The major goal of developmental neurobiology is to understand how the nervous system is put together. A central theme that has emerged from research in this field over the last several decades is the crucial role of trophic interactions in neural assembly, and indeed throughout an animal's life. Trophic—which means nutritive—refers to long-term interdependencies between nerve cells and the cells they innervate.
The theory of trophic effects presented in this book offers an explanation of how the vertebrate nervous system is related to—and regulated by—the body it serves. The theory rationalizes the nervous system's accommodation, throughout life, to the changing size and form of the body it tenants, indicating the way connections between nerve cells change in response to stimuli as diverse as growth, injury, experience, and natural selection.
Dale Purves, a leading neurobiologist best known for his work on the formation and maintenance of synaptic connections, presents this theory within the historical setting of earlier ideas about neural organization—from Weiss's theory of functional reorganization to the chemoaffinity theory championed by Sperry. In addition to illuminating eighty years of work on trophic interactions, this book asks its own compelling questions: Are trophic interactions characteristic of all animals or only of those with complex nervous systems? Are trophic interactions related to learning? What does the trophic theory of neural connections imply about the currently fashionable view that the nervous system operates according to Darwinian principles?
Purves lays the theoretical foundation for practical exploration of trophic interactions as they apply to neural connections, a pursuit that will help us understand how our own nervous systems generate change. The ideas in this book not only enrich neurobiology but also convey the profound relevance of neuroscience to other fields of life science.
Papers of the Laboratory of Tree-Ring Research, No. 4
During the nineteenth century, British-owned railways grew under the protection of an Argentine ruling elite that considered railways both instruments and symbols of progress. Under this program of support for foreign enterprise, Argentina had by 1914 built the largest railway network in Latin America.
During the first decades of the twentieth century, the railways were successful in following a policy of calculated disregard for Argentine interests in general. However, following the end of World War I, the British economic empire began to decline and Argentine economic nationalism grew. A number of popularistic political movements incorporated economic nationalism into their platforms, and even among the ruling elite there were signs of increasing nationalistic sentiment.
Although most studies of economic nationalism have emphasized the importance of the middle-class Radical party in the rise of xenophobia, Winthrop R. Wright's study shows that antiforeign economic nationalism was not entirely a reaction to the conservative elite. Between 1932 and 1938 the nationalistic programs of General Agustin Justo's government—basically a conservative regime—led the British interests to decide to sell their holdings. The British govemment had arrived at a position of supporting the economic withdrawal of the large British-owned firms long before Juan D. Perón appeared on the political scene.
Perón combined traditional Argentine economic nationalism with his own scheme to gain power over all elements in Argentina. His solution to the railway problem, although more dramatically executed, did not differ greatly from that of the conservative Justo. Perón purchased the railways outright in 1947–1948, but his use of nationalism was in reality covering his own inability to outbargain Britain and the United States following the conclusion of World War II.
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