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  • 42.80  (1)
  • Suppressor mutations  (1)
  • Springer  (2)
  • 1985-1989  (2)
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  • Springer  (2)
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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Calorimetric absorption spectroscopy of J-aggregate dye monolayers below 0.1 Kelvin (1985)
    Springer
    Applied physics 38 (1985), S. 199-203 
    Details
    ISSN: 1432-0649
    Keywords: 42.80 ; 35 ; 07
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe an extremely sensitive method to investigate nonradiative processes following optical excitation. In a low-temperature calorimeter, the sample is irradiated with monochromatic light. The absorbed energy which is converted into phonons leads to a measurable increase of the sample temperature. The lowest detectable dissipated energy is 2·10−12J at a working temperature of 0.03 K. We demonstrate our method with a calorimetric absorption spectrum of J-aggregate monolayers of 1-methyl-1′-octadecyl-2,2′-cyanine. From this spectrum the emission quantum efficiency is obtained as a function of excitation wavelength. A relative minimum is found at the long wavelength edge of the absorption band at 582.5 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697484
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  • 2
    Electronic Resource
    Electronic Resource
    Third chromosome suppressor of position-effect variegation loci in Drosophila melanogaster (1986)
    Springer
    Molecular genetics and genomics 202 (1986), S. 481-487 
    Details
    ISSN: 1617-4623
    Keywords: Position-effect variegation ; Suppressor mutations ; Chromosome 3 ; Heterochromatin ; Drosophila melanogaster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary As a result of a genetic analysis of 63 third chromosome suppressor mutations of position-effect variegation 12 different loci showing dominant suppression have been identified and their map positions determined. A compilcation of the genetic data available for each suppressor locus is given. The strong suppressor effects of the mutations have been quantified by measurements of white variegation inw m4h /w m4h ,w m4h /Y andw m4h /O flies. Mutant alleles of three loci were found in these studies to dominate over the strong enhancer effect of complete loss of the Y chromosome. Most of the identified loci suppressing position-effect variegation represent essential genetic funtions; only three loci represent nonessential functions. Mutations of two loci display recessive butyrate sensitivity and lethal interaction with the heterochromatic Y chromosome suggesting that these genes affect chromosomal condensation. Studies with deficiencies and triploids revealed that most of the loci represent haplo-abnormal suppressor functions. The use of the isolated mutant material for genetic, developmental and molecular studies of processes connected with gene inactivation in position-effect variegation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333281
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