This study characterizes the response of the microbial communities of a laboratory-scale mesophilic biogas process, fed with a synthetic substrate based on cellulose and egg albumin, to single pulses of glucose overloading (15 or 25 times the daily feed based on VS). The microbial biomass and community structure were determined from analyses of membrane phospholipids. The ratio between phospholipid fatty acids (PLFAs; eubacteria and eucaryotes) and di-ethers (PLEL; archaea) suggested that methanogens constituted 4-8% of the microbial biomass. The glucose addition resulted in transient increases in the total biomass of eubacteria while there were only small changes in community structure. The total gas production rate increased, while the relative methane content of the biogas and the alkalinity decreased. However, the biomass of methanogens was not affected by the glucose addition. The results show that the microbial communities of biogas processes can respond quickly to changes in the feeding rate. The glucose overload resulted in a transient general stimulation of degradation rates and almost a doubling of eubacterial biomass, although the biomass increase corresponded to only 7% of the glucose C added.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0960-8524(03)00075-0 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comparative analysis of antibiotic resistance genes between fresh pig manure and composted pig manure in winter, China.
PLoS One
January 2025
School of Environmental Engineering, Yellow River Conservancy Technical Institute, Kaifeng Key Laboratory of Food Composition and Quality Assessment, Kaifeng, China.
Antibiotic resistance is a critical global public health issue. The gut microbiome acts as a reservoir for numerous antibiotic resistance genes (ARGs), which influence both existing and future microbial populations within a community or ecosystem. However, the differences in ARG expression between fresh and composted feces remain poorly understood.
View Article and Find Full Text PDFCyanobacteria and Chloroflexota cooperate to structure light-responsive biofilms.
Proc Natl Acad Sci U S A
February 2025
Department of Biosphere Sciences and Engineering, Carnegie Institution for Science, Stanford, CA 94305.
Microbial mats are stratified communities often dominated by unicellular and filamentous phototrophs within an exopolymer matrix. It is challenging to quantify the dynamic responses of community members in situ as they experience steep gradients and rapid fluctuations of light. To address this, we developed a binary consortium using two representative isolates from hot spring mats: the unicellular oxygenic phototrophic cyanobacterium OS-B' (Syn OS-B') and the filamentous anoxygenic phototroph MS-CIW-1 (Chfl MS-1).
View Article and Find Full Text PDFWith a little help from my friends: importance of protist-protist interactions in structuring marine protistan communities in the San Pedro Channel.
mSystems
January 2025
Department of Biological Sciences, University of Southern California, Los Angeles, California, USA.
Unlabelled: Marine protists form complex communities that are shaped by environmental and biological ecosystem properties, as well as ecological interactions between organisms. While all of these factors play a role in shaping protistan communities, the specific ways in which these properties and interactions influence protistan communities remain poorly understood. Fourteen years and 9 months of eukaryotic amplicon (18S-V4 rRNA gene) data collected monthly at the San Pedro Ocean Time-series (SPOT) station were used to evaluate the impacts that environmental and biological factors, and protist-protist interactions had on protistan community composition.
View Article and Find Full Text PDFEmerging Per- and Polyfluoroalkyl Substances in Tap Water from the American Healthy Homes Survey II.
Environ Sci Technol
January 2025
U.S. Environmental Protection Agency/Office of Research and Development, Durham, North Carolina 27711, United States.
Humans experience widespread exposure to anthropogenic per- and polyfluoroalkyl substances (PFAS) through various media, which can lead to a wide range of negative health impacts. Tap water is an important source of exposure in communities with any degree of contamination but routine or large-scale PFAS monitoring often depends on targeted analytical methods limited to measuring specific PFAS. We analyzed 680 tap water samples from the American Healthy Homes Survey II for PFAS using non-targeted analysis (NTA) to expand the range of detectable PFAS.
View Article and Find Full Text PDFCharacteristics and outcomes of communities of practice in allied health educators: rapid review.
J Interprof Care
January 2025
University of South Australia Allied Health and Human Performance, South Australia, Australia.
Allied health clinical educators (AHCEs) are vital to health professional student education and clinical education is often expected in a job role. Communities of practice (CoPs) may be a strategy to meet educator learning needs. A rapid review was conducted to determine the structures, purposes, and outcomes of AHCE CoPs, and barriers or enablers of participation in CoPs.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!