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Artykuły w czasopismach na temat "Rumen archaea (methanogens)"
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Singh, K. M., A. K. Tripathi, P. R. Pandya, S. Parnerkar, R. K. Kothari i C. G. Joshi. "Molecular Genetic Diversity and Quantitation of Methanogen in Ruminal Fluid of Buffalo (Bubalus bubalis) Fed Ration (Wheat Straw and Concentrate Mixture Diet)". Genetics Research International 2013 (5.06.2013): 1–7. http://dx.doi.org/10.1155/2013/980191.
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High roughage diet causes more methane emissions; however, the total methanogen abundance is not influenced by roughage proportion. Technologies to reduce methane emissions are lacking, and development of inhibitors and vaccines that mitigate rumen-derived methane by targeting methanogens relies on present knowledge of the methanogens. In this work, we have investigated molecular diversity of rumen methanogens of Surti buffalo. DNA from rumen fluid was extracted, and 16S rRNA encoding genes were amplified using methanogen specific primer to generate 16S rDNA clone libraries. Seventy-six clones were randomly selected and analysed by RFLP resulting in 21 operational taxonomic units (OTUs). BLAST analysis with available sequences in database revealed sequences of 13 OTUs (55 clones) showing similarity with Methanomicrobium sp, 3 OTUs (15 clones) with Methanobrevibacter sp. The remaining 5 OTUs (6 clones) belonged to uncultured archaea. The phylogenetic analysis indicated that methanogenic communities found in the library were clustered in the order of Methanomicrobiales (18 OTUs) and Methanobacteriales (3 OTUs). The population of Methanomicrobiales, Methanobacteriales, and Methanococcales were also observed, accounting for 1.94%, 0.72%, and 0.47% of total archaea, respectively.
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Williams, Yvette J., Sam Popovski, Suzanne M. Rea, Lucy C. Skillman, Andrew F. Toovey, Korinne S. Northwood i André-Denis G. Wright. "A Vaccine against Rumen Methanogens Can Alter the Composition of Archaeal Populations". Applied and Environmental Microbiology 75, nr 7 (6.02.2009): 1860–66. http://dx.doi.org/10.1128/aem.02453-08.
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ABSTRACT The objectives of this study were to formulate a vaccine based upon the different species/strains of methanogens present in sheep intended to be immunized and to determine if a targeted vaccine could be used to decrease the methane output of the sheep. Two 16S rRNA gene libraries were used to survey the methanogenic archaea in sheep prior to vaccination, and methanogens representing five phylotypes were found to account for >52% of the different species/strains of methanogens detected. A vaccine based on a mixture of these five methanogens was then formulated, and 32 sheep were vaccinated on days 0, 28, and 103 with either a control or the anti-methanogen vaccine. Enzyme-linked immunosorbent assay analysis revealed that each vaccination with the anti-methanogen formulation resulted in higher specific immunoglobulin G titers in plasma, saliva, and rumen fluid. Methane output levels corrected for dry-matter intake for the control and treatment groups were not significantly different, and real-time PCR data also indicated that methanogen numbers were not significantly different for the two groups after the second vaccination. However, clone library data indicated that methanogen diversity was significantly greater in sheep receiving the anti-methanogen vaccine and that the vaccine may have altered the composition of the methanogen population. A correlation between 16S rRNA gene sequence relatedness and cross-reactivity for the methanogens (R 2 = 0.90) also exists, which suggests that a highly specific vaccine can be made to target specific strains of methanogens and that a more broad-spectrum approach is needed for success in the rumen. Our data also suggest that methanogens take longer than 4 weeks to adapt to dietary changes and call into question the validity of experimental results based upon a 2- to 4-week acclimatization period normally observed for bacteria.
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Ohene-Adjei, Samuel, Ronald M. Teather, Michael Ivan i Robert J. Forster. "Postinoculation Protozoan Establishment and Association Patterns of Methanogenic Archaea in the Ovine Rumen". Applied and Environmental Microbiology 73, nr 14 (18.05.2007): 4609–18. http://dx.doi.org/10.1128/aem.02687-06.
