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de Sousa D, Garrido P, Nunes D, Lemos C, Borges-Costa J. Ten Years of HIV Diagnosis in a Dermatology and Venereology Department: A Retrospective Study on Demographic, Clinical, and Laboratory Characteristics. Actas Dermosifiliogr 2024:S0001-7310(24)00357-0. [PMID: 38648929 DOI: 10.1016/j.ad.2024.04.016] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 09/19/2023] [Indexed: 04/25/2024] Open
Abstract
Human immunodeficiency virus (HIV) transmission remains an important health issue, with a high burden that is felt across the world. This work aims to analyze the demographic, clinical, and laboratory characteristics of newly diagnosed patients with HIV in a Department of Dermatology and Venereology. A retrospective observational study was conducted from all health records of newly diagnosed patients with HIV from a Dermatology unit from January 2011 to December 2020. A total of 134 patients with new HIV diagnoses were included in the analysis. Concurrent dermatological or venereal diseases were diagnosed in 91.0% of the patients (n=122), being the most common conditions syphilis (22.4%, n=30) and urethritis (14.9%, n=20). Out of all the patients with diagnoses of concurrent sexually transmitted infection (STI) (41.0%, n=55), syphilis was reported in 81.8% of the patients (n=45), gonorrhea in 9.1% (n=5), and chlamydia in 5.5% (n=3). We present a large patient database on the clinical conditions associated with newly diagnosed HIV, concluding that infectious diseases were the most common conditions associated with newly diagnosed HIV.
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Affiliation(s)
- D de Sousa
- Dermatology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal.
| | - P Garrido
- Dermatology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - D Nunes
- Clinical Pathology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - C Lemos
- Clinical Pathology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - J Borges-Costa
- Dermatology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal; Dermatology Universitary Clinic, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal; Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, Lisbon, Portugal
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de Sousa D, Garrido P, Nunes D, Lemos C, Borges-Costa J. Ten Years of HIV Diagnosis in a Dermatology and Venereology Department: A Retrospective Study on Demographic, Clinical, and Laboratory Characteristics. Actas Dermosifiliogr 2024:S0001-7310(24)00053-X. [PMID: 38311223 DOI: 10.1016/j.ad.2023.09.024] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 09/13/2023] [Accepted: 09/19/2023] [Indexed: 02/10/2024] Open
Abstract
Human immunodeficiency virus (HIV) transmission remains an important health issue, with a high burden that is felt across the world. This work aims to analyze the demographic, clinical, and laboratory characteristics of newly diagnosed patients with HIV in a Department of Dermatology and Venereology. A retrospective observational study was conducted from all health records of newly diagnosed patients with HIV from a Dermatology unit from January 2011 to December 2020. A total of 134 patients with new HIV diagnoses were included in the analysis. Concurrent dermatological or venereal diseases were diagnosed in 91.0% of the patients (n=122), being the most common conditions syphilis (22.4%, n=30) and urethritis (14.9%, n=20). Out of all the patients with diagnoses of concurrent sexually transmitted infection (STI) (41.0%, n=55), syphilis was reported in 81.8% of the patients (n=45), gonorrhea in 9.1% (n=5), and chlamydia in 5.5% (n=3). We present a large patient database on the clinical conditions associated with newly diagnosed HIV, concluding that infectious diseases were the most common conditions associated with newly diagnosed HIV.
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Affiliation(s)
- D de Sousa
- Dermatology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal.
| | - P Garrido
- Dermatology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - D Nunes
- Clinical Pathology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - C Lemos
- Clinical Pathology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - J Borges-Costa
- Dermatology Department, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal; Dermatology Universitary Clinic, Faculdade de Medicina da Universidade de Lisboa, Lisbon, Portugal; Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, Lisbon, Portugal
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Ferreira-Gonçalves T, Nunes D, Fortunato E, Martins R, de Almeida AP, Carvalho L, Ferreira D, Catarino J, Faísca P, Ferreira HA, Gaspar MM, Coelho JMP, Reis CP. Rational approach to design gold nanoparticles for photothermal therapy: the effect of gold salt on physicochemical, optical and biological properties. Int J Pharm 2024; 650:123659. [PMID: 38042383 DOI: 10.1016/j.ijpharm.2023.123659] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 11/27/2023] [Accepted: 11/28/2023] [Indexed: 12/04/2023]
Abstract
Among the unique characteristics associated to gold nanoparticles (AuNPs) in biomedicine, their ability to convert light energy into heat opens ventures for improved cancer therapeutic options, such as photothermal therapy (PTT). PTT relies on the local hyperthermia of tumor cells upon irradiation with light beams, and the association of AuNPs with radiation within the near infrared (NIR) range constitutes an advantageous strategy to potentially improve PTT efficacy. Herein, it was explored the effect of the gold salt on the AuNPs' physicochemical and optical properties. Mostly spherical-like negatively charged AuNPs with variable sizes and absorbance spectra were obtained. In addition, photothermal features were assessed using in vitro phantom models. The best formulation showed the ability to increase their temperature in aqueous solution up to 19 °C when irradiated with a NIR laser for 20 min. Moreover, scanning transmission electron microscopy confirmed the rearrangement of the gold atoms in a face-centered cubic structure, which further allowed to calculate the photothermal conversion efficiency upon combination of theoretical and experimental data. AuNPs also showed local retention after being locally administered in in vivo models. These last results obtained by computerized tomography allow to consider these AuNPs as promising elements for a PTT system. Moreover, AuNPs showed high potential for PTT by resulting in in vitro cancer cells' viability reductions superior to 70 % once combine with 5 min of NIR irradiation.
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Affiliation(s)
- Tânia Ferreira-Gonçalves
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal; Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
| | - Daniela Nunes
- Department of Materials Science, NOVA School of Science and Technology, Campus de Caparica, i3N/CENIMAT, 2829-516 Caparica, Portugal.
| | - Elvira Fortunato
- Department of Materials Science, NOVA School of Science and Technology, Campus de Caparica, i3N/CENIMAT, 2829-516 Caparica, Portugal.
| | - Rodrigo Martins
- Department of Materials Science, NOVA School of Science and Technology, Campus de Caparica, i3N/CENIMAT, 2829-516 Caparica, Portugal.
| | - António P de Almeida
- Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. Universidade Técnica, 1300-477 Lisboa, Portugal.
| | - Lina Carvalho
- Central Testing Laboratory, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| | - David Ferreira
- Comprehensive Health Research Centre (CHRC), Departamento de Medicina Veterinária, Escola de Ciências e Tecnologia, Universidade de Évora, Pólo da Mitra, Ap. 94, 7002-594 Valverde, Évora, Portugal.
| | - José Catarino
- Faculdade de Medicina Veterinária, Universidade Lusófona de Humanidades e Tecnologias, Campo Grande 376, 1749-024 Lisboa, Portugal.
| | - Pedro Faísca
- Faculdade de Medicina Veterinária, Universidade Lusófona de Humanidades e Tecnologias, Campo Grande 376, 1749-024 Lisboa, Portugal; CBIOS-Research Center for Biosciences & Health Technologies, Universidade Lusófona de Humanidades e Tecnologias, Campo Grande 376, 1749-024 Lisboa, Portugal.
| | - Hugo A Ferreira
- Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
| | - M Manuela Gaspar
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal.
