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  • crystal structure
  • evolution
  • porous silicon
  • Springer  (24)
  • 2000-2004
  • 1985-1989  (24)
  • 1985  (24)
Collection
Keywords
Publisher
Years
  • 2000-2004
  • 1985-1989  (24)
Year
  • 1
    Electronic Resource
    Electronic Resource
    On the physical crosslinking of amine-extended polyurethane urea elastomers: A crystallographic analysis of bis-urea from diphenyl methane-4-isocyanate and 1,4-butane diamine (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 335-341 
    Details
    ISSN: 1435-1536
    Keywords: Polyurethane elastomers ; hard segment ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The substance under investigation is taken as a model for hard segments consisting of MDI 1) and 1,4-butane diamine. It crystallizes in the triclinic space group P¯1 witha=4.6297;b=5.8259;c=25.286 Å;α=90.721;β=91.580;γ=102.90 degrees andZ=1. Bond distances and angles are given, together with some data on the conformation. The most significant finding is that neighbouring molecules in one and the same plane are linked to one another by means of bifurcated hydrogen bonds. A comparison with the corresponding data for an analogous bis-urethane provides a plausible explanation of the main differences between diamine and glycol extension in polyurethane elastomers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412250
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  • 2
    Electronic Resource
    Electronic Resource
    Creativity in biology and in the human mind (Manifestation of Concepts) (1985)
    Springer
    Acta biotheoretica 34 (1985), S. 3-51 
    Details
    ISSN: 1572-8358
    Keywords: anthropic principle ; creativity ; evolution ; insight ; manifestation ; mental creativity ; organismal creativity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00418105
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  • 3
    Electronic Resource
    Electronic Resource
    Systematics and evolution of holarctic Pierinae (Lepidoptera). An enzyme electrophoretic approach (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 24-29 
    Details
    ISSN: 1420-9071
    Keywords: Pieridae ; Lepidoptera ; systematics ; evolution ; enzyme electrophoresis ; genetic differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Enzyme electrophoretic data show a remarkably high degree of genetic similarity within the European group ofnapi s.l. whereas genetic differences exist at several loci between the European and the North American taxa ofnapi s.l. It is concluded that the European taxa did not differentiate to the species level and form a phylogenetically young group. The North American taxa included in this study are specifically distinct from Europeannapi and separated much earlier. Within these North American taxamarginalis, oleracea andvirginiensis did undergo speciation. The data show a splitting of the genusPieris into three species groups, each genetically differentiated to the same level. The splitting ofPieris into two genera, as suggested by earlier investigators, is not supported here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02005856
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  • 4
    Electronic Resource
    Electronic Resource
    The evolution of sex and the role of sex in evolution (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1231-1235 
    Details
    ISSN: 1420-9071
    Keywords: Sex ; recombination ; evolution ; parasites ; the Tangled Bank ; the Red Queen ; sex-allocation ; sexual selection ; sex determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952065
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  • 5
    Electronic Resource
    Electronic Resource
    Two theories of sex and variation (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1235-1245 
    Details
    ISSN: 1420-9071
    Keywords: Sex ; evolution ; the Tangled Bank ; the Red Queen ; recombination experiments ; genotype × environment interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952066
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  • 6
    Electronic Resource
    Electronic Resource
    Structural characteristics of the mammalian spleen indicating storage and release of red blood cells. Aspects of evolutionary and environmental demands (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 159-163 
    Details
    ISSN: 1420-9071
    Keywords: Spleen ; red pulp ; storage ; release ; morphology ; evolution ; structural characteristics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02002608
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  • 7
    Electronic Resource
    Electronic Resource
    On the evolution of the spleen (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 145-152 
    Details
    ISSN: 1420-9071
    Keywords: Spleen ; evolution ; phylogeny ; ontogeny ; non-mammalian spleen ; mammalian spleen ; comparative macromorphology ; comparative micromorphology ; intralienal vessels ; extralienal vessels ; differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02002606
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  • 8
    Electronic Resource
    Electronic Resource
    Sex determining mechanisms: An evolutionary perspective (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1285-1296 
    Details
    ISSN: 1420-9071
    Keywords: Sex ; sex determination ; sex ratio ; evolution ; animals ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Theories on the evolution of sex determining mechanisms are reviewed for male and female heterogamety, environmental sex determination, and briefly, haplo-diploidy and hermaphroditism. Because of their discrete and well-defined nature, sex determining mechanisms lend themselves to three types of evolutionary questions:what variety occurs and might be expected but does not occur,how do changes occur from one mechanism to another, andwhy do certain changes occur? All three approaches were illustrated for these different sex determining mechanisms. A generality emerging from these studies is that, at the level of selection on the sex ratio, there are no intrinsic problems in evolving from one sex determining mechanism to another: straightforward transitions between different mechanisms exist under various conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952071
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  • 9
    Electronic Resource
    Electronic Resource
    Phosphoglycerate mutase isozymes in the lower vertebrates (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1471-1472 
    Details
    ISSN: 1420-9071
    Keywords: Phosphoglycerate mutase isozymes ; evolution ; gene duplication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The phosphoglycerate mutase isozyme patterns from cyclostomata, cartilaginous and bony fish were analyzed. The observed patterns indicate that a duplication of a single ancestral gene coding for phosphoglycerate mutase took place during the evolution of the gnathostome vertebrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01950042
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  • 10
    Electronic Resource
    Electronic Resource
    Identification of the G-genome donor to Triticum timopheevii by DNA:DNA hybridizations (1985)
    Springer
    Biochemical genetics 23 (1985), S. 125-137 
    Details
    ISSN: 1573-4927
    Keywords: Triticum timopheevii ; Triticum speltoides ; G genome ; tetraploids ; evolution ; DNA hybridizations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In vitro DNA:DNA hybridizations and hydroxyapatite thermal-elution chromatography were employed to identify the diploid Triticum species ancestral to the G genome of Triticum timopheevii. Total genomic, unique-sequence, and repeated-sequence fractions of 3H-T. timopheevii DNA were hybridized to the corresponding fractions of unlabeled DNAs of T. searsii, T. speltoides, T. sharonensis, T. longissimum, and T. bicorne. The heteroduplex thermal stabilities indicated that, of the five species examined, T. speltoides was the most closely related to the G genome of T. timopheevii. Thus, T. spelotides appears to be the G-genome donor to T. timopheevii. The thermal stability profiles further indicated that the repeated DNA fractions from the five diploid species and the tetraploid T. timopheevii are more similar than the unique DNA fractions. This indicates that all of these species are closely related and that the sequences which comprise the current repeated fractions in the various species have not undergone any significant change since the formation of various species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00499118
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