Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Structure of the Large Subunit rDNA from a Diatom, and Comparison Between Small and Large Subunit Ribosomal RNA for Studying Stramenopile Evolution (1998)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 45 (1998), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The aim of this study was to compare the usefulness of complete small and large subunit rRNA, and a combination of both molecules, for reconstructing stramenopile evolution. To this end, phylogenies from species of which both sequences are known Acre constructed with the neighbor-joining, maximum parsimony, and maximum likelihood methods. Also the use of structural features of the rRNAs was evaluated. The large subunit rRNA from the diatom Skeletonema pseudocostatum was sequenced in order to have a more complete taxon sampling, and a group I intron was identified. Our results indicated that heterokont algae are monophyletic, with diatoms diverging first. However, as the analysis was restricted to a particular data set containing merely six taxa, the outcome has limited value for elucidating stramenopile relationships. On the other hand, this approach permits comparison of the performance of both rRNA molecules without interference from other factors, such as a different species selection for each molecule. For the taxa used, the large subunit rRNA clearly contained more phylogenetic information than the small subunit rRNA. Although this result can definitely not be generalized and depends on the phvlogeny to be studied, in some cases determining complete large subunit rRNA sequences certainly seems worthwhile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1998.tb05111.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Oceanic 18S rDNA sequences from picoplankton reveal unsuspected eukaryotic diversity (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 409 (2001), S. 607-610 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Picoplankton—cells with a diameter of less than 3 µm—are the dominant contributors to both primary production and biomass in open oceanic regions. However, compared with the prokaryotes, the eukaryotic component of picoplankton is still poorly known. Recent discoveries ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35054541
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    16S rRNA gene sequence analyses and inter- and intrageneric relationships of Xanthomonas species and Stenotrophomonas maltophilia (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 151 (1997), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The nearly complete, PCR-amplified, 16S rRNA gene sequences have been determined from the representative type strains of eight xanthomonad phena, including six validly described species of the genus Xanthomonas and Stenotrophomonas maltophilia. Pairwise sequence comparisons and phylogenetic analysis demonstrated that the xanthomonads comprise a monophyletic lineage within the γ-subclass of the Proteobacteria. Although the genus Xanthomonas was observed to comprise a cluster of very closely related species, the observed species-specific primary sequence differences were confirmed through sequencing additional strains belonging to the respective species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1997.tb12563.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Classification of all putative permeases and other membrane plurispanners of the major facilitator superfamily encoded by the complete genome of Saccharomyces cerevisiae (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology reviews 21 (1997), S. 0 
    Details
    ISSN: 1574-6976
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: On the basis of the complete genome sequence of the budding yeast Saccharomyces cerevisiae, a computer-aided analysis was carried out of all members of the major facilitator superfamily (MFS), which typically consists of permeases with 12 transmembrane spans. Analysis of all 5885 predicted open reading frames identified 186 potential MFS proteins. Binary sequence comparison made it possible to cluster 149 of them into 23 families. Putative permease functions could be assigned to 12 families, the largest including sugar, amino acid, and multidrug transport. Phylogenetic clustering of proteins allowed us to predict a possible permease function for a total of 119 proteins. Multiple sequence alignments were made for all families, and evolutionary trees were constructed for families with at least four members. The latter resulted in the identification of 21 subclusters with presumably tightly related permease function. No functional clues were predicted for a total of 41 clustered or unclustered proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6976.1997.tb00347.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Erratum to “16S rRNA gene sequence analyses and inter- and intrageneric relationships of Xanthomonas species and Stenotrophomonas maltophilia” (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 155 (1997), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1997.tb13883.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Complete Large Subunit Ribosomal RNA Sequences from the Heterokont Algae Ochromonas danica, Nannochloropsis salina, and Tribonema aequale, and Phylogenetic Analysis (1997)
    Springer
    Journal of molecular evolution 45 (1997), S. 84 -90 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Heterokonta — Stramenopiles — Algae — Eustigmatophytes — Xanthophytes — Chrysophytes — rRNA phylogeny —Nannochloropsis salina—Tribonema aequale—Ochromonas danica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The large subunit ribosomal RNA sequences from the heterokont algae Ochromonas danica, Nannochloropsis salina, and Tribonema aequale were determined. These sequences were combined with small subunit ribosomal RNA sequences in order to carry out a phylogenetic analysis based on neighbor-joining, maximum parsimony, and maximum likelihood methods. Our results indicate that heterokont fungi and heterokont algae each are monophyletic, and confirm that they together form a monophyletic group called ``stramenopiles.'' Within the heterokont algae, the eustigmatophyte Nannochloropsis salina either clusters with the chrysophyte Ochromonas danica or forms a sister group to a cluster comprising the phaeophyte Scytosiphon lomentaria and the xanthophyte Tribonema aequale. The alveolates were identified as the closest relatives of the stramenopiles, but the exact order of divergence between the eukaryotic crown taxa could not be established with confidence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006205
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Large-subunit rRNA sequence of the chytridiomyceteBlastocladiella emersonii, and implications for the evolution of zoosporic fungi (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 476-483 
    Details
    ISSN: 1432-1432
