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Hua C, Tennant DA, Savici AT, Sedov V, Sala G, Winn B. Implementation of a laser-neutron pump-probe capability for inelastic neutron scattering. Rev Sci Instrum 2024; 95:033902. [PMID: 38445995 DOI: 10.1063/5.0181310] [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: 10/16/2023] [Accepted: 02/10/2024] [Indexed: 03/07/2024]
Abstract
Knowledge about nonequilibrium dynamics in spin systems is of great importance to both fundamental science and technological applications. Inelastic neutron scattering (INS) is an indispensable tool to study spin excitations in complex magnetic materials. However, conventional INS spectrometers currently only perform steady-state measurements and probe averaged properties over many collision events between spin excitations in thermodynamic equilibrium, while the exact picture of re-equilibration of these excitations remains unknown. In this paper, we report on the design and implementation of a time-resolved laser-neutron pump-probe capability at hybrid spectrometer (beamline 14-B) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. This capability allows us to excite out-of-equilibrium magnons with a nanosecond pulsed laser source and probe the resulting dynamics using INS. Here, we discussed technical aspects to implement such a capability in a neutron beamline, including choices of suitable neutron instrumentation and material systems, laser excitation scheme, experimental configurations, and relevant firmware and software development to allow for time-synchronized pump-probe measurements. We demonstrated that the laser-induced nonequilibrium structure factor is able to be resolved by INS in a quantum magnet. The method developed in this work will provide SNS with advanced capabilities for performing out-of-equilibrium measurements, opening up an entirely new research direction to study out-of-equilibrium phenomena using neutrons.
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Affiliation(s)
- C Hua
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D A Tennant
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
- Shull Wollan Center-A joint Institute for Neutron Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A T Savici
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - V Sedov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G Sala
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B Winn
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Scheie A, Benton O, Taillefumier M, Jaubert LDC, Sala G, Jalarvo N, Koohpayeh SM, Shannon N. Dynamical Scaling as a Signature of Multiple Phase Competition in Yb_{2}Ti_{2}O_{7}. Phys Rev Lett 2022; 129:217202. [PMID: 36461963 DOI: 10.1103/physrevlett.129.217202] [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: 02/22/2022] [Revised: 07/25/2022] [Accepted: 10/28/2022] [Indexed: 06/17/2023]
Abstract
Yb_{2}Ti_{2}O_{7} is a celebrated example of a pyrochlore magnet with highly frustrated, anisotropic exchange interactions. To date, attention has largely focused on its unusual, static properties, many of which can be understood as coming from the competition between different types of magnetic order. Here we use inelastic neutron scattering with exceptionally high energy resolution to explore the dynamical properties of Yb_{2}Ti_{2}O_{7}. We find that spin correlations exhibit dynamical scaling, analogous to behavior found near to a quantum critical point. We show that the observed scaling collapse can be explained within a phenomenological theory of multiple-phase competition, and confirm that a scaling collapse is also seen in semiclassical simulations of a microscopic model of Yb_{2}Ti_{2}O_{7}. These results suggest that dynamical scaling may be general to systems with competing ground states.
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Affiliation(s)
- A Scheie
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - O Benton
- Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, Dresden 01187, Germany
| | - M Taillefumier
- ETH Zurich, Swiss National Supercomputing Centre (CSCS), HIT G-floor Wolfgang-Pauli-Str. 27, 8093 Zurich, Switzerland
| | - L D C Jaubert
- CNRS, Université de Bordeaux, LOMA, UMR 5798, 33400 Talence, France
| | - G Sala
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Jalarvo
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S M Koohpayeh
- Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
- Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - N Shannon
- Theory of Quantum Matter Unit, Okinawa Institute of Science and Technology Graduate University, Onna son, Okinawa 904-0495, Japan
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Sala G, Mourigal M, Boone C, Butch NP, Christianson AD, Delaire O, DeSantis AJ, Hart CL, Hermann RP, Huegle T, Kent DN, Lin JYY, Lumsden MD, Manley ME, Quirinale DG, Stone MB, Z Y. CHESS: The future direct geometry spectrometer at the second target station. Rev Sci Instrum 2022; 93:065109. [PMID: 35778024 DOI: 10.1063/5.0089740] [Citation(s) in RCA: 1] [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: 02/28/2022] [Accepted: 05/25/2022] [Indexed: 06/15/2023]
Abstract
CHESS, chopper spectrometer examining small samples, is a planned direct geometry neutron chopper spectrometer designed to detect and analyze weak signals intrinsic to small cross sections (e.g., small mass, small magnetic moments, or neutron absorbing materials) in powders, liquids, and crystals. CHESS is optimized to enable transformative investigations of quantum materials, spin liquids, thermoelectrics, battery materials, and liquids. The broad dynamic range of the instrument is also well suited to study relaxation processes and excitations in soft and biological matter. The 15 Hz repetition rate of the Second Target Station at the Spallation Neutron Source enables the use of multiple incident energies within a single source pulse, greatly expanding the information gained in a single measurement. Furthermore, the high flux grants an enhanced capability for polarization analysis. This enables the separation of nuclear from magnetic scattering or coherent from incoherent scattering in hydrogenous materials over a large range of energy and momentum transfer. This paper presents optimizations and technical solutions to address the key requirements envisioned in the science case and the anticipated uses of this instrument.
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Affiliation(s)
- G Sala
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M Mourigal
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - C Boone
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N P Butch
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - A D Christianson
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - O Delaire
- Department of Physics, Duke University, Durham, North Carolina 27708, USA
| | - A J DeSantis
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C L Hart
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R P Hermann
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Huegle
- Neutron Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D N Kent
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Y Y Lin
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M D Lumsden
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M E Manley
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D G Quirinale
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M B Stone
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Y Z
- Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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Vicencio JM, Evans R, Green R, An Z, Deng J, Treacy C, Mustapha R, Monypenny J, Costoya C, Lawler K, Ng K, De-Souza K, Coban O, Gomez V, Clancy J, Chen SH, Chalk A, Wong F, Gordon P, Savage C, Gomes C, Pan T, Alfano G, Dolcetti L, Chan JNE, Flores-Borja F, Barber PR, Weitsman G, Sosnowska D, Capone E, Iacobelli S, Hochhauser D, Hartley JA, Parsons M, Arnold JN, Ameer-Beg S, Quezada SA, Yarden Y, Sala G, Ng T. Osimertinib and anti-HER3 combination therapy engages immune dependent tumor toxicity via STING activation in trans. Cell Death Dis 2022; 13:274. [PMID: 35347108 PMCID: PMC8960767 DOI: 10.1038/s41419-022-04701-3] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 02/07/2022] [Accepted: 03/01/2022] [Indexed: 11/28/2022]
Abstract
Over the past decade, immunotherapy delivered novel treatments for many cancer types. However, lung cancer still leads cancer mortality, and non-small-cell lung carcinoma patients with mutant EGFR cannot benefit from checkpoint inhibitors due to toxicity, relying only on palliative chemotherapy and the third-generation tyrosine kinase inhibitor (TKI) osimertinib. This new drug extends lifespan by 9-months vs. second-generation TKIs, but unfortunately, cancers relapse due to resistance mechanisms and the lack of antitumor immune responses. Here we explored the combination of osimertinib with anti-HER3 monoclonal antibodies and observed that the immune system contributed to eliminate tumor cells in mice and co-culture experiments using bone marrow-derived macrophages and human PBMCs. Osimertinib led to apoptosis of tumors but simultaneously, it triggered inositol-requiring-enzyme (IRE1α)-dependent HER3 upregulation, increased macrophage infiltration, and activated cGAS in cancer cells to produce cGAMP (detected by a lentivirally transduced STING activity biosensor), transactivating STING in macrophages. We sought to target osimertinib-induced HER3 upregulation with monoclonal antibodies, which engaged Fc receptor-dependent tumor elimination by macrophages, and STING agonists enhanced macrophage-mediated tumor elimination further. Thus, by engaging a tumor non-autonomous mechanism involving cGAS-STING and innate immunity, the combination of osimertinib and anti-HER3 antibodies could improve the limited therapeutic and stratification options for advanced stage lung cancer patients with mutant EGFR.
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Affiliation(s)
- J M Vicencio
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK.
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK.
| | - R Evans
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - R Green
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - Z An
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - J Deng
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - C Treacy
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - R Mustapha
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - J Monypenny
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - C Costoya
- Cancer Immunology Unit, Cancer Institute, University College London, London, UK
| | - K Lawler
- Wellcome Trust-MRC Institute of Metabolic Science, Addenbrooke's Hospital, Cambridge, UK
| | - K Ng
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - K De-Souza
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - O Coban
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - V Gomez
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
| | - J Clancy
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
| | - S H Chen
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
| | - A Chalk
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
| | - F Wong
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - P Gordon
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - C Savage
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - C Gomes
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
| | - T Pan
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - G Alfano
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - L Dolcetti
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - J N E Chan
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - F Flores-Borja
- Centre for Immunobiology and Regenerative Medicine, Barts & The London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - P R Barber
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - G Weitsman
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - D Sosnowska
- School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - E Capone
- Department of Innovative Technologies in Medicine & Dentistry, University of Chieti-Pescara, Center for Advanced Studies and Technology (CAST), Chieti, Italy
| | | | - D Hochhauser
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
| | - J A Hartley
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK
| | - M Parsons
- Randall Centre for Cell and Molecular Biophysics, King's College London, London, UK
| | - J N Arnold
- School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - S Ameer-Beg
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK
| | - S A Quezada
- Cancer Immunology Unit, Cancer Institute, University College London, London, UK
| | - Y Yarden
- Department of Biological Regulation, The Weizmann Institute of Science, Rehovot, Israel
| | - G Sala
- Department of Innovative Technologies in Medicine & Dentistry, University of Chieti-Pescara, Center for Advanced Studies and Technology (CAST), Chieti, Italy
| | - T Ng
- Molecular Oncology Group, Cancer Institute, Paul O'Gorman Building, University College London, London, UK.
