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  • 1
    Digitale Medien
    Digitale Medien
    Differentiation of fourHordeum sect.Stenostachys spp. (Poaceae: Triticeae) using multivariate morphometrics (1989)
    Springer
    Plant systematics and evolution 166 (1989), S. 211-223 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Poaceae ; Triticeae ; Hordeum brachyantherum ; H. californicum ; H. capense ; H. secalinum ; Morphometrics ; cluster analysis ; classificatory discriminant analysis ; canonical analysis ; sheared principal component analysis ; bootstrap validation ; identification key
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Field collections and 296 herbarium sheets were examined for 27 morphometric variables. A priori species identifcation was based on geographical distribution except forH. californicum, a diploid species primarily occurring in California and differing from the much more widespread tetraploidH. brachyantherum that thrives in N. America and N.E. Asia;H. capense grows in S. Africa andH. secalinum mainly in Europe. Various cluster analyses were used followed by cluster recovery verification. Classificatory discriminant analysis and validation by the bootstrap yielded 85–90% overall total correct classification of the four species. Canonical analysis revealed thatH. californicum occupies an intermediate phenetic position among the other three distinct species. Factors of shape differences were unravelled and portrayed by shearing. A revised key to species was drawn up.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00935950
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  • 2
    Digitale Medien
    Digitale Medien
    The 5S DNA units of bread wheat (Triticum aestivum) (1992)
    Springer
    Plant systematics and evolution 183 (1992), S. 183-194 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Poaceae ; Triticum aestivum ; 5S DNA sequences ; chromosomal5S Dna loci ; wheat evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A collection of 44 cloned 5S DNA units fromTriticum aestivum cv. ‘Chinese Spring’ were grouped into 12 sequence-types based on sequence similarity and the respective consensus sequences were then produced. The relationship between these 12 consensus sequences (T. aestivum S 1-S 8 andT. aestivum L 1-L 4), together with two clones sequenced byGerlach andDyer, and the 5S DNA consensus sequences from diploidTriticum spp. were then determined by numerical methods. Both phenetic and cladistic analyses were carried out. The following wheat 5S DNA sequences were found to group with respective sequences from diploidTriticum spp.:T. aestivum S 4, S 6 withT. tauschii S;T. aestivum S 3 withT. monococcum S andT. monococcum S-Rus 7;T. aestivum L 1 andT. aestivum L-G&D withT. speltoides L;T. aestivum L 2, L 3 withT. tauschii L;T. aestivum L 4 withT. monococcum L andT. monococcum L-Rus 12. The analyses suggested that 5 out of the 65S Dna loci present in wheat were identified at the sequence level. The locus that could not be identified in this analysis was the5S Dna-B 1 locus. A group ofT. aestivum sequences (T. aestivum S 1, S 7, S 8, S-G&D) were found to be distinct from the other 5S DNA sequences in the data base. The existence of the distinct group of 5S DNA sequences suggests that there is a gap in our current understanding of wheat evolution with respect to the5S Dna loci.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00940802
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  • 3
    Digitale Medien
    Digitale Medien
    Evolutionary change at the5S Dna loci of species in theTriticeae (1992)
    Springer
    Plant systematics and evolution 183 (1992), S. 195-208 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Poaceae ; Triticeae ; 5S DNA ; spacer ; phylogenetic inference
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Previous studies have shown that two separate loci for 5S DNA sequences may exist within a species. Two size classes have been tentatively assigned in the ranges 327–468 bp (chromosome 1), and 469–500 bp (chromosome 5) and the entire data-base was subjected to various numerical taxonomic analyses. The results confirm the existence of two lineages of 5S DNA sequences represented by the two size classes.Hordeum vulgare is separate from the species known also asCritesion and, together withDasypyrum, occupy an intermediate position between the two size classes. The 5S DNA units fromTriticum spp. that have also been namedAegilops spp. in other classifications appear as a distinct group withinTriticum spp. at both loci. The consensus 5S DNA sequence fromPsathyrostachys is remote fromHordeum s.l. in contrast to opinions based on morphology. Other aspects are detailed and discussed, including the inadequacy of the computing methods used as well as the need for more data in view of the large amount of homoplasy. The merit of using the spacer for phylogenetic inference is also discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00940803
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  • 4
    Digitale Medien
    Digitale Medien
    Relationships betweenOryza species (Poaceae) based on 5S DNA sequences (1992)
    Springer
