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  • 1
    Electronic Resource
    Electronic Resource
    Scheibe-aggregates of Pseudoisocyanine in solution and in molecular monolayers (1987)
    Springer
    Applied physics 43 (1987), S. 167-172 
    Details
    ISSN: 1432-0649
    Keywords: 33.50 ; 78.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fluorescence lifetimes of Scheibe-aggregates of Pseudoisocyanine chloride (PIC) in aqueous solution and of the PIC derivative 1-methyl-1′-octa-decyl-2,2′-cyanine perchlorate in stacks of molecular monolayers produced on glass substrates using the Langmuir-Blodgett technique have been measured. The decays are non-exponential and lifetimes depent on sample composition. Fluorescence lifetimes of the short-lived component in assemblies of 40 dye monolayers show a non-normal temperature dependence: τ293K=8.2 ps and τ143K=5.5 ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695618
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  • 2
    Electronic Resource
    Electronic Resource
    Suppressor mutation of position-effect variegation in Drosophila melanogaster affecting chromatin properties (1986)
    Springer
    Chromosoma 93 (1986), S. 398-403 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The dominant mutation Su-var(2)1 01 which suppresses position-effect variegation and displays recessive butyrate sensitivity was found to result in significant hyperacetylation of histone H4. This biochemical finding, as well as the genetic properties of this mutation, strongly suggest that the wild-type product of the corresponding locus is involved in histone H4 deacetylation. In larvae containing the suppressor mutation the accessibility of chromatin to endogenous nucleases is significantly increased which might be causally connected with histone H4 hyperacetylation. The suppressor mutation Su-var(2)1 01 has, therefore, to be classified as a chromatin condensation mutation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285820
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Ecdysteroid-dependent larval-adult oviduct transformation in the milkweed bugOncopeltus fasciatus requires absence of juvenile hormone (1987)
    Springer
    Cellular and molecular life sciences 43 (1987), S. 1115-1117 
    Details
    ISSN: 1420-9071
    Keywords: Insect oviduct ; larval-adult transformation ; juvenile hormone ; Oncopeltus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary It has been tested whether juvenile hormone plays a role in the larval-adult transformation of lateral oviducts in the milkweed bug. The transformation is ecdysteroid-dependent, as was reported previously2. Application of precocene or juvenile hormone III proved that the absence of juvenile hormone is required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01956055
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  • 5
    Electronic Resource
    Electronic Resource
    Open bosonic strings in general background fields (1986)
    Springer
    The European physical journal 32 (1986), S. 599-607 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the renormalization properties of the 2 dim. field theory describing an open bosonic string in the background fields corresponding to its massless excitations. The relevant β-functions are calculated for gravitational, antisymmetric tensor and Yang-Mills background on 1-loop level, for pure Yang-Mills background an 2-loop level and in the Abelian case up to 3 loops. We find a renormalization scheme dependence starting at 2 loop order. Putting β to zero yields the equation of motion for the non-linear electrodynamics of Fradkin and Tseytlin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550785
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  • 6
    Electronic Resource
    Electronic Resource
    On spin dependent potentials in supersymmetric QCD (1985)
    Springer
    The European physical journal 29 (1985), S. 411-422 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Starting from the supersymmetric extension of the nonabelian path dependent phase factor we try to get an understanding of the physical role of its components. We extend to SUSY-QCD (broken or unbroken) the technique of expanding the quark propagator in gauge field background in terms of inverse powers of quark mass which has been used earlier by Eichten and Feinberg to study spin dependent quark potentials in QCD. The contribution to the $$Q\bar Q$$ potential induced by gluino exchange is expressed in terms of gluino insertions into the Wilson loop. A rough quantitative estimate is given on the basis of perturbation theory. Finally the extension to the $$S\bar Q$$ and 3Q system is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01565190
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of SOC for the presumptive identification of Candida albicans and Cryptococcus neoformans (1987)
    Springer
    Mycopathologia 97 (1987), S. 25-31 
    Details
    ISSN: 1573-0832
    Keywords: medium ; morphology ; yeast ; SOC ; germ tube ; chlamydospore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract SOC, a fungal growth medium composed of SolrythR, oxgall, and caffeic acid, was evaluated as a medium to provide rapid, differential identification of Candida albicans and Cryptococcus neoformans. Using a variety of common isolation media to produce the yeast inocula, the germ tube methods tested ranked in the following order of decreasing sensitivity: SOC (97%±1), serum (92%±5), rabbit coagulase plasma with EDTA in combination with tryptic soy broth (89%±5), TOC (89%±6), and rabbit coagulase plasma with EDTA (83%±4). In chlamydospore production, SOC also proved to be the most sensitive after 24 h incubation: SOC (96%±2), TOC (80%±2), and cornmeal-Tween 80 agar (14%±3). Other medically important yeasts showed normal patterns of growth within 24 h on SOC, thus assisting in their identification.Eighty strains of Cryptococcus neoformans showed characteristic brown pigmentation on SOC and TOC within 18 h, while all other species of the genus Cryptococcus and 229 Candida isolates did not show a change in pigmentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437327
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  • 8
    Electronic Resource
    Electronic Resource
    Why Popper's basic statements are not falsifiable some paradoxes in Popper's “Logic of scientific discovery” (1988)
    Springer
    Journal for general philosophy of science 19 (1988), S. 124-143 
    Details
    ISSN: 1572-8587
    Source: Springer Online Journal Archives 1860-2000
    Topics: Philosophy , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Zusammenfassung Basissätze spielen eine zentrale Rolle in Poppers “Logik der Forschung”, denn sie erlauben die Unterscheidung zwischen empirischen und nichtempirischen Theorien: Eine Theorie ist empirisch genau dann, wenn sie aus falsifizierbaren Aussagesätzen besteht, und Aussagesätze (beliebiger Art) sind falsifizierbar genau dann, wenn sie mindestens einem Basissatz widersprechen. Popper setzt offensichtlich voraus, daß die Basissätze selbst empirisch und somit falsifizierbar sind. Jedenfalls behauptet er mehrmals ihre Falsifizierbarkeit. Wir beweisen in unserem Aufsatz, daß die Basissätze nicht falsifizierbar sind, und wir beweisen dies nicht nur für Poppersche Basissätze im engeren Sinn, sondern auch für Poppersche Basissätze im weiteren Sinn und schließlich für Poppersche Basissätze im weitesten, mit den Vorstellungen Poppers gerade noch verträglichen Sinn. Dies führt zu dem paradoxen Ergebnis, daß nach Poppers eigenen methodologischen Postulaten die Basis der empirischen Wissenschaften nicht selbst empirisch ist. Darüber hinaus entwickeln wir ein ähnliches Paradoxon bezüglich Poppers Falsifizierbarkeitsschema für Theorien. Zum Abschluß unseres Aufsatzes betrachten wir einige Möglichkeiten, die von uns entdeckten Paradoxa zu überwinden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01801380
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  • 9
    Electronic Resource
    Electronic Resource
    Improved secondary ion mass spectral sensitivity for adenosine triphosphate disodium salt (1986)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 325 (1986), S. 626-627 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00488314
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  • 10
    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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