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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2011.tde-13092011-140905
Document
Author
Full name
Bárbara Pereira da Silva
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Garboggini, Fabiana Fantinatti (President)
Destefano, Suzete Aparecida Lanza
Sircili, Marcelo Palma
Title in Portuguese
Identificação de bactérias isoladas de elementos metálicos de torres de transmissão de energia elétrica e avaliação de resistência à metais pesados.
Keywords in Portuguese
Biorremediação
Corrosão dos materiais
Energia elétrica
Metais pesados
Resistência dos materiais
RNA ribossômico
Abstract in Portuguese
A corrosão metálica é um problema que afeta a economia mundial, sendo responsável pelo aumento dos custos de geração, transmissão e distribuição de energia elétrica e pode ser influenciada por atividades microbianas, podendo levar a aceleração ou inibição do processo. O presente trabalho teve por objetivo isolar e identificar as bactérias associadas a processos de corrosão em torres de transmissão de energia, bem como avaliar a resistência destas bactérias a diferentes metais pesados buscando selecionar micro-organismos com potencial para biorremediação. A identificação taxonômica dos isolados associados a elementos metálicos foi efetuada por análise filogenética das sequências parciais do gene RNA ribossomal 16S, resultando em 101 bactérias distribuídas em oito gêneros: Lysinibacillus, Serratia, Stenotrophomonas, Pseudomonas, Exiguobacterium, Chryseobacterium, Bacillus e Acinetobacter. Todos os gêneros foram resistentes a mais de um metal, sendo que o metal que menos afetou o crescimento dos isolados foi o cromo e o que mais afetou foi o mercúrio.
Title in English
Identification of bacteria isolated from metallic elements of electric energy transmission towers and evaluation of heavy metal resistance.
Keywords in English
Bioremediation
Corrosion of materials
Electric power
Heavy metals
Ribosomal RNA
Strength of materials
Abstract in English
Metallic corrosion is a problem that affects the world economy, being responsible for the increased costs of generating, transmission and distribution of electricity and can be influenced by microbial activities, leading to inhibition or acceleration of the process. This study aimed to isolate and identify bacteria associated with corrosion processes in metallic structures of power transmission towers, as well as evaluating the resistance of these bacteria to different heavy metals, in order to select microorganisms with potential for biorremediation. The taxonomic identification of the isolates of bacteria associated with metallic elements was performed by phylogenetic analysis of partial sequences of 16S ribosomal RNA gene, resulting in 101 bacteria distributed in eight genera: Lysinibacillus, Serratia, Stenotrophomonas, Pseudomonas, Exiguobacterium, Chryseobacterium, Bacillus and Acinetobacter. All genera were resistant to more than one metal. Chromium and mercury were the metals that least and most affected the growth of isolates, respectively.
 
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Publishing Date
2011-09-22
 
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