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  • Springer  (59)
  • Springer Nature
  • MDPI Publishing
  • Mineralogical Society of Great Britain and Ireland
  • 1990-1994  (59)
  • 1
    Electronic Resource
    Electronic Resource
    Neutral strange particle production in neutrino and antineutrino charged current interactions on protons (1993)
    Springer
    The European physical journal 57 (1993), S. 197-209 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production of the neutral strange particlesK 0, Λ and $$\bar \Lambda $$ invp and $$\bar vp$$ charged current interactions is studied in an experiment with the Big European Bubble Chamber. Mean multiplicities are measured as a function of the event variablesE v,W 2 andQ 2 and of the hadron variablesx F,z andp T 2 .K *± (892) and∑ *± (1385) signals are observed, whereas there is no evidence for∑ *- (1385) production invp scattering. Forward, backward and total mean multiplicities are found to compare well with the predictions of an empirical model for deep-inelastic reactions in the case of the strange mesonsK 0 andK *± (892) but less so for the strange baryons Λ, $$\bar \Lambda $$ and∑ *± (1385). The strange baryon multiplicities are used to obtain the decuplet to octet baryon production ratio and to assess the probabilities of auu orud system to break up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01565049
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  • 2
    Electronic Resource
    Electronic Resource
    Multiplicity distributions of charged hadrons invp and charged current interactions (1992)
    Springer
    The European physical journal 54 (1992), S. 45-54 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using data onvp and $$\bar vp$$ charged current interactions from a bubble chamber experiment with BEBC at CERN, the multiplicity distributions of charged hadrons are investigated. The analysis is based on ∼20000 events with incidentv and ∼10000 events with incident $$\bar v$$ . The invariant massW of the total hadronic system ranges from 3 GeV to ∼14 GeV. The experimental multiplicity distributions are fitted by the binomial function (for different intervals ofW and in different intervals of the rapidityy), by the Levy function and the lognormal function. All three parametrizations give acceptable values forX 2. For fixedW, forward and backward multiplicities are found to be uncorrelated. The normalized moments of the charged multiplicity distributions are measured as a function ofW. They show a violation of KNO scaling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01881707
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  • 3
    Electronic Resource
    Electronic Resource
    Inclusive ρ0(770) meson production invp and $$\bar vp$$ charged current interactions (1991)
    Springer
    The European physical journal 51 (1991), S. 11-24 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using data obtained with the bubble chamber BEBC at CERN, the inclusive ρ0 (770) meson production in νp and $$\bar vp$$ charged current reactions is studied. The average ρ0 multiplicity is measured as a function of the event variablesE ν ,W 2,Q 2,x Bj , and the charged multiplicity. The differentialx F ,y *,z andp T 2 distributions of the ρ0 are presented as well as the averagep T 2 as a function ofW 2 andx F . The ρ0/π0 ratio and the fractions of the π± originating from ρ0 decays are given as functions ofx F . The results are compared to the predictions of fragmentation models. A particular version of the Lund model predicts ρ0 multiplicities which are generally too high, although it qualitatively reproduces many aspects of the data. The ρ0 multiplicities predicted by a semi-empirical model (Wells model) are in quantitative agreement with the measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579556
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  • 4
    Electronic Resource
    Electronic Resource
    Diffractive production of ρ-mesons and of ρπ-systems by neutrinos and antineutrinos on protons (1993)
    Springer
    The European physical journal 58 (1993), S. 375-386 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Evidence is presented for diffractive production of ρ-mesons and of ρπ-systems invp and $$\bar \nu p$$ chargedcurrent interactions. In the (anti-)neutrino energy range 10 GeV〈E v 〈60 GeV the cross sections for diffractive ρ and diffractive ρπ production are found to be (0.64±0.14 (stat.)±0.08 (syst.))% and (0.28±0.08 (stat.)±0.04 (syst.))% of the charged-current cross section. The diffractive ρπ signal is consistent with being entirely due to diffractivea 1 production. However, the data cannot distinguish between diffractivea 1 and diffractive nonresonant ρπ production. The experimental distributions ofW, Q 2,x Bj andy Bj for diffractive ρ and ρπ events are consistent with model predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01557695
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  • 5
    Electronic Resource
    Electronic Resource
    Inclusivef 2 (1270) meson production in νp and $$\bar vp$$ charged current interactions (1991)
    Springer
    The European physical journal 51 (1991), S. 205-208 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using data obtained with the bubble chamber BEBC at CERN, the inclusivef 2 (1270) meson production invp and $$\bar vp$$ charged current reactions is studied. It is found thatf 2 production occurs mainly in events with a hadronic invariant massW≳7 GeV. In these events, the averagef 2 multiplicity is about half the average ρO multiplicity, and thex F andp T 2 distributions of thef 2 agree in shape with those of the ρO. The predictions of a semi-empirical model (Wells model) are in accord with the measured multiplicities atW〉7 GeV, whereas at lowerW the model predicts too largef 2 multiplicities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01475789
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  • 6
    Electronic Resource
    Electronic Resource
    Relative absorption of the two enantiomers of terbutaline after duodenal administration (1990)
    Springer
    European journal of clinical pharmacology 38 (1990), S. 621-623 
    Details
    ISSN: 1432-1041
    Keywords: terbutaline ; absorption ; enantiomers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The absorption of the two enantiomers of terbutaline, (+)-terbutaline and (-)-terbutaline, and of the racemate, (±)-terbutaline, has been studied in six healthy volunteers using a newly developed intestinal perfusion technique. The area under the plasma concentration curve for the (-)-enantiomer was more than twice that for the (+)-enantiomer. The data demonstrate a clear difference in absorption efficiency between (-)- and (+)-terbutaline, but further studies are required to establish whether (-)-terbutaline influences the absorption of (+)-terbutaline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278593
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  • 7
    Electronic Resource
    Electronic Resource
    Asymmetrical correlated responses to selection under an infinitesimal genetic model (1992)
    Springer
    Theoretical and applied genetics 84 (1992), S. 323-329 
    Details
    ISSN: 1432-2242
