نتایج جستجو برای: archaea

تعداد نتایج: 7833  

Journal: :Applied and environmental microbiology 2004
Wilfred F M Röling Ivana R de Brito Couto Richard P J Swannell Ian M Head

While the contribution of Bacteria to bioremediation of oil-contaminated shorelines is well established, the response of Archaea to spilled oil and bioremediation treatments is unknown. The relationship between archaeal community structure and oil spill bioremediation was examined in laboratory microcosms and in a bioremediation field trial. 16S rRNA gene-based PCR and denaturing gradient gel a...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1996
S M Barns C F Delwiche J D Palmer N R Pace

Phylogenetic analysis of ribosomal RNA sequences obtained from uncultivated organisms of a hot spring in Yellowstone National Park reveals several novel groups of Archaea, many of which diverged from the crenarchaeal line of descent prior to previously characterized members of that kingdom. Universal phylogenetic trees constructed with the addition of these sequences indicate monophyly of Archa...

Journal: :Biochemical Society transactions 2001
S D Bell C P Magill S P Jackson

The basal transcription machinery of Archaea is fundamentally related to the eucaryal RNA polymerase (RNAP) II apparatus. In addition to a 12-subunit RNAP, Archaea possess two general transcription factors, the activities of which are required for accurate and efficient in vitro transcription. These factors, TBP and TFB, are homologues of the eucaryal TATA-box binding protein and TFIIB respecti...

Journal: :Genome research 2003
Neil F W Saunders Torsten Thomas Paul M G Curmi John S Mattick Elizabeth Kuczek Rob Slade John Davis Peter D Franzmann David Boone Karl Rusterholtz Robert Feldman Chris Gates Shellie Bench Kevin Sowers Kristen Kadner Andrea Aerts Paramvir Dehal Chris Detter Tijana Glavina Susan Lucas Paul Richardson Frank Larimer Loren Hauser Miriam Land Ricardo Cavicchioli

We generated draft genome sequences for two cold-adapted Archaea, Methanogenium frigidum and Methanococcoides burtonii, to identify genotypic characteristics that distinguish them from Archaea with a higher optimal growth temperature (OGT). Comparative genomics revealed trends in amino acid and tRNA composition, and structural features of proteins. Proteins from the cold-adapted Archaea are cha...

Journal: :Journal of bacteriology 1999
M Nishihara T Yamazaki T Oshima Y Koga

In Methanobacterium thermoautotrophicum, sn-glycerol-1-phosphate (G-1-P) dehydrogenase is responsible for the formation of the Archaea-specific backbone of phospholipids, G-1-P, from dihydroxyacetonephosphate (DHAP). The possible G-1-P-forming activities were surveyed in cell-free extracts of six species of Archaea. All the archaeal cell-free homogenates tested revealed the ability to form G-1-...

2003
Edward F. DeLong

E arth’s microbiota is remarkably pervasive, thriving at extremely high temperature, low and high pH, high salinity, and low water availability. One lineage of microbial life in particular, the Archaea, is especially adept at exploiting environmental extremes. Despite their success in these challenging habitats, the Archaea may now also be viewed as a cosmopolitan lot. These microbes exist in a...

Journal: :Applied and environmental microbiology 1995
J O McInerney M Wilkinson J W Patching T M Embley R Powell

In 1992, two independent reports based on small-subunit rRNA gene (SSU rDNA) cloning revealed the presence of novel Archaea among marine bacterioplankton. Here, we report the presence of further novel Archaea SSU rDNA sequences recovered from the midgut contents of a deep-sea marine holothurian. Phylogenetic analyses show that these abyssal Archaea are a paraphyletic component of a highly diver...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1999
M A Greagg M J Fogg G Panayotou S J Evans B A Connolly L H Pearl

Deamination of cytosine to uracil is the most common promutagenic change in DNA, and it is greatly increased at the elevated growth temperatures of hyperthermophilic archaea. If not repaired to cytosine prior to replication, uracil in a template strand directs incorporation of adenine, generating a G.C --> A.U transition mutation in half the progeny. Surprisingly, genomic analysis of archaea ha...

2017
Takunari Kono Sandhya Mehrotra Chikako Endo Natsuko Kizu Mami Matusda Hiroyuki Kimura Eiichi Mizohata Tsuyoshi Inoue Tomohisa Hasunuma Akiho Yokota Hiroyoshi Matsumura Hiroki Ashida

Two enzymes are considered to be unique to the photosynthetic Calvin-Benson cycle: ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), responsible for CO2 fixation, and phosphoribulokinase (PRK). Some archaea possess bona fide RuBisCOs, despite not being photosynthetic organisms, but are thought to lack PRK. Here we demonstrate the existence in methanogenic archaea of a carbon metabolic ...

2017
Kaisa Koskinen Manuela R. Pausan Alexandra K. Perras Michael Beck Corinna Bang Maximilian Mora Anke Schilhabel Ruth Schmitz Christine Moissl-Eichinger

Human-associated archaea remain understudied in the field of microbiome research, although in particular methanogenic archaea were found to be regular commensals of the human gut, where they represent keystone species in metabolic processes. Knowledge on the abundance and diversity of human-associated archaea is extremely limited, and little is known about their function(s), their overall role ...

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