24 results on '"Nogueira, Telma"'
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2. Development and Internal Validation of a Questionnaire Assessing Predisposition to Nonadherence to Immunosuppressive Medication in Kidney Pretransplant Patients
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Oliveira, Luana Cristina Lins de Medeiros, Tavares, Raquel Padilha Martins, Moreira, Francisca Sueli Monte, Nóbrega, Ítala Morgânia Farias da, Nogueira, Telma Cristiane Cavalcanti, Oliveira, Alene Barros de, Batista, Lorena de Medeiros, Martins, Rand Randall, and Oliveira, Antonio Gouveia
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- 2024
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3. Co-Creation and Implementation of a Healthy Snacks Policy in Primary Schools: Data from Sintra Grows Healthy.
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Nogueira, Telma, Ferreira, Raquel J., Pinto, Mariana Liñan, Dias da Silva, Vitória, Nogueira, Paulo Jorge, and Sousa, Joana
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Policy interventions in the school food environment can improve dietary behaviors. However, the literature describing its development and implementation is scarce. This manuscript aims to describe the process of co-creation, implementation, monitoring, and evaluation of a Healthy Snacks Policy, in the scope of Sintra Grows Healthy intervention. Through a community-based participatory research methodology, the co-creation of the Healthy Snacks Policy comprises six stages: snacks evaluation, feedback sessions, class assemblies, school community assemblies, school cluster policy approval, and process evaluation. Within one school year, a Healthy Snacks Policy was co-created, approved, incorporated in the school regulations, implemented, continuously monitored, and evaluated. Regarding snacks evaluation, 1900 snacks were evaluated at the beginning of the school year and 1079 at the end of the school year. There were three feedback sessions, twenty-two class assemblies, and three school community assemblies. Most teachers perceived that children began to consume healthier snacks (72%); 66% of the children were considered to have started eating healthier; and most families said "yes or sometimes" when asked whether their children started requesting healthier snacks (70%), trying new foods (63%), and noticing improvements in their eating habits (74%). The co-creation of a Healthy Snacks Policy establishes an approach to effectively implement existing guidelines for school food supplies, complying with national priority implementation recommendations. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Effect of Layered Hydroxide Salts, Produced by Two Different Methods, on the Mechanical and Thermal Properties of Poly(Methyl Methacrylate)
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Nogueira, Telma, Wypych, Fernando, Mei, Lucia, and Lona, Liliane
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Polymethyl methacrylate -- Chemical properties -- Mechanical properties -- Thermal properties ,Hydroxides -- Chemical properties -- Usage ,X-ray diffraction ,Polymerization ,Methyl methacrylate ,Ethylene glycols ,Glycols (Class of compounds) ,Engineering and manufacturing industries ,Science and technology - Abstract
In this study, eight different layered hydroxide salts (LHSs) based on copper and zinc, intercalated with stearate, myristate, azelate, and poly(ethylene glycol) (PEG) monolaurate, were prepared. All the LHSs were produced according two different methods: co-precipitation (direct method) and synthesis of zinc hydroxide nitrate (ZHN) and copper hydroxide nitrate (CHN) followed by exchange reaction (indirect method). The synthetic layered compounds were characterized by X-ray diffraction (XRD) and thermogravimetric analysis (TGA). TGA results revealed that higher thermal stability was observed for the LHSs synthesized by direct method. The effects of all these LHSs on the thermal and mechanical properties of poly(methyl methacrylate) (PMMA) nanocomposites were investigated. The LHSs percentage (wt%) in the PMMA was fixed at 1%. PMMA and PMMA nanocomposites were produced by in situ bulk polymerization. Compared to PMMA, all the nanocomposites exhibited higher thermal stability. The nanocomposite containing ZHN(stearate) by indirect method revealed both [T.sub.50] (temperature at which a 50% loss of mass occurs) and [T.sub.90] (temperature at which a 90% loss of mass occurs) 71[degrees]C higher than PMMA. Compared to PMMA, the nanocomposite with ZHN(PEG monolaurate) exhibited an increase of 14% in the elastic modulus, at 30[degrees]C., INTRODUCTION Polymer/clay nanocomposites have been shown to provide enhancements in physical properties of polymers such as increased tensile strength, tensile modulus, flexural strength, thermal stability, and corrosion protection due to [...]
