1
|
Curcio A, Mou S, Palumbo L, Lupi S, Petrarca M. Selection rules for the orbital angular momentum of optically produced THz radiation. Opt Lett 2021; 46:1514-1517. [PMID: 33793468 DOI: 10.1364/ol.416814] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 02/22/2021] [Indexed: 06/12/2023]
Abstract
In this work, we theoretically study the transduction of orbital angular momentum (OAM) l for infrared pump lasers into the THz domain. In the case of optical rectification, the transduction of OAM occurs only through a spin-orbit interaction, with the selection rule on the OAM l=0 valid for any kind of polarization of the pump, which means that there is no transfer of OAM along the propagation axis. In difference frequency generation, the selection rule for the difference Δl between the OAM of the pump fields with linear or circular polarization is l=Δl, whereas l ranges from Δl-2 to Δl+2 in cases of both radial and azimuthal polarization. Moreover, for THz generation in the latter case, the high diffraction obtained with tightly focused pumps yields l tending to Δl±2, while l tends to zero in the opposite case of large pump beams.
Collapse
|
2
|
Rezvani SJ, Di Gioacchino D, Tofani S, D'Arco A, Ligi C, Lupi S, Gatti C, Cestelli Guidi M, Marcelli A. A cryogenic magneto-optical device for long wavelength radiation. Rev Sci Instrum 2020; 91:075103. [PMID: 32752830 DOI: 10.1063/5.0011348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 06/05/2020] [Indexed: 06/11/2023]
Abstract
We present here a small-scale liquid helium immersion cryostat with an innovative optical setup suitable to work in long wavelength radiation ranges and under an applied magnetic field. The cryostat is a multi-stage device with several shielding in addition to several optical stages. The system has been designed with an external liquid nitrogen boiler to reduce liquid bubbling. The optical and mechanical properties of the optical elements were calculated and optimized for the designed configuration, while the optical layout has been simulated and optimized among different configurations based on the geometry of the device. The final design has been optimized for low-noise radiation measurements of proximity junction arrays under an applied magnetic field in the wavelength range λ = 250 μm-2500 μm.
Collapse
Affiliation(s)
- S J Rezvani
- INFN - Laboratori Nazionali di Frascati, Via Enrico 54, 00044 Frascati (RM), Italy
| | - D Di Gioacchino
- INFN - Laboratori Nazionali di Frascati, Via Enrico 54, 00044 Frascati (RM), Italy
| | - S Tofani
- Department of Information Engineering, Electronics and Telecommunications, "Sapienza" University of Rome, 00184 Rome, Italy
| | - A D'Arco
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - C Ligi
- INFN - Laboratori Nazionali di Frascati, Via Enrico 54, 00044 Frascati (RM), Italy
| | - S Lupi
- INFN - Laboratori Nazionali di Frascati, Via Enrico 54, 00044 Frascati (RM), Italy
| | - C Gatti
- INFN - Laboratori Nazionali di Frascati, Via Enrico 54, 00044 Frascati (RM), Italy
| | - M Cestelli Guidi
- INFN - Laboratori Nazionali di Frascati, Via Enrico 54, 00044 Frascati (RM), Italy
| | - A Marcelli
- INFN - Laboratori Nazionali di Frascati, Via Enrico 54, 00044 Frascati (RM), Italy
| |
Collapse
|
3
|
Di Pietro P, Adhlakha N, Piccirilli F, Di Gaspare A, Moon J, Oh S, Di Mitri S, Spampinati S, Perucchi A, Lupi S. Terahertz Tuning of Dirac Plasmons in Bi_{2}Se_{3} Topological Insulator. Phys Rev Lett 2020; 124:226403. [PMID: 32567905 DOI: 10.1103/physrevlett.124.226403] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 05/15/2020] [Indexed: 06/11/2023]
Abstract
Light can be strongly confined in subwavelength spatial regions through the interaction with plasmons, the collective electronic modes appearing in metals and semiconductors. This confinement, which is particularly important in the terahertz spectral region, amplifies light-matter interaction and provides a powerful mechanism for efficiently generating nonlinear optical phenomena. These effects are particularly relevant in graphene and topological insulators, where massless Dirac fermions show a naturally nonlinear optical behavior in the terahertz range. The strong interaction scenario has been considered so far from the point of view of light. In this Letter, we investigate instead the effect of strong interaction on the plasmon itself. In particular, we will show that Dirac plasmons in Bi_{2}Se_{3} topological insulator are strongly renormalized when excited by high-intensity terahertz radiation by displaying a huge red-shift down to 60% of its characteristic frequency. This opens the road towards tunable terahertz nonlinear optical devices based on topological insulators.
Collapse
Affiliation(s)
- P Di Pietro
- Elettra - Sincrotrone Trieste S.C.p.A., S.S. 14 km - 163,5 in Area Science Park, I-34149 Basovizza, Trieste, Italy
| | - N Adhlakha
- Elettra - Sincrotrone Trieste S.C.p.A., S.S. 14 km - 163,5 in Area Science Park, I-34149 Basovizza, Trieste, Italy
| | - F Piccirilli
- CNR-IOM, Area Science Park, I-34012 Trieste, Italy
| | - A Di Gaspare
- NEST, CNRNANO and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
| | - J Moon
- Department of Physics and Astronomy Rutgers, The State University of New Jersey, 136 Frelinghuysen Road Piscataway, New Jersey 08854-8019 USA
| | - S Oh
- Department of Physics and Astronomy Rutgers, The State University of New Jersey, 136 Frelinghuysen Road Piscataway, New Jersey 08854-8019 USA
| | - S Di Mitri
- Elettra - Sincrotrone Trieste S.C.p.A., S.S. 14 km - 163,5 in Area Science Park, I-34149 Basovizza, Trieste, Italy
| | - S Spampinati
- Elettra - Sincrotrone Trieste S.C.p.A., S.S. 14 km - 163,5 in Area Science Park, I-34149 Basovizza, Trieste, Italy
| | - A Perucchi
- Elettra - Sincrotrone Trieste S.C.p.A., S.S. 14 km - 163,5 in Area Science Park, I-34149 Basovizza, Trieste, Italy
| | - S Lupi
- CNR-IOM and Dipartimento di Fisica, Sapienza Università di Roma, P.le Aldo Moro 2, I-00185 Roma, Italy
| |
Collapse
|
4
|
Gómez R, Hernaiz M, de Miguel V, Aparicio L, Marín M, Lupi S, Barontini M. Enfoque diagnóstico de feocromocitomas y paragangliomas. Hipertensión y Riesgo Vascular 2019; 36:34-43. [DOI: 10.1016/j.hipert.2018.06.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 06/30/2018] [Indexed: 02/09/2023]
|
5
|
Curcio A, Dolci V, Lupi S, Petrarca M. Terahertz-based retrieval of the spectral phase and amplitude of ultrashort laser pulses. Opt Lett 2018; 43:783-786. [PMID: 29443993 DOI: 10.1364/ol.43.000783] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 01/11/2018] [Indexed: 06/08/2023]
Abstract
Terahertz (THz) radiation is of great interest for a variety of applications, e.g., particle accelerations, spectroscopy investigations of quantum systems, and high-field study of materials. One of the most common laser-based processes to produce THz pulses is optical rectification, which transduces an infrared pump laser to the THz domain (0.1-20 THz). In this work, we propose and theoretically describe a method to characterize the amplitude and phase of the electric field of the pump laser pulse relying on THz generation and detection. We demonstrate with a numerical example how THz radiation can be used as diagnostics to characterize laser pulses with temporal length at the femtosecond level.
