Download or read book Disegno tecnico Schemi simboli e tolleranze di disegno meccanico e industriale written by and published by . This book was released on 2011 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Schemi simboli e tolleranze di disegno meccanico e industriale written by and published by . This book was released on 2006 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Genetic Conservation written by Nigel Maxted and published by Springer Science & Business Media. This book was released on 2013-12-01 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent development of ideas on biodiversity conservation was already being considered almost three-quarters of a century ago for crop plants and the wild species related to them, by the Russian geneticist N.!. Vavilov. He was undoubtedly the first scientist to understand the impor tance for humankind of conserving for utilization the genetic diversity of our ancient crop plants and their wild relatives from their centres of diversity. His collections showed various traits of adaptation to environ mental extremes and biotypes of crop diseases and pests which were unknown to most plant breeders in the first quarter of the twentieth cen tury. Later, in the 1940s-1960s scientists began to realize that the pool of genetic diversity known to Vavilov and his colleagues was beginning to disappear. Through the replacement of the old, primitive and highly diverse land races by uniform modem varieties created by plant breed ers, the crop gene pool was being eroded. The genetic diversity of wild species was equally being threatened by human activities: over-exploita tion, habitat destruction or fragmentation, competition resulting from the introduction of alien species or varieties, changes and intensification of land use, environmental pollution and possible climate change.
Download or read book The Conservation of Plant Biodiversity written by Otto Herzberg Frankel and published by Cambridge University Press. This book was released on 1995-09-21 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the various options for conserving plants at the level of the gene, species and community.
Download or read book Innovations in Public Administration written by and published by Allied Publishers. This book was released on 2000 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
