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| Procópio,Rudi Emerson de Lima; Silva,Ingrid Reis da; Martins,Mayra Kassawara; Azevedo,João Lúcio de; Araújo,Janete Magali de. |
| Streptomyces is a genus of Gram-positive bacteria that grows in various environments, and its shape resembles filamentous fungi. The morphological differentiation of Streptomyces involves the formation of a layer of hyphae that can differentiate into a chain of spores. The most interesting property of Streptomyces is the ability to produce bioactive secondary metabolites, such as antifungals, antivirals, antitumorals, anti-hypertensives, immunosuppressants, and especially antibiotics. The production of most antibiotics is species specific, and these secondary metabolites are important for Streptomyces species in order to compete with other microorganisms that come in contact, even within the same genre. Despite the success of the discovery of antibiotics,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Streptomyces; Antibiotics; Resistance; Infection. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702012000500011 |
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| Mendonça,Analucia Longman; Mariano,Rosa de Lima Ramos; Araújo,Janete Magali de; Cavalcante,Uided Maaze T.. |
| Forty-four Bacillus spp. strains obtained from sugar cane derivates and residues, six of them isolated in this work, were tested using Tween 80 as substrate (agar-Tween 80 medium), in order to determine their esterase activity through the enzymatic index averages. After statistic analysis, B. cereus (C124) strain, which presented better results, was submitted to genetic improvement by treatment with ultraviolet light (UV). The survival curve pointed out 28" as the time necessary to obtain 30% of survivors. Fifty survivors and the wild strain C124 were compared in relation to their esterase activity as mentioned previously. The wild strain and the mutant C124UV35, which showed enzymatic index average higher than C124, were characterized in polyacrilamide... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacteria; Genetic improvement; Bacillus spp.; B. cereus; Esterase. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100011 |
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