01876nas a2200229   4500008004100000245010300041210006900144260013900213300001400352490000700366520101900373653002401392653001801416653001301434653001401447653001301461653001201474653001101486653004001497100001201537856009701549       2001                        eng d00aVolatile oil variability in Thymus serpylloides ssp. gadorensis growing wild in Southeastern spain0 aVolatile oil variability in Thymus serpylloides ssp gadorensis g  aAffiliation: Geology Department, Fac. of Math. and Natural Sciences, Bergen University, Allégaten 41, 5007-Bergen, Norwayc2001/02//  a189 - 1980 v293 aVolatile oils from single plants of Thymus serpylloides ssp. gadorensis were collected from Southeastern Spain and studied to check for chemical variability using gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). Many of the samples showed a phenolic chemotype, while another important group had significant levels of linalool. Geraniol, myrcene, caryophyllene oxide, terpinen-4-o1 and 1,8-cineole were commonly present. Principal Component Analysis (PCA) and Cluster Analysis (CA) of this chemical variability separated two groups of plants characterized by either phenols or linalool, and an isolated third type with geraniol. A few samples were found to have both phenolic and non-phenolic compounds in high quantities, thus showing a mixed chemotype. Multidimensional scaling analysis (MDS) of the percentage concentration for each component of the essential oil showed that thymol, linalool, 1,8-cineole, borneol and geraniol have clear divergent vectors. © 2001 Elsevier Science Ltd.10acaryophyllene oxide10aEssential oil10aGeraniol10aLamiaceae10aLinalool10aMyrcene10aThymol10aThymus serpylloides ssp. gadorensis1 aSaez, F  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0035177231&partnerID=40&rel=R6.5.001776nas a2200229   4500008004100000245008400041210006900125260014300194300001400337490000700351520095700358653000601315653001401321653001201335653001801347653001801365653001401383653001801397653002001415100001401435856009701449       1999                        eng d00aEssential oil variability of Thymus baeticus growing wild in southeastern Spain0 aEssential oil variability of Thymus baeticus growing wild in sou  aAffiliation: Depto. de Biologia Veg.(Botanica), Facultad de Biología, Universidad de Murcia, 30.100-Espinardo (Murcia), Spainc1999/04//  a269 - 2760 v273 aEssential oils of Thymus baeticus collected from southeastern Spain were analysed using gas chromatography and gas chromatography-mass spectrometry techniques, to check for chemical variability The sampled individuals showed important differences in their content of 1,8-cineole, borneol, linalool, geranial, tr-sabinene hydrate and terpinen-4-ol with some strong inter-relationships between these compounds. Thymol and carvacrol were recorded only in small quantities. Principal component analysis and cluster analysis revealed great variability, with the samples being quite isolated and distancing from each other, although a major group of individuals characterized by terpinen-4-ol was detected. Multidimensional scaling analysis of the percentage concentration for each identified component of the essential oil showed terpinen-4-ol, 1,8-cineole and borneol to be the most divergent components. (C) 1999 Elsevier Science Ltd. All rights reserved.10a110a8-cineole10aBorneol10aChemotaxonomy10aEssential oil10aLamiaceae10aTerpinen-4-ol10aThymus baeticus1 aSáez, F  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0033121007&partnerID=40&rel=R6.5.002432nas a2200277   4500008004100000245008900041210006900130260027100199300001400470490000700484520128500491653001901776653001101795653003001806653001401836653002401850653002001874100002901894700001701923700002001940700002701960700001801987700003402005700001802039856009702057       2000                        eng d00aEssential oil composition and variability of Thymus lotocephalus and Thymus x mourae0 aEssential oil composition and variability of Thymus lotocephalus  aAffiliation: Laboratório de Farmacognosia, Faculdade Farmacia, Univ. C., Coimbra, Portugal; Affiliation: Unitat de Farmacol. I Farmacog., Facultat Farmacia, Univ. B., Barcelona, Spain; Affiliation: Departament de Quimiometria, Inst. Quimic de Sarria, E-c2000/06//  a457 - 4700 v283 aThe composition of the essential oils of four populations of Thymus lotocephalus G. Lopez and R. Morales and one population of T. x mourae Paiva and Salgueiro, two endemic taxa from Portugal, was investigated mainly by GC and GC-MS. T x mourae is a natural hybrid between T. lotocephalus and T. mastichina (L.) L. subsp, donyanae R. Morales, which essential oil was analysed for the first time. In its oil, it was possible to find compounds of both