41 results on '"MARTINES, MARCO ANTONIO UTRERA"'
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2. Cytotoxicity, anti-inflammatory effect, and acute oral toxicity of a novel Attalea phalerata kernel oil-loaded nanocapsules
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Acácio, Bianca Rodrigues, Prada, Ariadna Lafourcade, Neto, Serafim Florentino, Gomes, Giovana Bicudo, Perdomo, Renata Trentin, Nazario, Carlos Eduardo Domingues, Neto, Eduardo Sobieski, Martines, Marco António Utrera, de Almeida, Danielle Ayr Tavares, Gasparotto Junior, Arquimedes, and Amado, Jesus Rafael Rodriguez
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- 2024
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3. Development of a TiO2 nanotube photoanode decorated with MIL-53(Fe) for the photoelectrochemical degradation of 2,4-dimethylaniline
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da Silva, Thalita Ferreira, Cavalheri, Priscila Sabioni, Cardoso, Juliano Carvalho, Nazario, Carlos Eduardo Domingues, Jorge, Juliana, Martines, Marco Antonio Utrera, Ravaglia, Luciana Marçal, Alcantara, Glaucia Braz, Casagrande, Gleison Antônio, Caires, Anderson Rodrigues Lima, Cavalcante, Rodrigo Pereira, de Oliveira, Silvio César, Gozzi, Fabio, Sirés, Ignasi, and Junior, Amilcar Machulek
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- 2024
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4. Cetyltrimethylammonium bromide in the synthesis of mesoporous silica nanoparticles: General aspects and in vitro toxicity
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Carvalho, Gabriela Corrêa, Marena, Gabriel Davi, Karnopp, Juliana Camila Fischer, Jorge, Juliana, Sábio, Rafael Miguel, Martines, Marco Antonio Utrera, Bauab, Taís Maria, and Chorilli, Marlus
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- 2022
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5. Molecular docking and dynamic simulations of Cefixime, Etoposide and Nebrodenside A against the pathogenic proteins of SARS-CoV-2
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Rashid, Haroon ur, Ahmad, Nasir, Abdalla, Mohnad, Khan, Khalid, Martines, Marco Antonio Utrera, and Shabana, Samah
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- 2022
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6. Synthesis and Characterization of Novel Silylated Sm3+ and Eu3+ Complexes Incorporated into Mesoporous and Dense Silica Nanoparticles
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Jorge, Juliana, primary, Silva, Jaqueline Rodrigues da, additional, Boldo, Diego, additional, Santos, Kristiane Fanti Del Pino, additional, Duarte, Adriana Pereira, additional, Castro, Gustavo Rocha de, additional, Azevedo, Ricardo Bentes de, additional, Prada, Ariadna Lafourcade, additional, Amado, Jesús Rafael Rodríguez, additional, Verelst, Marc, additional, and Martines, Marco Antonio Utrera, additional
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- 2024
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7. Potential Drug Candidates in Clinical Trials for the Treatment of Covid-19: An Updated Overview
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Caceres, Osmar Ignacio Ayala, Timoteo, Fernanda, Santos, Kristiane Fanti Del Pino, Vasconcelos, Rafael Rodrigo Piva, Martines, Marco Antonio Utrera, Jorge, Juliana, and Rashid, Haroon ur
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- 2021
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8. Tailoring pore structures and morphologies of highly ordered cubic mesoporous silica prepared in mild conditions: the effects of reaction parameters
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Silveira, Roberto Medeiros, de Almeida, Everton Rodrigues, Ospina, Carlos Alberto, de Castro, Gustavo Rocha, Verelst, Marc, and Martines, Marco Antonio Utrera
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- 2021
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9. Biodegradation of eugenol-loaded polyhydroxybutyrate films in different soil types
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Rech, Chaiane Regina, da Silva Brabes, Kelly Cristina, Bagnara e Silva, Bárbara Ellen, Bittencourt, Paulo Rodrigo Stival, Koschevic, Marivane Turim, da Silveira, Tayla Fernanda Serantoni, Martines, Marco Antonio Utrera, Caon, Thiago, and Martelli, Silvia Maria
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- 2020
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10. Anti-cancer potential of sophoridine and its derivatives: Recent progress and future perspectives
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ur Rashid, Haroon, Rasool, Shagufta, Ali, Yousaf, Khan, Kamin, and Martines, Marco Antonio Utrera
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- 2020
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11. New complexes of usnate with lanthanides ions: La(III), Nd(III), Tb(III), Gd(III), synthesis, characterization, and investigation of cytotoxic properties in MCF-7 cells
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Nunes, Daniel Mendes, Pessatto, Lucas Roberto, Mungo, Daniel, Oliveira, Rodrigo Juliano, Pinto, Leandro Moreira de Campos, da Costa Iemma, Monica Rosas, Altei, Wanessa Fernanda, Martines, Marco Antonio Utrera, and Pereira Duarte, Adriana
- Published
- 2020
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12. Development of a TiO2 nanotube photoanode decorated with MIL-53(Fe) for the electrochemical degradation of 2,4-dimethylaniline
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da Silva, Thalita Ferreira, primary, Cavalheri, Priscila Sabioni, additional, Cardoso, Juliano Carvalho, additional, Nazario, Carlos Eduardo Domingues, additional, Jorge, Juliana, additional, Martines, Marco Antonio Utrera, additional, Ravaglia, Luciana Marçal, additional, Alcantara, Glaucia Braz, additional, Casagrande, Gleison Antônio, additional, Caires, Anderson Rodrigues Lima, additional, Cavalcante, Rodrigo Pereira, additional, de Oliveira, Silvio César, additional, Gozzi, Fabio, additional, Sirés, Ignasi, additional, and Junior, Amilcar Machulek, additional
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- 2024
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13. Synthesis, Characterization, and Cytotoxicity Evaluation of Chlorambucil-Functionalized Mesoporous Silica Nanoparticles.
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Karnopp, Juliana Camila Fischer, Jorge, Juliana, da Silva, Jaqueline Rodrigues, Boldo, Diego, Del Pino Santos, Kristiane Fanti, Duarte, Adriana Pereira, de Castro, Gustavo Rocha, de Azevedo, Ricardo Bentes, Prada, Ariadna Lafourcade, Amado, Jesús Rafael Rodríguez, and Martines, Marco Antonio Utrera
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SILICA nanoparticles ,FOURIER transform infrared spectroscopy ,MESOPOROUS silica ,CYTOTOXINS ,DRUG delivery systems - Abstract
This study describes the synthesis and characterization of chlorambucil (CLB)-functionalized mesoporous silica nanoparticles (MSNs) for potential application in cancer therapy. The nanoparticles were designed with a diameter between 20 and 50 nm to optimize cellular uptake and avoid rapid clearance from the bloodstream. The synthesis method involved modifying a previously reported technique to reduce particle size. Successful functionalization with CLB was confirmed through various techniques, including Fourier transform infrared spectroscopy (FTIR) and elemental analysis. The cytotoxicity of the CLB-functionalized nanoparticles (MSN@NH
2 -CLB) was evaluated against human lung adenocarcinoma cells (A549) and colon carcinoma cells (CT26WT). The results suggest significantly higher cytotoxicity of MSN@NH2 -CLB compared to unbound CLB, with improved selectivity towards cancer cells over normal cells. This suggests that MSN@NH2 -CLB holds promise as a drug delivery system for targeted cancer therapy. [ABSTRACT FROM AUTHOR]- Published
- 2024
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14. NO-cGMP-K + Channels Pathways Participate in the Antihypertensive Effects of Attalea phalerata Martius ex Spreng Oil-Loaded Nanocapsules.
