Showing papers on "Chrysanthemum indicum published in 1975"
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13 citations
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TL;DR: Tomato aspermy virus was found in chrysanthemum in New Zealand for the first time, in commercial gardens in Christchurch, Wanganui, and Auckland.
Abstract: Tomato aspermy virus was found in chrysanthemum in New Zealand for the first time, in commercial gardens in Christchurch, Wanganui, and Auckland. The virus was transferred experimentally to marigold, nasturtium, aster, capsicum, chrysanthemum, tamarillo, lettuce, tomato, Nicotiana glutinosa L., Chenopodium amaranticolor Coste & Reyn., tobacco, black nightshade. New Zealand spinach, and zinnia. The longevity of the virus was between 7 and 11 days and the thermal inactivation point between 65° and 70°c. The dilution end point of the virus was between 1–50 000 and 1–100 000. The virus was transmitted by the green peach aphid.
7 citations
01 Jan 1975
TL;DR: Investigations indicated that several other terpenic compounds are present, which gave positive color reactions to certain lactone reagents, and five of them showed strong positive patch test reactions in patients as well as in sensitized guinea pigs.
Abstract: Experimental studies on allergic contact dermatitis due to Chrysanthemum indicum 1. (Chrysanthemum x-morifolium) (chrysanthemum of the florists) have indicated the following results: 1. In 5 patients with allergic contact dermatitis from chrysanthemum oil of turpentine and its sensitizing compounds gave no patch test responses. No relationship between contact allergy due to chrysanthemus and to turpentine oil could be determined. 2. The pyrethrins, constituents with insecticidal activity, derived from certain Chrysanthemum species and often suspected as the causative agents, play no role in chrysanthemum allergy. 3. Tests on sensitized guinea pigs (pirl bright white strain) with flowers of chrysanthemum as well as with the two sesquiterpene lactones parthenolide and alantolactone, derived from different Composite species, gave positive patch test reactions. The results showed that parthenolide produced stronger reactions than alantolactone. 4. By thin layer chromatography neither parthenolide, nor alantolactone or pyrethrosin could be detected in extracts of chrysanthemum flowers of the florists. But the investigations indicated that several other terpenic compounds are present, which gave positive color reactions to certain lactone reagents. Five of them showed strong positive patch test reactions in our patients as well as in sensitized guinea pigs. Further studies are required to identify these compounds.
6 citations