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The role of carbon and nitrogen ratio on sewage sludge microbiota for producing polyhydroxyalkanoates.
J Environ Manage
January 2025
Engineering Department, University of Palermo, Viale delle Scienze, Ed. 8, 90128, Palermo, Italy.
The products of an advanced sewage sludge fermentation process can be used to generate polyhydroxyalkanoates (PHAs), precursors of bioplastics considered excellent candidates for replacing petroleum-derived plastics. The aerobic feast-anoxic famine cycling strategy has proven to be an efficient method for enriching sewage sludge microbiota with PHA-producing microorganisms. This work evaluated the effect of different carbon to nitrogen ratios (C/N) of 3.
View Article and Find Full Text PDFA Dive Into Yeast's Sugar Diet-Comparing the Metabolic Response of Glucose, Fructose, Sucrose, and Maltose Under Dynamic Feast/Famine Conditions.
Biotechnol Bioeng
January 2025
Department of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Delft, The Netherlands.
Microbes experience dynamic conditions in natural habitats as well as in engineered environments, such as large-scale bioreactors, which exhibit increased mixing times and inhomogeneities. While single perturbations have been studied for several organisms and substrates, the impact of recurring short-term perturbations remains largely unknown. In this study, we investigated the response of Saccharomyces cerevisiae to repetitive gradients of four different sugars: glucose, fructose, sucrose, and maltose.
View Article and Find Full Text PDFSystematic analysis of the glucose-PTS in highlighted its importance in central metabolism and bacterial fitness.
Appl Environ Microbiol
January 2025
Department of Oral Biology, University of Florida College of Dentistry, Gainesville, Florida, USA.
Article Synopsis
- A single-nucleotide polymorphism in the ManN gene led to unusual traits in glucose phosphotransferase system (PTS) mutants, including increased organic acid excretion and heightened PTS activity, affecting bacterial fitness and carbon catabolite repression.* -
- Genetic deletions of different PTS components resulted in growth defects on glucose due to excessive hydrogen peroxide (HO) excretion, but these defects were mitigated with catalase supplementation, ultimately enhancing bacterial yield.* -
- The study suggests that the glucose-PTS plays a crucial role in regulating central carbon metabolism in streptococci, influencing acid production, pH balance, and the bacterial antagonism against harmful oral species, pointing to its potential as a therapeutic target for dys
SloR-SRE binding to the promoter is cooperative.
bioRxiv
November 2024
Program in Molecular Biology & Biochemistry, Department of Biology, Middlebury College, Middlebury, Vermont, USA.
is a commensal member of the plaque microbiome. It is especially prevalent when dietary sugars are available for fermentation, generating acid byproducts that lower plaque pH and foster tooth decay. can survive in the transient conditions of the mouth, in part because it can regulate the uptake of manganese and iron during periods of feast when metal ions are available, and famine when they are limiting.
View Article and Find Full Text PDFAssessing the aerobic/anoxic enrichment efficiency at different C/N ratios: polyhydroxyalkanoate production from waste activated sludge.
Water Res
January 2025
Engineering Department, Palermo University, Viale delle Scienze ed. 8, Palermo 90128, Italy. Electronic address:
Polyhydroxyalkanoates (PHA) can be produced using fermentation products of an excess sewage sludge fermentation process. An efficient method to enrich a PHA-producing community is an aerobic-feast/anoxic-famine enrichment strategy. The effect of different carbon to nitrogen (C/N) feed ratios of 1, 2 and 3.
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