Deanna L. Christensen

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A new technique for the selective isolation of actinomycetes from natural mixed microbial populations is described. A nutrient agar medium was overlaid with a 0.22- to 0.45-microns-pore cellulose ester membrane filter, and the surface of the filter was inoculated. During incubation, the branched mycelia of the actinomycetes penetrated the filter pores to(More)
Goldenseal, Hydrastis canadensis L. (Ranunculaceae), is a perennial woodland herb of eastern North America harvested for the medicinal properties of its rhizome. Although listed in Appendix II of the Convention on Trade in Endangered Species, little is known of its population dynamics in the core of its historical range. We investigated the demography of(More)
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