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ABSTRACT Association patterns between archaea and rumen protozoa were evaluated by analyzing archaeal 16S rRNA gene clone libraries from ovine rumen inoculated with different protozoa. Five protozoan inoculation treatments, fauna free (negative control), holotrich and cellulolytic protozoa, Isotricha and Dasytricha spp., Entodinium spp., and total fauna (type A) were tested. We used denaturing gradient gel electrophoresis, quantitative PCR, and phylogenetic analysis to evaluate the impact of the protozoan inoculants on the respective archaeal communities. Protozoan 18S ribosomal DNA clone libraries were also evaluated to monitor the protozoal population that was established by the inoculation. Phylogenetic analysis suggested that archaeal clones associated with the fauna-free, the Entodinium, and the type A inoculations clustered primarily with uncultured phylotypes. Polyplastron multivesiculatum was the predominant protozoan strain established by the holotrich and cellulolytic protozoan treatment, and this resulted predominantly in archaeal clones affiliated with uncultured and cultured methanogenic phylotypes (Methanosphaera stadtmanae, Methanobrevibacter ruminantium, and Methanobacterium bryantii). Furthermore, the Isotricha and Dasytricha inoculation treatment resulted primarily in archaeal clones affiliated with Methanobrevibacter smithii. This report provides the first assessment of the influence of protozoa on archaea within the rumen microbial community and provides evidence to suggest that different archaeal phylotypes associate with specific groups of protozoa. The observed patterns may be linked to the evolution of commensal and symbiotic relationships between archaea and protozoa in the ovine rumen environment. This report further underscores the prevalence and potential importance of a rather large group of uncultivated archaea in the ovine rumen, probably unrelated to known methanogens and undocumented in the bovine rumen.
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Yu, Zhongtang, Rubén García-González, Floyd L. Schanbacher i Mark Morrison. "Evaluations of Different Hypervariable Regions of Archaeal 16S rRNA Genes in Profiling of Methanogens by Archaea-Specific PCR and Denaturing Gradient Gel Electrophoresis". Applied and Environmental Microbiology 74, nr 3 (14.12.2007): 889–93. http://dx.doi.org/10.1128/aem.00684-07.
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ABSTRACT Different hypervariable (V) regions of the archaeal 16S rRNA gene (rrs) were compared systematically to establish a preferred V region(s) for use in Archaea-specific PCR-denaturing gradient gel electrophoresis (DGGE). The PCR products of the V3 region produced the most informative DGGE profiles and permitted identification of common methanogens from rumen samples from sheep. This study also showed that different methanogens might be detected when different V regions are targeted by PCR-DGGE. Dietary fat appeared to transiently stimulate Methanosphaera stadtmanae but inhibit Methanobrevibacter sp. strain AbM4 in rumen samples.
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Attwood, Graeme, i Christopher McSweeney. "Methanogen genomics to discover targets for methane mitigation technologies and options for alternative H2 utilisation in the rumen". Australian Journal of Experimental Agriculture 48, nr 2 (2008): 28. http://dx.doi.org/10.1071/ea07203.
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Reducing ruminant methane emissions is an important objective for ensuring the sustainability of ruminant-based agriculture. Methane is formed in the rumen by methanogens (part of the domain Archaea), mainly from H2 and CO2. Methanogens from a wide range of habitats are being genome-sequenced to gain a better understanding of their biology and, in particular, to identify targets for inhibition technologies for gut-associated methanogens. Genome comparisons are identifying common genes that define a methanogen, while gene differences are providing an insight into adaptations that allow methanogen survival and persistence under different environmental conditions. Within the rumen microbial food web, methanogens perform the beneficial task of removing H2, which allows reduced cofactors to be reoxidised and recycled, thereby enhancing the breakdown and fermentation of plant material. Therefore, rumen methane mitigation strategies need to consider alternative routes of H2 utilisation in the absence (or decreased levels) of methanogenesis to maintain rumen function. Two main alternatives are possible: enhancing rumen microorganisms that carry out reductive acetogenesis (combining CO2 and H2 to form acetate) or promotion of organisms that consume reducing equivalents during the conversion of metabolic intermediates (malate, fumarate and crotonate) into propionate and butyrate. A better understanding of the role and scale of methane oxidation in the rumen may also lead to future options for methane mitigation.