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- 2019
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5. A school-based intervention for a better future: study protocol of Sintra Grows Healthy
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Ferreira, Raquel J., Nogueira, Telma, Dias da Silva, Vitória, Liñan Pinto, Mariana, Sousa, Joana, Pereira, Ana Margarida, Nogueira, Paulo Jorge, Borrego, Rute, Raposo, Ana, Martins, João, Onofre, Marcos, Marques, Adilson, Rodrigues, António, Quitério, Ana, and Pereira, António
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- 2020
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6. Study of thermal and mechanical properties of PMMA/LDHs nanocomposites obtained by insitu bulk polymerization
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Nogueira, Telma, Botan, Rodrigo, Wypych, Fernando, and Lona, Liliane
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- 2011
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7. Sintra Grows Healthy: development and implementation of a food literacy curriculum for primary schools
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Nogueira, Telma, Ferreira, Raquel J, Sócrates, Marta, Dias da Silva, Vitória, Liñan Pinto, Mariana, Borrego, Rute, Sousa, Joana, and Repositório da Universidade de Lisboa
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School ,Nutrition and Dietetics ,Nutrition education ,Nutritional education ,Public Health, Environmental and Occupational Health ,Medicine (miscellaneous) ,Food literacy ,Health promotion ,Curriculum ,Nutrition - Abstract
© The Author(s), 2022. Published by Cambridge University Press on behalf of The Nutrition Society. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited., Objective: Describe the process of development and implementation of Health at the Table - a food literacy curriculum for primary school aged children. Design: Through a community-based research process, Health at the Table development and implementation took place in four stages: exploratory study, production, implementation and monitoring. Setting: Primary schools of Sintra's municipality, Portugal. Participants: Children (6-10 years), teachers, school staff and children's legal guardians of three primary schools during the pilot project and eight primary schools in the second year. Results: During the needs assessment phase, 99·1 % (n 341) of the children's legal guardians, 100 % (n 34) of the teachers and 100 % (n 19) of the school staff considered that the school plays an important or very important role in children's food literacy (stage 1). During the pilot project, a manual with sixty session plans was developed (stage 2). In the second year, Health at the Table was implemented by seventy-two trained teachers during one school year (stage 3). Most of the teachers agreed that the curriculum was appropriate (69·2 %) and that children developed health, wellness/well-being and environmental skills (83·1 %). Most of the children said they had learned about healthy eating (86·3 %) and claimed to eat healthier since the Health at the Table implementation (58·9 %) (stage 4). Conclusions: Health at the Table is a food literacy curriculum that can be reproduced in similar contexts in a sustainable way. The need to combine educational strategies with a healthy school food environment is reinforced to increase effectiveness in tackling childhood obesity.
