12 research outputs found
Fine structure of "zero-mode" Landau levels in HgTe/HgCdTe quantum wells
HgTe/HgCdTe quantum wells with the inverted band structure have been probed
using far infrared magneto-spectroscopy. Realistic calculations of Landau level
diagrams have been performed to identify the observed transitions.
Investigations have been greatly focused on the magnetic field dependence of
the peculiar pair of "zero-mode" Landau levels which characteristically split
from the upper conduction and bottom valence bands, and merge under the applied
magnetic field. The observed avoided crossing of these levels is tentatively
attributed to the bulk inversion asymmetry of zinc blend compounds.Comment: 5 pages, 4 figure
Post-Translational Modifications and Lipid Binding Profile of Insect Cell-Expressed Full-Length Mammalian Synaptotagmin 1
ABSTRACT: Synaptotagmin 1 (Syt1) is a Ca2+ sensor for SNARE-mediated, Ca2+-triggered synaptic vesicle fusion in neurons. It is composed of luminal, transmembrane, linker, and two Ca2+-binding (C2) domains. Here we describe expression and purification of full-length mammalian Syt1 in insect cells along with an extensive biochemical characterization of the purified protein. The expressed and purified protein is properly folded and has increased α-helical content compared to the C2AB fragment alone. Post-translational modifications of Syt1 were analyzed by mass spectrometry, revealing the same modifications of Syt1 that were previously described for Syt1 purified from brain extract or mammalian cell lines, along with a novel modification of Syt1, tyrosine nitration. A lipid binding screen with both full-length Syt1 and the C2AB fragments of Syt1 and Syt3 isoforms revealed new Syt1âlipid interactions. These results suggest a conserved lipid binding mechanism in which Ca2+-independent interactions are mediated via a lysine rich region of the C2B domain while Ca2+-dependent interactions are mediated via the Ca2+-binding loops
PrevalĂȘncia de oclusopatia na dentição decĂdua e permanente de crianças na cidade de SĂŁo Paulo, Brasil, 1996
Built-In Electric Field in High Quality GaN/AlGaN Quantum Wells
We report studies on electric field built in GaN/AlGaN structure of nominally 6 nm wide quantum well. The sample was grown in horizontal metal-organic chemical vapor deposition reactor using innovative technology that decreases the density of screw dislocations. Firstly, using visible and mid infra-red interference pattern along the sample, the layer thickness and consequently the quantum well width was determined to vary linearly with the position. Secondly, photoluminescence spectra was taken at different positions. Correlation of those two measurements allows us to determine the built-in electric field to be 0.66 MV/cm, which is considerably larger than previously reported for similar structures
Built-In Electric Field in High Quality GaN/AlGaN Quantum Wells
We report studies on electric field built in GaN/AlGaN structure of nominally 6 nm wide quantum well. The sample was grown in horizontal metal-organic chemical vapor deposition reactor using innovative technology that decreases the density of screw dislocations. Firstly, using visible and mid infra-red interference pattern along the sample, the layer thickness and consequently the quantum well width was determined to vary linearly with the position. Secondly, photoluminescence spectra was taken at different positions. Correlation of those two measurements allows us to determine the built-in electric field to be 0.66 MV/cm, which is considerably larger than previously reported for similar structures
Musculo-articular disorders of the stomatoganthic system in school children examined according to clinical criteria
Bone Marrow-Derived Cells Mobilized by Granulocyte-Colony Stimulating Factor Facilitate Vascular Regeneration in Mouse Kidney after Ischemia/Reperfusion Injury
Effect of a combined treatment with erythropoietin and melatonin on renal ischemia reperfusion injury in male rats
Combining RAIT and immune-based therapies to overcome resistance in cancer? Combining RAIT and immune-based therapies to overcome resistance in cancer?
International audienceRadiation therapy has long been considered as immunosuppressive; therefore its impact on the immune system and other aspects which could be involved in raising efficient antitumor immune responses has been neglected. However, the recent demonstration of the immunogenic properties of ionizing radiation is rapidly modifying the radiation oncology field, and it also opens new and promising perspectives for the development and improvement of radioimmunotherapy. In this chapter, we first review the immunogenic properties of irradiation before discussing available evidence of the benefits of radiation therapy and immunotherapy combinations in the context of lymphoma