Role of chemical concentration and second carbon sources in acclimation of microbial communities for biodegradation.
AUTOR(ES)
Wiggins, B A
RESUMO
A study was conducted to determine the role of concentration of the test chemical, of a second organic compound, and of mutation in the acclimation period before the mineralization of organic compounds in sewage. The acclimation period for the mineralization in sewage of 2 micrograms of 4-nitrophenol (PNP) per liter increased from 6 to 12 days in the presence of 10 mg of 2,4-dinitrophenol per liter. The extension of the acclimation period was equivalent to the time required for mineralization of 2,4-dinitrophenol. In contrast, the time for acclimation for the degradation of 2 micrograms of PNP per liter was reduced when 10 or 100 mg of phenol per liter was added. Lower phenol levels increased the acclimation period to 8 days. The length of the acclimation period for PNP mineralization decreased as the initial concentration of PNP increased from 2 micrograms to 100 mg/liter. The acclimation period for phenol mineralization was lengthened as the phenol concentration increased from 100 to 1,400 mg/liter. The length of the acclimation period for PNP and phenol biodegradation was reproducible, but it varied among replicates for the biodegradation of other nitro-substituted compounds added to sewage or lake water, suggesting that a mutation was responsible for acclimation to these other compounds. The acclimation period may thus reflect the time required for the destruction of toxins, and it also may be affected by the concentration of the test compound or the presence of other substrates.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=204376Documentos Relacionados
- Alternative nonlinear model for estimating second-order rate coefficients for biodegradation.
- Microbial growth on hydrocarbons: terminal branching inhibits biodegradation.
- Effect of Concentration of Organic Chemicals on Their Biodegradation by Natural Microbial Communities
- Stimulation of Mn peroxidase activity: a possible role for oxalate in lignin biodegradation.
- Metabolic efficiency and turnover of soil microbial communities in biodegradation tests.