Showing papers on "Terpene published in 1972"

Chemosystematic studies in the genus Pseudotsuga. I. Leaf oil analysis of the coastal and Rocky Mountain varieties of the Douglas fir

Abstract: The volatile leaf oils of the coastal and Rocky Mountain varieties of the Douglas fir were found to have distinctive terpene compositions. The relative amounts of l-β-pinene, sabinene, 3-carene, α- and γ-terpinene, terpinolene, l-terpinen-4-ol, citronellol, citronellyl and geranyl acetate (relatively large in the former variety); and santene, tricyclene, l-camphene, limonene, and l-bornyl acetate (relatively large in the latter variety) may serve as distinguishing features. n-Hexenal, l-α-pinene, α- and β-phellandrene, linalool, fenchyl alcohol, and l-α-terpineol were also isolated. The within-tree and within-population variation of the amounts of these terpenes as well as populational differences from Calgary through the foothills to Revelstoke were small. Intermediate compositions were encountered as far west as the Cascades and one may distinguish clearly between interior and coastal intermediate terpene patterns. Between Keremeos and Hedley the terpene pattern was essentially that of the Rocky Mountai...

Inhibitory effects of foliage extracts of some forest trees on commercial bacillus thuringiensis

Abstract: The antibiotic effects of foliage extracts of some forest trees on commercial Bacillus thuringiensis (Berliner) var. galleriae were studied with a view to determining whether or not such substances might be inhibitory to development and multiplication of ingested bacteria. The results indicate that ethyl acetate and petroleum or ethyl ether extracts of the trees tested were particularly inhibitory to the bacteria. Of 24 pure terpenes tested, pinene, pulegone, menthone, 4-terpineol, citral, citronellol, and linalool were highly inhibitory to the production of spores and crystals by the bacteria.

Biosynthesis. Part XIX. Concerning the biosynthesis of (–)-camphor and (–)-borneol in Salvia officinalis

Abstract: Salvia officinalis is selected after extractions and tracer experiments as a suitable species for biosynthetic work on bicyclic monoterpenes. [2-14C]Geraniol is synthesised and is shown to be incorporated specifically by S. officinalis plants into camphor and borneol by unambiguous degradation of the isolated terpenes. Comment is made on results which emphasise the dangers of reliance on g.l.c. purification of terpenes for radio-tracer work.

cis-Terpin Hydrate Metabolism by a Brevibacterium: Patterns of Enzyme Induction, and Accumulation of α-Terpineol in Growth Media

Abstract: A brevibacterium, strain TH-4, previously isolated by aerobic enrichment on the monocyclic monoterpenoid cis-terpin hydrate as a sole carbon and energy source, was found to grow on α-terpineol and on a number of common sugars and organic acids. Oxidation of these terpenoids was shown to occur via an induced enzyme system, as measured manometrically by oxygen uptake and prevention of protein synthesis with chloramphenicol or puromycin. Oxidation of terpin hydrate by cell suspensions appeared to be coincidentally induced by growth on α-terpineol, and oxidation of α-terpineol similarly appeared to be induced by growth on terpin hydrate. Culture fluids in which the TH-4 organism was grown at the expense of cis-terpin hydrate were found to contain (−)-α-terpineol in combined butanol-ether extracts. The isolated compound was shown to be chromatographically and spectrophotometrically identical to an authentic sample of α-terpineol. The stereospecificity of an enzymatic dehydration of terpin hydrate to α-terpineol is considered.