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Chaban, Bonnie, Sandy Y. M. Ng i Ken F. Jarrell. "Archaeal habitats — from the extreme to the ordinary". Canadian Journal of Microbiology 52, nr 2 (1.02.2006): 73–116. http://dx.doi.org/10.1139/w05-147.
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The domain Archaea represents a third line of evolutionary descent, separate from Bacteria and Eucarya. Initial studies seemed to limit archaea to various extreme environments. These included habitats at the extreme limits that allow life on earth, in terms of temperature, pH, salinity, and anaerobiosis, which were the homes to hyper thermo philes, extreme (thermo)acidophiles, extreme halophiles, and methanogens. Typical environments from which pure cultures of archaeal species have been isolated include hot springs, hydrothermal vents, solfataras, salt lakes, soda lakes, sewage digesters, and the rumen. Within the past two decades, the use of molecular techniques, including PCR-based amplification of 16S rRNA genes, has allowed a culture-independent assessment of microbial diversity. Remarkably, such techniques have indicated a wide distribution of mostly uncultured archaea in normal habitats, such as ocean waters, lake waters, and soil. This review discusses organisms from the domain Archaea in the context of the environments where they have been isolated or detected. For organizational purposes, the domain has been separated into the traditional groups of methanogens, extreme halophiles, thermoacidophiles, and hyperthermophiles, as well as the uncultured archaea detected by molecular means. Where possible, we have correlated known energy-yielding reactions and carbon sources of the archaeal types with available data on potential carbon sources and electron donors and acceptors present in the environments. From the broad distribution, metabolic diversity, and sheer numbers of archaea in environments from the extreme to the ordinary, the roles that the Archaea play in the ecosystems have been grossly underestimated and are worthy of much greater scrutiny.Key words: Archaea, methanogen, extreme halophile, hyperthermophile, thermoacidophile, uncultured archaea, habitats.
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Wright, Andr�-Denis G., Andrew J. Williams, Barbara Winder, Claus T. Christophersen, Sharon L. Rodgers i Kellie D. Smith. "Molecular Diversity of Rumen Methanogens from Sheep in Western Australia". Applied and Environmental Microbiology 70, nr 3 (marzec 2004): 1263–70. http://dx.doi.org/10.1128/aem.70.3.1263-1270.2004.
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ABSTRACT The molecular diversity of rumen methanogens in sheep in Australia was investigated by using individual 16S rRNA gene libraries prepared from the rumen contents obtained from six merino sheep grazing pasture (326 clones), six sheep fed an oaten hay-based diet (275 clones), and five sheep fed a lucerne hay-based diet (132 clones). A total of 733 clones were examined, and the analysis revealed 65 phylotypes whose sequences (1,260 bp) were similar to those of cultivated methanogens belonging to the order Methanobacteriales. Pasture-grazed sheep had more methanogen diversity than sheep fed either the oaten hay or lucerne hay diet. Methanobrevibacter strains SM9, M6, and NT7 accounted for over 90% of the total number of clones identified. M6 was more prevalent in grazing sheep, and SM9, despite being found in 16 of the 17 sheep, was more prevalent in sheep fed the lucerne-based diet. Five new species were identified. Two of these species exhibited very little sequence similarity to any cultivated methanogens and were found eight times in two of the six sheep that were grazing pasture. These unique sequences appear to represent a novel group of rumen archaea that are atypical for the rumen environment.
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Malik, P. K., S. Trivedi, A. Mohapatra, A. P. Kolte, V. Sejian, R. Bhatta i H. Rahman. "Comparison of enteric methane yield and diversity of ruminal methanogens in cattle and buffaloes fed on the same diet". PLOS ONE 16, nr 8 (11.08.2021): e0256048. http://dx.doi.org/10.1371/journal.pone.0256048.
