Search results for "LIES"

High field magnetization of the colloidal Mn–Zn ferrite

1999

Abstract The magnetic properties of a hydrocarbon based colloid (stabilized by oleic acid) of polydisperse chemically co-precipitated Mn 0.5 Zn 0.5 Fe 2 O 4 particles are discussed in the paper. Two fractions are separated from an initial ferrofluid sample by centrifugation. X-ray diffraction measurements show the crystal structure of the particles and a broadened shape of the diffraction lines. Mean particle diameters 6.2 nm (the light fraction) and 9.7 nm (the heavy one) were determined by TEM measurements. The magnetization of the colloids is measured by VSM up to 12 T. A significant slope in the magnetization curves in the high field region is displayed for both samples in the temperatu…

Meristic variation and skeletal anomalies of wild and reared sharpsnout seabream juveniles (Diplodus puntazzo , Cetti 1777) off coastal Sicily, Medit…

2003

Experimental research of surfaced nanoparticle thermal transport in a porous medium

2018

Abstract Experimental research on thermally induced nanocolloid transport in a porous environment is presented. Addition of excess surfactant to a colloid with dispersed phase made of surfaced nanoparticles results in a decrease of effective Soret coefficient in a porous environment. It is shown that with sufficient amounts of surfactant added, this effect extends to a reversal of nanoparticle thermophoretic transport direction, and that the effect shows a tendency of saturation. A mechanism of thermal transport that involves slip velocity of surfactant molecules appearing near pore walls is evaluated as a possible cause of the decrease of Soret coefficient. Effects of temperature on partic…

Water-Soluble Aza-BODIPYs: Biocompatible Organic Dyes for High Contrast In Vivo NIR-II Imaging

2020

International audience; A simple NIR-II emitting water-soluble system has been developed and applied in vitro and in vivo. In vitro, the fluorophore quickly accumulated in 2D and 3D cell cultures and rapidly reached the tumor in rodents, showing high NIR-II contrast for up to 1 week. This very efficient probe possesses all the qualities necessary for translation to the clinic as well as for the development of NIR-II emitting materials.

“Gli Alleati sono venuti prima per fare la guerra”. Guerra, emergenza alimentare e conflitto sociale in Sicilia (1943-1945)

2015

La storiografia ha da tempo evidenziato il rapporto tra il crollo delle “basi di massa del fascismo” (Gallerano) e l’incapacità del regime, negli ultimi anni del conflitto, di trovare soluzioni alle difficoltà negli approvvigionamenti. Soprattutto nelle campagne meridionali, fame e miseria – effetti tangibili della guerra totale – determinarono insieme alle sconfitte subite in Africa e ai pesantissimi bombardamenti alleati, una diffusa disaffezione verso il regime. Non a caso, la promessa della fine dei razionamenti e della fame costituì uno degli elementi principali della propaganda anglo-americana in vista dello sbarco del luglio ‘43. E in effetti, nelle parole dei testimoni, al ricordo d…

Excluyentes y comprensivos : la política universitaria de Ruiz-Giménez, 1951-1956

2006

Se estudian las familias políticas del partido único de la dictadura de Franco a finales de los años cuarenta y en los años cincuenta. Se trata la trayectoria de Ruiz-Giménez, ministro de educación entre 1951 y 1956, las reformas universitarias que introdujo, así como las "inquietudes" de los estudiantes de la generación de los años cincuenta, germen de una nueva política de intelectuales jóvenes contra la dictadura. We study the one-party political families of the Franco dictatorship in the late forties and fifties. We analyze the trajectory of Ruiz-Giménez, minister of education between 1951 and 1956, the university reforms introduced and the "concerns" of students in the generation of th…

Self-Assembly-Directed Organization of a Fullerene–Bisporphyrin into Supramolecular Giant Donut Structures for Excited-State Charge Stabilization

2021

Functional materials composed of spontaneously self-assembled electron donor and acceptor entities capable of generating long-lived charge-separated states upon photoillumination are in great demand as they are key in building the next generation of light energy harvesting devices. However, creating such well-defined architectures is challenging due to the intricate molecular design, multistep synthesis, and issues associated in demonstrating long-lived electron transfer. In this study, we have accomplished these tasks and report the synthesis of a new fullerene–bis-Zn-porphyrin e-bisadduct by tether-directed functionalization of C60 via a multistep synthetic protocol. Supramolecular oligom…

Core (XUV/VUV) and boundary (UV/vis/IR) plasma spectroscopy in fusion devices

2021

This contribution describes the basic applications of passive optical emission spectroscopy in the visible and far-UV region of electromagnetic radiation to diagnostics of the magnetic confinement fusion plasma. To simplify and condense the broad topic it presents the most common ways of analyzing the spectra of atoms, ions and molecules in fusion plasma and disseminating results of those analysis to the non-spectroscopists. It provides the reasons for choosing some particular regions, elements and charge states to determine the impurity content and plasma-surface interactions in MCF (Magnetic Confinement Fusion) reactor. Examples used in the contribution are predominantly from measurements…

How Proximal Nucleobases Regulate the Catalytic Activity of G-Quadruplex/Hemin DNAzymes

2018

International audience; G-quadruplexes (G4s) are versatile catalytic DNAs when combined with hemin. Despite the repertoire of catalytically competent G4/hemin complexes studied so far, little is known about the detailed catalytic mechanism of these biocatalysts. Herein, we have carried out an in-depth analysis of the hemin binding site within the G4/hemin catalysts, providing the porphyrinic cofactor with a controlled nucleotidic environment. We intensively assessed the position-dependent catalytic enhancement in model reactions and found that proximal nucleobases enhance the catalytic ability of the G4/hemin complexes. Our results allow for revisiting the mechanism of the G4/hemin-based ca…

Importance of denitrifiers lacking the genes encoding the nitrous oxide reductase for N2O emissions from soil

2010

Analyses of the complete genomes of sequenced denitrifying bacteria revealed that approximately 1/3 have a truncated denitrification pathway, lacking the nosZ gene encoding the nitrous oxide reductase. We investigated whether the number of denitrifiers lacking the genetic ability to synthesize the nitrous oxide reductase in soils is important for the proportion of N2O emitted by denitrification. Serial dilutions of the denitrifying strain Agrobacterium tumefaciens C58 lacking the nosZ gene were inoculated into three different soils to modify the proportion of denitrifiers having the nitrous oxide reductase genes. The potential denitrification and N2O emissions increased when the size of ino…