Collapse
|
6
|
Abstract
In this paper, an alternative perspective for the generation of millimetric high-gradient resonant plasma waves is discussed. This method is based on the plasma-wave excitation by energetic single-cycle THz pulses whose temporal length is comparable to the plasma wavelength. The excitation regime discussed in this paper is the quasi-nonlinear regime that can be achieved when the normalized vector potential of the driving THz pulse is on the order of unity. To investigate this regime and determine the strength of the excited electric fields, a Particle-In-Cell (PIC) code has been used. It has been found that by exploiting THz pulses with characteristics currently available in laboratory, longitudinal electron plasma waves with electric gradients up to hundreds MV/m can be obtained. The mm-size nature of the resonant plasma wave can be of great utility for an acceleration scheme in which high-brightness electron bunches are injected into the wave to undergo a strong acceleration. The long-size nature of the acceleration bucket with respect to the short length of the electron bunches can be handled in a more robust manner in comparison with the case when micrometric waves are employed.
Collapse
Affiliation(s)
- A Curcio
- Department of Basic and Applied Sciences for Engineering (SBAI), "Sapienza" University of Rome, Via A. Scarpa 14, 00161, Rome, Italy.,INFN-LNF, via Enrico Fermi 40, 00044, Frascati, Italy
| | - A Marocchino
- Department of Basic and Applied Sciences for Engineering (SBAI), "Sapienza" University of Rome, Via A. Scarpa 14, 00161, Rome, Italy.,INFN-LNF, via Enrico Fermi 40, 00044, Frascati, Italy
| | - V Dolci
- Department of Basic and Applied Sciences for Engineering (SBAI), "Sapienza" University of Rome, Via A. Scarpa 14, 00161, Rome, Italy.,Roma1-INFN, P.le Aldo Moro, 2, 00185, Rome, Italy
| | - S Lupi
- Roma1-INFN, P.le Aldo Moro, 2, 00185, Rome, Italy.,Department of Physics, "Sapienza" University of Rome, Piazzale A. Moro 2, I-00185, Rome, Italy
| | - M Petrarca
- Department of Basic and Applied Sciences for Engineering (SBAI), "Sapienza" University of Rome, Via A. Scarpa 14, 00161, Rome, Italy. .,Roma1-INFN, P.le Aldo Moro, 2, 00185, Rome, Italy.
| |
Collapse
|
7
|
Lo Vecchio I, Baldassarre L, Di Pietro P, Giorgianni F, Marsi M, Perucchi A, Schade U, Lanzara A, Lupi S. Orbital dependent coherence temperature and optical anisotropy of V 2O 3 quasiparticles. J Phys Condens Matter 2017; 29:345602. [PMID: 28665290 DOI: 10.1088/1361-648x/aa7cd7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on an orbital and temperature dependent study of the onset of coherent quasiparticles in V2O3 single crystal. By using polarized infrared spectroscopy we demonstrate that the electronic coherence temperature is strongly orbital dependent, being about 400 K for [Formula: see text] orbitals and 500 K for the [Formula: see text]. This suggests that V2O3 low energy electrodynamics can be described in terms of two electron liquids differently renormalized by electronic correlations.
Collapse
Affiliation(s)
- I Lo Vecchio
- Dipartimento di Fisica, 'Sapienza' Università di Roma, Piazzale A. Moro 2, I-00185 Roma, Italy. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
| | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Peli S, Dal Conte S, Comin R, Nembrini N, Ronchi A, Abrami P, Banfi F, Ferrini G, Brida D, Lupi S, Fabrizio M, Damascelli A, Capone M, Cerullo G, Giannetti C. Mottness at finite doping and charge-instabilities in cuprates. Nat Phys 2017; 13:806-811. [PMID: 28781605 PMCID: PMC5540185 DOI: 10.1038/nphys4112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 03/27/2017] [Indexed: 05/31/2023]
Abstract
The influence of the Mott physics on the doping-temperature phase diagram of copper oxides represents a major issue that is subject of intense theoretical and experimental effort. Here, we investigate the ultrafast electron dynamics in prototypical single-layer Bi-based cuprates at the energy scale of the O-2p→Cu-3d charge-transfer (CT) process. We demonstrate a clear evolution of the CT excitations from incoherent and localized, as in a Mott insulator, to coherent and delocalized, as in a conventional metal. This reorganization of the high-energy degrees of freedom occurs at the critical doping pcr ≈0.16 irrespective of the temperature, and it can be well described by dynamical mean field theory calculations. We argue that the onset of the low-temperature charge instabilities is the low-energy manifestation of the underlying Mottness that characterizes the p < pcr region of the phase diagram. This discovery sets a new framework for theories of charge order and low-temperature phases in underdoped copper oxides.
Collapse
Affiliation(s)
- S Peli
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- Department of Physics, Università degli Studi di Milano, 20133 Milano, Italy
| | - S Dal Conte
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy
| | - R Comin
- Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - N Nembrini
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- Department of Physics, Università degli Studi di Milano, 20133 Milano, Italy
| | - A Ronchi
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee, Leuven, Belgium
| | - P Abrami
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
| | - F Banfi
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
| | - G Ferrini
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
| | - D Brida
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy
- Department of Physics and Center for Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
| | - S Lupi
- CNR-IOM Dipartimento di Fisica, Università di Roma La Sapienza P.le Aldo Moro 2, 00185 Rome, Italy
| | - M Fabrizio
- Scuola Internazionale Superiore di Studi Avanzati (SISSA) and CNR-IOM Democritos National Simulation Center, Via Bonomea 265, 34136 Trieste (Italy)
| | - A Damascelli
- Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - M Capone
- Scuola Internazionale Superiore di Studi Avanzati (SISSA) and CNR-IOM Democritos National Simulation Center, Via Bonomea 265, 34136 Trieste (Italy)
| | - G Cerullo
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy
| | - C Giannetti
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
| |
Collapse
|
9
|
Brosio F, Kuhdari P, Stefanati A, Sulcaj N, Lupi S, Guidi E, Bergamini M, Gabutti G. Knowledge and behaviour of nursing students on the prevention of healthcare associated infections. J Prev Med Hyg 2017; 58:E99-E104. [PMID: 28900349 PMCID: PMC5584094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
INTRODUCTION Hospital infections, or "healthcare associated infections" (HAI) represent the most common and serious complications of healthcare. Adoption of safe care practices able to prevent or control the transmission of infections, both in hospitals and in other healthcare settings is crucial. The aim of the study is to assess the awareness about the risk factors and the most effective measures of prevention of HAI in the University of Ferrara nursing school students, giving particular attention to the hand hygiene practices and the use of standard precautions. METHODS 339 students attending all the three years of course of the same academic year were enrolled. An anonymous questionnaire was administered in order to investigate the knowledge about three specific areas: infections associated with healthcare practices (HAI), standard precautions (SP) and hand hygiene (HH). RESULTS A sufficient level of knowledge by all the three groups of students was observed only in the SP area. A barely sufficient score was reached only by the third year students with regard to the proper HH. The level of knowledge about HAI was inadequate. CONCLUSIONS A periodically check of nursing students' knowledge would be advisable in order to fill any gaps, improve training, reduce HAI and increase prevention measures compliance.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | - G. Gabutti
- Correspondence: Giovanni Gabutti, Section of Public Health Medicine, Department of Medical Sciences, University of Ferrara, via Fossato di Mortara 64/b, 44121 Ferrara, Italy - Tel. +39 0532 455568 - Fax +39 0532 205066 - E-mail:
| |
Collapse
|
10
|
Autore M, Di Pietro P, Di Gaspare A, D'Apuzzo F, Giorgianni F, Brahlek M, Koirala N, Oh S, Lupi S. Terahertz plasmonic excitations in Bi 2Se 3 topological insulator. J Phys Condens Matter 2017; 29:183002. [PMID: 28362633 DOI: 10.1088/1361-648x/aa63ac] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
After the discovery of Dirac electrons in condensed matter physics, more specifically in graphene and its derivatives, their potentialities in the fields of plasmonics and photonics have been readily recognized, leading to a plethora of applications in active and tunable optical devices. Massless Dirac carriers have been further found in three-dimensional topological insulators. These exotic quantum systems have an insulating gap in the bulk and intrinsic Dirac metallic states at any surface, sustaining not only single-particle excitations but also plasmonic collective modes. In this paper we will review the plasmon excitations in different microstructures patterned on Bi2Se3 topological insulator thin films as measured by terahertz spectroscopy. We discuss the dependence of the plasmon absorption versus the microstructure shape, wavevector, and magnetic field. Finally we will discuss the topological protection of both the Dirac single-particle and plasmon excitations.
