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Pistoia F, Sanguinetti S, Zaottini F, Picasso R, Macciò M, Martinoli C. High-pressure injection injury of the hand: Clinical usefulness of ultrasound as an early diagnostic tool. J Clin Ultrasound 2023; 51:876-878. [PMID: 37025024 DOI: 10.1002/jcu.23464] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 03/23/2023] [Accepted: 03/28/2023] [Indexed: 06/02/2023]
Abstract
High-pressure injection injuries of the hand are uncommon accidents with potentially catastrophic complications. We present a case of a 49-years-old male with a high-pressure injection of motor oil in his left hand. Ultrasound accurately demonstrated soft tissue infiltration and late complications, playing a fundamental role in the treatment choice.
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Affiliation(s)
- Federico Pistoia
- Department of Experimental Medicine (DIMES), University of Genova, Genoa, Italy
| | - Sara Sanguinetti
- Department of Experimental Medicine (DIMES), University of Genova, Genoa, Italy
| | | | | | - Marta Macciò
- Department of Health Science (DISSAL), Università di Genova, Genoa, Italy
| | - Carlo Martinoli
- IRCCS Ospedale Policlinico San Martino, Genoa, Italy
- Department of Health Science (DISSAL), Università di Genova, Genoa, Italy
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Zaottini F, Picasso R, Pistoia F, Pansecchi M, Tovt L, Macciò M, Sanguinetti S, Martinoli C. Imaging of Anatomical Variants Around the Wrist and Hand. Semin Musculoskelet Radiol 2023; 27:169-181. [PMID: 37011618 DOI: 10.1055/s-0043-1761953] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
Wrist and hand anatomy may present several clinically relevant variants that involve bones, muscles, tendons, and nerves. Thorough knowledge of these abnormalities and their appearance in imaging studies is useful for proper management. In particular, it is necessary to differentiate the incidental findings that do not represent a trigger for a specific syndrome from those anomalies causing symptoms and functional impairment. This review reports the most common anatomical variants encountered in clinical practice and briefly discusses their embryogenesis, related clinical syndrome if present, and their appearance using different imaging techniques. The information each diagnostic study (ultrasonography, radiographs, computed tomography, and magnetic resonance imaging) may provide is described for each condition.
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Affiliation(s)
- Federico Zaottini
- Department of Radiology, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Riccardo Picasso
- Department of Radiology, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
| | - Federico Pistoia
- Department of Experimental Medicine (DIMES), University of Genoa, Genoa, Italy
| | - Michelle Pansecchi
- Department of Health Sciences (DISSAL), University of Genoa, Genoa, Italy
| | - Luca Tovt
- Department of Health Sciences (DISSAL), University of Genoa, Genoa, Italy
| | - Marta Macciò
- Department of Health Sciences (DISSAL), University of Genoa, Genoa, Italy
| | - Sara Sanguinetti
- Department of Experimental Medicine (DIMES), University of Genoa, Genoa, Italy
| | - Carlo Martinoli
- Department of Radiology, IRCCS Ospedale Policlinico San Martino, Genoa, Italy
- Department of Health Sciences (DISSAL), University of Genoa, Genoa, Italy
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Pistoia F, Picasso R, Zaottini F, Sanguinetti S, Caprioli S, Tovt L, Pansecchi M, Martinoli C. High-Resolution Ultrasound of Facial Muscles: Sonoanatomy, Scanning Technique, and Pathological Cases. J Ultrasound Med 2023; 42:547-557. [PMID: 35670279 DOI: 10.1002/jum.16036] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 05/12/2022] [Accepted: 05/22/2022] [Indexed: 06/15/2023]
Abstract
The aim of the present work is to review the sonographic appearance of facial muscles with high-frequency transducers and to illustrate a step-by-step scanning technique that enables an effective evaluation of them. In addition, we highlighted the clinical application showing some pathological cases demonstrated with ultrasound (US). The recent technological advances have greatly enlarged the potential of high-resolution US in the evaluation of the face. Furthermore, the clinical indications of this technique are expected to increase in the near future.
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Affiliation(s)
- Federico Pistoia
- Department of Experimental Medicine (DIMES), University of Genova, Via Leon Battista Alberti 2, Genoa, Italy
| | - Riccardo Picasso
- IRCCS Ospedale Policlinico San Martino, Largo Rosanna Benzi, 10, Genoa, Italy
| | - Federico Zaottini
- IRCCS Ospedale Policlinico San Martino, Largo Rosanna Benzi, 10, Genoa, Italy
| | - Sara Sanguinetti
- Department of Experimental Medicine (DIMES), University of Genova, Via Leon Battista Alberti 2, Genoa, Italy
| | - Simone Caprioli
- Department of Internal Medicine (DIMI), University of Genova, Viale Benedetto XV 6, Genoa, Italy
| | - Luca Tovt
- Department of Health Sciences (DISSAL), Radiology Section, University of Genova, Via Pastore 1, Genoa, Italy
| | - Michelle Pansecchi
- Department of Health Sciences (DISSAL), Radiology Section, University of Genova, Via Pastore 1, Genoa, Italy
| | - Carlo Martinoli
- IRCCS Ospedale Policlinico San Martino, Largo Rosanna Benzi, 10, Genoa, Italy
- Department of Health Sciences (DISSAL), Radiology Section, University of Genova, Via Pastore 1, Genoa, Italy
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Picasso R, Bica P, Pistoia F, Zaottini F, Sanguinetti S, Bovis F, Ponzano M, Pizzorni C, Paolino S, Sulli A, Gotelli E, Martinoli C, Cutolo M. High-resolution Doppler ultrasound in systemic sclerosis: Analysis of digital arteries and nailfold microvasculature using 18-5 MHz and 33-9 MHz probes. Int J Rheum Dis 2022; 25:1288-1294. [PMID: 35962534 PMCID: PMC9804347 DOI: 10.1111/1756-185x.14422] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 05/25/2022] [Accepted: 08/02/2022] [Indexed: 01/05/2023]
Abstract
INTRODUCTION Newly developed Doppler techniques enable the sampling of slow vascular flows and the extrapolation of spectral parameters in distal arterioles. The aim of this study was to investigate the role of spectral analysis performed by means of ultra-high frequency ultrasound (US) in the evaluation of the peripheral vascular bed of systemic sclerosis (SSc) patients. METHODS Both hands of 33 patients affected by diffuse cutaneous SSc and 34 volunteers were evaluated with a US machine equipped with 33-9 MHz and 18-5 MHz transducers. Proximal resistive index and the peak systolic velocity (pRI and pPSV, respectively), were calculated at the level of the second interdigital artery. The distal resistive index (dRI) was calculated at the level of a nailfold arteriole of the third finger. All SSc patients had been previously divided into 4 subgroups according to their nailfold videocapillaroscopic (NVC) patterns following accepted criteria. RESULTS SSc patients showed a significantly slower systolic velocity at the level of the second interdigital artery (pPSV [SD] = 8.38 [3] cm/s vs pPSV [SD] = 11.14 [4.5] cm/s; P = .005) and a higher dRI (dRI [SD] = 0.65 (0.14) vs dRI [SD] = 0.57 [0.11); P = .0115). No differences were found between the pRI values measured in the SSc patients and those of the controls (pRI [SD] = 0.76 [0.11] vs pRI [SD] = 0.73 [0.12]; P = .359]. The subgroup analysis did not show any significant difference when pPSV, pRI and dRI were compared among NVC morphological patterns. CONCLUSION High-resolution Doppler analysis of digital distal arterioles may disclose subtle abnormalities in the downstream microvasculature of SSc patients that could be missed when the examination is performed at a more proximal level and/or using lower Doppler frequencies.
