Papers by Josiane Oliveira
Brazilian Journal of Microbiology, 2004
A total of 285 samples of meat and meat products were evaluated for the presence of bacteriocin-p... more A total of 285 samples of meat and meat products were evaluated for the presence of bacteriocin-producing lactic acid bacteria by the "sandwich" test. From 174 of these samples, 813 strains of lactic acid bacteria were isolated. They were able to inhibit the growth of Staphylococcus aureus CTC 33 and/or Listeria innocua Lin 11. When evaluated by the well-diffusion assay, 128 of these strains inhibited the growth of the indicator strains. The inhibitory spectra of activity of the isolates were evaluated against a range of Gram-positive and Gram-negative test organisms. S. aureus was the most sensitive indicator tested, whereas Enterococcus faecalis and Lactobacillus plantarum were the most resistant ones. All the compounds produced by the lactic acid bacteria were fully or partially inactivated by some of the proteolytic enzymes, which indicates their proteinaceous nature. The antimicrobial activity of the bacteriocins produced by the lactic acid bacteria isolated in this work could act as a potential barrier to inhibit the growth of spoilage bacteria and foodborne pathogens.
Brazilian Journal of Microbiology, 2004
A total of 285 samples of meat and meat products were evaluated for the presence of bacteriocin-p... more A total of 285 samples of meat and meat products were evaluated for the presence of bacteriocin-producing lactic acid bacteria by the "sandwich" test. From 174 of these samples, 813 strains of lactic acid bacteria were isolated. They were able to inhibit the growth of Staphylococcus aureus CTC 33 and/or Listeria innocua Lin 11. When evaluated by the well-diffusion assay, 128 of these strains inhibited the growth of the indicator strains. The inhibitory spectra of activity of the isolates were evaluated against a range of Gram-positive and Gram-negative test organisms. S. aureus was the most sensitive indicator tested, whereas Enterococcus faecalis and Lactobacillus plantarum were the most resistant ones. All the compounds produced by the lactic acid bacteria were fully or partially inactivated by some of the proteolytic enzymes, which indicates their proteinaceous nature. The antimicrobial activity of the bacteriocins produced by the lactic acid bacteria isolated in this work could act as a potential barrier to inhibit the growth of spoilage bacteria and foodborne pathogens.
The iron ore market is a highly lucrative business within world's scenario. Vale Corporation has ... more The iron ore market is a highly lucrative business within world's scenario. Vale Corporation has a strong influence in this market, exporting around 200 millions iron ore tons per year. The company invests millions in infrastructure, technology and operations optimization that result on a large scale production. This paper shows the shipment operations practiced in one unit of this company in Brazil and a study about it. The process of iron ore shipment is strategic for Vale, and it involves several restrictions within navigation area that presents a direct impact on company's results. This paper focus on decision processes analysis between two strategies: the first one, to continue with the current operational shipment strategy; the second one, to adopt another already used which presents some navigability restrictions and could affect the company operational and financial results.
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Papers by Josiane Oliveira