Microbial communities from 20 different hydrogen-producing reactors studied by 454 pyrosequencing. 2016

Claudia Etchebehere, and Elena Castelló, and Jorge Wenzel, and Mélida del Pilar Anzola-Rojas, and Liliana Borzacconi, and Germán Buitrón, and Lea Cabrol, and Vivian María Carminato, and Julian Carrillo-Reyes, and Crhistian Cisneros-Pérez, and Laura Fuentes, and Iván Moreno-Andrade, and Elías Razo-Flores, and Gonzalo Ruiz Filippi, and Estela Tapia-Venegas, and Javiera Toledo-Alarcón, and Marcelo Zaiat
Microbial Ecology Laboratory, BioGem Department, Biological Research Institute Clemente Estable, Ministery of Education, Av. Italia, 3318, Montevideo, Uruguay. cetchebehere@iibce.edu.uy.

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.

UI MeSH Term Description Entries
D007778 Lactobacillus A genus of gram-positive, microaerophilic, rod-shaped bacteria occurring widely in nature. Its species are also part of the many normal flora of the mouth, intestinal tract, and vagina of many mammals, including humans. Lactobacillus species are homofermentative and ferment a broad spectrum of carbohydrates often host-adapted but do not ferment PENTOSES. Most members were previously assigned to the Lactobacillus delbrueckii group. Pathogenicity from this genus is rare.
D007843 Latin America The geographic area of Mexico, Central America, continent of South America and the islands of the Caribbean where Spanish or other Romance language is spoken.
D003013 Clostridium A genus of motile or nonmotile gram-positive bacteria of the family Clostridiaceae. Many species have been identified with some being pathogenic. They occur in water, soil, and in the intestinal tract of humans and lower animals.
D004754 Enterobacter Gram-negative gas-producing rods found in feces of humans and other animals, sewage, soil, water, and dairy products.
D005285 Fermentation Anaerobic degradation of GLUCOSE or other organic nutrients to gain energy in the form of ATP. End products vary depending on organisms, substrates, and enzymatic pathways. Common fermentation products include ETHANOL and LACTIC ACID. Fermentations
D006859 Hydrogen The first chemical element in the periodic table with atomic symbol H, and atomic number 1. Protium (atomic weight 1) is by far the most common hydrogen isotope. Hydrogen also exists as the stable isotope DEUTERIUM (atomic weight 2) and the radioactive isotope TRITIUM (atomic weight 3). Hydrogen forms into a diatomic molecule at room temperature and appears as a highly flammable colorless and odorless gas. Protium,Hydrogen-1
D000068536 Firmicutes A phylum of predominantly GRAM-POSITIVE BACTERIA that includes the orders Bacillales and Clostridiales. Firmicutes and BACTEROIDETES are the two bacterial phyla that constitute the majority of the human gut MICROBIOTA.
D000693 Anaerobiosis The complete absence, or (loosely) the paucity, of gaseous or dissolved elemental oxygen in a given place or environment. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed) Anaerobic Metabolism,Anaerobic Metabolisms,Anaerobioses,Metabolism, Anaerobic,Metabolisms, Anaerobic
D012336 RNA, Ribosomal, 16S Constituent of 30S subunit prokaryotic ribosomes containing 1600 nucleotides and 21 proteins. 16S rRNA is involved in initiation of polypeptide synthesis. 16S Ribosomal RNA,16S rRNA,RNA, 16S Ribosomal,Ribosomal RNA, 16S,rRNA, 16S
D045854 Veillonellaceae A family of gram-negative bacteria, in the phylum FIRMICUTES. Acidaminococcaceae

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