- Richard Dimbleby Laboratory of Cancer Research, School of Cancer & Pharmaceutical Sciences, King's College London, London, UK.
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Boccardo A, Compiani R, Baldi G, Pravettoni D, Grossi S, Sala G, Taylor S, Neville E, Sgoifo Rossi C. Effects of a supplemental calcareous marine algae bolus
on blood calcium concentration in dairy heifers. J Anim Feed Sci 2022. [DOI: 10.22358/jafs/144919/2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Al-Qasir II, Cheng Y, Lin JY, Campbell AA, Sala G, Ramic K, Islam FF, Qteish A, Marsden B, Abernathy DL, Stone MB. Neutron thermalization in nuclear graphite: A modern story of a classic moderator. ANN NUCL ENERGY 2021. [DOI: 10.1016/j.anucene.2021.108437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sala G, Caruso T, Marra FP, Zafonte F, Amico Roxas A, Schiavo B, Galia A, Brunori A, Dini F, Regni L, Proietti P, La Mantia T. Study of energetic properties of different tree organs in six Olea europaea L. cultivars. Sci Rep 2021; 11:17047. [PMID: 34426619 PMCID: PMC8382763 DOI: 10.1038/s41598-021-96436-y] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Accepted: 07/31/2021] [Indexed: 11/30/2022] Open
Abstract
Pruning is an important horticultural practice for the management of olive orchards (Olea europaea L.) that generates a considerable amount of residues every year. Olive orchards are increasingly expanding beyond the Mediterranean Basin to new growing Countries (Australia, California, Argentina, Chile and Uruguay) and this will certainly lead to larger availability of pruning material. Currently, the interest in use of olive tree pruning residues for energy purposes is increasing but unfortunately, the information on the differences among organs of the tree, in terms of calorific value and ash content, is scarce. Another unknown aspect is the effect of cultivar vigour on dry matter partition among different tree organs, these are important traits to establish the energetic quality of pruning residues. The aim of this research was to study energetic aspects of six olive cultivars, largely grown in the Sicilian olive industry and characterized by different vigour. The trees taken into consideration in the study were selected in an experimental orchard to avoid any effect due to differences in environmental conditions and management. The energetic characteristics, calorific value and ash content, were evaluated for the various tree organs particularly shoots, leaves and branches; also root system was evaluated, although the roots can only be used once the trees are uprooted. Significant differences were observed in the calorific values among the different tree organs and the cultivars. Regarding the ash, shoots and leaves showed the highest content with respect to the other organs, thus causing a possible tendency in slagging with fouling and corrosion of boiler components.
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Affiliation(s)
- G Sala
- Department of Agricultural, Food and Forestry Science, University of Palermo, Viale delle Scienze, Ed. 4, 90128, Palermo, Italy. .,Department of Landscape Design and Sustainable Ecosystems, Peoples' Friendship University of Russia, Miklukho-Maklaya str., 6, Moscow, Russia.
| | - T Caruso
- Department of Agricultural, Food and Forestry Science, University of Palermo, Viale delle Scienze, Ed. 4, 90128, Palermo, Italy
| | - F P Marra
- Department of Agricultural, Food and Forestry Science, University of Palermo, Viale delle Scienze, Ed. 4, 90128, Palermo, Italy.,Department of Architecture, University of Palermo, Viale delle Scienze, Ed. 8, 90128, Palermo, Italy
| | - F Zafonte
- Department of Agricultural, Food and Forestry Science, University of Palermo, Viale delle Scienze, Ed. 4, 90128, Palermo, Italy
| | - A Amico Roxas
- Department of Plant Sciences, University of California, Davis, One Shields Ave., Davis, CA, 95616, USA
| | - B Schiavo
- Department of Engineering, Chemical, Biochemical and Materials Engineering, Hydraulics, University of Palermo, Viale delle Scienze, Ed. 6, 90128, Palermo, Italy
| | - A Galia
- Department of Engineering, Chemical, Biochemical and Materials Engineering, Hydraulics, University of Palermo, Viale delle Scienze, Ed. 6, 90128, Palermo, Italy
| | - A Brunori
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX giugno, 74, 06121, Perugia, Italy
| | - F Dini
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX giugno, 74, 06121, Perugia, Italy
| | - L Regni
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX giugno, 74, 06121, Perugia, Italy
| | - P Proietti
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX giugno, 74, 06121, Perugia, Italy
| | - T La Mantia
- Department of Agricultural, Food and Forestry Science, University of Palermo, Viale delle Scienze, Ed. 4, 90128, Palermo, Italy
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Tian W, Fishman RS, Cao HB, Sala G, Pajerowski DM, Garlea VO, Hong T, Daemen LL, Cheng YQ, Fernandez-Baca JA. IInvestigating the nature of the magnetoelectric coupling in molecular (ND4)2[FeCl5(D2O)] via neutron scattering studies. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321094599] [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: 11/10/2022] Open
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Pravettoni D, Buczinski S, Sala G, Ferrulli V, Bianchi F, Boccardo A. Short communication: Diagnostic accuracy of focused lung ultrasonography as a rapid method for the diagnosis of respiratory disease in dairy calves. J Dairy Sci 2021; 104:4929-4935. [PMID: 33663827 DOI: 10.3168/jds.2020-19377] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 12/09/2020] [Indexed: 11/19/2022]
Abstract
This study estimates the accuracy of the focused lung ultrasound (FLUS) compared with systematic thoracic ultrasonography (TUS) as the reference test for diagnosing pneumonia in pre- and postweaned dairy calves. One hundred thirty-five Holstein Friesian calves, aged between 1 to 6 mo were enrolled and were kept in the same pen with one or more animals showing signs of bovine respiratory disease complex (BRDC). One operator performed FLUS on each calf, and then a second, blinded operator performed TUS on the same calf. For the FLUS, we only scanned the lung lobes that are most frequently affected during BRDC and are thus easier to detect, such as the caudal aspect of the cranial lobe of the left lung (fifth and fourth left intercostal spaces; ICS), the middle lobe of the right lung (fifth right ICS), and the caudal aspect of the cranial lobe of the right lung (fourth right ICS). Pneumonia was diagnosed when a calf had a minimum of one small lobular lung lesion that was at least 1 cm deep within a normally aerated lobe (TUS score of ≥2). Diagnostic accuracy indexes of the FLUS were calculated using TUS as the gold standard. The McNemar test was performed to evaluate the differences between the 2 techniques. In addition, an intertest agreement was assessed using the weighted kappa test. A total of 76 out of 135 calves had a TUS score of ≥2 and were therefore considered to be affected by BRDC. The FLUS had a sensitivity of 81.6% (95% CI = 71.0-89.5%), specificity = 100% (95% CI = 93.9-100%), positive predictive value was 100%, negative predictive value was 96.6% (95% CI = 94.7---97.9%), and accuracy was 97% (95% CI = 92.6-99.2%). The McNemar test highlighted a difference of 10.3% between the FLUS and TUS. The agreement between the TUS and FLUS was substantial (weighted kappa test 0.78). Although FLUS shows some limitations in diagnosing lung lesions associated with BRDC compared with the systematic approach, this study shows that the focused method could be used as an additional tool for evaluating consolidation, especially when examining a large number of postweaned dairy calves.
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Affiliation(s)
- D Pravettoni
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy
| | - S Buczinski
- Département de Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 rue Sicotte, St-Hyacinthe, J2S 2M2, Québec, Canada
| | - G Sala
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy.
| | - V Ferrulli
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy
| | - F Bianchi
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy
| | - A Boccardo
- Dipartimento di Medicina Veterinaria, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy
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DuttaGupta S, Kurenkov A, Tretiakov OA, Krishnaswamy G, Sala G, Krizakova V, Maccherozzi F, Dhesi SS, Gambardella P, Fukami S, Ohno H. Spin-orbit torque switching of an antiferromagnetic metallic heterostructure. Nat Commun 2020; 11:5715. [PMID: 33177506 PMCID: PMC7658218 DOI: 10.1038/s41467-020-19511-4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 10/14/2020] [Indexed: 11/09/2022] Open
Abstract
The ability to represent information using an antiferromagnetic material is attractive for future antiferromagnetic spintronic devices. Previous studies have focussed on the utilization of antiferromagnetic materials with biaxial magnetic anisotropy for electrical manipulation. A practical realization of these antiferromagnetic devices is limited by the requirement of material-specific constraints. Here, we demonstrate current-induced switching in a polycrystalline PtMn/Pt metallic heterostructure. A comparison of electrical transport measurements in PtMn with and without the Pt layer, corroborated by x-ray imaging, reveals reversible switching of the thermally-stable antiferromagnetic Néel vector by spin-orbit torques. The presented results demonstrate the potential of polycrystalline metals for antiferromagnetic spintronics.
