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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

Produção e caracterização de proteases de fungos isolados de amostras de solo da região Amazônica

Azevedo, Tailah Oliveira Marins, 92988112100 31 January 2018 (has links)
Submitted by Taiwany Oliveira (taiwanyrodriguess@gmail.com) on 2018-10-22T13:12:07Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação Tailah ufam.pdf: 1125670 bytes, checksum: 4ba5214107ea1f1e2b9c2fdac7cba3ad (MD5) / Approved for entry into archive by Marcos Roberto Gomes (mrobertosg@gmail.com) on 2018-10-22T15:26:38Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação Tailah ufam.pdf: 1125670 bytes, checksum: 4ba5214107ea1f1e2b9c2fdac7cba3ad (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2018-10-23T13:53:38Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação Tailah ufam.pdf: 1125670 bytes, checksum: 4ba5214107ea1f1e2b9c2fdac7cba3ad (MD5) / Made available in DSpace on 2018-10-23T13:53:38Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação Tailah ufam.pdf: 1125670 bytes, checksum: 4ba5214107ea1f1e2b9c2fdac7cba3ad (MD5) Previous issue date: 2018-01-31 / FAPEAM - Fundação de Amparo à Pesquisa do Estado do Amazonas / Proteases are the group of hydrolytic enzymes of major industrial interest, enzymes that cleave peptide bonds in proteins, promoting the hydrolysis of the chains. It has a wide commercial and industrial use and can be obtained from a variety of sources, the fungicides having advantages over others, and can be obtained in large quantities, in a standardized way and without causing environmental damages. The proteases of interest to the cosmetic industry can be produced on an industrial scale by means of bioprocesses using microorganisms. The production of proteases is little explored in Amazonian fungi, however these soil isolates present activities that can contribute to the development and expansion of regional products. In this context the objective of this work was to evaluate the production and to characterize partially proteases of fungi isolated from soil samples from the Amazon region. In an initial screening were performed bioprocesses with enzyme inducing medium, which had its enzymatic quantification performed after 72h of fermentation in orbital agitation. The enzymatic activity was determined by the reaction of the substrate azocaseine with the enzymatic broth and paralyzed with trichloroacetic acid. The fungi that stood out most in the initial screening were identified morphologically and coded as Fusarium INPA 6 and Aspergillus INPA 154, presenting activities of 97 and 54 IU / mL, respectively. Bioprocesses were performed to analyze the influence of the variables on the enzymatic production. This optimization showed that the factors present in the bioprocess influence the activity of the protease, and the fungi of this study achieved better results in the presence of gelatine and yeast extract as carbon sources and nitrogen respectively in a shaking at 120 rpm with the cell concentration / ml at 104 and initial pH of the medium in the range of 6. Having provided a protease with optimum pH in the range of 8 and optimum temperature at 50 ° C. These results indicate that the bioprocess with Amazonian fungi is an interesting possibility in the research of new sources of proteases, with a strong sustainable and economic appeal. The region now has two new sources of proteases with characteristics interesting to the cosmetics industry. In a more technological academic aspect, these new sources of proteases have the potential to be evaluated as more efficient and / or economical sources. / Proteases são o grupo de enzimas hidrolíticas de maior interesse industrial, são enzimas que clivam ligações peptídicas nas proteínas, promovendo a hidrólise das cadeias. Têm ampla utilização comercial e industrial e podem ser obtidas de variadas fontes, tendo as de origem fúngica vantagens frente às outras, podendo ser obtidas em grandes quantidades, de forma padronizada e sem causar danos ambientais. As proteases de interesse da indústria cosmética podem ser produzidas em escala industrial por meio de bioprocessos utilizando micro-organismos. A produção de proteases é pouco explorada em fungos amazônicos, no entanto esses isolados de solo apresentam atividades que podem contribuir para o desenvolvimento e expansão de produtos regionais. Nesse contexto, o objetivo deste trabalho foi avaliar a produção e caracterizar parcialmente proteases de fungos isolados de amostras do solo da região amazônica. Em uma triagem inicial, foram realizados bioprocessos com meio indutor de enzimas, que teve sua quantificação enzimática realizada após 72h de fermentação em agitação orbital. A atividade enzimática foi determinada pela reação do substrato azocaseína com o caldo enzimático e paralisada com ácido tricloroacético. Os fungos que mais se destacaram na triagem inicial foram identificados morfologicamente e codificados como Fusarium INPA 6 e Aspergillus INPA 154, apresentando atividades de 97 e 54 UI/mL, respectivamente. Realizaram-se bioprocessos para analisar a influência das variáveis na produção enzimática, essa otimização demonstrou que os fatores presentes no bioprocesso exercem influência na atividade da protease, tendo os fungos deste estudo alcançado melhores resultados na presença de gelatina e extrato de levedura como fontes de carbono e nitrogênio, respectivamente, em uma agitação a 120 rpm, com a concentração de células/mL a 104 e pH inicial do meio na faixa de 6. Tendo proporcionado uma protease com pH ótimo na faixa de 8 e temperatura ótima a 50 ºC. Estes resultados indicam que o bioprocesso com fungos amazônicos é uma interessante possibilidade na pesquisa de novas fontes de proteases, com um forte apelo sustentável e econômico. A região passa a contar com duas novas fontes de proteases com características interessantes para a indústria de cosméticos. Em um aspecto mais acadêmico tecnológico, essas novas fontes de proteases possuem potencial para serem avaliadas como fontes mais eficientes e/ou econômicas.
2

Factores que influyen en la compra en el canal digital en tiendas por departamento / Factors influencing the purchase in the digital channel in retail

Latoure Rojas, Ariana Elizabeth, Rasmussen Saavedra, Karen Camila 25 August 2020 (has links)
El propósito del presente trabajo tiene como finalidad analizar los factores que influyen en la compra en el canal digital en tiendas por departamento, en los cuales se resaltaron y se usaron como base cuatro grandes factores expuestos por Martin Lewicki, los cuales son: la arquitectura, la oferta, la información y la comunidad. Estos factores, serán detallados más adelante con el fin de poder identificar cuáles son los que generan mayor influencia en los usuarios de este medio. Asimismo, poder conocer las relaciones que guardan entre los mismos y ver en cuáles las compañías debería ponerle más énfasis para poder generar mayor cantidad de rotación de productos y así generar ganancias. / The purpose of this work is to analyze the factors that influence purchases in the digital channel by department, in which four major factors were highlighted and used as a basis by Martin Lewicki, which are: architecture, supply , information and the community. These factors will be detailed later in order to be able to identify the greatest ones that generate the greatest influence on users of this medium. Likewise, knowing the relationships between them and looking at companies in search engines should put more emphasis on it to generate a greater amount of product rotation and thus generate profits. / Trabajo de investigación

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