Identification of hidden orbital contributions in the La_{0.65} Sr_{0.35} MnO_{3} valence band

Hybridization of electronic states and orbital symmetry in transition metal oxides are generally considered key ingredients in the description of both their electronic and magnetic properties. In the prototypical case of La_{0.65} Sr_{0.35} MnO_{3} (LSMO), a landmark system for spintronics applications, a description based solely on Mn 3d and O 2p electronic states is reductive. We thus analyzed elemental and orbital distributions in the LSMO valence band through a comparison between density functional theory calculations and experimental photoelectron spectra in a photon energy range from soft to hard x rays. We reveal a number of hidden contributions, arising specifically from La 5p, Mn 4s, O 2s orbitals, considered negligible in previous analyses; our results demonstrate that all these contributions are significant for a correct description of the valence band of LSMO and of transition metal oxides in general

Ultrafast spectroscopy with spin polarization

A project for the design and r.alization of an experimental station dedicated to ultrafast spin polarization dynamics allowing for spin polarization measurements of photoelectron yield as excited by free electron laser pulses is presented

Livelli sierici di resistina in bambini con Rinite Allergica

La resistina è una proteina sierica prodotta dagli adipociti e dai macrofagi circolanti con dimostrata attività proinfiammatoria. Molti autori hanno descritto un aumento dei livelli di questa adipochina sierica negli atopici con malattie respiratorie come la rinite allergica (RA)

Studio pediatrico sui fenotipi della rinite allergica in Italia

La rinite allergica (RA) è una patologia causata da iperproduzione di IgE specifiche verso allergeni ambientali innocui e ubiquitari con infiammazione della mucosa nasale che può interessare organi contigui e distanti anche attraverso riflessi neuronali e processi infiammatori sistemici

Vernal keratoconjunctivitis treated with omalizumab: a case series

We report the cases of four children affected by Vernal keratoconjunctivitis (VKC) treated with Omalizumab with resolution of ocular signs and symptoms. Vernal keratoconjunctivitis (VKC) is a chronic conjunctivitis, not responding to topical antihistamines and frequently misdiagnosed and mistreated. The effect of Omalizumab in patients with VKC should be better investigated and well- designed studies are warranted to prove its efficacy. Not only might these studies be useful in order to provide new therapeutic strategies especially in patients resistant to cyclosporine and tacrolimus, but also they could help to clarify the pathogenesis of this severe ocular diseas

Un caso di sbagliata diagnosi di allergia alla penicillina

Vi presentiamo il caso clinico di una bambini di 8 anni con diagnosi di malattia reumatica. Nell'anamnesi familiare si segnalano madre e sorella con deficit del citocromo p450 con conseguente allergia ritardata a diverse classi di farmaci

Chemical, electronic, and magnetic structure of LaFeCoSi alloy: Surface and bulk properties

We investigate the chemical, electronic, and magnetic structure of the magnetocaloric LaFeCoSi compound with bulk and surface sensitive techniques. We put in evidence that the surface retains a soft ferromagnetic behavior at temperatures higher than the Curie temperature of the bulk due to the presence of Fe clusters at the surface only. This peculiar magnetic surface effect is attributed to the exchange interaction between the ferromagnetic Fe clusters located at the surface and the bulk magnetocaloric alloy, and it is used here to monitor the magnetic properties of the alloy itself

Chemical, electronic, and magnetic structure of LaFeCoSi alloy: Surface and bulk properties

We investigate the chemical, electronic, and magnetic structure of the magnetocaloric LaFeCoSi compound with bulk and surface sensitive techniques. We put in evidence that the surface retains a soft ferromagnetic behavior at temperatures higher than the Curie temperature of the bulk due to the presence of Fe clusters at the surface only. This peculiar magnetic surface effect is attributed to the exchange interaction between the ferromagnetic Fe clusters located at the surface and the bulk magnetocaloric alloy, and it is used here to monitor the magnetic properties of the alloy itself. (C) 2014 AIP Publishing LLC