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| Castro,Gabriela Fernandes Pepe da Silva de; Rizzo,Roberta Ferreira; Passos,Thaís Souza; Santos,Beatriz Nascimento Corrêa dos; Dias,Daiana da Silva; Domingues,Josiane Roberto; Araújo,Kátia Gomes de Lima. |
| In biotechnological processes, the culture media components are responsible for high costs and exert a strong influence on the cyanobacteria behavior. The objective of this study was to evaluate the Arthrospira platensis growth potential for biomass production under different cultivation conditions using an experimental design. Three factors that are important for cyanobacteria growth were evaluated: sodium bicarbonate (9 to 18 g/l), sodium nitrate (1.25 to 2.5 g/l), and irradiance (20 to 120 µmol photons/m2.s–1). The results showed that the concentration of NaNO3 in the A. platensis medium can be reduced, resulting in increased concentrations of biomass produced. There was a higher biomass production due to the increase in the concentration of NaHCO3 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyanobacteria; Culture medium; Sodium bicarbonate; Sodium nitrate; Irradiance. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000100018 |
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| Rizzo,Roberta Ferreira; Santos,Beatriz do Nascimento Corrêia dos; Castro,Gabriela Fernandes Pepe da Silva de; Passos,Thaís Souza; Nascimento,Manuela de Abreu; Guerra,Hevelyn Dantas; Silva,Carla Guidone da; Dias,Daiana da Silva; Domingues,Josiane Roberto; Lima-Araújo,Kátia Gomes de. |
| There has been an increase in investment in research on new sources of natural pigments for food application. Some cyanobacteria can change the structures responsible for light harvesting and cellular processes according to the wavelength and light intensity. This phenomenon has been described as complementary chromatic adaptation. The present study aimed to investigate the growth of Arthrospira platensis using different light qualities, irradiance, and wavelength by evaluating the production of biomass, proteins, and phycobiliproteins. The occurrence of the chromatic adaptation phenomenon in this cyanobacterium was also investigated. The microorganism used in this study, A. platensis, was grown in a Zarrouk medium under three irradiance levels, 50, 100,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Natural pigment; Phycobiliproteins; Phycocyanin; Arthrospira platensis. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000200247 |
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| Frozi,Jesieli Braz; Domingues,Josiane Roberto; Esper,Luciana Maria Ramires; Corrêa da Rosa,Joel Maurício; Silva,Ana Luiza Sant’Anna da Costa; Gonzalez,Alice Gonçalves Martins. |
| Shiga toxin-producing Escherichia coli (STEC) O157:H7 strains (isolated by cattle’s faeces and a reference strain, EDL933), were inoculated into pasteurized milk (102 and 103 cells.mL–1) to prepare the Minas frescal cheese. As control was used uninfected milk. Physicochemical and microbiological analyses were performed to milk and elaborated cheese. The O157:H7 strains were quantified in the stages of cheese processing and during 0, 2, 4, 5, 7, 10 and 15 storage days at 8 °C onto Sorbitol MacConkey Agar supplemented with potassium tellurite and cefixime (CT-SMAC). O157:H7 was not present in the pasteurised milk prior to the artificial inoculation. At the end of the processing the cheese had 10 to 100 times more STEC O157:H7 than the initial inoculum.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cheese; Psychrotrophic bacteria; Foodborne disease. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000100108 |
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