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  • 1
    Electronic Resource
    Electronic Resource
    Cannibalism as a life boat mechanism (1988)
    Springer
    Journal of mathematical biology 26 (1988), S. 619-633 
    Details
    ISSN: 1432-1416
    Keywords: Structured population model ; McKendrick equation ; Subcritical bifurcation ; Solver
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Under certain conditions a cannibalistic population can survive when food for the adults is too scarce to support a non-cannibalistic population. Cannibalism can have this lifeboat effect if (i) the juveniles feed on a resource inaccessible to the adults; and (ii) the adults are cannibalistic and thus incorporate indirectly the inaccessible resource. Using a simple model we conclude that the mechanism works when, at low population densities, the average yield, in terms of new offspring, due to the energy provided by one cannibalized juvenile is larger than one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276144
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  • 2
    Electronic Resource
    Electronic Resource
    Mother to child transmission of hepatitis B virus in the Philippines (1989)
    Springer
    Infection 17 (1989), S. 275-279 
    Details
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In den Philippinen wurde zwischen 1981 und 1983 eine Verlaufsstudie zur Mutter-Kind-Übertragung des Hepatitis-B-Virus durchgeführt. Bei 527 Müttern fand sich eine HBsAg-Prävalenz von 8,5%. Sieben von 17 Neugeborenen (41,2%) der HBsAg-Carrier-Mütter wurden im Ablauf der ersten 12 Lebensmonate HBsAg-positiv. Bei Kindern HBsAg-positiver Mütter war das Risiko einer HBsAg-Serokonversion 20mal höher als bei Kindern HBsAg-negativer Mütter (OR=18,9; 95%; Ci=2,0−86,6). Bei Müttern, die nicht nur HBsAg, sondern auch HBeAg-Carrier waren, bestand ein noch größeres Risiko für das Kind, HBsAg-positiv zu werden (OR=91,0; 95%; Ci=49,2−164,8). Bei Müttern, die HBsAg-Carrier, aber anti-HBe-positiv waren, bestand nur ein sehr geringes Übertragungsrisiko. Schätzungsweise sind ein Drittel der Fälle von HBsAg-Positivität bei einjährigen Kindern auf Mutter-Kind-Übertragung zurückzuführen. Die Bedeutung dieser Daten für die Planung von Impfaktionen zur Prävention von HBV-Infektionen wird diskutiert.
    Notes: Summary A follow-up study of mother to infant transmission of hepatitis B virus was conducted in the Philippines between 1981 and 1983. The prevalence of HBsAg among 527 mothers was 8.5%. Overall, seven out of 17 (41.2%) infants born to HBsAg carrier mothers became HBsAg positive within the first 12 months of life. The risk of becoming HBsAg positive was about 20 times higher for infants born to HBsAg positive mothers than for infants born to HBsAg negative mothers (OR=18.9, 95% Ci=2.0−86.6). The risk was even higher if the mother was a carrier of both HBsAg und HBeAg (OR=91.0, 95% Ci=49.2−164.8). However, the risk of transmission was very low if the mother was an HBsAg carrier and anti-HBe positive. It was estimated that mother to infant transmission accounts for about one third of HBsAg positivity at one year of age. The implications of these findings in the planning of vaccination campaigns to prevent HBV infections are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01650707
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on the development of the charge heterogeneity of the influenza virus glycoproteins (1985)
    Springer
    Archives of virology 83 (1985), S. 311-317 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The heterogeneity in charge of the influenza virus glycoproteins, hemagglutinin (HA) and neuraminidase (NA) is retained, when glycosylation is inhibited by tunicamycin (TM) or 2-deoxyglucose (2-dg). This is in contrast to the charge heterogeneity of the G protein of vesicular stomatitis virus (VSV), which is mainly due to heterogeneous sulfation of the carbohydrate side chains and therefore is abolished by the above mentioned inhibitors of glycosylation. Thus, the charge heterogeneity of influenza virus glycoproteins might be attributable to some as yet unidentified modifications of the polypeptide backbone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309926
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  • 4
    Electronic Resource
    Electronic Resource
    Cytomegalovirus infection and disease in renal transplant patients treated with cyclosporin (1989)
    Springer
    Transplant international 2 (1989), S. 92-95 
    Details
    ISSN: 1432-2277
    Keywords: Cytomegalovirus infection in kidney transplantation ; Cytomegalovirus disease and rejection ; Rejection and cytomegalovirus disease ; Risk factors for cytomegalovirus disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this prospective study, the incidence of cytomegalovirus (CMV) infection and CMV disease was determined in 175 renal transplant recipients on cyclosporin and low-dose prednisone. CMV infection occurred in 51.4% of the patients, CMV disease in 13.7%. The major manifestations of CMV disease were fever of unknown origin and leukopenia. In the group with CMV infection, there was an increased occurrence of rejection (60% in infected vs 27% in noninfected patients). In most patients (41/54), the rejection preceded the CMV infection. CMV infection did not lead to a decreased graft survival. There was no close time relationship between the onset of clinical symptoms of CMV disease and the laboratory confirmation of CMV infection. A subgroup of patients at risk for the development of severe CMV disease could not be identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459326
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  • 5
    Electronic Resource
    Electronic Resource
    On the production mechanism of the narrow positron lines observed in heavy-ion collisions (1987)
    Springer