| | - João M P Coelho
- Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
| | - Catarina Pinto Reis
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisboa, Portugal; Instituto de Biofísica e Engenharia Biomédica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
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Matias ML, Reis-Machado AS, Rodrigues J, Calmeiro T, Deuermeier J, Pimentel A, Fortunato E, Martins R, Nunes D. Microwave Synthesis of Visible-Light-Activated g-C 3N 4/TiO 2 Photocatalysts. Nanomaterials (Basel) 2023; 13:1090. [PMID: 36985984 PMCID: PMC10057508 DOI: 10.3390/nano13061090] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 03/11/2023] [Accepted: 03/13/2023] [Indexed: 06/18/2023]
Abstract
The preparation of visible-light-driven photocatalysts has become highly appealing for environmental remediation through simple, fast and green chemical methods. The current study reports the synthesis and characterization of graphitic carbon nitride/titanium dioxide (g-C3N4/TiO2) heterostructures through a fast (1 h) and simple microwave-assisted approach. Different g-C3N4 amounts mixed with TiO2 (15, 30 and 45 wt. %) were investigated for the photocatalytic degradation of a recalcitrant azo dye (methyl orange (MO)) under solar simulating light. X-ray diffraction (XRD) revealed the anatase TiO2 phase for the pure material and all heterostructures produced. Scanning electron microscopy (SEM) showed that by increasing the amount of g-C3N4 in the synthesis, large TiO2 aggregates composed of irregularly shaped particles were disintegrated and resulted in smaller ones, composing a film that covered the g-C3N4 nanosheets. Scanning transmission electron microscopy (STEM) analyses confirmed the existence of an effective interface between a g-C3N4 nanosheet and a TiO2 nanocrystal. X-ray photoelectron spectroscopy (XPS) evidenced no chemical alterations to both g-C3N4 and TiO2 at the heterostructure. The visible-light absorption shift was indicated by the red shift in the absorption onset through the ultraviolet-visible (UV-VIS) absorption spectra. The 30 wt. % of g-C3N4/TiO2 heterostructure showed the best photocatalytic performance, with a MO dye degradation of 85% in 4 h, corresponding to an enhanced efficiency of almost 2 and 10 times greater than that of pure TiO2 and g-C3N4 nanosheets, respectively. Superoxide radical species were found to be the most active radical species in the MO photodegradation process. The creation of a type-II heterostructure is highly suggested due to the negligible participation of hydroxyl radical species in the photodegradation process. The superior photocatalytic activity was attributed to the synergy of g-C3N4 and TiO2 materials.
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Affiliation(s)
- Maria Leonor Matias
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal
| | - Ana S. Reis-Machado
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Joana Rodrigues
- Physics Department & I3N, Aveiro University, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Tomás Calmeiro
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal
| | - Jonas Deuermeier
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal
| | - Ana Pimentel
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal
| | - Elvira Fortunato
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal
| | - Rodrigo Martins
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal
| | - Daniela Nunes
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal
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Matias ML, Pimentel A, Reis-Machado AS, Rodrigues J, Deuermeier J, Fortunato E, Martins R, Nunes D. Enhanced Fe-TiO 2 Solar Photocatalysts on Porous Platforms for Water Purification. Nanomaterials (Basel) 2022; 12:1005. [PMID: 35335818 PMCID: PMC8955547 DOI: 10.3390/nano12061005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 03/14/2022] [Accepted: 03/16/2022] [Indexed: 02/04/2023]
Abstract
In this study, polyethylene glycol-modified titanium dioxide (PEG-modified TiO2) nanopowders were prepared using a fast solvothermal method under microwave irradiation, and without any further calcination processes. These nanopowders were further impregnated on porous polymeric platforms by drop-casting. The effect of adding iron with different molar ratios (1, 2, and 5%) of iron precursor was investigated. The characterization of the produced materials was carried out by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Optical characterization of all the materials was also carried out. SEM showed that pure TiO2 and Fe-TiO2 nanostructures presented similar nanosized and spherical particles, which uniformly covered the substrates. From XRD, pure TiO2 anatase was obtained for all nanopowders produced, which was further confirmed by Raman spectroscopy on the impregnated substrates. XPS and UV-VIS absorption spectroscopy emission spectra revealed that the presence of Fe ions on the Fe-TiO2 nanostructures led to the introduction of new intermediate energy levels, as well as defects that contributed to an enhancement in the photocatalytic performance. The photocatalytic results under solar radiation demonstrated increased photocatalytic activity in the presence of the 5% Fe-TiO2 nanostructures (Rhodamine B degradation of 85% after 3.5 h, compared to 74% with pure TiO2 for the same exposure time). The photodegradation rate of RhB dye with the Fe-TiO2 substrate was 1.5-times faster than pure TiO2. Reusability tests were also performed. The approach developed in this work originated novel functionalized photocatalytic platforms, which were revealed to be promising for the removal of organic dyes from wastewater.
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Affiliation(s)
- Maria Leonor Matias
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal; (M.L.M.); (A.P.); (J.D.); (E.F.)
| | - Ana Pimentel
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal; (M.L.M.); (A.P.); (J.D.); (E.F.)
| | - Ana S. Reis-Machado
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal;
| | - Joana Rodrigues
- Physics Department & I3N, Aveiro University, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;
| | - Jonas Deuermeier
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal; (M.L.M.); (A.P.); (J.D.); (E.F.)
| | - Elvira Fortunato
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal; (M.L.M.); (A.P.); (J.D.); (E.F.)
| | - Rodrigo Martins
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal; (M.L.M.); (A.P.); (J.D.); (E.F.)
| | - Daniela Nunes
- CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal; (M.L.M.); (A.P.); (J.D.); (E.F.)
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Freire T, Fragoso AR, Matias M, Pinto JV, Marques AC, Pimentel A, Barquinha P, Huertas R, Fortunato E, Martins R, Nunes D. Enhanced solar photocatalysis of TiO2 nanoparticles and nanostructured thin films grown on paper. Nano Ex 2021. [DOI: 10.1088/2632-959x/abed40] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Titanium dioxide nanoparticles and nanostructured thin films were simultaneously synthesized using a microwave-assisted hydrothermal method. The synthesis formed very fine particles, appearing as nanospheres in the 11 nm size range. As for the nanostructured films, they have displayed similar structural characteristics to the nanoparticles, with thickness of 130 nm. These films covered uniformly and homogenously the Whatman paper, while maintaining its flexibility. The materials processed had their photocatalytic activity assessed from rhodamine B degradation under solar radiation (91% degradation after 40 min for the powder material and 68% after 6 h for the nanostructured thin films). Reusability experiments were also carried out, revealing superior performance concerning the Degussa P25, the most common photocatalyst used. The results of the present work can be thought as an option for the existing photocatalysts activated under solar light, namely for water purification, as it simultaneously produces enhanced photocatalytic powders and photocatalytic papers fully disposable and that can be easily recycled.
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Nunes D, Rocha T, Traver V, Teixeira C, Ruano M, Paredes S, Carvalho P, Henriques J. Latent states extraction through Kalman Filter for the prediction of heart failure decompensation events. Annu Int Conf IEEE Eng Med Biol Soc 2020; 2019:3947-3950. [PMID: 31946736 DOI: 10.1109/embc.2019.8857591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Cardiac function deterioration of heart failure patients is frequently manifested by the occurrence of decompensation events. One relevant step to adequately prevent cardiovascular status degradation is to predict decompensation episodes in order to allow preventive medical interventions.In this paper we introduce a methodology with the goal of finding onsets of worsening progressions from multiple physiological parameters which may have predictive value in decompensation events. The best performance was obtained for the model composed by only two features using a telemonitoring dataset (myHeart) with 41 patients. Results were achieved by applying leave-one-subject-out validation and correspond to a geometric mean of 83.67%. The obtained performance suggests that the methodology has the potential to be used in decision support solutions and assist in the prevention of this public health burden.
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Oliveira MJ, P de Almeida M, Nunes D, Fortunato E, Martins R, Pereira E, J Byrne H, Águas H, Franco R. Design and Simple Assembly of Gold Nanostar Bioconjugates for Surface-Enhanced Raman Spectroscopy Immunoassays. Nanomaterials (Basel) 2019; 9:nano9111561. [PMID: 31689919 PMCID: PMC6915668 DOI: 10.3390/nano9111561] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 10/15/2019] [Revised: 10/24/2019] [Accepted: 10/30/2019] [Indexed: 01/15/2023]
Abstract
Immunoassays using Surface-Enhanced Raman Spectroscopy are especially interesting on account not only of their increased sensitivity, but also due to its easy translation to point-of-care formats. The bases for these assays are bioconjugates of polyclonal antibodies and anisotropic gold nanoparticles functionalized with a Raman reporter. These bioconjugates, once loaded with the antigen analyte, can react on a sandwich format with the same antibodies immobilized on a surface. This surface can then be used for detection, on a microfluidics or immunochromatographic platform. Here, we have assembled bioconjugates of gold nanostars functionalized with 4-mercaptobenzoic acid, and anti-horseradish peroxidase antibodies. The assembly was by simple incubation, and agarose gel electrophoresis determined a high gold nanostar to antibody binding constant. The functionality of the bioconjugates is easy to determine since the respective antigen presents peroxidase enzymatic activity. Furthermore, the chosen antibody is a generic immunoglobulin G (IgG) antibody, opening the application of these principles to other antibody-antigen systems. Surface-Enhanced Raman Spectroscopy analysis of these bioconjugates indicated antigen detection down to 50 µU of peroxidase activity. All steps of conjugation were fully characterized by ultraviolet-visible spectroscopy, dynamic light scattering, ζ -Potential, scanning electron microscopy, and agarose gel electrophoresis. Based on the latter technique, a proof-of-concept was established for the proposed immunoassay.