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Affiliation(s)
| | - Pietro Bica
- Laboratory of Experimental Rheumatology and Academic Division of Clinical Rheumatology, Department of Internal Medicine and Specialties (DIMI)University of GenoaGenoaItaly
| | - Federico Pistoia
- IRCCS Ospedale Policlinico San MartinoGenoaItaly,Department of Experimental Medicine (DIMES)University of GenoaGenoaItaly
| | | | - Sara Sanguinetti
- Department of Experimental Medicine (DIMES)University of GenoaGenoaItaly
| | - Francesca Bovis
- Department of Health Sciences (DISSAL)University of GenoaGenoaItaly
| | - Marta Ponzano
- Department of Health Sciences (DISSAL)University of GenoaGenoaItaly
| | - Carmen Pizzorni
- Laboratory of Experimental Rheumatology and Academic Division of Clinical Rheumatology, Department of Internal Medicine and Specialties (DIMI)University of GenoaGenoaItaly
| | - Sabrina Paolino
- Laboratory of Experimental Rheumatology and Academic Division of Clinical Rheumatology, Department of Internal Medicine and Specialties (DIMI)University of GenoaGenoaItaly
| | - Alberto Sulli
- Laboratory of Experimental Rheumatology and Academic Division of Clinical Rheumatology, Department of Internal Medicine and Specialties (DIMI)University of GenoaGenoaItaly
| | - Emanuele Gotelli
- Laboratory of Experimental Rheumatology and Academic Division of Clinical Rheumatology, Department of Internal Medicine and Specialties (DIMI)University of GenoaGenoaItaly
| | - Carlo Martinoli
- IRCCS Ospedale Policlinico San MartinoGenoaItaly,Department of Health Sciences (DISSAL)University of GenoaGenoaItaly
| | - Maurizio Cutolo
- IRCCS Ospedale Policlinico San MartinoGenoaItaly,Laboratory of Experimental Rheumatology and Academic Division of Clinical Rheumatology, Department of Internal Medicine and Specialties (DIMI)University of GenoaGenoaItaly
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Zaottini F, Picasso R, Pistoia F, Sanguinetti S, Pansecchi M, Tovt L, Viglino U, Cabona C, Garnero M, Benedetti L, Martinoli C. High-resolution ultrasound of peripheral neuropathies in rheumatological patients: An overview of clinical applications and imaging findings. Front Med (Lausanne) 2022; 9:984379. [PMID: 36388946 PMCID: PMC9661426 DOI: 10.3389/fmed.2022.984379] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 09/12/2022] [Indexed: 11/13/2022] Open
Abstract
Peripheral neuropathies are surprisingly common and can be associated with a number of conditions, including rheumatological diseases. Whether the co-existence of peripheral neuropathies with rheumatological disorders is coincidental or related to a common pathogenic mechanism, these disabling conditions can affect the outcome of rheumatological patients and should be targeted with specific treatment. The clinical presentation of peripheral neuropathy can be multifaceted and difficult to recognize in polysymptomatic patients. However, physicians adopting state-of-art diagnostic strategies, including nerve imaging, may improve the detection rate and management of neuropathies. In particular, a diagnostic approach relying exclusively on clinical history and nerve conduction studies may not be sufficient to disclose the etiology of the nerve damage and its anatomical location and thus requires integration with morphological studies. High-Resolution Ultrasound (HRUS) is increasingly adopted to support the diagnosis and follow-up of both joint disorders in rheumatology and peripheral neuropathies of different etiologies. In this review, the different types of nerve disorders associated with the most common syndromes of rheumatological interest are discussed, focusing on the distinctive sonographic features.
