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  • 1
    Electronic Resource
    Electronic Resource
    Two scanning tunneling microscope devices for large samples (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2699-2701 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Two scanning tunneling microscopes (STMs) operating in air were designed for imaging samples with dimensions up to 75 mm diam and 25 mm thickness. Both STMs allow a wide sampling range capability to be obtained by means of xy sample positioning stages spanning 25 mm with 0.1 μm resolution. The automatic tip-sample approach is achieved in the two devices by moving either the head scanning stage or the sample holder. These STMs were successfully used to image highly oriented pyrolithic graphite, gratings, and indentations made on hardened steel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143860
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic architecture of growth curve parameters in chickens (1991)
    Springer
    Theoretical and applied genetics 83 (1991), S. 24-32 
    Details
    ISSN: 1432-2242
    Keywords: Genetics ; Growth curve ; Body weight ; Chickens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Genetic improvement in growth of poultry has traditionally proceeded via selection for body weight at a fixed age. Due to increased maintenance costs and reproductive problems of adult broiler breeders, the potential for genetic manipulation of the growth curve has been receiving increased interest. Research of both male and female progeny of a three-way diallel cross was used to investigate the inheritance of growth curve parameters. The Laird form of the Gompertz equation was used to determine growth curve parameters, and was suited to the juvenile growth data frequently collected from meat-type chickens. Growth rate exhibited significant heterosis due to both autosomes and the sex chromosomes. Age at inflection point also exhibited significant average heterosis, though only among females. Growth rate was also influenced by average line effects, as was age at inflection point. Maternal effects had no influence on growth curve parameters, while additive sex linkage was observed for growth rate. Phenotypic and genetic correlations were calculated among the growth curve parameters and suggest that specific breeding programs could alter the growth trajectory of the contemporary broiler chicken. Moderate heritabilities were observed for the growth curve parameters and support the hypothesis that the growth curve could be altered via genetic manipulation of early postnatal growth, especially during the first 14 days post-hatch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229222
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  • 3
    Electronic Resource
    Electronic Resource
    Heterosis for concentrations of dopamine, norepinephrine, their metabolites, and epinephrine in the chick hyperstriatum ventrale, hypothalamus, and optic tectum (1992)
    Springer
    Behavior genetics 22 (1992), S. 381-398 
    Details
    ISSN: 1573-3297
    Keywords: Gallus domesticus ; chicks ; diallel ; heterosis ; dominance ; overdominance ; dopamine ; norepinephrine ; epinephrine ; 3,4-dihydroxyphenylacetic acid (DOPAC) ; 3-methoxy-4-hydroxyphenylglycol (MHPG) ; hypothalamus ; hyperstriatum ventrale ; optic tectum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract A complete diallel cross using both sexes was derived from four parental populations of chickens having divergent developmental rates. This paradigm was used to investigate the genetic architecture of the neurochemicals, norepinephrine (NE), epinephrine (EPI), 3,4-dihydroxyphenylacetic acid (DOPAC), dopamine (DA), and 3-methoxy-4-hydroxyphenylglycol (MHPG). No sex differences were found for any genetic parameter investigated. Estimates of average line effects, maternal effects, and additive sex linkage were not significant. Highly significant heterosis, in the form of overdominance, was observed for catecholamine and metabolite concentrations. Hybrids exhibited significant line heterosis in the positive direction for NE, while heterosis for MHPG was observed in the negative direction for all crosses. Heterosis for EPI was both line and brain area specific with the hypothalamus showing greatest heterotic effects. DOPAC showed significant heterosis for all lines only in the optic tectum, and DA showed little heterosis specific to any line, cross, or brain area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066669
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  • 4
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    Two scanning tunneling microscope devices for large samples (1993)
    American Institute of Physics
    Details
    Publication Date: 1993-09-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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