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Affiliation(s)
- Maria João Oliveira
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.
- CENIMAT-I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Miguel P de Almeida
- REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, 4169-007 Porto, Portugal.
| | - Daniela Nunes
- CENIMAT-I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Elvira Fortunato
- CENIMAT-I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Rodrigo Martins
- CENIMAT-I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Eulália Pereira
- REQUIMTE/LAQV, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, 4169-007 Porto, Portugal.
| | - Hugh J Byrne
- FOCAS Research Institute, Technological University Dublin, Kevin Street, Dublin 8, Ireland.
| | - Hugo Águas
- CENIMAT-I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
| | - Ricardo Franco
- UCIBIO, REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.
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Alves-Barroco C, Roma-Rodrigues C, Balasubramanian N, Guimarães MA, Ferreira-Carvalho BT, Muthukumaran J, Nunes D, Fortunato E, Martins R, Santos-Silva T, Figueiredo AMS, Fernandes AR, Santos-Sanches I. Biofilm development and computational screening for new putative inhibitors of a homolog of the regulatory protein BrpA in Streptococcus dysgalactiae subsp. dysgalactiae. Int J Med Microbiol 2019; 309:169-181. [PMID: 30799091 DOI: 10.1016/j.ijmm.2019.02.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [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: 08/11/2018] [Revised: 02/14/2019] [Accepted: 02/17/2019] [Indexed: 01/15/2023] Open
Abstract
Streptococcus dysgalactiae subsp. dysgalactiae (SDSD), a Lancefield group C streptococci (GCS), is a frequent cause of bovine mastitis. This highly prevalent disease is the costliest in dairy industry. Adherence and biofilm production are important factors in streptoccocal pathogenesis. We have previously described the adhesion and internalization of SDSD isolates in human cells and now we describe the biofilm production capability of this bacterium. In this work we integrated microbiology, imaging and computational methods to evaluate the biofilm production capability of SDSD isolates; to assess the presence of biofilm regulatory protein BrpA homolog in the biofilm producers; and to predict a structural model of BrpA-like protein and its binding to putative inhibitors. Our results show that SDSD isolates form biofilms on abiotic surface such as glass (hydrophilic) and polystyrene (hydrophobic), with the strongest biofilm formation observed in glass. This ability was mainly associated with a proteinaceous extracellular matrix, confirmed by the dispersion of the biofilms after proteinase K and trypsin treatment. The biofilm formation in SDSD isolates was also confirmed by confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Under SEM observation, VSD16 isolate formed cell aggregates during biofilm growth while VSD9 and VSD10 formed smooth and filmy layers. We show that brpA-like gene is present and expressed in SDSD biofilm-producing isolates and its expression levels correlated with the biofilm production capability, being more expressed in the late exponential phase of planktonic growth compared to biofilm growth. Fisetin, a known biofilm inhibitor and a putative BrpA binding molecule, dramatically inhibited biofilm formation by the SDSD isolates but did not affect planktonic growth, at the tested concentrations. Homology modeling was used to predict the 3D structure of BrpA-like protein. Using high throughput virtual screening and molecular docking, we selected five ligand molecules with strong binding affinity to the hydrophobic cleft of the protein, making them potential inhibitor candidates of the SDSD BrpA-like protein. These results warrant further investigations for developing novel strategies for SDSD anti-biofilm therapy.
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Affiliation(s)
- Cinthia Alves-Barroco
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
| | - Catarina Roma-Rodrigues
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
| | - Natesan Balasubramanian
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal; Department of Immunology, School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, India
| | | | | | - Jayaraman Muthukumaran
- UCIBIO, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
| | - Daniela Nunes
- i3N/CENIMAT, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, Caparica, Portugal
| | - Elvira Fortunato
- i3N/CENIMAT, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, Caparica, Portugal
| | - Rodrigo Martins
- i3N/CENIMAT, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, Caparica, Portugal
| | - Teresa Santos-Silva
- UCIBIO, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal.
| | - Agnes M S Figueiredo
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, RJ, Brazil.
| | - Alexandra R Fernandes
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal.
| | - Ilda Santos-Sanches
- UCIBIO, Departamento de Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
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10
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Nunes D, Pimentel A, Matias M, Freire T, Araújo A, Silva F, Gaspar P, Garcia S, Carvalho PA, Fortunato E, Martins R. Tailoring Upconversion and Morphology of Yb/Eu Doped Y₂O₃ Nanostructures by Acid Composition Mediation. Nanomaterials (Basel) 2019; 9:nano9020234. [PMID: 30744111 PMCID: PMC6410257 DOI: 10.3390/nano9020234] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [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: 12/29/2018] [Revised: 01/23/2019] [Accepted: 02/04/2019] [Indexed: 11/16/2022]
Abstract
The present study reports the production of upconverter nanostructures composed by a yttrium oxide host matrix co-doped with ytterbium and europium, i.e., Y2O3:Yb3+/Eu3+. These nanostructures were formed through the dissociation of yttrium, ytterbium and europium oxides using acetic, hydrochloric and nitric acids, followed by a fast hydrothermal method assisted by microwave irradiation and subsequent calcination process. Structural characterization has been carried out by X-ray diffraction (XRD), scanning transmission electron microscopy (STEM) and scanning electron microscopy (SEM) both coupled with energy dispersive X-ray spectroscopy (EDS). The acid used for dissociation of the primary oxides played a crucial role on the morphology of the nanostructures. The acetic-based nanostructures resulted in nanosheets in the micrometer range, with thickness of around 50 nm, while hydrochloric and nitric resulted in sphere-shaped nanostructures. The produced nanostructures revealed a homogeneous distribution of the doping elements. The thermal behaviour of the materials has been investigated with in situ X-Ray diffraction and differential scanning calorimetry (DSC) experiments. Moreover, the optical band gaps of all materials were determined from diffuse reflectance spectroscopy, and their photoluminescence behaviour has been accessed showing significant differences depending on the acid used, which can directly influence their upconversion performance.
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Affiliation(s)
- Daniela Nunes
- i3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Ana Pimentel
- i3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Mariana Matias
- i3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Tomás Freire
- i3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, Caparica 2829-516, Portugal.
| | - A Araújo
- INCM, Imprensa Nacional-Casa da Moeda, Av. António José de Almeida, 1000-042 Lisboa, Portugal.
| | - Filipe Silva
- INCM, Imprensa Nacional-Casa da Moeda, Av. António José de Almeida, 1000-042 Lisboa, Portugal.
| | - Patrícia Gaspar
- INCM, Imprensa Nacional-Casa da Moeda, Av. António José de Almeida, 1000-042 Lisboa, Portugal.
| | - Silvia Garcia
- INCM, Imprensa Nacional-Casa da Moeda, Av. António José de Almeida, 1000-042 Lisboa, Portugal.
| | | | - Elvira Fortunato
- i3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Rodrigo Martins
- i3N/CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP/UNINOVA, Campus de Caparica, Caparica 2829-516, Portugal.
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11
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Nunes D, Leal A, Rocha T, Traver V, Teixeira C, Ruano M, Paredes S, Carvalho P, Henriques J. Risk Prediction of Heart Failure Decompensation Events in Multiparametric Feature Spaces. Annu Int Conf IEEE Eng Med Biol Soc 2018; 2018:4030-4033. [PMID: 30441241 DOI: 10.1109/embc.2018.8513096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Cardiac function deterioration of heart failure patients is frequently manifested by the occurrence of decompensation events. One relevant step to adequately prevent cardiovascular status degradation is to predict decompensation episodes in order to allow preventive medical interventions. In this paper we introduce a methodology with the goal of finding relevant feature spaces from multiple physiological parameters which may have predictive value in decompensation events. The best performance was obtained for the feature space comprising the following features: mean weight, standard deviation of the blood pressure and mean of extra-thoracic impedance in a time window of 20 days. Results were achieved by applying leave-one-out validation and correspond to a geometric mean of 88.32%. The obtained performance suggests that the methodology has the potential to be used in decision support solutions and assist in the prevention of this public health burden.
