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  • 1
    Electronic Resource
    Electronic Resource
    A model for the future of electronic commerce (1997)
    Bradford : Emerald
    Information management & computer security 5 (1997), S. 166-169 
    Details
    ISSN: 0968-5227
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Presents a discussion of traditional market segmentation in the context of the changing parameters of trade presented by electronic commerce. The discussion is based on two years of research by the director of an Australian futures research and scenario planning consultancy. Considers the three worlds of commerce labelled "marketplace", "marketspace" and "customerspace". Introduces and discusses the unprecedented business roles resulting from the intersections of these three worlds of commerce. Hypothesizes about the future of customer interrelationships based on these ways of trading and the emerging business roles. Highlights the major challenges to businesses for competing effectively in this future scenario.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09685229710187221
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Regulation of synthesis and turnover of maize auxin-binding protein and observations on its passage to the plasma membrane: comparisons to maize immunoglobulin-binding protein cognate (1995)
    Springer
    Planta 197 (1995), S. 465-474 
    Details
    ISSN: 1432-2048
    Keywords: Auxin-binding protein ; Chaperone ; Endoplasmic reticulum ; Plasma membrane ; Protein synthesis/turnover ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Electrophysiological experiments have indicated that a fraction of the major auxin-binding protein (ABP1) of maize (Zea mays L.) might be a receptor on the outer surface of the plasma membrane. The predominant location of ABP1 is in the lumen of the endoplasmic reticulum (ER), in accord with its C-terminal KDEL retention signal. Little is known about the biology of the protein in vivo or the rate at which it might pass to the cell surface. We have examined the turnover of ABP1 by in vivo labelling of maize coleoptile sections. After different chase times, ABP1 was immunoprecipitated from detergentsolubilised membrane preparations. Two polypeptides coprecipitated with ABP1. Neither was recognised by any ABP1 antibodies nor by monoclonals to ER retention sequences. The possible significance of these coprecipitating polypeptides is discussed. In addition, we have used a monoclonal antibody to precipitate HDEL proteins from the same membrane preparations. Two dimensional electrophoresis and N-terminal sequencing showed that the major HDEL protein precipitated was a member of the heat-shock-protein 70 family, a homologue of BiP (immunoglobulin-binding protein). We have investigated the turnover of this BiP homologue for comparison with ABP1 and found that both had extended lifetimes, with half-lives greater than 24 h. Use of cordycepin to inhibit transcription indicated that ABP1 mRNA was also longlived. Synthesis of ABP1 was strongly reduced by heat stress, was reduced a little in response to dithiothreitol and was not markedly changed by tunicamycin. In contrast, BiP synthesis increased markedly in response to tunicamycin and dithiothreitol and increased a little after heat stress. Neither auxin nor other plant growth regulators altered ABP1 synthesis or turnover. Auxin binding is thought to induce a conformational change in ABP1 which might be associated with its escape from the ER. Incubation of coleoptile sections in auxin did not alter the balance of ABP1 between ER-enriched and plasmamembrane-enriched fractions over prolonged chase times. We discuss the turnover characteristics of ABP1 in terms of its known cellular distribution and of its function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196668
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrogen-bonding 8.Part 7; M. H. Abraham, P. L. Grellier, D. V. Prior, P. P. Duce, J. J. Morris and P. J. Taylor. J. Chem Soc., Perkin Trans. 2, (in press). Possible equivalence of solute and solvent scales of hydrogen-bond basicity of non-associated compounds (1989)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 2 (1989), S. 540-552 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Using the solvatochromic indicator method, a scale of solvent hydrogen-bond basicity, β1 (General), has been set up using a series of double regression equations, \documentclass{article}\pagestyle{empty}\begin{document}$$ \nu = \nu _0 + s\pi _1^* + b\beta _1 $$\end{document} for 11 aniline-type indicators. A similar solvent scale, β1 (Special), has been constructed by the homomorphic comparison method using only results by Laurence et al. on the indicators 4-nitroaniline and 4-nitro-N,N-dimethylaniline. Results are available from our previous work on a general solute scale, β2H, and we have also obtained a special solute scale, β2 (pKHB) from available log K values for hydrogen-bond complexation of bases with 4-fluorophenol in CCl4. However, the two solute β2 scales are virtually identical.It is shown that there is a general connection between β1(General) and β2H, with r = 0·9775 and s.d. = 0·05 for 32 compounds, and between β1(Special) and β2H, with r = 0·9776 and s.d. = 0·06 for the same 32 compounds. The latter correlation over 60 compounds yields r = 0·9684 and s.d. = 0·07. However, there are so many compounds in these regressions for which the differences in the solvent and solute β values are larger than the total expected error of 0·07 units that the use of β1 to predict β2 or vice versa is a very hazardous procedure. About 70 new β1 values obtained by the double regression method are also reported.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610020706
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    Paper (German National Licenses)
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