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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructure of exocrine prothoracic gland ofDatana ministra (Drury) (Lepidoptera: Notodontidae) and the nature of its secretion (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 2039-2050 
    Details
    ISSN: 1573-1561
    Keywords: Datana ministra ; Lepidoptera ; Notodontidae ; exocrine prothoracic gland ; ultrastructure ; dispersal pheromone ; dodecanol ; dodecyl acetate ; dodecyl formate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Datana ministra larvae possess a gland situated in the ventral anterior portion of the prothorax. The gland consists of a single sac and is only charged with secretion in the last instar. Its orifice, a simple slit, opens into a transverse invagination of the integument in the cervical margin of the prosternite. The components of the gland have been identified by GC and GCMS and have been shown to be dodecanol, dodecyl acetate, and dodecyl formate. The morphology of the gland and the chemistry of the secretion are discussed in relation to other notodontid larvae which have been investigated. It is conjectured that the secretion is not defensive in nature but may function as a dispersal pheromone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041995
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  • 2
    Electronic Resource
    Electronic Resource
    Morphology of the prothoracic defensive gland ofSchizura concinna (J.E. Smith) (Lepidoptera:Notodontidae) and the nature of its secretion (1979)
    Springer
    Journal of chemical ecology 5 (1979), S. 165-177 
    Details
    ISSN: 1573-1561
    Keywords: Schizura concinna ; Lepidoptera ; Notodontidae ; prothoracic ; defensive gland ; allomone ; defensive secretion ; decyl acetate ; dodecyl acetate ; 2-tridecanone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The larval defensive gland ofSchizura concinna (J.E. Smith) is situated in the thorax and consists of two sacs joined by an interglandular neck. Its orifice opens into a transverse invagination of the integument at the cervical margin of the prosternite. The major component of the defensive secretion, formic acid, was identified as itsp-bromophenacyl ester. Ancillary components decyl acetate, dodecyl acetate, and 2-tridecanone from the anterior portion of the gland were identified by GLC and GS-MS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988232
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  • 3
    Electronic Resource
    Electronic Resource
    13C CP/MAS NMR studies of morphological changes in polypropylene: 2. The double melting endotherm of spunbonded fabrics (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 2085-2098 
    Details
    ISSN: 0887-6266
    Keywords: polypropylene ; CP/MAS NMR ; spunbonded fabrics ; crystal structure ; melting ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The double melting endotherm of spunbonded isotactic polypropylene (iPP) fabrics was investigated by monitoring changes in the solid-state NMR spectrum that result from thermal annealing. The DSC melting thermogram was found to change from a double to a single endotherm at anneal temperatures ≥156°C, with a concomitant increase in percent crystallinity. All of the carbon resonances in the CP/MAS NMR spectrum of the purely crystalline phase of iPP were found to be composed of multiple peaks with relative intensities that depend on anneal temperature. By monitoring the changes in the distribution of intensity among the various peaks of a given resonance, a transition temperature of 156°C was identified. Arguments are presented that this redistribution of intensity within a given carbon resonance characterizes the transformation from the α1 to the α2 monoclinic crystal form. The exothermicity associated with this transformation is responsible for the observation of a double melting endotherm by DSC. The splitting patterns observed in the NMR spectrum are discussed in terms of interlayer distances between layers of isochiral helices and the density of exposed methyls at the contact faces of these interlayers. © 1996 John Wiley & Sons, Inc.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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