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  • 1
    Electronic Resource
    Electronic Resource
    Evolution in bacteria: Evidence for a universal substitution rate in cellular genomes (1987)
    Springer
    Journal of molecular evolution 26 (1987), S. 377-377 
    Details
    ISSN: 1432-1432
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101157
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  • 2
    Electronic Resource
    Electronic Resource
    Emplacement, crystallization and alteration of spinifex-textured komatiitic basalt flows in the Archaean Nondweni greenstone belt, southern Kaapvaal Craton, South Africa (1989)
    Springer
    Contributions to mineralogy and petrology 101 (1989), S. 301-317 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A well exposed succession of spinifex-textured komatiite flows is reported from the Archaean Nondweni greenstone belt located near the southern margin of the Kaapvaal Craton. The flows are relatively thin (1–5 m) compared to similar occurrences in other greenstone belts. They are characterised by well developed cone structures of highly elongate amphibole crystals (after augite) which fan downwards from the tops of the flows. Extreme development of coned spinifex has not been reported from other greenstone belts and points to specific thermal conditions prevailing in the Nondweni environment. The zones of bladed spinifex are contained between layers of random spinifex and overlie a lower cumulus layer originally of augite, orthopyroxene and minor olivine. The observed major and trace element distributions through a 1.7 m thick spinifex-textured flow are consistent with a model involving concentration of phenocryst phases resulting in significant fractionation upwards in the flow. Approximately 40% of the spinifex-textured phenocrysts grew in situ after the lithological units were established. Collapse and displacement of the coned crystal networks, originally attached to the top of the flow, are shown to have influenced the distribution of liquid within the flow and accentuated the fractionation. Associated with the spinifex-textured units are massive aphyric and brecciated flows which show distinct chemical cycles through the succession. The brecciated zones have compositions with 〈18% MgO and are characterised by ovoid bodies that are not pillows and may represent magmatic reworking and movement of a partly congealed flow. Post-solidus alteration is considered to have caused early hydration of the original mineralogy and also introduced SiO2 and Na2O into the upper part of the flow by way of microfractures. The observed alteration is different to that of Mid-Ocean Ridge basalts, and a subaerial/shallow water environment is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00375315
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  • 3
    Electronic Resource
    Electronic Resource
    Complex unmixed spinels in layered intrusions within an obducted ophiolite in the Natal-Namaqua mobile belt (1988)
    Springer
    Mineralium deposita 23 (1988), S. 150-157 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Spinellids showing unmixed intergrowths of chromite or chromian spinel (sensu stricto) and magnetite or chromian magnetite are not known in mafic or ultramafic igneous rocks. They do occur within metamorphosed rocks that attained temperatures sufficiently high (upper amphibolite facies) for the formation of homogeneous Al-Cr-Fe3+-Ti spinel phases with compositions not matched in slowly cooled igneous rocks. In the Tugela Rand intrusion complex intergrowths of chromian spinel, chromian magnetite, ulvöspinel, ilmenite and a transparent aluminous spinel are observed and interpreted in terms of the thermal history of the rocks. Compositional differences between the separate areas of chromian spinel and chromian magnetite in complex intergrowths exhibited by the metamorphosed Tugela Rand and Mambulu Complexes confirm the extension of the magnetite-hercynite solvus (Turnock and Eugster 1962) towards magnesium- and chromium-rich compositions. The Tugela Rand spinellids are compared with those from the Carr Boyd Complex (Purvis et al. 1972) and the ultramafic rocks of the Giant Nickel Mine (Muir and Naldrett 1973) and the Red Lodge district (Loferski and Lipin 1983). Significant differences between the spinels from the Red Lodge district compared to the other three occurrences may reflect the different metamorphic histories of these areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206665
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of poly(acrylic acid) molecular weight on the fracture toughness of glass-ionomer cements (1989)
    Springer
    Journal of materials science 24 (1989), S. 363-371 
    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 A linear elastic fracture mechanics approach has been used to characterize failure in glass-ionomer cements. The toughness, fracture toughness, flexural strength and inherent flaw size increase with the molecular weight of the poly(acrylic acid), whilst the Young's modulus remains approximately constant. The dependence of toughness on poly(acrylic acid) molecular weight is not as large as predicted by a reptation/chain pull out model for fracture and this is thought to be a result of the weak ionic crosslinks formed during the cement reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00660982
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  • 5
    Electronic Resource
    Electronic Resource
    The source of the nerve fibres forming the deep muscular and circular muscle plexuses in the small intestine of the guinea-pig (1987)
    Springer
    Cell & tissue research 247 (1987), S. 497-504 
    Details
    ISSN: 1432-0878
