| novel polyhydroxysterols from the red sea marine sponge lamellodysidea herbacea. | chemical investigation of the dichloromethane extract of the red sea marine sponge lamellodysidea herbacea led to the isolation of four novel polyhydroxysteroids: cholesta-8-en-3beta,5alpha,6alpha,25-tetrol (1), cholesta-8(14)-en-3beta,5alpha,6alpha,25-tetrol (2), cholesta-8,24-dien-3beta,5alpha,6alpha-triol (3), and cholesta-8(14),24-dien-3beta,5alpha,6alpha-triol (4). their structures were identified through 1d and 2d nmr studies. relative stereochemistries were established by analysis of chem ... | 2005 | 16154169 |
| investigation of oscillatoria spongeliae-dominated bacterial communities in four dictyoceratid sponges. | certain species of marine sponges in the order dictyoceratida harbor large populations of the cyanobacterial symbiont oscillatoria spongeliae in the mesohyl (interior) of the sponge. we show that in four of these sponge species (lamellodysidea herbacea, lamellodysidea chlorea, lendenfeldia chondrodes, and phyllospongia papyracea) from palau there is a consistent community of alpha-proteobacteria in addition to o. spongeliae that fall within the rhodobacter group based on 16s rrna gene analysis. ... | 2005 | 16269779 |