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Affiliation(s)
- Samik DuttaGupta
- Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan. .,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan. .,Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
| | - A Kurenkov
- Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Oleg A Tretiakov
- School of Physics, The University of New South Wales, Sydney, 2052, Australia
| | - G Krishnaswamy
- Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
| | - G Sala
- Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
| | - V Krizakova
- Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
| | - F Maccherozzi
- Diamond Light Source, Chilton, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - S S Dhesi
- Diamond Light Source, Chilton, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - P Gambardella
- Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
| | - S Fukami
- Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Innovative Integrated Electronic Systems, Tohoku University, 468-1 Aramaki Aza Aoba, Aoba-ku, Sendai, 980-0845, Japan.,WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - H Ohno
- Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Innovative Integrated Electronic Systems, Tohoku University, 468-1 Aramaki Aza Aoba, Aoba-ku, Sendai, 980-0845, Japan.,WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
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11
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Ávila G, Catozzi C, Pravettoni D, Sala G, Martino P, Meroni G, Lecchi C, Ceciliani F. In vitro effects of conjugated linoleic acid (CLA) on inflammatory functions of bovine monocytes. J Dairy Sci 2020; 103:8554-8563. [PMID: 32684447 DOI: 10.3168/jds.2020-18659] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 05/04/2020] [Indexed: 12/17/2022]
Abstract
The conjugated linoleic acid (CLA) isomers, a group of naturally occurring isomers of the essential fatty acid (FA) linoleic acid, have received special attention in animal and human nutrition. Although they have long been used as dietary integrators in dairy cows, the effects of CLA isomers on bovine immune cells remain mostly undisclosed. The present study aimed to cover this gap and investigate the in vitro effects of CLA on inflammatory functions, including chemotaxis, phagocytosis, killing capability, and extracellular respiratory burst of purified bovine monocytes (CD14+). The apoptosis rate of monocytes was addressed as well. Once assessed, the effects of different concentrations (10, 50, 100, and 500 μM) of the 2 main CLA isomers, namely cis-9,trans-11 and trans-10,cis-12, the experiments were carried out using a concentration of 50 μM of the CLA isomers, both individually and in a mixture (50:50). The immunomodulatory activities of linoleic acid, an essential FA, and stearic acid, a saturated FA, were also investigated. Only the 50:50 CLA mixture was able to reduce monocyte apoptosis and to increase the extracellular respiratory burst during experimental proinflammatory conditions, as assessed by measuring production of reactive oxygen species. Linoleic acid and CLA had no effects on chemotaxis, phagocytosis, or killing capability. Remarkably, treatment of monocytes with stearic acid significantly reduced their chemotactic capability. The present results demonstrated that CLA isomers do have immunomodulatory effects on some functions of bovine monocytes, and that the mixture of the 2 CLA isomers is more effective than the CLA isomers individually.
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Affiliation(s)
- G Ávila
- Department of Veterinary Medicine, Università Degli Studi di Milano, 26900, Milano, Italy
| | - C Catozzi
- Department of Veterinary Medicine, Università Degli Studi di Milano, 26900, Milano, Italy
| | - D Pravettoni
- Department of Veterinary Medicine, Università Degli Studi di Milano, 26900, Milano, Italy
| | - G Sala
- Department of Veterinary Medicine, Università Degli Studi di Milano, 26900, Milano, Italy
| | - P Martino
- Department of Veterinary Medicine, Università Degli Studi di Milano, 26900, Milano, Italy
| | - G Meroni
- Department of Veterinary Medicine, Università Degli Studi di Milano, 26900, Milano, Italy
| | - C Lecchi
- Department of Veterinary Medicine, Università Degli Studi di Milano, 26900, Milano, Italy
| | - F Ceciliani
- Department of Veterinary Medicine, Università Degli Studi di Milano, 26900, Milano, Italy.
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12
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Durrant C, Fuehring JI, Willemetz A, Chrétien D, Sala G, Ghidoni R, Katz A, Rötig A, Thelestam M, Ermonval M, Moore SEH. Defects in Galactose Metabolism and Glycoconjugate Biosynthesis in a UDP-Glucose Pyrophosphorylase-Deficient Cell Line Are Reversed by Adding Galactose to the Growth Medium. Int J Mol Sci 2020; 21:ijms21062028. [PMID: 32188137 PMCID: PMC7139386 DOI: 10.3390/ijms21062028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/05/2020] [Accepted: 03/10/2020] [Indexed: 12/28/2022] Open
Abstract
UDP-glucose (UDP-Glc) is synthesized by UGP2-encoded UDP-Glc pyrophosphorylase (UGP) and is required for glycoconjugate biosynthesis and galactose metabolism because it is a uridyl donor for galactose-1-P (Gal1P) uridyltransferase. Chinese hamster lung fibroblasts harboring a hypomrphic UGP(G116D) variant display reduced UDP-Glc levels and cannot grow if galactose is the sole carbon source. Here, these cells were cultivated with glucose in either the absence or presence of galactose in order to investigate glycoconjugate biosynthesis and galactose metabolism. The UGP-deficient cells display < 5% control levels of UDP-Glc/UDP-Gal and > 100-fold reduction of [6-3H]galactose incorporation into UDP-[6-3H]galactose, as well as multiple deficits in glycoconjugate biosynthesis. Cultivation of these cells in the presence of galactose leads to partial restoration of UDP-Glc levels, galactose metabolism and glycoconjugate biosynthesis. The Vmax for recombinant human UGP(G116D) with Glc1P is 2000-fold less than that of the wild-type protein, and UGP(G116D) displayed a mildly elevated Km for Glc1P, but no activity of the mutant enzyme towards Gal1P was detectable. To conclude, although the mechanism behind UDP-Glc/Gal production in the UGP-deficient cells remains to be determined, the capacity of this cell line to change its glycosylation status as a function of extracellular galactose makes it a useful, reversible model with which to study different aspects of galactose metabolism and glycoconjugate biosynthesis.
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Affiliation(s)
- Christelle Durrant
- INSERM U1149, Université de Paris, 16 rue Henri Huchard, 75018 Paris, France; (C.D.); (A.W.)
| | - Jana I. Fuehring
- Institute for Clinical Biochemistry, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany;
| | - Alexandra Willemetz
- INSERM U1149, Université de Paris, 16 rue Henri Huchard, 75018 Paris, France; (C.D.); (A.W.)
| | - Dominique Chrétien
- UMR1163, Université Paris Decartes, Sorbonnes Paris Cité, Institut Imagine, 24 Boulevard du Montparnasse, 75015 Paris, France; (D.C.); (A.R.)
| | - Giusy Sala
- “Aldo Ravelli” Research Center and Department of Health Sciences, University of Milan, 20146 Milan, Italy; (G.S.); (R.G.)
| | - Riccardo Ghidoni
- “Aldo Ravelli” Research Center and Department of Health Sciences, University of Milan, 20146 Milan, Italy; (G.S.); (R.G.)
| | - Abram Katz
- Department of Physiology and Pharmacology, Karolinska Institutet, 17177 Stockholm, Sweden;
| | - Agnès Rötig
- UMR1163, Université Paris Decartes, Sorbonnes Paris Cité, Institut Imagine, 24 Boulevard du Montparnasse, 75015 Paris, France; (D.C.); (A.R.)
| | - Monica Thelestam
- Department of Cell and Molecular Biology, Karolinska Institutet, 17177 Stockholm, Sweden;
| | - Myriam Ermonval
- Institut Pasteur, Department of Virology, 25 rue du Dr. Roux, 75015 Paris, France;
| | - Stuart E. H. Moore
- INSERM U1149, Université de Paris, 16 rue Henri Huchard, 75018 Paris, France; (C.D.); (A.W.)
- Correspondence:
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13
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Maharaj DD, Sala G, Stone MB, Kermarrec E, Ritter C, Fauth F, Marjerrison CA, Greedan JE, Paramekanti A, Gaulin BD. Octupolar versus Néel Order in Cubic 5d^{2} Double Perovskites. Phys Rev Lett 2020; 124:087206. [PMID: 32167347 DOI: 10.1103/physrevlett.124.087206] [Citation(s) in RCA: 3] [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] [Received: 09/06/2019] [Accepted: 01/30/2020] [Indexed: 05/13/2023]
Abstract
We report time-of-flight neutron spectroscopy and neutron and x-ray diffraction studies of the 5d^{2} double perovskite magnets, Ba_{2}MOsO_{6} (M=Zn,Mg,Ca). These materials host antiferromagnetically coupled 5d^{2} Os^{6+} ions decorating a face-centered cubic (fcc) lattice and are found to remain cubic down to the lowest temperatures. They all exhibit thermodynamic anomalies consistent with a single phase transition at a temperature T^{*}, and a gapped magnetic excitation spectrum with spectral weight concentrated at wave vectors typical of type-I antiferromagnetic orders. However, while muon spin resonance experiments show clear evidence for time-reversal symmetry breaking below T^{*}, we observe no corresponding magnetic Bragg scattering signal. These results are shown to be consistent with ferro-octupolar symmetry breaking below T^{*}, and are discussed in the context of other 5d double perovskite magnets and theories of exotic orders driven by multipolar interactions.
