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  • 1
    Electronic Resource
    Electronic Resource
    Peptide attraction of hermit crabsClibanarius vittatus Bosc: Roles of enzymes and substrates (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 2347-2365 
    Details
    ISSN: 1573-1561
    Keywords: Hermit crabs ; Busycon carica ; Clibanarius vittatus ; peptide attractants ; salivary glands ; proteases ; shell cues
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Hermit crabs are obligate users of gastropod shells. Shell availability is often the limiting factor for crab population size. Crabs have an extensive behavioral repertoire for obtaining shells. Here we extend our studies of the chemical ability of crabs to locate the shells of dead and dying gastropods from a distance. We show that peptide cues generated by the action of specific proteases on specific substrates attract crabs. The specificity of the crab response is dependent upon the type of substrate as well as the suit of enzymes attacking the substrate. Single specific enzymes are not as effective as mixtures of enzymes in generating cues from pure (and totally foreign) substrates such as ovalbumin. However, the activation of trypsinogen by enterokinase yields only a single hexapeptide and results in potent crab attraction. We conclude that the specific sequence of the peptide determines attraction. Thus, the key to crab attraction is the presence of a particular sequence in a substrate and the ability of enzymes or mixtures of enzymes to release that sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994587
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  • 2
    Electronic Resource
    Electronic Resource
    1,2,3,4-Tetra-tert-butyl-4-trimethylsilyl-4-sila-2-cyclobuten-1-yl: A Quantum Mechanical and ESR Study (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1107-1112 
    Details
    ISSN: 1434-193X
    Keywords: Photochemistry ; Radicals ; EPR spectroscopy ; Quantum mechanical calculations ; Silicon compounds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -Trisilane 7 has been synthesized as a potential photochemical precursor of tetra-tert-butylsilatetrahedrane (5) and/or tetra-tert-butylsilacyclobutadiene (6). Astonishingly, only one Si,Si bond is broken upon irradiation of 7 and the silacyclobutenyl radical 9 can be identified as the reaction product. The structure of radical 9, which in the absence of oxygen is persistent even at room temperature, has been elucidated by comparison of its experimental and calculated ESR spectra.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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