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An in vivo study was conducted to compare the enteric methane emissions and diversity of ruminal methanogens in cattle and buffaloes kept in the same environment and fed on the same diet. Six cattle and six buffaloes were fed on a similar diet comprising Napier (Pennisetum purpureum) green grass and concentrate in 70:30. After 90 days of feeding, the daily enteric methane emissions were quantified by using the SF6 technique and ruminal fluid samples from animals were collected for the diversity analysis. The daily enteric methane emissions were significantly greater in cattle as compared to buffaloes; however, methane yields were not different between the two species. Methanogens were ranked at different taxonomic levels against the Rumen and Intestinal Methanogen-Database. The archaeal communities in both host species were dominated by the phylum Euryarchaeota; however, Crenarchaeota represented <1% of the total archaea. Methanogens affiliated with Methanobacteriales were most prominent and their proportion did not differ between the two hosts. Methanomicrobiales and Methanomassillicoccales constituted the second largest group of methanogens in cattle and buffaloes, respectively. Methanocellales (Methanocella arvoryza) were exclusively detected in the buffaloes. At the species level, Methanobrevibacter gottschalkii had the highest abundance (55–57%) in both the host species. The relative abundance of Methanobrevibacter wolinii between the two hosts differed significantly. Methanosarcinales, the acetoclastic methanogens were significantly greater in cattle than the buffaloes. It is concluded that the ruminal methane yield in cattle and buffaloes fed on the same diet did not differ. With the diet used in this study, there was a limited influence (<3.5%) of the host on the structure of the ruminal archaea community at the species level. Therefore, the methane mitigation strategies developed in either of the hosts should be effective in the other. Further studies are warranted to reveal the conjunctive effect of diet and geographical locations with the host on ruminal archaea community composition.
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Pandey, Ashish Kumar, Neelava Das, Kumar A. Muthu i Srinivasa Rao. "Methanogens in the Environment: An Insight of Methane Yield and Impact on Global Climate Change". International Letters of Natural Sciences 37 (kwiecień 2015): 51–60. http://dx.doi.org/10.18052/www.scipress.com/ilns.37.51.
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Methane is a most important greenhouse gas for planetary heating and it’s produced by methanogenic microorganisms as a metabolic byproduct and creates climate change. Methanogens are ancient organisms on earth found in anaerobic environments and methane is a key greenhouse gas concerned with methanogens. Therefore here is intense interest to writing this paper. A number of experiments have already conducted to study the methanogens in various environments such as rumen and intestinal system of animals, fresh water and marine sediments, swamps and marshes, hot springs, sludge digesters, and within anaerobic protozoa which utilize carbon dioxide in the presence of hydrogen and produce methane. The diversity of methanogens, belong to the domain Archaea and get involved in biological production of methane that catalyzes the degradation of organic compound as a part of global carbon cycle called methanogenesis. Majorly in this article we summaries the diversity of methanogens and their impact on global warming.
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Faseleh Jahromi, Mohammad, Juan Boo Liang, Rosfarizan Mohamad, Yong Meng Goh, Parisa Shokryazdan i Yin Wan Ho. "Lovastatin-Enriched Rice Straw Enhances Biomass Quality and Suppresses Ruminal Methanogenesis". BioMed Research International 2013 (2013): 1–13. http://dx.doi.org/10.1155/2013/397934.
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The primary objective of this study was to test the hypothesis that solid state fermentation (SSF) of agro-biomass (using rice straw as model); besides, breaking down its lignocellulose content to improve its nutritive values also produces lovastatin which could be used to suppress methanogenesis in the rumen ecosystem. Fermented rice straw (FRS) containing lovastatin after fermentation withAspergillus terreuswas used as substrate for growth study of rumen microorganisms usingin vitrogas production method. In the first experiment, the extract from the FRS (FRSE) which contained lovastatin was evaluated for its efficacy for reduction in methane (CH4) production, microbial population, and activity in the rumen fluid. FRSE reduced total gas and CH4productions (P<0.01). It also reduced (P<0.01) total methanogens population and increased the cellulolytic bacteria includingRuminococcus albus,Fibrobacter succinogenes(P<0.01), andRuminococcus flavefaciens(P<0.05). Similarly, FRS reduced total gas and CH4productions, methanogens population, but increasedin vitrodry mater digestibility compared to the non-fermented rice straw. Lovastatin in the FRSE and the FRS significantly increased the expression of HMG-CoA reductase gene that produces HMG-CoA reductase, a key enzyme for cell membrane production in methanogenic Archaea.
