J
J. David Warthen
Researcher at United States Department of Agriculture
Publications - 11
Citations - 1120
J. David Warthen is an academic researcher from United States Department of Agriculture. The author has contributed to research in topics: Brassica & Hemolymph. The author has an hindex of 8, co-authored 11 publications receiving 1037 citations.
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Journal ArticleDOI
Brassinolide, a plant growth-promoting steroid isolated from Brassica napus pollen
Michael D. Grove,Gayland F. Spencer,W. K. Rohwedder,Nagabhushanam Mandava,Joseph F. Worley,J. David Warthen,G. L. Steffens,Judith L. Flippen-Anderson,J. Carter Cook +8 more
TL;DR: The isolation, structure determination and biological activity of this new plant growth promoter, named (22R, 23R, 24S)-2α-3α,22,23-tetrahydroxy-24-methyl-6,7-s-5α-cholestano-6-7-lactone or brassinolide is reported.
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Immune-depression in Rhodnius prolixus induced by the growth inhibitor, azadirachtin
TL;DR: The present experiments, unlike other immune reactions, fail to demonstrate any interference of azadirachtin with the prophenoloxidase-activating system since the melanin production was not reduced when this system was stimulated by trypsin or by the presence of bacteria in the haemolymph.
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Deterrence coding by a larval Manduca chemosensory neurone mediating rejection of a non‐host plant, Canna generalis L.
TL;DR: The physiological basis of phagodeterrence was studied electrophy‐siologically and behaviourally in the phytophagous caterpillars Manduca sexta and Manduca quinquemaculata and the model unacceptable non‐host plant was the canna lily, Canna generalis.
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Phytotoxins in Rhizoctonia solani: isolation and biological activity of m-hydroxy- and m-methoxyphenylacetic acids.
N. Bhushan Mandava,Rodrigo G. Orellana,J. David Warthen,Joseph F. Worley,Samson R. Dutky,Harold Finegold,Billy C. Weathington +6 more
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Furanosesquiterpenoids from Commiphora myrrh oil
Asafu Maradufu,J. David Warthen +1 more
TL;DR: Combined application of NMR, UV, and MS techniques have revealed that oil from C. myrrh gum resins contains isofuranogermacrene, lindestrene, furanoeudesma-1,3-diene, and furanodiene.