Collapse
Affiliation(s)
- M Autore
- INFN and Dipartimento di Fisica, Università di Roma 'La Sapienza', Piazzale A. Moro 2, I-00185 Roma, Italy. CIC nanoGUNE Tolosa Hiribidea, 76 E-20018 Donostia San Sebastian, Spain
| | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Guardabassi DS, Lupi S, Agejas R, Allub JM, García-Fornari G. Efficacy of ultrasound-guided transversus abdominis plane block in laparoscopic hysterectomy. Clinical trial. Rev Esp Anestesiol Reanim 2017; 64:257-261. [PMID: 28162785 DOI: 10.1016/j.redar.2016.12.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 12/05/2016] [Accepted: 12/13/2016] [Indexed: 06/06/2023]
Abstract
OBJECTIVES Transversus abdominis plane block is a regional anaesthesia technique that has proven to be effective for postoperative pain reduction in different abdominal surgical procedures. This study evaluated its efficacy on post laparoscopic hysterectomy pain intensity and analgesic consumption. MATERIALS AND METHODS Randomized controlled trial which included 40 patients scheduled for laparoscopic hysterectomy, enrolled in 2 groups: transversus abdominis plane block+systemic analgesia (Group 1; n=20), versus systemic analgesia (Group 2; n=20). Opioid consumption within the first 24 postoperative hours, pain intensity scores at 60min, 2, 8 and 24h after surgery, adverse events related to systemic analgesia and time to hospital discharge were evaluated and registered. RESULTS We found no differences between both groups in opioid consumption (10mg vs. 7mg; P=.2) and pain scores (NVS) within the first 24 postoperative hours, at 60min (3 vs. 5; P=.65), 120min (0 vs. 2; P=.15), 8 and 24h (0 vs. 0; P>.50) for the last 2 points in time analysed. Adverse events related to medication and time to hospital discharge showed similar results. CONCLUSIONS Adding a transversus abdominis plane block technique to opioid PCA does not seem to improve postoperative pain management in laparoscopic hysterectomy. Patient preparation time and costs could be incremented and complications (although rare) related to the technique could appear.
Collapse
Affiliation(s)
- D S Guardabassi
- Servicio de Anestesiología, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina.
| | - S Lupi
- Servicio de Anestesiología, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - R Agejas
- Servicio de Anestesiología, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - J M Allub
- Servicio de Anestesiología, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| | - G García-Fornari
- Servicio de Anestesiología, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
| |
Collapse
|
12
|
Lo Vecchio I, Denlinger JD, Krupin O, Kim BJ, Metcalf PA, Lupi S, Allen JW, Lanzara A. Fermi Surface of Metallic V_{2}O_{3} from Angle-Resolved Photoemission: Mid-level Filling of e_{g}^{π} Bands. Phys Rev Lett 2016; 117:166401. [PMID: 27792364 DOI: 10.1103/physrevlett.117.166401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Indexed: 06/06/2023]
Abstract
Using angle resolved photoemission spectroscopy, we report the first band dispersions and distinct features of the bulk Fermi surface (FS) in the paramagnetic metallic phase of the prototypical metal-insulator transition material V_{2}O_{3}. Along the c axis we observe both an electron pocket and a triangular holelike FS topology, showing that both V 3d a_{1g} and e_{g}^{π} states contribute to the FS. These results challenge the existing correlation-enhanced crystal field splitting theoretical explanation for the transition mechanism and pave the way for the solution of this mystery.
Collapse
Affiliation(s)
- I Lo Vecchio
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J D Denlinger
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - O Krupin
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - B J Kim
- Max-Planck-Institut fur Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
| | - P A Metcalf
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
| | - S Lupi
- CNR-IOM and Dipartimento di Fisica, Università di Roma "Sapienza", I-00185 Rome, Italy
| | - J W Allen
- Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - A Lanzara
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Physics, University of California Berkeley, Berkeley, California 94720, USA
| |
Collapse
|
13
|
Lantz G, Hajlaoui M, Papalazarou E, Jacques VLR, Mazzotti A, Marsi M, Lupi S, Amati M, Gregoratti L, Si L, Zhong Z, Held K. Surface Effects on the Mott-Hubbard Transition in Archetypal V{2}O{3}. Phys Rev Lett 2015; 115:236802. [PMID: 26684133 DOI: 10.1103/physrevlett.115.236802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Indexed: 06/05/2023]
Abstract
We present an experimental and theoretical study exploring surface effects on the evolution of the metal-insulator transition in the model Mott-Hubbard compound Cr-doped V{2}O{3}. We find a microscopic domain formation that is clearly affected by the surface crystallographic orientation. Using scanning photoelectron microscopy and x-ray diffraction, we find that surface defects act as nucleation centers for the formation of domains at the temperature-induced isostructural transition and favor the formation of microscopic metallic regions. A density-functional theory plus dynamical mean-field theory study of different surface terminations shows that the surface reconstruction with excess vanadyl cations leads to doped, and hence more metallic, surface states, which explains our experimental observations.
Collapse
Affiliation(s)
- G Lantz
- Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France
| | - M Hajlaoui
- Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France
| | - E Papalazarou
- Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France
| | - V L R Jacques
- Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France
| | - A Mazzotti
- Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France
| | - M Marsi
- Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France
| | - S Lupi
- Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro, I-00185 Roma, Italy
| | - M Amati
- Elettra-Sincrotrone Trieste SCpA, SS 14 km 163.5 AREA Science Park, 34149 Basovizza, Trieste, Italy
| | - L Gregoratti
- Elettra-Sincrotrone Trieste SCpA, SS 14 km 163.5 AREA Science Park, 34149 Basovizza, Trieste, Italy
| | - L Si
- Institute for Solid State Physics, Vienna University of Technology, AT-1040 Vienna, Austria
| | - Z Zhong
- Institute for Solid State Physics, Vienna University of Technology, AT-1040 Vienna, Austria
- Institute for Theoretical and Astrophysics, University of Würzburg, Am Hubland, 9704 Würzburg, Germany
| | - K Held
- Institute for Solid State Physics, Vienna University of Technology, AT-1040 Vienna, Austria
| |
Collapse
|
14
|
Campetella M, Bodo E, Caminiti R, Martino A, D’Apuzzo F, Lupi S, Gontrani L. Interaction and dynamics of ionic liquids based on choline and amino acid anions. J Chem Phys 2015; 142:234502. [DOI: 10.1063/1.4922442] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Affiliation(s)
- M. Campetella
- Department of Chemistry, University of Rome “La Sapienza,” Rome, Italy
| | - E. Bodo
- Department of Chemistry, University of Rome “La Sapienza,” Rome, Italy
| | - R. Caminiti
- Department of Chemistry, University of Rome “La Sapienza,” Rome, Italy
| | - A. Martino
- Department of Chemistry, University of Rome “La Sapienza,” Rome, Italy
| | - F. D’Apuzzo
- Department of Physics, University of Rome “La Sapienza,” Rome, Italy
| | - S. Lupi
- Department of Physics, University of Rome “La Sapienza,” Rome, Italy
| | - L. Gontrani
- Department of Chemistry, University of Rome “La Sapienza,” Rome, Italy
| |
Collapse
|
15
|
Di Pietro P, Hoffman J, Bhattacharya A, Lupi S, Perucchi A. Spectral Weight Redistribution in (LaNiO3)n/(LaMnO3)2 Superlattices from Optical Spectroscopy. Phys Rev Lett 2015; 114:156801. [PMID: 25933327 DOI: 10.1103/physrevlett.114.156801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Indexed: 06/04/2023]
Abstract
We have studied the optical properties of four (LaNiO3)n/(LaMnO3)2 superlattices (SL) (n=2,3,4,5) on SrTiO3 substrates. We have measured the reflectivity at temperatures from 20 to 400 K, and extracted the optical conductivity through a fitting procedure based on a Kramers-Kronig consistent Lorentz-Drude model. With increasing LaNiO3 thickness, the SLs undergo an insulator-to-metal transition (IMT) that is accompanied by the transfer of spectral weight from high to low frequency. The presence of a broad midinfrared band, however, shows that the optical conductivity of the (LaNiO3)n/(LaMnO3)2 SLs is not a linear combination of the LaMnO_{3} and LaNiO3 conductivities. Our observations suggest that interfacial charge transfer leads to an IMT due to a change in valence at the Mn and Ni sites.