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12
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Rovisco A, Branquinho R, Martins J, Oliveira MJ, Nunes D, Fortunato E, Martins R, Barquinha P. Seed-Layer Free Zinc Tin Oxide Tailored Nanostructures for Nanoelectronic Applications: Effect of Chemical Parameters. ACS Appl Nano Mater 2018; 1:3986-3997. [PMID: 30294718 PMCID: PMC6166637 DOI: 10.1021/acsanm.8b00743] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 07/20/2018] [Indexed: 05/27/2023]
Abstract
Semiconductor nanowires are mostly processed by complex, expensive, and high temperature methods. In this work, with the intent of developing zinc tin oxide nanowires (ZTO NWs) by low-cost and low-complexity processes, we show a detailed study on the influence of chemical parameters in the hydrothermal synthesis of ZTO nanostructures at temperatures of only 200 °C. Two different zinc precursors, the ratio between zinc and tin precursors, and the concentration of the surfactant agent and of the mineralizer were studied. The type and the crystallinity of the nanostructures were found to be highly dependent on the used precursors and on the concentration of each reagent. Conditions for obtaining different ZTO nanostructures were achieved, namely, Zn2SnO4 nanoparticles and ZnSnO3 nanowires with length ∼600 nm, with the latter being reported for the first time ever by hydrothermal methods without the use of seed layers. Optical and electrical properties were analyzed, obtaining band gaps of 3.60 and 3.46 eV for ZnSnO3 and Zn2SnO4, respectively, and a resistivity of 1.42 kΩ·cm for single ZnSnO3 nanowires, measured using nanomanipulators after localized deposition of Pt electrodes by e-beam assisted gas decomposition. The low-temperature hydrothermal methods explored here proved to be a low-cost, reproducible, and highly flexible route to obtain multicomponent oxide nanostructures, particularly ZTO NWs. The diversity of the synthesized ZTO structures has potential application in next-generation nanoscale devices such as field effect nanotransistors, nanogenerators, resistive switching memories, gas sensors, and photocatalysis.
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13
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Nunes D, Bautin N, Perez T, Lerouzic O, Chenivesse C. Impact du syndrome d’hyperventilation sur la productivité au travail. Rev Mal Respir 2018. [DOI: 10.1016/j.rmr.2017.10.160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Nunes D, Dansin E, Wasielewski E, Descarpentries C, Grégoire V, Copin M, Escande F, Cortot A. Rebiopsies solides et liquides chez les patients atteints d’un cancer bronchopulmonaire non à petites cellules EGFR mutés. Rev Mal Respir 2018. [DOI: 10.1016/j.rmr.2017.10.217] [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: 11/28/2022]
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15
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Nunes D, Dansin E, Lamblin C, Wasielewski E, Descarpentries C, Grégoire V, Copin M, Escande F, Cortot A. P3.02-002 Liquid and Solid Rebiopsies in EGFR-Mutated NSCLC Patients. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1531] [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: 11/29/2022]
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16
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Nunes D, Carvalho P, Henriques J, Teixeira C. Pattern discovery and similarity assessment for robust heart sound segmentation. Annu Int Conf IEEE Eng Med Biol Soc 2017; 2017:2582-2585. [PMID: 29060427 DOI: 10.1109/embc.2017.8037385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Heart Sound Segmentation plays a fundamental role in pathology detection in Phonocardiogram (PCG) signals. This matter of study has been widely studied in the past decades, however the majority of algorithms' results correspond only to small databases, composed by only quality signals or signals specific to one acquisition system. In this work we proposed a robust segmentation algorithm integrated with clinical information, based on a pattern recognition approach for segmentation of the fundamental heart sounds, which is validated in several databases from different countries and with different acquisition instrumentations. The database comprises a total of 3153 recordings from 764 patients with a variety of pathological conditions. The general results were 95% and 96% of sensitivity and positive predictivity, respectively. Based on the results the algorithm is able to perform with accuracy maintaining generalization capabilities.
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17
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Nunes D, Carvalho P, Henriques J, Ruano MG, Teixeira C. Pattern discovery and similarity assessment for robust Heart Sound Segmentation. Annu Int Conf IEEE Eng Med Biol Soc 2017; 2017:3517-3520. [PMID: 29060656 DOI: 10.1109/embc.2017.8037615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Heart Sound Segmentation plays a fundamental role in pathology detection in Phonocardiogram (PCG) signals. This matter of study has been widely studied in the past decades, however the majority of algorithms' results correspond only to small databases, composed by only quality signals or signals specific to one acquisition system. In this work we proposed a robust segmentation algorithm integrated with clinical information, based on a pattern recognition approach for segmentation of the fundamental heart sounds, which is validated in several databases from different countries and with different acquisition instrumentations. The database comprises a total of 3153 recordings from 764 patients with a variety of pathological conditions. The general results were 95% and 96% of sensitivity and positive predictivity, respectively. Based on the results the algorithm is able to perform with accuracy maintaining generalization capabilities.
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18
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Panigrahi S, Jana S, Calmeiro T, Nunes D, Martins R, Fortunato E. Imaging the Anomalous Charge Distribution Inside CsPbBr 3 Perovskite Quantum Dots Sensitized Solar Cells. ACS Nano 2017; 11:10214-10221. [PMID: 28956909 DOI: 10.1021/acsnano.7b04762] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Highly luminescent CsPbBr3 perovskite quantum dots (QDs) have gained huge attention in research due to their various applications in optoelectronics, including as a light absorber in photovoltaic solar cells. To improve the performances of such devices, it requires a deeper knowledge on the charge transport dynamics inside the solar cell, which are related to its power-conversion efficiency. Here, we report the successful fabrication of an all-inorganic CsPbBr3 perovskite QD sensitized solar cell and the imaging of anomalous electrical potential distribution across the layers of the cell under different illuminations using Kelvin probe force microscopy. Carrier generation, separation, and transport capacity inside the cells are dependent on the light illumination. Large differences in surface potential between electron and hole transport layers with unbalanced carrier separation at the junction have been observed under white light (full solar spectrum) illumination. However, under monochromatic light (single wavelength of solar spectrum) illumination, poor charge transport occurred across the junction as a consequence of less difference in surface potential between the active layers. The outcome of this study provides a clear idea on the carrier dynamic processes inside the cells and corresponding surface potential across the layers under the illumination of different wavelengths of light to understand the functioning of the solar cells and ultimately for the improvement of their photovoltaic performances.
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Affiliation(s)
- Shrabani Panigrahi
- CENIMAT/i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , Campus de Caparica, 2829-516 Caparica, Portugal
| | - Santanu Jana
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay , 91405 Cedex Orsay, France
| | - Tomás Calmeiro
- CENIMAT/i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , Campus de Caparica, 2829-516 Caparica, Portugal
| | - Daniela Nunes
- CENIMAT/i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , Campus de Caparica, 2829-516 Caparica, Portugal
| | - Rodrigo Martins
- CENIMAT/i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , Campus de Caparica, 2829-516 Caparica, Portugal
| | - Elvira Fortunato
- CENIMAT/i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , Campus de Caparica, 2829-516 Caparica, Portugal
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19
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Lourenço SC, Torres CAV, Nunes D, Duarte P, Freitas F, Reis MAM, Fortunato E, Moldão-Martins M, da Costa LB, Alves VD. Using a bacterial fucose-rich polysaccharide as encapsulation material of bioactive compounds. Int J Biol Macromol 2017; 104:1099-1106. [PMID: 28687391 DOI: 10.1016/j.ijbiomac.2017.07.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [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: 02/15/2017] [Revised: 06/06/2017] [Accepted: 07/03/2017] [Indexed: 12/11/2022]
Abstract
The potential of a bacterial exopolysaccharide named FucoPol, produced by the bacterium Enterobacter A47, as encapsulation matrix was explored. Spherical capsules with a smooth surface were produced by spray drying. The obtained microcapsules had average diameters ranging from 0.5 to 26.7μm and presented thin walls (thickness from 222 to 1094nm). The capsules were loaded with two bioactive compounds: gallic acid (GA) and oregano essential oil (OEO). Both bioactive materials were encapsulated in FucoPol particles, retaining their antioxidant activity after the drying process. Release studies showed that GA release in simulated gastric and intestinal fluids was faster than that of OEO, envisaging that the latter had established stronger interactions with the polymer matrix. These results suggest that FucoPol has a good potential for use as encapsulating material of bioactive compounds for application in several areas, including food, cosmetic or pharmaceutical products.
