Thesis (Ph. D.)--Oregon State University, 1977. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 1975. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 1974. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 1972. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 1967. / Typescript (photocopy). Includes bibliographical references (p. 98-101). Also available on the World Wide Web.

Aim of the study: Despite the extensive traditional use of Croton gratissimus Burch. var. gratissimus for medicinal purposes, scientific studies validating the therapeutic properties of this indigenous plant are lacking. As the bark, roots and leaves of C. gratissimus are used separately as well as in combination, this study focused on determining antimicrobial efficacies of the plant parts independently and in combination to assess possible pharmacological interactions (e.g. synergy, antagonism). Material and Methods: The hydro-distilled leaf essential oil and extracts of bark, root and leafwere comparatively assessed for antimicrobial activity by means of microdilution minimum inhibitory concentration (MIC). The fractional inhibitory concentrations (FIC) were determined for the leaf and root (1:1), bark and root (1:1), leaf and bark (1:1) combination. Isobolograms were plotted to demonstrate interactions between various ratios of the roots and leaves. Results: The MIC and FIC results indicated variable efficacies for the various plant part combinations, the greatest of which was noted for Cryptococcus neoformans in the root and leaf combination (MIC 0.4 mg/ml and FIC of 0.4). Isobolograms indicated the greatest synergy for Bacillus cereus, Candida albicans and Cryptococcus neoformans. Conclusion: The observed synergistic interactions clearly indicate that the reductionist approach may often be short-sighted and that biological activity may be improved through combination therapy, where different complex metabolic pools collectively contribute to the enhanced effect.

Thesis (Ph. D.)--Virginia Polytechnic Institute, 1968. / Also available via the Internet.

Thesis (Ph. D.)--Cornell University, 1919. / "Reprinted from Canadian Department of agriculture, Entomological branc, Bulletin 14, part II, 1918." Includes the t.p. of the original issue. Bibliography: p. 139.

Inaug.-Diss.--Landwirtschaftliche Hochschule Hohenheim. / Vita. eContent provider-neutral record in process. Description based on print version record. Bibliography: p. 42-[45].

Thesis (Ph. D.)--Cornell University, 1919. / "Reprinted from Canadian Department of agriculture, Entomological branc, Bulletin 14, part II, 1918." Includes the t.p. of the original issue. Bibliography: p. 139.