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  • Springer  (7)
  • International Union of Crystallography (IUCr)  (1)
  • 1980-1984  (3)
  • 1970-1974  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Electron microscopic observations of the surface of L-cells in culture (1970)
    Springer
    The journal of membrane biology 2 (1970), S. 300-316 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Techniques are described for the preparation of preshadowed replicas of both the upper and lower surfaces of L-cells in culture, and of cross sections of L-cells growing on a cellophane substrate. These revealed long slender microvilli, 800 to 1,100 A in diameter, projecting from both upper and lower surfaces of the cells. These microvilli were frequently observed to contact other cells and substrate, and to leave material behind on the substrate. The plasma membrane of the lower surface was separated from the substrate by an electron-lucent gap 200 to 300 A wide. The surface coat of the L-cell was visualized by staining with colloidal iron and ruthenium. Staining with colloidal iron was most intense on the surface of the microvilli. The gap between cell and substrate was intensely stained with ruthenium red. Enzymatic digestion of living cells revealed that both trypsin and neuraminidase reduced the staining of the cell coat by colloidal iron, whereas only trypsin altered its staining with ruthenium red. After trypsin treatment, fragments of an amorphous material with the staining characteristics of the cell coat were observed between the denuded cells. Treatment with ribonuclease, chymotrypsin or hyaluronidase did not affect the staining of the cell coat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01869866
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Joint X-ray and neutron data refinement of structural and charge density parameters (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 857-863 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A procedure for joint refinement of X-ray and neutron data is described in which structural, charge density and extinction parameters are adjusted simultaneously in order to arrive at the best least-squares solution with respect to all available diffraction data. This X + N refinement is applied to previously collected low-temperature data on oxalic acid dihydrate, C2H2O4.2H2O, and results are compared with the X-ray-only refinement, and an X-ray refinement with neutron values for the hydrogen structural parameters. The X + N model deformation density shows higher peak heights in the lone-pair regions than the X- ray-only model density and resembles more closely the X-N deformation maps. Though the X + N maps are more strongly model dependent, they contain less noise, provide an analytical description of the deformation density and, unlike the X-N density, can be obtained in principle with a less than complete data set. The estimate of the goodness-of-fit for each of the data sets requires an apportioning of the joint parameters, which in this study is based on the relative magnitude of the least-squares derivatives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481001873
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  • 3
    Electronic Resource
    Electronic Resource
    The sterols of the echinoderm,Ctenodiscus crispatus retzius (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 258-259 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Aus dem SchlammsternCtenodiscus crispatus wurde ein kompliziertes Gemisch von Sterolen isoliert, die als Homologe des 5α-Cholest-7-en-3β-ols und deren 24-Methylderivate erkannt wurden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01926460
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  • 4
    Electronic Resource
    Electronic Resource
    Methods of sampling and analysis for predictive results in the introduction of entomophagous insects (1972)
    Springer
    BioControl 17 (1972), S. 211-222 
    Details
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Nous proposons ici des méthodes en vue d’une approche théorique du choix et de l’introduction d’Insectes entomophages. Une fois établis les besoins nécesaires aux organismes pour leur reproduction et leur survie, on choisit des sites afin d’échantillonner les Insectes en fonction des degrés d’un certain facteur critique. Quelle que soit la forme des gradients utilisés la répartition des échantillons doit être représentative des composantes du milieu. La distribution des entomophages d’après ces composantes est anlysée et quantifiée au moyen d’une formule qui montre l’aire de distribution d’un espèce, la similitude entre les distributions, et l’interaction à laquelle chaque espèce devra faire face dans chacun des groupes de composantes. Ces calculs peuvent être d’une grande utilité dans le choix de la meilleure espèce à introduire dans une région dont on connaît la composition et la distribution des espèces.
    Notes: Abstract Methods are proposed as a contribution towards the formalization of an approach to the selection and introduction of entomophagous insects. Once the critical resources necessary for the reproduction and survival of a predator or parasitoid have been identified, sites are arranged to sample these insects in different grades of the same critical factor. These grades of a resource may be ranked, and organized on gradients, or unranked, but in both cases the range of samples represents a resource set. The entomophagous insect distributions on these sets are analyzed and quantified by formulae that show the breadth of a species distribution, the similarity between distributions, and the interaction species will experience on each of the resource sets. These calculations can assist in selecting the best species for introduction into an area with a known species composition and distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371131
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  • 5
    Electronic Resource
    Electronic Resource
    Genic variation in the deer mouse, Peromyscus maniculatus, in a small geographic area (1981)
    Springer
    Genetica 57 (1981), S. 65-74 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genic variation was examined with starch and polyacrylamide gel electrophoresis at 14 loci in 12 populations of Peromyscus maniculatus nubiterrae from a small part of the Appalachians in eastern Tennessee and western North Carolina. Polymorphism was observed at eight loci with no significant correlations between frequency of common genotypes or alleles and altitude. Average individual heterozygosity (\-H) values were low for P. maniculatus whether using only ‘slow’ evolving loci (mean = 3.0%) or both ‘slow’ and ‘fast’ evolving loci (mean = 4.9%). No significant correlation was present between altitude and \-H. Interlocality variation of \-H was as great in this study as previously reported for P. maniculatus over larger geographic areas. Rogers' coefficients of genetic similarity of paired combinations of populations based on ‘slow’ evolving loci (range of 0.941 to 0.997) or based on ‘slow’ and ‘fast’ evolving loci (range of 0.858 to 0.974) showed all populations to be highly similar. Ranges of similarity values observed in the present study were as great as those previously reported for P. maniculatus over a larger geographic area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00057543
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  • 6
    Electronic Resource
    Electronic Resource
    A cosmochemical view of cosmic rays and solar particles (1973)
    Springer
    Space science reviews 15 (1973), S. 69-88 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The composition of cosmic rays and solar particles is reviewed with emphasis on the question of whether they are representative samples of Galactic and solar matter. The composition of solar particles changes with energy and from flare to flare. A strong excess of heavy elements at energies below a few MeV/nuc decreases with energy, and at energies above ∼15 MeV/nuc the composition of solar particles resembles that of galactic cosmic rays somewhat better than that of the solar atmosphere. The elements Ne through Pb have remarkably similar abundances in cosmic ray sources and in the matter of the solar system. The lighter elements are depleted in cosmic rays, whereas U and Th may be enriched or not, depending on whether the meteoritic or solar abundance of Th is used. Two prototype sources of cosmic rays are considered: gas with solar system composition but enriched in elements with Z 〉 8 during acceleration and emission (by analogy with solar particle emission), and highly evolved matter enriched in r-process elements such as U, Th and transuranic elements. The energy-dependence of cosmic ray composition suggests that both sources may contribute at different energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00172437
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  • 7
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    Unknown
    The sterols of the echinoderm,Ctenodiscus crispatus retzius (1973)
    Springer
    Details
    Publication Date: 1973-03-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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  • 8
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    Genic variation in the deer mouse, Peromyscus maniculatus, in a small geographic area (1981)
    Springer
    Details
    Publication Date: 1981-11-01
    Print ISSN: 0016-6707
    Electronic ISSN: 1573-6857
    Topics: Biology
    Published by Springer
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