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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 765-773 
    ISSN: 0392-6737
    Keywords: Muscle contraction, nerve conduction, synaptic transition memorization and other neurophysiological processes (excluding perception processes and speech) ; Biophysical instrumentation and techniques ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Two procedures aimed at a synthetic, quantitative characterization of the integrative activity in a small system of nerve cells are proposed, and applications to the buccal ganglion of the molluskAplysia are described. Both methods are based on cross-correlation evaluation. The first method processes intracellular signals simultaneously recorded from pairs of neurones, and reveals and measures the occurrence of shared synaptic input. The second method processes extracellular multiunit signals recorded by two cuff electrodes placed around one nerve, and evaluates the impulse traffic, subdivided according to direction and speed of propagation. The outcome of both methods may be used to represent the state of the system, and may provide a basis to further studies on its dynamics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7284
    Keywords: Human hepatitis A virus ; T1oligonucleotide fingerprinting ; Genomic stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Three human hepatitis A virus strains, all of them isolated in Italy but one acquired abroad, were analyzed by T1 - RNAase oligonucleotide mapping and by monoclonal antibody neutralization. The variation among their genomes according to T1 - maps was calculated to be about 9%, thus confirming the poor genomic variation assessed by nucleotide sequencing (1 – 10%). However T1 - maps of these Italian isolates were different from those reported in the literature (Weitz and Siegl, 1985). Neutralization by monoclonal antibody caused a reduction in titres of 2 – 2.5 log10. This genomic stability, if confirmed, is important with a view to a valuable vaccine.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-601X
    Keywords: 25.70 Gh ; 24.30 Cz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Continuumγ- ray spectra from the decay of59Cu formed at an excitation energy of 100 MeV and angular momenta up to 43ħ by means of the reaction 190 MeV32S +27Al have been measured and analyzed. The parameters of the Giant Dipole Resonance (GDR) have been extracted using the statistical model. The derived GDR width confirms the sizeable broadening of this resonance in59Cu already reported in our earlier investigation at 77 MeV excitation energy (Jcrit=38ħ). Estimates of the GDR width have been performed in the adiabatic approximation. Predicted values account qualitatively for the experimental data of59Cu as well as of the heavier isotope63Cu, in which the broadening was not seen up to 77MeV excitation (Jcrit=35ħ). The present analysis demonstrates the strong sensitivity of the GDR to spin effects in this mass region.
    Type of Medium: Electronic Resource
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