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de Azevedo, Maria Medina, Lívero, Francislaine Aparecida dos Reis, Tinelli, Sílvia Beatriz Bürger, da Silva, Jacenir Vieira, de Almeida, Danielle Ayr Tavares, Martines, Marco Antonio Utrera, Prada, Ariadna Lafourcade, Rodríguez Amado, Jesús Rafael, and Gasparotto Junior, Arquimedes
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CYCLIC adenylic acid ,CYCLIC guanylic acid ,NITRIC-oxide synthases ,GUANYLATE cyclase ,DRUG carriers ,POTASSIUM channels - Abstract
Attalea phalerata Martius ex Spreng is a palm tree that is widely distributed in the Central-West region of Brazil. In this study, we investigated whether the oil-loaded nanocapsules of A. phalerata (APON) have acute and long-lasting antihypertensive effects in male spontaneously hypertensive rats (SHR), as well as explored the underlying molecular mechanisms. APON was prepared using the interfacial polymer deposition method. The particle size, polydispersity index, and zeta potential were investigated using dynamic and electrophoretic light scattering. The antihypertensive effects of APON (administered at doses of 1, 3, and 10 mg/kg) were evaluated after acute intraduodenal administration and after 7 days of oral treatment. To investigate the molecular pathways involved, we used pharmacological antagonists and inhibitors that target prostaglandin/cyclic adenosine monophosphate, nitric oxide/cyclic guanosine monophosphate, and potassium channels. Both acute and prolonged administration of APON (at doses of 3 and 10 mg/kg) resulted in a significant reduction in systolic, diastolic, and mean arterial pressure. Prior treatment with a non-selective nitric oxide synthase inhibitor (Nω-nitro-L-arginine methyl ester), guanylyl cyclase inhibitor (methylene blue), or non-selective calcium-sensitive K
+ channel blocker (tetraethylammonium) abolished the antihypertensive effects of APON. Our study showed that A. phalerata oil-loaded nanocapsules have a significant antihypertensive effect in SHR after both short-term and long-term (7-day) use. This effect seems to rely on the vascular endothelium function and involves the NO-cGMP-K+ channel pathway. This research suggests a new direction for future studies to definitively prove the therapeutic benefits of APON in treating cardiovascular disease. [ABSTRACT FROM AUTHOR]- Published
- 2024
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15. Antileishmanial Activity, Toxicity and Mechanism of Action of Complexes of Sodium Usnate with Lanthanide Ions: Eu(III), Sm(III), Gd(III), Nd(III), La(III) and Tb(III)
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da Silva, Fernanda, primary, Rizk, Yasmin Silva, additional, das Neves, Amarith Rodrigues, additional, Lourenço, Estela Mariana Guimarães, additional, Ferreira, Alda Maria Teixeira, additional, Monteiro, Melquisedeque Mateus, additional, de Lima, Dênis Pires, additional, Perdomo, Renata Trentin, additional, Bonfá, Iluska Senna, additional, Toffoli-Kadri, Mônica Cristina, additional, Duarte, Adriana Pereira, additional, Nunes, Daniel Mendes, additional, Martines, Marco Antonio Utrera, additional, Piranda, Eliane Mattos, additional, and de Arruda, Carla Cardozo Pinto, additional
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- 2023
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16. Resorcinolic lipid 3-heptyl-3,4,6-trimethoxy-3H-isobenzofuran-1-one is a strategy for melanoma treatment
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Navarro, Stephanie Dynczuki, Pessatto, Lucas Roberto, Meza, Alisson, de Oliveira, Edwin José Torres, Auharek, Sarah Alves, Vilela, Lizia Colares, de Lima, Dênis Pires, de Azevedo, Ricardo Bentes, Kassuya, Candida Aparecida Leite, Cáceres, Osmar Ignacio Ayala, da Silva Gomes, Roberto, Beatriz, Adilson, Oliveira, Rodrigo Juliano, and Martines, Marco Antonio Utrera
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- 2018
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17. Cyclen-based Gd3+ complexes as MRI contrast agents: Relaxivity enhancement and ligand design
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Rashid, Haroon Ur, Martines, Marco Antonio Utrera, Jorge, Juliana, de Moraes, Paula Martin, Umar, Muhammad Naveed, Khan, Kamin, and Rehman, Hanif Ur
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- 2016
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18. Antileishmanial Activity, Toxicity and Mechanism of Action of Complexes of Sodium Usnate with Lanthanide Ions: Eu(III), Sm(III), Gd(III), Nd(III), La(III) and Tb(III).
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da Silva, Fernanda, Rizk, Yasmin Silva, das Neves, Amarith Rodrigues, Lourenço, Estela Mariana Guimarães, Ferreira, Alda Maria Teixeira, Monteiro, Melquisedeque Mateus, de Lima, Dênis Pires, Perdomo, Renata Trentin, Bonfá, Iluska Senna, Toffoli-Kadri, Mônica Cristina, Duarte, Adriana Pereira, Nunes, Daniel Mendes, Martines, Marco Antonio Utrera, Piranda, Eliane Mattos, and de Arruda, Carla Cardozo Pinto
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RARE earth metals ,TERBIUM ,CUTANEOUS leishmaniasis ,LEISHMANIASIS ,IONS ,SODIUM ,CYTOTOXINS - Abstract
Leishmaniases are neglected diseases with limited therapeutic options. Diffuse cutaneous leishmaniasis can occur in Brazil due to Leishmania amazonensis. This study details the antileishmanial activity and cytotoxicity of complexes of sodium usnate (SAU) with lanthanide ions ([LnL
3 (H2 O)x ] (Ln = La(III), Nd(III), Gd(III), Tb(III), Eu(III) and Sm(III); L = SAU). All lanthanide complexes were highly active and more potent than SAU against L. amazonensis promastigotes and intracellular amastigotes (Pro: IC50 < 1.50 μM; Ama: IC50 < 7.52 μM). EuL3 ·3H2 O and NdL3 ·3H2 O were the most selective and effective on intracellular amastigotes, with a selectivity index of approximately 7.0. In silico predictions showed no evidence of mutagenicity, tumorigenicity or irritation for all complexes. Treatment with EuL3 ·3H2 O triggered NO release even at the lowest concentration, indicating NO production as a mechanism of action against the parasite. Incubating promastigotes with the lanthanide complexes, particularly with SmL3 ·4H2 O and GdL3 ·3H2 O, led to a change in the mitochondrial membrane potential, indicating the ability of these complexes to target this essential organelle. The same complexes caused cell death through cell membrane disruption, but their relationship with early or late apoptotic processes remains unclear. Thus, the inclusion of lanthanide ions in SAU improves selectivity with a promising mechanism of action targeting the mitochondria. [ABSTRACT FROM AUTHOR]- Published
- 2024
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19. STRATEGIC PROPOSALS FOR RISK MANAGEMENT FOR NANOTECHNOLOGY/ PROPOSTAS ESTRATEGICAS DE GESTAO DE RISCOS PARA A NANOTECNOLOGIA
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Martines, Marco Antonio Utrera, dos Santos, Nivaldo, and Nolasco, Loreci Gottschalk
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- 2016
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20. Electrochemical study of o-toluidine blue impregnated in mesoporous silica channels
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Martines, Marco Antonio Utrera, do Carmo, Devaney Ribeiro, de Castro, Gustavo Rocha, and Caetano, Laércio
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- 2011
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21. Adsorption and electropolymerization of toluidine blue on the nanostructured octakis(hydridodimethylsiloxy)octasilsesquioxane surface
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do Carmo, Devaney Ribeiro, de Castro, Gustavo Rocha, Martines, Marco Antonio Utrera, Filho, Newton Luiz Dias, and Stradiotto, Nelson Ramos
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- 2008
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22. Effect of fat chain length of sorbitan surfactant on the porosity of mesoporous silica
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Martines, Marco Antonio Utrera, Menues, Larissa Souza, Jorge, Juliana, de Castro, Gustavo Rocha, Pastura, Nidia Maria Ribeiro, Scofield, Cinthia Fraga, and Gonzalez, Wilma de Araujo
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- 2009
23. Research developments in the syntheses, anti-inflammatory activities and structure–activity relationships of pyrimidines
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Rashid, Haroon ur, primary, Martines, Marco Antonio Utrera, additional, Duarte, Adriana Pereira, additional, Jorge, Juliana, additional, Rasool, Shagufta, additional, Muhammad, Riaz, additional, Ahmad, Nasir, additional, and Umar, Muhammad Naveed, additional
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- 2021
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24. Preparation of the Rutin-SBA-16 Drug Delivery System
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Karnopp, Juliana Camila Fischer, primary, Cardoso, Teófilo Fernando Mazon, additional, Gonçalves, Daniel Araujo, additional, Carollo, Aline Regina Hellman, additional, Castro, Gustavo Rocha de, additional, Duarte, Adriana Pereira, additional, and Martines, Marco Antonio Utrera, additional
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- 2020
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25. Evaluation of the Structural, Photonic and Morphologic Effects Caused by Zinc Doping in the Titanium Dioxide Powder Samples Obtained by Sol-Gel Method
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de Queiroz, Joice Ferreira, primary, dos Santos, Silvanice Aparecida Lopes, additional, Herrero, Aline Souza, additional, Martines, Marco Antonio Utrera, additional, Cavalheiro, Alberto Adriano, additional, and de Oliveira, Lincoln Carlos Silva, additional
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- 2018
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26. Cassava Root Husks as a Sorbent Material for the Uptake and Pre-concentration of Cadmium(II) from Aqueous Media
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Jorgetto, Alexandre de Oliveira [UNESP], Silva, Adrielli Cristina Peres da [UNESP], Cavecci, Bruna [UNESP], Barbosa, Rodrigo Correa [UNESP], Martines, Marco Antonio Utrera, Castro, Gustavo Rocha de [UNESP], Universidade Estadual Paulista (Unesp), and Universidade Federal de Mato Grosso do Sul (UGMS)
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Cassava ,Solid-phase extraction ,cadmium ,Science ,cassava ,Chemistry ,pre-concentration ,Pre-concentration ,adsorption ,solid-phase extraction ,Adsorption ,QD1-999 ,Cadmium - Abstract