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Affiliation(s)
- Federico Zaottini
- San Martino Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Genoa, Italy
| | - Riccardo Picasso
- San Martino Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Genoa, Italy
- *Correspondence: Riccardo Picasso,
| | - Federico Pistoia
- Dipartimento di Medicina Sperimentale, Scuola di Scienze Mediche e Farmaceutiche, Università di Genova, Genoa, Italy
| | - Sara Sanguinetti
- Dipartimento di Medicina Sperimentale, Scuola di Scienze Mediche e Farmaceutiche, Università di Genova, Genoa, Italy
| | - Michelle Pansecchi
- Dipartimento di Scienze della Salute, Scuola di Scienze Mediche e Farmaceutiche, Università di Genova, Genoa, Italy
| | - Luca Tovt
- Dipartimento di Scienze della Salute, Scuola di Scienze Mediche e Farmaceutiche, Università di Genova, Genoa, Italy
| | - Umberto Viglino
- Dipartimento di Scienze della Salute, Scuola di Scienze Mediche e Farmaceutiche, Università di Genova, Genoa, Italy
| | - Corrado Cabona
- San Martino Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Genoa, Italy
- Eye Clinic, Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Science, School of Medical and Pharmaceutical Sciences, University of Genoa, Genoa, Italy
| | - Martina Garnero
- San Martino Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Genoa, Italy
- Eye Clinic, Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Science, School of Medical and Pharmaceutical Sciences, University of Genoa, Genoa, Italy
| | - Luana Benedetti
- San Martino Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Genoa, Italy
- Eye Clinic, Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Science, School of Medical and Pharmaceutical Sciences, University of Genoa, Genoa, Italy
| | - Carlo Martinoli
- San Martino Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Genoa, Italy
- Dipartimento di Scienze della Salute, Scuola di Scienze Mediche e Farmaceutiche, Università di Genova, Genoa, Italy
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Pistoia F, Zaottini F, Picasso R, Miguel-Pérez M, Pansecchi M, Tovt L, Sanguinetti S, Martinoli C. High-Resolution Ultrasonography of Minor Nerves Around the Knee. Semin Musculoskelet Radiol 2021. [DOI: 10.1055/s-0041-1731535] [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: 10/21/2022]
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Picasso R, Pistoia F, Zaottini F, Airaldi S, Perez MM, Pansecchi M, Tovt L, Sanguinetti S, Möller I, Bruns A, Martinoli C. High-resolution ultrasound of spigelian and groin hernias: a closer look at fascial architecture and aponeurotic passageways. J Ultrason 2021; 21:53-62. [PMID: 33791116 PMCID: PMC8008201 DOI: 10.15557/jou.2021.0008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 11/28/2020] [Indexed: 11/22/2022] Open
Abstract
From the clinical point of view, a proper diagnosis of spigelian, inguinal and femoral hernias may be relevant for orienting the patient's management, as these conditions carry a different risk of complications and require specific approaches and treatments. Imaging may play a significant role in the diagnostic work-up of patients with suspected abdominal hernias, as the identification and categorization of these conditions is often unfeasible on clinical ground. Ultrasound imaging is particularly suited for this purpose, owing to its dynamic capabilities, high accuracy, low cost and wide availability. The main limitation of this technique consists of its intrinsic operator dependency, which tends to be higher in difficult-to-scan areas such as the groin because of its intrinsic anatomic complexity. An in-depth knowledge of the anatomy of the lower abdominal wall is, therefore, an essential prerequisite to perform a targeted ultrasound examination and discriminate among different types of regional hernias. The aim of this review is to provide a detailed analysis of the fascial architecture and aponeurotic passageways of the abdominal wall through which spigelian, inguinal and femoral hernias extrude, by means of schematic drawings, ultrasound images and video clips. A reasoned landmark-based ultrasound scanning technique is described to allow a prompt and reliable identification of these pathologic conditions.
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Affiliation(s)
- Riccardo Picasso
- Department of Health Science (DISSAL), Università di Genova, Genova, Italy
- UO Radiologia - IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | - Federico Pistoia
- Department of Health Science (DISSAL), Università di Genova, Genova, Italy
- UO Radiologia - IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | - Federico Zaottini
- Department of Health Science (DISSAL), Università di Genova, Genova, Italy
- UO Radiologia - IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | | | - Maribel Miguel Perez
- Unidad de Anatomía y Embriología Humana, Departamento de Patología y Terapéutica Experimental, Facultad de Medicina y Ciencias de la Salud (Campus de Bellvitge), Universitat de Barcelona, L'Hospitalet de Llobregat, Barcelona, Spain
| | - Michelle Pansecchi
- Department of Health Science (DISSAL), Università di Genova, Genova, Italy
- UO Radiologia - IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | - Luca Tovt
- Department of Health Science (DISSAL), Università di Genova, Genova, Italy
- UO Radiologia - IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | - Sara Sanguinetti
- Department of Health Science (DISSAL), Università di Genova, Genova, Italy
- UO Radiologia - IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | | | - Alessandra Bruns
- Division of Rheumatology, Sherbrooke University, Sherbrooke, Canada
| | - Carlo Martinoli
- Department of Health Science (DISSAL), Università di Genova, Genova, Italy
- UO Radiologia - IRCCS Ospedale Policlinico San Martino, Genova, Italy
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Picasso R, Pistoia F, Zaottini F, Sanguinetti S, Calabrese M, Martinoli C, Derchi L. Breast Metastases: Updates on Epidemiology and Radiologic Findings. Cureus 2020; 12:e12258. [PMID: 33520480 PMCID: PMC7834593 DOI: 10.7759/cureus.12258] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Purpose The aim of this study was to report the prevalence of secondary breast malignancies and analyze their radiological characteristics. Materials and methods We collected 42,505 pathological reports of mammary biopsies performed from January 2000 to January 2019 in our hospital database, from which we screened reports of secondary cancer of the breast. We collected and analyzed imaging data from computed tomography (CT), ultrasound (US), and mammography. Mammograms, CT scans, and US images were reviewed by two breast radiologists. Prevalence of secondary breast malignancy among suspicious breast masses and all breast malignancies were calculated. Results Out of 42,505 histopathology reports from mammary biopsies, we found 19,354 malignancies. We identified 33 cases of secondary breast cancers (0.08% of suspicious breast lesions, 0.17% of breast malignancies). Most common metastases were from lymphoma (23 cases, 0.05% of suspicious breast lesions, 0.12% of breast malignancies) and melanoma (six cases, 0.01% of suspicious breast lesions, 0.03% of breast malignancies). All secondary lesions were hypoechoic on US and showed high density on mammogram. On CT, 83% of the lesions appeared solid/dense, and 17% were mixed, alternating areas of iso/hyperdensity with areas of hypodensity. Conclusion Secondary breast cancer had a prevalence of 0.17% among all breast malignancies. No specific imaging features, characteristic of secondary breast cancer, were found.