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Affiliation(s)
- Sofia C Lourenço
- LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisbon, Portugal.
| | - Cristiana A V Torres
- UCIBIO-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
| | - Daniela Nunes
- CENIMAT/i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP-UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal.
| | - Paulo Duarte
- CENIMAT/i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP-UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal.
| | - Filomena Freitas
- UCIBIO-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
| | - Maria A M Reis
- UCIBIO-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
| | - Elvira Fortunato
- CENIMAT/i3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP-UNINOVA, Campus de Caparica, 2829-516 Caparica, Portugal.
| | - Margarida Moldão-Martins
- LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisbon, Portugal.
| | - Luísa Beirão da Costa
- LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisbon, Portugal.
| | - Vítor D Alves
- LEAF, Linking Landscape, Environment, Agriculture and Food, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisbon, Portugal.
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20
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Nunes D, Brito T, Alexandre T, Corona L, Duarte Y, Lebrao M. DETERMINANTS OF THE NEED TO CARE FOR ELDERLY BRAZILIANS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1292] [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: 11/12/2022] Open
Affiliation(s)
- D. Nunes
- Nursing, Federal University of Tocantins, Palmas, Tocantins, Brazil,
| | - T. Brito
- University of São Paulo, SãoPaulo, Brazil,
| | | | | | - Y. Duarte
- University of São Paulo, SãoPaulo, Brazil,
| | - M. Lebrao
- University of São Paulo, SãoPaulo, Brazil,
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21
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Brito T, Nunes D, Corona L, Alexandre T, Duarte Y, Lebrao M. SOCIAL SUPPORT AND EMERGENCE OF FUNCTIONAL IMPAIRMENT: SABE STUDY EVIDENCES. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4757] [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: 11/15/2022] Open
Affiliation(s)
- T. Brito
- Federal University of Alfenas, Minas Gerais, Brazil
| | - D. Nunes
- Federal University of Tocantins, Palmas, Brazil,
| | | | | | - Y. Duarte
- University of São Paulo, São Paulo, Brazil,
| | - M. Lebrao
- University of São Paulo, São Paulo, Brazil,
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22
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Corona L, Saron A, Nunes D, Alexandre T, Brito T, Duarte Y, Lebrao M. CONCORDANCE OF ANTHROPOMETRIC, SELF-REPORTED AND BLOOD MEASURES OF NUTRITIONAL EVALUATION IN ELDERLY. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.1940] [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: 11/12/2022] Open
Affiliation(s)
- L.P. Corona
- Faculty of Applied Scientes, University of Campinas, Limeira, Sao Paulo, Brazil,
| | - A. Saron
- Faculty of Applied Scientes, University of Campinas, Limeira, Sao Paulo, Brazil,
| | - D. Nunes
- Federal University of Tocantins, Palmas, Tocantins, Brazil,
| | - T. Alexandre
- Federal University of São Carlos, Sao Carlos, Sao Paulo, Brazil,
| | - T. Brito
- University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Y. Duarte
- University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - M. Lebrao
- University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
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23
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Panigrahi S, Nunes D, Calmeiro T, Kardarian K, Martins R, Fortunato E. Oxide-Based Solar Cell: Impact of Layer Thicknesses on the Device Performance. ACS Comb Sci 2017; 19:113-120. [PMID: 27992163 DOI: 10.1021/acscombsci.6b00154] [Citation(s) in RCA: 19] [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] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A ZnO/Cu2O-based combinatorial heterojunction device library was successfully fabricated by a simple spray pyrolysis technique using ITO-coated glass as the substrate. The combinatorial approach was introduced to analyze the impact of the ZnO and Cu2O layer thicknesses on the performance of the solar cells. The thickness of the ZnO layer was varied from ∼50 to 320 nm, and the Cu2O layer was deposited orthogonal to the ZnO thickness gradient. In the case of Cu2O, the thickness varied from ∼200 to 800 nm. The photovoltaic performance of the cells is strongly dependent on the absorber layer thickness for a particular window layer thickness and reaches a maximum short-circuit current density of 3.9 mA/cm2 when the absorber layer thickness just crosses ∼700 nm. Reducing the thicknesses of the active layers leads to a sharp decrease in the device performance. It is shown that the entire built-in bias of the heterojunction is created in the absorber layer due to low carrier density. The poor performance of the devices having lower thicknesses is attributed to different interfacial phenomena such as optical losses due to the thin Cu2O layer, back-contact recombination of the carriers due to the low layer thickness because a minimum heterojunction thickness is required for the formation of the full built-in bias that slows down the recombination of the carriers, and other factors.
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Affiliation(s)
- Shrabani Panigrahi
- i3N/CENIMAT, Department
of
Materials Science, Faculty of Sciences and Technology, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Daniela Nunes
- i3N/CENIMAT, Department
of
Materials Science, Faculty of Sciences and Technology, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Tomás Calmeiro
- i3N/CENIMAT, Department
of
Materials Science, Faculty of Sciences and Technology, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Kasra Kardarian
- i3N/CENIMAT, Department
of
Materials Science, Faculty of Sciences and Technology, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Rodrigo Martins
- i3N/CENIMAT, Department
of
Materials Science, Faculty of Sciences and Technology, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
| | - Elvira Fortunato
- i3N/CENIMAT, Department
of
Materials Science, Faculty of Sciences and Technology, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
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24
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Nunes D, Nogueira C, Lopes A, Chaves P, Rodrigues E, Cardoso T, Leão Teles E, Vilarinho L. LPIN1 deficiency: A novel mutation associated with different phenotypes in the same family. Mol Genet Metab Rep 2016; 9:29-30. [PMID: 27722093 PMCID: PMC5050266 DOI: 10.1016/j.ymgmr.2016.09.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 09/16/2016] [Indexed: 11/19/2022] Open
Affiliation(s)
- D Nunes
- Newborn Screening, Metabolism & Genetics Unit, Genetics Department, National Institute of Health, INSA, Porto, Portugal
| | - C Nogueira
- Newborn Screening, Metabolism & Genetics Unit, Genetics Department, National Institute of Health, INSA, Porto, Portugal
| | - A Lopes
- Newborn Screening, Metabolism & Genetics Unit, Genetics Department, National Institute of Health, INSA, Porto, Portugal
| | - P Chaves
- Metabolic Unit, CHSJ, Porto, Portugal
| | | | - T Cardoso
- Metabolic Unit, CHSJ, Porto, Portugal
| | | | - L Vilarinho
- Newborn Screening, Metabolism & Genetics Unit, Genetics Department, National Institute of Health, INSA, Porto, Portugal
- Corresponding author at: Genetics Department, National Institute of Health, INSA, Porto, Portugal, Rua Alexandre Herculano, 321, 4000-055, Porto, Portugal.Genetics DepartmentNational Institute of HealthINSA, Porto, PortugalRua Alexandre Herculano, 321Porto4000-055Portugal
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25
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Panigrahi S, Calmeiro T, Martins R, Nunes D, Fortunato E. Observation of Space Charge Dynamics Inside an All Oxide Based Solar Cell. ACS Nano 2016; 10:6139-6146. [PMID: 27244449 DOI: 10.1021/acsnano.6b02090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The charge transfer dynamics at interfaces are fundamental to know the mechanism of photovoltaic processes. The internal potential in solar cell devices depends on the basic processes of photovoltaic effect such as charge carrier generation, separation, transport, recombination, etc. Here we report the direct observation of the surface potential depth profile over the cross-section of the ZnO nanorods/Cu2O based solar cell for two different layer thicknesses at different wavelengths of light using Kelvin probe force microscopy. The topography and phase images across the cross-section of the solar cell are also observed, where the interfaces are well-defined on the nanoscale. The potential profiling results demonstrate that under white light illumination, the photoinduced electrons in Cu2O inject into ZnO due to the interfacial electric field, which results in the large difference in surface potential between two active layers. However, under a single wavelength illumination, the charge carrier generation, separation, and transport processes between two active layers are limited, which affect the surface potential images and corresponding potential depth profile. Because of changes in the active layer thicknesses, small variations have been observed in the charge carrier transport mechanism inside the device. These results provide the clear idea about the charge carrier distribution inside the solar cell in different conditions and show the perfect illumination condition for large carrier transport in a high performance solar cell.
