منابع مشابه
Photosynthesis in Climatic Races of Mimulus. I. Effect of Light Intensity and Temperature on Rate.
Turesson (14, 15, 16) demonstrated that species occurring in a wide range of climates are composed of genetically distinct races, and developed the concept that such races are products of natural selection. This concept is fundamental to an understanding oi mechanisms underlying natural selection and evolution of higher plants. Extensive later experiments bv other wvorkers on the response and s...
متن کاملArms Races and Car Races
Evolutionary car racing (ECR) is extended to the case of two cars racing on the same track. A sensor representation is devised, and various methods of evolving car controllers for competitive racing are explored. ECR can be combined with co-evolution in a wide variety of ways, and one aspect which is explored here is the relative-absolute fitness continuum. Systematical behavioural differences ...
متن کاملSesquiterpene lactones from Achillea chrysocoma and Achillea coarctata.
The aerial parts of A. chrysocoma and A. coarctata afforded 22 and 9 sesquiterpene lactones, respectively. All the compounds described are new for the studied species. The lactones 5, 6 and 12 are new for the genus Achillea.
متن کاملTerpenoids from Achillea setacea.
The aerial parts of Achillea setacea afforded, in addition of a rare monoterpene triol and 12 known sesquiterpene lactones, a new guaianolide containing an endoperoxide ring. Its structure was elucidated by spectral methods.
متن کاملSesquiterpene Lactones from Achillea
The species of genus Achillea, particularly those belonging to the Achillea millefolium group have received a lot of attention so far, due to their use in traditional medicine. Among the numerous chemical compounds isolated from the A. millefolium species, the sesquiterpene lactones are usually one of the major constituents (Seaman, 1982). Continuing our chemotaxonomic examination of Bulgarian ...
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ژورنال
عنوان ژورنال: Nature
سال: 1949
ISSN: 0028-0836,1476-4687
DOI: 10.1038/163582a0