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  • 1
    Electronic Resource
    Electronic Resource
    New Constituents of Prunus africana Bark Extract (1984)
    s.l. : American Chemical Society
    Journal of natural products 47 (1984), S. 910-910 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50035a039
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  • 2
    Electronic Resource
    Electronic Resource
    Protoplast formation, regeneration and plasmid curing in Lactobacillus reuteri (1984)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 23 (1984), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract A method for protoplast formation and regeneration suitable for Lactobacillus reuteri strains was developed.Lysozyme-treated cells formed protoplasts at a high percentage and regenerative ability varied according to the strains considered.Moreover, production and regeneration of protoplasts promoted the loss of plasmids harboured by the strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1984.tb01089.x
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of dichloro[1,2-ethanedione bis(dimethylhydrazone)](η-ethylene)platinum(II), [PtCl2(C2H4)(C6H14N4)] (1984)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 2035-2037 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270184010520
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  • 4
    Electronic Resource
    Electronic Resource
    α-(Acetyl-D-amino)butyric acid monohydrate (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 1132-1134 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740881005268
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  • 5
    Electronic Resource
    Electronic Resource
    G6PD Cagliari: A new low activity glucose 6-phosphate dehydrogenase variant characterized by enhanced intracellular lability (1984)
    Springer
    Human genetics 〈Berlin〉 66 (1984), S. 62-65 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new variant of human erythrocyte glucose 6-phosphate dehydrogenase (G6PD), designated G6PD Cagliari, has been characterized. It is associated with severe enzyme deficiency and can be placed in Class 2 of the usual tabulation of G6PD variants. The specific activity of this variant is near normal, while its decay within the circulating erythrocytes is very rapid compared with normals. Genetic analysis of the family of the propositus indicated that the two available females are heterozygotes characterized by extremely unbalanced mosaic phenotypes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275188
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  • 6
    Electronic Resource
    Electronic Resource
    Detection of pseudo gamma-ray bursts of long duration (1981)
    Springer
    Astrophysics and space science 75 (1981), S. 211-217 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is known that the counting rate of both Nai and Csi hard X-ray detectors can have intense enhancements of brief (〈1 s) duration, which appear like very short cosmic gamma-ray bursts but probably are due to phosphorescence in the detector itself. Unfortunately, this problem is not limited to short bursts. We present here three much longer (up to 80 s) pseudo-gamma-ray bursts observed during a transatlantic ballon flight. We conclude that detections of gamma-ray bursts (and probably also of hard X-ray source flares) based only on a rate increase by a single scintillator should always be confirmed by at least one other instrument.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651397
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  • 7
    Electronic Resource
    Electronic Resource
    Random ecological systems with structure: Stability-complexity relationship (1982)
    Springer
    Bulletin of mathematical biology 44 (1982), S. 103-117 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We have numerically examined more than one million Large Complex Systems (LCS) of interacting variables (interpretable as interacting populations) governed by Generalized Lotka-Volterra Equations (GLV), with self-regulation term. The scope was to have some insight on the stability-complexity relationship. We considered systems of prey-predator type, and we gave appropriate rules for constructing the model systems, rules that specify the behaviour of model systems in order to put them near the biological reality. The results show, among other things, a strict correlation between the stability and the prey-predator ratio (which, in our model, uniquely determines the connectedness of the system).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459422
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  • 8
    Electronic Resource
    Electronic Resource
    Fatigue-crack advance mechanisms in polymers (1984)
    Springer
    Journal of materials science 19 (1984), S. 385-395 
    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 room-temperature fatigue-crack propagation behaviour of poly(butylene terephthalate) is strongly influenced by hysteretic heating near the crack tip since the glass transition temperature is just above room temperature. At low frequencies or stress intensities, the crack tip damage zone consists of several layers of crazes. At high frequencies or stress intensities, hysteretic heating causes a drop in yield stress and a large increase in the depth of the crack tip damage layer. At the same time, the increase in the plane stress plastic zones near the free surfaces produces large shear lips which flank the interior craze zone. This transformation results in a crack growth rate transition which appears as a crack deceleration followed by rapid crack acceleration. This thermal transition can be suppressed or delayed by immersion in water or silicone oil to reduce heat build-up in the sample during testing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403224
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  • 9
    Electronic Resource
    Electronic Resource
    Fatigue-crack advance mechanisms in polymers (1984)
    Springer
    Journal of materials science 19 (1984), S. 385-395 
    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 room-temperature fatigue-crack propagation behaviour of poly(butylene terephthalate) is strongly influenced by hysteretic heating near the crack tip since the glass transition temperature is just above room temperature. At low frequencies or stress intensities, the crack tip damage zone consists of several layers of crazes. At high frequencies or stress intensities, hysteretic heating causes a drop in yield stress and a large increase in the depth of the crack tip damage layer. At the same time, the increase in the plane stress plastic zones near the free surfaces produces large shear lips which flank the interior craze zone. This transformation results in a crack growth rate transition which appears as a crack deceleration followed by rapid crack acceleration. This thermal transition can be suppressed or delayed by immersion in water or silicone oil to reduce heat build-up in the sample during testing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553561
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  • 10
    Electronic Resource
    Electronic Resource
    Fatigue crack advance mechanisms in polymers: rubber toughening mechanisms in blends of poly(2,6-dimethyl -1,4-phenylene oxide) and polystyrene (1983)
    Springer
    Journal of materials science 18 (1983), S. 1836-1844 
    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 fatigue crack propagation behaviour of rubber toughened blends of poly(2,6-dimethyl-1,4-phenylene oxide) (PXE) and polystyrene (PS) were studied. The nature of the fatigue crack tip damage zone development and the subsequent crack tip advance mechanism through this damage zone were also examined. In the control blend with no rubber particles, several long crazes preceded the crack tip and provided an easy path for crack propagation. The addition of rubber particles, however, led to massive microcrazing over a considerably enlarged zone about the crack tip. This proved to be an effective energy dissipation mechanism which resulted in reduced fatigue crack growth rates. When PS was substituted for PXE in the polymer matrix, although microcrazing still occurred over an enlarged crack tip damage zone, many of the microcrazes grew to macroscopic size, thus reducing the fatigue toughness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542080
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