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Affiliation(s)
- Riccardo Picasso
- Radiology, Department of Health Sciences, University of Genova, Genoa, ITA
| | - Federico Pistoia
- Radiology, Department of Health Sciences, University of Genova, Genoa, ITA
| | - Federico Zaottini
- Radiology, Department of Health Sciences, University of Genova, Genoa, ITA
| | - Sara Sanguinetti
- Radiology, Department of Health Sciences, University of Genova, Genoa, ITA
| | | | - Carlo Martinoli
- Radiology, Department of Health Sciences, University of Genova, Genoa, ITA
| | - Lorenzo Derchi
- Radiology, Department of Health Sciences, University of Genova, Genoa, ITA
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Toliopoulos D, Khoury M, Bouabdellaoui M, Granchi N, Claude JB, Benali A, Berbezier I, Hannani D, Ronda A, Wenger J, Bollani M, Gurioli M, Sanguinetti S, Intonti F, Abbarchi M. Fabrication of spectrally sharp Si-based dielectric resonators: combining etaloning with Mie resonances. Opt Express 2020; 28:37734-37742. [PMID: 33379602 DOI: 10.1364/oe.409001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 10/18/2020] [Indexed: 06/12/2023]
Abstract
We use low-resolution optical lithography joined with solid state dewetting of crystalline, ultra-thin silicon on insulator (c-UT-SOI) to form monocrystalline, atomically smooth, silicon-based Mie resonators in well-controlled large periodic arrays. The dewetted islands have a typical size in the 100 nm range, about one order of magnitude smaller than the etching resolution. Exploiting a 2 µm thick SiO2 layer separating the islands and the underlying bulk silicon wafer, we combine the resonant modes of the antennas with the etalon effect. This approach sets the resonance spectral position and improves the structural colorization and the contrast between scattering maxima and minima of individual resonant antennas. Our results demonstrate that templated dewetting enables the formation of defect-free, faceted islands that are much smaller than the nominal etching resolution and that an appropriate engineering of the substrate improves their scattering properties. These results are relevant to applications in spectral filtering, structural color and beam steering with all-dielectric photonic devices.
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Pistoia F, Zaottini F, Picasso R, Sanguinetti S, Perez MM, Martinoli C. High-Resolution Ultrasound of Multibanded Anterior Talofibular Ligament: Anatomical Correlation on Cadavers and Sonographic Pathologic Findings in Sprained Ankles. Semin Musculoskelet Radiol 2020. [DOI: 10.1055/s-0040-1722520] [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: 10/22/2022]
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Somaschini C, Biermanns A, Bietti S, Bussone G, Trampert A, Sanguinetti S, Riechert H, Pietsch U, Geelhaar L. Axial InAs/GaAs heterostructures on silicon in a nanowire geometry. Nanotechnology 2014; 25:485602. [PMID: 25391271 DOI: 10.1088/0957-4484/25/48/485602] [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: 06/04/2023]
Abstract
InAs segments were grown on top of GaAs islands, initially created by droplet epitaxy on silicon substrate. We systematically explored the growth-parameter space for the deposition of InAs, identifying the conditions for the selective growth on GaAs and for purely axial growth. The axial InAs segments were formed with their sidewalls rotated by 30° compared to the GaAs base islands underneath. Synchrotron X-ray diffraction experiments revealed that the InAs segments are grown relaxed on top of GaAs, with a predominantly zincblende crystal structure and stacking faults.
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Affiliation(s)
- C Somaschini
- Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany
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Bollani M, Bietti S, Frigeri C, Chrastina D, Reyes K, Smereka P, Millunchick JM, Vanacore GM, Burghammer M, Tagliaferri A, Sanguinetti S. Ordered arrays of embedded Ga nanoparticles on patterned silicon substrates. Nanotechnology 2014; 25:205301. [PMID: 24784353 DOI: 10.1088/0957-4484/25/20/205301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We fabricate site-controlled, ordered arrays of embedded Ga nanoparticles on Si, using a combination of substrate patterning and molecular-beam epitaxial growth. The fabrication process consists of two steps. Ga droplets are initially nucleated in an ordered array of inverted pyramidal pits, and then partially crystallized by exposure to an As flux, which promotes the formation of a GaAs shell that seals the Ga nanoparticle within two semiconductor layers. The nanoparticle formation process has been investigated through a combination of extensive chemical and structural characterization and theoretical kinetic Monte Carlo simulations.
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Affiliation(s)
- M Bollani
- CNR-IFN, L-NESS, via Anzani 42, I-22100 Como, Italy
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Abstract
We present an experimental investigation of the crystallization dynamics of Ga nano-droplets under As flux. The transformation of the metallic Ga contained in the droplets into a GaAs nano-island proceeds by increasing the size of a tiny ring of GaAs which is formed just after the Ga deposition at the rim of a droplet. The GaAs crystallization rate depends linearly on the liquid-solid interface area. The maximum growth rate is set by the As flux impinging on the droplet, thus showing an efficient As incorporation and transport despite the predicted low solubility of the As in metallic Ga at the crystallization temperatures.
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Affiliation(s)
- S Bietti
- L-NESS and Dipartimento di Scienza dei Materiali, Universitá di Milano Bicocca, Via Cozzi 53, I-20125 Milano, Italy
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14
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Cavigli L, Bietti S, Abbarchi M, Somaschini C, Vinattieri A, Gurioli M, Fedorov A, Isella G, Grilli E, Sanguinetti S. Fast emission dynamics in droplet epitaxy GaAs ring-disk nanostructures integrated on Si. J Phys Condens Matter 2012; 24:104017. [PMID: 22353556 DOI: 10.1088/0953-8984/24/10/104017] [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: 05/31/2023]
Abstract
The emission dynamics in GaAs/AlGaAs coupled ring-disk (CRD) quantum structures fabricated on silicon substrates is presented. The CRD structures are self-assembled via droplet epitaxy, a growth technique which, due to its low thermal budget, is compatible with the monolithic integration of III-V devices on Si based electronic circuits. Continuous wave, time resolved photoluminescence and theoretical calculations in the effective mass approximations are presented for the assessment of the electronic and carrier properties of the CRDs. The CRDs show a fast carrier dynamics which is expected to be suitable for ultrafast optical switching applications integrated on silicon.
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Affiliation(s)
- L Cavigli
- LENS and Dipartimento di Fisica, Universitá di Firenze, Via Sansone 1, I-50019, Sesto Fiorentino, Italy
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Abstract
The fabrication, by pure self-assembly, of GaAs/AlGaAs dot-ring quantum nanostructures is presented. The growth is performed via droplet epitaxy, which allows for the fine control, through As flux and substrate temperature, of the crystallization kinetics of nanometer scale metallic Ga reservoirs deposited on the surface. Such a procedure permits the combination of quantum dots and quantum rings into a single, multi-functional, complex quantum nanostructure.
