He concludes that there was significantly more emigration and significantly less mortality in Ireland than is commonly believed. The starting point is a homeostatic population series, which indicates that the English census population total was about 6 percent too high.
Irish Potato Famine Essay examples
Most scholars assume that the total population figure in that census is reliable, although many have questioned the numbers of people that the census assigned to each age group. The lower homeostatic population total for , extrapolated from marriage data, implies that Irish migration to England during the two succeeding decades was at least twice as large as has generally been accepted.
In addition to changing the migration totals, substituting the homeostatic population estimate for the census total would create greater consistency between the population and other English statistics during this period. Skip to Main Content. Search in: This Journal Anywhere. Advanced search.
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The Great Irish Famine Essay Example
Original Article. The study is the first ever to extract and analyze mitochondrial DNA from historic specimens. Previous studies by other researchers, which implicated the 1b haplotype, were conducted using only DNA collected from modern-day late-blight outbreaks. The study's findings have more than just historical significance, she adds, because modern forms of the P.
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Late blight is currently ravaging Russia's potato crop, and smaller-scale epidemics occur every year in Mexico, Ireland, Ecuador and the United States. Potatoes are one of the world's four leading food crops. Late blight poses an especially great threat in developing countries where control measures may be too costly. In their paper, she and her colleagues suggest the pathogen may have originated in South America rather than Mexico, "although much more research is needed before we can know for sure," she stressed, "because the South American collections are not as complete or well-studied as they should be.
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She believes that forensic DNA fingerprinting techniques, similar to those she developed to study P. PCR amplifications were successful from 28 of those.
The specimens were collected in England and Ireland between and and stored at the Royal Botanic Gardens in Kew, England, and other herbariums. To prevent contamination, none of the research was conducted in laboratories or on equipment previously used for Phytophthora studies. For comparison purposes, the researchers also collected mitochondrial DNA from potato leaves infected with late blight in modern epidemics.
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Ristaino's co-authors on the paper are Gregory Parra, an agricultural research specialist in plant pathology at NC State, and Dr. Carol T. Note to editors: The abstract from Ristaino et al's Nature paper follows. Ristaino, Carol T.
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