| chemical constituents of brazilian propolis and their cytotoxic activities. | the etoac-soluble fraction of the meoh extract of propolis afforded a new prenylated chromane derivative, 3-hydroxy-2, 2-dimethyl-8-prenylchromane-6-propenoic acid (1), along with 22 known compounds, 2-23. of the known compounds, 4, 7, 12-19, and 22 were isolated for the first time from propolis, and the absolute configuration of 23 was established as (2s,3r). investigation suggested that baccharis spp. are a significant source of tropical brazilian propolis, in addition to clusia minor, clusia ... | 1998 | 9677271 |
| chemical and biological investigation of araucaria heterophylla salisb. resin. | three labdane diterpenes, namely lambda-8(17),14-diene, 13-epicupressic acid, and 13-oacetyl-13-epicupressic acid, were isolated from the resin collected from stem exudates of araucaria heterophylla salisb. (araucariaceae). the isolated compounds were identified using different spectroscopic methods (1h nmr, 13c nmr, hmqc, hmbc and cosy). the resin extract showed antiulcerogenic activity against ethanol-induced stomach ulcers in sprauge dawely rats using ranitidine as standard. in addition, the ... | 2009 | 20158152 |
| drought avoidance and vulnerability in the australian araucariaceae. | the araucariaceae is an iconic tree family. once globally important, the araucariaceae declined dramatically over the cenozoic period. increasing aridity is thought to be responsible for extinction and range contraction of araucariaceae in australia, yet little is known about how these trees respond to water stress. we examined the response to water stress of the recently discovered tree wollemia nobilis jones, w.g., hill, k.d. & allen, j.m. (araucariaceae) and two closely related and widespread ... | 2016 | 26612850 |
| araucaria gum: novel natural polymer for controlled drug delivery. development, in vitro and in vivo evaluation of araucaria gum based matrix tablets for controlled release. | assessment of natural polymers in oral controlled drug delivery. | 2016 | 28034362 |
| two tropical conifers show strong growth and water-use efficiency responses to altered co2 concentration. | conifers dominated wet lowland tropical forests 100 million years ago (mya). with a few exceptions in the podocarpaceae and araucariaceae, conifers are now absent from this biome. this shift to angiosperm dominance also coincided with a large decline in atmospheric co2 concentration (ca). we compared growth and physiological performance of two lowland tropical angiosperms and conifers at ca levels representing pre-industrial (280 ppm), ambient (400 ppm) and eocene (800 ppm) conditions to explore ... | 2016 | 27582361 |
| potential use of leaf biomass, araucaria heterophylla for removal of pb+2. | the present investigation attempt to analyze the biosorption behavior of novel biosorbent, araucaria heterophylla (green plant) biomass, for removal of pb(+2) from solution as the function of initial metal ion concentration, ph, temperature, sorbent dosage and biomass particle size. the maximum biosorption was found to be 95.12% at ph 5 and biosorption capacity (q(e)) of cd(+2) is 9.643 mg/g. the langmuir and freundlich equilibrium adsorption isotherms were studied and observed that freundlich m ... | 2013 | 23819273 |
| efficient biosorption of chromium(vi) ion by dry araucaria leaves. | in this paper, batch removal of hexavalent chromium from aqueous solutions by araucaria heterophylla leaves was investigated. the batch experiments were conducted to study the adsorption of metal species and effect of different ph, contact time, metal concentration, biosorbent concentration, and adsorption capacity. | 2012 | 22237508 |