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- 2022
8. Sintra Grows Healthy: Development and implementation of a food literacy curriculum for primary schools
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Nogueira, Telma, primary, Ferreira, Raquel J., additional, Sócrates, Marta, additional, Dias da Silva, Vitória, additional, Liñan Pinto, Mariana, additional, Borrego, Rute, additional, and Sousa, Joana, additional
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- 2022
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9. Síntese de nanocompósitos a partir de metacrilato de metila e hidróxidos duplos lamelares
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Nogueira, Telma Regina, Lona, Liliane Maria Ferrareso, 1966, Wypych, Fernando, Sayer, Claudia, Giordani, Domingos Savio, Marangoni, Rafael, Santos, Paula Sbaite Duarte dos, Universidade Estadual de Campinas. Faculdade de Engenharia Química, Programa de Pós-Graduação em Engenharia Química, and UNIVERSIDADE ESTADUAL DE CAMPINAS
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Nanocompósitos (Materiais) ,PMMA ,PMMA1 ,Nanocomposites - Abstract
Orientadores: Liliane Maria Ferrareso Lona, Fernando Wypych Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química Resumo: Recentemente, nanocompósitos poliméricos reforçados com argilominerais têm atraído considerável interesse científico. A maioria dos trabalhos publicados sobre a produção de nanocompósitos poliméricos utiliza silicatos naturais lamelares da classe dos filosilicatos do tipo 2:1, como a montmorilonita e a hectorita, como agentes de reforço. Para permitir a compatibilização com polímeros hidrofóbicos, já que os filosilicatos são hidrofílicos, utiliza-se normalmente a montmorilonita modificada com surfactantes catiônicos (sais quaternários de amônio, por exemplo), como reforço. Outra classe de trocadores aniônicos é a dos hidróxidos duplos lamelares (HDLs), que raramente ocorrem na natureza, mas são muito simples e baratos de sintetizar. Neste trabalho de doutorado foi investigada a polimerização "in situ" de metacrilato de metila com hidróxidos duplos lamelares modificados com ânions orgânicos (dodecilsulfato, estearato e laurato). Há poucos estudos em literatura aberta sobre as propriedades mecânicas e térmicas dos nanocompósitos de PMMA reforçados com HDLs e até agora não foram encontrados estudos sobre nanocompósitos de PMMA reforçados com HDLs intercalados com ânions estearato. O laboratório iniciou o estudo nesta área de nanocompósitos recentemente, no entanto, já foram produzidos alguns resultados sobre as propriedades de nanocompósitos de poliestireno e hidróxidos duplos lamelares. No presente trabalho foram produzidos nanocompósitos com alta transparência na região espectral da radiação visível assim como nanocompósitos coloridos, sem a adição de pigmentos ou corantes. Através de resultados de análises termogravimétricas demonstrou-se que a adição de HDLs pode aumentar a temperatura de decomposição do PMMA em mais de 80°C. Os resultados de análise dinâmico-mecânica mostraram que a concentrações de HDLs de 1% em massa nos nanocompósitos foi possível obter módulos elásticos com valores mais do que o dobro daqueles obtidos para o PMMA na maior parte da faixa de temperatura estudada. Com o objetivo de avaliar como a concentração de HDL afetava as propriedades anteriormente avaliadas, foram sintetizados nanocompósitos poliméricos contendo seis diferentes HDLs pré-selecionados, em duas diferentes concentrações (3% e 5%). Estes resultados demonstraram que a maioria destes nanocompósitos apresentou valores de microdureza maiores do que os encontrados para o PMMA Abstract: Recently, nanocomposites consisting of polymer and mineral clays have attracted considerable scientific interest. Most published works on the production of polymer nanocomposites use clay mineral fillers such as montmorillonite, modified with cationic surfactants. Another class of anionic exchanger is layered double hydroxides (LDH), which rarely occur in nature but are very simple and inexpensive to synthesize, allowing the production of highly defined composition material. In this study we have investigated "in situ" bulk polymerization of methyl methacrylate (MMA) in the presence of LDHs intercalated by organic anions (dodecyl sulfate, laurate, stearate). There are few studies in the open literature on the mechanical and thermal properties of PMMA nanocomposites reinforced with hydrophobic HDLs and so far it was not found in open literature studies about the mechanical and thermal properties of the PMMA nanocomposites reinforced with stearate intercalated LDHs. In our laboratory, the investigation in the nanocomposites area started recently, however, some results on the nanocomposites of polystyrene and layered double hydroxides have already been produced. In the present work were synthesized nanocomposites with high transparence in the visible region as well as nanocomposites with an uniform orange color, without the addition of dyes or pigments. By thermogravimetric analysis, the results showed that the addition of LDHs may increase PMMA decomposition temperature in more than 80°C. The results of dynamic mechanical analysis, for nanocomposites with 1wt% of LDHs, showed that elastic modulus more than 2 times higher than PMMA in the range of studied temperature. In order to verify how the LDH concentration could affect the previously evaluated properties, nanocomposites containing six different pre-selected LDHs, in two different concentrations (3% and 5%) were synthesized. These results demonstrated that most of these nanocomposites presented microhardness values higher than those found for PMMA Doutorado Desenvolvimento de Processos Químicos Doutor em Engenharia Química
