Argentatin B is a naturally occurring tetracyclic triterpene isolated from Parthenium argentatum x P. tomentosa. It was microbiologically transformed to 16, 24-epoxycycloartan-3alpha, 25-diol, (isoargentatin D), by Nocardia corallina var. taoka ATCC 31338, Mycobacterium species NRRL B3683 and Septomyxa affinis ATCC 6737. The later microbe also produced 16, 24-epoxycycloartan-3beta, 25-diol (arg...

Metal cofactors are necessary for the activity of alkylation by prenyl transfer in enzyme-catalyzed reactions. Rubber transferase (RuT, a cis-prenyl transferase) associated with purified rubber particles from Hevea brasiliensis, Parthenium argentatum and Ficus elastica can use magnesium and manganese interchangably to achieve maximum velocity. We define the concentration of activator required f...

The direct negative effects of invasive plant species on agriculture and biodiversity are well known, but their indirect effects on human health, and particularly their interactions with disease-transmitting vectors, remains poorly explored. This study sought to investigate the impact of the invasive Neotropical weed Parthenium hysterophorus and its toxins on the survival and energy reserves of...

Knowledge of the link between a vector population's pathogen-transmission potential and its biotic environment can generate more realistic forecasts of disease risk due to environmental change. It also can promote more effective vector control by both conventional and novel means.This study assessed the effect of particular plant species assemblages differing in nectar production on components ...

High perform ance liquid chrom atography was used to quantify the sesquiterpene phenolic esters, G uayulin A and -B in Parthenium argentatum (guayule) and Fj hybrids o f guayule with Parthenium schottii, P. fruticosum var. trilobatum and P. tomentosum var. stramonium. The d istri­ bution o f these phenolic acid esters in all parts o f the plants are reported and their inheritance in hybrids is ...

Near-infrared (NIR) reflectance spectroscopy was used to develop a fast identification method for Echinacea purpurea dried milled roots. Method development was carried out using a PLS (partial least-squares) algorithm and pretreatment options. The aim of this qualitative analysis was to confirm the identity of E. purpurea and to detect the presence of fraud, i.e., samples adulterated or substit...

BACKGROUND Parthenium hysterophorus is the commonest cause of airborne contact dermatitis in India. Azathioprine has been shown to be effective and safe in parthenium dermatitis, but there are no reports of comparison of steroids and azathioprine in this condition. AIMS To study the therapeutic efficacy of azathioprine versus betamethasone in patients having contact dermatitis to parthenium a...

Abstract Background Tripleurospermum disciforme (C.A.Mey.) Sch.Bip., Tanacetum parthenium (L.) and Achillea biebersteinii Afan. are the most important species of Asteraceae family that used in traditional medicine as antiseptics, analgesics, anti-ulcers. This study aimed to evaluate compare yield, chemical profile, antibacterial antifungal properties essential oils these three for first time. F...

Parthenium hysterophorus L., compositae, also known as congress weed, carrot weed, star weed, reaching a height of 2 m in weeks of germination, is believed to have entered India accidentally in the mid 1950's and is now available abundantly all over the India. Leaves are traditionally used in the treatment of asthma and allergy, leavas of the plant were extracted successively using aqueous and ...