    Plant systematics and evolution 183 (1992), S. 249-264 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Poaceae ; Oryza ; 5S DNA ; phylogeny ; evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Relationships between 9Oryza species, covering 6 different genomes, have been studied using hybridization and nucleotide sequence information from the5S Dna locus. Four to five units of the major size class of 5S DNA in each species, 55 units in all, were cloned and sequenced. Both hybridization and sequence data confirmed the basic differences between the A and B, C, D genome species suggested by morphological and cytological data. The 5S DNA units of the A genome species were very similar, as were the ones from the B, C, and D genome-containing species. The 5S DNA ofO. australiensis (E genome) grouped with the B, C, D cluster, while the units ofO. brachyantha (F genome) were quite different and grouped away from all other species. 5S DNA units fromO. minuta, O. latifolia, O. australiensis, andO. brachyantha hybridized strongly, and preferentially, to the genomic DNA from which the units were isolated and hence could be useful as species/genome specific probes. The 5S DNA units fromO. sativa, O. nivara, andO. rufipogon provided A genome-specific probes as they hybridized preferentially to A genome DNA. The units fromO. punctata andO. officinalis displayed weaker preferential hybridization toO. punctata DNA, possibly reflecting their shared genome (C genome).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00940807
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  • 5
    Digitale Medien
    Digitale Medien
    Taxonomic separation ofKengyilia (Poaceae: Triticeae) in relation to nearest relatedRoegneria, Elymus, andAgropyron, based on some morphological characters (1995)
    Springer
    Plant systematics and evolution 194 (1995), S. 123-132 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Poaceae ; Triticeae ; Kengyilia ; Multivariate analysis ; generic limits
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Based on 100 species representative of the four genera, we scored 290 herbarium specimens for a number of morphological characters. The data were subjected to canonical discriminant analysis using characters different from those in the identification key to these genera byBaum, Yen, andYang (1991). These characters collectively support the four groupsAgropyron, Kengyilia, Roegneria, andElymus as previously defined. The four groups are also supported by the linear discriminant function with an overall rate of 83% correct classification. Length of lemma awn was found to be an additional diagnostic character asAgropyron andKengyilia have lemma awns shorter than 5 mm, whereasRoegneria andElymus have longer lemma awns with very few exceptions. Length of glume awns is also a useful supplementary generic diagnostic.Agropyron andElymus have glume awns, whereas the majority of species ofKengyilia and more than half of the species ofRoegneria lack them. If a glume awn is present it is usually not longer than 1 mm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00982851
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  • 6
    Digitale Medien
    Digitale Medien
    Ribosomal DNA spacer-length variation inSecale spp. (Poaceae) (1990)
    Springer
    Plant systematics and evolution 171 (1990), S. 205-220 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Poaceae ; Secale ; Ribosomal DNA ; spacer subrepeats ; restriction fragment length polymorphism (RFLP) ; phenetic relationships
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Variation in ribosomal DNA spacer length was analysed in 23 populations of 12Secale spp. by restriction enzyme analysis. Digestion of rDNA with Taq I endonuclease enzyme yields spacer fragments that include the subrepeat array and the non-repetitive region downstream of the array. Extensive spacer length variation existed in most species with Taq I fragment lengths ranging from 0.9–3.1 kb. These length variants have been attributed to the differences in number of 134 bp spacer subrepeats within rDNA arrays.S. silvestre was the only species to exhibit a unique spacer length variant of 0.9 kb and this was shown to result from the presence of an extra Taq I site in the spacer. rDNA spacer length frequencies were determined for the species. These frequencies were used to derive phenetic relationships between the species by numerical taxonomic methods. In plots constructed fromGower's distance matrices,S. silvestre appeared well separated from the major cluster consisting of the other species. On the basis of morphological and cytogenetic criteria,S. silvestre is considered the most ancient species. The rDNA data is consistent with this interpretation as it shows a clear differentiation ofS. silvestre from all the other species based on length and nucleotide sequence composition of the spacer region.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00940606
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  • 7
    Digitale Medien
    Digitale Medien
    Kengyilia habahenensis (Poaceae: Triticeae) — a new species from the Altai mountains, China (1991)
    Springer
    Plant systematics and evolution 174 (1991), S. 103-108 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Angiosperms ; Poaceae ; Triticeae ; Kengyilia habahenensis ; spec. nova ; Taxonomy ; genome analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Kengyilia habahenensis, spec. nova, from the Altai mountains, China, is described morphologically and cytologically. It has 2n = 42 chromosomes, and the genome formula PYS.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00937698