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- 2021
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10. In situ synthesis, morphology, and thermal properties of polystyrene--MgAl layered double hydroxide nanocomposites
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Botan, Rodrigo, Nogueira, Telma Regina, Wypych, Fernando, and Lona, Liliane Maria Ferrareso
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Magnesium alloys -- Usage -- Composition ,Aluminum alloys -- Usage -- Composition ,Polystyrene -- Usage ,Chemical synthesis -- Methods ,Polymeric composites -- Mechanical properties -- Thermal properties -- Composition -- Production processes -- Identification and classification ,Aluminum-magnesium alloys -- Usage -- Composition ,Engineering and manufacturing industries ,Science and technology - Abstract
Polystyrene (PS)/layered double hydroxide (LDH) nanocomposites were synthesized by in situ free radical bulk polymerization. LDH formed by magnesium and aluminum (Mg:Al--molar ratio of 2:1) was prepared by coprecipitation method and intercalated with sodium dodecyl sulfate (DDS). The nanocomposites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and flammability test. The XRD and TEM demonstrated that synthesized nanocomposites in all compositions studied showed a high global dispersion of LDH in PS, suggesting exfoliation. The results of TGAs (when 50% mass loss was selected as a comparison point) and flammability tests for synthesized nanocomposites, presented a significant improvement in thermal stability and flammability property when compared with pure PS. This behavior and properties indicate application of the surfactant intercalated LDH reinforced PS in fields where thermal stability is an important characteristic. POLYM. ENG. SCI., 52:1754-1760, 2012. © 2012 Society of Plastics Engineers, INTRODUCTION According to the International Union of Pure and Applied Chemistry (IUPAC), polymer nanocomposites can be defined as the combination of a polymer continuous phase (matrix) and other materials (reinforcements) [...]
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- 2012
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11. Analytical Assessment and Nutritional Adequacy of School Lunches in Sintra’s Public Primary Schools
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Nogueira, Telma, primary, Ferreira, Raquel J., additional, Dias da Silva, Vitória, additional, Liñan Pinto, Mariana, additional, Damas, Carlos, additional, and Sousa, Joana, additional
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- 2021
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12. Development of RisObIn.Com, a Screening Tool for Risk of Childhood Obesity in the Community
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Moreira, Ana Catarina, primary, Almeida Oliveira, Patrícia, additional, Borrego, Rute, additional, Nogueira, Telma, additional, Ferreira, Raquel, additional, and Virella, Daniel, additional
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- 2020
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13. Layered double hydroxides as fillers in poly(l-lactide) nanocomposites, obtained by in situ bulk polymerization
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Nogueira, Telma, primary, Gonçalves, Núria, additional, Botan, Rodrigo, additional, Wypych, Fernando, additional, and Lona, Liliane, additional
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- 2016
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14. Extracção de óleo de Jatropha Curcas L. em meio aquoso com recurso a enzimas
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Nogueira, Telma Elisabete Mourão, Bezerra, Rui Manuel Furtado, and Rodrigues, Miguel António Machado
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Dissertação de Mestrado em Engenharia do Ambiente O interesse pelo biodiesel surgiu recentemente devido às expectativas de diminuição acentuada das reservas de petróleo e também devido à poluição que a exploração industrial deste recurso provoca. A produção de biodiesel é feita a partir de sementes de oleaginosas ou de gorduras animais sendo uma energia renovável e menos poluente do que as energias que derivam de recursos fósseis. A Jatropha curcas L. é uma planta promissora na produção de biodiesel uma vez que se trata de uma espécie não alimentar e que prolifera de forma vantajosa em climas tropicais. No presente estudo analisou-se a rentabilidade da extracção de óleo da semente de J. curcas, em meio aquoso com recurso a duas enzimas: uma protease (tripsina) e enzimas holocelulotíticas extraídas de Trichoderma viride (Onozuka R-10). Estas enzimas foram escolhidas com base na análise da composição química da semente de forma a seleccionar as que actuassem nos componentes presentes em maior quantidade. Os resultados revelaram que o uso destas enzimas originou rendimentos superiores aos da extracção em meio aquoso sem enzimas. No caso da tripsina os melhores resultados manifestaram-se às 6 horas de incubação