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  • 1
    ISSN: 1573-4994
    Keywords: Fluorescent probe ; ultrafast spectroscopy ; barrierless twisting ; charge shift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The quenching of Auramine fluorescence in ethanol is studied by two ultrafast spectroscopy techniques. The gain band, probed by transient absorption spectroscopy, vanishes in a few picoseconds, while a transient absorption band rises and the ground-state repopulation is delayed. In up-conversion experiments, nonexponential wavelength-dependent fluorescence decays are observed. The average decay times increase with the wavelength and the reconstructed instantaneous spectrum exhibits a few hundred-wavenumber red shift and a broadening while its intensity drops. The previously proposed relaxation model, involving a barrierless internal twisting motion toward a transient dark state, is further examined. In particular, the extinction coefficients of the transient state are extracted from the differential absorption spectra. The band is found to lie in the same wavelength range as the dimethylaniline cation radical. This result is discussed as a possible support for an internal twisting process involving a charge shift.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Biology and philosophy 15 (2000), S. 669-698 
    ISSN: 1572-8404
    Keywords: analogy ; biological systems ; causation ; complexity ; emergent materialism ; hierarchy ; human sociobiology ; information ; metaphor ; methodological reduction ; ontological reduction ; part-whole relations ; physical systems ; religion and science ; self-organization ; social systems ; theory constitution ; theory reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Philosophy
    Notes: Abstract I claim that explanations of human behaviour by Edward O. Wilsonand Charles Lumsden are constituted by a religiously functioningmetaphysics: emergent materialism. The constitutive effects areidentified using six criteria, beginning with a metaphorical re-description of dissimilarities between levels of organization interms of the lower level, and consist of conceptual andexplanatory reductions (CER). Wilson and Lumsden practice CER,even though CER is not required by emergent materialism. Theypreconceive this practice by a re-description which conflates thelevels of organization and explain failure of CER in terms oftechnical, not ontological or epistemological reasons. Iinterpret these three practices as a reaction of Wilson againsthis early Christian religious beliefs. Statements by Wilsonindicate this reaction ultimately constitutes his explanations ofsocial, moral and religious behaviour. Tested knowledge about matter at the lower level functions as ametaphysical belief when applied to the higher level becausethere it is untested. I offer twelve criteria for the diagnosisof religious functions of this metaphysical materialism, five ofwhich are satisfied. I show that the constitutive effects of thismaterialism in sociobiology are due to its religious functions,are beneficial for science and do not destroy its public nature.
    Type of Medium: Electronic Resource
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