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Affiliation(s)
- C Somaschini
- L-NESS and Dipartimento di Scienza dei Materiali, Universitá di Milano Bicocca, Via Cozzi 53, I-20125 Milano, Italy
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Schieber M, Zuck A, Braiman M, Melekhov L, Nissenbaum J, Turchetta R, Dulinski W, Husson D, Riester JL, Schlesinger TE, Toney J, Sanguinetti S, Montalti M, Guzzi M. Towards Imaging with Polycrystalline Mercuric Iodide Semiconductor Detectors. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-487-329] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractPreparation of polycrystalline mercuric iodide very thin (1 μm) films using laser ablation and thick films (100–600μm), using hot pressing, hot wall vapor deposition and screen printing methods, fabricated as radiation detector plates are briefly described. X-ray diffraction, photoluminescence and optical microscopic measurements as well as response to nuclear radiation will be given. Finally, recent results obtained with a large area imaging pixel detector will be shown.
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Somaschini C, Bietti S, Fedorov A, Koguchi N, Sanguinetti S. Erratum to: Concentric Multiple Rings by Droplet Epitaxy: Fabrication and Study of the Morphological Anisotropy. Nanoscale Res Lett 2010; 5:1992. [PMID: 27502289 PMCID: PMC2991176 DOI: 10.1007/s11671-010-9816-6] [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] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- C Somaschini
- L-NESS and Dipartimento di Scienza dei Materiali, Universita' di Milano Bicocca, Via Cozzi 53, 20125, Milano, Italy
| | - S Bietti
- L-NESS and Dipartimento di Scienza dei Materiali, Universita' di Milano Bicocca, Via Cozzi 53, 20125, Milano, Italy
| | - A Fedorov
- CNISM, L-NESS and Dipartimento di Fisica del Politecnico di Milano, Via Anzani 42, 22100, Como, Italy
| | - N Koguchi
- L-NESS and Dipartimento di Scienza dei Materiali, Universita' di Milano Bicocca, Via Cozzi 53, 20125, Milano, Italy
| | - S Sanguinetti
- L-NESS and Dipartimento di Scienza dei Materiali, Universita' di Milano Bicocca, Via Cozzi 53, 20125, Milano, Italy.
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Bietti S, Somaschini C, Koguchi N, Frigeri C, Sanguinetti S. Self-Assembled Local Artificial Substrates of GaAs on Si Substrate. Nanoscale Res Lett 2010; 5:1905-1907. [PMID: 21170400 PMCID: PMC2991201 DOI: 10.1007/s11671-010-9760-5] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Accepted: 08/14/2010] [Indexed: 05/30/2023]
Abstract
We propose a self-assembling procedure for the fabrication of GaAs islands by Droplet Epitaxy on silicon substrate. Controlling substrate temperature and amount of supplied gallium is possible to tune the base size of the islands from 70 up to 250 nm and the density from 10(7) to 10(9) cm(-2). The islands show a standard deviation of base size distribution below 10% and their shape evolves changing the aspect ratio from 0.3 to 0.5 as size increases. Due to their characteristics, these islands are suitable to be used as local artificial substrates for the integration of III-V quantum nanostructures directly on silicon substrate.
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Affiliation(s)
- S Bietti
- L-NESS and Dipartimento di Scienza dei Materiali, Universita’ di Milano Bicocca, via Cozzi 53, 20125, Milan, Italy
| | - C Somaschini
- L-NESS and Dipartimento di Scienza dei Materiali, Universita’ di Milano Bicocca, via Cozzi 53, 20125, Milan, Italy
| | - N Koguchi
- L-NESS and Dipartimento di Scienza dei Materiali, Universita’ di Milano Bicocca, via Cozzi 53, 20125, Milan, Italy
| | - C Frigeri
- Istituto CNR-IMEM, Parco Area delle Scienze 37/A, 43100, Parma, Italy
| | - S Sanguinetti
- L-NESS and Dipartimento di Scienza dei Materiali, Universita’ di Milano Bicocca, via Cozzi 53, 20125, Milan, Italy
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Somaschini C, Bietti S, Fedorov A, Koguchi N, Sanguinetti S. Growth Interruption Effect on the Fabrication of GaAs Concentric Multiple Rings by Droplet Epitaxy. Nanoscale Res Lett 2010; 5:1897-1900. [PMID: 21170414 PMCID: PMC2991240 DOI: 10.1007/s11671-010-9752-5] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Accepted: 08/09/2010] [Indexed: 05/30/2023]
Abstract
WE PRESENT THE MOLECULAR BEAM EPITAXY FABRICATION AND OPTICAL PROPERTIES OF COMPLEX GAAS NANOSTRUCTURES BY DROPLET EPITAXY: concentric triple quantum rings. A significant difference was found between the volumes of the original droplets and the final GaAs structures. By means of atomic force microscopy and photoluminescence spectroscopy, we found that a thin GaAs quantum well-like layer is developed all over the substrate during the growth interruption times, caused by the migration of Ga in a low As background.
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Affiliation(s)
- C Somaschini
- L-NESS and Dipartimento di Scienza dei Materiali, Universita’ di Milano Bicocca, Via Cozzi 53, 20125, Milan, Italy
| | - S Bietti
- L-NESS and Dipartimento di Scienza dei Materiali, Universita’ di Milano Bicocca, Via Cozzi 53, 20125, Milan, Italy
| | - A Fedorov
- CNISM, L-NESS and Dipartimento di Fisica, Politecnico di Milano, Via Anzani 42, 22100, Como, Italy
| | - N Koguchi
- L-NESS and Dipartimento di Scienza dei Materiali, Universita’ di Milano Bicocca, Via Cozzi 53, 20125, Milan, Italy
| | - S Sanguinetti
- L-NESS and Dipartimento di Scienza dei Materiali, Universita’ di Milano Bicocca, Via Cozzi 53, 20125, Milan, Italy
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20
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Somaschini C, Bietti S, Fedorov A, Koguchi N, Sanguinetti S. Concentric Multiple Rings by Droplet Epitaxy: Fabrication and Study of the Morphological Anisotropy. Nanoscale Res Lett 2010; 5:1865-1867. [PMID: 21170420 PMCID: PMC2995438 DOI: 10.1007/s11671-010-9699-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Accepted: 07/13/2010] [Indexed: 05/30/2023]
Abstract
We present the Molecular Beam Epitaxy fabrication of complex GaAs/AlGaAs nanostructures by Droplet Epitaxy, characterized by the presence of concentric multiple rings. We propose an innovative experimental procedure that allows the fabrication of individual portions of the structure, controlling their diameter by only changing the substrate temperature. The obtained nanocrystals show a significant anisotropy between [110] and [1-10] crystallographic directions, which can be ascribed to different activation energies for the Ga atoms migration processes.