conseguindo-se um incremento de 5% comparativamente ao controlo. Já no caso da Onozuka R-10 os melhores rendimentos foram obtidos às 0,5 horas conseguindo-se um incremento de 13% em relação ao controlo. Posteriormente procurou-se avaliar o possível sinergismo destas duas enzimas actuando simultaneamente. Os resultados revelaram que a tripsina e a Onozuka R-10 em conjunto incrementaram o rendimento em 10% quando comparado com o uso isolado de cada uma delas e 15% em comparação com o controlo. O efeito das enzimas sobre as percentagens de ácidos gordos do óleo também foi estudado neste trabalho. As conclusões deste estudo revelaram que o óleo extraído em meio aquoso é composto principalmente pelos ácidos: palmítico, oleico, esteárico e linoleico e as percentagens em que estes ácidos se encontram nos óleos não varia significativamente com o processo de extracção enzimática. Recently, the interest in biodiesel has emerged due to expectations that oil stocks will end up and also because of the pollution that this the industrial utilization of this resource causes. The biodiesel production is made from oil seeds or animal fats being renewable and less polluting than the energies that are derived from fossil resources. Jatropha curcas L. is a promising plant for biodiesel since it is a non-food species and proliferates in tropical climates. In the present work the profitability of the oil extraction of J. curcas seed in water using two enzymes: a protease (trypsin) and holocellulolytic enzymes extraction from Trichoderma viride (Onozuka R-10) was analysed. These enzymes were chosen based on the analysis of the chemical composition of the seed, aiming to select those enzymes that could have an effect on the components present in higher concentrations. The results showed that the use of these enzymes lead to higher yields of oil extraction. For the trypsin enzymatic treatment the best results were obtained at 6 hours of incubation, achieving a 5% increment compared with the control. For the enzyme treatment with Onozuka´s R-10 the best yields were obtained at 0.5 hours, achieving a growth of 13% compared with control. We also tried to evaluate the possible synergism of these two enzymes acting simultaneously. The results showed that trypsin and Onozuka R-10 together boosted the performance by 10% compared with the separate use of each and by 15% compared with the control. The effect of enzymes on the percentages of fatty oils was also studied in this work. The findings of this study show that the extracted oil is composed mainly by fatty acids, palmitic, oleic, stearic and linoleic and the percentages of these fatty acids do not vary significantly with the process of enzyme extraction.
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- 2009
15. Effect of Layered Double Hydroxides on the Mechanical, Thermal, and Fire Properties of Poly(methyl methacrylate) Nanocomposites
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Nogueira, Telma, primary, Botan, Rodrigo, additional, Macedo Neto, José Costa, additional, Wypych, Fernando, additional, and Lona, Liliane, additional
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- 2012
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16. Synthesis and characterization of LDHs/PMMA nanocomposites: Effect of two different intercalated anions on the mechanical and thermal properties
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Nogueira, Telma, primary, Botan, Rodrigo, additional, Wypych, Fernando, additional, and Lona, Liliane, additional
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- 2011
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17. Study of thermal and mechanical properties of PMMA/LDHs nanocomposites obtained by in situ bulk polymerization
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Nogueira, Telma, primary, Botan, Rodrigo, additional, Wypych, Fernando, additional, and Lona, Liliane, additional
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- 2011
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18. Síntese e caracterização de Nanocompósitos Esfoliados de Poliestireno: Hidróxido Duplo Lamelar via polimerização in situ
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Botan, Rodrigo, primary, Nogueira, Telma R., additional, Lona, Liliane M. F., additional, and Wypych, Fernando, additional
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- 2011
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19. Effect of initiator type and concentration on polymerization rate and molecular weight in the bimolecular nitroxide-mediated radical polymerization of styrene
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Nogueira, Telma Regina, primary, Gonçalves, Maria Cecília, additional, Ferrareso Lona, Liliane Maria, additional, Vivaldo-Lima, Eduardo, additional, McManus, Neil, additional, and Penlidis, Alexander, additional
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- 2010
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20. Investigação experimental da copolimerização de estireno divinilbenzeno (DVB) via radical livre controlada por radicais nitroxido (NMRP)
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Regina Nogueira, Telma, primary
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21. Effect of Layered Double Hydroxides on the Mechanical, Thermal, and Fire Properties of Poly(methyl methacrylate) Nanocomposites.