Made available in DSpace on 2016-03-02T12:59:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2013. Added 1 bitstream(s) on 2016-03-02T13:13:06Z : No. of bitstreams: 1 ISSN1984-6428-2013-05-03-206-212.pdf: 231613 bytes, checksum: 9b3b1efb22c23c875ca9f7bfaa03d48a (MD5) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Cassava husks were undergone to simple processes to obtain a fine powder whose particle diameter varied from 63 μm to 75 μm. The characterization of the material indicated the presence of the groups alcohol, amine and thiocarbonyl. The material was tested through batch experiments and the effect of the contact time and pH over the adsorption of Cd(II) ions were evaluated. The material presented a rapid kinetic equilibrium, which was reached in less than 1 min, and the highest Cd(II) uptake occurred at pH 5. The optimum conditions obtained were applied to determine the material’s maximum adsorption capacity with the aid of the linearized Langmuir equation (0.109 mmol g-1). A pre-concentration experiment was also carried out, and provided a pre-concentration factor of 43-fold. Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Instituto de Biociências de Botucatu (IBB), Departamento de Química e Bioquímica, Botucatu, SP, Brasil Universidade Federal de Mato Grosso do Sul (UFMS), Instituto de Química, Campo Grande, MS, Brasil Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Instituto de Biociências de Botucatu (IBB), Departamento de Química e Bioquímica, Botucatu, SP, Brasil FAPESP: 2011/14944-5 CNPq: 302284/2012-5
- Published
- 2013
27. Comparison among Different pH Values of Rhodamine B Solution Impregnated into Mesoporous Silica
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Jorge, Juliana, Castro, Gustavo Rocha de [UNESP], Martines, Marco Antonio Utrera, Universidade Federal de Mato Grosso do Sul (UFMS), and Universidade Estadual Paulista (Unesp)
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Chemistry ,Biological markers ,xanthenes dye ,Xanthenes dye ,Science ,pH effect ,photoluminescence ,ph effect ,Photoluminescence ,QD1-999 ,biological markers - Abstract
Made available in DSpace on 2016-03-02T12:59:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2013. Added 1 bitstream(s) on 2016-03-02T13:13:09Z : No. of bitstreams: 1 ISSN1984-6428-2013-05-01-23-29.pdf: 242746 bytes, checksum: c698a4d2767e04b6b78d52ed721714cd (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado de Mato Grosso do Sul (FUNDECT-MS) We studied the behavior of different pH values of Rhodamine B solution impregnated into pores of mesoporous silica, through structural characterization techniques, such as scanning electron microscopy and porosity measurements, and spectroscopic characterization techniques, such as infrared and luminescence spectroscopy; in order to applications in luminescence. Because, Rhodamine B is an interesting xanthene dye whose optical properties depend of many factors, dye concentration and pH values. MSU-4 type mesoporous silica has been synthesized with Tween 60 surfactant as directing-structure agent and tetraethyl orthosilicate (Si(OEt)4, TEOS) as silica source. The mesoporous structures doped with dyes are promissory materials for several applications, for example, optical sensors and biomarkers. Universidade Federal de Mato Grosso do Sul (UFMS), Instituto de Química, Campo Grande, MS, Brasil Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Instituto de Biociências de Botucatu (IBB), Departamento de Química e Bioquímica, Botucatu, SP, Brasil Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Instituto de Biociências de Botucatu (IBB), Departamento de Química e Bioquímica, Botucatu, SP, Brasil
- Published
- 2013
28. SYNTHESIS AND CHARACTERIZATION OF GADOLINIUM-BASED NANOCRYSTALS FOR THEIR POTENTIAL APPLICATION AS TRIMODAL IMAGING CONTRAST AGENTS.
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UR RASHID, HAROON, YASEEN, MUHAMMAD, RIAZ, ALI, KHAN, KAMIN, UR RAHMAN, HANIF, KHAN, KHALID, AHMAD, NASIR, and MARTINES, MARCO ANTONIO UTRERA
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GADOLINIUM ,NANOCRYSTALS ,CONTRAST media ,NANOSTRUCTURED materials ,PHOTOLUMINESCENCE ,MAGNETIC resonance imaging - Abstract
Lanthanide-doped gadolinium nanomaterials have attracted considerable attention due to their promising applications in biological imaging. Sodium gadolinium fluoride (β-NaGdF
4 ) nanomaterials act as perfect host for doping of luminescent lanthanide ions. Due to heavy nature of gadolinium, it can strongly absorb X-ray radiations. Therefore, Gd-based nanomaterials are applied as contrast agents for X-ray tomography (CT). Presence of seven unpaired electrons in Gd+3 ion, its large magnetic moment and long electronic relaxation time makes it an ideal candidate to enhance water proton relaxation rates. These characteristics make Gd-based nanomaterial useful for their potential application as MRI contrast agents. In this work, sodium gadolinium fluoride is doped with ytterbium and erbium to produce β-NaGdF4 :Yb/Er as core nanocrystals. They are subsequently coated with sodium gadolinium fluoride doped with neodymium (β-NaGdF4 :Nd) to produce β-NaGdF4 :Yb/Er@β-NaGdF4 :Nd core-shell nanocrystals. Powder X-ray diffraction (XRD) results indicated that β-NaGdF4 (host), β-NaGdF4 :Yb/Er (core) and β-NaGdF4 :Yb/Er@β-NaGdF4 :Nd (core-shell) nanocrystals all exist in hexagonal crystalline phase. While Dynamic Light Scattering (DLS) results indicated that the particle size of the synthesized nanocrystals was in range of 12 to 27 nm. FTIR results confirmed that the synthesized nanocrystals were stabilized by oleic acid. Nanocrystals reported in this work are expected to be useful trimodal contrast agents for photoluminescence, X-ray tomography and Magnetic Resonance Imaging (MRI). [ABSTRACT FROM AUTHOR]- Published
- 2020
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29. PROPOSTAS ESTRATÉGICAS DE GESTÃO DE RISCOS PARA A NANOTECNOLOGIA
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NOLASCO, LORECI GOTTSCHALK, primary, SANTOS, NIVALDO DOS, additional, and MARTINES, MARCO ANTONIO UTRERA, additional
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- 2016
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30. Propriedades espectroscópicas de sílica contendo crômio
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Martines, Marco Antonio Utrera [UNESP], Universidade Estadual Paulista (Unesp), Davolos, Marian Rosaly [UNESP], and Jafelicci Júnior, Miguel [UNESP]
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Chromium ,Crômio ,Chemistry inorganic ,Silica gel ,Análise espectral ,Química inorgânica - Abstract
Made available in DSpace on 2014-06-11T19:35:08Z (GMT). No. of bitstreams: 0 Previous issue date: 1997Bitstream added on 2014-06-13T20:45:54Z : No. of bitstreams: 1 martines_mau_dr_araiq.pdf: 2947884 bytes, checksum: 72629200eaa3a20a5b20f28125019cc8 (MD5) Sílica contendo crômio faz parte de uma classe importante de materiais devido às aplicações como catalisador de polimerização e de oxidação, fibras ópticas, laseres e preparação de pigmentos. Este trabalho está dividido em duas partes. A primeira refere-se ao gel úmido e seco de sílica contendo crômio. Os géis foram preparados fazendo-se a mistura das soluções de silicato de sódio solúvel (vidrolíquido) e de soluções aquosas de nitrato de crômio em pH 4 ou 9 previamente ajustado, ou em 4 após a mistura das soluções. O gel foi caracterizado por espectroscopia eletrônica de absorção no ultravioleta -visível e por microscopia eletrônica de transmissão. A morfologia dos géis de sílica e de sílica contendo crômio é dependente do valor de pH e da ordem de mistura dos reagentes. Este efeito é atribuído às espécies poliméricas do crômio diferenciadas presentes na solução que controlam a forma da partícula. Partículas esféricas podem ser obtidas pelo colapso de microgel com alto grau de ligação cruzada. A outra parte do trabalho consiste na preparação de sílica contendo crômio por dois métodos: aquecimento convencional e banho de ultra-som nas temperaturas de 50 e 80oC. O gel obtido foi tratado por extrações com soluções ácidas, extrações com água e diálise, e seco em forno de microondas. As amostras de sílica/crômio em pó foram submetidas ao tratamento térmico em temperaturas de 200 a 1400oC, com intervalos de 200oC, sob atmosfera... Chromium-containing silica belongs to an important class of materials having technological applications such as polymerization and oxidation catalyses, lasers, pigments and optical fibers. The chromium-containing silica and pure silica gels were obtained by mixing solutions of soluble sodium silicate (water glass) and chromium nitrate with adjusted pH 4 or 9 previously. Other method to prepare the gels was carried out by mixing water glass and chromium nitrate solutions and then the pH 4. The gel was characterized by ultraviolet-visible spectroscopy and transmission electron microscopic. The gel morphology is dependent on the pH value and the order of mixture of reagents. This effect is due to the nature of polymeric shape of chromium species in solution. Spherical particles can be obtained from microgel collapsing with high degree of cross linking . The second part of this work deals with powders obtained from gels. The chromium-containing silica and silica powders were obtained from gel by two methods: i) conventional heating at temperatures of 80 and 50oC and ii) sonication and heating at 80 and 50oC. The resultant colloidal silica was treated by continuous extraction acid solution in followed by extraction in distilled water and then dialyzed against distilled water and dried in microwave oven. The samples were...(Complete abstract, click electronic access below)
- Published
- 1997
31. Obtenção de sílica. Efeito de crômio, de temperatura e de ultra-som
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Martines, Marco Antonio Utrera [UNESP], Universidade Estadual Paulista (Unesp), and Davolos, Marian Rosaly [UNESP]
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Silica ,Química inorgânica - Abstract
Made available in DSpace on 2014-06-11T19:29:10Z (GMT). No. of bitstreams: 0 Previous issue date: 1993Bitstream added on 2014-06-13T20:38:31Z : No. of bitstreams: 1 martines_mau_me_araiq.pdf: 5390311 bytes, checksum: abb6d0e7406168f7c35f2d391d55abef (MD5) Sílica contendo crômio faz parte de uma classe importante de materiais, devido às suas aplicações como catalisadores de polimerização e oxidação, fibras ópticas e pigmentos. Alta pureza e partículas uniformes determinma propriedade físicas e químicas específicas de sílica para cada aplicação. São vários os métodos propostos para preparação de sílica-crômio, sendo a precepitação um dos métodos muito utilizados...
