Search results for " American"
showing 10 items of 425 documents
Subduction of the Nazca Ridge and the Inca Plateau: Insights into the formation of ore deposits in Peru
2005
A large number of ore deposits that formed in the Peruvian Andes during the Miocene (15-5 Ma) are related to the subduction of the Nazea plate beneath the South American plate. Here we show that the spatial and temporal distribution of these deposits correspond with the arrival of relatively buoyant topographic anomalies, namely the Nazca Ridge in central Peru and the now-consumed Inca Plateau in northern Peru, at the subduction zone. Plate reconstruction shows a rapid metallogenic response to the arrival of the topographic anomalies at the subduction trench. This is indicated by clusters of ore deposits situated within the proximity of the laterally migrating zones of ridge subduction. It …
Speculations on the impact of catastrophic subduction initiation on the Earth System
2016
Abstract The physics of subduction initiation can be studied with numerical models of lithosphere dynamics, to the extent where we can now test the potential consequences of a catastrophic subduction initiation event on the Earth System. The South American Atlantic passive margin is here used to show that, once subduction has catastrophically initiated there, a major geodynamic reconfiguration of the South American plate (SAm) is likely to take place: (1) compression in the east will be inverted to extension, because ridge push will be replaced by subduction rollback and trench retreat; (2) compression in the west will be inverted to extension due to absolute rollback; and (3) without buttr…
Tectonic evolution of the Sierra Maestra Mountains, SE Cuba, during Tertiary times: From arc-continent collision to transform motion
2008
Abstract A structural study was carried out along the southern Sierra Maestra mountain range, SE Cuba. This was aimed to monitor the effects of Paleogene island arc formation and collision due to convergence of the Caribbean and North American plates and subsequent Neogene disruption of the arc by initiation of the North Caribbean Transform Fault. In the Sierra Maestra two different and unrelated volcanic arcs are exposed, one of Cretaceous age (pre-Maastrichtian) and the other of Paleogene age, the latter forming the main expression of the mountain range. The volcanic arcs are overlain by Middle–Upper Eocene siliciclastic, carbonate and terrigenous rocks. Six distinct phases of deformation…
The Habitual ‘Saber + Infinitive’ in South American Spanish
2022
The present paper aims to describe both synchronic and diachronic distributions of the habitual aspectual periphrasis ‘saber + infinitive’ in the varieties of Spanish spoken in the South American continent. The data used for the present analysis come from the Corpus de Referencia del Español Actual and the Corpus del Español del Siglo XXI.
Le récit d’esclave africain-américain : réflexions sur une appellation générique
2015
What do we talk about when we talk about 'slave narratives?' African American slave narratives have been a staple of American literary studies over the past decades. The narratives of Frederick Douglass, Harriet Jacobs and other ex-slaves have been recovered, anthologized and discussed by eminent critics such as Marion Wilson Starling, Henry Louis Gates Jr., Frances Smith Foster and William L. Andrews. For all its ubiquity, however, the generic label 'slave narrative' has been used in many different ways by specialists of African American literature. In this essay I argue that the systematic and sometimes uncritical use of the label has led to generalizations that limit our understanding of…
Pēckara amerikāņu vēstures interpretācija Čanga Reja Lī romānā Nodotie
2019
Bakalaura darba mērķis ir izanalizēt ASV vēstures reprezentāciju Čanga-reja Lī vēsturiskajā romānā Nodotie no transnacionālā viedokļa. Pētījuma mērķa sasniegšanai, tiek izmantotas tādas metodes kā žanra un teksta analīze, akcentējot uzmanību uz romāna tēmām un varoņiem, kā arī izmantojot transnacionālo pieeju konteksta interpretācijai. Empīriskajā daļā tiek apspriests kāpēc Nodotie pieder pie vēsturiskā romāna žanra. Turklāt, galveno varoņu traumatisko pieredžu un likteņu krustošanās nozīme romānā. Analizējot tiek noskaidrota romāna pozīcija Āzijas amerikāņu literatūrā, kā arī kādā veidā tā veicina ASV vēstures pārskatīšanu.
Ancestors of two-spirits: representations of native American third-gender males in historical documentation : a critical discourse analysis in anthro…
2005
Booker T. Washington's moderate means to racial harmony : the ascendancy of the African American educator 1881-1915
1997
In-Field LAMP Detection of Flavescence Dorée Phytoplasma in Crude Extracts of the Scaphoideus titanus Vector
2022
One of the most destructive diseases affecting grapevine in Europe is caused by Flavescence Dorée phytoplasma (FDp), which belongs to the 16Sr-V group and is a European Union quarantine pathogen. Although many molecular techniques such as loop-mediated isothermal amplification (LAMP) are widely used for the rapid detection of FDp in infected grapevine plants, there is no developed isothermal amplification assay for FDp detection in the insect vectors that are fundamental for the spread of the disease. For this reason, a simple in-field real-time LAMP protocol was optimized and developed for the specific detection of FDp in the insect vector Scaphoideus titanus. The LAMP assay was optimized …