Consulta: creatorFacets:"Melo,Vânia Maria Maciel"
Registros recuperados: 4
Data/hora: 01/06/2024 16:29:31

Crude glycerol from biodiesel industry as substrate for biosurfactant production by Bacillus subtilis ATCC 6633
Provedor de dados: 52
Autores: Sousa,Marylane de; Dantas,Iuri Torquato; Felix,Anne Kamilly Nogueira; Sant'Ana,Hosiberto Batista de; Melo,Vânia Maria Maciel; Gonçalves,Luciana Rocha Barros.
Glycerol, a co-product of the biodiesel industry, may be a suitable raw material for the production of high added-value compounds by the microorganisms. This study aimed to use the glycerol obtained from the biodiesel production process as the main carbon source for biosurfactant production by Bacillus subtilis ATCC 6633. Results indicated that the strain lowered the surface tension of the cell-free fermented broth to 31.5 ± 1.6 mN/m, indicating the production of biosurfactant. The critical micelle concentration (CMC = 33.6 mN/m) obtained was similar to the previously reported for biossurfactants isolated from other Bacillus. The produced biosurfactant was able to emulsify n-hexadecane and soybean oil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosurfactant; Biodiesel; Glycerol and Surfactin.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000200019

Effect of proteins from the red seaweed Hypnea musciformis (Wulfen) Lamouroux on the growth of human pathogen yeasts
Provedor de dados: 52
Autores: Cordeiro,Rossana Aguiar; Gomes,Valdirene Moreira; Carvalho,Ana Fontenele Urano; Melo,Vânia Maria Maciel.
A protein fraction, rich in lectin, obtained from the red seaweed Hypnea musciformis by precipitation with ammonium sulfate (F40/70) was screened for chitinase and beta-1,3-glucanase activity and assessed for antifungal potential against the human pathogen yeasts Candida albicans and C. guilliermondii. The F40/70 fraction showed chitinase and beta-1,3-glucanase enzymes, with specific activities of 276.43 and 1880.7 Units.mg -1 protein, respectively. It was capable of inhibiting the growth of C. guilliermondii at the concentrations of 45, 100 and 450 µg protein.ml -1 but it showed only a discrete inhibition against C. albicans irrespective of the tested concentrations. The inhibitory action was shown to be fungistatic and the presence of the glycoprotein...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypnea musciformis antifungal activity beta-1; 3-glucanase chitinase lectin.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700008

Antimicrobial effect of a crude sulfated polysaccharide from the red seaweed Gracilaria ornata
Provedor de dados: 52
Autores: Amorim,Rodrigo das Neves dos Santos; Rodrigues,José Ariévilo Gurgel; Holanda,Márjory Lima; Quinderé,Ana Luíza Gomes; Paula,Regina Célia Monteiro de; Melo,Vânia Maria Maciel; Benevides,Norma Maria Barros.
The aim of this study was to determine the yield, chemical composition, specific rotation (SR), infrared (IR) spectroscopy and the effect on bacterial growth of a crude sulfated polysaccharide (SP) from the red marine alga G. ornata (Go). Go-1 (25°C), Go-2 (80°C), and Go-3 (80°C) were sequentially extracted and yielded 9.2%. The contents of sulfate (5.88-10.3%) and proteins (0.1-3.7%) were small. The values of SR were [µ]D20°f -19.0, -51.0, and -56.5, respectively. IR spectrums showed the presence of galactose-4 sulfate and absence of 3,6-anydrogalactose-2 sulfate, galactose-6 sulfate and galactose-2 sulfate. SR and IR techniques confirmed SPs. Go-3 was tested on the growth of bacteria (Bacillus subtilis, Staphylococcus aureus, Enterobacter aerogens,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Sulfated macromolecules; Chemical analysis; Antimicrobial.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000200001

Interaction of antimicrobial peptide Plantaricin149a and four analogs with lipid bilayers and bacterial membranes
Provedor de dados: 58
Autores: Lopes,José Luiz de Souza; Hissa,Denise Cavalcante; Melo,Vânia Maria Maciel; Beltramini,Leila Maria.
The amidated analog of Plantaricin149, an antimicrobial peptide from Lactobacillus plantarum NRIC 149, directly interacts with negatively charged liposomes and bacterial membranes, leading to their lysis. In this study, four Pln149-analogs were synthesized with different hydrophobic groups at their N-terminus with the goal of evaluating the effect of the modifications at this region in the peptide's antimicrobial properties. The interaction of these peptides with membrane models, surface activity, their hemolytic effect on red blood cells, and antibacterial activity against microorganisms were evaluated. The analogs presented similar action of Plantaricin149a; three of them with no hemolytic effect (&lt; 5%) until 0.5 mM, in addition to the induction of a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimicrobial activity antimicrobial peptide calcein leakage; Hemolytic assay.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000400038