parents, which could enable us to confirm its intermediate status between those two taxa. 1,8-Cineole and borneol were the main constituents in the essential oil of T. x mourae, whereas linalool, geranyl acetate and 1,8- cineol were the major ones in T. lotocephalus. Intermedeol was also an important constituent in the oils of both taxa. Nevertheless, the volatile oils of the four populations investigated of T. lotocephalus showed important differences among the main constituents. In order to study their infraspecific variability, the results obtained in the analysis of individual plants were submitted to a Principal Component and Chemometric Cluster Analyses. Five types of essential oils were found: linalool, 1,8-cineole, linalool/1,8-cineole, linalyl acetate/linalool and geranyl acetate. (C) 2000 Elsevier Science Ltd.10aEssential oils10aGC- MS10aInfraspecific variability10aLamiaceae10aThymus lotocephalus10aThymus x mourae1 aSalgueiroa, Lı́gia, R.1 aVilab, Roser1 aTomàsc, Xavier1 aCañigueralb, Salvador1 aPaivad, Jorge1 ada Cunhaa, António, Proença1 aAdzet, Tomàs  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0034101406&partnerID=40&rel=R6.5.002405nas 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=R6.5.001867nas a2200217   4500008004100000245011900041210006900160260021900229300001400448490000700462520085300469653002601322653001801348653002901366653001801395653001401413653002301427100001501450700002501465856015901490       2005                        eng d00aInfluence of environmental and genetic factors on the stability of essential oil composition of Thymus pulegioides0 aInfluence of environmental and genetic factors on the stability   aAffiliation: Institute of Botany, Zaliuju ezeru 47, LT-2021 Vilnius, Lithuania; Affiliation: Department of Food Technology, Kaunas University of Technology, Radvilenu̧ pl. 19, Kaunas LT-50015, Lithuaniac2005/05//  a517 - 5250 v333 aThymus pulegioides plants were collected from various natural habitats of Lithuania and transferred into a new uniform environment. The plants were cloned annually at controlled conditions and their essential oil composition was monitored by capillary GC and GC/MS. The geraniol/geranial/neral (G/G/N), thymol (T), linalool (L), carvacrol/γ-terpinene/p-cymene (C/γT/pC) and thymol/carvacrol/γ-terpinene/p-cymene (T/C/γT/pC) chemotypes of T. pulegioides were studied. It was found that according to the stability of essential oil composition on a sudden change of environmental conditions two types of T. pulegioides can be distinguished: (1) plants which preserve their chemical composition of the essential oils; (2) plants, which considerably change their chemical composition of the essential oils. © 2004 Elsevier Ltd. All rights reserved.10achemical polymorphism10aenvironmental10aEnvironmental conditions10aEssential oil10aLamiaceae10aThymus pulegioides1 aLoziene, K1 aVenskutonis, P.R., R  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-14944377694&partnerID=40&rel=R6.5.0http://linkinghub.elsevier.com/retrieve/pii/S030519780400266201736nas a2200253   4500008004100000245009300041210006900134260021700203300001400420490000700434520073900441653001201180653001201192653002301204653001801227653003001245653001401275653003001289100002001319700001201339700001801351700001601369856009701385       1998                        eng d00aComposition and infraspecific variability of essential oil from Thymus herba barona Lois0 aComposition and infraspecific variability of essential oil from   aAffiliation: Université de Corse, Equipe Chimie et Biomasse, CRES-URA CNRS 2053, Route des Sanguinaires, 20000 Ajaccio, France; Affiliation: Université de Corse, CEVAREN, BP 52, 20250 Corte, Francec1998/12//  a915 - 9320 v263 aThe composition of the essential oils of individual plants of Thymus herba barona Lois. growing wild in Corsica was investigated by GC, GC/MS an carbon-13 NMR. Eight groups of essential oil were distinguished: (i) thymol, (ii) carvacrol; (iii) linalool, (iv) geraniol, (v) alpha-terpenyl acetate, (vi) terpinen-4-ol, (vii) carvone and cis-dihydrocarvone. Three chemotypes -thymol, carvacrol and linalool - are common in the genus Thymus, two others - geraniol, a-terpenyl acetate - are scarce, while the latest three ones - terpinen-4-ol, carvone and cis-dihydrocarvone are quite original. It is the first time that the cis-dihydrocarvone chemotype is described in the genus Thymus. (C) 1998 Elsevier Science Ltd. All rights reserved.10a13C NMR10aCarvone10aCis-dihydrocarvone10aEssential oil10aInfraspecific variability10aLamiaceae10aThymus herba barona Lois.1 aCorticchiato, M1 aTomi, F1 aBernardini, A1 aCasanova, J  uhttp://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0032391340&partnerID=40&rel=R6.5.0