1,721,163 research outputs found
Recent results in the chemistry of echinoderms: steroidal glycosides and polyhydroxysteroids
No full textL’integrazione dei rifugiati nel mercato del lavoro: evidenza dalla EU Labour Force Survey
Full text linkStarfish saponins. Part 39. Steroidal oligoglycoside sulfates and polyhydroxysteroids from the starfish Asterina pectinifera
No full textA reinvestigation of the exts. of the starfish A. pectinifera has led to the isolation of a novel asterosaponin pectinioside G (I) along with the already reported pectiniosides A, D, and acanthaglycoside C. The exts. contained asterosaponin P-1, previously isolated as sodium salt from Patiria pectinifera and Oreaster reticulatus, and now isolated also as tyramonium salt, and 5 highly hydroxylated steroids, among which I is new
Paniceins and Related Sesquiterpenoids From the Mediterranean Sponge Reniera-fulva
No full textTwo novel sesquiterpenes,fulvanin 1 [1] and fulvanin 2[2], have been isolated from the Mediterranean sponge Reniera fulva. Compound 2 is a sesquiterpenoid linked to a hydroquinone. Also found in Reniera fulva are four known paniceins, a group of aromatic sesquiterpenoids linked to a quinol, isolated previously from Halichondria panicea. The total assignments of C-13-nmr spectra of paniceins have been made with the aid of 2D(HC)-H-1-C-13 correlation techniques, confirming their structures. The paniceins were tested in the in vitro disease-oriented primary antitumor screen at NCI, Bethesda. Paniceins C and B3 showed cytotoxicity against NCI-H522 non-small lung cancer cells and CCRF-CEM leukemia cells, while panicein A hydroquinone revealed more selective cytotoxicity against the latter ones
Steroids from sponges: occurrence of steroidal Δ4,7-3,6-diketones in the marine sponge Raphidostila incisa
No full textR. incisa contained C27-C29 steroidal 4,7,22-triene-3,6-diones along with major amts. of 5α,8α-epidioxy-Δ6 sterols. The structures of the hitherto undescribed steroidal 4,7-diene-3,6-diketones were proven by the synthesis of 4,7,22-ergostatriene-3,6-dione
Nuovi ciclodepsipeptidi ad attività antivirale e macrolidi citotossici dalla spugna lithistida Callipelta sp.
No full textConstituents of the digestive gland of molluscs of the genus Aplysia. II. Halogenated monoterpenes from Aplysia limacina
No full textThe digestive gland of the sea hare A. limacina contained an array of polyhalogenated monoterpenes. The 2 major components were 3,4-erythro-7-dichloromethyl-3-methyl-3,4,8-trichloro-1,5(E),7(Z)-octatriene (I), previously isolated from pacific red alga Plocamium cartilagineum, and the new 3,4-threo-7-dibromomethyl-3-methyl-3,4,8-trichloro-1,5(E),7(E)-octatriene. Examn. of exts. of local red algae revealed that I was present in P. coccineum
Starfish Saponins .24. 2 Novel Steroidal Glycoside Sulfates From the Starfish Echinaster-sepositus
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