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Affiliation(s)
- Shrabani Panigrahi
- Departamento de Ciência dos Materiais, CENIMAT/i3N, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , 2829-516 Caparica, Portugal
| | - Tomás Calmeiro
- Departamento de Ciência dos Materiais, CENIMAT/i3N, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , 2829-516 Caparica, Portugal
| | - Rodrigo Martins
- Departamento de Ciência dos Materiais, CENIMAT/i3N, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , 2829-516 Caparica, Portugal
| | - Daniela Nunes
- Departamento de Ciência dos Materiais, CENIMAT/i3N, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , 2829-516 Caparica, Portugal
| | - Elvira Fortunato
- Departamento de Ciência dos Materiais, CENIMAT/i3N, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , 2829-516 Caparica, Portugal
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Pimentel A, Ferreira SH, Nunes D, Calmeiro T, Martins R, Fortunato E. Microwave Synthesized ZnO Nanorod Arrays for UV Sensors: A Seed Layer Annealing Temperature Study. Materials (Basel) 2016; 9:ma9040299. [PMID: 28773423 PMCID: PMC5502992 DOI: 10.3390/ma9040299] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [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: 02/27/2016] [Revised: 04/06/2016] [Accepted: 04/15/2016] [Indexed: 11/16/2022]
Abstract
The present work reports the influence of zinc oxide (ZnO) seed layer annealing temperature on structural, optical and electrical properties of ZnO nanorod arrays, synthesized by hydrothermal method assisted by microwave radiation, to be used as UV sensors. The ZnO seed layer was produced using the spin-coating method and several annealing temperatures, ranging from 100 to 500 °C, have been tested. X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and spectrophotometry measurements have been used to investigate the structure, morphology, and optical properties variations of the produced ZnO nanorod arrays regarding the seed layer annealing temperatures employed. After the growth of ZnO nanorod arrays, the whole structure was tested as UV sensors, showing an increase in the sensitivity with the increase of seed layer annealing temperature. The UV sensor response of ZnO nanorod arrays produced with the seed layer annealed temperature of 500 °C was 50 times superior to the ones produced with a seed layer annealed at 100 °C.
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Affiliation(s)
- Ana Pimentel
- i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Sofia Henriques Ferreira
- i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Daniela Nunes
- i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Tomas Calmeiro
- i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Rodrigo Martins
- i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, Caparica 2829-516, Portugal.
| | - Elvira Fortunato
- i3N/CENIMAT, Department of Materials Science, Faculty of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, Caparica 2829-516, Portugal.
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Nunes D, Santos L, Duarte P, Pimentel A, Pinto JV, Barquinha P, Carvalho PA, Fortunato E, Martins R. Room temperature synthesis of Cu₂O nanospheres: optical properties and thermal behavior. Microsc Microanal 2015; 21:108-119. [PMID: 25331195 DOI: 10.1017/s1431927614013348] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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
The present work reports a simple and easy wet chemistry synthesis of cuprous oxide (Cu2O) nanospheres at room temperature without surfactants and using different precursors. Structural characterization was carried out by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy coupled with focused ion beam and energy-dispersive X-ray spectroscopy. The optical band gaps were determined from diffuse reflectance spectroscopy. The photoluminescence behavior of the as-synthesized nanospheres showed significant differences depending on the precursors used. The Cu2O nanospheres were constituted by aggregates of nanocrystals, in which an on/off emission behavior of each individual nanocrystal was identified during transmission electron microscopy observations. The thermal behavior of the Cu2O nanospheres was investigated with in situ X-ray diffraction and differential scanning calorimetry experiments. Remarkable structural differences were observed for the nanospheres annealed in air, which turned into hollow spherical structures surrounded by outsized nanocrystals.
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Affiliation(s)
- Daniela Nunes
- 1Departamento de Ciência dos Materiais,CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT)Universidade Nova de Lisboa and CEMOP-UNINOVA,2829-516 Caparica,Portugal
| | - Lídia Santos
- 1Departamento de Ciência dos Materiais,CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT)Universidade Nova de Lisboa and CEMOP-UNINOVA,2829-516 Caparica,Portugal
| | - Paulo Duarte
- 1Departamento de Ciência dos Materiais,CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT)Universidade Nova de Lisboa and CEMOP-UNINOVA,2829-516 Caparica,Portugal
| | - Ana Pimentel
- 1Departamento de Ciência dos Materiais,CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT)Universidade Nova de Lisboa and CEMOP-UNINOVA,2829-516 Caparica,Portugal
| | - Joana V Pinto
- 1Departamento de Ciência dos Materiais,CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT)Universidade Nova de Lisboa and CEMOP-UNINOVA,2829-516 Caparica,Portugal
| | - Pedro Barquinha
- 1Departamento de Ciência dos Materiais,CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT)Universidade Nova de Lisboa and CEMOP-UNINOVA,2829-516 Caparica,Portugal
| | - Patrícia A Carvalho
- 2ICEMS,Instituto Superior Técnico,Universidade Técnica de Lisboa,Av. Rovisco Pais,1049-001 Lisboa,Portugal
| | - Elvira Fortunato
- 1Departamento de Ciência dos Materiais,CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT)Universidade Nova de Lisboa and CEMOP-UNINOVA,2829-516 Caparica,Portugal
| | - Rodrigo Martins
- 1Departamento de Ciência dos Materiais,CENIMAT/I3N, Faculdade de Ciências e Tecnologia (FCT)Universidade Nova de Lisboa and CEMOP-UNINOVA,2829-516 Caparica,Portugal
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Santos L, Nunes D, Calmeiro T, Branquinho R, Salgueiro D, Barquinha P, Pereira L, Martins R, Fortunato E. Solvothermal synthesis of gallium-indium-zinc-oxide nanoparticles for electrolyte-gated transistors. ACS Appl Mater Interfaces 2015; 7:638-46. [PMID: 25517251 DOI: 10.1021/am506814t] [Citation(s) in RCA: 7] [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] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Solution-processed field-effect transistors are strategic building blocks when considering low-cost sustainable flexible electronics. Nevertheless, some challenges (e.g., processing temperature, reliability, reproducibility in large areas, and cost effectiveness) are requirements that must be surpassed in order to achieve high-performance transistors. The present work reports electrolyte-gated transistors using as channel layer gallium-indium-zinc-oxide nanoparticles produced by solvothermal synthesis combined with a solid-state electrolyte based on aqueous dispersions of vinyl acetate stabilized with cellulose derivatives, acrylic acid ester in styrene and lithium perchlorate. The devices fabricated using this approach display a ION/IOFF up to 1 × 10(6), threshold voltage (VTh) of 0.3-1.9 V, and mobility up to 1 cm(2)/(V s), as a function of gallium-indium-zinc-oxide ink formulation and two different annealing temperatures. These results validates the usage of electrolyte-gated transistors as a viable and promising alternative for nanoparticle based semiconductor devices as the electrolyte improves the interface and promotes a more efficient step coverage of the channel layer, reducing the operating voltage when compared with conventional dielectrics gating. Moreover, it is shown that by controlling the applied gate potential, the operation mechanism of the electrolyte-gated transistors can be modified from electric double layer to electrochemical doping.
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Affiliation(s)
- Lídia Santos
- Departamento de Ciência dos Materiais, CENIMAT/I3N, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa and CEMOP/Uninova , 2829-516 Caparica, Portugal
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Gonçalves V, Rodríguez-Rojo S, Matias A, Nunes A, Nogueira I, Nunes D, Fortunato E, de Matos A, Cocero M, Duarte C. Development of multicore hybrid particles for drug delivery through the precipitation of CO2 saturated emulsions. Int J Pharm 2015; 478:9-18. [DOI: 10.1016/j.ijpharm.2014.11.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 11/02/2014] [Accepted: 11/02/2014] [Indexed: 11/25/2022]
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Araújo A, Caro C, Mendes MJ, Nunes D, Fortunato E, Franco R, Águas H, Martins R. Highly efficient nanoplasmonic SERS on cardboard packaging substrates. Nanotechnology 2014; 25:415202. [PMID: 25257959 DOI: 10.1088/0957-4484/25/41/415202] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This work reports on highly efficient surface enhanced Raman spectroscopy (SERS) constructed on low-cost, fully recyclable and highly reproducible cardboard plates, which are commonly used as disposable packaging material. The active optical component is based on plasmonic silver nanoparticle structures separated from the metal surface of the cardboard by a nanoscale dielectric gap. The SERS response of the silver (Ag) nanoparticles of various shapes and sizes were systematically investigated, and a Raman enhancement factor higher than 106 for rhodamine 6G detection was achieved. The spectral matching of the plasmonic resonance for maximum Raman enhancement with the optimal local electric field enhancement produced by 60 nm-sized Ag NPs predicted by the electromagnetic simulations reinforces the outstanding results achieved. Furthermore, the nanoplasmonic SERS substrate exhibited high reproducibility and stability. The SERS signals showed that the intensity variation was less than 5%, and the SERS performance could be maintained for up to at least 6 months.