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Affiliation(s)
- D D Maharaj
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - G Sala
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M B Stone
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E Kermarrec
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France
| | - C Ritter
- Institut Laue-Langevin, Boîte Postale 156, 38042 Grenoble Cédex, France
| | - F Fauth
- CELLS-ALBA Synchrotron, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallès, Barcelona, Spain
| | - C A Marjerrison
- Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1, Canada
| | - J E Greedan
- Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1, Canada
- Department of Chemistry and Chemical Biology, McMaster University, Ontario L8S 4M1, Canada
| | - A Paramekanti
- Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada
| | - B D Gaulin
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
- Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1, Canada
- Canadian Institute for Advanced Research, 661 University Avenue, Toronto, Ontario M5G 1M1, Canada
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14
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Fuhrmann P, Kalisvaart L, Sala G, Scholten E, Stieger M. Clustering of oil droplets in o/w emulsions enhances perception of oil-related sensory attributes. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2019.105215] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Hester G, Nair HS, Reeder T, Yahne DR, DeLazzer TN, Berges L, Ziat D, Neilson JR, Aczel AA, Sala G, Quilliam JA, Ross KA. Novel Strongly Spin-Orbit Coupled Quantum Dimer Magnet: Yb_{2}Si_{2}O_{7}. Phys Rev Lett 2019; 123:027201. [PMID: 31386489 DOI: 10.1103/physrevlett.123.027201] [Citation(s) in RCA: 4] [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] [Received: 10/31/2018] [Indexed: 06/10/2023]
Abstract
The quantum dimer magnet (QDM) is the canonical example of quantum magnetism. The QDM state consists of entangled nearest-neighbor spin dimers and often exhibits a field-induced triplon Bose-Einstein condensate (BEC) phase. We report on a new QDM in the strongly spin-orbit coupled, distorted honeycomb-lattice material Yb_{2}Si_{2}O_{7}. Our single crystal neutron scattering, specific heat, and ultrasound velocity measurements reveal a gapped singlet ground state at zero field with sharp, dispersive excitations. We find a field-induced magnetically ordered phase reminiscent of a BEC phase, with exceptionally low critical fields of H_{c1}∼0.4 and H_{c2}∼1.4 T. Using inelastic neutron scattering in an applied magnetic field we observe a Goldstone mode (gapless to within δE=0.037 meV) that persists throughout the entire field-induced magnetically ordered phase, suggestive of the spontaneous breaking of U(1) symmetry expected for a triplon BEC. However, in contrast to other well-known cases of this phase, the high-field (μ_{0}H≥1.2 T) part of the phase diagram in Yb_{2}Si_{2}O_{7} is interrupted by an unusual regime signaled by a change in the field dependence of the ultrasound velocity and magnetization, as well as the disappearance of a sharp anomaly in the specific heat. These measurements raise the question of how anisotropy in strongly spin-orbit coupled materials modifies the field induced phases of QDMs.
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Affiliation(s)
- Gavin Hester
- Department of Physics, Colorado State University, 200 W. Lake St., Fort Collins, Colorado 80523-1875, USA
| | - H S Nair
- Department of Physics, Colorado State University, 200 W. Lake St., Fort Collins, Colorado 80523-1875, USA
| | - T Reeder
- Department of Physics, Colorado State University, 200 W. Lake St., Fort Collins, Colorado 80523-1875, USA
| | - D R Yahne
- Department of Physics, Colorado State University, 200 W. Lake St., Fort Collins, Colorado 80523-1875, USA
| | - T N DeLazzer
- Department of Physics, Colorado State University, 200 W. Lake St., Fort Collins, Colorado 80523-1875, USA
| | - L Berges
- Institut Quantique and Département de Physique, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec J1K 2R1, Canada
| | - D Ziat
- Institut Quantique and Département de Physique, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec J1K 2R1, Canada
| | - J R Neilson
- Department of Chemistry, Colorado State University, 200 W. Lake St., Fort Collins, Colorado 80523-1872, USA
| | - A A Aczel
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G Sala
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J A Quilliam
- Institut Quantique and Département de Physique, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec J1K 2R1, Canada
| | - K A Ross
- Department of Physics, Colorado State University, 200 W. Lake St., Fort Collins, Colorado 80523-1875, USA
- Quantum Materials Program, Canadian Institute for Advanced Research (CIFAR), Toronto, Ontario M5G 1Z8, Canada
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16
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Wu LS, Nikitin SE, Wang Z, Zhu W, Batista CD, Tsvelik AM, Samarakoon AM, Tennant DA, Brando M, Vasylechko L, Frontzek M, Savici AT, Sala G, Ehlers G, Christianson AD, Lumsden MD, Podlesnyak A. Tomonaga-Luttinger liquid behavior and spinon confinement in YbAlO 3. Nat Commun 2019; 10:698. [PMID: 30741939 PMCID: PMC6370837 DOI: 10.1038/s41467-019-08485-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [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: 06/11/2018] [Accepted: 01/14/2019] [Indexed: 11/09/2022] Open
Abstract
Low dimensional quantum magnets are interesting because of the emerging collective behavior arising from strong quantum fluctuations. The one-dimensional (1D) S = 1/2 Heisenberg antiferromagnet is a paradigmatic example, whose low-energy excitations, known as spinons, carry fractional spin S = 1/2. These fractional modes can be reconfined by the application of a staggered magnetic field. Even though considerable progress has been made in the theoretical understanding of such magnets, experimental realizations of this low-dimensional physics are relatively rare. This is particularly true for rare-earth-based magnets because of the large effective spin anisotropy induced by the combination of strong spin-orbit coupling and crystal field splitting. Here, we demonstrate that the rare-earth perovskite YbAlO3 provides a realization of a quantum spin S = 1/2 chain material exhibiting both quantum critical Tomonaga-Luttinger liquid behavior and spinon confinement-deconfinement transitions in different regions of magnetic field-temperature phase diagram.
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Affiliation(s)
- L S Wu
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
- Department of Physics, Southern University of Science and Technology, 518055, Shenzhen, China.
| | - S E Nikitin
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01069, Dresden, Germany
| | - Z Wang
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN, 37996, USA
| | - W Zhu
- Westlake Institute of Advanced Study, 310024, Hangzhou, P. R. China
- Theoretical Division, T-4 and CNLS, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - C D Batista
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN, 37996, USA
- Shull-Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - A M Tsvelik
- Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - A M Samarakoon
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - D A Tennant
- Shull-Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - M Brando
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187, Dresden, Germany
| | - L Vasylechko
- Lviv Polytechnic National University, Lviv, 79013, Ukraine
| | - M Frontzek
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - A T Savici
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - G Sala
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - G Ehlers
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - A D Christianson
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - M D Lumsden
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - A Podlesnyak
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
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17
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Ferro R, Adamska A, Lattanzio R, Mavrommati I, Edling CE, Arifin SA, Fyffe CA, Sala G, Sacchetto L, Chiorino G, De Laurenzi V, Piantelli M, Sansom OJ, Maffucci T, Falasca M. GPR55 signalling promotes proliferation of pancreatic cancer cells and tumour growth in mice, and its inhibition increases effects of gemcitabine. Oncogene 2018; 37:6368-6382. [PMID: 30061636 DOI: 10.1038/s41388-018-0390-1] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 04/19/2018] [Accepted: 06/02/2018] [Indexed: 12/28/2022]
Abstract
The life expectancy for pancreatic cancer patients has seen no substantial changes in the last 40 years as very few and mostly just palliative treatments are available. As the five years survival rate remains around 5%, the identification of novel pharmacological targets and development of new therapeutic strategies are urgently needed. Here we demonstrate that inhibition of the G protein-coupled receptor GPR55, using genetic and pharmacological approaches, reduces pancreatic cancer cell growth in vitro and in vivo and we propose that this may represent a novel strategy to inhibit pancreatic ductal adenocarcinoma (PDAC) progression. Specifically, we show that genetic ablation of Gpr55 in the KRASWT/G12D/TP53WT/R172H/Pdx1-Cre+/+ (KPC) mouse model of PDAC significantly prolonged survival. Importantly, KPC mice treated with a combination of the GPR55 antagonist Cannabidiol (CBD) and gemcitabine (GEM, one of the most used drugs to treat PDAC), survived nearly three times longer compared to mice treated with vehicle or GEM alone. Mechanistically, knockdown or pharmacologic inhibition of GPR55 reduced anchorage-dependent and independent growth, cell cycle progression, activation of mitogen-activated protein kinase (MAPK) signalling and protein levels of ribonucleotide reductases in PDAC cells. Consistent with this, genetic ablation of Gpr55 reduced proliferation of tumour cells, MAPK signalling and ribonucleotide reductase M1 levels in KPC mice. Combination of CBD and GEM inhibited tumour cell proliferation in KPC mice and it opposed mechanisms involved in development of resistance to GEM in vitro and in vivo. Finally, we demonstrate that the tumour suppressor p53 regulates GPR55 protein expression through modulation of the microRNA miR34b-3p. Our results demonstrate the important role played by GPR55 downstream of p53 in PDAC progression. Moreover our data indicate that combination of CBD and GEM, both currently approved for medical use, might be tested in clinical trials as a novel promising treatment to improve PDAC patients' outcome.
