Search results for "SOUTH AMERICA"
showing 10 items of 98 documents
Characterisation of Lymnaea cubensis, L. viatrix and L. neotropica n. sp., the main vectors of Fasciola hepatica in Latin America, by analysis of the…
2007
Although, in the endemic areas throughout the world, human fascioliasis presents varying patterns in its epidemiology, the species of lymnaeid snail that act as intermediate hosts and vectors are always crucial in the transmission of the causative parasites. Species in the Galba/Fossaria group of snails, such as Lymnaea cubensis, L. viatrix var. A ventricosa, L. viatrix var. B elongata and Galba truncatula, appear to be frequently involved in the transmission of Fasciola hepatica in Central and South America, although specific classification within this morphologically and anatomically confusing group is often very difficult. To explore the potential use of molecular analyses in the identif…
High-resolution records of growth temperature and life history of two Nacella limpet species, Tierra del Fuego, Argentina
2020
Stable isotope ratios in patelloid limpets of the genus Patella have been established as proxies for coastal environmental change at sub-monthly resolution along the eastern North Atlantic and Mediterranean Sea. Nacella deaurata (Gmelin, 1791) and N. magellanica (Gmelin, 1791) are common intertidal species of patelloid limpets inhabiting the coast of Tierra del Fuego, Argentina/Chile and are commonly found in Holocene archaeological deposits. Here, we examine oxygen and carbon isotope ratios (δ18Oshell and δ13Cshell, respectively) of modern specimens of N. deaurata and N. magellanica to test the hypotheses that: 1) they form their shells in isotopic equilibrium with ambient water; and 2) pr…
The Castniidae (Lepidoptera) in the collection of the Natural History Museum of the Institute of Systematics and Evolution of Animals of the Polish A…
2017
Praca zawiera informacje na temat przedstawicieli rodziny Castniidae znajdujących się w zbiorach Muzeum Przyrodniczego Instytutu Systematyki i Ewolucji Zwierząt Polskiej Akademii Nauk w Krakowie. Łącznie w kolekcji odnaleziono 17 okazów należących do 14 gatunków i podgatunków tej rodziny. Dla każdego z tych taksonów przedstawiono uwagi na temat rozmieszczenia oraz biologii.
A multicenter observational study on the role of comorbidities in the recurrent episodes of benign paroxysmal positional vertigo
2014
Objective: Primary objective of this study was to find a statistical link between the most worldwide comorbidities affecting the elderly population (hypertension, diabetes, osteoarthrosis, osteoporosis and depression) and recurrent episodes of BPPV. Secondary objective was defining possible "groups of risk" for people suffering recurrent positional vertigo related to the presence of a well documented comorbidity. Methods: This was an observational, cross-sectional, multicenter, spontaneous, non-pharmacological study. The data of 1092 patients suffering BPPV evaluated in 11 different Departments of Otolaryngology, Otoneurology and Neurology, referring Centers for positional vertigo evaluatio…
La desigualdad económica regional en América Latina (1895-2010)
2020
En este artículo se analiza por primera vez el crecimiento y la evolución de la desigualdad regional a lo largo del proceso de desarrollo económico de nueve países de Latinoamérica (Argentina, Bolivia, Brasil, Chile, Colombia, México, Perú, Uruguay y Venezuela) entre 1895 y 2010. Para ello, en primer lugar se verifica la presencia de un proceso de beta-convergencia entre los países latinoamericanos para la totalidad del periodo. No obstante, se muestra cómo este proceso fue especialmente intenso durante los periodos en los que los diferentes Estados implementaron políticas activas de desarrollo (ISI) que favorecieron la convergencia entre las regiones de un mismo país. En segundo lugar, se …
Ancient proteins resolve the evolutionary history of Darwin's South American ungulates.
2015
No large group of recently extinct placental mammals remains as evolutionarily cryptic as the approximately 280 genera grouped as 'South American native ungulates'. To Charles Darwin, who first collected their remains, they included perhaps the 'strangest animal[s] ever discovered'. Today, much like 180 years ago, it is no clearer whether they had one origin or several, arose before or after the Cretaceous/Palaeogene transition 66.2 million years ago, or are more likely to belong with the elephants and sirenians of superorder Afrotheria than with the euungulates (cattle, horses, and allies) of superorder Laurasiatheria. Morphology-based analyses have proved unconvincing because convergences…
Scientific production in clinical medicine and international collaboration networks in South American countries
2012
Background: International collaboration is increasingly used in biomedical research. Aim: To describe the characteristics of scientific production in Latin America and the main international collaboration networks for the period 2000 to 2009. Material and Methods: Search for papers generated in Latin American countries in the Clinical Medicine database of ISI Web of Knowledge v.4.10 - Current Contents Connect. The country of origin of the corresponding author was considered the producing country of the paper. International collaboration was analyzed calculating the number of countries that contributed to the generation of a particular paper. Collaboration networks were graphed to determine …
A retrospective international study on factors associated with injury, discomfort and pain perception among cyclists
2019
International audience; Although cycling has been associated with overuse/fatigue and acute injuries, there is lack of information regarding associated risk factors and prevention factors. The objective of the study was to determine the factors associated with injury, and perceptions of discomfort and pain in cyclists. A total of 739 cyclists completed an online questionnaire between February and October 2016. The questionnaire acquired information on participant demographics, characteristics related to cycling profile and fitness training, bike components and cycling posture, self-reported perceptions of comfort and pain, and injuries sustained in the last 12 months. Logistic regression mo…
Home-based HIV testing: Using different strategies among transgender women in Argentina.
2019
Background In Argentina, HIV prevalence among transgender women (TGW) has been reported at 34%. The stigma is one of the most important factors limiting their access to healthcare services. The aims of this study were to compare different HIV testing methodologies, to determine the factors associated with HIV diagnosis and to determine the feasibility of a home-based HIV testing service for TGW. Methods A multidisciplinary team performed home-based HIV testing interventions in four cities of Argentina. Participants self-identified as TGW, older than 14 years and with a negative or unknown HIV status. Blood samples were screened by two rapid tests (RT), one based on antibodies (Determine™ HI…
La colaboración científica en el campo de las ciencias de la actividad física y el deporte en España
2010
Este estudio examina la colaboración científica a través de los patrones de coautoría en una muestra de revistas españolas de Ciencias de la Actividad Física y el Deporte (CCAFD). También analiza los principales grupos de investigación y disciplinas del campo multidisciplinar de las CCAFD. Se analizaron la frecuencia y porcentaje de los artículos en colaboración y el número de autores por artículo. Se revisaron las redes de colaboración de los autores más productivos para identificar grupos de investigación y se calculó la densidad para conocer su cohesión. La producción científica fue analizada también por disciplinas. Los artículos en colaboración superan a los artículos de autor único en…