997 resultados para Africa, Northern


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Report on the University of Northern Iowa for the year ended June 30, 2009

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Report on a review of selected general and application controls over the University of Northern Iowa Accounts Payable/Purchasing System for the period of June 10, 2009 through August 20, 2009

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Report on a review of selected application controls over the University of Northern Iowa Non-Student Accounts Receivable System for the period June 10, 2010 through July 23, 2010

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Audit report of the University of Northern Iowa, Cedar Falls, Iowa, as of and for the years ended June 30, 2010 and 2009

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The Cenozoic QuillaguaLlamara basin (northern Chile, Central Andes) is an asymmetrical, intramassif fore-arc basin with a relatively wide northern sector separated from a narrower southward extension by a basement threshold. The north- ern sector was characterised by a noticeable Oligocene?late Neogene alluvial-fan and lacustrine dominated deposition which resulted in sequences up to 900 m thick, whereas the southern sector was often a bypass zone with thinner fluvial and lacustrine sediment accumulation.

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Report on the University of Northern Iowa for the year ended June 30, 2010

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Report on a special investigation of UNItix, the University of Northern Iowa’s centralized ticketing office, for the period August 1, 2008 through August 31, 2010

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Understanding how natural environments shape phenotypic variation is a major aim in evolutionary biology. Here, we have examined clinal, likely genetically based variation in morphology among 19 populations of the fruit fly (Drosophila melanogaster) from Africa and Europe, spanning a range from sea level to 3000 m altitude and including locations approximating the southern and northern range limit. We were interested in testing whether latitude and altitude have similar phenotypic effects, as has often been postulated. Both latitude and altitude were positively correlated with wing area, ovariole number, and cell number. In contrast, latitude and altitude had opposite effects on the ratio between ovariole number and body size, which was negatively correlated with egg production rate per ovariole. We also used transgenic manipulation to examine how increased cell number affects morphology and found that larger transgenic flies, due to a higher number of cells, had more ovarioles, larger wings, and, unlike flies from natural populations, increased wing loading. Clinal patterns in morphology are thus not a simple function of changes in body size; instead, each trait might be subject to different selection pressures. Together, our results provide compelling evidence for profound similarities as well as differences between phenotypic effects of latitude and altitude.