156 research outputs found
Impact of microbial growth on water flow and solute transport in unsaturated porous media
Metabolism of alcaligenes denitrificans in biofilm vs planktonic cells
Aims: To compare the effect of phosphorous concentration (200 mg P 1-1 and 20 mg P 1-1) on
the denitrifying efficiency of Alcaligenes denitrificans when in the form of planktonic cells or in the form of a biofilm, and to select the most adequate C/N ratio.
Methods and Results: Two types of assays were carried out: with planktonic cells and with
cells in biofilm form. Anoxic bottles with the appropriate C/N and phosphorous concentration
were incubated at 30°C and submitted to orbital shaking at 150 rev min-1. The specific activity
of cells in biofilm form, in terms of substrate consumption, was significantly higher than cells in
planktonic form. With regard to the effect of increasing phosphorous concentration, an increase
in specific activity was also only evident when the cells were in biofilm form.
Conclusions: The two forms showed different performances and phosphorous concentration
only markedly affected the biofilm form.
Significance and Impact of the Study: The importance of the C/N/P ratio in the
denitrification process is demonstrated. As there was no report in the literature about the
stoichiometric relationship of heterotrophic denitrification with citrate, its stoichiometry,
including the requirement for cell synthesis, was determined.Instituto de Biotecnologia e QuĂmica Fina (IBQF).
PRAXIS XXI
Mineral Transformation and Biomass Accumulation Associated With Uranium Bioremediation at Rifle, Colorado
Effect of textile dyes on activity and differential regulation of laccase genes from Pleurotus ostreatus grown in submerged fermentation
Evaluation of Silicate Minerals for pH Control During Bioremediation: Application to Chlorinated Solvents
Young Adolescent’s Confidence in Maternal Support: Attentional Bias Moderates the Link Between Attachment-Related Expectations and Behavioral Problems
Effect of Extraction Variables on the Biodegradable Chelant-Assisted Removal of Toxic Metals from Artificially Contaminated European Reference Soils
The effects of Cognitive Bias Modification training and oxytocin administration on trust in maternal support: study protocol for a randomized controlled trial
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