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Affiliation(s)
- R Ferro
- Queen Mary University of London, Barts and The London School of Medicine and Dentistry, Blizard Institute, Centre for Cell Biology and Cutaneous Research, 4 Newark Street, London, E1 2AT, UK
| | - A Adamska
- Metabolic Signalling Group, School of Pharmacy & Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, 6102, Perth, WA, Australia
| | - R Lattanzio
- Dipartimento di Scienze Mediche, Orali e Biotecnologiche, University "G. d'Annunzio" di Chieti-Pescara, Centro Studi sull'Invecchiamento, CeSI-MeT, Chieti, 66100, Italy
| | - I Mavrommati
- Queen Mary University of London, Barts and The London School of Medicine and Dentistry, Blizard Institute, Centre for Cell Biology and Cutaneous Research, 4 Newark Street, London, E1 2AT, UK
| | - C E Edling
- Queen Mary University of London, Barts and The London School of Medicine and Dentistry, Blizard Institute, Centre for Cell Biology and Cutaneous Research, 4 Newark Street, London, E1 2AT, UK
| | - S A Arifin
- Queen Mary University of London, Barts and The London School of Medicine and Dentistry, Blizard Institute, Centre for Cell Biology and Cutaneous Research, 4 Newark Street, London, E1 2AT, UK
| | - C A Fyffe
- Queen Mary University of London, Barts and The London School of Medicine and Dentistry, Blizard Institute, Centre for Cell Biology and Cutaneous Research, 4 Newark Street, London, E1 2AT, UK
| | - G Sala
- Dipartimento di Scienze Mediche, Orali e Biotecnologiche, University "G. d'Annunzio" di Chieti-Pescara, Centro Studi sull'Invecchiamento, CeSI-MeT, Chieti, 66100, Italy
| | - L Sacchetto
- Cancer Genomics Laboratory, Fondazione Edo and Elvo Tempia, Biella, Italy
| | - G Chiorino
- Cancer Genomics Laboratory, Fondazione Edo and Elvo Tempia, Biella, Italy
| | - V De Laurenzi
- Metabolic Signalling Group, School of Pharmacy & Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, 6102, Perth, WA, Australia
- Dipartimento di Scienze Mediche, Orali e Biotecnologiche, University "G. d'Annunzio" di Chieti-Pescara, Centro Studi sull'Invecchiamento, CeSI-MeT, Chieti, 66100, Italy
| | - M Piantelli
- Dipartimento di Scienze Mediche, Orali e Biotecnologiche, University "G. d'Annunzio" di Chieti-Pescara, Centro Studi sull'Invecchiamento, CeSI-MeT, Chieti, 66100, Italy
| | - O J Sansom
- Cancer Research UK Beatson Institute, Glasgow, G61 1BD, UK
| | - T Maffucci
- Queen Mary University of London, Barts and The London School of Medicine and Dentistry, Blizard Institute, Centre for Cell Biology and Cutaneous Research, 4 Newark Street, London, E1 2AT, UK
| | - M Falasca
- Queen Mary University of London, Barts and The London School of Medicine and Dentistry, Blizard Institute, Centre for Cell Biology and Cutaneous Research, 4 Newark Street, London, E1 2AT, UK.
- Metabolic Signalling Group, School of Pharmacy & Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, 6102, Perth, WA, Australia.
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18
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Damiani V, Falvo E, Pitea M, Fracasso G, Rossi C, Sala G, De Laurenzi V, Ceci P. PO-207 Ferritin-engineered nanoparticles as targeted drug delivery system for cancer treatment. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.725] [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: 11/04/2022] Open
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19
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Barbera S, Tarantola M, Sala G, Nebbia C. Canonical discriminant analysis and meat quality analysis as complementary tools to detect the illicit use of dexamethasone as a growth promoter in Friesian bulls. Vet J 2018; 235:54-59. [PMID: 29704939 DOI: 10.1016/j.tvjl.2018.03.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 03/11/2018] [Accepted: 03/17/2018] [Indexed: 10/17/2022]
Abstract
A screening method based on meat quality parameters and production traits for detecting the effects of illegal administration of dexamethasone in Friesian bulls was assessed. Twenty finishing bulls were divided into an untreated control group (n=8) and two treatment groups receiving dexamethasone orally at dosages of 1.4 (n=6) or 0.7 (n=6)mg per head per day for 60 days. The animals were slaughtered 26days after cessation of treatment. Thirty-six parameters were measured on live animals, carcasses and samples of the longissimus thoracis muscle. The production traits were similar between groups, but there were significant differences in meat quality between treatment groups. The higher dosage of dexamethasone improved meat tenderness, while the lower dosage resulted in more saturated red meat, with increased meat cooking shrinkage and cooking loss. The use of a portable 'electronic nose' as a screening tool was not successful in discriminating between treated and untreated meat. These results indicate that a multivariable approach using canonical discriminant analysis may be a complementary tool to identify meat from animals illegally treated with dexamethasone, based on several parameters (meat flavour, cooking and thawing loss, tenderness, colour and live weight gain), which are part of the normal analysis of meat quality.
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Affiliation(s)
- S Barbera
- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università di Torino, Largo Paolo Braccini, 2 - 10095 Grugliasco, Italy.
| | - M Tarantola
- Dipartimento di Scienze Veterinarie, Università di Torino, Largo Paolo Braccini, 2 - 10095 Grugliasco, Italy
| | - G Sala
- KWS Italia, Via Secondo Casadei, 8-47122 Forlì, Italy
| | - C Nebbia
- Dipartimento di Scienze Veterinarie, Università di Torino, Largo Paolo Braccini, 2 - 10095 Grugliasco, Italy
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Chen M, Feijen S, Sala G, Meinders M, van Valenberg H, van Hooijdonk A, van der Linden E. Foam stabilized by large casein micelle aggregates: The effect of aggregate number in foam lamella. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2017.08.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Boccardo A, Biffani S, Belloli A, Biscarini F, Sala G, Pravettoni D. Risk factors associated with case fatality in 225 diarrhoeic calves: A retrospective study. Vet J 2017; 228:38-40. [PMID: 29153106 DOI: 10.1016/j.tvjl.2017.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 05/23/2017] [Accepted: 10/17/2017] [Indexed: 11/18/2022]
Abstract
The aim of this retrospective study was to identify the major risk factors associated with case fatality in diarrhoeic calves undergoing a standard therapeutic protocol. Clinical and laboratory findings were reviewed in 225 Holstein Friesian diarrhoeic calves over a 2 year period. Calves were treated according to a fluid therapy protocol using an oral electrolyte solution or an IV infusion. After therapy, 159 calves were discharged in a healthy state, whereas 66 calves died. Logistic regression analysis showed that serum total protein (STP) concentration (odds ratio, OR, 0.51; 95% confidence interval, CI 0.31-0.84; P<0.01) and the strength of suckle reflex (OR 4.83; CI 1.17-19.88; P<0.05) were the major risk factors associated with case fatality in diarrhoeic calves. These results could help to distinguish between diarrhoeic calves with a good prognosis and those with a major risk of treatment failure.
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Affiliation(s)
- A Boccardo
- Department of Veterinary Medicine, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italy; Clinic for Ruminants and Swine, Large Animal Veterinary Teaching Hospital, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy.
