When trying to solicit authors for this book it became apparent that the causal factors for heterosis at the physiological and biochemical level are today almost as obscure as they were 30 years ago. Though biometrical-genetical analyses point to dispersion of complementary genes - not overdominance - as the major cause of the phenomenon, plant breeders' experience still suggests a cautious, pragmatic approach to the dominance-overdominance controversy in breeding hybrid cultivars. Thus we are faced with a striking discordance between our limited comprehension of the causal factors and mechanism of heter- osis on the one hand, and the extensive agricultural practice of utiliza- tion of hybrid vigor on the other. Such utilization is the result of the economic value of hybrid combinations displaying superior yields and qualities as well as stability of performance, of benefits derived in breeding programs, and of the enhanced varietal protection of proprietary rights. No comprehensive and critical analysis of the phenomenon of heterosis in economic plants has been published for the last three decades since the now classical book Heterosis, edited by J . W. Gowen (Iowa State College Press, Ames, Iowa, 1952). The present book attempts to fill the gap and to assess the status of our present knowl- edge of the concept, the basis, the extent, and the application of heterosis in economic plants.
Contemporary art can be baffling and beautiful, provocative and disturbing. This pioneering book presents a new look at the controversial period between 1945 and 2000, when art and its traditional forms were called into question. It focuses on the relationship between American and European art, and challenges previously held views about the origins Geopolitics: A Very Short Introduction free epub of some of the most innovative ideas in art of this time. Major artists such as Jackson Pollock, Jasper Johns, Yves Klein, Andy Warhol, Louise Bourgeois, Cindy Sherman, and Damien Hirst are all discussed, as is the art world of the last fifty years. Important trends are also covered including Abstract Expressionism, Pop Art, Minimalism, Conceptualism, Postmodernism, and the art of the nineties. (Piano/Vocal/Guitar Artist Songbook). A native of Ontario who's been musical since she was two, Grammy nominee and self-proclaimed skate punk Avril Lavigne was offered a deal by Arista Records at the tender age of 16. Our matching folio to the highly acclaimed debut from this teen singer/songwriter superstar features the smash hit singles "Complicated" and "Sk8er Boi" and 11 more: Anything but Ordinary * I'm with You * Losing Grip * Mobile * My World * Naked * Nobody's Fool * Things I'll Never Say * Tomorrow * Too Much to Ask * Unwanted.
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Author: R. Frankel
Number of Pages: 292 pages
Published Date: 14 Dec 2011
Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
Publication Country: Berlin, Germany
Language: English
ISBN: 9783642819797
Download Link: Click Here
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