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  • 1980-1984  (13)
  • Chemistry  (8)
  • Nasonov pheromone  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Attraction of honey bees to flowering plants by using synthetic Nasonov pheromone (1981)
    Springer
    Entomologia experimentalis et applicata 30 (1981), S. 199-201 
    Details
    ISSN: 1570-7458
    Keywords: Honey bee ; Nasonov pheromone ; attraction ; foraging ; pollination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300889
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  • 2
    Electronic Resource
    Electronic Resource
    Nasonov pheromone of the honey bee,Apis mellifera L. (Hymenoptera: Apidae) (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 425-434 
    Details
    ISSN: 1573-1561
    Keywords: Honey bee ; Apis mellifera ; pheromone ; Nasonov pheromone ; extraction technique ; GC-MS ; [13C]-NMR ; terpenoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Composition of the Nasonov pheromone of the honey bee has been reexamined using new procedures, including analysis of pheromone from single live insects by capillary column GC-MS. Two new components have been identified, nerol and (E,E)-farnesol, and the presence of components proposed previously has been confirmed. Absolute amounts or relative proportions of components in the pheromonal secretion have been determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402919
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  • 3
    Electronic Resource
    Electronic Resource
    The Nasonov pheromone of the honeybeeApis mellifera L. (Hymenoptera, Apidae). Part II. Bioassay of the components using foragers (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 225-237 
    Details
    ISSN: 1573-1561
    Keywords: Honeybee ; Apis mellifera ; Hymenoptera ; Apidae ; pheromone ; Nasonov pheromone ; footprint pheromone ; bioassay ; anemotaxis ; geraniol ; nerobic acid ; (Z)-citral ; geranic acid ; (E,E)-farnesol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The Nasonov pheromone of the honeybee comprises seven components, (Z)-citral, nerol, geraniol, nerolic acid, geranic acid, and (E,E)-farnesol. Bioassay of individual components showed each attracted foraging bees. A mixture of components in proportions present in the honeybee was as attractive as the natural secretion, and each component contributed to the attractiveness of the mixture. Honeybees responded anemotactically to the source of Nasonov odor. The presence of footprint pheromone enhanced the attractiveness of the synthetic Nasonov mixture. Nasonov and footprint pheromones may prove useful in attracting honeybees to crops needing pollination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00995745
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  • 4
    Electronic Resource
    Electronic Resource
    Nasonov pheromone of the honey bee,Apis mellifera L. (Hymenoptera, Apidae). part III. (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 543-554 
    Details
    ISSN: 1573-1561
    Keywords: Honey bees ; Apis mellifera ; pheromone ; Nasonov pheromone ; enzymic oxidation ; terpenoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract GC and GC-MS analyses of the multicomponent Nasonov pheromone of the honey bee, and of the air above insects releasing the pheromone, show that constant composition is maintained during release, despite differing volatilities of the components. The regulating mechanism may involve a specific enzyme process, detected in excised Nasonov glands, which converts the major component geraniol into the more volatile (E)-citral. Analysis of honey bees of known ages and at different times of year shows that maximum secretion occurs when foraging is most likely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987702
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  • 5
    Electronic Resource
    Electronic Resource
    Nasonov pheromone of the honeybee.Apis mellifera L. (Hymenoptera, Apidae) (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 567-574 
    Details
    ISSN: 1573-1561
    Keywords: Honeybee ; Apis mellifera ; Hymenoptera ; Apidae ; electro-antennography ; Nasonov pheromone ; multicomponent pheromone ; enzymic oxidation ; behavior ; foraging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Electroantennogram (EAG) responses from worker honeybee antennae were obtained for each Nasonov component. Response amplitudes to 10 μg of components correlated well with reported relative abilities to attract foragers in the field. EAG responses of worker, queen, and drone antennae to natural pheromone were consistently greater than to synthetic pheromone, a difference only partly explained by enzymic conversion of geraniol to (E)-citral during preparation of natural extracts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987804
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  • 6
    Electronic Resource
    Electronic Resource
    Plasmid stability in budding yeast populations: Steady-state growth with selection pressure (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 26 (1984), S. 528-536 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Plasmid gene product accumulation in a cell population depends on the fraction of plasmid-containing cells and the distribution of single-cell plasmid content. These important population properties have been related to plasmid replication regulation and kinetics and to plasmid segregation rules at the single-cell level using population balance mathematical models. Budding yeast populations are considered in detail because of the practical potential of yeast host-vector systems and because of the model complications introduced by the asymmetric division pattern observed for Saccharomyces cerevisiae at all but the largest growth rates. Solutions are presented for several different reasonable models of plasmid replication and segregation. The results offer potential for identification of important qualitative features of yeast plasmid replication and of model parameter values from average and segregated experimental data on yeast populations.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260260519
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  • 7
    Electronic Resource
    Electronic Resource
    Enzymatic hydrolysis of cocoa pod husks (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 26 (1984), S. 807-810 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260260730
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  • 8
    Electronic Resource
    Electronic Resource
    Some properties of a β-galactosidase from an extremely thermophilic bacterium (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 26 (1984), S. 1141-1145 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An inducible β-galactosidase from an extremely thermophilic organism, Thermus strain 4-1A, has been isolated and partially purified. There were significant dissimilarities to T. aquaticus β-galactosidase. It had a pl of 4.5, was inhibited by sulphydryl inhibitors and a number of transition metals, and was activated by EDTA and SH-containing reagents. The β-galactosidase showed strong product inhibition, and weaker inhibition by some other mono- and disaccharides. It was very stable up to 90°C at pH 8. On immobilization by diazonium linkage to porous glass, the pH optimum (6.0), the KM with ONPG (5mM) and the product inhibition were not altered.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260261002
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  • 9
    Electronic Resource
    Electronic Resource
    Plasmid stability in budding yeast populations: Dynamics following a shift to nonselective medium (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 26 (1984), S. 814-819 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260260732
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  • 10
    Electronic Resource
    Electronic Resource
    Low-frequency Raman scattering by anharmonic DNA modes with A⇌B character modeled with a classical double-well oscillator (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 471-491 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The optical modes of DNA that displace one strand against the other are modeled by the motion of an oscillator in an asymmetric quartic double-well potential whose minima represent the A- and B-conformations. Assuming that the variation of the polarizability during vibration derives mainly from the tilting of the base rings relative to the helix axis, the total polarizability tensor is shown to possess approximately ellipsoidal symmetry and to depend nonlinearly on the instantaneous displacement of the two strands. The Raman spectrum of a collection of randomly oriented molecules is calculated. It consists of one or more peaks with characteristic shape. The depolarization ratio is 3/4, independent of molecular conformation and frequency. The results are discussed in the light of existing experimental and theoretical information.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360230306
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