| | - S Biffani
- Institute of Agricultural Biology and Biotechnology IBBA-CNR, Via Einstein Loc. Cascina Codazza, 26900 Lodi, Italy
| | - A Belloli
- Department of Veterinary Medicine, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italy; Clinic for Ruminants and Swine, Large Animal Veterinary Teaching Hospital, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy
| | - F Biscarini
- Institute of Agricultural Biology and Biotechnology IBBA-CNR, Via Einstein Loc. Cascina Codazza, 26900 Lodi, Italy; Department of Bioinformatics and Biostatistics, PTP Science Park, Via Einstein Loc. Cascina Codazza, 26900 Lodi, Italy
| | - G Sala
- Department of Veterinary Medicine, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italy; Clinic for Ruminants and Swine, Large Animal Veterinary Teaching Hospital, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy
| | - D Pravettoni
- Department of Veterinary Medicine, Università degli Studi di Milano, Via Celoria 10, 20133 Milano, Italy; Clinic for Ruminants and Swine, Large Animal Veterinary Teaching Hospital, Università degli Studi di Milano, Via dell'Università 6, 26900 Lodi, Italy
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Faccini S, Barbieri I, Gilioli A, Sala G, Gibelli LR, Moreno A, Sacchi C, Rosignoli C, Franzini G, Nigrelli A. Detection and genetic characterization of Porcine circovirus type 3 in Italy. Transbound Emerg Dis 2017; 64:1661-1664. [DOI: 10.1111/tbed.12714] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Indexed: 11/29/2022]
Affiliation(s)
- S. Faccini
- Diagnostic Unit of Mantova; IZSLER; Mantova (MN) Italy
| | | | - A. Gilioli
- Medical Biotechnology; University of Brescia; Brescia (BS) Italy
| | - G. Sala
- Diagnostic Unit of Binago; IZSLER; Binago (CO) Italy
| | | | - A. Moreno
- Virology Unit; IZSLER; Brescia (BS) Italy
| | - C. Sacchi
- Diagnostic Unit of Binago; IZSLER; Binago (CO) Italy
| | - C. Rosignoli
- Diagnostic Unit of Mantova; IZSLER; Mantova (MN) Italy
| | - G. Franzini
- Diagnostic Unit of Mantova; IZSLER; Mantova (MN) Italy
| | - A. Nigrelli
- Diagnostic Unit of Mantova; IZSLER; Mantova (MN) Italy
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Tereanu C, Sampietro G, Sarnataro F, Mazzoleni G, Pesenti B, Sala L, Cecchetti R, Arvati M, Brioschi D, Viscardi M, Prati C, Sala G, Barbaglio G. Exploring patient safety culture in preventive medicine settings: an experience from Northern Italy. J Prev Med Hyg 2017; 58:E121-E129. [PMID: 28900352 PMCID: PMC5584081] [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] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
INTRODUCTION Patient safety and quality in healthcare are inseparable. Examining patient safety culture in staff members contributes to further develop quality in healthcare. In Italy there has been some experience in assessing patient safety culture in staff working in hospital. In this pilot study we explored patient safety culture in public health staff working in Italian Local Health Authorities. METHODS We carried out a descriptive cross sectional study in four Italian territorial Prevention facilities in Northern Italy. We administrated an adapted Italian version of the US Hospital Survey of Patient Safety Culture to all the staff within these facilities. The survey consisted of 10 dimensions based on 33 items, according to the results of a previous psychometric validation. RESULTS Seventy per cent of the staff responded to the survey (N = 479). Overall, six out of the 10 dimensions exhibited composite scores of positive response frequency for patient safety culture below 50%. While "communication openness" (65%) was the most developed factor, "teamwork across Units" (37%) was the least developed. The work areas with the highest composite scores were Management and the Public Health Laboratory, while in terms of professional categories, Physicians had the highest scores. Patient safety culture in the staff participating in this study was lower than in hospital staff. DISCUSSION Our descriptive cross sectional study is the first to be carried out in Preventive medicine settings in Italy. It has clearly indicated the need of improvement. Consequently, several interventions with this aim have been implemented.
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Affiliation(s)
- C. Tereanu
- Department of Hygiene and Prevention, Agenzia di Tutela della Salute Bergamo, Italy;,Correspondence: Carmen Tereanu, Department of Hygiene and Prevention, Agenzia di Tutela della Salute Bergamo, via Borgo Palazzo 130, 24125 Bergamo, Italy - E-mail:
| | - G. Sampietro
- Epidemiology Service, Agenzia di Tutela della Salute Bergamo, Italy
| | - F. Sarnataro
- Department of Hygiene and Prevention, Agenzia di Tutela della Salute Bergamo, Italy
| | - G. Mazzoleni
- Azienda Socio-Sanitaria Territoriale, Bergamo Est, Italy
| | - B. Pesenti
- Department of Hygiene and Prevention, Agenzia di Tutela della Salute Bergamo, Italy
| | - L.C. Sala
- Department of Prevention, Local Health Authority of Biella, Italy
| | - R. Cecchetti
- Department of Medical Prevention, Agenzia di Tutela della Salute Brianza, Italy
| | - M. Arvati
- Department of Medical Prevention, Agenzia di Tutela della Salute Val Padana, Italy
| | - D. Brioschi
- Department of Teaching and Communication, Local Health Authority of Biella, Italy
| | - M. Viscardi
- Department of Medical Prevention, Agenzia di Tutela della Salute Brianza, Italy
| | - C. Prati
- Department of Medical Prevention, Agenzia di Tutela della Salute Val Padana, Italy
| | - G. Sala
- Research and Evaluation Officer, COOPI - Cooperazione Internazionale, Niamey, Niger
| | - G.G. Barbaglio
- MD, Medical Management, Agenzia di Tutela della Salute Bergamo, Italy
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24
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Chen M, Bleeker R, Sala G, Meinders M, van Valenberg H, van Hooijdonk A, van der Linden E. Particle size determines foam stability of casein micelle dispersions. Int Dairy J 2016. [DOI: 10.1016/j.idairyj.2016.01.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Masoero G, Sala G, Meineri G, Peiretti PG. NIRS discrimination of broiler rabbits fed with increasing levels of false flax (Camelina sativa L.) seeds in relationship to the fatty acid profiles. Italian Journal of Animal Science 2016. [DOI: 10.4081/ijas.2007.1s.777] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- G. Masoero
- Istituto Sperimentale per la Zootecnia, Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Torino, Italy
| | - G. Sala
- Istituto Sperimentale per la Zootecnia, Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Torino, Italy
| | - G. Meineri
- Dipartimento di Produzioni Animali. Università di Torino, Italy
| | - P. G. Peiretti
- Istituto di Scienze delle Produzioni Alimentari. Consiglio Nazionale delle Ricerche, Torino, Italy
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Masoero G, Sala G, Contarini G, Moioli BM. Efficiency of different spectroscopies and the Electronic Nose techniques for the characterization of milk. Italian Journal of Animal Science 2016. [DOI: 10.4081/ijas.2007.1s.450] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- G. Masoero
- Istituto Sperimentale per la Zootecnia, Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Torino, Italy
| | - G. Sala
- Istituto Sperimentale per la Zootecnia, Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Torino, Italy
| | - G. Contarini
- Istituto Sperimentale Lattiero Caseario, Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Lodi, Italy
| | - B. M. Moioli
- Istituto Sperimentale per la Zootecnia, Consiglio per la Ricerca e la Sperimentazione in Agricoltura, Torino, Italy
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Herrero R, Domínguez C, Askins S, Antón I, Sala G. Methodology of quantifying curvature of Fresnel lenses and its effect on CPV module performance. Opt Express 2015; 23:A1030-A1039. [PMID: 26406733 DOI: 10.1364/oe.23.0a1030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Fresnel lenses used as primary optics in concentrating photovoltaic modules may show warping produced by lens manufacturing or module assembly (e.g., stress during molding or weight load) or due to stress during operation (e.g., mismatch of thermal expansion between different materials). To quantify this problem, a simple method called "checkerboard method" is presented. The proposed method identifies shape errors on the front surface of primary lenses by analyzing the Fresnel reflections. This paper also deals with the quantification of the effects these curvatures have on their optical performance and on the electrical performance of concentrating modules incorporating them. This method can be used to perform quality control of Fresnel lenses in scenarios of high volume production.
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28
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Carone D, Librizzi L, Cattalini A, Sala G, Conti E, Cuccione E, Versace A, Cai R, Monza L, de Curtis M, Ferrarese C, Beretta S. Pravastatin acute neuroprotective effects depend on blood brain barrier integrity in experimental cerebral ischemia. Brain Res 2015; 1615:31-41. [DOI: 10.1016/j.brainres.2015.04.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 04/11/2015] [Accepted: 04/14/2015] [Indexed: 12/20/2022]
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Grasselli J, Elez E, Sauri T, Macarulla T, Alsina M, Capdevila J, Argiles G, Hierro C, Salva F, Sanz-García E, Racca F, Azaro A, Braña I, Ochoa de Olza M, Grau I, Sala G, Rodon J, Salazar R, Tabernero J. PD-016 Developmental therapeutics activity portrait in metastatic colorectal cancer (mCRC): Vall d'Hebron Institute of Oncology Program. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv234.15] [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: 11/13/2022] Open
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Sala G, Prasetyanti P, Barcaroli D, Volpe S, Capone E, Rossi C, Carollo R, Todaro M, Stassi G, Medema J, lacobelli S, de Laurenzi V. 505 The anti-ErbB3 antibody, EV20, counteracts vemurafenib resistance in BRAF-mutated colorectal cancer stem cells. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70631-8] [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: 10/24/2022]
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31
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Sala G, Gutmann MJ, Prabhakaran D, Pomaranski D, Mitchelitis C, Kycia JB, Porter DG, Castelnovo C, Goff JP. Vacancy defects and monopole dynamics in oxygen-deficient pyrochlores. Nat Mater 2014; 13:488-493. [PMID: 24728463 DOI: 10.1038/nmat3924] [Citation(s) in RCA: 30] [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: 07/05/2013] [Accepted: 02/24/2014] [Indexed: 06/03/2023]
Abstract
The idea of magnetic monopoles in spin ice has enjoyed much success at intermediate temperatures, but at low temperatures a description in terms of monopole dynamics alone is insufficient. Recently, numerical simulations were used to argue that magnetic impurities account for this discrepancy by introducing a magnetic equivalent of residual resistance in the system. Here we propose that oxygen deficiency is the leading cause of magnetic impurities in as-grown samples, and we determine the defect structure and magnetism in Y2Ti2O7-δ using diffuse neutron scattering and magnetization measurements. These defects are eliminated by oxygen annealing. The introduction of oxygen vacancies causes Ti(4+) to transform to magnetic Ti(3+) with quenched orbital magnetism, but the concentration is anomalously low. In the spin-ice material Dy2Ti2O7 we find that the same oxygen-vacancy defects suppress moments on neighbouring rare-earth sites, and that these magnetic distortions markedly slow down the long-time monopole dynamics at sub-Kelvin temperatures.
