Chemotypes species

Recent work identifying Plagiochila retrorsa Gottsche from collections made in the Azores and Madeira establishes a significant range extension for a taxon, known under several other names, which occurs in the southern Appalachian Mountains and in Costa Rica. Rycroft et al. (2001) described morphological and phytochemical characteristics of representative specimens of this liverwort. Phytochemically, P. retrorsa belongs to the 9,10-dihydrophenanthrene chemotype species (major stmctural type is that of compounds 449 and 450). 

Myrtaceae), known locally as kanuka. Fifty-one specimens from New Zealand along with six from Australia (and other species of Kunzea) were included in the study. Oils from Australian and New Zealand specimens were quite similar with a-pinene as the most prominent component in both, along with lower but similar levels of p-cymene and 1,8-cineole. Although two chemotypes can be defined within this taxon, they occur within populations and do not show the geographic patterning seen in manuka. 

Studies of the essential oils of Thymus species have documented the existence of several chemotypes with greater or lesser geographical distinctions among them. In an examination of the essential oils of T. vulgaris L. native to France, Granger and Passet (1973) described six chemical phenotypes based upon the occurrence of a number... 

The authors discounted the existence of two chemotypes of L. dulcis on the grounds that no evidence appears to exist as to this level of plasticity in this species. Rather, they suggested that the problem likely arose in the source of the Mexican specimen, which consisted of plants collected in the vicinity of Tlayacapan (Morelos) and mixed with hierba dulce purchased in a market in Mexico City. Adulteration of the commercial product, not an uncommon practice, likely accounts for the striking chemical differences between the two specimens. 

Cyperus rotundus L. is a weedy species, native to India, but widely distributed in countries on the Pacific Rim and islands in the Pacific Basin. Commonly referred to as purple nut sedge, it has been known in the Hawaiian Islands since the middle of the nineteenth century. In addition to its weedy nature, the taxon has attracted attention because of the antifebrile activity of its rhizomes. Chemical studies have disclosed the presence of several sesquiterpene derivatives, some of which have been implicated in the plant s medicinal use (cyperene and cyperinerol) (Wagner et ah, 1990, p. 1399). Our interest in this species is the existence of several chemotypes with interesting patterns of occurrence involving Pacific Rim countries and several oceanic islands, including the Hawaiian Islands, islands in the southern Pacific, and the Philippines. 

Shore, J. S. and Christ, C. M. 1992. Variation in cyanogenesis within and among populations and species ofTumem section Canaligerae (Tumeraceae). Biochem. Syst. Ecol. 20 9-15. Simeoni, P. and Lehot, V. 2002. Identification of factors determining kavalactone content and chemotype in Kava (Piper methysticum Forst. f). Biochem. Syst. Ecol. 30 413 24. 

We emphasise that the next chapters refer only to the surface of Earth to which light and the atmosphere have access. This is a common restriction in the discussion of evolution but we shall have to examine also the geological and biochemical zones in (and beneath) the deep sea (in Chapter 11), where it appears that evolution could be taking a somewhat different and as yet less advanced route but based on the same principles. We emphasise that each chapter adds new uses of elements, of energy, of space, and of organisation with species variation as new chemotypes evolved. The thermodynamic characteristics of all cells are given in Table 4.11. 

Adjustment of bacteria following the environmental changes initiated by 02 especially, for example, new nitrogen and carbon dioxide metabolism which frequently took place in particular cells, chemotypes and their species. Novel metabolic paths avoided dangerous intermediate products from nitrate and sulfate on the way to H2S and NH3, using Mo and Fe (see Table 6.8). 

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