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  • 1
    Electronic Resource
    Electronic Resource
    Genotypic frequencies of phosphoglucose isomerase allozymes in bean rust (Uromyces appendiculatus) populations estimated by densitometry (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 39 (1990), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Phosphoglucose isomerase (PGI) is a dimeric enzyme in germinating urediniospores of Uromyces appendiculatus. Three distinct bands occur in heterozygous isolates after starch gel electrophoresis. Transmission densitometry was used to estimate the frequency of the homozygous slow (S), homozygous fast (F), and heterozygous (H) individuals in mixed preparations of urediniospores. Areas under each band peak were transformed to genotypic frequencies by comparison with standard 1:1 (F:S)and 100% H preparations. Estimated genotypic and allelic frequencies in prepared mixtures were linearly related to the actual frequencies. Correspondence of estimated with actual frequencies was high, generally differing by 10% or less. Three of 10 field collections examined were polymorphic for PGI allozymes, and two of these were apparently in Hardy-Weinberg equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1990.tb02480.x
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  • 2
    Electronic Resource
    Electronic Resource
    Two distinct transitions in ultrafast solid-liquid phase transformations of GaAs (1991)
    Springer
    Applied physics 53 (1991), S. 227-234 
    Details
    ISSN: 1432-0630
    Keywords: 64.70 Dv ; 71.30+h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Femtosecond-laser-induced changes of the optical reflectivity and the reflected second harmonic are measured over a wide range of times and laser fluences. Changes of the linear and nonlinear optical properties suggestive of a transition to a metallic state have been observed. For relatively low fluences these changes take tens of picoseconds to develop. For higher fluences the transition takes place in just a few hundred femtoseconds. Our data suggest that, depending on the laser excitation conditions, two distinctly different types of phase transformations are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324257
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  • 3
    Electronic Resource
    Electronic Resource
    Femtosecond Time-Resolved Microscopy of Laser-Induced Morphology Changes (1994)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 173-174 (Sept. 1994), p. 1-6 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/00/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.173-174.1.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Chlorophyll fluorescence lifetime determination of waterstressed C3- and C4-plants (1992)
    Springer
    Radiation and environmental biophysics 31 (1992), S. 141-151 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Summary This article describes the effect of water stress on the room temperature chlorophyll fluorescence lifetime of plants of wheat (C3) and maize (C4). In addition, net CO2 assimilation rate (P N ), stomatal conductance and the fluorescence quenching coefficientsqP andqNP at steady state conditions were recorded. The overall fluorescence decay of the control plants can be described by an average decay time of 1 ns for both plant types. Water stress did not modify this parameter in the case of wheat, whereas a shortening of the decay was observed for waterstressed maize plants (τ=0.45 ns). This shortening in the chlorophyll fluorescence decay was accompanied by an increase in the nonphotochemical quenching (qNP). The photochemical quenching (qP) and therefore the electron transport via photosystem II remains unaffected by water stress. The most pronounced effect of the stress for both plant types was a decrease inP N due to a closure of the stomata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01211212
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  • 5
    Electronic Resource
    Electronic Resource
    Inheritance of resistance in cucumber to race 2 of Colletotrichum lagenarium (1990)
    Springer
    Theoretical and applied genetics 79 (1990), S. 13-16 
    Details
    ISSN: 1432-2242
    Keywords: Cucumis sativus ; Anthracnose ; Disease resistance ; Quantitative inheritance ; Vegetable breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The resistant breeding line, AR79-95, and the susceptible cultivar, Model, were crossed to develop F1, F2, F3, and backcross populations for genetic analysis of resistance in cucumbers to race 2 of Colletotrichum lagenarium (Pass.) Ellis & Halsted., the causal agent of cucurbit anthracnose. There was no maternal effect on resistance and a small amount of F1 heterosis toward the susceptible parent. Generation means analysis showed that there was additive and dominance but no epistatic gene action detected on the scale used. Additive and dominance genetic variances were estimated, and narrow-sense heritability was low to moderate. Based on effective factor formulae, at least five effective factors contrtolled the resistance. Some of these factors were dominant and others recessive. Implications for breeding procedures are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223780
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