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Affiliation(s)
- C Somaschini
- LNESS and Dipartimento di Scienza dei Materiali, via Cozzi 53, 20125, Milan, Italy
| | - S Bietti
- LNESS and Dipartimento di Scienza dei Materiali, via Cozzi 53, 20125, Milan, Italy
| | - A Fedorov
- LNESS and Dipartimento di Scienza dei Materiali, via Cozzi 53, 20125, Milan, Italy
| | - N Koguchi
- LNESS and Dipartimento di Scienza dei Materiali, via Cozzi 53, 20125, Milan, Italy
| | - S Sanguinetti
- LNESS and Dipartimento di Scienza dei Materiali, via Cozzi 53, 20125, Milan, Italy
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21
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Bietti S, Somaschini C, Sarti E, Koguchi N, Sanguinetti S, Isella G, Chrastina D, Fedorov A. Photoluminescence Study of Low Thermal Budget III-V Nanostructures on Silicon by Droplet Epitaxy. Nanoscale Res Lett 2010; 5:1650-1653. [PMID: 21076665 PMCID: PMC2956041 DOI: 10.1007/s11671-010-9689-8] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2010] [Accepted: 07/01/2010] [Indexed: 05/30/2023]
Abstract
We present of a detailed photoluminescence characterization of high efficiency GaAs/AlGaAs quantum nanostructures grown on silicon substrates. The whole process of formation of the GaAs/AlGaAs active layer was realized via droplet epitaxy and migration enhanced epitaxy maintaining the growth temperature ≤350°C, thus resulting in a low thermal budget procedure compatible with back-end integration of the fabricated materials on integrated circuits.
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Affiliation(s)
- S Bietti
- L-NESS and Dipartimento di Scienza dei Materiali, Via Cozzi 53, 20125, Milano, Italy
| | - C Somaschini
- L-NESS and Dipartimento di Scienza dei Materiali, Via Cozzi 53, 20125, Milano, Italy
| | - E Sarti
- L-NESS and Dipartimento di Scienza dei Materiali, Via Cozzi 53, 20125, Milano, Italy
| | - N Koguchi
- L-NESS and Dipartimento di Scienza dei Materiali, Via Cozzi 53, 20125, Milano, Italy
| | - S Sanguinetti
- L-NESS and Dipartimento di Scienza dei Materiali, Via Cozzi 53, 20125, Milano, Italy
| | - G Isella
- CNISM, L-NESS and Dipartimento di Fisica del Politecnico di Milano, Via Anzani 42, 22100, Como, Italy
| | - D Chrastina
- CNISM, L-NESS and Dipartimento di Fisica del Politecnico di Milano, Via Anzani 42, 22100, Como, Italy
| | - A Fedorov
- CNISM, L-NESS and Dipartimento di Fisica del Politecnico di Milano, Via Anzani 42, 22100, Como, Italy
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Bagolini L, Mattoni A, Fugallo G, Colombo L, Poliani E, Sanguinetti S, Grilli E. Quantum confinement by an order-disorder boundary in nanocrystalline silicon. Phys Rev Lett 2010; 104:176803. [PMID: 20482126 DOI: 10.1103/physrevlett.104.176803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2009] [Indexed: 05/29/2023]
Abstract
We predict theoretically and show experimentally the occurrence of quantum confinement in hydrogenated nanocrystalline silicon. We prove that only valence states (positively charged carriers) are confined effectively within the nanograins. The emission associated to confined states is verified by photoluminescence experiments on nanocrystalline samples with controlled grain size. According to the present study, we propose nanocrystalline silicon as a promising material for oxygen-free optoelectronics, silicon-based memories and photovoltaics.
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Affiliation(s)
- L Bagolini
- Dipartimento di Energetica, Università di Roma La Sapienza, Via A. Scarpa 1416, 00161 Roma, Italy
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Somaschini C, Bietti S, Sanguinetti S, Koguchi N, Fedorov A. Self-assembled GaAs/AlGaAs coupled quantum ring-disk structures by droplet epitaxy. Nanotechnology 2010; 21:125601. [PMID: 20182013 DOI: 10.1088/0957-4484/21/12/125601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The fabrication, by droplet epitaxy, of a class of quantum nanostructures characterized by a regular, nanometres high, flat disks with a diameter of hundreds of nanometres and a hole at the centre encircled by a ring a few nanometres high, is presented here. A detailed analysis of the growth kinetics performed via in situ and ex situ probes allows us to propose a working model for the formation of these structures.
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Affiliation(s)
- C Somaschini
- L-NESS and Dipartimento di Scienza dei Materiali dell'Università degli Studi di Milano-Bicocca, Milano, Italy
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Abstract
We present the fabrication of GaAs/AlGaAs Multiple (from three to five) concentric nanoring structures by an innovative growth method based on droplet epitaxy and characterized by short time As supply to the Ga droplets at different substrate temperatures. The formation mechanism has been interpreted on the basis of a detailed ex situ and in situ characterization of nanostructure morphology and surface reconstruction. We introduce design criteria which will allow to obtain concentric quantum ring structures of the desired complexity.
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Affiliation(s)
- C Somaschini
- L-NESS and Dipartimento di Scienza dei Materiali, Universita di Milano Bicocca, Via Cozzi 53, I-20125, Milano, Italy
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25
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Mano T, Abbarchi M, Kuroda T, Mastrandrea CA, Vinattieri A, Sanguinetti S, Sakoda K, Gurioli M. Ultra-narrow emission from single GaAs self-assembled quantum dots grown by droplet epitaxy. Nanotechnology 2009; 20:395601. [PMID: 19724114 DOI: 10.1088/0957-4484/20/39/395601] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We realized ultra-narrow excitonic emission from single GaAs/AlGaAs quantum dots (QDs) grown by a refined droplet epitaxy technique. We found that uncapped quantum dots can be annealed at 400 degrees C without major changes in their morphology, thus enabling an AlGaAs capping layer to be grown at that temperature. Consequently, we demonstrate a fourfold reduction of the linewidth of the emission together with an increased recombination lifetime, compared to the conventional droplet epitaxial QDs. The averaged linewidth of neutral excitons measured by micro-photoluminescence on single quantum dots was around 35 microeV.