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Nogueira, Telma, Botan, Rodrigo, Macedo Neto, José Costa, Wypych, Fernando, and Lona, Liliane
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The effects of preselected six different layered double hydroxides (LDHs) (Zn/Al 4:1 DDS, Mg/Al 2:1 DDS, Zn/Al 2:1 stearate, Mg/Fe 4:1 stearate, Zn/Al 2:1 laurate, and Mg/Fe 4:1 laurate) on the mechanical, thermal, and fire properties of poly(methyl methacrylate) (PMMA) nanocomposites, synthesized by intercalative in situ bulk polymerization, were evaluated. PMMA nanocomposites containing three different LDH concentrations (1, 3, and 5 wt%) were produced, and it was observed that all the nanocomposites with lower LDH concentration (1 wt%) showed a higher elastic modulus than PMMA. However, as the LDH concentration increased, the elastic modulus decreased for all the nanocomposites. It was shown that PMMA/(Zn/Al 2:1 stearate) containing 5 wt% of LDH in its composition exhibited a decomposition temperature about 97°C higher than pure PMMA. According to this study, it was found that it is possible to enhance some mechanical and thermal properties of PMMA using very low LDH concentrations (mass fraction of LDH equal to 1%). LDHs are inexpensive materials based on abundant metals with a simple synthesis method that has a low environmental impact. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E660-E674, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21309 [ABSTRACT FROM AUTHOR]
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- 2013
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22. Synthesis and characterization of LDHs/PMMA nanocomposites: Effect of two different intercalated anions on the mechanical and thermal properties.
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Nogueira, Telma, Botan, Rodrigo, Wypych, Fernando, and Lona, Liliane
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NANOCOMPOSITE materials ,MECHANICAL behavior of materials ,POLYMERS ,POLYMERIZATION ,THERMAL analysis ,PLASTICS - Abstract
Poly(methyl methacrylate) (PMMA)/layered double hydroxides (LDH) nanocomposites were synthesized by in situ bulk polymerization. The LDHs were synthesized by coprecipitation method. Eight LDHs having different compositions were produced, varying the divalent/trivalent cations (Zn/Al, Mg/Fe), the ratio between these cations (2: 1 and 4: 1) and the LDH intercalated anions (dodecyl sulfate and laurate). The LDH percentage (wt %) in the PMMA was fixed at 1%. The thermal properties of the nanocomposites were evaluated by thermal analysis (thermogravimetric-TGA and differential scanning calorimetry-DSC). Most of the nanocomposites presented higher thermal resistance than PMMA and the best results were presented by the following nanocomposites: PMMA/(Zn/Al 2: 1 laurate) and PMMA/(Zn/Al 4: 1 laurate). The dynamic mechanical properties of the nanocomposites were investigated and compared to those obtained for PMMA. It was noticed that PMMA/(Mg/Fe 4: 1 laurate) nanocomposite presented an elastic modulus 2.2 times higher than PMMA at 40°C. This investigation demonstrated that the addition of low concentrations of selected LDHs can enhance some desired properties of PMMA. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 [ABSTRACT FROM AUTHOR]
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- 2012
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23. O papel da posição socioeconómica na prevenção da obesidade infantil: dados Sintra Cresce Saudável
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Silva, Vitória Alves Ferreira Dias da, Goes, Ana Rita, and Nogueira, Telma
