Search results for "microscopi"
showing 10 items of 232 documents
Fabrication and characterization of thermo-plasmonic routers for telecom applications
2013
The Dielectric Loaded Surface Plasmon Polariton Waveguides (DLSPPWs) have recently emerged as a possible solution to carry both optical and electrical signals on- chip. However, in the particular context of optical interconnects, advanced functionalities such as filtering, switching, and routing are required in order to replace in the future the equivalent electronic components which are too much power consumer and also to reduce their footprints. After presenting the interest and limitation of the leakage radiation microscopy method used all along this work, we show several active devices using thermo-sensitive polymers as the dielectric load driven electrically by Joule heating. Then we d…
Resolution limit in opto-digital systems revisited
2023
The resolution limit achievable with an optical system is a fundamental piece of information when characterizing its performance, mainly in case of microscopy imaging. Usually this information is given in the form of a distance, often expressed in microns, or in the form of a cutoff spatial frequency, often expressed in line pairs per mm. In modern imaging systems, where the final image is collected by pixelated digital cameras, the resolution limit is determined by the performance of both, the optical systems and the digital sensor. Usually, one of these factors is considered to be prevalent over the other for estimating the spatial resolution, leading to the global performance of the imag…
Fast and robust wave optics-based reconstruction protocol for Fourier lightfield microscopy
2023
Fourier lightfield microscopy (FLMic) is a powerful technique to record 3D images of thick dynamic samples. Belonging FLMic to the general class of computational imaging techniques, its efficiency is determined by several factors, like the optical system, the calibration process, the reconstruction algorithm, or the computation architecture. In the case of FLMic the calibration and the reconstruction algorithm should be fully adapted to the singular features of the technique. To this end, and concerning the reconstruction, we discard the use of experimental PSFs, and propose the use of a synthetic one, which is calculated on the basis of paraxial optics and taking into account the equal inf…
GUARDARE PER LIVELLI: DAI SISTEMI AI COMPONENTI, DALLE PROPRIETÀ MACROSCOPICHE ALLE STRUTTURE MICROSCOPICHE
2008
Chemical Ligation and Isotope Labeling to Locate Dynamic Effects during Catalysis by Dihydrofolate Reductase.
2015
Abstract Chemical ligation has been used to alter motions in specific regions of dihydrofolate reductase from E. coli and to investigate the effects of localized motional changes on enzyme catalysis. Two isotopic hybrids were prepared; one with the mobile N‐terminal segment containing heavy isotopes (2H, 13C, 15N) and the remainder of the protein with natural isotopic abundance, and the other one with only the C‐terminal segment isotopically labeled. Kinetic investigations indicated that isotopic substitution of the N‐terminal segment affected only a physical step of catalysis, whereas the enzyme chemistry was affected by protein motions from the C‐terminal segment. QM/MM studies support th…
The Aspect of Anti-Proteinase 3 Antibodies as AECA
2001
Publisher Summary The discovery of anti-neutrophil cytoplasmic antibodies (ANCA) has caused a great impact on the diagnostic procedure and clinical observation of systemic necrotizing vasculitides like Wegener's granulomatosis (WG), microscopic polyangiitis, Churg- Strauss syndrome and necrotizing glomerulonephritis. There is persuasive circumstantial evidence for a pathogenic role of ANCA in ANCA-related vasculitides involving both neutrophils and vascular endothelial cells. The major stepthrough in the pathogenesis of ANCA related diseases was the identification of proteinase-3 (PR-3) as the main target antigen of ANCA in Wegener's Granulomatosis. PR-3 has been described as a constituent …
On the synonymization of Acaulon longifolium Herrnst. & Heyn with Acaulon fontiquerianum Casas & Sérgio (Pottiaceae)
2021
During bryological work conducted in the Sharon plane region (Israel), a colony of Acaulon Müll. Hal. was discovered. The plants showed morphological affinities both to A. longifolium Herrnst. & Heyn and A. fontiquerianum Casas & Sérgio depending on the floras used for their identification which challenged their recognition as separate species. In order to solve this taxonomic dilemma, we conducted a detailed morphological characterization of the two species based on representative samples. The micromorphological study of vegetative, sporophytic and spore traits revealed the large overlap of range values between both species. Both species showed the characteristic combination of morphologic…
Conceptual and epistemological difficulties of future teachers of physics and chemistry in the energetic explanations of physical and chemical phenom…
2016
En este trabajo analizamos las dificultades conceptuales y epistemológicas que tienen sobre termoquímica estudiantes universitarios de los últimos cursos de Física, Química e Ingeniería Química. Para ello se han aplicado a una muestra de 35 de estos futuros profesores dos cuestionarios sobre efectos térmicos en fenómenos físicos y químicos que han de explicar y se han categorizado sus respuestas según los razonamientos usados. Se ha constatado que la mayoría de los estudiantes no saben delimitar en el nivel macroscópico los sistemas que interaccionan, no utilizan el concepto de energía interna ni la primera ley de la termodinámica en los procesos físicos y químicos. Muy pocos de estos profe…
Transition probabilities in 31P and 31S : A test for isospin symmetry
2021
International audience; Excited states in the mirror nuclei 31P and 31S were populated in the 1p and 1n exit channels of the reaction 20Ne + 12C, at a beam energy of 33 MeV. The 20Ne beam was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident γ-rays and Doppler-shift attenuation lifetime measurements were performed using the multi-detector array GASP in conjunction with the EUCLIDES charged particle detector. In the observed B(E1) strengths, the isoscalar component, amounting to 24% of the isovector one, provides strong evidence for breaking of the isospin symmetry in the A=31 mass region. Self-consistent bey…
Editorial: The Future of Nuclear Structure: Challenges and Opportunities in the Microscopic Description of Nuclei
2021
The past two decades have witnessed tremendous progress in the microscopic description of atomic nuclei. The Topical Review `The Future of Nuclear Structure' aims at summarizing the current state-of-the-art microscopic calculations in Nuclear Theory and to give a useful reference for young researches who wish to learn more about this exciting discipline.