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  • Articles: DFG German National Licenses  (3)
  • Electronic Resource  (3)
  • Blood flow  (1)
  • Buccinum undatum  (1)
  • Flora of southern Africa  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Cardiac output and muscle blood flow in exercising dogs
    Amsterdam : Elsevier
    Respiration Physiology 61 (1985), S. 317-326 
    Details
    ISSN: 0034-5687
    Keywords: Blood flow ; Cardiac outpu ; Exercise ; Microsphere trapping ; Muscle ; Oxygen consumption
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0034-5687(85)90074-X
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Do pollinators determine hybridization patterns in sympatricSatyrium (Orchidaceae) species? (1999)
    Springer
    Plant systematics and evolution 219 (1999), S. 137-150 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Satyrium ; pollination ; hybridization ; genetic barriers ; floral isolation ; Flora of southern Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The breakdown of species integrity was studied in three sympatricSatyrium (Orchidaceae) species at a site in the Western Cape province of South Africa. Hybrids with intermediate morphology were identified using multivariate analysis.Satyrium erectum ×S. bicorne andS. erectum ×S. coriifolium hybrids were common, while only oneS. bicorne ×S. coriifolium hybrid was found (a new record). Reciprocal artificial crossing experiments confirmed that genetic compatibility exists between all three species. However, the species have different pollinators: moths inS. bicorne, bees inS. erectum and sunbirds inS. coriifolium. Pollinators, rather than genetic factors, therefore, appear to be responsible for reproductive isolation between these species. Breakdown in pollinator specificity results in interspecific pollen transfer and the formation of hybrids. Overlap in floral signals, including nocturnal scent in bothS. erectum andS. bicorne, and bright coloration in bothS. erectum andS. coriifolium, facilitates the formation of hybrids between these species pairs. The brown, scented flowers ofS. bicorne, on the other hand, share no obvious floral signals with the bright orange, unscented flowers ofS. coriifolium, accounting for the rarity of hybrids between this species pair. Differences in floral morphology also result in mechanical isolation between these two species. Since the three species are sympatric in a very small part of their geographic ranges, it is unlikely that avoidance of hybridization has been an important selective factor in the evolution of specialized pollination systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985575
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Excitation evoked by FMRFamide and FLRFamide in the heart of Buccinum undatum and evidence for inositol 1,4,5-trisphosphate as an RF-tetrapeptide second messenger (2000)
    Springer
    Journal of comparative physiology 170 (2000), S. 351-356 
    Details
    ISSN: 1432-136X
    Keywords: Key words Atrium ; Buccinum undatum ; FLRFamide ; FMRFamide ; Perfused ventricle ; AbbreviationsFLRFamide phenylalanine-leucine-arginine-phenylalanine-NH2 ; FMRFamide phenylalanine-methionine-arginine-phenylalanine-NH2 ; GTP guanosine triphosphate ; 5-HT 5-hydroxytryptamine ; IP3 inositol 1,4,5-trisphosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In this study the relative potencies of four established molluscan cardioexcitatory agents were examined on Buccinum heart. The potencies were, in decending order: phenylalanine-leucine-arginine-phenylalanine-NH2 (FLRFamide) 〉 phenylalanine-methionine-arginine-phenylalanine-NH2 (FMRFamide; 80% of maximum) 〉 5-hydroxytryptamine (5HT; 60% of maximum) 〉 guanosine triphosphate (GTP; 15% of maximum). FMRFamide and FLRFamide had similar dose-response curve patterns with thresholds at 10−9 mol l−1 but FLRFamide was more potent than FMRFamide. The superfused atrium was much less sensitive to all agonists than the internally perfused ventricle. FLRFamide and FMRFamide induced small depolarizations (1–2 mV) which triggered a burst of action potentials of about 5 mV which on reaching 4 mV triggered a burst of fast twitch contractions. Lithium, at high concentrations inhibited FMRFamide and 5-HT responses of internally perfused ventricles. Neomycin also inhibited peptide responses, but was without effect on 5-HT responses. Heparin, however, for technical reasons was without effect on ventricular responses to all three agonists. FMRFamide and FLRFamide appear to share a common receptor, the potency difference being due to the substitution of leucine for methionine in FLRFamide. The RF N-terminal sequence appears crucial for receptor activation. The Phospholipase C inhibitor neomycin equally inhibits responses to the two peptides while 5-HT responses are unaffected. This implicates a peptide/receptor interaction which activated inositol 1,4,5-trisphosphate (IP3) as a second messenger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003600000110
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    Paper (German National Licenses)
    Fulltext
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