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Percorrer por autor "Alves, M."

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  • Acção de sensibilização na Escola Secundária Alves Martins, Viseu
    Publication . Gonçalves, J. C.; Bogalheiro, M.; Melo, J.; Alves, M.; Figueiredo, A.; Veiga, N.
    2008-12-01Artigo científico Acesso aberto Ver mais
  • Microalgae-bacterial granular systems able to treat marine aquaculture water streams
    Publication . Alves, M.; Oliveira, A. T.; Castro, P. M. L.; Amorim, C. L.
    This study aimed to evaluate the granulation of microalgae-bacterial biomass and its ability to treat marine aquaculture water streams. For this, a phototrophic consortium adapted to saline conditions was enriched from water collected from a marine aquaculture facility and then used to develop the microbial aggregates. Two lab-scale photo-reactors were used: one inoculated only with the enriched phototrophic consortium and the other with the consortium and activated sludge. Rapid granulation was achieved. High ammonium and organic carbon removals of about 100% and 80%, respectively, were quickly established and maintained in the long run. This study demonstrates the rapid granulation of phototrophic biomass and its robustness and feasibility for nutrient and carbon removal from extremely low loaded water streams.
    2021-09-22Documento de conferência Acesso aberto Ver mais
  • Microbial consortia selection for the development of an innovative nature-based solution for air pollutants remediation
    Publication . Moreira, I. S.; Novo, B.; Monteiro, P.; Pinto, G.; Castro, P. M. L.; Alves, A.; Tacão, M.; Alves, M.
    Air pollutants, like benzene, toluene, and xylene (BTX), pose significant health and environmental risks being associated with 6.7 million premature deaths annually. Despite plants natural air purification capabilities in green infrastructures, high pollution levels in cities can hinder urban greening when tolerance levels are exceeded. Therefore, this study aimed to develop plant-beneficial microbial consortia with the capacity to degrade air pollutants envisioning their application as plant inoculants to promote plants’ resilience and their efficiency in air purification. Leaves and rhizosphere samples from Tilia sp., Rhododendron sp. and Euonymus sp. were collected in Porto city (Portugal), in an area with high traffic-derived air pollution (NOx, benzene – as in Qualar database). Total pigments concentration showed low variability among plants genera (from 3.24 ± 0.45 to 3.57 ± 0.30 µmol g-1). The neutral to alkaline pH of leaf extracts and high relative water content results indicated good tolerance of the sampled plant genera to pollutants. To select BTX-degrading microbial consortia, leaves and rhizosphere samples were incubated with 300ppm of BTX as the only carbon source, far exceeding EU limits. BTX concentration was monitored through GC-FID. Microbial strains within BTX degrading consortia were identified through sequencing of microbial phylogenetic markers.While leaf samples showed no BTX degradation, rhizosphere samples from all three plant genera displayed significant degradation after 7 to 14 days. Remarkably, in a Rhododendron sp. sample, only 3.8% of the initial BTX concentration remained after 14 days, indicating efficient pollutant removal. Among the fungi genera detected were Penincillium sp., Umbelopsis sp, Fusarium sp. and Clonostachys sp. with species known for their role in plant growth promotion. The obtained microbial consortia have the potential to be used as plant inoculants to promote air remediation.
    2024-05-23Documento de conferência Acesso aberto Ver mais