográficos en torno a una pintura inédita de Josep Sanchís

1992

SOBRE EL DINTEL DE LA PUERTA PRINCIPAL DEL LLAMADO "L'HORT DE CARRERES" DE CARCAIXENT (VALENCIA) SE ENCUENTRA UN TONDO DE PINTURA CERAMICA EN EL QUE SE REPRESENTA EL MARTIRIO DE SAN LORENZO. SU FORMATO CIRCULAR ES EXCEPCIONAL DENTRO DE LA PRODUCCION CERAMICA DEL PERIODO ACADEMICO CLASICISTA. ESTA FIRMADO POR JOSEP SANCHIS (DOCUMENTADO ENTRE 1804 Y 1829), PINTOR CERAMICO VINCULADO A LAS REALES FABRICAS DE AZULEJOS DE VALENCIA. ENCARGADO PROBABLEMENTE POR LORENZO CARRERES GILABERT, EL TONDO PARECE INSPIRADO EN EL FRESCO DEL MARTIRIO DE SAN VICENTE PINTADO POR BARTOLOME MATARANA ENTRE 1597 Y 1605 EN EL CRUCERO DE LA IGLESIA DEL COLEGIO DEL PATRIARCA DE VALENCIA, LO QUE SUPONE EL ACERCAMIENTO A…