- Published
- 1993
32. Influência do pH na estabilidade dos coacervatos de prata como precursores vítreos
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Montanari, Bianca, primary, Vast, Pierre, additional, Martines, Marco Antonio Utrera, additional, Ribeiro, Sidney José Lima, additional, and Messaddeq, Younes, additional
- Published
- 2002
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33. O efeito do ultra-som em reações químicas
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Martines, Marco Antonio Utrera, primary, Davolos, Marian Rosaly, additional, and Jafelicci Júnior, Miguel, additional
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- 2000
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34. Effects of Different Treatments on Purity of Silica from Soluble Sodium Silicate
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MARTINES, MARCO ANTONIO UTRERA, primary, PECORARO, ÉDISON, additional, SIMONETI, JANDIRA APARECIDA, additional, DAVOLOS, MARIAN ROSALY, additional, and JAFELICCI, MIGUEL, additional
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- 2000
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35. Synthesis and characterization of lanthanides ion complexes with beta-diketonate and derivatives of pybox and chelidamic acid : optical probes for nitric oxide and temperature
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Cabral, Filipe Miranda, 1988, Sígoli, Fernando Aparecido, 1972, Sousa Filho, Paulo Cesar de, Pessine, Francisco Benedito Teixeira, Brito, Hermi Felinto de, Martines, Marco Antonio Utrera, Universidade Estadual de Campinas. Instituto de Química, Programa de Pós-Graduação em Química, and UNIVERSIDADE ESTADUAL DE CAMPINAS
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Luminescence ,Termometria ,Luminescência ,Lanthanides ,Nitric oxide ,Lantanídeos ,Thermometry ,Óxido nítrico - Abstract
Orientador: Fernando Aparecido Sigoli Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química Resumo: Esta tese teve como objetivo o desenvolvimento de novas sondas luminescentes que possam atuar como sensores de temperatura e óxido nítrico. Com esse objetivo foram sintetizados complexos com ligantes ß-dicetonatos (2-tenoiltrifluoroacetona) e ligantes auxiliares: ((2,2',6,6'-tetrametoxi-[3,3'-bipiridina]-4,4'-diil)bis(difenilfofisnóxido) e pirazino[2,3-f][1,10]fenantrolina). Do complexo {tris(tenoiltrifluoroacetonato)pirazino[2,3-f][1,10]fenantrolina} de európio(III), foi obtido um monocristal, onde foi observada desordem no grupo tiofeno do ligante ß-dicetonato e interação ¶-¶ entre a pirazino[2,3-f][1,10]fenantrolina e o anel tiofeno de uma molécula ß-dicetona. Este complexo teve seu comportamento fotoluminescente estudado em função da temperatura, obtendo uma sensitividade relativa máxima de 1,68 % K 1 em 323 K com faixa operacional de 283 a 323 K. Foram estudados também complexos com ligantes do tipo pybox onde foram variados os grupos ligados ao anel oxazolínico, utilizando os grupos tiofeno (tio), fenil (ph), benzil (bn) e iso-propil (ipr). Por métodos semi-empíricos e DFT, pode-se determinar que a simetria ao redor do íon lantanídeo se aproxima de D3. Dessa forma, apenas o grupo ligado ao pybox influenciou nas características de emissão do íon Eu3+, comprovado pela espectroscopia de fotoluminescência. A partir do ácido quelidâmico, foi sintetizado o ligante ácido-4-(3,4-diaminofenoxi)piridina-2,6-dicarboxílico e seu complexo com o Eu3+. Tal complexo foi utilizado como sonda óptica de NO. Avaliando a intensidade de emissão em solução houve aumento em duas ordens de grandeza na emissão em presença de NO, mostrando potencial para essa aplicação Abstract: This thesis aimed the development of new luminescent probes to act as sensors of nitric oxide and temperature. Based on this aim was synthesized complexes with ß-diketonate ligands (2-thenoyltrifluoroacetone) and auxiliary ligands: ((2,2 ', 6,6'-tetramethoxy- [3,3'-bipyridine] -4,4'-diyl ) bis (diphenylphosphine oxide) and pyrazine [2,3-f] [1,10] phenanthroline). From the complex {europium (III) tris (tenoyltrifluoroacetonate) pyrazine [2,3-f] [1,10] phenanthroline} was obtained from a single crystal, where a disorder was observed on the thyophen group of the ?-diketonate ligand and a ¶-¶ interaction between the pyrazine [2,3-f] [1,10] phenanthroline and the thyophen ring of a molecule of the ß-diketonate ligand. The dependence temperature of this complexes was studied too and was obtained a maximum relative sensitivity of 1.68% K-1 at 323 K with operation range from 283 to 323 K. It was studied too, complexes with pybox ligands where was varied the groups bonded to the oxazoline ring, was used, the phenyl (ph), benzyl (bn), iso-propyl (ipr) and thiophene (thio) groups. Using semi-empirical methods of calculations, we could determine the symmetry around the central ion, which was close to D3. By this way, just the group bonded to the pybox ligand influenced on the luminescent characteristics of the Eu3 +, which was showed by the luminescence spectroscopy. From the chelidamic acid was synthesized the 4- (3,4-diaminophenoxy) pyridine-2,6-dicarboxylic acid and its complex with Eu3 +. This complex was used as an optical probe to NO. Evaluating the emission intensity in solution was observed an increase of two orders of magnitude in the presence of NO, showing the potential to be applied as NO probe Doutorado Química Inorgânica Doutor em Ciências CNPQ 153319/2014-3
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- 2019
36. Juridical regulation of nanotechnology
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Nolasco, Loreci Gottschalk, Santos, Nivaldo dos, Martines, Marco Antonio Utrera, Neves, Cleuler Barbosa das, Araújo, Luciene Martins de, Tarrega, Maria Cristina Vidotte Blanco, and Pereira, Zefa Valdivina
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Nanotechnological risks ,Princípio constitucional da precaução ,Responsabilidade civil prospectiva ,Nanotecnologia ,Human health and environment ,Legal regulation ,DIREITO [CIENCIAS SOCIAIS APLICADAS] ,Nanotechnology ,Prospective liability ,Constitutional principle of precaution ,Riscos nanotecnológicos ,Regulamentação jurídica ,Saúde humana e meio ambiente - Abstract
INTRODUÇÃO. As pesquisas com o emprego da nanotecnologia surgem como uma das mais espetaculares possibilidades da ciência no Século XXI. Com habilidades de construir materiais, dispositivos e sistemas com precisão atômica, a nanotecnologia promete melhoria nas habilidades humanas, novas indústrias e produtos, resultados sociais e qualidade de vida, com possibilidades de produzir consideráveis impactos econômico-político-social-ambiental-jurídico. Estima-se que até 2020 serão movimentados mundialmente cerca de US$3 trilhões, com aproximadamente 20% de todos os produtos fabricados no mundo baseados, em certa medida, na utilização da nanotecnologia e que todo o setor de semicondutores e metade do setor farmacêutico dependa desses novos materiais; além de envolver diretamente seis milhões de empregos. Isso ocorre devido a sua incorporação em diversas tecnologias já existentes (física, química, biologia, medicina, eletrônica etc.), resultado de convergência tecnológica com capacidade de criação de novas formas de vida, porém com possibilidade no aumento dos riscos de forma ilimitada e incontrolável, o que permitiria, quando liberadas, interagirem de forma diferente com os sistemas vivos, provocando efeitos surpreendentes e unpredicted (que não é previsto), ou unpredictable (que é incapaz de ser previsto), além de potencialmente mais tóxicos do que a mesma massa de partículas equivalentes, convencionais e maiores. Dada a imprevisibilidade de seus resultados, devido às incertezas científicas sobre o entendimento de seus riscos relacionadas com o pequeno tamanho, área e química superficial, solubilidade e formato, nanopartículas poderiam causar perturbações em níveis molecular e celular. Semelhantes em tamanho às macromoléculas biológicas como proteínas, DNA e fosfolipídios, trazem consequências importantes, podendo levantar princípios éticos inteiramente inéditos em relação às demais biotecnologias. Estudos relatam potenciais efeitos toxicológicos de nanopartículas na saúde humana resultado de interações e alterações biológicas, físicas e químicas nos diversos sistemas funcionais orgânicos como respiratório, digestivo, nervoso, linfático, excretor, circulação sanguínea, pele, leite materno, músculos e placenta; além de contaminações no meio ambiente. Em específico estudo de caso sobre o uso de nanopartículas de dióxido de titânio em protetores solares, concluiu-se pela exposição tanto em ambientes profissionais ou entre a população em geral e nos organismos vivos (biota), em quase todas as fases do ciclo de vida, além de nenhuma via de exposição poder ser descartada como irrelevante para os trabalhadores. Apesar disso, encontra-se disponível para comercialização uma quantidade superior a 1.800 produtos e serviços dos mais diversificados, incluindo medicamentos, cosméticos e alimentos, contendo nanomateriais e nanopartículas, podendo expor a saúde e a segurança de consumidores e trabalhadores em nível global ao seu processo de fabricação e de comercialização. Pelo fato da nanotecnologia ser capaz de agir de uma forma fundamentalmente diferente em comparação com seu respectivo material em escala macro, tem-se que seria impossível inferir a segurança dos nanomateriais utilizando a informação derivada do material de origem a granel. No Brasil e na quase