Ragweed

Ragweed SC/Pollinex Quatro Agonist Allergic rhinitis (Ragweed) Phase II clinical trials... 

Chamomile Matricaria chamomilla As a tea for gastrointestinal disturbances, as a sedative, and as an anti-inflammatory agent Fbssible contact dermatitis and, in rare instances, anaphylaxis Chamomile is a member of the ragweed family and those allergic to ragweed should not take the herb. 

Jiang, H Rao, K., Halayko, A.J., Liu. X., Stephens, N.L. (1992). Ragweed sensitization-induced increase of myosin light chain kinase content in canine airway smooth muscle. Am. J. Respir. Cell. Mol. Biol. 7, 567-573. 

MH, Townley RG. Mokhtarani M. Seyfert-Margohs V, Asare A. Bateman K. Deniz Y Omalizumab pretreatment decreases acute reactions after rush immunotherapy for ragweed-induced seasonal allergic rhinitis. J Allergy Clin Immunol 2006 117 134-140. 

Plantaginaceae, and Compositae. Ragweed (Ambrosia spp.) is the most important single allergenic plant on the North American continent and affects more of our citizens than does smog. Hay fever and similar allergies from weed pollen cause tremendous... 

In a search for allelopathic agents from common weeds, Amaranthus palmerl S. Wats (Palmer amaranth) and Ambrosia artemisiifolia L. (Louisiana annual ragweed) have been analysed for their organic natural products. From A. palmerl phytol, chondrlllasterol, vanillin, 3-methoxy-4-hydroxynitrobenzene and 2,6-dimethoxy- benzoquinone were isolated. From the roots of Ambrosia artemisiifolia four polyacetylenes, a mixture of sesquiterpene hydrocarbons, methyl caffeate, and a mixture of 8-sitosterol and stlgmasterol were obtained. 

In preparation for the Isolation of allelopathlcs from root exudates of A. artemlsllfolla using the method by Tang and Young (30) we wished to learn first about the major root constituents and possibly establish their structures. We describe here our preliminary findings on the root natural products of Louisiana A. artemlsllfolla populations. Freshly obtained roots of the ragweed,... 

Five-g samples of wheat plant material were soaked in 150 ml of water for 10 hr at room temperature. The mixture was filtered and the filtrate used to germinate pitted morningglory (Ipomoea lacunosa L.) and ragweed (Ambrosia artemisiifolia L.) seed. The effect of the extract on germination was tested in the presence and absence of light. 

The broadleaf weeds responded to tillage in the same general manner when rye root residue was present, however, it does appear that the growth of all the weeds was inhibited by the presence of rye root residue. This can be seen in Table II by comparing results from the tilled treatment with and without rye root residue. In the case of common ragweed, biomass was reduced 34% (178.3 g no rye, till versus 118.3 remove mulch till), but the density increased by 69% (140 plants/2.2 m versus 280 plants/2.2 m ) when rye root... 

Treatment Grass 5 Redrootc,d Pigweed Q Common Lambsquarters c Common Ragweed... 

Table IX. Effect of Light on Morningglory and Ragweed Germination with Aqueous Wheat Extract...

Table XI. Effect of Ferulic Acid on Morningglory, Ragweed, Crabgrass, and Prickly Sida Seed Germination...

Morningglory Ragweed Crabgrass Without Prickly sida Carpel With Carpel... 

Parallel studies of extracts and mixtures of compounds isolated from ragweed, Ambrosia artemisiifolia L., were also made. Water extracts of ragweed proved highly inhibitory of seed germination. Mixed sesquiterpenes isolated from ragweed were very inhibitory of onion, oat, ryegrass, and Palmer amaranth germination when applied in a dichloromethane solution pretreatment. 

Table I. Seed Species Used to Determine In Vitro Germination Regulatory Activity of Palmer Amaranth and Ragweed Extracts...

Table VII. Effect of Ragweed (Ambrosia artemisiifolia) Aqueous Leaf Extract on Seed Germination... 

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