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Affiliation(s)
- T Mano
- Quantum Dot Research Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan.
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26
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Sanguinetti S, Calabrese R, Corradi L, Dainelli A, Khanbekyan A, Mariotti E, de Mauro C, Minguzzi P, Moi L, Stancari G, Tomassetti L, Veronesi S. Accurate measurements of transition frequencies and isotope shifts of laser-trapped francium. Opt Lett 2009; 34:893-895. [PMID: 19340162 DOI: 10.1364/ol.34.000893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
An interferometric method is used to improve the accuracy of the 7S-7P transition frequencies of three francium isotopes by 1 order of magnitude. The deduced isotope shifts for 209-211Fr confirm the ISOLDE data. The frequency of the D2 transition of 212Fr--the accepted reference for all Fr isotope shifts--is revised, and a significant difference with the ISOLDE value is found. Our results will be a benchmark for the accuracy of the theory of Fr energy levels, a necessary step to investigate fundamental symmetries.
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Affiliation(s)
- S Sanguinetti
- Consorzio Nazionale Interuniversitario per le Scienze Fisiche della-Unità di Pisa, Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy.
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27
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Muzzio ML, Berg G, Zago V, Basilio F, Sanguinetti S, Lopez G, Brites F, Wikinski R, Schreier L. Circulating small dense LDL, endothelial injuring factors and fibronectin in healthy postmenopausal women. Clin Chim Acta 2007; 381:157-63. [PMID: 17433279 DOI: 10.1016/j.cca.2007.03.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2006] [Revised: 02/28/2007] [Accepted: 03/07/2007] [Indexed: 01/18/2023]
Abstract
BACKGROUND In postmenopausal women (PMW), an adverse lipoprotein pattern and high risk of coronary artery disease has been described. Studies of the mechanisms promoting the higher atherogenic risk observed in healthy PMW are relevant. We evaluated the interactions among several circulating factors involved in the endothelial injury and inflammation in relation to LDL characteristics, beyond LDL cholesterol. METHODS Lipoprotein profile, including apolipoproteins A-I and B, small dense LDL, hepatic lipase, cholesterol transfer protein (CETP), LDL composition and oxidability were assessed in PMW (n=30) in comparison to premenopausal (PreMW, n=28). The following emerging factors were measured: homocysteine, phospholipase A2, ferritin, hs-CRP and fibronectin from extracellular vascular matrix. Insulin-resistance was evaluated by waist circumference, HOMA and TG/HDL cholesterol ratios. RESULTS The risk index apo B/apo A-I was significantly increased in PMW (p<0.0001), PMW showed higher proportion of small dense LDL which correlated with the increase in hepatic lipase activity (p<0.005) and with insulin-resistance markers (p<0.05), but not with CETP. Phospholipase A2 (p<0.05), homocysteine (p<0.005), hs-CRP (p<0.005), fibronectin (p<0.05) and ferritin (p<0.0001) were increased in PMW. LDL oxidability positively correlated with waist (p<0.02), homocysteine (p<0.05), fibronectin (p<0.05), hs-CRP (p<0.04), phospholipase A2 (p<0.05), and small dense LDL (p<0.01). After adjusting by menopausal condition, age and waist, LDL oxidability remained associated with waist (beta: 0.35, p=0.047), homocysteine (beta: 0,36 p<0,038), fibronectin (beta: 0,41 p=0.05), and small dense LDL (beta: 0.36, p=0.027). CONCLUSIONS Evaluation of classic and non-traditional circulating risk factors in hypoestrogenism reflected endothelial and subendothelial inflammation and subclinical atherogenic processes.
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Affiliation(s)
- M L Muzzio
- Laboratory of Lipids and Lipoproteins, Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Argentina
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Schreier L, Sanguinetti S, Zago V, Brites F, Basilio F, Berg G, Muzzio M, Wikinski R. W06.165 Impaired antioxidant activity in high density lipoprotein from healthy postmenopausal women. ATHEROSCLEROSIS SUPP 2004. [DOI: 10.1016/s1567-5688(04)90164-5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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29
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Guéna J, Chauvat D, Jacquier P, Jahier E, Lintz M, Sanguinetti S, Wasan A, Bouchiat MA, Papoyan AV, Sarkisyan D. New manifestation of atomic parity violation in cesium: a chiral optical gain induced by linearly polarized 6S-7S excitation. Phys Rev Lett 2003; 90:143001. [PMID: 12731912 DOI: 10.1103/physrevlett.90.143001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2002] [Indexed: 05/24/2023]
Abstract
We have detected, by using stimulated emission, an atomic parity violation (APV) in the form of a chiral optical gain of a cesium vapor on the 7S-6P(3/2) transition, consecutive to linearly polarized 6S-7S excitation. We demonstrate the validity of this detection method of APV, by presenting a 9% accurate measurement of expected sign and magnitude. We stress several advantages of this new approach which fully exploits the cylindrical symmetry of the setup. Future measurements at the percent level will provide an important cross-check of an existing more precise result obtained by a different method.
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Affiliation(s)
- J Guéna
- Laboratoire Kastler Brossel, 24 Rue Lhomond, F-75231 Paris Cedex 05, France
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Schreier L, Sanguinetti S, Verona J, Elbert A, Wikinski R. HDL oxidability in type 2 diabetic patients. Atherosclerosis 2000. [DOI: 10.1016/s0021-9150(00)80063-5] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sanguinetti S, Chiantoni G, Miotto A, Grilli E, Guzzi M, Henini M, Polimeni A, Patane A, Eaves L, Main PC. Self-assembling of In(Ga)As/GaAs quantum dots on (N11) substrates: the (311)A case. Micron 2000; 31:309-13. [PMID: 10702981 DOI: 10.1016/s0968-4328(99)00098-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We have investigated the In(Ga)As island formation, in the Stranski-Krastanov growth mode, on (311)A GaAs substrates. The surface topography of InAs and InGaAs strained epilayers was studied by contact microscopies. The different substrate affects the overgrown island shape. In(Ga)As grown on (311)A gives rise to quantum wire-like islands. Quantum dots (QDs), but with highly anisotropic shapes, are the outcomes of InAs deposition. QD samples were also characterized by photoluminescence (PL) measurements. Correlation between optical and morphological properties was observed.
