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Master's Dissertation
DOI
https://doi.org/10.11606/D.87.2017.tde-17012017-103739
Document
Author
Full name
Camila de Moura Pereira dos Santos
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Takagi, Mickie (President)
Ramos, Rosemeire Cobo Zanella
Silva, Luiziana Ferreira da
Title in Portuguese
Estudo dos diferentes aceptores de elétrons nos cultivos de Haemophilus influenzae tipo b em anaerobiose.
Keywords in Portuguese
Haemophilus influenzae b
Aceptor de elétron
Anaerobiose
DMSO
Fumarato
Metabolismo
Abstract in Portuguese
Haemophilus influenzae (Hi) é uma bactéria Gram negativa dependente dos fatores de crescimento NAD e hemina. O sorotipo b (Hib) é causador de doenças invasivas de importância clínica. É uma bactéria anaeróbia facultativa, e se adapta em devido à versatilidade do seu arsenal metabólico e assim, sendo capaz de causar infecção em nichos com e sem oxigênio no hospedeiro. O objetivo deste trabalho foi estudar o comportamento cinético de Hib em anaerobiose, aerobiose e a interface entre as duas condições, utilizando diferentes aceptores de elétrons (fumarato, DMSO, nitrato e oxigênio). Nitrato possui o maior potencial de redução padrão, porém o nitrito gerado de sua oxidação inviabilizou o crescimento de Hib. DMSO apresentou o melhor crescimento celular em frascos agitados, frente a fumarato de sódio. Ensaios em biorreator demonstraram que em anaerobiose, com fumarato de sódio como aceptor, succinato é o metabólito principal formado. Acetato foi produzido com todos os aceptores testados, seja em anaerobiose ou aerobiose, majoritário na última condição. Lactato de sódio e glicerol foram totalmente consumidas em aerobiose e lentamente em anaerobiose, sem esgotar nenhuma das fontes de carbono.
Title in English
Study of different electron acceptor for Haemophilus influenzae type b in anaerobic cultivation.
Keywords in English
Haemophilus influenzae b
Anaerobiosis
DMSO
Electron acceptor
Fumarate
Metabolism
Abstract in English
Haemophilus influenzae (Hi) is a Gram-negative bacterium and require growth factors for its development (hemin and NAD). Serotype b (Hib) is an important human pathogen for public health. It is a facultative anaerobic bacterium, which is allowed to adapt in several host niches due to its metabolic versatility with oxygen or its absence. The aim of this work is to study the growth kinetic of Hibs in anaerobiosis and aerobiosis, in the presence of different final electron acceptors (fumarate, DMSO, nitrate and oxygen). Nitrate has the major reduction potential among the electron acceptors tested, however Hib did not growth. In the presence of DMSO, Hib has the better growth. Anaerobic essay carried out in bioreactor showed that in the presence of fumarate as electron acceptor, succinate was the major metabolite produced. Acetate was produced in the presence of all electron acceptors tested, in both conditions (anaerobiosis and aerobiosis. Lactate and glycerol were entirely consumed in aerobiosis as carbon source and in anaerobiosis, the consumption of both carbon sources were not expressive.
 
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Publishing Date
2017-01-17
 
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