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Barnacle (Balanus amphitrite) settlement on synthetic hydrogels with various chemical structures was tested in laboratory assays. The results demonstrated that cyprids settle less or not at all on hydrogels and PDMS elastomer compared with the polystyrene control. The low settlement on gels is most likely due to the 'easy release' of initially attached(More)
The marine sponge Acanthella cavernosa and nudibranchs of the family Phyllidiidae contain isocyanoterpenoids and their related compounds that show potent antifouling activity against cypris larvae of the barnacle Balanus amphitrite, while their toxicity to cyprids is weak. To develop non-toxic antifoulants based on isocyanoterpenoids, especially(More)
An antifouling active natural compound, 3-isocyanotheonellin, and its analogues were synthesized and evaluated for antifouling activity against the larvae of the barnacle Balanus amphirite in order to explore structure-activity relationships. The anti-barnacle effect of the 3-isocyanotheonellin analogues was in the EC50 range 0.18-7.20 micrograms ml-1. Some(More)
Twelve simple linear isocyanides were synthesized and examined for antifouling activity and toxicity against cyprid larvae of the barnacle, Balanus amphitrite. Larval settlement was inhibited, with EC50 values of 0.046-1.90 microg ml(-1), and they were much less toxic (LD50 values ranging over 21.28 microg ml(-1)) than CuSO4 (EC50 0.30 microg ml(-1) and(More)
A total of 118 Japanese marine invertebrates were extracted with methanol, and their chloroform-soluble materials tested for antifouling activity as well as toxicity against barnacle (Balanus amphitrite) larvae. Among 86 species that showed more than 80% larval settlement inhibition, 13 species, including 8 sponges were weakly toxic to the barnacle larvae.(More)
Blooms of moon jellyfish Aurelia aurita s.l. occur in various vertical distribution patterns within the water column. Reasons for these distribution patterns have remained obscure. To quantify the influence of pycnocline and low dissolved oxygen (DO) on the vertical distribution of A. aurita aggregations, we investigated temperature, salinity, DO, and(More)
Larval development and settlement of whale barnacles have not previously been described, unlike intertidal barnacles. Indeed, the mechanisms of the association between barnacles and whales have not been studied. Here we describe the larval development and settlement of the whale barnacle, Coronula diadema, and possible involvement of a cue from the host in(More)
A mass spectrometry (MS)-guided isolation has led to the purification of a new cyanobactin, wewakazole B (1), along with the known compound curacin D from a Red Sea Moorea producens. The planar structure of 1 was elucidated using a combination of NMR and MS techniques. After ozonolysis and acid hydrolysis, the absolute configurations of the amino acid(More)
Natural antifouling products have been the subject of considerable attention. We screened marine algae for antifouling activity and discovered omaezallenes, the new bromoallene-containing natural products isolated from the red alga Laurencia sp. Described is the isolation, structure elucidation, and total syntheses of omaezallenes. The relative and absolute(More)
Twenty novel simple alkyl isocyanides derived from citronellol were synthesized and evaluated for their antifouling activity and toxicity against cypris larvae of the barnacle, Balanus amphitrite. The anti-barnacle activity of the synthesized isocyanides was in the EC(50) range of 0.08-1.49 μg ml(-1). Simple isocyanides containing a benzoate and chloro(More)