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Schreier L, Pagliero F, Sanguinetti S, Wikinski R. Influence of the medium on the assessment of LDL resistance to oxidation: lag time in phosphate buffered saline is longer than in sodium chloride solution. Atherosclerosis 1997; 129:127-8. [PMID: 9069527 DOI: 10.1016/s0021-9150(96)05996-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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34
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Schreier LE, Sanguinetti S, Mosso H, Lopez GI, Siri L, Wikinski RL. Low-density lipoprotein composition and oxidability in atherosclerotic cardiovascular disease. Clin Biochem 1996; 29:479-87. [PMID: 8884071 DOI: 10.1016/0009-9120(96)00069-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVES To characterize low-density lipoprotein (LDL) chemical composition and oxidability in normolipidemic and dyslipidemic patients with atherosclerotic cardiovascular disease, as compared with matched control subjects. To evaluate LDL susceptibility to oxidation, we determined the cutoff points of thiobarbituric reactive substances (TBARS) in LDL after oxidative stress, as well as its resistance to oxidation. DESIGN AND METHODS LDL (density 1.019-1.063 g/mL) of 24 men with atherosclerotic cardiovascular disease (12 normolipidemic and 12 dyslipidemic patients) and 18 age-matched healthy control men. LDL chemical composition was determined and apo B/cholesterol ratio was calculated. TBARS in native LDL and after 60 and 120 min of LDL oxidation with copper were measured. The conjugated diene production kinetics during LDL incubation with copper were also studied, lag time being an oxidation resistance marker. Cutoff points for the positivity criterion of apoB/cholesterol ratio in LDL and TBARS in native and oxidized LDL were evaluated using the receiver operator characteristic (ROC) graphic method. RESULTS LDL were triglyceride-enriched, the apoB/cholesterol ratio being higher in patients than in controls, without differences between normolipidemic and dyslipidemic subgroups. We have established the following cutoff values to differentiate between patients and controls: 0.43 mg/mg for the apo B/cholesterol ratio in LDL; 3.0 nmol malondialdehyde/mg protein for TBARS in native LDL; 22 and 80 nmol malondialdehyde/mg protein after 60- and 120-min postoxidative stress, respectively. We did not find differences in the conjugated diene production kinetics between patients and controls. CONCLUSIONS The enrichment in triglycerides and the high apoB/ cholesterol ratio suggest the presence of an abnormal LDL particle in normolipidemic and dyslipidemic patients. This LDL particle was more susceptible to oxidation. In the ROC analysis, the TBARS plot at 120 min exhibited greater accuracy and better performance than the other LDL oxidability markers.
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Affiliation(s)
- L E Schreier
- Department of Clinical Biochemistry, Faculty of Pharmacy and Biochemistry, University of Buenos Aires, Argentina
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35
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Sanguinetti S, Calegari C, Velasco VR, Benedek G, Tavazza F, Miglio L. Phonon mechanism for the orthorhombic distortion in FeSi2 as compared to cubic CoSi2. Phys Rev B Condens Matter 1996; 54:9196-9203. [PMID: 9984649 DOI: 10.1103/physrevb.54.9196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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36
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Snoke DW, Cardona M, Sanguinetti S, Benedek G. Comparison of bond character in hydrocarbons and fullerenes. Phys Rev B Condens Matter 1996; 53:12641-12642. [PMID: 9982931 DOI: 10.1103/physrevb.53.12641] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Sanguinetti S, Benedek G, Righetti M, Onida G. Erratum: Dynamical properties and related optical spectra of fullerenes: The bond-charge-model description. Phys Rev B Condens Matter 1996; 53:8789. [PMID: 9986963 DOI: 10.1103/physrevb.53.8789] [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: 04/12/2023]
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39
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Sanguinetti S, Pignatel G. Anomalous conductivity and electron-coupling-constant scaling in metallic phosphorous-doped silicon. Phys Rev B Condens Matter 1995; 51:2214-2217. [PMID: 9978969 DOI: 10.1103/physrevb.51.2214] [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: 04/12/2023]
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40
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Sanguinetti S, Benedek G. Charge-induced vibrational shifts and vibronic coupling constant in charged C60n-. Phys Rev B Condens Matter 1994; 50:15439-15441. [PMID: 9975905 DOI: 10.1103/physrevb.50.15439] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Peredo HA, Filinger EJ, Sanguinetti S, Lorenzo PS, Adler-Graschinsky E. Prostanoid production in hypoxic rat isolated atria: influence of acute diabetes. Prostaglandins Leukot Essent Fatty Acids 1994; 51:231-4. [PMID: 7846089 DOI: 10.1016/0952-3278(94)90184-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The effects of hypoxia on prostanoid production were studied in atria from normal, acute diabetic and insulin-treated diabetic rats. Diabetes was induced by intravenous administration of 65 mg/kg of streptozotocin, the rats were killed 5 days later. Hypoxia was performed by incubation of the atria during 60 min in nitrogen-equilibrated glucose free Krebs' solution followed by 15 min of reoxygenation. The prostanoids 6-keto prostaglandin F1 alpha (6-keto PGF1 alpha) and thromboxane B2 (TXB2), stable metabolites of prostacyclin and TXA2, respectively, as well as PGF2, were measured by reversed phase HPLC-UV. In control atria, the production of 6-keto PGF1 alpha was equivalent to that of PGE2, whereas TXB2 was released in a much smaller amount. In diabetic atria, 6-keto PGF1 alpha production was reduced by 65%, whereas TXB2 release was increased by 158% compared to the controls. When the normal atria were exposed to 60 min of hypoxia, the release of 6-keto PGF1 alpha increased by 142% compared to basal values and remained elevated after 15 min of reoxygenation whereas in diabetic and insulin-treated diabetic tissues the 6-keto PGF1 alpha production was not modified by the hypoxia-reoxygenation period. The release of TXB2 was increased after 60 min hypoxia in normal as well as in diabetic and insulin-treated diabetic tissues and remained elevated during the reoxygenation. The PGE2 output increased only after the onset of the reoxygenation in the three groups studied.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- H A Peredo
- Instituto de Investigaciones Farmacológicas (ININFA), Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET), Buenos Aires, Argentina
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Sanguinetti S, Benedek G, Righetti M, Onida G. Dynamical properties and related optical spectra of fullerenes: The bond-charge-model description. Phys Rev B Condens Matter 1994; 50:6743-6750. [PMID: 9974626 DOI: 10.1103/physrevb.50.6743] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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