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  • 1
    Digitale Medien
    Digitale Medien
    Courtship and Mating in the Giant Hairy Desert Scorpion, Hadrurus arizonensis (Scorpionida, Iuridae) (2000)
    Springer
    Journal of insect behavior 13 (2000), S. 827-838 
    Details
    ISSN: 1572-8889
    Schlagwort(e): scorpion ; mating behavior ; Hadrurus arizonensis ; courtship ; reproduction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Hadrurus arizonensis is a large, long-lived species of North American desert scorpion with lengthy, stereotyped courtship behaviors that lead to sperm transfer via an external spermatophore. Courtship and mating behaviors in H. arizonensis and other members of the Iuridae family have not been described. H. arizonensis has reproductive behavior similar to that of other scorpions, including the promenade a deux, but with some unique components described here for the first time. Courtship and mating behaviors of H. arizonensis are presented in a flowchart to emphasize its stereotypical nature and suitability for experimental manipulation in field and laboratory studies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007858400402
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of cardiac innervation in the nudibranch, Archidoris montereyensis (1990)
    Springer
    Journal of comparative physiology 167 (1990), S. 51-60 
    Details
    ISSN: 1432-1351
    Schlagwort(e): Cardiac innervation ; Nudibranch ; Archidoris montereyensis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The heart of the nudibranch mollusc Archidoris montereyensis is regulated by a small number of powerful effector neurons located in the right pleural and visceral ganglia. Two identifiable neurons in the pleural ganglion, a heart excitor (plHE) and a heart inhibitor (PlHI), are especially important regulators of cardiac function in that low levels of spontaneous activity in either cell significantly alters the amplitude and rate of heart contractions. These neurons have extensive dendritic arbors within the right pleural ganglion and branching axonal processes within the visceral ganglion. The visceral ganglion also contains a heart excitor neuron (VHE) and at least two heart inhibitor neurons (VHI cells), but their influence on cardiac activity is weaker than that of the pleural ganglion cells. All of these heart effector cells appear to be motor neurons with axons that terminate predominately in the atrio-ventricular valve region of the heart via the pericardial nerve. The simplicity and strength of these neuronal connections to the heart of Archidoris make this a favorable preparation for studies of cardiac regulation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00192405
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  • 3
    Digitale Medien
    Digitale Medien
    Differential hormonal action of the bag cell neurons on the arterial system ofAplysia (1985)
    Springer
    Journal of comparative physiology 157 (1985), S. 31-37 
    Details
    ISSN: 1432-1351
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The peptide-secreting bag cell neurons ofAplysia californica activate a long-lasting, complex behavior called egg laying. During egg laying some organ systems (reproductive) are more active than others (digestive) suggesting that blood flow to these tissues may change in accordance with their activities during egg laying. To examine this possibility we used a semi-intact preparation of the three major arteries innervated by the abdominal ganglion. We found that electrically stimulated bursts of bag cell activity triggered a long-lasting (〉1 h) increase in contractile activity in two arteries, the anterior and gastroesophageal, but did not affect contractions of the third (abdominal) artery. The arterial responses were not affected either in form or duration by denervation of the arteries, suggesting that the increase in contractile activity was mediated by hormonal actions of bag cell transmitters on vasoconstrictor muscles. In intact animals this differential action on the arterial system may cause a long-term decrease in blood flow to relatively inactive tissues (digestive and locomotory organs) while increasing circulation to tissues involved in egg production (ovotestis and oviduct).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00611092
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  • 4
    Digitale Medien
    Digitale Medien
    Water detection in the desert sand scorpion, Paruroctonus mesaensis (Scorpionida, Vaejovidae) (1992)
    Springer
    Journal of comparative physiology 170 (1992), S. 623-629 
    Details
    ISSN: 1432-1351
    Schlagwort(e): Scorpion ; Water ; Chemoreception ; Behavior ; Electrophysiology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary For the sand scorpion, Paruroctonus mesaensis, substrate moisture is a powerful and fast-acting stimulus of discrete behaviors related to localization and imbibitory uptake of water. These behaviors are readily observed in the field and quantified in the laboratory when free-roaming animals encounter sand substrates dampened by small amounts of water. Of 10 behaviors we monitored in laboratory tests, 5 (pedipalp-pull, rototiller-digging, prolonged stops, headstand, and backingup) occurred only after contact with a moistened substrate. These water-stimulated behaviors were selectively blocked when all 8 tarsal leg segments were coated with wax; coverings of the chemosensory pectine appendages had little to no effect. Electrophysiological recordings from chemoreceptor organs on the tarsi showed that neurons innervating the dorsal tarsal organ, were highly sensitive to humid air stimuli while the numerous, poretipped hairs on the ventral surface were responsive to aqueous solutions applied directly to their tips. Selective blocking of the 8 tarsal organs had no effect on water sensitive behavior indicating that the chemosensory hairs mediate detection of substrate moisture. Such localized, sensory triggering of a robust and directed behavior presents a useful model for further neuroethological studies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00199338
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  • 5
    Digitale Medien
    Digitale Medien
    Activity-related changes in protein phosphorylation in an identifiedAplysia neuron (1985)
    Springer
    Cellular and molecular neurobiology 5 (1985), S. 321-331 
    Details
    ISSN: 1573-6830
    Schlagwort(e): protein phosphorylation ; peptidergic neurons ; cyclic AMP ; phosphodiesterase inhibitor ; neuronal excitability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary 1. The relationship between long-term electrical activity and protein phosphorylation was investigated in single, identifiable neurons in the abdominal ganglion ofAplysia californica by the intracellular injection of radiolabeled ATP followed by sodium dodecyl sulfate (SDS) gel electrophoresis. 2. Natural and pharmacological treatments that alter the impulse activity of neurons L6 and R15 for prolonged periods did not appear to affect the phosphorylation of most of the 15 major phosphoproteins examined in these cells. 3. Long-term excitation of L6 induced by the phosphodiesterase inhibitor IBMX correlated with phosphorylation of a 29,000-dalton protein. Long-term inhibition of L6 induced by afterdischarge of peptidergic bag-cell neurons appeared to cause dephosphorylation of a 29,000-dalton protein. 4. Burst augmentation of R 15 induced by bag-cell afterdischarge did not cause detectable changes in the phosphorylation of the major proteins we examined. 5. These data are consistent with other studies of neural and nonneural tissues which have found a correlation between activity and the level of phosphorylation of a 29,000-dalton protein.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00755399
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