    Keywords: Enteric nervous system ; Intestine, small ; Nerves, degeneration ; Neuronal connections ; Guinea-pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A quantitative ultrastructural study was made of the neuntes forming the deep muscular and circular muscle plexuses of the guinea-pig small intestine following microsurgical lesions designed to interrupt intrinsic and extrinsic nerve pathways within the intestinal wall. Removal of a collar of longitudinal muscle with attached myenteric plexus from the circumference of a segment of small intestine resulted in the subsequent disappearance of 99.3% of neurites in the underlying circular muscle. The few surviving neurites in the deep muscular plexus and circular muscle disappeared completely from lesioned segments that were, in addition, extrinsically denervated surgically. These results indicate that the majority of nerve fibres in the deep muscular and circular muscle plexuses of the guinea-pig small intestine is intrinsic to the intestine and originates from nerve cell bodies located in the overlying myenteric plexus. At the light-microscopic level, nerve bundles were traced from the myenteric plexus to the circular muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215742
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  • 6
    Electronic Resource
    Electronic Resource
    Spatial dynamics: Classical problems, an integrated modelling approach and system performance (1985)
    Springer
    Papers in regional science 58 (1985), S. 47-57 
    Details
    ISSN: 1435-5957
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Economics
    Notes: Abstract The common nature of a range of ‘classical’ geographical problems is described. By adopting a particular system description and set of methods, it is shown that it is possible to develop an integrated framework within which the traditional models can be seen as special cases and whose assumptions can be relaxed. It is the ideas of dynamical systems theory, developed in a specific way for geographical systems, which enables such an integrated model system to be built. The framework is then extended by introducing and developing the concept of performance indicators which have roles both in model development and planning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935253
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  • 7
    Electronic Resource
    Electronic Resource
    H0323+022: Classification as a BL Lac and EXOSAT coordinated observations (1985)
    Springer
    Space science reviews 40 (1985), S. 613-617 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The object H0323+022 (Doxsey et al. 1983) has been shown to be a BL Lac object by virtue of a diversity of observational characteristics at radio, optical, and x-ray wavelengths, in agreement with the conclusion of Margon and Jacoby (1984). Multi-frequency coordinated observations of this highly variable object with EXOSAT in September 1984 found it to be in a faint quiescent state (∼1/3; μJy at ∼5 keV and V=16.55). Preliminary results from the latter observations are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179875
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  • 8
    Electronic Resource
    Electronic Resource
    Techniques for the analysis of long-term cardiorespiratory recordings from infants (1988)
    Springer
    Medical & biological engineering & computing 26 (1988), S. 282-288 
    Details
    ISSN: 1741-0444
    Keywords: Data classification ; Heart rate ; Long-term recordings ; Respiratory rate ; Time-series analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The paper describes a series of techniques for the analysis of long-term cardiorespiratory recordings from infants. The analysis performed is based on analysing the respiratory rate, respiratory-rate variability, heart rate and the heart-rate variability measured for nonoverlapping time epochs of approximately 100s duration throughout the recordings. Three descriptors of each of these four data series have been used. First, the mean value and standard deviation; secondly, the probability density function, which was then processed by a principal-components factor analysis to achieve data reduction and classification to make comparisons between different groups of infants; and finally, the power spectral density function. These techniques provide a comprehensive method for analysing long-term cardiorespiratory recordings which should greatly extend their value for both routine clinical use and for research purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447082
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  • 9
    Electronic Resource
    Electronic Resource
    A summary of investigations on clamp storage of potatoes in England (1949)
    Springer
    European journal of plant pathology 55 (1949), S. 179-186 
    Details
    ISSN: 1573-8469
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Samenvatting Ondanks het feit dat het grootste deel van de aardappeloogst in Engeland op het veld wordt ingekuild, zijn er betrekkelijk weinig quantitatieve gegevens bekend over de condities in de kuilen. Er wordt een overzicht gegeven van de literatuur betreffende het gebruik, van kalk in de kuilen, temperaturen in de kuilen, percentage koolzuur, spruitvorming, gewichtsverlies, chemische veranderingen in de knollen, en het gebruik van anti-spruit middelen. Tevens worden enige gegevens uit eigen niet gepubliceerd werk en dat van collega's medegedeeld. Volgens de schrijvers is veel meer quantitatief onderzoek betreffende het inkuilen vereist ter vaststelling van de variatiebreedte en het gemiddelde van de verschillende factoren, zoals deze door rassen, groeistreek en seizoenen beinvloed worden. Zij zijn van mening, dat het mogelijk zou zijn de belangrijke hoeveelheid arbeid nodig om dit soort onderzoek te verrichten te vereenvoudigen, door in de kuilen te werken met afgewogen monsters, bij voorkeur in zakken gemaakt van draden van plastic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01982581
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  • 10
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    Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector (2015)
    Springer
    Details
    Publication Date: 2015-04-01
    Print ISSN: 1126-6708
    Electronic ISSN: 1029-8479
    Topics: Physics
    Published by Springer
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