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Affiliation(s)
- G Sala
- Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, UK
| | - M J Gutmann
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK
| | - D Prabhakaran
- Department of Physics, University of Oxford, Oxford OX1 3PU, UK
| | - D Pomaranski
- Department of Physics and Astronomy and Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, Ontario N2L3G1, Canada
| | - C Mitchelitis
- Department of Physics and Astronomy and Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, Ontario N2L3G1, Canada
| | - J B Kycia
- Department of Physics and Astronomy and Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, Ontario N2L3G1, Canada
| | - D G Porter
- Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, UK
| | - C Castelnovo
- Theory of Condensed Matter group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
| | - J P Goff
- Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, UK
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Herrero R, Domínguez C, Askins S, Antón I, Sala G. Luminescence inverse method For CPV optical characterization. Opt Express 2013; 21 Suppl 6:A1028-A1034. [PMID: 24514923 DOI: 10.1364/oe.21.0a1028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The luminescence inverse method may be used to optically characterize a concentrator photovoltaic module. With this method, the module angular transmission is obtained by evaluating the light emission of a forward biased module. The influence of the emission of the cell when measuring the angular transmission is evaluated, and the process of building a global angular transmission from the set of individual optics-cell unit functions is explained. A case study of a module composed by several optics-cell units is presented. In order to validate the proposed measurement, results for five different CPV technologies are compared for both direct methods (i.e., solar simulator) and indirect methods (i.e., Luminescence inverse method).
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Tremolizzo L, Sala G, Zoia CP, Ferrarese C. Assessing glutamatergic function and dysfunction in peripheral tissues. Curr Med Chem 2012; 19:1310-5. [PMID: 22304709 DOI: 10.2174/092986712799462702] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2011] [Revised: 11/13/2011] [Accepted: 11/15/2011] [Indexed: 11/22/2022]
Abstract
Glutamate is the major mediator of excitatory signaling in the mammalian central nervous system (CNS) and it has recently been described to have a central role in the transduction of sensory input in the peripheral nervous system (PNS), too. However, functional glutamatergic systems are expressed by peripheral non-neural tissues as well, such as heart, kidney, lungs, ovary, testis, blood and skin. Interestingly, glutamatergic alterations have been repeatedly described in these tissues in various neuropsychiatric diseases. Here we will review evidence suggesting that glutamate measurements obtained from sampling ex vivo peripheral cells can permit the assessment of the dynamics of glutamate release, uptake, receptor-mediated signaling, synthesis and degradation, and mirror homologous dysfunctions operative within the CNS in each single patient. Among all the available cell types we will focus on leukocytes, platelets and fibroblasts that can be easily obtained from patients multiple times without concerns related to post-mortem changes. Finally, we will briefly review another possibility, offered by testing plasma (and CSF) glutamate levels, allowing the indirect investigation of glutamate-mediated crosstalk between central and peripheral compartments. Technical pitfalls of these biomarkers will be contextually emphasized.
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Affiliation(s)
- L Tremolizzo
- Department of Neuroscience and Biomedical Technologies, University of Milano-Bicocca, via Cardore 48-20900 Monza (MI), Italy.
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Sala G, Castelnovo C, Moessner R, Sondhi SL, Kitagawa K, Takigawa M, Higashinaka R, Maeno Y. Magnetic Coulomb fields of monopoles in spin ice and their signatures in the internal field distribution. Phys Rev Lett 2012; 108:217203. [PMID: 23003295 DOI: 10.1103/physrevlett.108.217203] [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: 12/15/2011] [Indexed: 06/01/2023]
Abstract
Fractionalization-the breaking up of an apparently indivisible microscopic degree of freedom-is one of the most counterintuitive phenomena in many-body physics. Here we study its most fundamental manifestation in spin ice, the only known fractionalized magnetic compound in 3D: we directly visualize the 1/r(2) magnetic Coulomb field of monopoles that emerge as the atomic magnetic dipoles fractionalize. We analyze the internal magnetic field distribution, relevant for local experimental probes. In particular, we present new zero-field NMR measurements that exhibit excellent agreement with the calculated line shapes, noting that this experimental technique can in principle measure directly the monopole density in spin ice. The distribution of field strengths is captured by a simple analytical form that exhibits a low density of low-field sites-in apparent disagreement with reported muon spin rotation results. Counterintuitively, the density of low-field locations decreases as the local ferromagnetic correlations imposed by the ice rules weaken.
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Affiliation(s)
- G Sala
- South East Physics Network and Hubbard Theory Consortium, Department of Physics, Royal Holloway University of London, Egham, United Kingdom
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Edward S, Moore H, Durrant C, Willemetz A, Sala G, Chrétien D, Ghidoni R, Rötig A, Thelestam M, Katz A, Ermonval M. Defects in galactose metabolism and glycoconjugate biosynthesis in UDP‐glucose pyrophosphorylase‐deficient fibroblasts are reversed by supplementing the cell growth medium with galactose. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.lb234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Stuart Edward
- INSERM U773ParisFrance
- U781, INSERMParisFrance
- Université Paris 7 Denis DiderotParisFrance
- San Paolo University HospitalSchool of MedicineUniversity of MilanMilanItaly
- Hôpital Necker-Enfants MaladesParisFrance
| | - Hanson Moore
- INSERM U773ParisFrance
- Université Paris 7 Denis DiderotParisFrance
| | | | | | - Giusy Sala
- San Paolo University HospitalSchool of MedicineUniversity of MilanMilanItaly
| | | | - Riccardo Ghidoni
- San Paolo University HospitalSchool of MedicineUniversity of MilanMilanItaly
| | - Agnès Rötig
- U781, INSERMParisFrance
- Hôpital Necker-Enfants MaladesParisFrance
| | - Monica Thelestam
- Department of Cell and Molecular BiologyKarolinska InstitutetStockholmSweden
| | - Abram Katz
- Department of Physiology and PharmacologyKarolinska InstitutetStockholmSweden
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lacobelli S, Sala G, Traini S, D'Egidio M, Di Risio A, Tinari N, Natali R, Muraro R. 1226 POSTER An ErbB-3 Antibody, MP-RM-1, Inhibits Tumour Growth by Blocking Ligand-dependent and Independent Activation of ErbB-3/Akt Signaling. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)70838-3] [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: 11/27/2022]
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Sala G, Traini S, D'Egidio M, Vianale G, Rossi C, Piccolo E, Lattanzio R, Piantelli M, Tinari N, Natali PG, Muraro R, Iacobelli S. An ErbB-3 antibody, MP-RM-1, inhibits tumor growth by blocking ligand-dependent and independent activation of ErbB-3/Akt signaling. Oncogene 2011; 31:1275-86. [PMID: 21822299 DOI: 10.1038/onc.2011.322] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The ErbB receptors, such as ErbB-1 and ErbB-2, have been intensely pursued as targets for cancer therapeutics. Although initially efficacious in a subset of patients, drugs targeting these receptors led invariably to resistance, which is often associated with reactivation of the ErbB-3-PI3K-Akt signaling. This may be overcome by an ErbB-3 ligand that abrogates receptor-mediated signaling. Toward this end, we have generated a mouse monoclonal antibody, MP-RM-1, against the extracellular domain (ECD) of ErbB-3 receptor. Assessment of human tumor cell lines, as well as early passage tumor cells revealed that MP-RM-1 effectively inhibited both NRG-1β-dependent and -independent ErbB-3 activation. The antagonizing effect of MP-RM-1 was of non-competitive type, as binding of [(125)I]-labeled NRG-1β to ErbB-3 was not influenced by the antibody. MP-RM-1 treatment led, in most instances, to decreased ErbB-3 expression. In addition, MP-RM-1 was able to inhibit the colony formation ability of tumor cells and tumor growth in two human tumor xenograft nude mouse models. Treatment with the antibody was associated with a decreased ErbB-3 and Akt phosphorylation and ErbB-3 expression in the excised tumor tissue. Collectively, these results indicate that MP-RM-1 has the potential to interfere with signaling by ErbB-3 and reinforce the notion that ErbB-3 could be a key target in cancer-drug design.
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Affiliation(s)
- G Sala
- MediaPharma s.r.l., Chieti, Italy.
