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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Fillers on Wet Compressive Creep of Cellulose Acetate (1970)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 9 (1970), S. 172-175 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i360034a010
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  • 2
    Electronic Resource
    Electronic Resource
    Reverse Osmosis Membranes with Improved Compaction Resistance (1972)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 11 (1972), S. 195-199 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i360042a014
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  • 3
    Electronic Resource
    Electronic Resource
    Book reviews (1987)
    Springer
    Journal of classification 4 (1987), S. 111-141 
    Details
    ISSN: 1432-1343
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01890079
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  • 4
    Electronic Resource
    Electronic Resource
    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
    Keywords: 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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935950
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  • 5
    Electronic Resource
    Electronic Resource
    A new species ofTamarix from south-eastern Iran (1967)
    Springer
    Plant systematics and evolution 114 (1967), S. 379-382 
    Details
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373098
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  • 6
    Electronic Resource
    Electronic Resource
    Theory and practice of botanical classification: Cladistics, phenetics and classical approaches—critical summary: Botanical systematics in 1987 (1989)
    Springer
    Plant systematics and evolution 166 (1989), S. 197-210 
    Details
    ISSN: 1615-6110
    Keywords: Botanical classification ; phylogenetic models ; phenetics ; cladistics ; systematics ; evolution ; computer packages
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aristotelian principles still dominate botanical classification. Biological classification has undergone a major transformation during the period fromAdanson (1763) toDarwin (1859), from essentialism and the practice of downward classification, to empiricism and upward classification. The polythetic class was conceptualized during the 1950s. Interest in the species problem generated data from many different disciplines, the most recent being DNA systematics. These many disciplines have contributed to our understanding of evolutionary processes and to improved classifications. Many different phylogenetic models were developed and for different kinds of data. These models formed the basis of many algorithms to infer phylogenetic trees, some widely available in computer packages. This became possible with rapid growth of computer technology. These developments in turn catalyzed the formulation of divergent philosophical principles and approaches to classification. For instance, should methodological principles be divorced from knowledge about evolutionary processes? These approaches are discussed along with problems of reticulate evolution, intra-OTU-variation, homology, and other issues in the light of existing methodologies and their impact on classification. The next important direction in addition to development of new classificatory algorithms is the synthesis of various elements of different methodologies presently used in isolation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935949
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  • 7
    Electronic Resource
    Electronic Resource
    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
    Keywords: Poaceae ; Triticeae ; Kengyilia ; Multivariate analysis ; generic limits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00982851
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  • 8
    Electronic Resource
    Electronic Resource
    Taxonomy ofHordeum caespitosum, H. jubatum, andH. lechleri (Poaceae: Triticeae) (1994)
    Springer
    Plant systematics and evolution 190 (1994), S. 97-111 
    Details
    ISSN: 1615-6110
    Keywords: Poaceae ; Hordeum ; Taxonomy ; logistic discrimination ; bootstrap validation ; multivariate analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937861
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  • 9
    Electronic Resource
    Electronic Resource
    Genetic diversity in wild barley (Hordeum spontaneum C. Koch) in the Near East: a molecular analysis using Random Amplified Polymorphic DNA (RAPD) markers (1997)
    Springer
    Genetic resources and crop evolution 44 (1997), S. 147-157 
    Details
    ISSN: 1573-5109
    Keywords: Genetic polymorphism ; wild barley ; Hordeum spontaneum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract We analyzed the genetic diversity in 88 genotypes from 20 populations of wild barley (Hordeum spontaneum C. Koch) from Israel, Turkey and Iran, by randomly amplified polymorphic DNA (RAPD). Twenty two of the 33 primers used yielded scorable products with 1–11 polymorphic bands. No duplicate patterns were found except for four haplotypes.When the total genetic diversity was estimated, 75% of the variation detected was partitioned within the 88 genotypes and 25% among the populations. When variation between countries was assessed, no substantial differences were found, because most of the variation detected (97%) was partioned within the 20 populations and the remainder among countries. The results of this limited survey indicate that the extensive genetic diversity is present in natural stands of wild barley throughout the Fertile Crescent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008655023906
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  • 10
    Electronic Resource
    Electronic Resource
    Ecological correlates of RAPD DNA diversity of wild barley, Hordeum spontaneum, in the Fertile Crescent (1998)
    Springer
    Genetic resources and crop evolution 45 (1998), S. 151-159 
    Details
    ISSN: 1573-5109
    Keywords: genetic diversity ; ecological diversity ; stress ; Near East ; wild barley
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Genetic variability in RAPDs (Randomly Amplified Polymorphic DNA) was studied in 104 genotypes of wild barley, Hordeum spontaneum from 21 populations sampled in Israel, Turkey and Iran, seven population from each country. The band (= loci) frequencies were calculated for each population and correlated with ecogeographical variables. In general, high RAPD genetic diversity indices were associated with stressful environments, either with hot or cold steppes and deserts. Interpopulational genetic distances showed no association with the geographic distance between the populations' provenance. Significant Spearman rank correlations between RAPD band frequencies and ecogeographical parameters of provenance occured. Frequencies of RAPD bands were significantly correlated with the principal component factors of allozymes. The correlation data indirectly suggest that natural selection appears to be the major determinant of both RAPD and allozyme diversities both being correlated with environmental stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008616923427
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