Barbosa Jr. A.M.,Federal University of Minas Gerais |
Barbosa Jr. A.M.,Laboratorio Of Microbiologia Aplicada Lma |
De Oliveira Santos B.F.,Federal University of Sao Paulo |
De Oliveira Carvalho E.,Cardiology |
And 4 more authors.
Jornal Brasileiro de Patologia e Medicina Laboratorial
Introduction: Cryptococcus neoformans and Cryptococcus gattii are encapsulated basidiomycetous yeasts with worldwide distribution. They cause cryptococcosis with features of systemic infection, affecting the central nervous system, lungs and skin in humans and animals. These fungi present numerous virulence factors that allow them to invade the host and multiply, among which extracellular enzyme capacity and microbial adaptation to different temperatures are worth mentioning. Objective: To evaluate the production of protease and investigate possible differences in thermotolerance and urease activity in clinical and environmental yeast isolates. Material and methods: Culture methods and Pz analysis were applied to assess urease and protease, whereas the optical density method was used to analyze biological activity in thermotolerance. Results: There was no significant results as to microbial growth at the tested temperatures (25°, 37° and 42°C). It was observed that clinical specimens grew better than environmental ones at elevated temperatures. As to C. neoformans, the moderate production of urease enzyme prevailed in both clinical and environmental isolates within 24h or 48h. Moreover, there was significant production on the seventh day of reading. The best reading time for viewing protease production in both isolates and species was the seventh day: 96% clinical samples and 94% environmental isolates. Conclusion: Further studies are required in order to investigate the virulence factors of C. neoformans and C. gattii cerebrospinal isolates from patients with meningoencephalitis and environmental samples from Sergipe. Furthermore, a higher technical accuracy and statistical precision are indispensable. Source
Pascon R.C.,Federal University of Sao Paulo |
Pascon R.C.,Applied Microbiology Laboratory |
Bergamo R.F.,Federal University of Sao Paulo |
Bergamo R.F.,Applied Microbiology Laboratory |
And 10 more authors.
Composting is a way of transforming the organic waste into fertilizer, minimizing the use of inorganic compounds that may contaminate the environment. This transformation is the result of the microorganism action, converting complex carbon sources into energy. Enzymes that are exported by the microorganisms to the surrounding environment mediate this process. The aiming of the present work is to prospect the compost produced by the organic composting unit (OCU) of the Fundação Parque Zoológico de São Paulo (FPZSP) to find novel starch hydrolyzing organisms (SHO) that secrete large amounts of amylases under harsh conditions, such as high temperature. We found five bacterial isolates that have amylolytic activity induced by soluble starch and 39°C temperature of growth. These bacterial strains were identified by MALDI-TOF (Matrix-assisted laser desorption/ ionization-Time of Flight) analysis, a rapid and efficient methodology for microbe identification in large scale. Our results present amylolytic strains that belong to diverse taxonomic groups (Solibacillus silvestris, Arthrobacter arilaitensis, Isoptericola variabilis, and Acinetobacter calcoaceticus); some of them have never been associated with this kind of hydrolytic activity before. The information regarding enzyme induction will be important to optimize the production by the bacterial isolates, which may be a great value for biotechnological applications. © 2011 Renata C. Pascon et al. Source