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Obesidade infantil ,Socio-economic status ,Community interventions ,Childhood obesity ,Intervenção comunitária ,Pprevention ,Ciências Sociais::Outras Ciências Sociais [Domínio/Área Científica] ,Prevenção ,Desigualdades em saúde ,Health inequalities ,Posição socioeconómica - Abstract
RESUMO - Introdução: Prevenir a obesidade em todas as crianças, independentemente da posição que ocupam na hierarquia social, é uma prioridade do século XXI. A evidência sobre a posição socioeconómica nos resultados das intervenções para a prevenção da obesidade é inconsistente. O objetivo deste estudo é determinar o papel da posição socioeconómica no efeito da intervenção Sintra Cresce Saudável no estado nutricional das crianças. Materiais e Métodos: Estudo não randomizado do tipo “antes e depois”. Participaram 1343 crianças do 1º ciclo do ensino básico do município de Sintra (grupos de intervenção e controlo). Aferiu-se indicadores da posição socioeconómica por questionário enviado aos encarregados de educação, observou-se o consumo de lanches em contexto escolar e mediram-se dados antropométricos das crianças. Resultados: No início do ano letivo, 39% das crianças apresentava excesso de peso e 62% aporte energético ao lanche da manhã excessivo. A variação do índice de massa corporal e do aporte energético ao lanche da manhã, entre início e fim do ano, não é independente entre grupos de intervenção e controlo (p=0,034 e p=0,009). Considerando o aporte energético ao lanche da manhã, a razão de chances de obter variação no sentido promotor de saúde, neste período, foi de 1,49 nas crianças intervencionadas cujas mães apresentavam habilitações literárias inferiores (IC 95% 0,41-5,35). Discussão e Conclusão: Verifica-se possível efeito benéfico da intervenção nas crianças com posição socioeconómica inferior, embora sejam necessários mais estudos. Reforça-se a necessidade de implementar e avaliar intervenções multicomponentes, multissectoriais, abrangentes e sustentadas no tempo para reduzir as iniquidades no combate à obesidade infantil. ABSTRACT - Introduction: Preventing obesity in all children, regardless of socioeconomic status, is a 21st-century priority. Evidence on the socioeconomic status of outcomes of obesity prevention interventions is inconsistent. The aim of the study is to determine the influence of socioeconomic status on the effect of the Sintra Cresce Saudável intervention on children's nutritional status. Methods and materials: Non-randomized “before and after” study. 1343 children from primary schools in the municipality of Sintra participated (intervention and control groups). Indicators of socioeconomic position were measured using a questionnaire sent to parents, the intake of snacks in the school context was observed and children's anthropometric data were measured. Results: At the beginning of the school year, 39% of the children were overweight and 62% had excessive energy consumption in the morning snack. The variation in body mass index and energy consumption at morning snacks, during the school year, is not independent between intervention and control groups (p=0.034 and p=0.009). Considering the energy intake in the morning snack, the odds ratio of obtaining variation in the health-promoting sense was 1,49 for intervened children whose mothers had lower education (IC 95% 0,41-5,35). Discussion and Conclusion: There is a possible beneficial effect of the intervention on children with lower socioeconomic positions, although more studies are needed. We reinforce the need to implement and evaluate multicomponent, multisectoral, comprehensive and sustainable over-time interventions to reduce inequities in childhood obesity.
