Marcelo Gomes Marçal Vieira Vaz

ORCID: 0000-0003-1624-8281
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About
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Research Areas
  • Algal biology and biofuel production
  • Aquatic Ecosystems and Phytoplankton Dynamics
  • Microbial Community Ecology and Physiology
  • Biocrusts and Microbial Ecology
  • Photosynthetic Processes and Mechanisms
  • Marine and coastal ecosystems
  • Geochemistry and Elemental Analysis
  • Heavy metals in environment
  • Arsenic contamination and mitigation
  • Microbial Metabolic Engineering and Bioproduction
  • Marine Sponges and Natural Products
  • Biodiesel Production and Applications
  • Plant Diversity and Evolution
  • Diatoms and Algae Research
  • Biofuel production and bioconversion
  • Enzyme Production and Characterization
  • Education and Digital Technologies
  • Chromium effects and bioremediation
  • Water Quality Monitoring and Analysis
  • Marine Biology and Ecology Research
  • Plant-Microbe Interactions and Immunity
  • Microbial Natural Products and Biosynthesis
  • Protist diversity and phylogeny
  • Freshwater macroinvertebrate diversity and ecology
  • Physiological and biochemical adaptations

University of Liège
2023-2024

Universidade Federal de Viçosa
2014-2024

Universidade de São Paulo
2012-2020

Methodist University of Piracicaba
2012

The genus Leptolyngbya Anagnostidis & Komárek (1988) was described from a set of strains identified as ‘LPP-group B’. morphology within this group is not particularly informative and underestimates the group’s genetic diversity. In present study, two new pseudanabaenacean genera related to morphotypes, Pantanalinema gen. nov. Alkalinema nov., are under provisions International Code Nomenclature for Algae, Fungi Plants, based on polyphasic approach. (type species rosaneae sp. nov.) has...

10.1099/ijs.0.070110-0 article EN INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 2014-10-29

Nostoc is a common and well-studied genus of cyanobacteria and, according to molecular phylogeny, polyphyletic group. Therefore, revisions this are urged in an attempt clarify its taxonomy. Novel strains isolated from underexplored environments assigned morphologically the not genetically related ‘true ’ In study, four biofilms collected Antarctica five originated Brazilian mangroves were evaluated. Despite their morphological similarities other morphotypes , these nine differed ecological,...

10.1099/ijs.0.070078-0 article EN INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 2014-11-26

Cyanobacteria is a remarkable group of prokaryotic photosynthetic microorganisms, with several genera capable fixing atmospheric nitrogen (N2) and presenting wide range morphologies. Although the nitrogenase complex not present in all cyanobacterial taxa, it spread across strains. The has also high theoretical potential for biofuel production, since H2 by-product produced during N2 fixation. In this review we discuss significance relatively variety cell morphologies metabolic strategies that...

10.1590/1678-4685-gmb-2016-0050 article EN cc-by Genetics and Molecular Biology 2017-03-20

Saline-alkaline lakes are extreme environments that limit the establishment and development of life. The Nhecolândia, a subregion Pantanal wetland in Brazil, is characterized by existence ~500 saline-alkaline lakes, which support an underexplored rich diversity microorganisms. In this study, unicellular homocytous cyanobacteria from five were accessed culture-dependent approaches. Morphological evaluation analyses near complete sequences (~1400 nt) 16S rRNA genes applied for phylogenetic...

10.1111/jpy.12192 article EN Journal of Phycology 2014-04-19

The genus Scenedesmus harbors around 120 species, and some strains have been successfully used for mass culture biotechnological applications. Considering the potential of this as a promising feedstock production biofuels, mainly biodiesel, it was evaluated combined effects trace elements, salinity stress different cultivation modes (single batch, semi-continuous, two-stage batch) on lipid productivity freshwater S. obliquus BR003 bajacalifornicus BR024. Cultivation BR024 applying medium...

10.1016/j.biortech.2019.121644 article EN publisher-specific-oa Bioresource Technology 2019-06-12

<title>Abstract</title> Clonal plants, like <italic>Salvinia auriculata</italic>, are widespread and perform important ecosystem functions, influencing the structure composition of ecosystems in which they occur. Some cyanobacteria biological nitrogen fixation (BNF) can affect plant growth, as (N) is a limiting nutrient. Therefore, we carried out greenhouse experiment with inoculation cyanobacterial strain <italic>Desmonostoc</italic> (UFLA 12) to investigate whether heterocystous favour...

10.21203/rs.3.rs-5822876/v1 preprint EN cc-by Research Square (Research Square) 2025-01-17

Cyanobacteria are an important source of structurally bioactive metabolites, with cytotoxic, antiviral, anticancer, antimitotic, antimicrobial, specific enzyme inhibition and immunosuppressive activities. This study focused on the antitumor antimicrobial activities intra extracellular cyanobacterial extracts. A total 411 strains were screened for activity using a subset pathogenic bacteria as target. The in vitro assays performed extracts 24 tested against two murine cancer cell lines (colon...

10.2174/1389201014666131227114846 article EN Current Pharmaceutical Biotechnology 2014-01-31

Cyanobacteria is an ancient phylum of oxygenic photosynthetic microorganisms found in almost all environments Earth. In recent years, the taxonomic placement some cyanobacterial strains, including those belonging to genus Nostocsensu lato, have been reevaluated by means a polyphasic approach. Thus, 16S rRNA gene phylogeny and 16S-23S internal transcribed spacer (ITS) secondary structures coupled with morphological, ecological physiological data are considered powerful tools for better...

10.1099/ijsem.0.002878 article EN INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 2018-07-09

ABSTRACT Due to the emergence of large microalgae farms and increased competition in this sector, search for higher productivity is common. One way achieve goal production optimize factors that influence their growth during cultivation stage increase accumulation bio-compounds interest. In stage, most are: nutrition, gas diffusion, light intensity quality and, finally, stirring, which directly affects all other factors. Thus, a review an evaluation importance stirring were performed present...

10.1590/1807-1929/agriambi.v24n2p134-139 article EN cc-by Revista Brasileira de Engenharia Agrícola e Ambiental 2019-12-20
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