R Scott Beasley

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Camptotheca (Nyssaceae) is a major source of anticancer camptothecin (CPT). It is imperative to understand CPT accumulation and variations in Camptotheca in order to develop CPT production strategies for endangered germplasm. Our study results showed that CPT is primarily accumulated in glandular trichomes of leaves and stems, and CPT content varies among(More)
Phytochemical investigation on Cnidoscolus texanus led to the isolation of 26 compounds, which included 15 flavonoids (1-15), three coumarins (16-18), three coumaric acid derivatives (19-21), four triterpenoids (22-25), and one phytosterol (26). Among them, aromadendrin 7-O-(4''-O-P-E-coumaroyl-beta-glucopyranoside) (1), aromadendrin(More)
Nine small (2.5 ha) and four large (70-135 ha) watersheds were instrumented in 1999 to evaluate the effects of silvicultural practices with application of best management practices (BMPs) on stream water quality in East Texas, USA. Two management regimes were implemented in 2002: (i) conventional, with clearcutting, herbicide site preparation, and BMPs and(More)
As part of a study on chemical constituents of Camptotheca species, one new natural camptothecin analogue (2), two new alkaloids (3, 4), one new ellagic acid analogue (5), and 19 known compounds (1, 6-23) have been isolated from the root bark, stem bark, fruits, and leaves of Camptotheca acuminata Decaisne. The structures of 2-5 were determined from(More)
Bristlecone pine has been called the world’s oldest known living thing. The tree grows in mountainous terrain near timberline in three southwestern states. Because of the species’ longevity, sensitivity to climatic fluctuations, and unique growth form, it has attracted considerable attention from both scientists and recreationists. This paper discusses(More)
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