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Bajo el titulo de Los usurpadores Ayala recogio nueve ficciones
redactadas durante los primeros anos de su exilio. El tema central
es que "el poder ejercido por el hombre sobre su projimo es siempre
una usurpacion." El autor nos ofrece unos cuadros o ejemplos,
inspirados en el pasado espanol que sirven de espejo para cualquier
epoca y lugar. Su tematica, a la vez poetica y universal, y su
estilo, elegante y ajustado, le han convertido en un clasico de las
Letras Hispanicas.
"The present book is intended as a progress report on the]
synthetic approach to evolution as it applies to the plant
kingdom." With this simple statement, G. Ledyard Stebbins
formulated the objectives of "Variation and Evolution" in Plants,
published in 1950, setting forth for plants what became known as
the "synthetic theory of evolution" or "the modern synthesis." The
pervading conceit of the book was the molding of Darwin's evolution
by natural selection within the framework of rapidly advancing
genetic knowledge.
At the time, "Variation and Evolution" in Plants significantly
extended the scope of the science of plants. Plants, with their
unique genetic, physiological, and evolutionary features, had all
but been left completely out of the synthesis until that point.
Fifty years later, the National Academy of Sciences convened a
colloquium to update the advances made by Stebbins.
This collection of 17 papers marks the 50th anniversary of the
publication of Stebbins' classic. Organized into five sections, the
book covers: early evolution and the origin of cells, virus and
bacterial models, protoctist models, population variation, and
trends and patterns in plant evolution.
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