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  • 1
    Electronic Resource
    Electronic Resource
    Relative contributions of ATP and noradrenaline to the nerve evoked contraction of the rabbit jejunal artery (1992)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 345 (1992), S. 424-430 
    Details
    ISSN: 1432-1912
    Keywords: Rabbit jejunal artery ; Contraction ; Cotransmission ; ATP ; Noradrenaline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Isotonic contractions of the rabbit jejunal artery were evoked by perivascular nerve stimulation with trains of 10 or 100 stimuli at 2 Hz or 10 Hz. Short trains of stimuli elicited contractions that were totally resistant to α-adrenoceptor blockade (0.1 μmol/l prazosin) but blocked by α,β-methylene ATP (1 μmol/l). A substantial noradrenergic component of contraction comprising about 50% of the total could be evoked by adjusting the stimulation parameters (increasing the frequency and/or number of stimuli in a train). The noradrenergic and the purinergic components are derived from sympathetic nerves as both were blocked by TTX and the adrenergic neurone blocker guanethidine (3 μmol/l). It is concluded that the contraction of the rabbit jejunal artery to short trains of stimuli is predominantly purinergic, a nor-adrenergic component only being revealed at higher frequencies of stimulation or during longer trains of stimuli. The purinergic component of contraction is derived from sympathetic nerves and not from a separate population of purinergic nerves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176620
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optimal filter design subject to output sidelobe constraints: Computational algorithm and numerical results (1974)
    Springer
    Journal of optimization theory and applications 14 (1974), S. 271-290 
    Details
    ISSN: 1573-2878
    Keywords: Detection theory ; estimation theory ; sidelobe constraints ; convex programming ; duality theory ; gradient methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An algorithm is presented for the design of optimal detection filters in radar and communications systems, subject to inequality constraints on the maximum output sidelobe levels. This problem was reduced in an earlier paper (Ref. 1) to an unconstrained one in the dual space of regular Borel measures, with a nondifferentiable cost functional. Here, the dual problem is solved via steepest descent, using the directional Gateaux differential. The algorithm is shown to be convergent, and numerical results are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00932611
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    Paper (German National Licenses)
    Fulltext
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