[Show abstract][Hide abstract] ABSTRACT: The sterol composition of Hymeniacidon sanguinea and Halichondria panicea from the Black Sea was investigated. Both sponges contain similar mixtures of stanols and of dietary Δ
[Show abstract][Hide abstract] ABSTRACT: The sterol composition of two sponges, Haliclona flavescens and Haliclona cinerea, from the Black Sea was investigated. Sterol composition in the two species is similar and both sponges actively transform dietary sterols into stanols and further to Δ7-sterols. Short side chain sterols of androstane and pregnane type were discovered in one sample. The composition of steryl esters and the taxonomic position of the two Haliclona species are discussed.
[Show abstract][Hide abstract] ABSTRACT: Relatively rare 4-methyl sterols were isolated from Haliclona cinerea (two samples) and Haliclona flavescens. Thirteen sterols were identified for the first time in sponges, five of these for the first time in marine organisms and two (1b and 2h) for the first time in nature. The possible position of these compounds in food webs is discussed.
[Show abstract][Hide abstract] ABSTRACT: Free sterols and sterol esters from the Black Sea sponge Lissodendoryx variisclera were isolated. Fifteen sterols were identified, two of them for the first time in marine organisms (2i and 2f).
[Show abstract][Hide abstract] ABSTRACT: The fatty acid composition of the tunicate Botryllus schlosseri and of two bacterial strains found within the tunicate, namely Vibrio parahaemolyticus and of an associated but previously unreported gram positive cocci were studied. The polyunsaturated fatty acids 6,9,12-octadecatrienoic acid, 5,8,11,14,17-eicosapentaenoic acid, and 4,7,10,13,16,19-docosahexaenoic acid were particularly abundant in B. schlosseri and were not detected in the two bacterial strains found in the tunicate. The iso/anteiso pair, 13-methyltetradecanoic acid and 12-methyltetradecanoic acid, were the principal fatty acids in the gram positive cocci, and the 9- and 11-hexadecenoic acids were particularly abundant in V. parahaemolyticus. The diunsaturated fatty acid 9,12-octadecadienoic acid was also shown to be present in V. parahaemolyticus. The fatty acid composition of a third bacterial strain, characterized as either a Pseudomonas or an Alteromonas species, and shown to be present only in the sea water from the Black Sea and not in B. schlosseri, is also reported. This is the first investigation on fatty acids from Black Sea bacteria.
[Show abstract][Hide abstract] ABSTRACT: The fatty acid composition of the sponge Hymeniacidon sanguinea from the Black Sea has been determined by methods involving silver ion HPLC and GC-MS. More than a hundred different fatty acids were identified, of which many were similar to those in sponges from tropical seas. By contrast, some of the fatty acids identified, including trans-6-hexadecenoic acid and 5,15-tetracosadienoic acid, may not have been found previously in sponges and other marine sources, and perhaps are new to science.
[Show abstract][Hide abstract] ABSTRACT: 1.1. The fatty-acid composition of the red and green forms of Actinia equina from the Black Sea have been determined by methods involving silver-ion HPLC and GC-MS.2.2. The fatty acid compositions of both forms of A. equina resemble those of most marine invertebrates. Substantial amounts of C20 and C22 polyunsaturated fatty acids were found.3.3. Balck Sea Actenia equina contains a large amount of plasmalogens, mainly phospotidylcholine and phosphatidylserine plasmalogens.4.4. The red form of A. equina contains more arachidonic acid in glycolipid fraction and more phosphatidylethanolamine and its plasmalogen, while the green from contains more sphingomyelin. These differences are an indication that the species A. equina can be divided into two subspecies—green and red.