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Saraiva AL, Payan-Carreira R, Gärtner F, Faria F, Lourenço LM, Pires MA. Changes in c-erbB-2 Immunoexpression in Feline Endometrial Adenocarcinomas. Reprod Domest Anim 2015; 51:33-9. [PMID: 26638806 DOI: 10.1111/rda.12642] [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: 08/06/2015] [Accepted: 10/23/2015] [Indexed: 11/30/2022]
Abstract
Human epidermal growth factor receptor type 2 (c-erbB-2), an oncoprotein with potential prognostic marker and therapeutic use, is overexpressed in several human and animal tumours. But information regarding this molecule in feline tumours is scarce. This study aimed to assess the changes in the immunohistochemical expression of c-erbB-2 in feline endometrial adenocarcinomas (FEA) compared to normal endometrium. An immunohistochemistry assay using a specific antibody against c-erbB-2 was performed in FEA samples (n = 34) and in normal endometrium in the follicular (FS; n = 12) and luteal (LS; n = 11) stages. In FEA, the c-erbB-2 immunoexpression was assessed in neoplastic epithelial cells whilst in normal endometria it was individually evaluated in the surface and the superficial and deep glandular epithelia (SE, SGE and DGE, respectively). In FS and in LS, all the epithelia were positive for c-erbB-2; positivity was higher in the SE and the SGE than in DGE. Twenty of the 34 FEA samples (58.8%) were positive for c-erbB-2 immunolabelling. Nevertheless, its expression was higher in all the epithelia in the FS compared to FEA (p ≤ 0.0001) or the LS (p = 0.016). The results presented herein suggest that c-erbB-2 molecule is differently expressed in the feline endometrium through the oestrous cycle and though it may also be involved in feline endometrial carcinogenesis, a question remains unanswered on the importance of additional pathways of epithelial proliferation in the neoplastic changes in feline endometrium.
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Affiliation(s)
- A L Saraiva
- CECAV, Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal.,Escola Universitária Vasco da Gama (EUVG), Coimbra, Portugal
| | - R Payan-Carreira
- CECAV, Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal
| | - F Gärtner
- Abel Salazar Institute of Biomedical Sciences (ICBAS), University of Porto, Porto, Portugal.,Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal
| | - F Faria
- Abel Salazar Institute of Biomedical Sciences (ICBAS), University of Porto, Porto, Portugal
| | - L M Lourenço
- CECAV, Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal
| | - M A Pires
- CECAV, Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal
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Betz AC, Wacquez R, Vinet M, Jehl X, Saraiva AL, Sanquer M, Ferguson AJ, Gonzalez-Zalba MF. Dispersively Detected Pauli Spin-Blockade in a Silicon Nanowire Field-Effect Transistor. Nano Lett 2015; 15:4622-4627. [PMID: 26047255 DOI: 10.1021/acs.nanolett.5b01306] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the dispersive readout of the spin state of a double quantum dot formed at the corner states of a silicon nanowire field-effect transistor. Two face-to-face top-gate electrodes allow us to independently tune the charge occupation of the quantum dot system down to the few-electron limit. We measure the charge stability of the double quantum dot in DC transport as well as dispersively via in situ gate-based radio frequency reflectometry, where one top-gate electrode is connected to a resonator. The latter removes the need for external charge sensors in quantum computing architectures and provides a compact way to readout the dispersive shift caused by changes in the quantum capacitance during inter-dot charge transitions. Here, we observe Pauli spin-blockade in the high-frequency response of the circuit at finite magnetic fields between singlet and triplet states. The blockade is lifted at higher magnetic fields when intra-dot triplet states become the ground state configuration. A line shape analysis of the dispersive phase shift reveals furthermore an intra-dot valley-orbit splitting Δvo of 145 μeV. Our results open up the possibility to operate compact complementary metal-oxide semiconductor (CMOS) technology as a singlet-triplet qubit and make split-gate silicon nanowire architectures an ideal candidate for the study of spin dynamics.
