Search results for "Polar"

Antimicrobial activity of the red palm weevil Rhynchophorus ferrugineus

2011

The red palm weevil, Rhynchophorus ferrugineus (Olivier) (Coleoptera Dryophthoridae), is an important pest of palms. Knowl- edge of both its natural enemies and its defensive mechanisms against predators and microorganisms is important to develop methods for an integrated pest control. Antimicrobial activity of the cuticular surface of adults and larvae, as well as of eggs, of this invasive species was investigated. This activity was tested against the Gram-positive bacteria Bacillus subtilis (Ehrenberg) Cohn and Bacillus thuringiensis Berliner, the Gram-negative bacterium Escherichia coli Escherich, and the entomopathogenic fungi Beauveria bassiana (Balsamo) Vuillemin and Metarhizium aniso…

Current-induced domain wall motion in nanoscale ferromagnetic elements

2011

The manipulation of a magnetic domain wall (DW) by a spin polarized current in ferromagnetic nanowires has attracted tremendous interest during the last years due to fundamental questions in the fields of spin dependent transport phenomena and magnetization dynamics but also due to promising applications, such as DW based magnetic memory concepts and logic devices. We comprehensively review recent developments in the field of geometrically confined domain walls and in particular current induced DW dynamics. We focus on the influence of the magnetic and electronic transport properties of the materials on the spin transfer effect in DWs. After considering the different DW structures in ferrom…

The Dismembered Bodies of Female Saints in Michèle Roberts’s Impossible Saints

2008

The Foreign Female Body as a Symbolic Resource in Marina Warner's "Queen of Sheba"

2008

Marina Warner contaminates different versions of the Queen of Sheba “story” in which the Queen is specifically “a queen of the South” and in which her otherness is impressed on her dark/black body. Warner juxtaposes various narratives with different orders of corporeal readings that can be visibly condensed in the image of the queen as she crosses a (Mediterranean) border/watercourse raising her dress and showing her legs. This image dominates the exotic versions that have been reworked by Warner even within colonial models. Warner shows how the queen’s body becomes a symbolic resource for an ideological conflict that changes perspectives according to the context but that is always fought o…

Ultrafast optics in coherently spinning molecules

2020

This thesis reports on the study of unidirectional rotation of molecules and focuses on the rotational Doppler effect occuring in the course of third-harmonic generation in coherently spinning molecules.The rotational Doppler effect appears when a circularly polarized wave interacts with an anisotropic rotating object. During the interaction, an exchange of angular momentum and energy between the field and the object occurs, leading to a frequency shift of the wave. In this work, the frequency shift of the third-harmonic generated in unidirectionaly rotating molecules has been observed. An anlytical model developped in the mansucript forsees four kinds of frequency shifts depending on the m…

Stratégies de contrôle pour la manipulation spatiale de molécules

2011

Talk given by E. Hertz; National audience

Development of electrodes materials for SOFC fed by natural gas / biogas. Applications to "pre-reforming" and "single-chamber" concepts

2010

Solid Oxide Fuel Cell is a device for “clean” electricity production from chemical energy. The new configuration called “single-chamber” seems to be very attractive with several advantages over bi-chamber conventional configuration: easier manufacturing, lowering of working temperature, possible use of hydrocarbons as fuel… Such configuration involves the development of new electrode materials satisfying new requirements. The evaluation of 7 potential cathode materials through several characterizations has shown that a compromise has to be found since one material does not exhibit all the requested features. A library of 15 supported catalysts (3 metals and 5 supports) was developed. These …

The human protein Hugl-1 substitutes for Drosophila lethal giant larvae tumour suppressor function in vivo

2004

Drosophila lethal giant larvae: (lgl), discs large (dlg) and scribble (scrib) are tumour suppressor genes acting in a common pathway, whose loss of function leads to disruption of cell polarity and tissue architecture, uncontrolled proliferation and growth of neoplastic lesions. Mammalian homologues of these genes are highly conserved and evidence is emerging concerning their role in cell proliferation control and tumorigenesis in humans. Here we investigate the functional conservation between Drosophila lethal giant larvae and its human homologue Hugl-1(Llgl1). We first show that Hugl-1 is lost in human solid malignancies, supporting its role as a tumour suppressor in humans. Hugl-1 expres…

Etude par spectroscopies de RMN 23Na, 31P et 1H : effets de la teneur en sel (NaCl) dans des matrices alimentaires

2008

The reduction of salt (NaCl) content in food has become a matter of public health. However, the multiple functions of salt in food make the reduction of its content difficult. The aim of this work was to demonstrate the applicability of NMR innovative techniques in order to characterise the mobility of sodium ions (distinction between ‘free’ and ‘bound’ sodium), to bring a better understanding of the role of salt in the organisation of the food matrix (in particular phosphorous molecules in dairy systems) and to study impact of salt on the mobility of aroma compounds. In a first step, the 23Na NMR study of iota-carrageenan gels validated the quantification of total sodium (Single-Quantum, S…

PARD3 Inactivation in Lung Squamous Cell Carcinomas Impairs STAT3 and Promotes Malignant Invasion.

2015

Abstract Correct apicobasal polarization and intercellular adhesions are essential for the appropriate development of normal epithelia. Here, we investigated the contribution of the cell polarity regulator PARD3 to the development of lung squamous cell carcinomas (LSCC). Tumor-specific PARD3 alterations were found in 8% of LSCCs examined, placing PARD3 among the most common tumor suppressor genes in this malignancy. Most PAR3-mutant proteins exhibited a relative reduction in the ability to mediate formation of tight junctions and actin-based protrusions, bind atypical protein kinase C, activate RAC1, and activate STAT3 at cell confluence. Thus, PARD3 alterations prevented the formation of c…