Estudo da biodegradação de hidrocarbonetos por bactérias provindas de mar profundo

• Ano de defesa: 2017
• Autor(a) principal: Souza, Cindi Espada de [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo
• Palavras-chave em Português: Expedition; Oil seeps; Hexadecane; Emulsifiers; GC-MS; Expedição; Hexadecano; Emulsificantes; CG-EM
• Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=5111885; http://repositorio.unifesp.br/handle/11600/50031

Oil seeps are locations with gas and oil infiltration occurring above ground or offshore structures (deep sea). Offshore exploration of these environments has been limited, due to their in situ sampling and observation difficulties. The advent of submarines and remotely operated vehicles (ROVs), recently, allowed the investigation of biological communities related to different physiological processes in oil seeps. In this context, the present work had the privilege to obtain samples for this environment, from developed expeditions at the Atlantic ocean region, known as São Paulo Plateau. It was possible to have 162 isolates of bacteria, those were submitted to fast screenings to verify abilities to survive using hexadecane as sole carbon source. It was also possible to select strains able to produce metabolites with emulsifying activity under automotive motor oil. The hydrocarbon biodegradation ability was evaluated by chromatographic analysis (GC-MS). In this context, three (3) isolates (Csh 01, Csh 26 and Csh 28A) were selected, showing hydrocarbon biodegradation indexes above to 50 %. Phylogenetically, these bacteria were affiliated to the genus Bacillus sp., closely related to Bacillus cereus species. Two (2) isolates (Csh 31 and Csh 32B) were selected about their emulsifying abilities, above to 50 %. The isolated Csh31 was characterized as Klebsiella oxytoca, while Csh 32B was identified as Bacillus pumilus.