Collapse
Affiliation(s)
- P Di Pietro
- INSTM Udr Trieste-ST and Elettra-Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Trieste, Italy
| | - J Hoffman
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - A Bhattacharya
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - S Lupi
- CNR-IOM and Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 2, I-00185 Roma, Italy
| | - A Perucchi
- INSTM Udr Trieste-ST and Elettra-Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Trieste, Italy
| |
Collapse
|
16
|
Kaiser S, Clark SR, Nicoletti D, Cotugno G, Tobey RI, Dean N, Lupi S, Okamoto H, Hasegawa T, Jaksch D, Cavalleri A. Optical properties of a vibrationally modulated solid state Mott insulator. Sci Rep 2014; 4:3823. [PMID: 24448171 PMCID: PMC3898202 DOI: 10.1038/srep03823] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 01/03/2014] [Indexed: 11/25/2022] Open
Abstract
Optical pulses at THz and mid-infrared frequencies tuned to specific vibrational resonances modulate the lattice along chosen normal mode coordinates. In this way, solids can be switched between competing electronic phases and new states are created. Here, we use vibrational modulation to make electronic interactions (Hubbard-U) in Mott-insulator time dependent. Mid-infrared optical pulses excite localized molecular vibrations in ET-F2TCNQ, a prototypical one-dimensional Mott-insulator. A broadband ultrafast probe interrogates the resulting optical spectrum between THz and visible frequencies. A red-shifted charge-transfer resonance is observed, consistent with a time-averaged reduction of the electronic correlation strength U. Secondly, a sideband manifold inside of the Mott-gap appears, resulting from a periodically modulated U. The response is compared to computations based on a quantum-modulated dynamic Hubbard model. Heuristic fitting suggests asymmetric holon-doublon coupling to the molecules and that electron double-occupancies strongly squeeze the vibrational mode.
Collapse
Affiliation(s)
- S. Kaiser
- Max-Planck-Institute for the Structure and Dynamics of Matter, Hamburg, Germany
- These authors contributed equally to this work
| | - S. R. Clark
- Centre for Quantum Technologies, National University of Singapore, Singapore
- Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford, UK
- These authors contributed equally to this work
| | - D. Nicoletti
- Max-Planck-Institute for the Structure and Dynamics of Matter, Hamburg, Germany
- These authors contributed equally to this work
| | - G. Cotugno
- Max-Planck-Institute for the Structure and Dynamics of Matter, Hamburg, Germany
- Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford, UK
| | - R. I. Tobey
- Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford, UK
| | - N. Dean
- Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford, UK
| | - S. Lupi
- CNR-IOM and Department of Physics, University of Rome “La Sapienza”, Rome, Italy
| | - H. Okamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - T. Hasegawa
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
| | - D. Jaksch
- Centre for Quantum Technologies, National University of Singapore, Singapore
- Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford, UK
| | - A. Cavalleri
- Max-Planck-Institute for the Structure and Dynamics of Matter, Hamburg, Germany
- Department of Physics, Oxford University, Clarendon Laboratory, Parks Road, Oxford, UK
| |
Collapse
|
17
|
Vecchio IL, Perucchi A, Di Pietro P, Limaj O, Schade U, Sun Y, Arai M, Yamaura K, Lupi S. Infrared evidence of a Slater metal-insulator transition in NaOsO₃. Sci Rep 2013; 3:2990. [PMID: 24141899 PMCID: PMC3801134 DOI: 10.1038/srep02990] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 09/20/2013] [Indexed: 11/09/2022] Open
Abstract
The magnetically driven metal-insulator transition (MIT) was predicted by Slater in the fifties. Here a long-range antiferromagnetic (AF) order can open up a gap at the Brillouin electronic band boundary regardless of the Coulomb repulsion magnitude. However, while many low-dimensional organic conductors display evidence for an AF driven MIT, in three-dimensional (3D) systems the Slater MIT still remains elusive. We employ terahertz and infrared spectroscopy to investigate the MIT in the NaOsO₃ 3D antiferromagnet. From the optical conductivity analysis we find evidence for a continuous opening of the energy gap, whose temperature dependence can be well described in terms of a second order phase transition. The comparison between the experimental Drude spectral weight and the one calculated through Local Density Approximation (LDA) shows that electronic correlations play a limited role in the MIT. All the experimental evidence demonstrates that NaOsO₃ is the first known 3D Slater insulator.
Collapse
Affiliation(s)
- I Lo Vecchio
- Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale A. Moro 2, I-00185 Roma, Italy
| | | | | | | | | | | | | | | | | |
Collapse
|
18
|
La Torre G, De Vito E, Ficarra M, Firenze A, Gregorio P, Boccia A, Miccoli S, Giraldi G, Saulle R, Semyonov L, Unim B, Ferrara M, Langiano E, De Belvis G, Capizzi S, Nardella R, Marsala M, Bonanno V, Ferrara C, Guidi E, Bergamini M, Lupi S. Is there a lack of information on HPV vaccination given by health professionals to young women? Vaccine 2013; 31:4710-3. [DOI: 10.1016/j.vaccine.2013.08.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 07/23/2013] [Accepted: 08/06/2013] [Indexed: 10/26/2022]
|
19
|
Di Pietro P, Ortolani M, Limaj O, Di Gaspare A, Giliberti V, Giorgianni F, Brahlek M, Bansal N, Koirala N, Oh S, Calvani P, Lupi S. Observation of Dirac plasmons in a topological insulator. Nat Nanotechnol 2013; 8:556-60. [PMID: 23872838 DOI: 10.1038/nnano.2013.134] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Accepted: 06/12/2013] [Indexed: 05/26/2023]
Abstract
Plasmons are quantized collective oscillations of electrons and have been observed in metals and doped semiconductors. The plasmons of ordinary, massive electrons have been the basic ingredients of research in plasmonics and in optical metamaterials for a long time. However, plasmons of massless Dirac electrons have only recently been observed in graphene, a purely two-dimensional electron system. Their properties are promising for novel tunable plasmonic metamaterials in the terahertz and mid-infrared frequency range. Dirac fermions also occur in the two-dimensional electron gas that forms at the surface of topological insulators as a result of the strong spin-orbit interaction existing in the insulating bulk phase. One may therefore look for their collective excitations using infrared spectroscopy. Here we report the first experimental evidence of plasmonic excitations in a topological insulator (Bi2Se3). The material was prepared in thin micro-ribbon arrays of different widths W and periods 2W to select suitable values of the plasmon wavevector k. The linewidth of the plasmon was found to remain nearly constant at temperatures between 6 K and 300 K, as expected when exciting topological carriers. Moreover, by changing W and measuring the plasmon frequency in the terahertz range versus k we show, without using any fitting parameter, that the dispersion curve agrees quantitatively with that predicted for Dirac plasmons.