    The European physical journal 328 (1987), S. 499-500 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Following a suggestion of Bang et al. we deduce that the total energy transfer associated with the narrow positron lines observed in heavy-ion collisions is given approximately by the sum of the rest masses of the positron and the accompanied electron plus their kinetic energies. Since the same behaviour has been established previously for the production process of the dynamically induced positrons, our observation represents a strong hint that the origin of the e+ -lines may also be connected with the strong Coulomb field occuring in heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289639
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  • 6
    Electronic Resource
    Electronic Resource
    Evidence for a resonance in positron-electron scattering at 810 keV centre-of-mass Energy (1988)
    Springer
    The European physical journal 330 (1988), S. 173-181 
    Details
    ISSN: 1434-601X
    Keywords: 13.10.+q ; 12.20.Fv ; 14.80.Pb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A monoenergetic positron (e +) beam (ΔT/T〈5·10−4) from the Stuttgart pelletron accelerator and a 4.6 mg/cm2 Be target has been employed to investigatee + e −scattering in the MeV region in a large solid angle with high statistics by means of a novel positionsensitive detector system. Superimposed on the Bhabha scattering, a structure has been found at ane + kinetic energy of 2263 keV (810 keV excitation energy in thee + e −rest frame). From the energy-integrated resonance cross-section of $$\sigma _{res} \cdot \Gamma _{res}^{e^ + e^ - } $$ ≅30 b·eV (c.m.) and the standard resonance cross-section we estimate partial resonance widths $$\Gamma _{res}^{e^ + e^ - } $$ ≅72 meV or 24 meV for total angular momenta J=0 or J=1, respectively. The structure, which has not been predicted within the framework of quantum electrodynamics, coincides with one of the sum energies of the correlatede + e −lines observed in heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293393
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  • 7
    Electronic Resource
    Electronic Resource
    Positron lines from subcritical heavy ion-atom collisions (1987)
    Springer
    The European physical journal 328 (1987), S. 129-145 
    Details
    ISSN: 1434-601X
    Keywords: 14.60.Cd ; 25.70.Cd ; 25.70.Ef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positron lines were observed in heavy ion-atom collisions at bombarding energies close to the Coulomb barrier in subcritical systems with the sum of the atomic numbers of the colliding nucleiZ u =Z 1+Z 2 being smaller thanZ u =172. Each collision system, studied,208Pb +208Pb(Zu=164),238U+181Ta(Zu=165), and238Au(Zu=171), exhibits the emission of two positron lines withZ u -independent c.m. energies of ∼ 258 keV and ∼ 340 keV, and with widths of about 30 keV, superimposed on continuous positron spectra from nuclear pair decay and pair emission induced by the time changing Coulomb field of the collision. The production cross section of thee +-lines rises with a high power ofZ u (ocZ u 22), which is comparable to theZ u 20-dependence for the collision induced positrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290655
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  • 8
    Electronic Resource
    Electronic Resource
    Multiple positron structures observed from U-U collisions at 5.6 MeV/u and 5.9 MeV/u (1987)
    Springer
    The European physical journal 326 (1987), S. 235-236 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High resolution positron spectroscopy in U-U collisions at bombarding energies of 5.6 MeV/u, the lowest energy studied until now as well as of 5.9 MeV/u, reveals similar multiple structures between 220 keV and 385 keV superimposed on the induced and nuclear continua.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283602
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental limits for narrow lines in the excitation function of positron-electron scattering aroundE *=620 keV andE *=810 keV (1987)
    Springer
    The European physical journal 326 (1987), S. 527-529 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289559
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  • 10
    Electronic Resource
    Electronic Resource
    Indonesian mungbean landraces II. Comparison of performance, components of variance and selection for grain yield under wide row-spacing in monoculture and when intercropped with maize (1987)
    Springer
    Euphytica 36 (1987), S. 791-801 
    Details
    ISSN: 1573-5060
    Keywords: Vigna radiata ; mungbean ; Zea mays ; maize ; landrace ; intercropping ; monoculture ; genotype x environment interaction ; single-plant selection ; progeny selection ; grain yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The possibility of testing mungbean for grain yield in monoculture in single wide-spaced row plots as an alternative to selection in intercropping with maize was investigated. Results indicated no significant genotype x planting pattern interactions and genetic correlation coefficients between grain yields in the two planting patterns were, in most cases, close to unity. It was concluded that, as far as the mungbean component in the mixture is concerned, yield selection in either of the two planting patterns is justified. Effects of single-plant and progeny selection on mungbean characteristics were also studied empirically. Lines derived from single-plant selection in monocropping or intercropping showed differences in yield, number of pods per plant and seed weight. Except for seed weight, no differential effects of progeny selection in monoculture or intercropping were observed for any characteristic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051862
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