Search results for "Mite"

Electrical treeing in EVA-bohemite and EVA-montmorillonite nanocomposites

2009

The present experimental work focuses on the growth of electrical treeing inside different Ethylene-vinyl acetate (EVA) nanocomposites containing Bohemite (an aluminum oxide hydroxide) and Montmorillonite (a phyllosilicate clay mineral) nanoparticles. Bohemite and Montmorillonite particles have different aspect ratios: the first one has a nanometric cube-like symmetry, while the latter has a typical layered structure. The results evidence that the growth of the electrical treeing inside the original polymer can be altered significantly by the dispersion of inorganic nanoparticles.

Maghemite polymer nanocomposites with modulated magnetic properties

2007

A method is presented for the production of maghemite polymer nanocomposites with modulated magnetic properties. Magnetic nanocomposites prepared using this method show regular variation in the magnetic blocking temperature from 2 K to 300 K, and variation in the saturation magnetization from 0 to 50 emu g � 1 (Fe2O3). The method is based on the in situ formation of maghemite nanoparticles in nitrogen-base polymer matrixes. The particle size can be varied regularly from 1.5 nm to 16 nm by changing the ratio of iron loading in the polymer and/or the Fe(II)/Fe(III) ratios. The particles are isolated and uniformly distributed within the matrix. The mate

Cell Specific Targeting of Multifunctional γ-Fe2O3 Nanoparticles Through Surface Binding of dsDNA

2007

AbstractThe immobilization of polyinosinic-polycytidylic acid [poly(IC)] on ã-Fe2O3 maghemite nanoparticles via the phosphor-amidate route using a multifunctional polymer is reported. The dsRNA coupled nanoparticles were used to visualize the Toll-like (TLR3) receptors at the cell surface. The presence of TLR3 was demonstrated independently in the Caki-1 cell line by RT-PCR and immunostaining techniques

Fabrication of a Silica Coating on Magnetic γ-Fe2O3 Nanoparticles by an Immobilized Enzyme

2008

Silicatein, a hydrolytic protein encountered in marine sponges, was immobilized on maghemite (γ-Fe2O3) nanoparticles that were surface functionalized with a reactive mulfunctional polymer. This polymer carries an anchor group based on dopamine which is capable of binding to the γ-Fe2O3 surface and a reactive functional group which allows binding of various biomolecules onto inorganic nanoparticles. This functional nitrilotriacetic acid (NTA) group allows immobilization of His-tagged silicatein on the surface of the γ-Fe2O3 nanoparticles. The surface-bound protein retains its native hydrolytic activity to catalyze formation of silica through copolymerization of alkoxysilanes Si(OR)4. Functio…

Suivi par diffraction de rayons X “in situ” de l'évolution du paramètre de maille du ferrite nanométrique γ-Fe2O3lors de l'isotherme d'adsorption d'e…

2002

La methode de synthese par chimie douce a ete utilisee pour synthetiser des nanoparticules de maghemite γ-Fe 2 O 3 dans une gamme de taille allant de 9 a 14 nm. Ces poudres, parfaitement cristallisees en phase spinelle, exemptes d'impuretes, avec une stoechiometrie en oxygene parfaitement controlee, ont servi de materiaux modeles pour cette etude. Le parametre de maille de ce materiau (0,8346 nm) s'avere etre non dependant de la taille. Cependant, le suivi en Diffraction de Rayons X in-situ revele des variations de ce parametre avec la modification de la surface en presence de vapeur d'eau. Les phenomenes de chimisorption et de physisorption jouent un role preponderant dans les evolutions o…

2018

Abstract. Here we present a sensitive method to analyze lignin oxidation products (LOPs) in speleothems and cave drip water to provide a new tool for paleo-vegetation reconstruction. Speleothems are valuable climate archives. However, compared to other terrestrial climate archives, such as lake sediments, speleothems contain very little organic matter. Therefore, very few studies on organic biomarkers in speleothems are available. Our new sensitive method allows us to use LOPs as vegetation biomarkers in speleothems. Our method consists of acid digestion of the speleothem sample followed by solid-phase extraction (SPE) of the organic matter. The extracted polymeric lignin is degraded in a m…

Eiropas Cilvēktiesību Tiesas spriedumu saistošais spēks un to īstenošana nacionālā līmenī

2018

ECT, spriedumu saistošais spēks un īstenošana nacionālajā līmenī nemainīgi ir viens no aktuālākajiem jautājumiem cilvēktiesību jomā, ņemot vērā, ka cilvēktiesību nozare nemainīgi turpina attīstīties un pilnveidoties. Tieši ar ECT judikatūru tiek uzturēta Eiropas cilvēktiesību un pamatbrīvību aizsardzības konvencijas, ECK, dzīvošana līdzi laikam, interpretējot to līdzi laikam un mūsdienu starptautiskajai sabiedrībai kā vienotam kopumam, tādejādi iespējams radot priekšstatu par de facto erga omnes efektu ECT spriedumiem. Šobrīd vienota viedokļa neesamības dēļ ECT un Eiropas Padomes Ministru Komitejai, kas veic ECT spriedumu izpildes uzraudzību, nākas saskarties ar dalībvalstu atšķirīgajām nos…

Le reti della buona morte

2017

Il saggio indaga le modalità di rappresentazione della morte a partire da siti internet dedicati e ai "gadget" in vendita on line per il corredo funerario

Materiali ceramici di importazione africana dalla catacomba di Villagrazia di Carini. Un aggiornamento sulla circolazione nel territorio della eccles…

2012

Primo volume della Collana "Quaderni Digitali di Archeologia Postclassica". La catacomba di Villagrazia di Carini è uno dei principali monumenti del primo Cristianesimo siciliano, cimitero di una comunità agiata e aperta alle relazioni con l'area mediterranea. Lo studio proposto in questo volume, partendo dai dati relativi ai materiali ceramici restituiti dalla stratigrafia archeologica dei settori indagati dal 2000 al 2012, testimonia i rapporti commerciali intercorsi fra il territorio servito dalla presenza del complesso catacombale, coincidente con quello dell'ecclesia carinensis citata da Gregorio Magno, e l'Africa romana e protobizantina.

Le concessioni amministrative. Uno strumento antico, capace di rinnovarsi

2020

Il contributo discute la capacità di rinnovamento di alcune concessioni amministrative nell'ambito della dialettica Stato-mercato, pubblico privato.