| cholestane glycosides from the bulbs of ornithogalum thyrsoides and their cytotoxic activity against hl-60 leukemia cells. | twelve bisdesmosidic cholestane glycosides (1-12), including nine new ones (1-9), were isolated from the bulbs of ornithogalum thyrsoides by monitoring the cytotoxic activity on hl-60 leukemia cells. the structural assignment of the new compounds was carried out by spectroscopic analysis and the results of hydrolytic cleavage. the 3-o-monoglucosides with an aromatic acyl group at the c-16 diglycoside moiety (1, 12) were extremely cytotoxic, with respective ic(50) values of 0.00016 and 0.00013 mi ... | 2002 | 12398536 |
| nucleotide sequences of the coat protein gene of potyviruses infecting ornithogalum thyrsoides. | species of three viral genera infecting ornithogalum thyrsoides plants showing mosaic symptoms were identified using rt-pcr and degenerate universal primers for each viral genus. the dna fragments obtained encoded the coat protein (cp) gene and were sequenced. the plants were found to be infected with one or other of three potyvirus species, one of them was ornithogalum mosaic virus (ormv). the other two viruses were previously unrecorded and were named ornithogalum virus 2 (ov-2) and 3 (ov-3). ... | 2003 | 12664289 |
| steroidal glycosides from the bulbs of ornithogalum thyrsoides. | phytochemical analyses have been carried out on the fresh bulbs of ornithogalum thyrsoides with particular attention to the steroidal glycoside constituents, resulting in the isolation of four new spirostanol saponins and seven new cholestane glycosides, together with three known steroidal compounds. the structures of the new glycosides were determined on the basis of their spectroscopic data, including 2d nmr spectroscopy, and the results of hydrolytic cleavage. the isolated compounds were eval ... | 2004 | 15497941 |
| ornithosaponins a-d, four new polyoxygenated steroidal glycosides from the bulbs of ornithogalumthyrsoides. | by analyzing the steroidal glycoside content of fresh bulbs of ornithogalum thyrsoides (liliaceae), we were able to isolate four new polyoxygenated steroidal glycosides, which we named ornithosaponins a-d (1-4). the structures of 1-4 were elucidated on the basis of extensive spectroscopic analysis, including that of 2d nmr data, and the results of acidic or alkaline hydrolysis. the aglycone structure of 1-4 has not been previously reported. it is also notable that ornithosaponins b-d (2-4) have ... | 2006 | 16303157 |
| is the flower fluorescence relevant in biocommunication? | flower fluorescence has been previously proposed as a potential visual signal to attract pollinators. in this work, this point was addressed by quantitatively measuring the fluorescence quantum yield (φ(f)) for flowers of bellis perennis (white, yellow, pink, and purple), ornithogalum thyrsoides (petals and ovaries), limonium sinuatum (white and yellow), lampranthus productus (yellow), petunia nyctaginiflora (white), bougainvillea spectabilis (white and yellow), antirrhinum majus (white and yell ... | 2010 | 20811871 |
| genetic transformation of ornithogalum via particle bombardment and generation of pectobacterium carotovorum-resistant plants. | bacterial soft rot caused by pectobacterium carotovorum subsp. carotovorum (pcc) is one of the most devastating diseases of ornithogalum species. no effective control measures are currently available to use against this pathogen; thus, introduction of resistant genes via genetic transformation into this crop is a promising approach. tachyplesin i, an antimicrobial peptide, has been shown to effectively control numerous pathogenic bacteria, including pcc. in this study, liquid-grown cell clusters ... | 2014 | 25438795 |