Collapse
Affiliation(s)
- P Di Pietro
- CNR-SPIN, Corso F. Perrone, 16152 Genoa, Italy
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Perucchi A, Di Mitri S, Penco G, Allaria E, Lupi S. The TeraFERMI terahertz source at the seeded FERMI free-electron-laser facility. Rev Sci Instrum 2013; 84:022702. [PMID: 23464184 DOI: 10.1063/1.4790428] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We describe the project for the construction of a terahertz (THz) beamline to be called TeraFERMI at the seeded FERMI free electron laser (FEL) facility in Trieste, Italy. We discuss topics as the underlying scientific case, the choice of the source, the expected performance, and THz beam propagation. Through electron beam dynamics simulations we show that the installation of the THz source in the beam dump section provides a new approach for compressing the electron bunch length without affecting FEL operation. Thanks to this further compression of the FEL electron bunch, the TeraFERMI facility is expected to provide THz pulses with energies up to the mJ range during normal FEL operation.
Collapse
Affiliation(s)
- A Perucchi
- Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Basovizza, Trieste, Italy.
| | | | | | | | | |
Collapse
|
21
|
Chiadroni E, Bellaveglia M, Calvani P, Castellano M, Catani L, Cianchi A, Di Pirro G, Ferrario M, Gatti G, Limaj O, Lupi S, Marchetti B, Mostacci A, Pace E, Palumbo L, Ronsivalle C, Pompili R, Vaccarezza C. Characterization of the THz radiation source at the Frascati linear accelerator. Rev Sci Instrum 2013; 84:022703. [PMID: 23464185 DOI: 10.1063/1.4790429] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The linac driven coherent THz radiation source at the SPARC-LAB test facility is able to deliver broadband THz pulses with femtosecond shaping. In addition, high peak power, narrow spectral bandwidth THz radiation can be also generated, taking advantage of advanced electron beam manipulation techniques, able to generate an adjustable train of electron bunches with a sub-picosecond length and with sub-picosecond spacing. The paper reports on the manipulation, characterization, and transport of the electron beam in the bending line transporting the beam down to the THz station, where different coherent transition radiation spectra have been measured and studied with the aim to optimize the THz radiation performances.
Collapse
|
22
|
Ta Phuoc V, Vaju C, Corraze B, Sopracase R, Perucchi A, Marini C, Postorino P, Chligui M, Lupi S, Janod E, Cario L. Optical conductivity measurements of GaTa4Se8 under high pressure: evidence of a bandwidth-controlled insulator-to-metal Mott transition. Phys Rev Lett 2013; 110:037401. [PMID: 23373949 DOI: 10.1103/physrevlett.110.037401] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Indexed: 06/01/2023]
Abstract
The optical properties of a GaTa(4)Se(8) single crystal are investigated under high pressure. At ambient pressure, the optical conductivity exhibits a charge gap of ≈0.12 eV and a broad midinfrared band at ≈0.55 eV. As pressure is increased, the low energy spectral weight is strongly enhanced and the optical gap is rapidly filled, pointing to an insulator to metal transition around 6 GPa. The overall evolution of the optical conductivity demonstrates that GaTa(4)Se(8) is a Mott insulator which undergoes a bandwidth-controlled Mott metal-insulator transition under pressure, in remarkably good agreement with theory. With the use of our optical data and ab initio band structure calculations, our results were successfully compared to the (U/D, T/D) phase diagram predicted by dynamical mean field theory for strongly correlated systems.
Collapse
Affiliation(s)
- V Ta Phuoc
- GREMAN, CNRS UMR 7347-CEA, Université F. Rabelais, UFR Sciences, Tours, France
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Joseph B, Boeri L, Malavasi L, Capitani F, Artioli GA, Protti S, Fagnoni M, Albini A, Marini C, Baldassarre L, Perucchi A, Lupi S, Postorino P, Dore P. Vibrational spectrum of solid picene (C22H14). J Phys Condens Matter 2012; 24:252203. [PMID: 22635521 DOI: 10.1088/0953-8984/24/25/252203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Recently, Mitsuhashi et al observed superconductivity with a transition temperature up to 18 K in potassium doped picene (C(22)H(14)), a polycyclic aromatic hydrocarbon compound (Mitsuhashi et al 2010 Nature 464 76). Theoretical analysis indicates the importance of electron-phonon coupling in the superconducting mechanisms of these systems, with different emphasis on inter- and intra-molecular vibrations, depending on the approximations used. Here we present a combined experimental and ab initio study of the Raman and infrared spectrum of undoped solid picene, which allows us to unambiguously assign the vibrational modes. This combined study enables the identification of the modes which couple strongly to electrons and hence can play an important role in the superconducting properties of the doped samples.
Collapse
Affiliation(s)
- B Joseph
- Dipartimento di Fisica, Università di Roma Sapienza, Piazzale Aldo Moro 2, 00185 Roma, Italy
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Piccirilli F, Mangialardo S, Lupi S, Postorino P, Perucchi A. Infrared Microspectroscopy study of insulin crystals at high pressure. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/359/1/012014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
25
|
Lupi S, Baldassarre L, Mansart B, Perucchi A, Barinov A, Dudin P, Papalazarou E, Rodolakis F, Rueff JP, Itié JP, Ravy S, Nicoletti D, Postorino P, Hansmann P, Parragh N, Toschi A, Saha-Dasgupta T, Andersen OK, Sangiovanni G, Held K, Marsi M. Erratum: A microscopic view on the Mott transition in chromium-doped V2O3. Nat Commun 2012. [DOI: 10.1038/ncomms1397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
|
26
|
Guidi E, Angelini L, Lupi S, Vicentini CB, Mares D, Manfredini S, Contini C. [Epidemiological, social and public health aspects of tuberculosis in Ferrara in the 19th century]. Infez Med 2011; 19:266-277. [PMID: 22212168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Our first study of tuberculosis in Ferrara during the nineteenth century, whose results have been recently published, focused on disease treatment. Here we present the descriptive analysis of mortality, with the following results being attained: two behavioural patterns are detected with regard to the onset of disease, before and after 1850; TB is a specific disease that affects all parts of the body in all age groups: childhood, and active and passive populations; there are no significant differences with regard to gender; as regards the occupations performed by the deceased, those related to industry and agriculture and to various other activities and services are those with the highest mortality; tuberculosis has a seasonal pattern; summer and autumn are the periods of greatest prevalence (hot weather and humidity are factors that affect the respiratory system); among the forms of tuberculosis it can be observed that up to the year 1850 people died in Ferrara either of pulmonary tuberculosis or TB localised in other areas; from 1851 onward there appears to have been a dramatic change, with a decrease in unspecific diagnosis but the appearance of disease manifestations in its various clinical forms.
Collapse
Affiliation(s)
- E Guidi
- Sezione di Igiene e Medicina del Lavoro, Dipartimento di Medicina Clinica e Sperimentale, Universita di Ferrara, Ferrara, Italy
| | | | | | | | | | | | | |
Collapse
|
27
|
Lupi S, Baldassarre L, Mansart B, Perucchi A, Barinov A, Dudin P, Papalazarou E, Rodolakis F, Rueff JP, Itié JP, Ravy S, Nicoletti D, Postorino P, Hansmann P, Parragh N, Toschi A, Saha-Dasgupta T, Andersen OK, Sangiovanni G, Held K, Marsi M. A microscopic view on the Mott transition in chromium-doped V2O3. Nat Commun 2010; 1:105. [DOI: 10.1038/ncomms1109] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Accepted: 10/07/2010] [Indexed: 11/09/2022] Open
|
28
|
Baldassarre L, Perucchi A, Lupi S, Dore P. Far infrared properties of the rare-earth scandate DyScO3. J Phys Condens Matter 2010; 22:355402. [PMID: 21403288 DOI: 10.1088/0953-8984/22/35/355402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present reflectance measurements in the infrared region on a single crystal the rare-earth scandate DyScO(3). Measurements performed between room temperature and 10 K allow us to determine the frequency of the infrared-active phonons, never investigated experimentally, and to get information on their temperature dependence. A comparison with the phonon peak frequency resulting from ab initio computations is also provided. We finally report detailed data on the frequency dependence of the complex refractive index of DyScO(3) in the terahertz region, which is important in the analysis of terahertz measurements on thin films deposited on DyScO(3).