    Keywords: Chytridiomycetes ; Stramenopiles ; Alveolates ; Fungi ; Mastigomycetes ; rRNA phylogeny ; Blastocladiella emersonii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The 5.8S and 28S ribosomal RNA sequences of the chytridiomyceteBlastocladiella emersonii were determined. These data were combined with 18S rRNA sequences in order to carry out a phylogenetic analysis based on distance matrix, parsimony, and maximum likelihood methods. The new data confirmed that chytridiomycetes are true fungi and not protists, as was already suggested on the basis of biochemical, ultrastructural, and 18S rRNA data. Within the fungal clade,B. emersonii formed the first line of divergence. The position of the fungi within the eukaryotic “crown” taxa was also reassessed, and the alveolate-stramenopile cluster appeared as their sister group. The stramenopiles also comprise a number of zoosporic fungi, which resemble chytridiomycetes in so many respects, e.g., production of motile spores, thallus morphology, and absorptive nutrition, that they have been classified together with them in the past. This suggests that the possible common ancestor of the fungi, stramenopiles, and alveolates may have been a zoosporic fungus, which would mean that zoosporic fungi are paraphyletic instead of polyphyletic as previously suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02337520
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The 5S ribosomal RNA sequences of a red algal rhodoplast and a gymnosperm chloroplast. Implications for the evolution of plastids and cyanobacteria (1988)
    Springer
    Journal of molecular evolution 27 (1988), S. 126-132 
    Details
    ISSN: 1432-1432
    Keywords: Rhodoplast ; Chloroplast ; Plastid ; Endosymbiosis ; 5S ribosomal RNA ; Nucleotide sequence ; Secondary structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The 5S ribosomal RNA sequences have been determined for the rhodoplast of the red algaPorphyra umbilicalis and the chloroplast of the coniferJuniperus media. The 5S RNA sequence of theVicia faba chloroplast is corrected with respect to a previous report. A survey of the known sequences and secondary structures of 5S RNAs from plastids and cyanobacteria shows a close structural similarity between all 5S RNAs from land plant chloroplasts. The algal plastid 5S RNAs on the other hand show much more structural diversity and have certain structural features in common with bacterial 5S RNAs. A dendrogram constructed from the aligned sequences by a clustering algorithm points to a common ancestor for the present-living cyanobacteria and the land plant plastids. However, the algal plastids branch off at an early stage within the plastid-cyanobacteria cluster, before the divergence between cyanobacteria and land plant chloroplasts. This evolutionary picture points to the occurrence of multiple endosymbiotic events, with the ancestors of the present algal plastids already established as photosynthetic endosymbionts at a time when the ancestors of the present land plant chloroplasts were still free-living cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138372
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Large-Subunit rRNA Sequence of the Chytridiomycete Blastocladiella emersonii, and Implications for the Evolution of Zoosporic Fungi (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 476-483 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Chytridiomycetes — Stramenopiles — Alveolates — Fungi — Mastigomycetes — rRNA phylogeny —Blastocladiella emersonii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The 5.8S and 28S ribosomal RNA sequences of the chytridiomycete Blastocladiella emersonii were determined. These data were combined with 18S rRNA sequences in order to carry out a phylogenetic analysis based on distance matrix, parsimony, and maximum likelihood methods. The new data confirmed that chytridiomycetes are true fungi and not protists, as was already suggested on the basis of biochemical, ultrastructural, and 18S rRNA data. Within the fungal clade, B. emersonii formed the first line of divergence. The position of the fungi within the eukaryotic ``crown'' taxa was also reassessed, and the alveolate-stramenopile cluster appeared as their sister group. The stramenopiles also comprise a number of zoosporic fungi, which resemble chytridiomycetes in so many respects, e.g., production of motile spores, thallus morphology, and absorptive nutrition, that they have been classified together with them in the past. This suggests that the possible common ancestor of the fungi, stramenopiles, and alveolates may have been a zoosporic fungus, which would mean that zoosporic fungi are paraphyletic instead of polyphyletic as previously suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006109
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Evolutionary Relationships Among the Eukaryotic Crown Taxa Taking into Account Site-to-Site Rate Variation in 18S rRNA (1997)
    Springer
    Journal of molecular evolution 45 (1997), S. 619-630 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Eukaryotic crown taxa — 18S rRNA — Substitution rate calibration — Evolutionary distance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. In this study we constructed a bootstrapped distance tree of 500 small subunit ribosomal RNA sequences from organisms belonging to the so-called crown of eukaryote evolution. Taking into account the substitution rate of the individual nucleotides of the rRNA sequence alignment, our results suggest that (1) animals, true fungi, and choanoflagellates share a common origin: The branch joining these taxa is highly supported by bootstrap analysis (bootstrap support [BS] 〉 90%), (2) stramenopiles and alveolates are sister groups (BS = 75%), (3) within the alveolates, dinoflagellates and apicomplexans share a common ancestor BS 〉 95%), while in turn they both share a common origin with the ciliates (BS 〉 80%), and (4) within the stramenopiles, heterokont algae, hyphochytriomycetes, and oomycetes form a monophyletic grouping well supported by bootstrap analysis (BS 〉 85%), preceded by the well-supported successive divergence of labyrinthulomycetes and bicosoecids. On the other hand, many evolutionary relationships between crown taxa are still obscure on the basis of 18S rRNA. The branching order between the animal-fungal-choanoflagellates clade and the chlorobionts, the alveolates and stramenopiles, red algae, and several smaller groups of organisms remains largely unresolved. When among-site rate variation is not considered, the inferred tree topologies are inferior to those where the substitution rate spectrum for the 18S rRNA is taken into account. This is primarily indicated by the erroneous branching of fast-evolving sequences. Moreover, when different substitution rates among sites are not considered, the animals no longer appear as a monophyletic grouping in most distance trees.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006266
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...