Rozprawy doktorskie na temat "Rumen archaea (methanogens)"
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Christophersen, Claus. "Grain and artificial stimulation of the rumen change the abundance and diversity of methanogens and their association with ciliates". University of Western Australia. School of Animal Biology, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0114.
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[Truncated abstract] In Australia, there is pressure to reduce the amount of methane produced by ruminant livestock because they are the single largest source of methane emitted from anthropogenic sources, accounting for 70.7% of agricultural methane emissions. In addition, methane production represents a loss of gross energy intake to the animal. The organisms that are responsible for methane production in the animal gut are a distinct group of Archaea called methanogens. Methanogens occupy three different niches within the rumen. Some live freely in the rumen digesta (planktonic), others are attached to the outer surface of the rumen ciliates (ectosymbiotic), and some reside within the ciliates (endosymbiotic). The types and number of methanogens, as well as rumen ciliates and their symbiotic interactions, influence the amount of methane produced from the rumen. These factors in turn are affected by many factors, including diet and ruminal retention time. In this thesis, I tested the general hypothesis that increasing the amount of grain in the diet and reducing the retention time would affect the abundance and diversity of methanogens in their different niches, including their association with ruminal ciliates. Twenty-four fistulated sheep were used in a complete factorial design with the sheep randomly divided into four groups. ... The change in DGGE banding patterns and Shannon indices when sheep were fed grain indicated that the types of methanogens changed when sheep were fed low and high grain diets, but their diversity did not. In contrast, the diversity of rumen ciliates decreased when sheep were fed a high grain diet. A total of 18 bands from the DGGE analysis of the ciliates were sequenced. All except one, which was 98% similar to Cycloposthium sp. not found previously in the rumen, matched the sequences for previously identified rumen ciliates. Some of the rumen ciliates identified were not present in sheep fed the high grain diet. On a high grain diet, methanogens associate endosymbiotically with rumen ciliates to get better access to hydrogen. It appears that the association between methanogens and rumen ciliates is dictated by the availability of hydrogen in the rumen and not the generic composition of the ciliate population. Furthermore, endosymbiotic methanogens appear to produce less methane than methanogens in other niches. The pot scrubbers did not change ruminal retention time but they did reduce the acetate/propionate measurements observed in sheep on the high grain treatment. The reason why pot scrubbers had this effect remains unknown, but it is interesting to consider that some physical interaction has occurred between the pot scrubbers, the grain and the sheep that has improved the fermentation parameters in sheep fed a high grain diet. The results from this study have advanced our understanding of the interaction between methanogens and ruminal ciliates, and methanogenesis in the rumen in response to dietary changes and mechanical challenges. Extending this work to look more specifically at the species of methanogens that are most closely linked to high methane production and how they interact with the ruminal ciliates will be critical for manipulating enteric greenhouse gas emissions.
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Cersosimo, Laura M., Melissa L. Bainbridge, Jana Kraft i André-Denis G. Wright. "Influence of periparturient and postpartum diets on rumen methanogen communities in three breeds of primiparous dairy cows". BIOMED CENTRAL LTD, 2016. http://hdl.handle.net/10150/614742.
