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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Nanopart?culas de magnetita com oxacilina obtida por moagem de alta energia para aplica??es biom?dicas

Carvalho, Juliana Fernandes de 26 February 2013 (has links)
Made available in DSpace on 2014-12-17T14:16:32Z (GMT). No. of bitstreams: 1 JulianaFC_DISSERT.pdf: 2465662 bytes, checksum: 2528260c5aedc6b5fb63748e3692e16a (MD5) Previous issue date: 2013-02-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The drug targeting has been the subject of extensive studies in order to develop site-specific treatments that minimize side effects and become more effective anticancer therapy. Despite considerable interest in this class, drugs like antibiotics also have limitations, and have been neglected. Using new pharmaceutical technologies, the use of magnetic vectors appear as promising candidate for drug delivery systems in several studies. Small magnetic particles bound to the drug of interest can be modulated according to the orientation of a magnet outside the body, locating and holding in a specific site. In this work, we propose the use of High Energy Milling (HEM) for synthesis of a magnetic vector with characteristics suitable for biomedical applications by intravenous administration, and for the formation of an oxacillin-carrier complex to obtain a system for treating infections caused by Staphylococcus aureus. The results of the variation of milling time showed that the size and structural properties of the formed material change with increasing milling time, and in 60 hours we found the sample closest to the ideal conditions of the material. The vector-drug system was studied in terms of structural stability and antimicrobial activity after the milling process, which revealed the integrity of the oxacillin molecule and its bactericidal action on cultures of Staphylococcus aureus ATCC / A vetoriza??o de f?rmaco tem sido alvo de exaustivos trabalhos no intuito de desenvolver tratamentos s?tio-espec?ficos que minimizem efeitos adversos e torne mais efetiva a terapia antineopl?sica. Apesar do grande interesse nessa classe, f?rmacos como os antibi?ticos tamb?m apresentam limita??es, e t?m sido negligenciados. Utilizando novas tecnologias farmac?uticas, o emprego de vetores magn?ticos aparece como candidato promissor para sistemas de entrega de f?rmaco em in?meros estudos. As pequenas part?culas magn?ticas ligadas ao f?rmaco de interesse podem ser moduladas de acordo com a orienta??o de um ?m? externo ao corpo, localizado e retendo o ativo no local de interesse. Nesse trabalho n?s propomos a utiliza??o de Moagem de Alta Energia (MAE) para s?ntese do vetor magn?tico com caracter?sticas apropriadas para aplica??es biom?dicas por via de administra??o intravenosa, e para complexa??o do carreador ? Oxacilina para obten??o de um sistema para tratamento de infec??es por Staphylococcus aures. Os resultados da varia??o do tempo de moagem demonstraram que as propriedades estruturais e de tamanho do material formado se alteram com o aumento do tempo de moagem, e dentre os per?odos estudados, 60 horas foi escolhido como o mais pr?ximo das propriedades ideais do material. A complexa??o vetor-f?rmaco foi estudada em termos de estabilidade estrutural e de atividade antimicrobiana ap?s o processo de moagem, que revelaram a integridade da mol?cula de Oxacilina e de sua a??o bactericida sobre culturas de Staphylococcus aures ATCC
2

Degrada??o fotoqu?mica de efluentes industriais contendo polipropileno e isoniazida

