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Volume 55,
Issue 3,
2005
Volume 55, Issue 3, 2005
- New Taxa
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- Unicellular Eukaryotes
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Pichia myanmarensis sp. nov., a novel cation-tolerant yeast isolated from palm sugar in Myanmar
More LessFour halotolerant yeast strains, M21T, M34-1, HS054 and D41, were isolated from various foods in South-East Asia. These isolates were most closely related to Pichia anomala, with which each strain had from zero to two differences in the 26S rDNA D1/D2 domain nucleotide sequence; for this reason, they were thought to be the same as, or sister species of, P. anomala. Of the four yeast isolates, only one strain, M21T, had an 18S rDNA sequence that differed from those of P. anomala IFO 10213T and the other three isolates, having 20 substitutions and two gaps. Strain M21T showed lower cation (Li+) tolerance (⩽0·3 M LiCl) than P. anomala IFO 10213T or the other three strains (⩽0·5 M LiCl). Furthermore, the DNA–DNA hybridization data indicated that M21T was clearly distinct from P. anomala IFO 10213T and the other three isolates. The ability of strain M21T to assimilate d-arabinose distinguished it from P. anomala IFO 10213T and the other three isolates; it also differed in that it was able to grow at 37 and 40 °C. Strain M21T grew by multilateral budding, produced persistent asci, in which between one and four hat-shaped ascospores were formed, and contained ubiquinone Q-7. On the basis of this polyphasic characterization, strain M21T represents a novel species within the Q-7-containing group of the genus Pichia, for which the name Pichia myanmarensis is proposed. The type strain is M21T (=NBRC 11090T=JCM 12922T=CBS 9786T).
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- Evolution, Phylogeny And Biodiversity
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Genomic analysis of Hyphomonas neptunium contradicts 16S rRNA gene-based phylogenetic analysis: implications for the taxonomy of the orders ‘Rhodobacterales’ and Caulobacterales
More LessHyphomonas neptunium is a marine prosthecate α-proteobacterium currently classified as a member of the order ‘Rhodobacterales’. Although this classification is supported by 16S rRNA gene sequence phylogeny, 23S rRNA gene sequence analysis, concatenated ribosomal proteins, HSP70 and EF-Tu phylogenies all support classifying Hyphomonas neptunium as a member of the Caulobacterales instead. The possible reasons why the 16S rRNA gene sequence gives conflicting results in this case are also discussed.
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Application of a recN sequence similarity analysis to the identification of species within the bacterial genus Geobacillus
More LessFull-length recN and 16S rRNA gene sequences were determined for a collection of 68 strains from the thermophilic Gram-positive genus Geobacillus, members of which have been isolated from geographically and ecologically diverse locations. Phylogenetic treeing methods clustered the isolates into nine sequence similarity groups, regardless of which gene was used for analysis. Several of these groups corresponded unambiguously to known Geobacillus species, whereas others contained two or more type strains from species with validly published names, highlighting a need for a re-assessment of the taxonomy for this genus. For taxonomic analysis of bacteria related at a genus, species or subspecies level, recN sequence comparisons had a resolving power nearly an order or magnitude greater than 16S rRNA gene comparisons. Mutational saturation rendered recN comparisons much less powerful than 16S rRNA gene comparisons for analysis of higher taxa, however. Analysis of recN sequences should prove a powerful tool for assigning strains to species within Geobacillus, and perhaps within other genera as well.
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Comparative study of overlapping genes in bacteria, with special reference to Rickettsia prowazekii and Rickettsia conorii
More LessOverlapping genes have been proposed as a means of achieving genome reduction by compressing the maximum amount of information in limited sequence space. In this report, comparative analyses of the overlapping genes of genomes of nine bacteria with different lifestyles were performed. The results clearly suggest that overlapping genes may be a result of evolutionary pressure to minimize genome size. The genomes of two closely related obligatory intracellular parasites – Rickettsia prowazekii and Rickettsia conorii – were investigated further. Detailed analyses of these two genomes revealed that mutations at the ends of coding regions and elimination of intergenic DNA are the main forces that determine overlapping of genes.
