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  • 1990-1994  (4)
  • Catch-relaxing peptide (CARP)  (2)
  • ABRM  (1)
  • Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Comparative aspects of structure and action of molluscan neuropeptides (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 448-456 
    Details
    ISSN: 1420-9071
    Keywords: Neuropeptide ; Mollusca ; ABRM ; Mytilus ; Achatina ; Helix ; d-amino acid residue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A number of neuropeptides were isolated from the ganglia and muscles of molluscs, and their actions were examined. Diverse neuropeptides, in addition to several classical neurotransmitters, were suggested to be involved in the regulation of the anterior byssus retractor muscle ofMytilus. A wide structural variety of members of theMytilus inhibitory peptide family was observed in each of the generaMytilus, Achatina andHelix. Gly-Trp-NH2, the C-terminal dipeptide fragment of the neuropeptide AGPWamide, showed a more potent action than the parent peptide in all of the muscles examined. Peptides related to some molluscan neuropeptides were found to be distributed interphyletically. Some neuropeptides containing ad-amino acid residue were found inAchatina andMytilus. These aspects of molluscan neuropeptides are thought not to be exceptional.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01928163
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Action and immunoreactivity of neuropeptides in the buccal neuromuscular system of a prosobranch mollusc, Rapana thomasiana (1991)
    Springer
    Cell & tissue research 264 (1991), S. 57-62 
    Details
    ISSN: 1432-0878
    Keywords: FMRFamide ; Catch-relaxing peptide (CARP) ; Radula muscle ; Immunohistochemistry ; Rapana thomasiana (Mollusca)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In a prosobranch mollusc, Rapana thomasiana, the catch-relaxing peptide H-Ala-Met-Pro-Met-Leu-Arg-Leu-NH2 (CARP) was found to depress the contraction of the radula protractor and retractor elicited by electrical stimulations. The action of CARP was in contrast to that of other neuropeptides, H-Phe-Met-Arg-Phe-NH2 (FMRFamide) and H-Phe-Leu-Arg-Phe-NH2 (FLRFamide), which enhanced the contraction of the radula protractor and retractor, respectively. By immunohistochemical examinations, FMRFamide-like immunoreactive neurons were found on the rostral side of the right buccal ganglion and the caudal side of the left ganglion, where some CARP-like immunoreactive neurons were also distributed, indicating a possible coexistence of FMRFamide and CARP. FMRFamide- and CARP-like immunoreactivities were also detected in the neuropile of buccal ganglia, radula nerves arising from the ganglia, and nerve fibers in the radula muscles. The present results suggest that FMRFamide- and CARP-like peptides are involved in the regulation of the contraction of the radula muscles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305722
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Neuropeptides regulate the cardiac activity of a prosobranch mollusc, Rapana thomasiana (1992)
    Springer
    Cell & tissue research 269 (1992), S. 241-247 
    Details
    ISSN: 1432-0878
    Keywords: FMRFamide ; Catch-relaxing peptide (CARP) ; Heart beat ; Immunohistochemistry-Rapana thomasiana (Mollusca)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Involvement of neuropeptides in the regulation of cardiac activity in a prosobranch mollusc, Rapana thomasiana, was studied physiologically as well as immunohistochemically. A catch-relaxing peptide (CARP) showed strong inhibitory effects on the heart with a lower threshold than acetylcholine. The action of CARP was in contrast to that of another neuropeptide, FMRFamide, which has previously been shown to enhance the heart beat. Benzoquinonium blocked the effects of acetylcholine and stimulation of right cardiac nerves 1 and 3b, but not those of CARP, suggesting that the effects of nerve stimulation are mainly due to the release of acetylcholine. Immunohistochemical examinations demonstrated that FMRFamide-like and CARP-like immunoreactive neurons are distributed in the visceral ganglia. Although a neuron appeared to show weak immunoreactivity to both antisera, evidence for the coexistence of peptides in a single neuron was not exhibited. Positive immunoreactivity to FMRFamide and CARP antisera also appeared in right cardiac nerves 1 and 3. In the heart, FMRFamide- and CARP-like immunoreactive fibers were restricted to the atrium and the aortic end of the ventricle, consistent with the morphological observation of innervation. The present results suggest that FMRFamide- and CARP-like peptides are involved in regulating the heart beat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319615
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular dimensions and chain conformation in glassy syndiotactic polystyrene (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 881-885 
    Details
    ISSN: 0887-6266
    Keywords: glassy syndiotactic polystyrene ; small-angle neutron scattering ; chain conformation ; radius of gyration ; characteristic ratio ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: For the first time the small-angle neutron scattering (SANS) from mixtures of protonated and totally deuterated syndiotactic polystyrene (sPS) has been studied. Two amorphous samples with similar molecular weights have been measured at various concentrations of the protonated part. All measurements were performed at room temperature using the scattering equipment of two different laboratories. The molecular weight Mw evaluated from SANS data agreed with those obtained by gel permeation analysis (GPC). In the Kratky representation the scattering contribution due to the contrast scattering shows a plateau behavior up to q = 0.45 Å-1, where q is magnitude of the scattering vector. This observation is in evident contrast to what is expected from the rotational isomeric state (RIS) model. In addition the characteristic ratios C∞, derived either from the plateau height or from radii of gyration of the Zimm regime and being in reasonable agreement with each other, show strong deviations from the predictions of the RIS model. © 1994 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320511
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    Paper (German National Licenses)
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