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  • 1
    Electronic Resource
    Electronic Resource
    On compositions of analytic self-mappings of a convex domain (1990)
    Springer
    Archiv der Mathematik 55 (1990), S. 380-386 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01198477
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  • 2
    Electronic Resource
    Electronic Resource
    Ecological and evolutionary implications of digestive processes: Bird preferences and the sugar constituents of floral nectar and fruit pulp (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 544-551 
    Details
    ISSN: 1420-9071
    Keywords: Bird feeding preferences ; digestion ; intestinal enzymes ; sucrase ; fruit ; nectar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Plants pollinated and dispersed by different groups of birds offer different kinds of sugars in nectar and fruit pulp. The preferences and physiological traits of avian pollinators and seed dispersers are broadly correlated with the sugar composition of the nectar and fruit that they feed on and appear to have influenced the evolution of the sugar composition of the rewards that plants offer. Hummingbirds prefer sucrose whereas many nectar- and fruit-eating passerines prefer glucose and fructose. Preference for hexoses in passerines seems to be associated with poor sucrose assimilation resulting from two physiological mechanisms: lack of intestinal sucrase activity and fast passage rates. Sucrase activity absence appears to be restricted to a single phylogenetic group (the sturnid-muscicapid lineage). Fast passage rates seem to be characteristic of many small frugivores and to hinder the assimilation of complex nutrients that require hydrolysis before absorption. Hummingbirds have extremely specialized digestive traits that allow them to assimilate sucrose at high rates and with extremely high efficiency. These specialized digestive traits appear not to be present in many nectar-feeding passerines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920237
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  • 3
    Electronic Resource
    Electronic Resource
    The microstructure of extruded Fe-Al (1989)
    Springer
    Journal of materials science 24 (1989), S. 4246-4252 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Five FeAl alloys, whose compositions span the range 34 to 51 at. % Al, were extruded at 1273 K, re-extruded at 1023 K and their deformation structures examined by transmission electron microscopy. The incidence of 〈1 1 1〉 slip, compared with 〈001〉 slip, was found to increase as Fe-Al became more iron-rich, confirming previous results, in a similar study: some of the 〈1 1 1〉 dislocations were found to be present in the form of dipoles. In the most aluminium-rich alloy square 〈0 0 1〉 prismatic dislocation loops, planar defects and FeAl2 particles were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544494
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  • 4
    Electronic Resource
    Electronic Resource
    Dislocations and grain boundaries in polycrystalline ice: a preliminary study by synchrotron X-ray topography (1992)
    Springer
    Journal of materials science 27 (1992), S. 2719-2725 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract White-beam synchrotron X-ray topography has been used to image dislocations and grain boundaries in high-purity columnar-grained polycrystalline ice. It was found that screw, 30° and 60° basal dislocations with 〈 1 1 ¯2 0 〉 Burgers vectors far outnumber other dislocations: near free surfaces, the dislocations were bent because of image forces. Circular prismatic dislocation loops with [0 0 0 1] Burgers vectors and dipoles were also found. These probably formed due to thermal shock. In one sample, the dislocation structures of three grains were clearly observed simultaneously, although no dislocations were visible in the boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540695
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  • 5
    Electronic Resource
    Electronic Resource
    The structure of consolidated rapidly solidified powders of Ni3Al (1986)
    Springer
    Journal of materials science 21 (1986), S. 3297-3301 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Rapidly solidified powders of stoichiometric Ni3Al and Ni3Al containing boron and titanium have each been consolidated by two distinct routes, namely hot extrusion or hot compaction. The resulting microstructures have been examined by optical microscopy, scanning electron microscopy and transmission electron microscopy. The consolidated material did not retain the non-equilibrium structure of the rapidly solidified powders. The addition of titanium and boron produced material with a larger final grain size, a decreased incidence of twinning and, in the extruded material, led to cracking. Although all processing was performed in inert atmospheres, oxides were present in all consolidated products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553373
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  • 6
    Electronic Resource
    Electronic Resource
    Room-temperature deformation of PdIn (1991)
    Springer
