BACTERIAS DEGRADADORAS DE CELULOSA PDF

Directory of Open Access Journals Sweden. El objetivo de este estudio fue evaluar la actividad antimicrobiana del aceite esencial de Salvia officinalis L. El aceite esencial de S. The rumen is a large pregastric fermentation compartment foregut , which maintains a diverse but concentrated population of anaerobic bacteria, protozoa and fungi that are responsible for a variety of degradative and fermentative reactions.

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The current energy crisis and depletion of fossil fuel reserves has encouraged research for new alternatives. Degradation of plant material by enzymatic reactions represents an important strategy to obtain affordable and renewable energy. In nature, several beetle species have solved this problem by Assessment of microbial communities associated with the gut and feeding substrate of three xylophagous coleopteran families with emphasis on cellulose-degrading bacteria The current energy crisis and depletion of fossil fuel reserves has encouraged research for new alternatives.

In nature, several beetle species have solved this problem by developing digestive systems colonized by specialized microbiota capable of breaking down recalcitrant carbon through cellulose- breaking enzymes, releasing sugars that later are used as nutrients.

Therefore, their associated microbes represent potential sources of novel bioenergy-relevant molecules. Previous work, centered on one beetle Family Passalidae from one location in Costa Rica, revealed the occurrence of distinct microbial communities among larvae, adults and their woody substrate inside the same decomposing log.

Furthermore, larval metagenomes were enriched in Firmicutes particularly Ruminococcaceae sequences and they harbor multiple genes coding for cellulose degrading enzymes.

In the present study, I first evaluated whether the unique communities observed for Passalid beetles remain stable in other locations and compared them with other families of xylophagous beetles. These samples included the intestinal content of beetles larvae and adults belonging to 3 different families Passalidae, Scarabaeidae and Cerambycidae and the woody substrate they consume.

Employing NMDS analyses, I confirmed that microbial communities are mainly driven by sample type larvae, adult or substrate , but are also influenced by the other two variables: beetle family and geographic location. The high abundance of Ruminococcaceae OTUs in larvae suggests an important role of these organisms in the overall gut metabolism and cellulose breakdown from the wood they feed on. To evaluate this possibility, available metagenomes and a collection of metagenome assembled genomes MAGs from Passalid beetles were employed to analyze the potential of the Ruminococcaceae family to degrade cellulose.

Furthermore, out of the 11 Ruminococcaceae MAGs assembled in this work, 9 did not cluster with any of the reference genomes included in the analysis. Four of them have putative cellulases, while two of them, Bin and , have gene clusters with several components related to cellulosomes. The present work suggests that anaerobic bacteria, such as Ruminococcaceae, are dominant members of the microbial community in the digestive tracts of Scarabaeidae and Passalidae larvae. Further, these organisms seem to partake directly in cellulose degradation and they also intervene in other metabolic reactions.

Considering that these MAGs represent potentially undescribed organisms that are both present in high abundance in the gut of these xylophagous beetles and encode for important genes necessary to obtain nutrients out of their recalcitrant food source, they are ideal candidates for further isolation in pure culture to elucidate their definitive role in this system.

Cuatro de estos MAGs tienen potenciales celulasas, y entre ellos, el Bin y el Bin tienen agrupaciones de genes relacionados con la estructura de celulosomas. Los resultados anteriores sugieren que bacterias anaerobias, como Ruminococcaceae, son miembros dominantes de la comunidad microbiana en los tractos digestivos de las larvas de la familia Scarabaeidae y Passalidae.

Similar Items Ultrastructural and microbial analyses of cellulose degradation in leaf-cutter ant colonies by: Moreira Soto, Rolando Daniel, et al. Published: Community richness of amphibian skin bacteria correlates with bioclimate at the global scale by: Kueneman, Jordan G. Published: Heterotrophic microbial activity and organic matter degradation in coastal lagoons of Colombia by: Gocke, Klaus, et al. Published: Assessment of microbial communities associated with the gut and feeding substrate of three xylophagous coleopteran families with emphasis on cellulose-degrading bacteria.

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The current energy crisis and depletion of fossil fuel reserves has encouraged research for new alternatives. Degradation of plant material by enzymatic reactions represents an important strategy to obtain affordable and renewable energy. In nature, several beetle species have solved this problem by Assessment of microbial communities associated with the gut and feeding substrate of three xylophagous coleopteran families with emphasis on cellulose-degrading bacteria The current energy crisis and depletion of fossil fuel reserves has encouraged research for new alternatives. In nature, several beetle species have solved this problem by developing digestive systems colonized by specialized microbiota capable of breaking down recalcitrant carbon through cellulose- breaking enzymes, releasing sugars that later are used as nutrients. Therefore, their associated microbes represent potential sources of novel bioenergy-relevant molecules. Previous work, centered on one beetle Family Passalidae from one location in Costa Rica, revealed the occurrence of distinct microbial communities among larvae, adults and their woody substrate inside the same decomposing log.

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The isolation of cellulolytic bacteria, which hydrolyze cellulose to cellobiose and glucose, can provide useful information about rumen diversity. To identify and characterize a microorganism capable of hydrolyzing cellulose, isolated from a cow rumen. Anaerobic culture techniques were used for isolating cellulose-degrading rumen bacteria. The isolated bacterium showed cellulolytic activity detected with Congo red; besides, glycerol, ribose, xylose, sucrose, galactose and glucose were fermented by this bacterium. Phylogenetic analysis of 16S rRNA genes showed that the rumen isolated bacterium was a member of the genus Shigella , which, under mesophilic conditions, is an interesting candidate for obtaining oligosaccharides from lignocellulosic biomass. Identificar y caracterizar un microorganismo capaz de hidrolizar celulosa, aislado de un rumen vacuno.

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Show simple item record. JavaScript is disabled for your browser. Some features of this site may not work without it. Show simple item record Anaerobic degradation of marine algae, seagrass and tropical climbing vines to produce a renewable energy source and the analysis of their anaerobic microbial communities dc. It has been proposed, in terms of renewable systems, the use of biofuels generated by the degradation of organic matter, like bioethanol, biodiesel and methane, being this last one the more efficient one based on its calorific value. For this reason we propose the implementation of anaerobic reactors which degrade biomass that has relatively high growth rates, require low quantity of nutrients and eliminate any competition by its use, thus creating a cost-effective system. Tropical climbing vines provide biomasses with the previous characteristics; however, they contain high concentrations of cellulose and lignin that are polymers difficult to degrade.

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