Collapse
Affiliation(s)
- L Baldassarre
- Sincrotrone Trieste S C p A, S S 14 km 163.5, in Area Science Park, 34012 Basovizza (Trieste), Italy.
| | | | | | | |
Collapse
|
29
|
Nicoletti D, Limaj O, Calvani P, Rohringer G, Toschi A, Sangiovanni G, Capone M, Held K, Ono S, Ando Y, Lupi S. High-temperature optical spectral weight and fermi-liquid renormalization in bi-based cuprate superconductors. Phys Rev Lett 2010; 105:077002. [PMID: 20868070 DOI: 10.1103/physrevlett.105.077002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2010] [Indexed: 05/29/2023]
Abstract
The optical conductivity σ(ω) and the spectral weight W(T) of two superconducting cuprates at optimum doping, Bi2Sr2-xLaxCuO6 and Bi2Sr2CaCu2O8, have been first measured up to 500 K. Above 300 K, W(T) deviates from the usual T2 behavior in both compounds, even though σ(ω→0) remains larger than the Ioffe-Regel limit. The deviation is surprisingly well described by the T4 term of the Sommerfeld expansion, but its coefficients are enhanced by strong correlation, as shown by the good agreement with dynamical mean field calculations.
Collapse
Affiliation(s)
- D Nicoletti
- CNR-SPIN and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro 2, I-00185 Roma, Italy
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Gregorio P, Lupi S. [Regulations for the commercialization of new disinfectants: efficacy studies required for products to be used in foodstuffs, and in industrial, domestic and institutional areas]. Ig Sanita Pubbl 2010; 66:375-385. [PMID: 20859310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Regulations for the commercialization of new disinfectants in Europe are currently going through a transition phase. Up to the present time these were set down by each member State of the European Union while in May 2010 a single European set of regulations (Directive 98/8/CE) will become effective in all Member States, the main aspects of which are discussed in this paper. In particular, we discuss the main points regarding studies and other information to be submitted for obtaining approval of new active substances and for reviewing products already in the market.
Collapse
Affiliation(s)
- P Gregorio
- Sezione di Igiene e Medicina del Lavoro, Dipartimento di Medicina Clinica e Sperimentale, Università degli Studi di Ferrara, Ferrara.
| | | |
Collapse
|
31
|
Lupi S, Marconi S, Paiaro E, Fochesato A, Gregorio P. Mutagenicity evaluation with Ames test of hydro-alcoholic solution of terpenes. J Prev Med Hyg 2009; 50:170-174. [PMID: 20411651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Mutagenic properties of terpenes (both synthesis and plant derived) have been tested, up to now, as a single molecule. A terpenes containing hydro-alcoholic solution deriving from frankincense and myrrh resins and hyssop essential oil was assayed for mutagenicity by means of ames test. Extraction technique conducted with electromagnetic fields at room temperature enabled to obtain a solution of free active molecules that did not undergo thermal degradation and characterized by biocidal activity. In order to verify lack of mutagenic hazard in coming into contact with human, the solution was appropriately diluted and tested with Salmonella typhimurium TA98, TA1535 and YG1024 strains, both in absence and in presence of metabolic system S9. For none of the tested conditions a 2-fold increase of induced revertants, as regards to spontaneous, was registered. The ratio between induced and spontaneous His+ revertants (Mutagenic Index) was around 1.00 in all the determinations and no statistically significant differences have been identified comparing the sample and the negative control. A similar result has been obtained for the dose-response curve. In conclusion, we verified that tested terpenes solution lacks of mutagenicity on Salmonella typhimurium with and without metabolic activator so this plant extract can be safely used as biocide.
Collapse
Affiliation(s)
- S Lupi
- Section of Hygiene and Occupational Medicine, Department of Clinical and Experimental Medicine, University of Ferrara, Italy.
| | | | | | | | | |
Collapse
|
32
|
Perucchi A, Baldassarre L, Postorino P, Lupi S. Optical properties across the insulator to metal transitions in vanadium oxide compounds. J Phys Condens Matter 2009; 21:323202. [PMID: 21693963 DOI: 10.1088/0953-8984/21/32/323202] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We review the optical properties of three vanadium oxide compounds V(2)O(3), VO(2) and V(3)O(5), belonging to the so-called Magnéli phase. Their electrodynamics across a metal to insulator transition is investigated as a function of both temperature and pressure. We analyse thoroughly the optical results, with a special emphasis on the infrared spectral weight. This allows us to discuss the nature of the mechanisms driving the phase transitions in the three compounds, pointing out the role of electron-electron and electron-phonon interactions in the various cases.
Collapse
Affiliation(s)
- A Perucchi
- Sincrotrone Trieste S.C.p.A., Area Science Park, I-34012 Basovizza, Trieste, Italy
| | | | | | | |
Collapse
|
33
|
Lupi S, Nicoletti D, Limaj O, Baldassarre L, Ortolani M, Ono S, Ando Y, Calvani P. Far-infrared absorption and the metal-to-insulator transition in hole-doped cuprates. Phys Rev Lett 2009; 102:206409. [PMID: 19519052 DOI: 10.1103/physrevlett.102.206409] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Indexed: 05/27/2023]
Abstract
By studying the optical conductivity of Bi(2)Sr(2-x)La(x)CuO(6) and Y(0.97)Ca(0.03)Ba(2)Cu(3)O(6), we show that the metal-to-insulator transition in these hole-doped cuprates is driven by the opening of a small gap at low T in the far infrared. Its width is consistent with the observations of angle-resolved photoemission spectroscopy in other cuprates, along the nodal line of the k space. The gap forms as the Drude term turns into a far-infrared absorption, whose peak frequency can be approximately predicted on the basis of a Mott-like transition. Another band in the midinfrared softens with doping but is less sensitive to the metal-to-insulator transition.
Collapse
Affiliation(s)
- S Lupi
- CNR-INFM Coherentia and Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Roma, Italy
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Rodolakis F, Mansart B, Papalazarou E, Gorovikov S, Vilmercati P, Petaccia L, Goldoni A, Rueff JP, Lupi S, Metcalf P, Marsi M. Quasiparticles at the Mott transition in V2O3: wave vector dependence and surface attenuation. Phys Rev Lett 2009; 102:066805. [PMID: 19257621 DOI: 10.1103/physrevlett.102.066805] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Indexed: 05/27/2023]
Abstract
We present an angle resolved photoemission study of V2O3, a prototype system for the observation of Mott transitions in correlated materials. We show that the spectral features corresponding to the quasiparticle peak in the metallic phase present a marked wave vector dependence, with a stronger intensity along the GammaZ direction. The analysis of their intensity for different probing depths shows the existence of a characteristic length scale for the attenuation of coherent electronic excitations at the surface. This length scale, which is larger than the thickness of the surface region as normally defined for noncorrelated electronic states, is found to increase when approaching the Mott transition. These results are in agreement with the behavior of quasiparticles at surfaces as predicted by Borghi et al.