totalidade do Globo, não há legislação específica com exigências de novos e específicos métodos e instrumentos de avaliação quando um composto de produto de escala maior é substituído com o mesmo composto em nanoescala, ficando aspectos sanitários e de segurança, além de questões éticas, sociais e de governança, aquém do desenvolvimento da nanotecnologia. Apesar de não existir um quadro regulamentar específico para a área, quando os produtos são registrados em diferentes países, inclusive no Brasil, as respectivas agências reguladoras fazem-no de acordo com o seu tipo, em análise caso-a-caso, utilizando-se de normativas aplicadas em geral aos produtos químicos, medicamentos e cosméticos, mesmo não havendo nenhuma referência explícita aos nanomateriais. Representantes de várias organizações, governamentais ou não, e de grupos científicos, em âmbito nacional e internacional manifestam dúvidas quanto à capacidade regulamentar dos diplomas legais, normas de investigação e dos métodos e estratégias convencionais de aferição da toxicidade não específicos aplicados à nanotecnologia. OBJETIVOS. O objetivo específico da tese foi investigar se o sistema jurídico brasileiro é (in)suficiente para atender especificamente as inovações tecnológicas inerentes à nanotecnologia, com exigências de criação de metodologias para identificar, avaliar e gerenciar os prováveis riscos em todo ciclo de vida de nanomateriais e nanopartículas, através de instrumentos de prevenção e precaução, antes da introdução no mercado, de produtos, serviços e processos que contenham nanotecnologia. Entende-se que a regulamentação jurídica deva também exigir a adoção de medidas de adequado descarte dos resíduos da produção, além de estabelecer os procedimentos para responsabilização civil, criminal e administrativa dos envolvidos, quando for o caso. A finalidade da regulamentação jurídica é oferecer segurança jurídica aos consumidores e trabalhadores das presentes e futuras gerações (foco prospectivo) e ao meio ambiente. METODOLOGIA. O estudo teve por escopo a realização de pesquisa exploratória e bibliográfica através do levantamento de dados encontrados na literatura. Foram realizadas pesquisas bibliográficas por bases de dados em periódicos CAPES, consultando-se artigos originais e de revisão sobre o tema Nanotecnologia, Riscos, Regulação; além de livros específicos da área da Nanotecnologia e do Direito. Utilizou-se também do método analítico no estudo dos riscos nanotecnológicos, da responsabilidade civil prospectiva, do princípio da precaução e para a análise da legislação. Fundamentada na Constituição Federal de 1988, sob o paradigma do Estado Democrático de Direito, a pesquisa adotou a teoria garantista e substancialista do Direito, que se baseia na garantia e aplicação direta dos direitos fundamentais, indicando que agentes econômicos, empresas e Estado devem atentar-se aos preceitos mandamentais da Carta Constitucional e da legislação infraconstitucional, para, no mínimo, alcançar um padrão de conduta que atenda aos ditames dos direitos fundamentais, de tal forma que seja possível observar que o desenvolvimento econômico não é mais importante que o desenvolvimento humano, tanto um, quanto o outro, promessas das tecnologias convergentes. RESULTADOS E CONCLUSÕES. O avanço da ciência, particularmente no setor da biologia, engenharia genética, química, medicina, biotecnologia e nanotecnologia, impuseram e, continuam a impor ao Estado e ao Direito, a crescente vigilância quanto à possibilidade de riscos e danos perpetráveis à integridade física e mental de seres humanos, a fim de que o progresso científico compatibilize-se com as normas e princípios tutelares da personalidade humana, reconhecidos e firmados na Constituição de 1988, considerada, no atual paradigma de Estado Democrático de Direito, centro do sistema jurídico. O Direito como ciência, por meio do estabelecimento de instrumentos jurídicos deve criar medidas de gerenciamento preventivo e precaucional para o risco, baseado nos princípios constitucionais da informação e da responsabilização, essa que fundamenta a aplicação do princípio da precaução voltada para uma amplitude temporal (prospectiva) até então desconsiderada pelo Direito. Na prática, em termos jurídico-constitucionais, implica na obrigatoriedade de adoção de medidas de segurança e precaução adequadas, ordenadas e antecipatórias (legislação, instrumentos de avaliação e gestão de riscos), que limitem ou neutralizem a causação de danos, cuja irreversibilidade total ou parcial gera efeitos, danos e desequilíbrios negativamente perturbadores da sobrevivência condigna da vida humana e de todas as formas de vida centradas no equilíbrio e estabilidade dos ecossistemas naturais ou transformados. Atualmente a inovação em aplicações com nanotecnologia está procedendo à frente da política reguladora, levantando preocupações de que questões éticas, econômicas, jurídicas, sociais, toxicológicas e ambientais estão atrasadas ou defasadas. Essas preocupações desafiam, em nível global, governos, fabricantes e organizações civis a estabelecerem um sistema jurídico-legal que contemple novas metodologias de gestão e monitoramento de prováveis e alguns já comprovados riscos e danos ocorridos durante a cadeia produtiva e a pós-comercialização de produtos contendo nanomateriais e nanopartículas. Novas metodologias devem incorporar critérios de tamanho, forma, área de superfície, área de atividade e estrutura, além de exigir a construção de novos instrumentos de detecção, monitoramento e a caracterização adequada de nanomateriais, bem como os processos de compreensão que acontecem na superfície da nanopartícula quando em contato com os sistemas vivos, a fim de entender os possíveis efeitos toxicológicos, e, por conseguinte, contemplar as especificidades de controle e gerenciamento dos riscos em toda a cadeia produtiva e ciclo de vida de produtos e serviços com nanopartículas. Embora as exposições de trabalhadores, consumidores e dos ecossistemas em contato com aplicações e produtos contendo nanomateriais se encontrem em contexto de significativa gravidade, colocando trabalhadores a risco de exposição por inalação, absorção cutânea ou ingestão, e, apesar dos apelos à moratória para que governos e indústrias atentassem para a problemática gerada por tecnologias em convergências, a regulamentação jurídica da nanotecnologia avançou lentamente ao redor do globo. Inobstante, concluí-se que de forma reflexa e parcial pela via da interpretação integrativa da analogia legis, o ordenamento jurídico brasileiro oferece regulamentação à nanotecnologia, para identificação da responsabilidade, mensuração dos parâmetros, sanção e estabelecimento de condutas precavidas no trato para com o risco nanotecnológico, em especial por estabelecerem o princípio da precaução, como a Lei de Biossegurança nº. 11.105/2005; a Política Nacional de Resíduos Sólidos nº. 12.305/2010; de Atividades Nucleares nº. 6.453/1977, além da prática jurisprudencial com aplicação de tratados internacionais ratificados pelo Brasil, antes e após a promulgação da Constituição Brasileira de 1988, entre eles, a Agenda 21 (1992) e o Protocolo de Cartagena sobre Biossegurança (2000) e, do recurso aos princípios constitucionais inspiradores do sistema da analogia juris, como o princípio da precaução fundamentado pela obrigação geral de segurança e da reparação integral dos danos, da preservação da dignidade humana, do respeito à vida e à saúde. Soma-se que, normativas não vinculantes juridicamente (soft law) desenvolvidas por organizações econômicas e de padronizações internacionais (códigos de conduta e responsabilidade) para o desenvolvimento, comercialização e gestão de riscos da nanotecnologia, podem complementar a regulamentação de comando e controle estatal. De sorte que as partes interessadas em nanotecnologia devem levar em consideração no momento em que empenham esforços e recursos nesse sentido alguns parâmetros para orientar sua atividade, bem como observar o que representam para a sua atividade as externalidades da regulamentação jurídica. A pesquisa aponta princípios e indicadores que devem ser implantados como medidas de supervisão e de gerenciamento preventivo dos riscos da nanotecnologia e nanomateriais, a fim de garantir o seu desenvolvimento seguro, dentre os quais, destaca-se a abordagem precaucional e regulamentos específicos obrigatórios. Apontam-se também algumas propostas estratégicas de gestão de riscos, incluindo controles no local de trabalho, programas voluntários e seguros. Concluí-se que a gestão de riscos para proteção e promoção da atividade de pesquisa e dos seus titulares, bem como para preservar a qualidade de vida do ser humano e do ambiente em geral, poderá ser feita em vários níveis, incluindo as agências reguladoras governamentais na definição de normas ambientais, de saúde e de segurança, as empresas na implementação de programas de manejo industrial de higiene e produtos e as seguradoras na formulação de políticas de cobertura e preços. Permanece, contudo, o desafio jurídico brasileiro em regulamentar específica e abrangentemente a nanotecnologia ou promover a adaptação em especial das leis de biossegurança e de resíduos sólidos para seu adequado descarte, envolvendo a geração de novas metodologias e protocolos com abordagem multidisciplinar, principalmente entre a química, responsável pela síntese, quantificação e caracterização dos materiais, a biologia e a medicina, na concepção dos ensaios e na interpretação dos resultados a