Francisco A. R. Barbosa

Edmar Chartone-Souza6
Andréa M. A. Nascimento6
Mariana P. Reis6
6Edmar Chartone-Souza
6Andréa M. A. Nascimento
6Mariana P. Reis
3Marcelo P. Ávila
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Mining negatively affects the environment by producing large quantities of metallic tailings, such as those contaminated with arsenic, with harmful consequences for human and aquatic life. A culture-independent molecular analysis was performed to assess the prokaryotic diversity and community structural changes of the tropical historically(More)
  • Patrícia S. Costa, Larissa L. S. Scholte, Mariana P. Reis, Anderson V. Chaves, Pollyanna L. Oliveira, Luiza B. Itabayana +4 others
  • 2014
The bacterial community and genes involved in geobiocycling of arsenic (As) from sediment impacted by long-term gold mining were characterized through culture-based analysis of As-transforming bacteria and metagenomic studies of the arsC, arrA, and aioA genes. Sediment was collected from the historically gold mining impacted Mina stream, located in one of(More)
Among the neutrophilic iron-oxidizing bacteria (FeOB), Gallionella is one of the most abundant genera in freshwater environments. By applying qPCR and DGGE based on 16S rRNA gene-directed primers targeting Gallionellaceae, we delineated the composition and abundance of the Gallionellaceae-related FeOB community in streams differentially affected by metal(More)
Yeast communities were assessed in 14 rivers and four lakes from the Doce River basin in Brazil, during the rainy and dry seasons of the years 2000 and 2001. Water samples were collected at the subsurface in all sites. The following physical and chemical parameters were measured: temperature, dissolved oxygen, pH, electrical conductivity, total phosphorus,(More)
The phylogenetic diversity of freshwater bacteria, particularly in tropical lakes, has not been thoroughly investigated. Here, we employed a cloning- and sequencing-based analysis of the 16S rRNA gene to investigate the composition of bacterial communities from the upper (UW, 0 m depth) and bottom (BW, 7 m depth) waters of a tropical unstratified freshwater(More)
Ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) are a diverse and functionally important group in the nitrogen cycle. Nevertheless, AOA and AOB communities driving this process remain uncharacterized in tropical freshwater sediment. Here, the effect of human settlement on the AOA and AOB diversity and abundance have been assessed by(More)
Cyanobacteria proliferation represents a problem to water treatment for human consumption supply. Species of the genus Microcystis, commonly found in continental waters, can bloom and produce microcystine and other toxic compounds associated to human and animal poisoning, depending on the nutrient levels present in the water. The use of natural products to(More)
This paper describes BDiG-PELD, a digital library for integrating ecological data produced by a Brazilian biodiversity research network. The BDiG-PELD architecture uses open interoperability standards and decentralized input interfaces for handling heterogeneous data from non-structured sources. These data are published in local EML (Ecological Metadata(More)
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