Telemaco, Emmanuelle de Paiva 01 April 2008 (has links)
Made available in DSpace on 2014-12-17T15:01:46Z (GMT). No. of bitstreams: 1 EmmanuellePT.pdf: 3267738 bytes, checksum: b73abc3e3cb9af6b3eb62a38dd314419 (MD5) Previous issue date: 2008-04-01 / Instituto Federal de Educa??o, Ci?ncia e Tecnologia do Rio Grande do Norte / One of the main impacts to the environment is the water pollution, where the industrial sector is one of the main sources of this problem. In order to search for a solution, the industrial sector is looking forward to new technologies to treat its wastewaters with the goal to reuse the water in the own process. In this mode, the treatment presents a reduction in its costs with the water suply. One of these technologies that are getting more and more applications is the advanced oxidative processes (AOP?s). In this work two industrial wastewaters have been studied, i.e., containing polymers and pharmacus. In the case of the wastewaters with polymers the UV/H2O2 process has been applied with a systematic series of experiments, using irradiation from a mercury lamp and also solar. The following variables of the UV/H2O2 process for the polymers wastewaters have been studied systematically with the lamp reactor: mode of addition of hydrogen peroxide, temperature, time of reaction, hydrogen peroxide concentration and power of the lamp (80, 125, 250 and 400W). The results demonstrated to be satisfactory, obtaining rates of organic charge removal of 100% in 120 minutes of reaction. The studied variables for the experiments with solar irradiation using polymers wastewaters were only the time of reaction, the mode of addition and concentration of the hydrogen peroxide. The results with the solar irradiation demonstrated to be not satisfactory, reaching maximum of 22% of TOC removal in 240 minutes of reaction. This is in accordance with the fact that the solar source has only 5% of low UV irradiation. With respect to the photodegradation of the pharmacus wastewaters, the process UV/H2O2 and photo-Fenton have been applied. As a source of photons, in this case, a mercury UV lamp of 80 W has been used. The studied variables for the experiments with artificial irradiation with the pharmacus wastewaters were: initial concentration of the pollutant, concentration of Fe2+ and time of reaction. The results demonstrated a degree of degradation fairly satisfactory, showing a maximum conversion value of 46% in 120 minutes / Um dos principais impactos causados ao meio ambiente ? o da polui??o das ?guas, sendo o setor industrial um dos maiores causadores deste problema. Para tentar encontrar uma solu??o, este setor est? buscando novas tecnologias para tratar seus efluentes, com o intuito de reutiliz?-los na pr?pria industria, pois, desse modo, al?m do tratamento h? uma diminui??o dos custos com a necessidade de abastecimento de ?gua. Assim, uma das tecnologias para o tratamento de efluentes que vem crescendo a cada dia s?o processos oxidativos avan?ados (POA's). Nesse trabalho, dois efluentes industriais foram estudados, contendo pol?meros e f?rmacos. No caso dos efluentes contendo pol?meros, foi utilizado processo UV/H2O2 com uma s?rie sistem?tica de experimentos usando radia??o artificial e solar. Na degrada??o dos efluentes contendo f?rmacos foram realizados experimentos utilizando radia??o artificial com os processos foto-fenton e UV/H2O2. As seguintes vari?veis do processo UV/H2O2 para os efluentes contendo pol?meros foram estudadas em um reator de pancadas com radia??o artificial: modo de adi??o do per?xido de hidrog?nio, temperatura, tempo de rea??o, concentra??o do per?xido de hidrog?nio e pot?ncia de l?mpada. Os resultados demonstraram ser satisfat?rios, obtendo taxas de remo??o de carga org?nica de 100% em 120 minutos de rea??o. As vari?veis nos experimentos utilizando o processo UV/H2O2 com radia??o solar e efluentes contendo pol?meros, foram mais restritas, pois somente variaram o modo de adi??o e a concentra??o do per?xido de hidrog?nio e o tempo de rea??o. Os resultados com a varia??o solar n?o se mostraram satisfat?rios alcan?ando no m?ximo 22% de remo??o de TOC (Carbono Org?nico Total) em 240 minutos de tempo de rea??o. Este resultado est? de acordo com o fato de que apenas 5% da radia??o solar apresentam baixo comprimento de onda UV. No estudo de degrada??o dos efluentes contendo f?rmacos, os experimentos foram realizados em reator de pancada com radia??o artificial e os processos aplicados foram por UV/H2O2 e o foto-fenton. Neste caso, as vari?veis estudadas foram: a concentra??o inicial dos f?rmacos, concentra??o dos ?ons de ferro (II) e o tempo de rea??o. Os resultados obtidos alcan?aram um grau pouco satisfat?rio, tendo um valor m?ximo de 46% de convers?o em 120 minutos de rea??o.

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