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Träfflista för sökning "WFRF:(Dahlström A) srt2:(2000-2004)"

Sökning: WFRF:(Dahlström A) > (2000-2004)

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11.
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  • Nicholls, Ian A., et al. (författare)
  • Can we rationally design molecularly imprinted polymers?
  • 2001
  • Ingår i: Analytica Chimica Acta. ; 435:1, s. 9-18
  • Tidskriftsartikel (refereegranskat)abstract
    • The nearly exponential growth in the molecular imprinting literature has to a large extent been fuelled by an increasing awareness of the potential of molecular imprinting based technologies. Despite the acceptance of the technique by cognate disciplines and the demonstration of its usefulness in a number of enabling technologies, relatively little is known about the molecular level events underlying the imprinting process and subsequent recognition events. What rules govern imprint formation? Can we use such rules to rationally design molecularly imprinted polymers?
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13.
  • Nicholls, Ian A., et al. (författare)
  • Molecularly imprinted polymers: unique possibilities for environmental monitoring
  • 2002
  • Ingår i: Proceedings of Kalmar Eco-Tech'01 : conference on leachate and waste water treatment with high-tech and natural systems : the 3rd International Conference on the Establishment of Cooperation Between Companies/Institutions in the Nordic Countries and the Countries in the Baltic Sea Region : November 26 to 28, 2001 Kalmar, Sweden. - : Högskolan i Kalmar. ; , s. 285-288, s. 285-288
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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14.
  • Sjögren, M., et al. (författare)
  • Antifouling activity of brominated cyclopeptides from the marine sponge Geodia barretti
  • 2004
  • Ingår i: Journal of Natural Products. - : American Chemical Society (ACS). - 0163-3864 .- 1520-6025. ; 67:3, s. 368-372
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work, we show the potent antifouling effects of two compounds, barettin (cyclo[(6-bromo-8-entryptophan)arginine]) (1), isolated as a Z/E mixture (87/13), and 8,9-dihydrobarettin (cyclo[(6-bromotryptophan)arginine]) (2), isolated from the marine sponge Geodia barretti. The compounds were isolated guided by their ability to inhibit the settlement of cyprid larvae of the barnacle Balanus improvisus, and their structures were determined by means of mass spectrometry, NMR, and quantitative amino acid analysis. The activities of these brominated diketopiperazine-like cyclic dipeptides are in the range of antifouling agents in use today, as shown by their EC50 values of 0.9 and 7.9 muM, respectively. However, contrary to today's antifouling agents, the effects of barettin and 8,9-dihydrobarettin are nontoxic and reversible. A small set of synthetic analogues, including L-arginine, L-tryptophan, 5-bromo-D,L-tryptophan, 6-bromo-D,L-tryptophan, and 6-fluoro-D,L-tryptophan, were tested for possible structure-activity relationships. None of these compounds showed any effect at a concentration of 10 muM. We hypothesize that the isolated compounds are part of the sponge's chemical defense to deter fouling organisms. This theory is supported by the fact that barettin is found in water exposed to living specimens of G. barretti in concentrations that completely inhibit barnacles from settling.
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