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Evaluating heterotrophic growth in a nitrifying biofilm reactor using fluoresce...
Nogueira, R.; Elenter, D.; Brito, A. G.; Melo, L. F.; Wagner, Michael; Morgenroth, E.The objective of this study was to evaluate the significance of heterotrophic growth in nitrifying biofilm reactors fed only with ammonium as an energy source. The diversity, abundance and spatial distribution of nitrifying bacteria were studied using a combination of molecular tools and mathematical modeling, in two biofilm reactors operated with different hydraulic retention times. The composition and distrib...
Evaluating heterotrophic growth in a nitrifying biofilm reactor using fluoresce...
Nogueira, R.; Elenter, D.; Brito, A. G.; Melo, L. F.; Wagner, Michael; Morgenroth, E.The objective of this study was to evaluate the significance of heterotrophic growth in nitrifying biofilm reactors fed only with ammonium as an energy source. The diversity, abundance and spatial distribution of nitrifying bacteria were studied using a combination of molecular tools and mathematical modeling, in two biofilm reactors operated with different hydraulic retention times. The composition and distrib...
Study of nitrifying bacteria diversity on biofilms using a molecular approach
Nogueira, R.; Purkhold, Ulrike; Melo, L. F.; Wagner, MichaelThe purpose of this work was to investigate the microbial community structure of nitrifying biofilms. Biofilm samples were collected from two reactors operated with distinct retention times. The composition and spatial distribution of nitrifying consortia in biofilms was quantified by fluorescence in situ hybridization (FISH) with rRNA-targeted oligonucleotide probes combined with confocal laser scanning micros...
Nitrifying and heterotrophic population dynamics in biofilm reactors : effects ...
Nogueira, R.; Melo, L. F.; Purkhold, Ulrike; Wuertz, Stefan; Wagner, MichaelTwo biofilmreactors operated with hydraulic retention times of 0.8 and 5.0 h were used to study the links between population dynamics and reactor operation performance during a shift in process operation from pure nitrification to combined nitrification and organic carbon removal. The ammonium and the organic carbon loads were identical for both reactors. The composition and dynamics of the microbial consortia ...
Microbial community composition and function in wastewater treatment plants
Wagner, Michael; Loy, Alexander; Nogueira, R.; Purkhold, Ulrike; Lee, Natuschka; Daims, HolgerBiological wastewater treatment has been applied for more than a century to ameliorate anthropogenic damage to the environment. But only during the last decade the use of molecular tools allowed to accurately determine the composition, and dynamics of activated sludge and biofilm microbial communities. Novel, in many cases yet not cultured bacteria were identified to be responsible for filamentous bulking and f...
Tratamento das afecções da aorta com a primeira geração de stents auto-expansíveis
PEREIRA,Wagner Michael; LOBO,Roberto; SALES,Marcela; TANAKA,Nicásio; PORTUGAL,Luís Enrique V.; FLORES,Luís Antônio V.; KUHNEN,Élcio R.INTRODUÇÃO: O emprego de stents auto-expansíveis no tratamento das afecções da aorta descendente apresenta-se como uma nova alternativa, e o objetivo deste trabalho é avaliar o seu desempenho. CASUÍSTICA E MÉTODOS: No período de abril de 1998 a novembro de 2000 (32 meses), foram operados 144 pacientes com doenças da aorta, sendo 66 (45,83%) dissecções, 50 (34,72%) aneurismas e 28 (19,44%) outros procedimentos c...
Microbial population dynamics versus nitrification performance in biofilm react...
Nogueira, R.; Purkhold, Ulrike; Wuertz, Stefan; Melo, L. F.; Wagner, Michaelln order to improve biological reactors operation and design it is important to study the effects of changes in process parameters with regard to the microbial community structure and, vice versa, the effects of community structure and dynamics on the reactors performance. Two biofilm reactors operated with hydraulic retention times of 1 h and 6 h were used to study the links between population dynamics and rea...
"Stent" auto-expansível nas dissecções da aorta tipo B
PEREIRA,Wagner Michael; FROTA FILHO,José Dario; SALES,Marcela; DELATORRE,Nilton; LEÃES,Paulo E.; BLACHER,Celso; LÚCIO,Eraldo; PEREIRA,Patrícia Q.O tratamento clínico das dissecções agudas da aorta do tipo B tem mortalidade em torno de 25% menor que a mortalidade cirúrgica. O tratamento cirúrgico das dissecções crônicas também produz uma morbidade e mortalidade elevadas. A utilização de "stents"auto-expansíveis endovasculares pode ser uma nova alternativa no tratamento destas lesões. De abril a dezembro de 1998 foram implantados 15 "stents" endovasculare...
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