    Keywords: Asymmetry ; Correlated response ; Selection ; Infinitesimal model ; Heritability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Asymmetry in correlated responses to selection is expected when more than one cycle of selection is practised due to changes in genetic parameters produced by selection. In large populations, under the infinitesimal model these changes are due to linkage disequilibrium generated by selection and not to gene frequency changes. This study examines the conditions under which asymmetrical correlated responses are to be expected when an infinitesimal model is considered. Asymmetrical correlated responses in two traits in respect to which trait is selected are expected if the two traits have different heritabilities. Predicted asymmetry increases with the absolute value of the genetic correlation between the two traits, the difference between the two heritabilities, the intensity of selection and the number of generations of selection. Linkage disequilibrium generated by selection should be taken into account in explaining asymmetrical correlated responses observed in selection experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229490
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  • 8
    Electronic Resource
    Electronic Resource
    Index versus tandem selection after repeated generations of selection (1993)
    Springer
    Theoretical and applied genetics 85 (1993), S. 706-712 
    Details
    ISSN: 1432-2242
    Keywords: Selection index ; Tandem selection ; Multiple selection ; Linkage disequilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A theoretical comparison between two multiple-trait selection methods, index and tandem selection, after several generations of selection was carried out. An infinite number of loci determining the traits, directional and truncation selection, discrete generations and infinite population size were assumed. Under these assumptions, changes in genetic parameters over generations are due to linkage disequilibrium generated by selection. Changes continue for several generations until equilibrium is approached. Algebraic expressions for asymptotic responses from index selection can be derived if index weights are maintained constant across generations. Expressions at equilibrium for genetic parameters and responses are given for the index and its component traits. The loss in response by using initial index weights throughout all generations, instead of updating them to account for changes in genetic parameters, was analyzed. The benefit of using optimum weights was very small ranging from 0% to about 1.5% for all cases studied. Recurrence formulae to predict genetic parameters and responses at each generation of selection are given for both index and tandem selection. A comparison between expected response in the aggregate genotype at equilibrium from index and tandem selection is made considering two traits of economic importance. The results indicate that although index selection is more efficient for improving the aggregate breeding value, its relative efficiency with respect to tandem selection decreases after repeated cycles of selection. The reduction in relative efficiency is highest with the highest selection intensity and heritabilities and with negative correlations between the two traits. The advantage of index over tandem selection might be further reduced if changes in genetic parameters due to gene frequency changes produced by selection, random fluctuations due to the finite size of the population, and errors in estimation of parameters, were also considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225009
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of selection on genetic parameters of correlated traits (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 746-752 
    Details
    ISSN: 1432-2242
    Keywords: Selection ; Linkage disequilibrium ; Correlated response ; Genetic correlation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Changes in genetic parameters of correlated traits due to the buildup of linkage (gametic phase) disequilibrium from repeated truncation selection on a single trait are studied. After several generations of selection, an equilibrium is approached where there are no further changes in genetic parameters and limiting values are reached. Formulae are derived under an infinitesimal model for these limiting values of genetic variances and covariances, heritabilities, and genetic correlations between traits directly and indirectly selected. Changes from generation zero to the limit in all these parameters become greater as heritability of the trait under direct selection increases and, to a lesser extent, as intensity of selection increases. Change in heritability of a trait under indirect selection also increases as the absolute value of the correlation between the trait under indirect and the trait under direct selection increases. The change is maximum when the initial value of heritability is close to 0.5 and insignificant when the initital value is close to zero or one. Change in the genetic correlation between the trait under direct selection and the trait under indirect selection is maximum when its initial value is close to ±0.6 and insignificant when its initial value is close to zero or ±1. Heritability of the trait indirectly selected and genetic correlation between that trait and the trait directly selected always decrease in absolute value, whereas genetic correlation between two traits indirectly selected can either decrease or increase in absolute value. It is suggested that use be made of formulae at selection equilibrium in the prediction of correlated responses after several generations of selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224187
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  • 10
    Electronic Resource
    Electronic Resource
    The use of constrained selection indexes in breeding for economic merit (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 801-805 
    Details
    ISSN: 1432-2242
    Keywords: Economic weights ; Restricted indexes ; Desired gains
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Various methods exist for the derivation of restricted and/or desired gains selection indexes, and their use in applied breeding has been advocated. It is shown that there exists a set of implied linear economic weights for all constrained indexes and their derivation is given. Where economic weights are linear and known, a standard selection index is, by definition, optimal and thus a constrained index will usually be suboptimal. It is argued that economic weights can always be estimated and that the effects of uncertain weights can be examined by sensitivity analysis. If economic weights are nonlinear, use of the first order (linear) economic weights or a derived linear index, using previously described methods, will give very close to optimum economic selection responses. Examples from the literature indicate that severe losses of potential economic gain can possibly occur through use of a constrained index. It is concluded that constrained indexes should be avoided for economic genetic selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224195
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