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- Letters To The Editor
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- International Committee On Systematics Of Prokaryotes
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- Minutes
- Request For An Opinion
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Phylogenetic analysis and description of Eperythrozoon coccoides, proposal to transfer to the genus Mycoplasma as Mycoplasma coccoides comb. nov. and Request for an Opinion
More LessEperythrozoon coccoides, an epierythrocytic organism that causes a mild haemolytic anaemia in laboratory and wild mice, currently is thought to be a rickettsia. To determine the relationship of this agent to other haemotrophic bacterial parasites, the 16S rRNA gene of this organism has been sequenced and it is shown by phylogenetic analysis that this wall-less bacterium is not a rickettsia but actually is a mycoplasma. This mycoplasma shares properties with and is closely related to the other uncultivated mycoplasmas that comprise a recently identified group, the haemotrophic mycoplasmas (haemoplasmas). The haemoplasma group is composed of former Eperythrozoon and Haemobartonella species as well as newly identified haemotrophic mycoplasmas. Haemoplasmas parasitize the surface of erythrocytes of a wide variety of vertebrate animal hosts and are transmitted mainly by blood-feeding arthropod vectors. Because both primary infections and chronic latent infections caused by this bacterium have been observed in many laboratories and this bacterium has been the subject of much experimental work, considerable information exists about this haemotrophic mycoplasma that may be applicable to other haemoplasmas. It is proposed that Eperythrozoon coccoides be reclassified as Mycoplasma coccoides comb. nov. A Request for an Opinion is submitted to the Judicial Commission of the International Committee on Systematics of Prokaryotes regarding this reclassification.
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- Errata
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Volumes and issues
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Volume 75 (2025)
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Volume 74 (2024)
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Volume 73 (2023)
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Volume 72 (2022 - 2023)
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Volume 71 (2020 - 2021)
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Volume 70 (2020)
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Volume 69 (2019)
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Volume 68 (2018)
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Volume 67 (2017)
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Volume 66 (2016)
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Volume 65 (2015)
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Volume 64 (2014)
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Volume 63 (2013)
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Volume 62 (2012)
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Volume 61 (2011)
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Volume 60 (2010)
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Volume 59 (2009)
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Volume 58 (2008)
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Volume 57 (2007)
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Volume 56 (2006)
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Volume 55 (2005)
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Volume 54 (2004)
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Volume 53 (2003)
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Volume 52 (2002)
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Volume 51 (2001)
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Volume 50 (2000)
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Volume 49 (1999)
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Volume 48 (1998)
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Volume 47 (1997)
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Volume 46 (1996)
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Volume 45 (1995)
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Volume 44 (1994)
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Volume 43 (1993)
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Volume 42 (1992)
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Volume 41 (1991)
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Volume 40 (1990)
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Volume 39 (1989)
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Volume 38 (1988)
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Volume 37 (1987)
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Volume 36 (1986)
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Volume 35 (1985)
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Volume 34 (1984)
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Volume 33 (1983)
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Volume 32 (1982)
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Volume 31 (1981)
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Volume 30 (1980)
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Volume 29 (1979)
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Volume 28 (1978)
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Volume 27 (1977)
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Volume 26 (1976)
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Volume 25 (1975)
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Volume 24 (1974)
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Volume 23 (1973)
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Volume 22 (1972)
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Volume 21 (1971)
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Volume 20 (1970)
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Volume 19 (1969)
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Volume 18 (1968)
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Volume 17 (1967)
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Volume 16 (1966)
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Volume 15 (1965)
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Volume 14 (1964)
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Volume 13 (1963)
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Volume 12 (1962)
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Volume 11 (1961)
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Volume 10 (1960)
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Volume 9 (1959)
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Volume 8 (1958)
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Volume 7 (1957)
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Volume 6 (1956)
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Volume 5 (1955)
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Volume 4 (1954)
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Volume 3 (1953)
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Volume 2 (1952)
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Volume 1 (1951)
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