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  • 8
    Digitale Medien
    Digitale Medien
    Taxonomy ofHordeum caespitosum, H. jubatum, andH. lechleri (Poaceae: Triticeae) (1994)
    Springer
    Plant systematics and evolution 190 (1994), S. 97-111 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Poaceae ; Hordeum ; Taxonomy ; logistic discrimination ; bootstrap validation ; multivariate analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Hordeum caespitosum Scribner,H. jubatum L., andH. lechleri (Steudel)Schenck are very similar in appearance and therefore until recently were mostly not recognized as separate entities. The first two are tetraploid and natives to North America, but the second occurs naturally in eastern Siberia and has been introduced in Europe and South America and may become a cosmopolitan weed. The third is hexaploid and South American. This study analyses their morphological diversity by means of selected multivariate techniques in order to determine if there is justification to recognize them as three separate morphological species. Logistic discrimination, although based on a reduced set of characters, yielded the highest percent of correct assignments. A linear discriminant function is provided and validated by 100 bootstrap repeats. Canonical discriminant analysis indicated three groups. It is subsequently concluded that the three are separate morphological species. Although a linear discriminant function is given, a traditional identification key is provided based on the palea length and triad (the group of three spikelets at each rachis node) length.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00937861
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  • 9
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    Murine leukemia induced by retroviral gene marking (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2002-04-20
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, Zhixiong -- Dullmann, Jochen -- Schiedlmeier, Bernd -- Schmidt, Manfred -- von Kalle, Christof -- Meyer, Johann -- Forster, Martin -- Stocking, Carol -- Wahlers, Anke -- Frank, Oliver -- Ostertag, Wolfram -- Kuhlcke, Klaus -- Eckert, Hans-Georg -- Fehse, Boris -- Baum, Christopher -- New York, N.Y. -- Science. 2002 Apr 19;296(5567):497.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Heinrich-Pette-Institute, D-20251 Hamburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11964471" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Bone Marrow Cells/metabolism ; Bone Marrow Transplantation ; DNA-Binding Proteins/genetics/metabolism ; *Gene Transfer, Horizontal ; Genetic Therapy ; *Genetic Vectors ; Hematopoiesis, Extramedullary ; Leukemia, Monocytic, Acute/*etiology ; Mice ; Mice, Inbred C57BL ; Preleukemia/*etiology ; *Proto-Oncogenes ; Receptor, Nerve Growth Factor ; Receptor, trkA/genetics/metabolism ; Receptors, Nerve Growth Factor/*genetics/metabolism ; Retroviridae/*genetics ; Transcription Factors/genetics ; Transgenes
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 10
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    Rebuilding global fisheries (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2009-08-01
    Beschreibung: After a long history of overexploitation, increasing efforts to restore marine ecosystems and rebuild fisheries are under way. Here, we analyze current trends from a fisheries and conservation perspective. In 5 of 10 well-studied ecosystems, the average exploitation rate has recently declined and is now at or below the rate predicted to achieve maximum sustainable yield for seven systems. Yet 63% of assessed fish stocks worldwide still require rebuilding, and even lower exploitation rates are needed to reverse the collapse of vulnerable species. Combined fisheries and conservation objectives can be achieved by merging diverse management actions, including catch restrictions, gear modification, and closed areas, depending on local context. Impacts of international fleets and the lack of alternatives to fishing complicate prospects for rebuilding fisheries in many poorer regions, highlighting the need for a global perspective on rebuilding marine resources.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Worm, Boris -- Hilborn, Ray -- Baum, Julia K -- Branch, Trevor A -- Collie, Jeremy S -- Costello, Christopher -- Fogarty, Michael J -- Fulton, Elizabeth A -- Hutchings, Jeffrey A -- Jennings, Simon -- Jensen, Olaf P -- Lotze, Heike K -- Mace, Pamela M -- McClanahan, Tim R -- Minto, Coilin -- Palumbi, Stephen R -- Parma, Ana M -- Ricard, Daniel -- Rosenberg, Andrew A -- Watson, Reg -- Zeller, Dirk -- New York, N.Y. -- Science. 2009 Jul 31;325(5940):578-85. doi: 10.1126/science.1173146.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biology Department, Dalhousie University, Halifax, NS B3H 4J1, Canada. bworm@dal.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19644114" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biodiversity ; Biomass ; *Conservation of Natural Resources ; *Ecosystem ; *Fisheries/methods ; *Fishes/anatomy & histology ; Internationality ; Marine Biology ; Models, Biological ; Oceans and Seas ; Population Dynamics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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