Publications

constituents and biological activity of bidens pilosa l. grown in egypt.	column chromotography and preparative tlc of the light petroleum-diethyl ether extract from bidens pilosa l. afforded tridecapentyn-1-ene, trideca-2,12-diene-4,6,8,10-tetrayne-1-ol, trideca-3,11-diene-5,7,9-triyne-1,2-diol and trideca-5-ene-7,9,11-triyne-3-ol. the compounds were identified on the bases of uv, 1h-nmr spectra and comparison with reported data. the chloroform extract was chromatographed to yield b-amyrin, phytosterin-b, esculetin and b-sitosterol glucoside. the petroleum ether extr ...	1991	1785360
constituents of bidens pilosa l.: do the components found so far explain the use of this plant in traditional medicine?	the dried aerial parts of bidens pilosa l. were extracted with petrol ether, chloroform, methanol, and methanol/water. the petrol ether and the methanol/water extracts showed some antimicrobial activity. fractionation of the extracts yielded well known substances, most of which have, however, not yet been described as constituents of bidens pilosa. several of these substances have previously been shown to be biologically active. thus, phenylheptatriyne, linolic acid and linolenic acid have antim ...	1991	1674399
sticktight fleas (echidnophaga gallinacea) on birds.		1992	1557875
ultraviolet-mediated cytotoxic activity of phenylheptatriyne from bidens pilosa l.	the tropical weed bidens pilosa l. (asteraceae) contains a number of polyacetylenes which are phototoxic to bacteria, fungi, and human fibroblast cells in the presence of sunlight, artificial sources of long-wave ultraviolet light, or cool-white fluorescent light. the principle photoactive compound in the leaf, phenylheptatriyne, is present in the cuticle as well as in the underlying cells. experiments with calf thymus dna indicate that, unlike photoactive furanocoumarins, phenylheptatriyne does ...	1979	469551
studies on the esophagus. ii. enhancement of [3h]thymidine incorporation in the rat esophagus by bidens pilosa (a plant eaten in south africa) and by croton oil.		1979	421195