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Background: Enteric methane from rumen methanogens is responsible for 25.9 % of total methane emissions in the United States. Rumen methanogens also contribute to decreased animal feed efficiency. For methane mitigation strategies to be successful, it is important to establish which factors influence the rumen methanogen community and rumen volatile fatty acids (VFA). In the present study, we used next-generation sequencing to determine if dairy breed and/or days in milk (DIM) (high-fiber periparturient versus high-starch postpartum diets) affect the rumen environment and methanogen community of primiparous Holstein, Jersey, and Holstein-Jersey crossbreeds. Results: When the 16S rRNA gene sequences were processed and assigned to operational taxonomic units (OTU), a core methanogen community was identified, consisting of Methanobrevibacter (Mbr.) smithii, Mbr. thaueri, Mbr. ruminantium, and Mbr. millerae. The 16S rRNA gene sequence reads clustered at 3 DIM, but not by breed. At 3 DIM, the mean % abundance of Mbr. thaueri was lower in Jerseys (26.9 %) and higher in Holsteins (30.7 %) and Holstein-Jersey crossbreeds (30.3 %) (P < 0.001). The molar concentrations of total VFA were higher at 3 DIM than at 93, 183, and 273 DIM, whereas the molar proportions of propionate were increased at 3 and 93 DIM, relative to 183 and 273 DIM. Rumen methanogen densities, distributions of the Mbr. species, and VFA molar proportions did not differ by breed. Conclusions: The data from the present study suggest that a core methanogen community is present among dairy breeds, through out a lactation. Furthermore, the methanogen communities were more influenced by DIM and the breed by DIM interactions than breed differences.
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Popova, Milka. "Structure et activité de la communauté des Archaea méthanogènes du rumen en relation avec la production de méthane par les ruminants". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2011. http://tel.archives-ouvertes.fr/tel-00741981.
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Le méthane (CH4) est un des principaux gaz à effet de serre. L'élevage est à l'origine d'un tiers du CH4 produit par l'activité humaine en Europe. En plus, la production de CH4 représente une perte de 2% à 12 % de l'énergie consommée par l'animal. La méthanogenèse est le résultat de l'activité d'un groupe de microorganismes particuliers - les Archaea méthanogènes. La production de CH4 permet de d'éliminer du milieu ruminal l'hydrogène produit au cours de la fermentation des aliments par les autres microorganismes (bactéries, protozoaires, champignons). En effet, l'accumulation d'hydrogène affecte le fonctionnement optimal du rumen. La réduction des émissions de CH4 par les ruminants présente donc un intérêt économique et environnemental non négligeable et passe inévitablement par une modification de l'écosystème microbien du rumen. L'objectif de ce travail de thèse était de relier la production de CH4 avec la structure et l'activité de la communauté méthanogène du rumen. Différents modèles de manipulation de l'écosystème microbien ruminal comme la défaunation (élimination des protozoaires) et l'utilisation d'aliments connus pour modifier la méthanogenèse ont été utilisés. Le rumen étant un écosystème complexe, les interactions fonctionnelles entre les Archaea méthanogènes et les autres microorganismes présents (bactéries et protozoaires) ont également été étudiées. Dans cette optique, des outils de biologie moléculaire, permettant de cibler les principales communautés microbiennes, ont été optimisés. Nos travaux permettent de conclure sur l'absence de relation claire entre le nombre (et/ou la concentration) des Archaea méthanogènes et la méthanogenèse dans le rumen. Cependant les réductions des émissions de CH4 ont été attribuées aux changements dans la diversité de la communauté méthanogène et la disponibilité en hydrogène. Ce travail de thèse a mis en évidence que les modifications de la composition et/ou de l'activité métabolique de la communauté des Archaea méthanogènes seraient à l'origine des réductions des émissions de CH4 par les ruminants. Une meilleure connaissance des mécanismes microbiens impliqués dans la production de méthane permettra d'envisager de nouvelles pistes pour diminuer les émissions chez les ruminants.
Części książek na temat "Rumen archaea (methanogens)"
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Ushida, Kazunari. "Symbiotic Methanogens and Rumen Ciliates". W (Endo)symbiotic Methanogenic Archaea, 25–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13615-3_3.
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Ushida, Kazunari. "Symbiotic Methanogens and Rumen Ciliates". W (Endo)symbiotic Methanogenic Archaea, 25–35. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-98836-8_3.
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