    Journal of materials science 26 (1991), S. 4303-4306 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Room temperature tensile testing of the B2-structured compound Pd-52 at% In produced, a yield strength of 50 MPa, a fracture strength of 130 MPa, and limited tensile ductility (∼3%). Examination, in the transmission electron microscope, of the deformed microstructure indicated that it deforms by 〈001〉 {100} slip. Extra reflections and streaking were observed in selected area electron diffraction patterns, which appear to be a thin foil effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543642
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  • 7
    Electronic Resource
    Electronic Resource
    Room temperature deformation modes in DO3-structured Fe-34AI and Fe-28AI-6Cr (1993)
    Springer
    Journal of materials science 28 (1993), S. 2299-2303 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dislocation substructures in the DO3-structured alloys, Fe-34AI and Fe-28AI-6Cr, were examined by transmission electron microscopy following room temperature compression. In both alloys a small number of a〈001〉 dislocations, produced through the energetically favourable interaction of two pairs of antiphase boundary-coupled a/2〈1 1 1〉 dislocations, was observed. It was also found that, relative to the binary alloy, one effect of the chromium addition was to increase the B2 character of the alloy, but conversely to decrease the DO3 character. These results are rationalized on the basis of the atom site location of the chromium atoms in the DO3 structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151656
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  • 8
    Electronic Resource
    Electronic Resource
    The occurrence and significance of amino acids in floral nectar (1986)
    Springer
    Plant systematics and evolution 151 (1986), S. 175-186 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms. — Nectar ; amino acids ; pollinators ; sample size ; phylogenetic constraint ; evolutionary significance. — Flora of California
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Approximately 1 500 angiosperm species, in previous papers, have been sampled for the assessment of the amino acids (a. a.) in their nectar. We reaffirm that the findings provide statistically significant data linking differences in the concentration with pollinator type. Flowers that are pollinated by animals that have alternative sources of protein-building a. a.’s show lower a. a. concentration than those that are not. There is a tendency for woody plant nectar a. a.’s to be less concentrated than those of herbaceous plants, but there can be “phylogenetic constraints” which may reduce the correlations of a. a. concentration with pollinator type and with life form. The individual a. a.’s form complements which are qualitatively extremely constant within species. Proline is a normal constituent of many nectars and does not necessarily indicate contamination of the nectar by pollen. Criticism of our findings byGottsberger & al. (1984) is answered by reference to our previous publications and those of other workers, and to the presentation of data from California native species, not published previously. All previous postulates are borne out by these new data with the exception of positive correlations of a. a. concentration with “primitive” and “advanced” floral characteristics taken one at a time, which appear to be inconsistent and are affected strongly by the nature of the family in which they occur. Summary data are provided for families and genera which indicate that high or low a. a. concentration can typify certain families and genera of both relatively “primitive” and relatively “advanced” nature. Needs for future research on an ecosystem basis are quoted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02430273
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  • 9
    Electronic Resource
    Electronic Resource
    Pollination-related characteristics in the mimosoid legumeAcacia terminalis (Leguminosae) (1987)
    Springer
    Plant systematics and evolution 157 (1987), S. 49-62 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Leguminosae ; Mimosoideae ; Acacia terminalis ; Bee- and bird-pollination ; extrafloral nectaries ; intraspecific variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intraspecific variation has been found for several pollination-related characteristics in two isolated populations of the self-incompatible treeAcacia terminalis: floral characteristics including colour and flowering time; style length; size and colour of extrafloral nectaries on the leaf petioles; chemical components of the extrafloral nectar; different taxa of bee pollinators; and frequency differences in bird pollinators. These differences possibly reflect the evolution of two different pollination syndromes within this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939180
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  • 10
    Electronic Resource
    Electronic Resource
    Short communication: Induced ovulation of sablefish (Anoplopoma fimbria) following oral administration of des Gly10-(D-Ala6)LH-RH ethylamide (1990)
    Springer
    Fish physiology and biochemistry 8 (1990), S. 497-499 
    Details
    ISSN: 1573-5168
    Keywords: sablefish ; Anoplopoma fimbria ; gonadotropin-releasing hormone ; LHRH analogue ; oral intubation ; induced maturation ; polypeptide absorption ; polypeptide protection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00003406
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