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  • Biochemistry and Biotechnology  (11)
  • Apis mellifera  (5)
  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Honey bee ; Apis mellifera ; pheromone ; Nasonov pheromone ; extraction technique ; GC-MS ; [13C]-NMR ; terpenoids
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01402919
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Honey bees ; Apis mellifera ; pheromone ; Nasonov pheromone ; enzymic oxidation ; terpenoids
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00987702
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  • 3
    Digitale Medien
    Digitale Medien
    (Z)-11-eicosen-1-ol, an important new pheromonal component from the sting of the honey bee,Apis mellifera L. (Hymenoptera, Apidae.) (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 163-175 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Honey bee ; Apis mellifera ; Hymenoptera ; Apidae ; pheromone ; (Z)-11-eicosen-1-ol ; sting ; EAG ; alarm pheromone ; mass spectrometry ; epoxides
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract (Z)-11-Eicosen-1-ol was identified by GC-MS and microchemical methods as a major volatile component, ca. 5 μg per insect, secreted by the sting apparatus of the worker honey bee. When presented on moving lures at the hive entrance, (Z)-11-eicosen-1-ol, like isopentyl acetate already known as an alarm pheromone, elicited stinging, and together these two compounds were as active as the natural pheromone from the sting. On stationary lures, (Z)-11-eicosen-1-ol prolonged the effectiveness of isopentyl acetate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00984013
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Honeybee ; Apis mellifera ; Hymenoptera ; Apidae ; electro-antennography ; Nasonov pheromone ; multicomponent pheromone ; enzymic oxidation ; behavior ; foraging
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00987804
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  • 5
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Honeybee ; Apis mellifera ; Hymenoptera ; Apidae ; pheromone ; Nasonov pheromone ; footprint pheromone ; bioassay ; anemotaxis ; geraniol ; nerobic acid ; (Z)-citral ; geranic acid ; (E,E)-farnesol
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00995745
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  • 6
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: 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.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260260519
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  • 7
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260260732
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  • 8
    Digitale Medien
    Digitale Medien
    Periodic forcing of microbial cultures: A model for induction synchrony. (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 825-835 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Periodic environmental shifts have been used to induce synchrony in many different microbial populations. In this article, the induction synchrony phenomenon is analyzed using an age distribution model in which the age at which the cells divide is subjected to periodic forcing. It is found that synchrony will occur whenever the period of the forcing lies in the interval between the youngest and the oldest division age that occur in the population during the forcing. The analysis also predicts that under certain conditions it should be possible to obtain a multimodal synchrony in which cells in the population are distributed among a set of discrete, synchronized cell lines. The behavior of the age distribution when the conditions for synchrony are not satisfied is briefly explored. It is found that the age distribution model is able to exhibit a very rich spectrum of possible dynamic behavior. Many of the phenomena observed can be thought of in terms that are familiar from nonlinear analysis, such as stable and unstable limit cycles, period doubling, halving, and chaos. The richness of dynamic behavior opens the possibility that environmental shifts or periodic forcing could be used as a powerful tool in discriminating models of microbial kinetics and cell cycle control.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260300704
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  • 9
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260260730
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  • 10
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: 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.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260261002
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