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To provide new insight into the dark fermentation process, a multi-lateral study was performed to study the microbiology of 20 different lab-scale bioreactors operated in four different countries (Brazil, Chile, Mexico, and Uruguay). Samples (29) were collected from bioreactors with different configurations, operation conditions, and performances. The microbial communities were analyzed using 16S rRNA genes 454 pyrosequencing. The results showed notably uneven communities with a high predominance of a particular genus. The phylum Firmicutes predominated in most of the samples, but the phyla Thermotogae or Proteobacteria dominated in a few samples. Genera from three physiological groups were detected: high-yield hydrogen producers (Clostridium, Kosmotoga, Enterobacter), fermenters with low-hydrogen yield (mostly from Veillonelaceae), and competitors (Lactobacillus). Inocula, reactor configurations, and substrates influence the microbial communities. This is the first joint effort that evaluates hydrogen-producing reactors and operational conditions from different countries and contributes to understand the dark fermentation process.
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http://dx.doi.org/10.1007/s00253-016-7325-y | DOI Listing |
Anim Microbiome
December 2024
Museum of Vertebrate Zoology, University of California, Berkeley, 3101 Valley Life Sciences Building, Berkeley, CA, 94720-3160, USA.
Background: Species host diverse microbial communities that can impact their digestion and health, which has led to much interest in understanding the factors that influence their microbiota. We studied the developmental, environmental, and social factors that influence the microbiota of nestling barn owls (Tyto alba) through a partial cross-fostering experiment that manipulated the social and nest environment of the nestlings. We then examined the nestling microbiota before and three weeks after the exchange of nestlings between nests, along with the microbiota of the adults at the nest and nestlings in unmanipulated nests.
View Article and Find Full Text PDFJ Transl Med
December 2024
Department of Gastroenterology, The First Affiliated Hospital of Sun Yat-sen University, No. 58 Zhongshan Road 2, Guangzhou, Guangdong, 510080, China.
Background: Previous research on the lower gastrointestinal tract has proved that microbial dysbiosis can lead to intestinal barrier dysfunction and enhanced visceral sensitivity, thus triggering bowel symptoms. Whether esophageal microbial dysbiosis also contributes to the development of gastroesophageal reflux (GER) symptoms, which are known to be associated with impaired esophageal barrier integrity, remains to be explored.
Methods: Patients with GER symptoms (gastroesophageal reflux disease [GERD] and functional esophageal disorders [FED]), duodenal ulcer patients and healthy controls were prospectively included for esophageal microbial analysis.
Cell Mol Life Sci
December 2024
Center for Mitochondrial Research and Medicine, College of Medicine Chang Gung University, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan.
Imbalances in gut microbiota and their metabolites have been implicated in osteoporotic disorders. Trimethylamine-n-oxide (TMAO), a metabolite of L-carnitine produced by gut microorganisms and flavin-containing monooxygenase-3, is known to accelerate tissue metabolism and remodeling; however, its role in bone loss remained unexplored. This study investigates the relationship between gut microbiota dysbiosis, TMAO production, and osteoporosis development.
View Article and Find Full Text PDFNPJ Biofilms Microbiomes
December 2024
Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany.
Biofilm-associated peri-implant infections pose a major problem in modern medicine. The understanding of biofilm development is hampered by biofilm complexity and the lack of robust clinical models. This study comprehensively characterized the dynamics of early biofilm formation in the transmucosal passage of implant abutments in 12 patients.
View Article and Find Full Text PDFTransl Psychiatry
December 2024
Department of Psychiatry, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
Evidence suggests that complex interactions among the gut microbiome, metabolic abnormalities, and brain have important etiological and therapeutic implications in major depressive disorder (MDD). However, the influence of microbiome-gut-brain cross-talk on cognitive impairment in MDD remains poorly characterized. We performed serum metabolomic profiling on 104 patients with MDD and 77 healthy controls (HCs), and also performed fecal metagenomic sequencing on a subset of these individuals, including 79 MDD patients and 60 HCs.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!