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Affiliation(s)
- A C Betz
- †Hitachi Cambridge Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - R Wacquez
- ‡CEA/LETI-MINATEC, CEA-Grenoble, 17 rue des Martyrs, F-38054 Grenoble, France
| | - M Vinet
- ‡CEA/LETI-MINATEC, CEA-Grenoble, 17 rue des Martyrs, F-38054 Grenoble, France
| | - X Jehl
- §SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, 17 rue des Martyrs, 38054 Grenoble, France
| | - A L Saraiva
- ∥Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, Brazil
| | - M Sanquer
- §SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, 17 rue des Martyrs, 38054 Grenoble, France
| | - A J Ferguson
- ⊥Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
| | - M F Gonzalez-Zalba
- †Hitachi Cambridge Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
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Abstract
We provide here a roadmap for modeling silicon nano-devices with one or two group V donors (D). We discuss systems containing one or two electrons, that is, D(0), D(-), D(+)(2) and D(0)(2) centers. The impact of different levels of approximation is discussed. The most accurate instances--for which we provide quantitative results--are within multivalley effective mass including the central cell correction and a configuration interaction account of the electron-electron correlations. We also derive insightful, yet less accurate, analytical approximations and discuss their validity and limitations--in particular, for a donor pair, we discuss the single orbital LCAO method, the Hückel approximation and the Hubbard model. Finally, we connect these results with recent experiments on devices with few dopants.
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Affiliation(s)
- A L Saraiva
- Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA. Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, Brazil
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Saraiva AL, Payan-Carreira R, Gärtner F, Santana I, Rêma A, Lourenço LM, Pires MA. Immunohistochemical Expression of Cyclooxygenase-2 (COX-2) in Feline Endometrial Adenocarcinoma and in Normal and Hyperplastic Endometria. Reprod Domest Anim 2015; 50:333-340. [DOI: 10.1111/rda.12497] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 01/13/2015] [Indexed: 11/30/2022]
Affiliation(s)
- AL Saraiva
- CECAV; Centro de Ciência Animal e Veterinária; Universidade de Trás-os-Montes e Alto Douro; Quinta de Prados; Vila Real Portugal
- Escola Universitária Vasco da Gama (EUVG); Coimbra Portugal
| | - R Payan-Carreira
- CECAV; Centro de Ciência Animal e Veterinária; Universidade de Trás-os-Montes e Alto Douro; Quinta de Prados; Vila Real Portugal
| | - F Gärtner
- Abel Salazar Institute of Biomedical Sciences (ICBAS); University of Porto; Porto Portugal
- Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP); Porto Portugal
| | - I Santana
- CECAV; Centro de Ciência Animal e Veterinária; Universidade de Trás-os-Montes e Alto Douro; Quinta de Prados; Vila Real Portugal
| | - A Rêma
- Abel Salazar Institute of Biomedical Sciences (ICBAS); University of Porto; Porto Portugal
| | - LM Lourenço
- CECAV; Centro de Ciência Animal e Veterinária; Universidade de Trás-os-Montes e Alto Douro; Quinta de Prados; Vila Real Portugal
| | - MA Pires
- CECAV; Centro de Ciência Animal e Veterinária; Universidade de Trás-os-Montes e Alto Douro; Quinta de Prados; Vila Real Portugal
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Payan-Carreira R, Saraiva AL, Santos T, Vilhena H, Sousa A, Santos C, Pires MA. Feline Endometrial Adenocarcinoma in Females <1 Year Old: A Description of Four Cases. Reprod Domest Anim 2013; 48:e70-7. [DOI: 10.1111/rda.12190] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 05/07/2013] [Indexed: 11/30/2022]
Affiliation(s)
- R Payan-Carreira
- CECAV; University of Trás-os-Montes and Alto Douro; Vila Real; Portugal
| | | | - T Santos
- Veterinary Teaching Hospital (HVUTAD); University of Trás-os-Montes and Alto Douro; Vila Real; Portugal
| | | | - A Sousa
- Policlínica Veterinária d Aveiro - Vetsanus; Aveiro; Portugal
| | - C Santos
- CECAV; University of Trás-os-Montes and Alto Douro; Vila Real; Portugal
| | - MA Pires
- CECAV; University of Trás-os-Montes and Alto Douro; Vila Real; Portugal
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Culcer D, Saraiva AL, Koiller B, Hu X, Das Sarma S. Valley-based noise-resistant quantum computation using Si quantum dots. Phys Rev Lett 2012; 108:126804. [PMID: 22540611 DOI: 10.1103/physrevlett.108.126804] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Indexed: 05/31/2023]
Abstract
We devise a platform for noise-resistant quantum computing using the valley degree of freedom of Si quantum dots. The qubit is encoded in two polarized (1,1) spin-triplet states with different valley compositions in a double quantum dot, with a Zeeman field enabling unambiguous initialization. A top gate gives a difference in the valley splitting between the dots, allowing controllable interdot tunneling between opposite valley eigenstates, which enables one-qubit rotations. Two-qubit operations rely on a stripline resonator, and readout on charge sensing. Sensitivity to charge and spin fluctuations is determined by intervalley processes and is greatly reduced as compared to conventional spin and charge qubits. We describe a valley echo for further noise suppression.
