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Production of extracellular lipase by the phytopathogenic fungus Fusarium solani FS1 Rev. Microbiol.
Maia,Maria de Mascena Diniz; Morais,Marcia Maria Camargo de; Morais Jr.,Marcos Antonio de; Melo,Eduardo Henrique Magalhães; Lima Filho,José Luiz de.
A Brazilian strain of Fusarium solani was tested for extracellular lipase production in peptone-olive oil medium. The fungus produced 10,500 U.l-1 of lipase after 72 hours of cultivation at 25oC in shake-flask at 120 rpm in a medium containing 3% (w/v) peptone plus 0.5% (v/v) olive oil. Glucose (1% w/v) was found to inhibit the inductive effect of olive oil. Peptone concentrations below 3% (w/v) resulted in a reduced lipase production while increased olive oil concentration (above 0.5%) did not further stimulate lipase production. The optimum lipase activity was achieved at pH 8.6 and 30oC and a good enzyme stability (80% activity retention) was observed at pH ranging from 7.6 to 8.6, and the activity rapidly dropped at temperatures above 50oC. Lipase...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Enzyme kinetics; Ester hydrolysis; Extracellular lipase; Fusarium solani.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000400003
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Biofilm production by clinical isolates of Pseudomonas aeruginosa and structural changes in LasR protein of isolates non biofilm-producing BJID
Lima,Jailton Lobo da Costa; Alves,Lilian Rodrigues; Jacomé,Paula Regina Luna de Araújo; Bezerra Neto,João Pacífico; Maciel,Maria Amélia Vieira; Morais,Marcia Maria Camargo de.
ABSTRACT Introduction: Biofilm production is an important mechanism for the survival of Pseudomonas aeruginosa and its relationship with antimicrobial resistance represents a challenge for patient therapeutics. P. aeruginosa is an opportunistic pathogen frequently associated to nosocomial infections, especially in imunocompromised hosts. Objectives: Analyze the phenotypic biofilm production in P. aeruginosa isolates, describe clonal profiles, and analyze quorum sensing (QS) genes and the occurrence of mutations in the LasR protein of non-biofilm producing isolates. Methods: Isolates were tested for biofilm production by measuring cells adherence to the microtiter plates. Clonal profile analysis was carried out through ERIC-PCR, QS genes were by specific...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pseudomonas aeruginosa; Biofilm; Multiresistance; Quorum sensing (QS).
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702018000200129
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Immobilization of lipase from Fusarium solani FS1 BJM
Knight,Kirsty; Pimentel,Maria do Carmo Barros; Morais,Marcia Maria Camargo de; Ledingham,William M.; Lima Filho,José Luiz de; Maia,Maria de Mascena Diniz.
Lipase from Fusarium solani FS1 was immobilized by covalent attachment to polyacrylamide beads and onto magnetized Dacron, retaining 12% and 97% of activity, respectively. Lipase was also entrapped within polyacrylamide beads, retaining 53% of activity. Investigations of the kinetic characteristics of the immobilized derivatives using triolein as substrate showed that lipase immobilized onto polyacrilamide beads and Dacron did not follow Michaelis-Menten kinetics.
Tipo: Info:eu-repo/semantics/other Palavras-chave: Fusarium solani FS1; Immobilized lipase; Enzyme kinetics; Dacron; Polyacrylamide beads.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000300013
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