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  • 1
    Electronic Resource
    Electronic Resource
    Marine gamete-release pheromones (1996)
    [s.l.] : Nature Publishing Group
    Nature 382 (1996), S. 214-214 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - In contrast to the large body of experimental evidence for the existence of sex pheromones in marine invertebrates, only a few chemical structures of these compounds have been elucidated1'2. Here we report the isolation and identification of two gamete-release pheromones of marine ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/382214a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cysteine-glutathione disulfide, the sperm-release pheromone of the marine polychaete Nereis succinea (Annelida: Polychaeta) (1998)
    Springer
    Chemoecology 8 (1998), S. 33-38 
    Details
    ISSN: 1423-0445
    Keywords: Key words. sex pheromone - marine invertebrates - marine polychaetes - Nereis succinea - sperm release - cysteine-glutathione disulfide - glutathione - peptides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary. In the marine polychaete Nereis succinea (Frey & Leuckart 1847) a sex pheromone was isolated from the coelomic fluid of sexually mature females and identified by NMR studies and independent synthesis. This pheromone is released by the females during reproduction together with eggs and coelomic fluid into the free water column and induces sperm release of surrounding males. Its structure was ascertained as L-cysteine-glutathione disulfide. It exhibited a response threshold of 0.6 · 10−7 M.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00001801
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  • 3
    Electronic Resource
    Electronic Resource
    Inosine, L-glutamic acid and L-glutamine as components of a sex pheromone complex of the marine polychaete Nereis succinea (Annelida: Polychaeta) (1998)
    Springer
    Chemoecology 8 (1998), S. 77-84 
    Details
    ISSN: 1423-0445
    Keywords: Key words. pheromone - sex pheromone - egg release pheromone - marine invertebrate - polychaete - Nereis succinea - inosine - nucleoside - glutamic acid - glutamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary. Pheromones released by male marine polychaetes Nereis succinea (Frey & Leuckart 1847) initiate egg release in mature females. Here we describe isolation and identification of components of the egg release pheromone bouquet from the coelomic fluid of sexually mature males. Inosine, L-glutamic acid and L-glutamine are identified to be components. Inosine, an egg release component, has a response threshold that is reduced eightfold by simultaneous presentation 1 : 1 with L-glutamic acid or L-glutamine. A fourth substance in the bouquet is tentatively identified as guanosine. The natural relative concentrations of all members of the pheromone bouquet and their mutual influence must still be explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00001807
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  • 4
    Electronic Resource
    Electronic Resource
    (p-d) π-bonding and hyperconjugation in vinylsilane (1974)
    Springer
    Theoretical chemistry accounts 35 (1974), S. 301-308 
    Details
    ISSN: 1432-2234
    Keywords: Vinylsilane ; Hyperconjugation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ab initio calculations were performed for SiH3-CH=CH2 and CH3-CH=CH2. They lead to the result that the bathochromic shift observed in the spectra when replacing the methyl group of propylene by a silyl group can be explained by differences in the hyperconjugation between the silyl- or methyl-group and the vinyl rest of the molecules. This result is gained qualitatively correct already without including silicon d-functions. The inclusion of silicon d-functions is helpful for a quantitatively accurate description. The d-function participation gains within the functional basis employed here considerable weight in the excited states only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00548480
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  • 5
    Electronic Resource
    Electronic Resource
    Uric Acid: The Sperm-Release Pheromone of the Marine Polychaete Platynereis dumerilii (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 13-22 
    Details
    ISSN: 1573-1561
    Keywords: Sex pheromone ; sperm release ; egg release ; uric acid ; purine ; reproduction ; polychaete ; Annelida ; Platynereis dumerilii ; coelomic fluid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In the marine polychaete, Platynereis dumerilii, reproductive behavior in the two sexes is synchronized by the consecutive discharge of male and female sex-specific pheromones. After the female releases the eggs into the free water column, immediate fertilization is achieved by several males circling around the eggs emitting sperm clouds. We report the isolation and identification of the sperm-release pheromone present in the coelomic fluid of sexually mature females. Each step in isolation was guided by bioassay. Isolation methods included extraction and solvent partitioning and separation methods included ultrafiltration and high-performance liquid chromatography. Uric acid was identified as the sperm-release pheromone that is discharged by the female with release of the eggs. The threshold concentration for sperm release by males was determined as 0.6 μM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022328610423
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    Paper (German National Licenses)
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