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An antigen from Parthenium hysterophorus Linn.

The increasing incidence of contact dermatitis due to the wild growth of the weed Partheium hysterophorus Linn. in many parts of India has prompted chemical analysis coupled with clinical testing to isolate the offending agent. Results are present to show that parthenin, a sesquiterpene lactone, is the major antigen which produces contact dermatitis in sensitive human beings.

Allergens↗

Histochemical techniques to localize rubber in guayule (Parthenium argentatum Gray).

There are few histochemical techniques for staining rubber in the cells of guayule. With regard to specificity, clarity and retention of the stain we found staining with oil red O or iodine-potassium iodide for bright field, and a combination of oil red O and dansyl chloride for epifluorescence microscopy to be the best methods. The plausible mechanisms of staining are discussed.

Azo Compounds↗