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Santos L, Neto JP, Crespo A, Nunes D, Costa N, Fonseca IM, Barquinha P, Pereira L, Silva J, Martins R, Fortunato E. WO3 nanoparticle-based conformable pH sensor. ACS Appl Mater Interfaces 2014; 6:12226-34. [PMID: 25020126 DOI: 10.1021/am501724h] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
pH is a vital physiological parameter that can be used for disease diagnosis and treatment as well as in monitoring other biological processes. Metal/metal oxide based pH sensors have several advantages regarding their reliability, miniaturization, and cost-effectiveness, which are critical characteristics for in vivo applications. In this work, WO3 nanoparticles were electrodeposited on flexible substrates over metal electrodes with a sensing area of 1 mm(2). These sensors show a sensitivity of -56.7 ± 1.3 mV/pH, in a wide pH range of 9 to 5. A proof of concept is also demonstrated using a flexible reference electrode in solid electrolyte with a curved surface. A good balance between the performance parameters (sensitivity), the production costs, and simplicity of the sensors was accomplished, as required for wearable biomedical devices.
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Affiliation(s)
- Lídia Santos
- Departamento de Ciência dos Materiais, CENIMAT/I3N and CEMOP/Uninova, †REQUIMTE, and ‡Departamento de Física, CEFITEC, Faculdade de Ciências e Tecnologia-Universidade Nova de Lisboa , 2829-516 Caparica, Portugal
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Nunes D, Eskinazi B, Camboim Rockett F, Delgado VB, Schweigert Perry ID. Estado nutricional, ingesta alimentaria y riesgo de enfermedad cardiovascular en individuos con esquizofrenia en el sur de Brasil: estudio de casos-controles. Revista de Psiquiatría y Salud Mental 2014; 7:72-9. [DOI: 10.1016/j.rpsm.2013.07.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/15/2013] [Accepted: 07/10/2013] [Indexed: 01/22/2023]
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Nunes D, Gonçalves AP, Carvalho PA. Electron diffraction of ThMn₁₂/Th₂Zn₁₇-type structures in the Nd-Fe-Ti system. Microsc Microanal 2013; 19:1211-1215. [PMID: 23764134 DOI: 10.1017/s1431927613001748] [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: 06/02/2023]
Abstract
Nd:11Fe:Ti alloys prepared by arc melting followed by splat quenching and annealing have been investigated by electron microscopy. The as-cast microstructure evidenced an α-Fe(Ti) --> NdFe₁₁Ti --> Nd₂(Fe,Ti)₁₇ solidification sequence compatible with a cascade of peritectic reactions. The Nd₂(Fe,Ti)₁₇ phase was not detected in the microstructure of the splat-quenched materials, but after annealing the ternary compound grains consisted of a mixture of ThMn₁₂-type and Th₂Zn₁₇-type structures exhibiting a consistent (020)₁:₁₂//(003)₂:₁₇ and [100]₁:₁₂//[110]₂:₁₇, orientation relation, with the invariant plane sitting at (022)₁:₁₂//(333)₂:₁₇. A series of 3D microdiffraction experiments carried out on grains presenting a random distribution of planar defects has been used to map the reciprocal space of the intergrown phases.
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Affiliation(s)
- Daniela Nunes
- ICEMS, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
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Parthiban S, Elangovan E, Nayak PK, Goncalves A, Nunes D, Pereira L, Barquinha P, Busani T, Fortunato E, Martins R. Performances of Microcrystalline Zinc Tin Oxide Thin-Film Transistors Processed by Spray Pyrolysis. ACTA ACUST UNITED AC 2013. [DOI: 10.1109/jdt.2013.2262096] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Nunes D, Correia J, Carvalho P, Shohoji N, Fernandes H, Silva C, Alves L, Hanada K, Ōsawa E. Production of Cu/diamond composites for first-wall heat sinks. Fusion Engineering and Design 2011. [DOI: 10.1016/j.fusengdes.2011.01.085] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mateus R, Carvalho P, Nunes D, Alves L, Franco N, Correia J, Alves E. Microstructural characterization of the ODS Eurofer 97 EU-batch. Fusion Engineering and Design 2011. [DOI: 10.1016/j.fusengdes.2011.01.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Pereira C, Yalçın A, Cretich M, Chiari M, Unlü MS, Nunes D, Bergstein DA. Synergetic chemiluminescence and label-free dual detection for developing a hepatitis protein array. J Immunol Methods 2011; 371:159-64. [PMID: 21718699 DOI: 10.1016/j.jim.2011.06.004] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Revised: 05/27/2011] [Accepted: 06/03/2011] [Indexed: 12/01/2022]
Abstract
A dual detection system for protein arrays is presented that combines label-free detection by optical interference with chemiluminescence. A planar protein array that targets hepatitis B surface antigen is developed. Surface densities for individual antibody spots are quantitated using optical interference prior to use. Target binding (10 ng/ml) is detected label-free. Target binding (1 ng/ml) is detected by both optical interference and chemiluminescence with the inclusion of secondary antibodies. Binding results using both methods are found to be directly proportion to the capture probe density measured initially. The dual detection system provides the analytical utility of optical interference detection with the established clinical utility of chemiluminescence detection.
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Affiliation(s)
- C Pereira
- Zoiray Technologies Inc., Boston, MA, USA
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van Leth F, Conway B, Laplumé H, Martin D, Fisher M, Jelaska A, Wit FW, Lange JMA, Laplumé H, Lasala MB, Losso MH, Bogdanowicz E, Lattes R, Krolewiecki A, Zala C, Orcese C, Terlizzi S, Duran A, Ebensrteijn J, Bloch M, Russell O, Russell DB, Roth NR, Eu B, Austin D, Gowers A, Quan D, Demonty J, Peleman R, Vandercam B, Vogelaers D, van der Gucht B, van Wanzeele F, Moutschen MM, Badaro R, Grinsztejn B, Schechter M, Uip D, Netto EN, Coelho SS, Badaró F, Pilotto JH, Schubach A, Barros ML, Leite OHM, Kiffer CRV, Wunsch CT, Nunes D, Catalani A, de Cassia Alves LR, Dossin TJ, D'Alló de Oliveira MT, Martini S, Conway B, de Wet JJ, Montaner JSG, Murphy C, Woodfall B, Sestak P, Phillips P, Montessori V, Harris M, Tesiorowski A, Willoughby B, Voigt R, Farley J, Reynolds R, Devlaming S, Livrozet JM, Rozenbaum W, Sereni D, Valantin MA, Lascoux C, Milpied B, Brunet C, Billaud E, Huart A, Reliquet V, Charonnat MF, Sicot M, Esnault JL, Slama L, Staszewski S, Bickel M, Lazanas MK, Stavrianeas N, Mangafas N, Zagoreos I, Kourkounti S, Paparizos V, Botsi C, Clarke S, Brannigan E, Boyle N, Chiriani A, Leoncini F, Montella F, Francesco L, Ambu S, Farese A, Gargiulo M, Di Sora F, Lavria F, Folgori F, Beniowski M, Boron Kaczmarska A, Halota W, Prokopowicz D, Bander DB, Leszuzyszyn-Pynka MLP, Wnuk AW, Bakowska E, Pulik P, Flisiak R, Wiercinska-Drapalo A, Mularska E, Witor A, Antunes F, Sarmento RSE, Doroana M, Horta AA, Vasconcelos O, Andrews SM, Huisamen CB, Johnson D, Martin O, Bekker LG, Maartens G, Wilson D, Visagie CJ, David NJ, Rattley M, Nettleship E, Martin DJ, Keyser V, Moraites TM, Moorhouse MA, Pitt JA, Orrell CJ, Bester C, Parboosing R, Moodley P, Gathiram V, Woolf D, Bernasconi E, Magenta L, Cardiello P, Kroon E, Ungsedhapand C, Fisher M, Wilkins EGL, Stockwell E, Day J, Daintith RS, Perry N, Timaeus C, Intosh-Roffet JM, Powell A, Youle M, Tyrer M, Madge S, Drinkwater A, Cuthbertson Z, Carroll A, Becker S, Katner H, Rimland D, Saag MS, Thompson M, Witt M, Aguilar MM, LaVoy A, Illeman M, Guerrero M, Gatell J, Belsey E, Hirschel B, Potarca A, Cronenberg M, Kreekel L, Meester R, Khodabaks J, Botma HJ, Esrhir N, Farida I, Feenstra M, Jansen K, Klotz A, Mulder M, Ruiter G, Bass CB, Pluymers E, de Vlegelaer E, Leeneman (VCL) R, Carlier H, van Steenberge E, Hall D. Quality of Life in Patients Treated with First-Line Antiretroviral Therapy Containing Nevirapine And/Or Efavirenz. Antivir Ther 2004. [DOI: 10.1177/135965350400900512] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Objective To assess whether differences in safety profiles between nevirapine (NVP) and efavirenz (EFV), as observed in the 2NN study, translated into differences in ‘health related quality of life’ (HRQoL). Design A sub-study of the 2NN study, with antiretro-viral-naive patients randomly allocated to NVP (once or twice daily), EFV or NVP+EFV, in addition to stavudine and lamivudine. Methods Comparing differences in changes of HRQoL over 48 weeks as measured with the Medical Outcomes Study HIV Health Survey (MOS-HIV) questionnaire, using analysis of variance. Results The 2NN study enrolled 1216 patients. No validated questionnaires were available for 244 patients, and 55 patients had no HRQoL data at all, leaving 917 patients eligible for this sub-study. A total of 471 (51%) had HRQoL measurements both at baseline and week 48. The majority (69%) of patients without HRQoL measurements did, however, complete the study. The change in the physical health score (PHS) was 3.9 for NVP, 3.4 for EFV and 2.4 for NVP+EFV ( P=0.712). For the mental health score (MHS) these values were 6.1, 7.0 and 3.9, respectively ( P=0.098). A baseline plasma HIV-1 RNA concentration (pVL) ≥100 000 copies/ml and a decline in pVL (per log10) were independently associated with an increase of PHS. An increase of MHS was only associated with pVL decline. Patients experiencing an adverse event during follow-up had a comparable change in PHS but a significantly smaller change in MHS, compared with those without an adverse event. Conclusions First-line ART containing NVP and/or EFV leads to an improvement in HRQoL. The gain in HRQoL was similar for NVP and EFV, but slightly lower for the combination of these drugs.
