Global ETD Search

1	Recruitment of Balanus improvisus on micro-textures with different geometries and evaluation of methods for analyzing cyprid behaviour Ring, Karin. January 1900 (has links) (PDF) Thesis (Masters)--Göteborg University, 2000. / Title from PDF title page (viewed on Sept. 13, 2007). "January 2000." Includes bibliographical references.
2	Effects of small scale topography on settlement of the barnacle Balanus improvisus (Darwin) cyprid larvae Lejhall, Magnus. January 1900 (has links) (PDF) Thesis (master's)--Göteborg University, 1999. / Title from PDF t.p. (viewed on Sept. 18, 2007). "March 1999." Includes bibliographical references.
3	Flow effects on settlement and recruitment in the barnacle : balanus improvisus with applications for biogouling control / Larsson, Ann. January 2006 (has links) Thesis (doctoral)--Göteborg University, 2006. / Includes bibliographical references. Balanus improvisus Fouling organisms
4	Flow effects on settlement and recruitment in the barnacle Balanus improvisus with application for biofouling control / Larsson, Ann. January 2006 (has links) Univ., Diss.--Göteborg, 2006. / Enth. außerdem 5 Zeitschriftenaufsätze. Balanus improvisus Fouling organisms
5	Epibiosis of red algae and algal metabolites as settlement inhibitors of the barnacle Balanus improvisus Darwin Nylund, Göran M. January 1999 (has links) Thesis (master's)--Göteborg University, 1999. / Title from PDF t.p. (viewed on Sept. 25, 2007). At head of title: Tjärno Marine Biological Laboratory. Includes bibliographical references (p. 13-14).
6	Epibiosis of red algae and algal metabolites as settlement inhibitors of the barnacle Balanus improvisus Darwin Nylund, Göran M. January 1999 (has links) (PDF) Thesis (master's)--Göteborg University, 1999. / Title from PDF t.p. (viewed on Sept. 25, 2007). At head of title: Tjärno Marine Biological Laboratory. Includes bibliographical references (p. 13-14).
7	Bioactive Compounds from the Marine Sponge <i>Geodia barretti</i> : Characterization, Antifouling Activity and Molecular Targets Sjögren, Martin January 2006 (has links) <p>The marine sponge <i>Geodia barretti</i> produces a range of secondary metabolites. Two of these compounds were isolated and elucidated guided by their ability to inhibit settlement of cypris larvae of the barnacle <i>Balanus improvisus</i>. The compounds barettin (cyclo-[(6-bromo-8-en-tryptophan)-arginine]) as E/Z mixture and 8,9-dihydrobarettin (cyclo-[6-bromo-tryptophan)-arginine]) were determined by using mass spectrometry, nuclear magnetic resonance and quantitative amino acid analysis.The bioactivity of these brominated dipeptides is in the range of antifouling substances used today: EC<sub>50</sub> values of 0.9 µM (barettin) and 7.9 µM (8,9-dihydrobarettin). The compounds were successfully synthesised and then tested in a field experiment to evaluate their antifouling properties. The compounds were incorporated in four different commerical, non-toxic marine coatings. The concentrations of the compounds were 0.1 and 0.01% (w/w) and coated panels were exposed to field conditions for eight weeks. The experiment evaluated the effect of barettin and 8,9-dihydrobarettin on recruitment of the barnacle <i>B. improvisus</i> and the blue mussel <i>Mytilus edulis</i> (major Swedish foulers). The most efficient paint was a SPC polymer, for which the reduction of recruitment of <i>B. improvisus</i> was 89% with barettin (0.1%) and 61% with 8,9-dihydrobarettin (0.1%). For <i>M. edulis</i> the reduction of recruitment was 81% with barettin (0.1%) and 72% with 8,9-dihydrobarettin (0.1%) with the same SPC paint. Furthermore, 14 analogs of barettin and dipodazine were synthesised and tested for their ability to inhibit larval settlement. Two of the analogs have a barettin scaffold and twelve have a dipodazine scaffold. Six of the analogs displayed significant settlement inhibition with the most potent inhibitor being benzo[g]dipodazine (EC<sub>50</sub> value 0.034 µM). The effect of benzo[g]dipodazine was also shown to be reversible. Finally, an investigation of the mode of action was performed on 5-HT receptors. Barettin demonstrated a specific affinity to 5-HT<sub>2A</sub>, 5-HT<sub>2C</sub> and 5-HT<sub>4</sub>, while 8,9-dihydrobarettin interacted only with 5-HT<sub>2C</sub> of the receptor subtypes tested (5-HT<sub>1</sub>-5-HT<sub>7</sub>).</p> Pharmacognosy Geodia barretti barettin secondary metabolites settling inhibition Balanus improvisus analogs 5-HT Farmakognosi