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Affiliation(s)
- Dimitrie Culcer
- ICQD, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
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Gil da Costa RM, Oliveira JP, Saraiva AL, Seixas F, Faria F, Gärtner F, Pires MA, Lopes C. Immunohistochemical Characterization of 13 Canine Renal Cell Carcinomas. Vet Pathol 2010; 48:427-32. [DOI: 10.1177/0300985810381909] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Canine renal cell carcinomas (RCCs) are uncommon aggressive tumors that occur mainly in middle-aged male dogs. Their histologic classification bears no relationship with prognosis, and little information is available concerning their immunohistochemical properties. In this retrospective study, formalin-fixed, paraffin-embedded tissues from 13 canine RCCs were retrieved from the archives, classified histologically, and evaluated immunohistochemically. The dogs were 7 males and 6 females (1 spayed) of 10 different breeds, averaging 8 years in age. The tumors were classified as papillary, tubulopapillary, papillary–cystic, solid, or sarcomatoid. All 13 tumors were immunohistochemically positive for uromodulin, 12 for c-KIT, 11 for vimentin, 9 for wide-spectrum-screening cytokeratins, 7 for cytokeratins AE1/AE3 and carcinoembryonic antigen, 4 for cytokeratins CAM 5.2, and 3 for CD10. All 3 solid RCCs expressed vimentin, c-KIT, and carcinoembryonic antigen and were negative for cytokeratins. All 7 papillary and tubulopapillary tumors expressed vimentin; 6 (86%), cytokeratins; and 6 (86%), c-KIT. Both papillary–cystic RCCs were positive for cytokeratins and c-KIT and negative for vimentin. These results indicate that the different histologic types of RCC have characteristic immunohistochemical profiles and that c-KIT may be involved in the pathogenesis of canine RCC.
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Affiliation(s)
- R. M. Gil da Costa
- Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal
| | - J. P. Oliveira
- CECAV, University of Trás-os-Montes e Alto-Douro, Vila Real, Portugal
| | - A. L. Saraiva
- Gram Laboratório de Anatomia Patológica Veterinária, Maia, Portugal
| | - F. Seixas
- CECAV, University of Trás-os-Montes e Alto-Douro, Vila Real, Portugal
| | - F. Faria
- Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal
| | - F. Gärtner
- Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal
- Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - M. A. Pires
- CECAV, University of Trás-os-Montes e Alto-Douro, Vila Real, Portugal
| | - C. Lopes
- Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Porto, Portugal
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Saraiva AL, Gärtner F, Pires MA. Expression of p63 normal canine skin and primary cutaneous glandular carcinomas. Vet J 2008; 177:136-40. [PMID: 17804265 DOI: 10.1016/j.tvjl.2007.03.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2007] [Revised: 03/24/2007] [Accepted: 03/28/2007] [Indexed: 11/29/2022]
Abstract
p63, a recently identified homologue of the p53 protein, is expressed consistently in basal cells of several human multilayered epithelia. In this study, expression of p63 was determined in 31 primary cutaneous glandular carcinomas, including sebaceous, perianal (hepatoid) gland, apocrine and ceruminous carcinomas, as well as their adjacent normal skin. Similar to humans, p63 is a reliable marker for basal and myoepithelial cells in canine epidermis, cutaneous appendages and malignant apocrine and ceruminous gland neoplasms. In sebaceous carcinomas, not only basal cells, but also some sebocytes, showed nuclear staining for p63. Most mature epithelial cells in perianal gland carcinomas exhibited strong p63 expression. Based on these findings, basal/myoepithelial cells could be involved in the oncogenesis of these tumours and p63 might be used as a diagnostic marker in these lesions.
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Affiliation(s)
- A L Saraiva
- Veterinary Sciences Department, Centre of Animal and Veterinary Sciences (CECAV), Universidade de Trás-os-Montes e Alto Douro (UTAD), 5001-801 Vila Real, Portugal
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