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  • 1
    Electronic Resource
    Electronic Resource
    Ryanodine-sensitive intracellular Ca2+ stores in isolated rabbit penile erectile tissue (1995)
    Springer
    Urological research 22 (1995), S. 393-398 
    Details
    ISSN: 1434-0879
    Keywords: Penile erection ; Smooth muscle ; Calcium channel blocker ; Intracellular calcium ; Ryanodine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Norepinephrine release from adrenergic nerve terminals leads to a rise in intracellular Ca2+, which promotes penile smooth muscle contraction and detumescence. Ca2+ sources are the extracellular space and sarcoplasmic Ca2+ stores. To elucidate the role of intracellular stores strips from rabbit erectile tissue were investigated in an organ bath study. Contractions were elicited by phenylephrine (PE) and electrical stimulation. Incubation in Ca2+-free solution as well as exposure to nifedipine did not abolish electrical or PE-induced contraction. Ryanocline (10-5 mol/l), a functional blocker of sarcoplasmic Ca2+ channels, significantly reduced PE response. In the presence of caffeine (10-3 mol/l) the effect was significantly enhanced. Addition of nifedipine nearly abolished the contraction. These results provide evidence for intracellular Ca2+ pools in cavernosal tissue and indicate that the α1-adrenoceptor-induced contraction requires the opening of voltage-gated Ca2+ channels and the release of Ca2+ from intracellular stores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296883
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Variable effects of iodinated contrast media on different rabbit arteries in vitro (1997)
    Springer
    Urological research 25 (1997), S. S21 
    Details
    ISSN: 1434-0879
    Keywords: Iodinated contrast media ; Diatrizoate ; Iohexol ; Isolated arteries ; Organ bath Vasoconstriction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Vasoconstriction caused by iodinated contrast media (CM) has been considered specific for the renal artery only. We examined the vascular effect of CM in rabbit carotid, aorta, renal, iliac, mesenteric and celiac arteries and found that other arteries also respond with a contraction to CM. Isolated arterial rings were exposed to diatrizoate (high osmolar CM), iohexol (low osmolar CM) or glucose solution, and the isometric contraction response was expressed as percentage of an initial KCl control contraction. Diatrizoate evoked contractions of 82% (carotid), 63% (aorta), 30% (renal), 24% (iliac), 28% (mesenteric) and 18% (celiac), respectively. Iohexol caused contractions of 31% (carotid), 24% (aorta), 15% (renal) and 14% (iliac), whereas the mesenteric and celiac arteries were relaxed by iohexol. A high osmolar glucose solution elicited contractions of 78%, 77%,11%, 27%, 3% and 5%, respectively, in the arteries. CM have contraction potency in arterial vasculature other than the renal artery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00942043
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photoemission of spinpolarized electrons from strained GaAsP (1996)
    Springer
    Applied physics 63 (1996), S. 203-206 
    Details
    ISSN: 1432-0630
    Keywords: 79.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Strained layer GaAs.95P.05 photo cathodes are presented, which emit electron beams spinpolarized to a degree of P = 75% typically. Quantum yields around QE = 0.4% are observed routinely. The figure of merit P2 × QE = 2.3 × 10−3 is comparable to that of the best strained layer cathodes reported in literature. The optimum wavelength of irradiating light around 830 nm is in convenient reach of Ti:sapphire lasers or diode lasers respectively. The cathodes are produced using MOCVD-techniques. A GaAs.55P.45-GaAs.85P.15 superlattice structure prevents the migration of dislocations from the substrate and bottom layers to the strained overlayer. The surface is protected by an arsenic layer so that no chemical cleaning is necessary before installation into vacuum. The source of polarized electrons attached to the Mainz race track microtron MAMI works with such cathodes now. More than 1000 hours beamtime have been performed successfully.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567651
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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