8	Bioactive Compounds from the Marine Sponge Geodia barretti : Characterization, Antifouling Activity and Molecular Targets Sjögren, Martin January 2006 (has links) The marine sponge Geodia barretti produces a range of secondary metabolites. Two of these compounds were isolated and elucidated guided by their ability to inhibit settlement of cypris larvae of the barnacle Balanus improvisus. The compounds barettin (cyclo-[(6-bromo-8-en-tryptophan)-arginine]) as E/Z mixture and 8,9-dihydrobarettin (cyclo-[6-bromo-tryptophan)-arginine]) were determined by using mass spectrometry, nuclear magnetic resonance and quantitative amino acid analysis.The bioactivity of these brominated dipeptides is in the range of antifouling substances used today: EC50 values of 0.9 µM (barettin) and 7.9 µM (8,9-dihydrobarettin). The compounds were successfully synthesised and then tested in a field experiment to evaluate their antifouling properties. The compounds were incorporated in four different commerical, non-toxic marine coatings. The concentrations of the compounds were 0.1 and 0.01% (w/w) and coated panels were exposed to field conditions for eight weeks. The experiment evaluated the effect of barettin and 8,9-dihydrobarettin on recruitment of the barnacle B. improvisus and the blue mussel Mytilus edulis (major Swedish foulers). The most efficient paint was a SPC polymer, for which the reduction of recruitment of B. improvisus was 89% with barettin (0.1%) and 61% with 8,9-dihydrobarettin (0.1%). For M. edulis the reduction of recruitment was 81% with barettin (0.1%) and 72% with 8,9-dihydrobarettin (0.1%) with the same SPC paint. Furthermore, 14 analogs of barettin and dipodazine were synthesised and tested for their ability to inhibit larval settlement. Two of the analogs have a barettin scaffold and twelve have a dipodazine scaffold. Six of the analogs displayed significant settlement inhibition with the most potent inhibitor being benzo[g]dipodazine (EC50 value 0.034 µM). The effect of benzo[g]dipodazine was also shown to be reversible. Finally, an investigation of the mode of action was performed on 5-HT receptors. Barettin demonstrated a specific affinity to 5-HT2A, 5-HT2C and 5-HT4, while 8,9-dihydrobarettin interacted only with 5-HT2C of the receptor subtypes tested (5-HT1-5-HT7). Pharmacognosy Geodia barretti barettin secondary metabolites settling inhibition Balanus improvisus analogs 5-HT Farmakognosi
9	Ocean acidification effects on marine organisms : a study of Littorina littorea and Balanus improvisus Domeij Hilliges, Isak, Stendahl, Cecilia January 2011 (has links) The world’s oceans are becoming more acid in a process called ocean acidification. The pH of the ocean have already decreased by 0.1 units from pre-industrial time until today. Scientists predict that by the year of 2100 the pH will decrease by as much as 0.4 units. This is a big potential problem to many marine species, because they have developed in such a stable environment that has not changed for millions of years. It is difficult to predict how they might be affected by such a decrease in pH during a relatively short time period. Several studies have been made on marine species exposed to decreased pH-levels, the results showed changes in their physiology but it is hard to predict how these changes will affect the organism in a long-term scale and if this might change ecosystem dynamics. Our study measured the activity of Littorina littorea and Balanus improvisus when exposed to lower pH, the results of our study showed an increase in activity for the lower pH (pH 6.0-7.5) when compared to the control (~pH8). The area of ocean acidification is a field that requires further studies to fully understand its effects on the marine ecosystems and the species within it. ocean accidification accidification pH sea marine organism marine littorina littorea balanus improvisus periwinkle barnacle CO2 acid ecosystem activity cirral movement calcium carbonate system buffering low pH havsförsurning försurning pH hav marina organismer marin littorina littorea balanus improvisus havstulpan strandsnäcka CO2 surt ekosystem aktivitet cirrala rörelser buffrande lågt pH

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