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Gottlieb T, Phan T, Cheong EYL, Sala G, Siarakas S, Pinto A. Reusable tourniquets. An underestimated means for patient transfer of multi-resistant bacteria. BMC Proc 2011. [PMCID: PMC3239770 DOI: 10.1186/1753-6561-5-s6-p38] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Iacobelli S, Sala G, Traini S, D'Egidio M, Vianale G, Rossi C, Piccolo E, Lattanzio R, Piantelli M, Tinari N, Gildetti S, D'Addario D, Giampietro J, Natali PG, Muraro R. Effects of an ErbB-3 antibody, MP-RM-1, on tumor growth and ligand-dependent and -independent activation of ErbB-3/akt signaling. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e13538] [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: 11/20/2022] Open
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Beretta S, Pastori C, Sala G, Piazza F, Ferrarese C, Cattalini A, de Curtis M, Librizzi L. Acute lipophilicity-dependent effect of intravascular simvastatin in the early phase of focal cerebral ischemia. Neuropharmacology 2011; 60:878-85. [PMID: 21236270 DOI: 10.1016/j.neuropharm.2011.01.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Revised: 11/26/2010] [Accepted: 01/04/2011] [Indexed: 11/26/2022]
Abstract
The acute effects of simvastatin lactone (lipophilic) and simvastatin acid (hydrophilic) on transient focal ischemia were assessed using the isolated guinea pig brain maintained in vitro by arterial perfusion. This new model of cerebral ischemia allows the assessment of the very early phase of the ischemic process, with the functional preservation of the vascular and neuronal compartments and the blood-brain barrier (bbb). The middle cerebral artery was transiently tied for 30 min followed by reperfusion for 60 min. Statins (nanomolar doses) were administered by intravascular continuous infusion starting 60 min before ischemia induction. Brain cortical activity and arterial vascular tone were continuously recorded. At the end of the experiment immunoreactivity for microtubule-associated protein 2 (MAP-2), expression of survival kinases (ERK and Akt) and total anti-oxidant capacity were assayed. Brains treated with simvastatin lactone showed i) reduced amplitude and delayed onset of ischemic depressions, ii) preservation of MAP-2 immunoreactivity, iii) activation of ERK signaling in the ischemic hemisphere and iv) increase in whole-brain anti-oxidant capacity. Treatment with the bbb-impermeable simvastatin acid was ineffective on the above-mentioned parameters. Vascular resistance recordings and Akt signaling were unchanged by any statin treatment. Our findings suggest that intravascular-delivered simvastatin exerts an acute lipophilicity-dependent protective effect in the early phase of cerebral ischemia.
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Affiliation(s)
- S Beretta
- Department of Neuroscience and Biomedical Technologies, University of Milano Bicocca, Monza, Italy
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Herrero R, Domínguez C, Askins S, Antón I, Sala G. Two-dimensional angular transmission characterization of CPV modules. Opt Express 2010; 18 Suppl 4:A499-A505. [PMID: 21165081 DOI: 10.1364/oe.18.00a499] [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
This paper proposes a fast method to characterize the two-dimensional angular transmission function of a concentrator photovoltaic (CPV) system. The so-called inverse method, which has been used in the past for the characterization of small optical components, has been adapted to large-area CPV modules. In the inverse method, the receiver cell is forward biased to produce a Lambertian light emission, which reveals the reverse optical path of the optics. Using a large-area collimator mirror, the light beam exiting the optics is projected on a Lambertian screen to create a spatially resolved image of the angular transmission function. An image is then obtained using a CCD camera. To validate this method, the angular transmission functions of a real CPV module have been measured by both direct illumination (flash CPV simulator and sunlight) and the inverse method, and the comparison shows good agreement.
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Affiliation(s)
- R Herrero
- Instituto de Energía Solar, E.T.S Ingenieros de Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria 28040, Madrid, Spain.
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Zoppellari F, Rosso F, Sala G, Chiatarra W, Malusà E, Bardi L. Use of Rhizosphere Beneficial Microrganisms Inocula to Improve Water Efficiency in Piedmont Maize Crop. J Biotechnol 2010. [DOI: 10.1016/j.jbiotec.2010.09.753] [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: 10/18/2022]
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Oggioni C, Fontana G, Pavan A, Gramegna M, Ferretti V, Piatti A, Edefonti V, Tunnesi S, Sala G, Pontello M. [Investigation of potential risk factors for Salmonella enterica subsp enterica serotype Napoli: a nested case-control study in Lombardia region]. Ann Ig 2010; 22:327-335. [PMID: 21425643] [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: 05/30/2023]
Abstract
Enter-net surveillance system has detected the re-emergence of Salmonella enterica subsp enterica serotype Napoli (S. Napoli) since 2002. Preliminary data show that food vehicle could not be the only one implicated in the transmission of this serotype. A nested case-control study has been conducted using data form a prospective cohort: for each salmonellosis notification in Lombardia from May 2004 to December 2005 an ad hoc epidemiological investigation has been performed. Cases have been defined as subjects affected by salmonellosis with a positive faecal sample for Salmonella serotype Napoli and controls as subjects affected by salmonellosis with a positive faecal sample for Salmonella serotype not Napoli. Among 2185 salmonellosis notifications collected by 12 of 15 Local Health Authorities, we identified 67 cases and 867 controls. Infection due to S. Napoli were significantly more common among subjects with exposure to surface water (adjusted Odds Ratio (OR) = 3,82; 95% Confidence Interval (C.I.)=1,03-14,19), to domestic animals (adjusted OR = 3,22; 95% C.I. = 1,28-8,10) and among person who practice activities connected to surface water (adjusted OR 3,88; 95% C.I.=1,15-13,05) compared to subjects not exposed to these factors. Hyperendemia of S. Napoli could be attributable to an animal reservoir not yet identified: surface water contamination may be a direct (waterborne infection) or indirect (foodborne infection) vehicle for transmission of S. Napoli. behaviour. Regarding the relations of the neuroendocrine parameters and driving behaviour, positive correlations were observed between dopamine levels and frequency of driving violations while a negative relationship was found between adrenaline levels and frequency of driving errors. In conclusion the identification of psycho-physiological variables related to driving risky behaviour might be a useful instrument to design traffic safety programs tailored to high risk subjects.
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Affiliation(s)
- C Oggioni
- Dipartimento di Sanità Pubblica-Microbiologia-Virologia, Università degli Studi di Milano
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Caretti A, Bianciardi P, Sala G, Terruzzi C, Lucchina F, Samaja M. Supplementation of Creatine and Ribose Prevents Apoptosis in Ischemic Cardiomyocytes. Cell Physiol Biochem 2010; 26:831-8. [DOI: 10.1159/000323992] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2010] [Indexed: 11/19/2022] Open
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Tremolizzo L, Rodriguez-Menendez V, Sala G, Di Francesco JC, Ferrarese C. Valproate and HDAC Inhibition: A new epigenetic strategy to mitigate phenotypic severity in ALS? ACTA ACUST UNITED AC 2009; 6:185-6. [PMID: 16183561 DOI: 10.1080/14660820510033614] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- L Tremolizzo
- Department of Neuroscience, University of Milano-Bicocca, Monza, Italy
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Victoria M, Domínguez C, Antón I, Sala G. Comparative analysis of different secondary optical elements for aspheric primary lenses. Opt Express 2009; 17:6487-6492. [PMID: 19365473 DOI: 10.1364/oe.17.006487] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The performance of different reflexive and refractive secondaries optimized for the same primary lens is studied by using ray-tracing simulation. Different solutions are approached according to materials and manufacturing processes currently available in the market, which can be potentially cost-effective for concentrator photovoltaic (CPV) modules. They are compared in terms of system optical efficiency and acceptance angle. In addition, irradiance distribution over the cell is also studied.
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Affiliation(s)
- M Victoria
- Instituto de Energa Solar, Universidad Politécnica de Madrid, Ciudad Universitaria 28040, Madrid, Spain.
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Sala G, Dituri F, Raimondi C, Previdi S, Maffucci T, Mazzoletti M, Rossi C, Iezzi M, Lattanzio R, Piantelli M, Iacobelli S, Broggini M, Falasca M. Phospholipase C 1 Is Required for Metastasis Development and Progression. Cancer Res 2008; 68:10187-96. [DOI: 10.1158/0008-5472.can-08-1181] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Stefanescu A, Kanbach G, Słowikowska A, Greiner J, McBreen S, Sala G. Very fast optical flaring from a possible new Galactic magnetar. Nature 2008; 455:503-5. [PMID: 18818651 DOI: 10.1038/nature07308] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2008] [Accepted: 07/28/2008] [Indexed: 11/09/2022]
Abstract
Highly luminous rapid flares are characteristic of processes around compact objects like white dwarfs, neutron stars and black holes. In the high-energy regime of X-rays and gamma-rays, outbursts with variabilities on timescales of seconds or less are routinely observed, for example in gamma-ray bursts or soft gamma-ray repeaters. At optical wavelengths, flaring activity on such timescales has not been observed, other than from the prompt phase of one exceptional gamma-ray burst. This is mostly due to the fact that outbursts with strong, fast flaring are usually discovered in the high-energy regime; most optical follow-up observations of such transients use instruments with integration times exceeding tens of seconds, which are therefore unable to resolve fast variability. Here we show the observation of extremely bright and rapid optical flaring in the Galactic transient SWIFT J195509.6+261406. Our optical light curves are phenomenologically similar to high-energy light curves of soft gamma-ray repeaters and anomalous X-ray pulsars, which are thought to be neutron stars with extremely high magnetic fields (magnetars). This suggests that similar processes are in operation, but with strong emission in the optical, unlike in the case of other known magnetars.
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Affiliation(s)
- A Stefanescu
- Max-Planck-Institute for Extraterrestrial Physics, PO Box 1312, 85741 Garching, Germany.
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Cedrés Pérez S, Prat A, Felip E, Peralta S, Perez J, del Campo J, Sala G, Andreu J, Pallisa E, Baselga J. Cutaneous rash as a surrogate marker of time to tumor progression (TTP) with erlotinib in previously treated advanced non- small cell lung cancer (NSCLC). J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.19125] [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: 11/20/2022] Open
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