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9 hasil
Phototoxicity from furocoumarins (psoralens) of Heracleum laciniatum in a patient with vitiligo. Action spectrum studies on bergapten, pimpinellin, angelicin and sphondin.
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Investigations on light reactions in a patient with vitiligo are presented. The minimal erythema dose (MED) in the UVB area was approximately 1/3 of that in persons of skin type II. The application of furocoumarins (psoralens) increased light tolerance by 1 MED at 300-310 nm. Action spectrum studies
Effects of sphondin, isolated from Heracleum laciniatum, on IL-1beta-induced cyclooxygenase-2 expression in human pulmonary epithelial cells.
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Recently, under large-scale screening experiments, we found that sphondin, a furanocoumarin derivative isolated from Heracleum laciniatum, possessed an inhibitory effect on IL-1beta-induced increase in the level of COX-2 protein and PGE(2) release in A549 cells. Accordingly, we examined in the
[Isolation of sphondin from the roots of the cow parsnip Heracleum dissectum LDB. II].
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The furanocoumarins in the roots of Heracleum sibiricum L.
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From roots of Heracleum sibiricum L (cow parsnip) collected natural state, a raw crystalline furanocoumarin precipitate was obtained containing four compounds: bergapten, isopimpinellin, pimpinellin, sphondin. The isolated compounds were identified with H1NMR.
Lutein sequestration and furanocoumarin metabolism in parsnip webworms under different ultraviolet light regimes in the montane west.
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Both biotic and abiotic selection pressures can contribute to geographic variation in allelochemical production in plants. We examined furanocoumarin production in western North American populations of Heracleum lanatum and Pastinaca sativa that, at different latitudes and altitudes, experience
The Canadian medicinal plant Heracleum maximum contains antimycobacterial diynes and furanocoumarins.
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BACKGROUND
Heracleum maximum is amongst the most commonly used plants by the indigenous peoples of North America. The First Nations of the eastern Canada use infusions of Heracleum maximum roots for the treatment of respiratory ailments including tuberculosis. Previous investigations of extracts
Melanogenesis stimulation in murine b16 melanoma cells by umberiferae plant extracts and their coumarin constituents.
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Melanogenesis stimulation activities of seven ethanolic extracts obtained from Umbelliferae plants used as Chinese crude drugs, namely the roots of Angelica dahurica BENTH. et HOOK., A. biserrata SHEN et YUAN, Notopterygium incisum TING, Heracleum lanatum MICHX., and H. candicans WALL., and the
Furocoumarins of Heracleum laciniatum: isolation, phototoxicity, absorption and action spectra studies.
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Isolation of the furocoumarins (psoralens) bergapten, isobergapten, sphondin, isopimpinellin and pimpinellin from the Umbilliferous plant Heracleum laciniatum was carried out by column chromatography, and the structure and absorption spectra for the 5 furocoumarins isolated are described.
Accidental induction of photocontact allergy to Heracleum laciniatum.
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Photocontact allergy to psoralens in Heracleum laciniatum occurred in two persons volunteering for investigations into phototoxicity of plant homogenates and purified psoralens. Photoallergy was noted following the fifth exposure in case 1, and the sixth in case 2. Testing with diluted solutions
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