fim de se identificar e avaliar sistematicamente materiais e processos alternativos mais seguros, e com isso, antecipar os riscos potenciais de produtos e processos contendo nanopartículas e nanomateriais, atentando-se para a Constituição Federal de 1988 de viés garantista, e dirigente para o campo da formulação, interpretação e aplicação das leis, que vincula todos os poderes estatais (Executivo, Legislativo e Judiciário), indústrias, cientistas, laboratórios, universidades e demais partes interessadas no desenvolvimento da nanotecnologia, com propósito de garantir que a sociedade venha desfrutar dos benefícios econômicos e sociais generalizados que a nanotecnologia promete oferecer. INTRODUCTION. Research on the nanotechnology jobs emerge as one of the most spectacular possibilities of science in the twenty-first century. With skills of building materials, devices and systems with atomic precision, nanotechnology promises to improve human skills, new industries and products, social outcomes and quality of life, with the potential to produce considerable economic-political-social-environmental and legal impacts. It is estimated that by 2020 will be moved globally about $ 3 trillion, with about 20% of all manufactured products in the world based to some extent, the use of nanotechnology and that all semicondutores sector and half of the pharmaceutical industry relies upon new materials; besides directly involved six million jobs. This is due to its incorporation into various existing technologies (physics, chemistry, biology, medicine, electronics etc.), the result of technological convergence with ability to create new forms of life, but with the possibility to increase the risk of unlimited and unmanageable, which would, if released, interact differently with living systems, causing surprising effects and unpredicted (which is not provided) or unpredictable (which is unable to be provided), and potentially more toxic than the same mass equivalent conventional and larger particles. Given the unpredictability of its results due to scientific uncertainties about the understanding of the risks related to the small size, area and surface chemistry, solubility and size, nanoparticles could cause disturbances in molecular and cellular levels. Similar in size to biological macromolecules such as proteins, DNA and phospholipids, have important consequences and can lift entirely unprecedented ethical principles in relation to other biotechnologies. Studies have reported potential toxicological effects of nanoparticles on human health result of interactions and biological, physical and chemical changes in various organic functional systems such as respiratory, digestive, nervous, lymphatic, excretory, blood circulation, skin, breast milk, muscle and placenta; as well as contamination of the environment. In the specific case study on the use of titanium dioxide nanoparticles in sunscreens, it was concluded by exposing both in professional environments or between the population groups and living organisms (biota), almost all phases of the lifecycle, and no exposure pathway can be dismissed as irrelevant to the workers. Nevertheless, is available for sale a quantity greater than 1,800 products and services of the most diverse, including medicines, cosmetics and foods containing nanomaterials and nanoparticles, and may expose the health and safety of consumers and workers globally to your process manufacturing and marketing. Because nanotechnology be able to act in a fundamentally different way compared to their respective material macro scale, it has been impossible to infer the safety of nanomaterials using the information derived from the bulk source material. In Brazil and almost the entire globe, there is no specific legislation with requirements of new and specific methods and assessment tools when a compound product of larger scale is replaced with the same compound nanoscale, getting health and safety aspects, and ethical, social and governance issues, short of nanotechnology development. Although there is no specific regulatory framework for the area where the products are registered in different countries, including Brazil, the respective regulatory agencies do it according to its type, in case-by-case basis, using normative applied generally to the chemicals, pharmaceuticals and cosmetics, even without any explicit reference to nanomaterials. Representatives of various organizations, governmental or not, and scientific groups, national and international express doubts about the ability of regulatory legislation, research standards and methods and conventional measurement strategies of non-specific toxicity applied to nanotechnology. GOALS. The specific aim of the thesis was to investigate whether the Brazilian legal system is (in) sufficient to specifically meet the technological innovations inherent in nanotechnology, with demands for creation of methodologies to identify, evaluate and manage the possible risks throughout the life cycle of nanomaterials and nanoparticles through prevention and precautionary instruments before placing on the market of products, services and processes that contain nanotechnology. It is understood that the legal regulations should also require the adoption of proper disposal of waste production measures, and to establish procedures for civil liability, criminal and administrative those involved, if applicable. The purpose of the legal regulation is to provide legal certainty for consumers and employees of present and future generations (prospective focus) and the environment. METHODOLOGY. The study had the scope to carry out exploratory and bibliographic research through survey data in the literature. Literature searches were performed by databases CAPES, is consulting with original and review articles on the subject Nanotechnology, Risk, Regulation; as well as specific books of Nanotechnology Area and Law. We also used the analytical method in the study of nanotechnology risks, the prospective liability, the precautionary principle and the analysis of the legislation. Based on the 1988 Federal Constitution, under the paradigm of democratic rule of law, the survey adopted the garantista theory and substantialist of law, which is based on the guarantee and direct application of fundamental rights, indicating that economic agents, companies and state should pay attention the mandamentais precepts of the Constitutional Charter and the infra-constitutional legislation, to at least achieve a standard of conduct that meets the dictates of fundamental rights, so it is possible to observe that economic development is not more important than human development, both one and the other, promises of converging technologies. RESULTS AND CONCLUSIONS. The advance of science, particularly in the sector of biology, genetic engineering, chemistry, medicine, biotechnology and nanotechnology, have imposed and continue to impose the state and the law, increased vigilance for possible risks and perpetráveis damage to physical and mental integrity human beings, so that scientific progress reconciles with the standards and tutelary principles of human personality, recognized and established in the 1988 Constitution, considered in the current democratic state paradigm of law, the center of the legal system. The Law as a science, through the establishment of legal instruments must create preventive and precautionary management measures for risk, based on the constitutional principles of information and accountability, the one that underlies the principle of focused caution for a time span (prospective) so far disregarded the law. In practice, in legal and constitutional terms, it implies the obligation to adopt appropriate safety and precautionary measures ordered and anticipatory (legislation, assessment tools and risk management), which limit or neutralize the causation of damage with a total irreversibility or generates partial effects negatively disturbing damage and imbalances of the decent survival of human life and all forms of life centered on the balance and stability of natural ecosystems or processed. Currently innovation in nanotechnology applications is proceeding ahead of regulatory policy, raising concerns that ethical, economic, legal, social, toxicological and environmental issues are delayed or lagged. These concerns challenge, globally, governments, manufacturers and civil organizations to establish a legal and judicial system that addresses new methods of management and monitoring of probable and some proven risks and damage during the production chain and post-marketing products and nanoparticles containing nanomaterials. New approaches must incorporate criteria of size, shape, surface area, activity and structure area, and require the construction of new detection tools, monitoring and adequate characterization of nanomaterials, as well as the understanding of processes occurring on the surface of nanoparticle when in contact with living systems in order to understand the possible toxicological effects, and therefore address the specificities of control and risk management throughout the production chain and life cycle of products and services with nanoparticles. Although exposures of workers, consumers and ecosystems contact applications and products containing nanomaterials are subject to a significant gravity context, putting workers at risk of exposure through inhalation, skin absorption or ingestion, and despite calls for moratorium on governments and