953 resultados para Devonian Period
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Agreed-upon procedures report on the City of Mount Ayr, Iowa for the period July 1, 2013 through June 30, 2014
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The objective of this work was to evaluate the effects of temperature (10, 20, 30, 20/10 and 30/10ºC) and period of storage on electrical conductivity (EC) in four seed lots of corn (Zea mays L.), as well as the mineral composition of the soaking solution. EC test determines indirectly the integrity of seed membrane systems, and is used for the assessment of seed vigor, because this test detects the seed deterioration process since its early phase. The research comprised determinations of water content, germination, accelerated aging (AA), cold (CT) and EC vigor tests, and determinations of Ca2+, Mg2+ and K+ release to the solution, after seed soaking of four corn seed lots. The evaluations were performed each four months during a period of 16 months. For statistical analysis, a completely randomized split plot design was used with eight replications. Except for seed lots stored at 10ºC, all vigor evaluations revealed a decline in vigor, but AA and CT showed more sensitiveness to declines of seed physiological quality than EC. Potassium was the main leached ion regardless of the storage temperature.
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New plate-tectonic reconstructions of the Gondwana margin suggest that the location of Gondwana-derived terranes should not only be guided by the models, but should also consider the possible detrital input from some Asian blocks (Hunia), supposed to have been located along the Cambrian Gondwana margin, and accreted in the Silurian to the North-Chinese block. Consequently, the Gondwana margin has to be subdivided into a more western domain, where the future Avalonian blocks will be separated from Gondwana by the opening Rheic Ocean, whereas in its eastern continuation, hosting the future basement areas of Central Europe, different periods of crustal extension should be distinguished. Instead of applying a rather cylindrical model, it is supposed that crustal extension follows a much more complex pattern, where local back-arcs or intra-continental rifts are involved. Guided by the age data of magmatic rocks and the pattern of subsidence curves, the following extensional events can be distinguished: During the early to middle Cambrian, a back-arc setting guided the evolution at the Gondwana margin. Contemporaneous intra-continental rift basins developed at other places related to a general post-PanAfrican extensional phase affecting Africa Upper Cambrian formation of oceanic crust is manifested in the Chamrousse area, and may have lateral cryptic relics preserved in other places. This is regarded as the oceanisation of some marginal basins in a context of back-arc rifting. These basins were closed in a mid-Ordovician tectonic phase, related to the subduction of buoyant material (mid-ocean ridge?) Since the Early Ordovician, a new phase of extension is observed, accompanied by a large-scale volcanic activity, erosion of the rift shoulders generated detritus (Armorican Quartzite) and the rift basins collected detrital zircons from a wide hinterland. This phase heralded the opening of Palaeotethys, but it failed due to the Silurian collision (Eo-Variscan phase) of an intra-oceanic arc with the Gondwana margin. During this time period, at the eastern wing of the Gondwana margin begins the drift of the future Hunia microcontinents, through the opening of an eastern prolongation of the already existing Rheic Ocean. The passive margin of the remaining Gondwana was composed of the Galatian superterranes, constituents of the future Variscan basement areas. Remaining under the influence of crustal extension, they will start their drift to Laurussia since the earliest Devonian during the opening of the Palaeotethys Ocean. (C) 2008 Elsevier B.V. All rights reserved.
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Agreed-upon procedures report on the City of Lacona, Iowa for the period December 1, 2013 through November 30, 2014
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Agreed-upon procedures report on the City of Lansing, Iowa for the period July 1, 2013 through June 30, 2014
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Agreed-upon procedures report on the City of Armstrong, Iowa for the period October 1, 2013 through September 30, 2014
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Special investigation of the City of Garwin for the period January 1, 2001 through April 30, 2014
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Report on a special investigation of the Shenandoah Community School District for the period July 1, 2012 through September 30, 2014
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Report on a special investigation of the City of Moorland for the period January 1, 2008 through October 31, 2013
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Report on a special investigation of the West Des Moines Community School District - Western Hills Elementary School for the period May 22, 2012 through March 31, 2015
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Report on a review of the 8 Judicial Districts Department of Correctional Services for the period July 1, 2009 through June 30, 2014
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Report on selected computer systems operated by the State of Iowa for the period July 1, 1999 through June 30, 2014
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Agreed-upon procedures report on the City of Hills, Iowa for the period October 1, 2013 through September 30, 2014
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Agreed-upon procedures report on the City of Kelley, Iowa for the period November 1, 2013 through October 31, 2014
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Agreed-upon procedures report on the City of Tiffin, Iowa for the period July 1, 2013 through June 30, 2014