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Affiliation(s)
| | - Frank van Leth
- International Antiviral Therapy Evaluation Center (IATEC); Department of Internal Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Brian Conway
- University of British Columbia, Vancouver, BC, Canada
| | - Hector Laplumé
- Hospital Profesor Alejandro Posadas, Buenos Aires, Argentina
| | - Des Martin
- Toga Laboratories, Edenvale, South Africa
| | - Martin Fisher
- Brighton and Sussex University Hospitals, Brighton, UK
| | - Ante Jelaska
- Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, Conn., USA
| | - Ferdinand W Wit
- International Antiviral Therapy Evaluation Center (IATEC); Department of Internal Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Joep MA Lange
- International Antiviral Therapy Evaluation Center (IATEC); Department of Internal Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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Nunes D, Piliero PJ. Antiretroviral rounds. A co-infection treatment dilemma. AIDS Clin Care 2000; 12:58-9. [PMID: 12170957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
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Affiliation(s)
- V Raj
- Boston Medical Center, Boston, Massachusetts, USA
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Queiroz C, Levi T, Serra I, Cascais F, Mourâo J, Matos A, Nunes D. The awareness of Science. Glob Bioeth 1994. [DOI: 10.1080/11287462.1994.10800890] [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: 10/28/2022] Open
Affiliation(s)
- C. Queiroz
- Universidade de Lisboa Faculdade de Ciêncíos Campo Grande 1700 Lisboa Portugal
| | - T. Levi
- Universidade de Lisboa Faculdade de Ciêncíos Campo Grande 1700 Lisboa Portugal
| | - I. Serra
- Universidade de Lisboa Faculdade de Ciêncíos Campo Grande 1700 Lisboa Portugal
| | | | | | - A.C. Matos
- Instituto Nacional de Engenharia e Tecnologia Industrial (INETI)
| | - D. Nunes
- Escola Secundaria de Paço d'Arcos
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O’Mahony D, Rowan M, Feely J, Walsh JB, Coakley D, Nicklason F, Mulkerrin E, Sykes D, Dewar R, Finucane P, Beringer TRO, O’Mahony P, Matheson R, Webster M, MacMahon M, Lynch M, Nunes D, Weir DG, O’Moore RR, Keane CT, O’Reilly S, Asian S, Duncan D, Dwear R, Nicklasan F, Thomas D, Seymour R, Duggan J, Kilfeather S, O’Malley K, McCormack PME, Lawlor R, Donegal C, O’Neill D, Rice I, Blake P, Donegan CF, Farrell A, Cunnane G, McCarthy N, Watters L. Irish gerontological society. Ir J Med Sci 1992. [DOI: 10.1007/bf02984673] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
Dyspepsia associated with arthritis and non-steroidal anti-inflammatory drugs (NSAIDs) is a common clinical problem. Up to 80% of deaths attributable to peptic ulceration may be associated with NSAID usage. The problem is foremost in the elderly population, in which there has been an increase both in the incidence of peptic ulcers and in the use of NSAIDs. Although the development of duodenal ulceration is not clearly associated with NSAIDs, it is accepted that these drugs increase the risk of gastric ulceration and the occurrence of peptic ulcer complications. Asymptomatic peptic ulceration is common, and patients taking NSAIDs are often asymptomatic prior to presentation with life-threatening complications. The key principle in management of this problem is prevention through careful selection of patients for NSAID use, adequate treatment of peptic ulceration and maintenance of remission. A variety of effective drugs are available for the treatment of peptic ulcers, including H2-receptor antagonists, pirenzepine, sucralfate and colloidal bismuth subcitrate. However, it is recognised that peptic ulceration is a chronic disease with a relapsing-remitting course, often with asymptomatic ulcer episodes. The knowledge that current ulcer-healing strategies do not significantly alter this natural history has lead to increasing efforts to prevent relapse with effective 'maintenance' therapy.
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Affiliation(s)
- D Nunes
- Department of Clinical Medicine, Trinity College, Dublin, Ireland
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Bourke S, Nunes D, Stafford F, Hurley G, Graham I. Percussion of the chest re-visited: a comparison of the diagnostic value of ausculatory and conventional chest percussion. Ir J Med Sci 1989; 158:82-4. [PMID: 2753659 DOI: 10.1007/bf02942111] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Percussion of the chest is thought to be insensitive in detecting small or deeply situated chest lesions. A newer technique, ausculatory percussion, has been reported as having a far higher sensitivity. In a controlled blind study the diagnostic value of conventional chest percussion compared with ausculatory percussion was defined using the chest x-ray as a gold standard. The prevalence of disease in 100 lung fields was 26%. The majority of lesions were not detected by either technique resulting in very low sensitivities of 15.4% for conventional percussion and 19.2% for ausculatory percussion. A positive result with ausculatory percussion was twice as likely to be false as true (positive predictive value 31.2%). The technique did not add to the diagnostic value of conventional percussion. Both techniques have major limitations. Patients with suspected lung disease still require chest x-ray examination if percussion is normal.
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Murphy R, Doughty N, Nunes D. Multielement designs: an alternative to reversal and multiple baseline evaluation strategies. Ment Retard 1979; 17:23-7. [PMID: 481208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Ong J, Nunes D. Effect on food intake by rats of day-night cycle control and increment in deprivation. Psychol Rep 1969; 25:535-8. [PMID: 5367138 DOI: 10.2466/pr0.1969.25.2.535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Additional data on the relation between food intake and deprivation were provided by incorporating Siegel's day-night cycle control and extending the small increments in deprivation. Ten male hooded rats were housed in individual translucen cages and exposed to a constant illumination from a 25-w light. on the last day of a 10-day base period 10 Ss were assigned to 10 deprivation levels: 0, 8, 16, 24, 36, 48, 60, 72, 84, and 96 hr., but each S began a sequence at each of the 10 levels and then began another at the next level so that each level preceded and followed each other level an equal number of times. Before each deprivation Ss were weighed, deprived, and then given a 3-hr. food-intake period. At the end of this period remaining food pellets were removed and weighed. Ss were maintained on a continuous food schedule for at least twice as long as the last deprivation in order to regain lost weight. Food intake increased steadily and reached constant maximum after 16 hr., not the usual 24 hr.
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