Consulta: subjectFacets:"Polyphosphate"
Registros recuperados: 4
Data/hora: 11/06/2024 05:22:46

Copper-induced adaptation, oxidative stress and its tolerance in Aspergillus niger UCP1261
Provedor de dados: Electronic Journal of Biotechnology
Autores: Cavalcanti Luna,Marcos A; Rodrigues Vieira,Edson; Okada,Kaoru; Campos-Takaki,Galba Maria; do Nascimento,Aline Elesbão.
Background The effects of exposure to copper, during growth, on the production of biomass, total protein, catalase, glutathione-S transferase, glutathione peroxidase, peroxidase, polyphosphate, acid and alkaline phosphatases, ultrastructure and the ability to remove this metal from Aspergillus niger, obtained from caatinga soil, were evaluated. Results All parameters tested were influenced by the concentration of metal in the culture medium. The presence of metal induced high levels of antioxidant enzymes, including lipid peroxidation, thereby revealing the appearance of an oxidative stress response. The variation in polyphosphate levels indicates the participation of the polymer in response to stress induced by copper. The activities of the phosphatases...
Tipo: Journal article
Palavras-chave: Aspergillus niger; Antioxidant enzyme; Copper removal; Polyphosphate; Ultrastructure.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600006

Copper influence on polyphosphate metabolism of Cunninghamella elegans
Provedor de dados: Brazilian Journal of Microbiology
Autores: Souza,Patrícia Mendes de; Marinho,Petrusk Homero; Lima,Marcos Antônio Barbosa de; Nascimento,Aline Elesbão do; Takaki,Galba Maria de Campos.
The aim of this work was to evaluate the physiological aspects of polyphosphate metabolism of Cunninghamella elegans grown in presence of copper. The growth profile was obtained by means of biomass yields, orthophosphate consumption, polyphosphate accumulation and phosphatases activities. The results revealed the influence of copper on the growth, observed by biomass yields. Orthophosphate consumption was faster in cells grown in the presence of copper. The presence of copper in the culture medium induced polyphosphate accumulation. The polyphosphate level was almost constant in the beginning of control culture growth, and could be related to the exponential growth phase. On the other hand, the copper treated cultures exhibited a significant reduction in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cunninghamella elegans; Copper; Polyphosphate; Phosphatases.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000400002

Polyphosphate in Zygomycetes: a cytochemical study
Provedor de dados: Brazilian Journal of Microbiology
Autores: Shari'a,Allana Elesbão do Nascimento; Nascimento,Aline Elesbão do; Lima,Marcos Antonio Barbosa de; Campos-Takaki,Galba Maria de; Souza,Wanderley de.
The inorganic phosphorus content, and distribution, structure and localization of polyphosphate in mycelia of zygomycetous fungi was evaluated. Ultrastructural cytochemistry was successfully used to identifying the localization and distribution of polyphosphate in Absidia cylindrospora, Gongronella butleri and Mucor javanicus. The results revealed differences in the cytochemical staining pattern in all species studied and a uniform labeling on the cellular surface (cell wall and citoplasmic membrane). Reaction products were observed in intracellular structures and cellular membrane. Intracellular staining was observed in trabecullar, vacuolar and vesicular structures, in dense bodies and in the cytoplasm. However, the cytochemical staining intensity varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructural cytochemistry; Polyphosphate; Zygomycetes.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000200004

Effects of phosphorus on polyphosphate accumulation by Cunninghamella elegans
Provedor de dados: Brazilian Journal of Microbiology
Autores: Lima,Marcos Antonio Barbosa de; Nascimento,Aline Elesbão do; Souza,Wanderley de; Fukushima,Kazutaka; Campos-Takaki,Galba Maria de.
The content of inorganic polyphosphate and the polymeric degree of these compounds were evaluated during the growth of Cunninghamella elegans in medium containing varying orthophosphate (Pi) concentrations. For this purpose, a combination of chemical methods for polyphosphate extraction and ultrastructural cytochemistry were used. The orthophosphate and glucose consumption was also determined during the fungal cultivation. At Pi concentrations of 0.5, 2.5 and 0.0 g/L, the maximum amounts of biomass were 3.18, 3.29 and 0.24 g/L, respectively. During growth the cells accumulated Pi from the medium. At three days of growth the biomass consumed up to 100 and 95% of Pi from the media at initial concentrations of 0.5 and 2.5 g/L, respectively. Polyphosphate was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyphosphate; Accumulation; Ultrastructural cytochemistry; Cunninghamella elegans; Ortophosfate.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000400016