atentassem industries to the problems generated by technologies convergence, the legal regulation of nanotechnology inched around the globe. Inobstante, concluded that reflex and partially by means of integrative interpretation of legis analogy, the Brazilian legal system provides regulations to nanotechnology, to identify responsibility, measurement of parameters, penalty and establishment of cautious conduct in dealings with the risk nanotechnology, in particular by establishing the precautionary principle, such as the Biosafety Law no. 11,105 / 2005 the National Policy on Solid Waste no. 12,305 / 2010; Nuclear Activities no. 6,453 / 1977, as well as judicial practice with the application of international treaties ratified by Brazil, before and after the enactment of the Brazilian Constitution of 1988, including, Agenda 21 (1992) and the Cartagena Protocol on Biosafety (2000) and the recourse to constitutional principles inspiring the juris analogy of the system, the principle of reasoned caution to the general safety requirement and full compensation of the damage, the preservation of human dignity, respect for life and health. Added to that, normative not legally binding (soft law) developed by economic organizations and international standardization (codes of conduct and responsibility) for the development, marketing and nanotechnology risk management, can complement the control regulation and state control. So that stakeholders in nanotechnology should take into consideration at the time committed efforts and resources in that sense some parameters to guide its activities and observe what they represent for their activity externalities of legal regulation. The research points principles and indicators that should be deployed as supervisory measures and preventive management of risks of nanotechnology and nanomaterials in order to ensure its safe development, among which stands out the precautionary approach and mandatory specific regulations. They also point out some strategic proposals for risk management, including controls in the workplace, volunteer programs and insurance. It concluded that the risk management for protection and promotion of research activity and its holders, as well as to preserve the quality of life of the human being and the environment in general, can be made at various levels, including government regulatory agencies the definition of environmental, health and safety, companies in the implementation of industrial management programs and hygiene products and insurers in the formulation of coverage policies and prices. It remains, however, the Brazilian legal challenge in specific regulatory and comprehensively nanotechnology or promote adaptation in particular the biosafety laws and solid waste for its proper disposal, involving the generation of new methodologies and protocols with a multidisciplinary approach, between principalmente chemistry, responsible for the synthesis, quantification and characterization of materials, biology and medicine, the design of the trials and interpretation of results in order to identify and evaluate systematically materials and safer alternative processes, and thus, anticipate the risks potential products and processes containing nanoparticles and nanomaterials, paying attention to the Federal Constitution of 1988 garantista bias, and head to the field of formulation, interpretation and application of laws, which binds all state powers (executive, legislative and judicial) , industries, scientists, laboratories, universities and other stakeholders in the development of nanotechnology, with purpose to ensure that the company will enjoy the economic and social benefits that nanotechnology promises widespread offer.
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- 2016
37. Lanthanide complexes dispersed or anchored in polydimethylsiloxane : potential optical probes for temperature and oxygen sensors
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Rafael Di Lazaro Gaspar, Sígoli, Fernando Aparecido, 1972, Dias, Ana Maria Bettencourt de Freitas, Martines, Marco Antonio Utrera, Formiga, André Luiz Barboza, Raimundo Júnior, Ivo Milton, Universidade Estadual de Campinas. Instituto de Química, Programa de Pós-Graduação em Química, and UNIVERSIDADE ESTADUAL DE CAMPINAS
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Oxygen ,Luminescence ,Oxigênio ,Sensors ,Compostos de coordenação ,Luminescência ,Temperature ,Coordination compounds ,Temperatura ,Detectores - Abstract
Orientador: Fernando Aparecido Sigoli Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química Resumo: Este trabalho de tese consiste na síntese e caracterização de complexos contendo os ligantes 2-tenoiltrifluoroacetona (tta), alildifenilfosfinóxido (adppo), difenilestirenofosfinóxido (dfepo) e ácido 3,5-diclorobenzóico (3,5-dcba) com os íons La(III), Eu(III), Gd(III), Tb(III) e Eu(III). Tais complexos foram ancorados e/ou dispersos em polidimetilsiloxano (pdms) funcionalizado ou não com o grupo fosfinóxido que após cura levou a membranas luminecentes. Tais membranas foram avaliadas como sondas óticas em ensaios de variação de temperatura e de concentração de oxigênio. ... Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital Abstract: This work consists in the synthesis and characterization of Ln(III) (La(III), Eu(III), Gd(III)and Tb(III)) complexes with the ligands 2-thenoiltrifluoroacetone (tta), allyldiphenylphosphine oxide (adppo), diphenylstyrenephosphine oxide (dfepo) and 3,5-diclhorobenzoic acid. These complexes were anchored and/or dispersed in phosphine oxide functionalized/non-functionalized polydimethylsiloxane (pdms), respectively, which after crosslink yield luminescent self-supported membranes. ... Note: The complete abstract is available with the full electronic digital thesis or dissertation. Doutorado Química Inorgânica Doutor em Ciências
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- 2014
38. Síntese e caracterização do sistema vítreo (1-x) NaPO 3 – (x)WO 3
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Teiga, Bruno Cesar [UNESP], Universidade Estadual Paulista (Unesp), and Martines, Marco Antonio Utrera [UNESP]
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Vidros fostatos ,Sintese ,Impedância ,Tungstenio ,Caracterização estrutural - Abstract
Made available in DSpace on 2014-06-11T19:25:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-05-04Bitstream added on 2014-06-13T19:12:26Z : No. of bitstreams: 1 teiga_bc_me_ilha.pdf: 3905008 bytes, checksum: dd167bfe0a0f86595ebe3d53b076b784 (MD5) Os vidros fosfatos contendo óxido de tungstênio apresentam grande interesse tecnológico devido às suas propriedades térmicas, mecânicas, ópticas e elétricas obtidas pela inserção de átomos de tungstênio dentro da rede vítrea. Neste trabalho foram preparadas amostras vítreas do sistema binário pelo método convencional fusão-resfriamento, variando x = 0, 10, 30 e 60. Os materiais inicialmente em pó foram misturados e aquecidos à temperatura de 400°C por 1h para a remoção de água e gases adsorvidos. Então, foram fundidos à temperatura de 1100°C, o líquido resultante foi mantido a esta temperatura por 1 h para garantir a homogeneização e finalmente o material fundido foi rapidamente resfriado em um molde de latão pré-aquecido abaixo da temperatura de transição vítrea. O recozimento foi realizado nesta temperatura por 1 h para minimizar as tensões mecânicas. As propriedades dielétricas e a dependência da condutividade com a composição química, temperatura e freqüência foram avaliadas pela espectroscopia de impedância (IS). Um mecanismo de condução iônico foi observado para composições de WO3 < 30 %mol. Uma mistura entre os mecanismos de condução iônica e eletrônica foi observada para WO3 > 30 %mol. Aglomerados das unidades de WO6 foram observados nas amostras contendo grandes quantidades de WO3 sugerindo uma possível conexão entre estes aglomerados e os mecanismos de condução. As técnicas espectroscopia no infravermelho com transformada de Fourier (FT-IR) e difração de raios-X foram usadas para a caracterização no presente trabalho. Tungsten oxide containing-phosphate glasses present interesting technological because of the specific thermal, mechanical, optical and electrical properties obtained by insertion of tungsten atoms inside the glass network. Vitreous samples of binary system (100 – x) NaPO3 – (x) WO3 were prepared by conventional melt-quenching, varying x = 0, 10, 30 and 60. The powdered starting materials were mixed and heated at 400°C for 1 h to remove water and adsorbed gases. Then, they were melted at temperature around 1100°C, the resulting liquid was keep at that temperature for 1 h to ensure homogenization and finally the melt was rapidly cooled in a brass mold preheated below the glass transition temperature. Annealing was implemented at this temperature for 1 h to minimize mechanical stress. Dielectrics properties and the dependence of the conductivity with chemical composition, temperature and frequency have been evaluated by impedance spectroscopy (IS). An ionic conduction mechanism was observed for composition of WO3 < 30 mol%. A mixed electronic and ionic conductivity mechanism was observed for WO3 > 30 mol%. Clusters of WO6 units were observed in samples with high WO3 content and a possible connection between these clusters and the conduction mechanism has been suggested. In the present work the techniques Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XDR) was used for characterization.