Collapse
Affiliation(s)
- F Rodolakis
- Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Lupi S, Scapoli M, Cervato K, Pizzo F, Rizzello R, Carfora R, Gigli F, Pavanello S, Clonfero E, Gregorio P. Assessment of urinary mutagens presence in a population of non smokers. J Prev Med Hyg 2007; 48:73-78. [PMID: 18274341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The paper presents the early results of a study involving a group of 312 non smoking and not professionally exposed subjects (144 males and 168 females) in order to evaluate the probable presence of urinary mutagens possibly derived from aspecific exposures. Urine samples were assayed by the Ames test on the YG1024 Salmonella typhimurium strain in the presence of S9 mix with plate incorporation method with preincubation. At the moment of sample collection, the subjects were invited to fill a questionnaire on their main characteristics and lifestyle. On the basis of laboratory data analysis, it emerged that, on 288 samples with a valuable mutagenic activity, 20 urinary extracts (8 of which were males and 12 were females) showed mutagenicity levels twice as much as spontaneous revertants. Diet and indoor exposure to passive smoking, fireplace and cooking fume exposure seemed to play a major role among the lifestyle behaviours investigated in generating positive mutagenic response with a statistically significant difference between positive and negative samples induction (Chi square, P = 0.0057 and P = 0.0168 respectively). After correction of induced revertants by means of creatinine excretion determination, it appeared that females, who had the higher mean urinary mutagenic activity, showed a mutagenicity level twice as much as men (364 +/- 491 revertants/mmole creatinine for males against 605 +/- 868 revertants/mmole creatinine in females, Mann-Whitney U-test, z = -3.97, P < 0.0001) possibly in consequence of their greater cooking fumes exposure. The study, that carefully evaluated the characteristics of involved subjects, reveals the presence, even though modest, of mutagens in urine of an apparently not significantly exposed population. In addition, standardization of method leads to suppose little feasible a confounding influence of considered features. Moreover, it would be therefore rather interesting to study the effect of low exposure time persistence.
Collapse
Affiliation(s)
- S Lupi
- Section of Hygiene and Occupational Medicine, Department of Clinical and Experimental Medicine, University of Ferrara, Italy
| | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Arcangeletti E, Baldassarre L, Di Castro D, Lupi S, Malavasi L, Marini C, Perucchi A, Postorino P. Evidence of a pressure-induced metallization process in monoclinic VO2. Phys Rev Lett 2007; 98:196406. [PMID: 17677642 DOI: 10.1103/physrevlett.98.196406] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2006] [Indexed: 05/16/2023]
Abstract
Raman and combined infrared transmission and reflectivity measurements were carried out at room temperature (RT) on monoclinic VO2 over the 0-19 GPa and 0-14 GPa pressure ranges. Both lattice dynamics and optical gap show a remarkable stability up to P* approximately 10 GPa whereas subtle modifications of V ion arrangements within the monoclinic lattice, together with the onset of a metallization process via band gap filling, are observed for P >P*. Differently from P=0, where the VO2 metallic phase is found only in conjunction with the rutile structure above 340 K, a new RT metallic phase within a monoclinic structure appears accessible in the high pressure regime.
Collapse
Affiliation(s)
- E Arcangeletti
- Coherentia CNR-INFM and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Rome, Italy
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Sacchetti A, Arcangeletti E, Perucchi A, Baldassarre L, Postorino P, Lupi S, Ru N, Fisher IR, Degiorgi L. Pressure dependence of the charge-density-wave gap in rare-earth tritellurides. Phys Rev Lett 2007; 98:026401. [PMID: 17358625 DOI: 10.1103/physrevlett.98.026401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Indexed: 05/14/2023]
Abstract
We investigate the pressure dependence of the optical properties of CeTe3, which exhibits an incommensurate charge-density-wave (CDW) state already at 300 K. Our data are collected in the midinfrared spectral range at room temperature and at pressures between 0 and 9 GPa. The energy for the single particle excitation across the CDW gap decreases upon increasing the applied pressure, similarly to the chemical pressure by rare-earth substitution. The broadening of the bands upon lattice compression removes the perfect nesting condition of the Fermi surface and therefore diminishes the impact of the CDW transition on the electronic properties of RTe3.
Collapse
Affiliation(s)
- A Sacchetti
- Laboratorium für Festkörperphysik, ETH-Zürich, CH-8093 Zürich, Switzerland
| | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Ortolani M, Lupi S, Baldassarre L, Schade U, Calvani P, Takano Y, Nagao M, Takenouchi T, Kawarada H. Low-energy electrodynamics of superconducting diamond. Phys Rev Lett 2006; 97:097002. [PMID: 17026393 DOI: 10.1103/physrevlett.97.097002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2006] [Indexed: 05/12/2023]
Abstract
Heavily boron-doped, diamond films can become superconducting with critical temperatures Tc well above 4 K. Here we first measure the reflectivity of such a film down to 5 cm(-1), by also using coherent synchrotron radiation. We thus determine the optical gap 2Delta, the field penetration depth lambda, the range of action of the Ferrell-Glover-Tinkham sum rule, and the electron-phonon spectral function alpha2F(omega). We conclude that diamond behaves as a dirty BCS superconductor.
Collapse
Affiliation(s)
- M Ortolani
- CNR-INFM Coherentia and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro, 2, 00185 Roma, Italy
| | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Toschi A, Capone M, Ortolani M, Calvani P, Lupi S, Castellani C. Temperature dependence of the optical spectral weight in the cuprates: role of electron correlations. Phys Rev Lett 2005; 95:097002. [PMID: 16197238 DOI: 10.1103/physrevlett.95.097002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2005] [Indexed: 05/04/2023]
Abstract
We compare calculations based on the dynamical mean-field theory of the Hubbard model with the infrared spectral weight W(Omega,T) of La(2-x)SrxCuO4 and other cuprates. Without using fitting parameters we show that most of the anomalies found in W(Omega,T) with respect to normal metals, including the existence of two different energy scales for the doping and the T dependence of W(Omega,T), can be ascribed to strong correlation effects.
Collapse
Affiliation(s)
- A Toschi
- Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Rome, Italy
| | | | | | | | | | | |
Collapse
|
40
|
Ortolani M, Calvani P, Lupi S. Frequency-dependent thermal response of the charge system and the restricted sum rules of La2-xSrxCuO4. Phys Rev Lett 2005; 94:067002. [PMID: 15783767 DOI: 10.1103/physrevlett.94.067002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2004] [Indexed: 05/24/2023]
Abstract
In La2-xSrxCuO4 (LSCO) the spectral weight W=integralOmega0sigma(ab)1(omega,T)domega [where sigma(ab)1(omega,T) is the ab-plane conductivity] obeys the same law W=W0-BOmegaT2 as in a conventional metal such as gold, for any Omega up to the plasma edge. However, in LSCO BOmega points toward correlation effects and, unlike in gold, is related to an energy scale tT<<t0 approximately W0. The Ferrell-Glover-Tinkham sum rule is fulfilled in LSCO superconductors for Omega greater than or approximately equal to 2000 cm(-1).
Collapse
Affiliation(s)
- M Ortolani
- "Coherentia"-INFM and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Roma, Italy
| | | | | |
Collapse
|
41
|
Simioli P, Lupi S, Gregorio P, Siwinska E, Mielzynska D, Clonfero E, Pavanello S. Non-smoking coke oven workers show an occupational PAH exposure-related increase in urinary mutagens. Mutat Res 2004; 562:103-10. [PMID: 15279833 DOI: 10.1016/j.mrgentox.2004.05.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2004] [Revised: 05/05/2004] [Accepted: 05/20/2004] [Indexed: 10/26/2022]
Abstract
We examined the urinary mutagenicity in the YG1024 Salmonella typhimurium strain in the presence of S9 mix, of 31 male non-smoking coke oven workers and an equal number of controls matched for gender and dietary habits. Occupational PAH exposure to the workers was assessed by means of the individual urinary post-shift excretion of 1-pyrenol (mean +/- S.D.: 5.41 +/- 6.06 micromole/mol creatinine). Eleven urinary extracts of workers (35.5%) were clearly mutagenic (with at least a doubling of the number of spontaneous revertants), against only two samples in the control group (6.5%) (chi2-test; chi2 = 7.883; P < 0.01). Moreover, the mean mutagenic activity level corrected for dilution/concentration of the urine was about three times higher in coke oven workers than in matched controls (mean +/- S.D. (range) 495 +/- 407 (89.7-1603) versus 186 +/- 113 (14.2-524) net revertants/mmol creatinine; Mann-Whitney U-test, z = 3.86, P < 0.001). Simple linear regression analysis showed that the coke workers' urinary mutagenic activity is associated with the PAH occupation-related urinary excretion of 1-pyrenol (r = 0.41, P = 0.0215). This study definitely demonstrates an occupation-related exposure of coke oven workers' bladder epithelium to mutagenic PAH metabolites. This factor, mainly in the case of high exposure studied here, may account for a higher bladder cancer risk in coke oven workers.
