02405nas a2200253   4500008004100000245008600041210006900127260015500196300001400351490000700365520146600372653001801838653001501856653001801871653001501889653001401904653002001918653002201938653003501960100001501995700002402010700002002034856009702054       2004                        eng d00aEssential oil polymorphism of Thymus praecox subsp. arcticus on the British Isles0 aEssential oil polymorphism of Thymus praecox subsp arcticus on t  aAffiliation: Abt. Pharmazeut. Biol. Mikrobiol., Institut für Pharmazie, Universität Hamburg, Bundesstrasse 45, D-20146 Hamburg, Germanyc2004/04//  a409 - 4210 v323 aThe essential oils of 732 individual plants of Thymus praecox Opiz subsp. arcticus (E. Durand) Jalas (syn. T. drucei Ronn.) collected in Scotland, Ireland, and in the south of England have been analysed by gas chromatography (GC) and mass spectrometry (GC-MS) in order to elucidate the chemical character of this subspecies on the British Isles. In total, 69 components were identified, most of them monoterpenoids and sesquiterpenoids with hedycaryol, linalyl acetate, linalool, the germacradienols, trans-nerolidol, T-cadinol, and β-caryophyllene being the most important compounds. The analysis of the quantitative essential oil data by means of neural networks revealed that T. praecox subsp. arcticus growing in Britain is highly polymorphous. There were 17 chemotypes with the hedycaryol chemotype as the most frequent (24% of the plants), followed by the linalool/linalyl acetate chemotype (22% of the plants) and germacra-1(10),4-dien-6-ol chemotype (18% of the plants). It seems that each part of the British Isles has its special chemotype pattern with 13 chemotypes in Scotland, 11 in Ireland, and 17 in the south of England. An overview of the North Atlantic region of Europe revealed that the polymorphism of T. praecox subsp. arcticus in the essential oil is more distinctive in the southern than in the northern regions, with only 2, 5, and 1 chemotypes in Greenland, Iceland, and Norway, respectively. © 2004 Elsevier Ltd. All rights reserved.10aBritish Isles10aChemotypes10aEssential oil10aHedycaryol10aLamiaceae10alinalyl acetate10aNeuronal networks10aThymus praecox subsp. arcticus1 aSchmidt, A1 aBischof-Deichnik, C1 aStahl-Biskup, E  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-1642372459&partnerID=40&rel=R6.5.002509nas a2200253   4500008004100000245016400041210006900205260010600274300001000380490000700390520152100397653000901918653001801927653001401945653001401959653005301973653002502026653001602051653002902067100002402096700001802120700002002138856009702158       2000                        eng d00aMultivariate statistical analysis of the essential oil composition of Thymus praecox Opiz ssp polytrichus (Kern. ex Borb,) Ronn. collected in the Tyrolean Alps0 aMultivariate statistical analysis of the essential oil compositi  aAffiliation: Lehrst. Pharmazeut. Biol. der Univ., Bundesstrasse 43, D-20146 Hamburg, Germanyc2000///  a1 - 60 v153 aThe essential oils of 141 individual plants of Thymus praecox Opiz ssp. polytrichus (Kern. ex Borb.) Ronn., emend. Jalas, collected at 16 localities in the Austrian and Italian Alps (Tyrol and South Tyrol), were investigated concerning their composition and the variations therein. In total, 60 components, almost exclusively monoterpenes and sesquiterpenes, were identified by GC and GC-MS. The patterns of the oils were processed by means of multivariate statistical analysis (MSA) including factor analysis (FA), cluster analysis (CA) and discriminant analysis (DA). The most plausible result, revealing 12 clusters, was obtained by a modified CA method based on the average linkage method with the Pearson correlation. Considering all other statistical results obtained, 12 oil types became evident with the following type-characterising compounds: thymol, geraniol/geranyl acetate, trans-sabinene hydrate/terpinen-4-ol, α-terpineol, linalol, linalol/linalyl acetate, borneol, trans-nerolidol, hedycaryol, T-cadinol, germacra-1(10),5-dien-4-ol, and germacra-1(10),4-dien-6-ol. All these oil types have been found before in other Thymus species. The thymol type, found for 46 samples, represented the most dominant oil type. The chemical similarity with Mediterranean and North Atlantic Thymus species indicates a mixing of southern and northern elements in the Alps, which is also reflected in the overlapping morphological characters of T. praecox ssp. polytrichus. Copyright (C) 2000 John Wiley and Sons, Ltd.10aAlps10aEssential oil10aLamiaceae10aOil types10aPolytrichus (Kern. ex. Borb.) Ronn. emend. Jalas10aStatistical analysis10aThymol type10aThymus praecox Opiz ssp.1 aBischof-Deichnik, C1 aHoltuijzen, J1 aStahl-Biskup, E  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0034062952&partnerID=40&rel=R6.5.0