- Published
- 2009
39. Interação do complexo luminescente [Eu(tta)3] com sílica mesoporosa
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Saliba, Lucas Falquetti [UNESP], Universidade Estadual Paulista (Unesp), Martines, Marco Antonio Utrera [UNESP], and Castro, Gustavo Rocha de [UNESP]
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Europio ,Luminescence ,Europium ,Silica ,Mesoporous silica ,Luminescencia - Abstract
Made available in DSpace on 2014-06-11T19:25:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-03-06Bitstream added on 2014-06-13T20:53:37Z : No. of bitstreams: 1 saliba_lf_me_ilha.pdf: 2689127 bytes, checksum: 77157443fa70337c82aeb80e43ec516e (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) A sílica mesoporosa do tipo MSU-4 foi sintetizada a partir do agente direcionador de estrutura Tween 20, utilizado como molde, e do precursor inorgânico tetraetilortosilicato (TEOS). Estruturas mesoporosas tem sido aplicadas em estudos luminescentes por apresentarem alto índice de organização, grande área superficial e distribuição regular de tamanho de poros. Nesse trabalho a sílica mesoporosa foi funcionalizada com 3-aminopropiltrietoxisilano (APTES) para aplicação luminescente. A sílica mesoporosa funcionalizada foi caracterizada por difração de raios-X a baixo ângulo (SAXS), espectroscopia no infravermelho (FT-IR) e adsorção e dessorção de nitrogênio (BET). O material luminescente foi preparado pela formação do complexo [Eu(tta)3] em meio metanólico e impregnado nos canais da sílica mesoporosa. Para a impregnação, o íon Eu3+ foi primeiramente encapsulado na sílica e posteriormente foi adicionado o ligante 2- tenoiltrifluoroacetona (tta). Esse procedimento foi realizado para as sílicas lavada, calcinada e funcionalizada. Uma amostra de sílica funcionalizada foi preparada com a impregnação do complexo já pronto. Todas as amostras foram caracterizadas por espectroscopia luminescente. O estudo espectroscópico foi realizado à temperatura ambiente e os espectros de excitação mostraram a absorção de energia pelo ligante tta na faixa do ultravioleta. Os espectros de emissão mostraram as transições características do íon Eu3+, dos estados de maior energia 5D0 para os de menor energia 7F0-4. Foi observado que a transferência de energia do ligante para o íon Eu3+ foi eficiente. A transição hipersensitiva 5D0→7F2 mostrou o efeito das diferentes superfícies da matriz de sílica. PALAVRAS CHAVE: Sílica mesoporosa, luminescência, európio. MSU-4 type mesoporous sílica has been synthesized with polyoxyethylenesorbitan monolaurate (Tween 20) as structure-directing agent (MTS) as a template and tetraethyl orthosilicate Si(OEt)4 (TEOS) as silica source. The mesoporous structures have a wide application in the luminescence study because of their organization, large surface area, and size of pores. In this work, MSU-4 mesoporous silica was functionalized with 3-amino-propyl-triethoxysilane (APTES) for luminescence applications. Mesoporous silica and amino-functionalized silica was characterized by small-angle X-ray scattering (SAXS), infrared spectroscopy (FT-IR) and nitrogen adsorption/desorption isotherms at 77 K (BET). A luminescent material was prepared by formation of the complex Eu(tta)3 in methanolic medium within the channels of MSU-4 type ordered mesoporous silica. Using simple wet impregnation methods, the europium ion was first encapsulated followed by ligand 2-thenoyltrifluoracetonate (tta) addition. This process it was done for washed, calcined and functionalized mesoporous silica. Analogous one sample of functionalized silica was impregnated with the complex already ready. All samples were characterized by photoluminescence spectroscopy. The spectroscopy studies in room temperature showed the energy absorption of the ligand range ultraviolet in excitation spectra. The emission spectra this materials displayed the typical Eu3+ intra-4f6 lines ascribed to transitions between the 5D0,1 excited states and the ground multiplet (7F0-4). Negligible emission from the organic part of the encapsulated species was observed, indicating that energy transfer from the ligands to the Eu3+ ion was quite efficient. The hypersensitive 5D0→7F2 line showed the mesoporous silica effect in luminescence europium chelate.
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- 2009
40. Electrochemical Determination of Norepinephrine by Means of Modified Glassy Carbon Electrodes with Carbon Nanotubes and Magnetic Nanoparticles of Cobalt Ferrite.
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Queiroz DF, Dadamos TRL, Machado SAS, and Martines MAU
- Abstract
This study describes the electrochemical preparation of the electrocatalytic oxidation/reduction of noradrenaline in modified glassy carbon of cobalt ferrite nanoparticles and carbon nanotubes (GC/MWCNT/FCo
98 ). The cobalt ferrite powder was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The optimum conditions found in an electrode composition were 4 μL of cobalt ferrite and 10 μL of carbon nanotubes in 0.1 mol L-1 PBS at pH 7.0. The electrode displays electrochemical behavior in a wide potential range (-0.4 to 1.0 V vs. Ag/AgCl), high conductivity, and electrode stability/durability in 0.1 mol L-1 PBS. Catalytic oxidation of noradrenaline was performed at the unmodified GC electrode at +0.60 V vs. Ag/AgCl and current of 0.17 μA and modified GC with cobalt ferrite nanoparticles and carbon nanotubes at +0.54 V vs. Ag/AgCl and current of 0.23 mA. With regard to the anodic peak current ( Ipa ) versus noradrenaline concentration by means of the amperometric method at the modified electrode, (which is linear in the 0.16 and 1.91 mmol L-1 concentration range), the concentration limit was 0.76 μmol L-1 . In this way, the modified electrode GC/MWCNT/FCo98 was found to be a promising application for the determination of this neurotransmitter in the area of neuroscience.- Published
- 2018
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- View/download PDF
41. Application of mesoporous SBA-15 silica functionalized with 4-amino-2-mercaptopyrimidine for the adsorption of Cu(II), Zn(II), Cd(II), Ni(II), and Pb(II) from water.
- Author
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Jorgetto Ade O, Pereira SP, Silva RI, Saeki MJ, Martines MA, Pedrosa Vde A, and Castro GR
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- Adsorption, Copper chemistry, Lead chemistry, Nickel chemistry, Particle Size, Porosity, Surface Properties, Zinc chemistry, Pyrimidines chemistry, Silicon Dioxide chemistry, Sulfhydryl Compounds chemistry, Water chemistry
- Abstract
This work reports the sol-gel synthesis of a SBA-15 silica, and its functionalization with 4-amino-2-mercaptopyrimidine to perform adsorption of metal species from aqueous media. The functionalization of the material was confirmed by FTIR and superficial area measurements. The final material was tested through batch experiments to uncover its adsorptive properties towards the adsorption of Cu(II), Cd(II), Zn(II), Pb(II) and Ni(II). Contact time and pH conditions were investigated, and the material presented slow adsorption kinetics, which was best described by the pseudo-second order model. In addition, at pH 5 - 6, the adsorption of the metal ions was favored. Under optimized conditions, the material had its maximum adsorption capacities determined for all metal species studied, and the obtained values were 13.0 µmol g(-1) for Zn(II), 12.3 µmol g(-1) for Cu(II), 3.45 µmol g(-1) for Ni(II), 2.45 µmol g(-1) for Pb(II) and 0.60 µmol g(-1) for Cd(II). The capacity differences between each metal ion were discussed in terms of their ionic radii and Person's soft/hard acids/bases concept.
- Published
- 2015
- Full Text
- View/download PDF
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