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  • 1975-1979  (6)
  • 1970-1974  (2)
  • 1955-1959  (1)
  • 1950-1954  (1)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Design study of a time-of-flight small-angle diffractometer for a pulsed neutron source (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 464-465 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A design study was made of a neutron small-angle scattering (SAS) instrument for use at Argonne National Laboratory's proposed Intense Pulsed Neutron Source, IPNS-II (Carpenter & Werner, 1976; Werner, 1977; Carpenter, 1977). The instrument design incorporates several features: a converging-slit collimator, wavelength band-limiting choppers, capacity for large samples, and a two-dimensional detector. Machine design-dependent parameters are considered in a Monte-Carlo code that produces estimates of the instrumental resolution function and available flux at the sample. It was found that the calculated flux on sample exceeds that at steady-state reactor instruments of comparable resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188987801359X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A plea for hyphens (1977)
    [s.l.] : Nature Publishing Group
    Nature 267 (1977), S. 202-202 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR,-At the risk of sounding pedantic I want to make a plea for a return to the sound practice of writing a hyphen in compound words used adjectivally. Today's general practice of omitting the hyphen in such adjectives as 'hormone-induced' and 'temperature-sensitive' is sheer sloppiness and, more ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/267202d0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray diffraction study of Zr(Ca,Y)O2−x. I. The average structure (1979)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 789-795 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Integrated X-ray intensities of Bragg peaks were observed from single crystals of Zr0.866Ca0.134Ol.866 and Zr0.786Y0.214O1.893 in the disordered state. There are displacements of oxygen ions (characterized by Δ/a ̃0.05) from the ideal positions of the fluorite structure along (100) directions similar to those that occur on ordering below 1273 K and related to the cubic to tetragonal transition in pure ZrO2. These displacements are not related to anharmonicity, at least to fourth-order terms. In addition, there are small displacements of the cations (Δ/a ̃0.015) in (111) directions in the yttria-stabilized zirconia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739479001807
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Positional information in the amphibian limb (1976)
    Springer
    Acta biotheoretica 25 (1976), S. 44-65 
    Details
    ISSN: 1572-8358
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary (1) The concept of positional information is applied to a large amount of data obtained previously in experiments on developing and regenerating amphibian limbs. Only the proximo-distal axis of the limb is considered. It is shown that the concept provides a simple, unitary hypothesis which satisfactorily accounts for the experimental data, and may moreover suggest meaningful new approaches. (2) It is suggested that the boundaries of the bipolar limb system lie in the girdle skeleton and at the distal end of the limb, respectively, and that it is the apical epidermis of the growing or regenerating limb which defines the distal boundary conditions. A relatively stable gradient of positional information is assumed to be set up in the mesoderm (or mesenchyme). It is further shown that the differentiated limb retains its positional information and upon amputation imparts it to the base of the blastema. (3) To explain an apparent discrepancy between the developing and the regenerating limb, it is proposed that dedifferentiation of mesodermal limb tissues upon amputation entails a change of positional value in the mesenchyme. Consequently, the amputation level does not once and for all specify the positional value at the proximal end of a mass of blastemal mesenchyme, particularly when the mesenchyme is transplanted in such a way that its linear size decreases (regression) or increases (fusion of several blastemas).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02113740
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Shape: Its development and regulation capacity during embryogenesis (1978)
    Springer
    Acta biotheoretica 27 (1978), S. 185-200 
    Details
    ISSN: 1572-8358
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Although several theoretical approaches consider general methods for dealing with shape, recent observations and experimental data show that embryos exhibit marked changes in the properties of the biological material involved in shape development and shape regulation capacity. In vivo experiments have shown that the amphibian embryo gradually develops from a situation in which it is not able to maintain its shape to one in which it can not only maintain its shape but also possesses a maximal tolerance towards deformation together with a maximal shape regulation capacity. So far two especially clear conclusions have emerged: (i) the form of the embryo appears to be determined by cell activities intrinsic to each stage, and (ii) the morphogenetic programme can be executed normally within wide limits notwithstanding dramatic deformations of the embryo during quite a long period. Thus the hypothesis may be advanced that shape and morphogenesis to some extent become independent phenomena during embryonic development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115833
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Ethylenediamine Tetraacetate and the Intestinal Absorption of Vitamin B 12 (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 1395-1396 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In this communication results on the effect of ethylenediamine tetraacetate on the intestinal absorption of radioactive vitamin B12 by gastrectomized rats are presented. We preferred the use of animals in which the entire stomach had been resected because in this way a possible influence of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1831395a0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Morphogenesis of mesenchyme from regeneration blastemas in the absence of digit formation in ambystoma mexicanum (1971)
    Springer
    Development genes and evolution 168 (1971), S. 174-180 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. Undifferentiated fore limb blastemas were denuded of their epidermis and grafted to the flank musculature; each transplant consisted of four such blastemas. Outgrowth of the mesenchyme and subsequent digit formation were prevented by covering the transplants with whole flank skin with its dermis intact. 2. Notwithstanding the absence of digits, 26 out of the 36 differentiated transplants formed one or two oblong, stout cartilages resembling proximal skeletal elements of the limb. Considering that four blastemas had been grafted in random orientation, this indicates considerable intrinsic morphogenetic capacities of the blastemal mesenchyme in the absence of organizing influences of the epidermis. 3. Thus, although permanent contact with wound epidermis has previously been shown to be necessary for blastemal mesenchyme to form distal limb structures, such contact is not required for the formation of proximal skeletal elements. The implications of this finding for regional organization in the regenerating limb are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00634060
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    An analysis of the mutant Lethal non-evaginated of Drosophila melanogaster (1954)
    Springer
    Molecular genetics and genomics 86 (1954), S. 293-321 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312227
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Boekbesprekingen (1979)
    Springer
    Pharmacy world & science 1 (1979), S. 1035-1039 
    Details
    ISSN: 1573-739X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02293391
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1973)
    Springer
    Genetica 44 (1973), S. 505-510 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00161322
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    Paper (German National Licenses)
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