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- 2023
24. Synthesis and characterization of poly(l-lactide-co-epsilon-caprolactone)/layered double hydroxide nanocomposites
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Núria Ângelo Gonçalves, Lona, Liliane Maria Ferrareso, 1966, Nogueira, Telma Regina, Souza, Elizabeth Fatima de, Parizotto, Natália, Mei, Lúcia Helena Innocentini, Schiavon, Maria Ingrid Rocha Barbosa, Universidade Estadual de Campinas. Faculdade de Engenharia Química, Programa de Pós-Graduação em Engenharia Química, and UNIVERSIDADE ESTADUAL DE CAMPINAS
- Subjects
Copolímeros ,Polymeric nanocomposites ,Hidróxidos duplos lamelares ,Copolymers ,Layered double hydroxide ,PLLA ,Nanocompósitos poliméricos - Abstract
Orientadores: Liliane Maria Ferrareso Lona, Telma Regina Nogueira Caio Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química Resumo: A presente pesquisa teve por objetivo sintetizar nanocompósitos poliméricos com matriz de poli (L-lactídeo-co-?-caprolactona) reforçados com hidróxidos duplos lamelares, visando obter novos materiais com melhor estabilidade térmica e flexibilidade quando comparados ao poli (L-lactídeo). Foram sintetizados quatro tipos de hidróxidos duplos lamelares pelo método de coprecipitação a pH constante, utilizando dois pares de cátions divalente/trivalente (Ca/Al e Ca/Fe) e dois agentes intercalantes (ácido sebácico e láurico). Os nanocompósitos foram sintetizados pelo método da polimerização intercalativa in situ em massa por abertura do anel. A fração mássica entre os monômeros L-lactídeo/?-caprolactona utilizada foi de 80/20 e cada hidróxido duplo lamelar foi utilizado em quatro diferentes frações mássicas (0,5, 1, 2 e 3 %). Os materiais obtidos foram caracterizados pelas técnicas de difração de raios X, espectroscopia no infravermelho por transformada de Fourier, análise termogravimétrica, calorimetria exploratória diferencial, ensaio de flexão e teste de permeabilidade ao vapor de água. A síntese dos hidróxidos duplos lamelares foi confirmada pelos resultados das análises de difração de raios X, espectroscopia no infravermelho por transformada de Fourier e análise termogravimétrica. Observou-se que todos os hidróxidos duplos lamelares apresentaram espaçamento basal condizente com a intercalação dos ânions e estrutura característica de materiais lamelares. A partir da análise de TGA foi possível observar que os nanocompósitos começaram a se degradar em temperaturas até 40º C mais altas que o poli (L-lactídeo). Nos testes de flexão realizados, observou-se que os nanocompósitos apresentaram uma deformação sob flexão até 1692% maior que o valor apresentado para o poli (L-lactídeo). Por fim, na análise de permeabilidade ao vapor de água, o nanocompósito PLLCL/CaAl-L (1%) apresentou um valor de taxa de permeabilidade ao vapor de água classificado como moderado Abstract: This project aimed to synthesize polymeric nanocomposites containing poly (L-lactide-co-?-caprolactone) as matrix and reinforced with layered double hydroxides. Four types of layered double hydroxides have been synthesized by co-precipitation method at constant pH. In this synthesis two pairs of divalent/trivalent cations (calcium/aluminum and calcium/iron) and two intercalating agents (sebacate and laurate anions) have been evaluated. The nanocomposites were synthesized by in situ intercalative ring-opening polymerization, in bulk. The weight ratio between the L-lactide/?-caprolactone monomers was 80:20. Four different weight fractions of the layered double hydroxides (0,5, 1, 2 and 3 wt%) have been evaluated. The nanocomposites obtained were characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, differential scanning calorimetry, flexure test and water vapor permeability test. Layered double hydroxide synthesis was confirmed by X-ray diffraction, FTIR and thermogravimetric analysis. It was observed that all the nanocomposites presented a basal spacing consistent with the anions intercalation. From the thermogravimetric results, it was possible to observe that the nanocomposites started to degrade at temperatures up to 40° C higher than poly (L-lactide). Flexure tests demonstrated that the nanocomposites exhibited a strain 1692% higher than the value found for poly (L-lactide). Finally, by the analysis of the water vapor permeability, the PLLCL/CaAl-L (1%) nanocomposite showed a water vapor permeability rate value that can be classified as moderate Doutorado Desenvolvimento de Processos Químicos Doutora em Engenharia Química CNPQ 141426/2012-8
- Published
- 2015
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