Collapse
Affiliation(s)
- P Simioli
- Section of Hygiene and Occupational Medicine, Department of Clinical and Experimental Medicine, University of Ferrara, Italy
| | | | | | | | | | | | | |
Collapse
|
42
|
Brescacin L, Caruso G, Lupi S, Benchuga G, Papadopulos M, Brescacin L, Gioseffi L, Lago M, Damis H, Elizari M. PLASMA RENIN AND AMBULATORY BLOOD PRESSURE ARE INDEPENDENTLY RELATED TO LEFT VENTRICLE DIASTOLIC FUNCTION IN YOUNG NORMOTENSIVE AND EARLY MILD HYPERTENSIVE SUBJECTS. J Hypertens 2004. [DOI: 10.1097/00004872-200402001-00740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
43
|
Ortolani M, Lupi S, Morano V, Calvani P, Maselli P, Maritato L, Fujita M, Yamada K, Colapietro M. Optical Conductivity of La1.875Ba0.04Sr0.085CuO4. ACTA ACUST UNITED AC 2004. [DOI: 10.1023/b:josc.0000011855.18816.7b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
44
|
Rosso GL, Barbarito N, Lupi S, Candura SM. [Sleep-disordered breathing and occupational medicine: considerations on three clinical cases]. G Ital Med Lav Ergon 2004; 26:33-8. [PMID: 15134397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Three subjects suffering from sleep-disordered breathing are described. Two of them (a 37-year-old lorry driver with obstructive sleep apnea, and a 47-year-old bricklayer with upper airway resistance syndrome) had suffered several accidents at work in few months, due to daytime sleepiness. The third patient (45-year-old) had developed (central and obstructive) sleep apnea after having been exposed to organic solvents for 15 years as a painter. In all the three subjects, polysomnography led to correct diagnosis, and nocturnal ventilotherapy with nasal CPAP (continuous positive airway pressure) considerably improved the clinical picture. The cases presented illustrate the twofold interest of sleep-disordered breathing for Occupational Medicine: on the one hand, these syndromes may reduce job performance and increase the accident risk; on the other hand, they may recognize as a risk factor the occupational exposure to solvents.
Collapse
Affiliation(s)
- G L Rosso
- Divisione di Medicina del Lavoro, Fondazione Salvatore Maugeri, Clinica del Lavoro e della Riabilitazione, IRCCS, Istituto Scientifico di Pavia, Italy
| | | | | | | |
Collapse
|
45
|
Lucarelli A, Lupi S, Ortolani M, Calvani P, Maselli P, Capizzi M, Giura P, Eisaki H, Kikugawa N, Fujita T, Fujita M, Yamada K. Phase diagram of La2-xSrxCuO4 probed in the infared: imprints of charge stripe excitations. Phys Rev Lett 2003; 90:037002. [PMID: 12570518 DOI: 10.1103/physrevlett.90.037002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2002] [Indexed: 05/24/2023]
Abstract
While there is increasing evidence for antiferromagnetic (AF) ordering in the Cu-O planes of high-T(c) superconductors, either static or fluctuating, there is no direct evidence so far for the charge stripes that should separate the AF domains. By investigating the optical response of La2-xSrxCuO4 for 0<or=x<or=0.26 and 30<or=T<or=295 K, we identify strong far infrared peaks whose energy, width, and intensity are consistent with a scenario of charge stripe dynamics in the Cu-O planes.
Collapse
Affiliation(s)
- A Lucarelli
- Coherentia-INFM and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Roma, Italy
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Pavanello S, Simioli P, Mastrangelo G, Lupi S, Gabbani G, Gregorio P, Clonfero E. Role of metabolic polymorphisms NAT2 and CYP1A2 on urinary mutagenicity after a pan-fried hamburger meal. Food Chem Toxicol 2002; 40:1139-44. [PMID: 12067576 DOI: 10.1016/s0278-6915(02)00038-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In this work the phenotyping approach was used to study the influence of metabolic polymorphisms NAT2 and CYP1A2 on S9-mediated urinary mutagenicity, detected with Salmonella strain YG1024, in 50 subjects after a meal of pan-fried hamburgers. All 50 post-meal samples, but not pre-meal ones, were clearly mutagenic (number of urine samples able to double number of spontaneous revertants was 50 to 0, respectively). CYP1A2 positively influences urinary mutagenicity: a rise in CYP1A2 activity increases levels of post-meal urinary mutagens (1.16+/-0.91 vs 1.72+/-1.19 7-h minimum mutagenic doses (MMDs)/intake), especially in NAT2 slow acetylators (2.18+/-1.33 vs 0.90+/-0.54 7-h MMDs/intake, Mann-Whitney U-test, P<0.05). NAT2 rapid acetylators exert lower post-meal urinary mutagenicity than slow ones (1.41+/-1.02 vs 1.77+/-2.45 7-h MMDs/intake) and even more if the latter are extensive CYP1A2 metabolizers (1.41+/-1.02 vs 2.18+/-1.33 7-h MMDs/intake), but the difference did not reach statistical significance. In conclusion, this study indicates that CYP1A2 and NAT2 activities influence the presence of urinary mutagens after a meal of pan-fried hamburger (rich in HHAs) and consequently their potential genotoxic risk.
Collapse
Affiliation(s)
- S Pavanello
- Section of Occupational Health, Department of Environmental Medicine and Public Health, University of Padova, Italy.
| | | | | | | | | | | | | |
Collapse
|
47
|
|
48
|
Paita L, Lupi S, Biscaldi G. [Professional anamnesis and information: considerations on a clinical case]. G Ital Med Lav Ergon 1998; 20:138-9. [PMID: 9788053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Work history and information about risks represent two main instances in occupational medicine, the first one in order to formulate the diagnosis of occupational disease, the second one for the health education of workers. As far as this is concerned we describe the clinical case of a patient admitted for a cutaneous manifestation of suspected allergic nature. After a careful evaluation of the work related risk factors it turned out to be a cutaneous rash caused by exposure to dimethylformammide and concomitant consumption of alcohol. A correct information about substances used in the workplace and about subsequent hygienic rules would have avoided the appearance of the clinical manifestation and a useless admission.
Collapse
Affiliation(s)
- L Paita
- Fondazione S. Maugeri, Istituto di Pavia
| | | | | |
Collapse
|
49
|
Marcelli A, Burattini E, Mencuccini C, Calvani P, Nucara A, Lupi S, Sanchez Del Rio M. SINBAD, a brilliant IR source from the DAPhiNE storage ring. J Synchrotron Radiat 1998; 5:575-577. [PMID: 15263583 DOI: 10.1107/s0909049598000661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/1997] [Accepted: 01/09/1998] [Indexed: 05/24/2023]
Abstract
SINBAD is the Italian IR synchrotron radiation beamline, designed to work at wavelengths greater than 10 micro m. It is being installed on DAPhiNE, a new collider that is designed to work at 0.51 GeV with a beam current up to 5 A. Due to such a high current, the IR extracted from a bending magnet will be more brilliant than that of a black body at 2000 K by two orders of magnitude at 100 micro m. The beamline optical system, projected by ray-tracing simulation, consists of six mirrors that first focus the radiation on a wedged CVD diamond-film window and then transfer the collimated beam to the experimental area where a Michelson interferometer will be installed.
Collapse
Affiliation(s)
- A Marcelli
- INFN-LNF, PO Box 13, 00044 Frascati, Italy
| | | | | | | | | | | | | |
Collapse
|
50
|
|