Elisabete Valério

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Domestication of plants and animals promoted humanity's transition from nomadic to sedentary lifestyles, demographic expansion, and the emergence of civilizations. In contrast to the well-documented successes of crop and livestock breeding, processes of microbe domestication remain obscure, despite the importance of microbes to the production of food,(More)
In order to assess the potential of several molecular targets for the identification, typing and traceability of cyanobacteria in freshwater reservoirs, molecular techniques were applied to 118 cyanobacterial isolates mostly sourced from Portuguese freshwater reservoirs and representative of three orders of cyanobacteria: Chroococcales (54), Oscillatoriales(More)
Transport of glucose and fructose in the yeast Saccharomyces cerevisiae plays a crucial role in controlling the rate of wine fermentation. In S. cerevisiae, hexoses are transported by facilitated diffusion via hexose carriers (Hxt), which prefer glucose to fructose. However, utilization of fructose by wine yeast is critically important at the end of(More)
So far, the presence of microcystins in Portuguese freshwater resources has always been attributed to the bloom-forming cyanobacteria Microcystis aeruginosa. In 2005, however, microcystins were detected at the Beliche reservoir (Algarve, South Portugal), following the development of a bloom dominated by Planktothrix rubescens. The identity of the causative(More)
The genus Saccharomyces currently includes eight species in addition to the model yeast Saccharomyces cerevisiae, most of which can be consistently isolated from tree bark and soil. We recently found sympatric pairs of Saccharomyces species, composed of one cryotolerant and one thermotolerant species in oak bark samples of various geographic origins. In(More)
The Estela Sousa e Silva Algal Culture Collection (ESSACC) is the legacy of nearly 40 years of the National Institute of Health Dr. Ricardo Jorge (INSA) scientific and public activity in marine and freshwater phytoplankton biology and toxicology. The living isolates maintained in the ESSACC are mostly represented by marine dinoflagellates and freshwater(More)
Here, we investigate a group of red to pinkish ballistoconidia-forming yeasts that were preliminarily identified as Sporobolomyces roseus or Sporidiobolus pararoseus. Detailed molecular and micromorphological studies revealed that the sexual strains and several conspecific anamorphic isolates belonged to a novel teleomorph that represents the sexual stage(More)
Cyanobacteria are a diverse well adapted group of organisms that presents amazing morphological diversity. Cyanobacteria can be unicellular or colonial (filamentous, spherical or amorphous) (Fig. 1). Since cyanobacteria have cells larger than normal bacterial cells and behavior more similar to algae, they were classified under the microalgae for a long time(More)
The relationship between Sporidiobolus johnsonii and S. salmonicolor was investigated using rDNA sequence data. Two statistically well-supported clades were obtained. One clade included the type strain of S. johnsonii and the other included the type strain of S. salmonicolor. However, some mating strains of S. salmonicolor were found in the S. johnsonii(More)
This report presents the description of a new Sporobolomyces species, Sp. odoratus sp. nov. The new species was characterized by DNA fingerprinting using the micro/minisatellite-primed PCR approach (MSP-PCR). A phylogenetic analysis using the D1/D2 region of the 26S rDNA revealed that Sp. odoratus belongs to a clade that includes Rhodosporidium fluviale and(More)