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Now showing items 12838-12857 of 13578
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The lipopolysaccharide core of Brucella abortus acts as a shield against innate immunity recognition
(PLoS Pathogens, 2012-05-10)Innate immunity recognizes bacterial molecules bearing pathogen-associated molecular patterns to launch inflammatory responses leading to the activation of adaptive immunity. However, the lipopolysaccharide (LPS) of the ... -
The magnetic dispersion
(Editorial de la Universidad Nacional, 1985-01-01)We present a study of the elastic scattering of an electron in a constant homogeneous magnetic field. The dependency of the cross section on the electron spin orientation is given. If the spin polarization is along or ... -
The manufacture and properties of oil palm and pineapple leaf fiberboard panels
(WIT Transactions on Ecology and the Environment, 2014)Particleboards were manufactured from oil palm fruit, the oil palm mesocarp fiber of Elaeis guineensis, the leaves of pineapple (Ananas comosus) and the sawdust from three fast-growing species of trees (Gmelina arborea, ... -
The March 25, 1990 (Mw=7.0, ML=6.8), earthquake at the entrance of the Nicoya Gulf, Costa Rica: Its prior activity, foreshocks, aftershocks, and triggered seismicity
(American Geophysical Union, 1995-10-10)On March 25, 1990 a large earthquake (Mw = 7.0, ML = 6.8) occurred at the entrance of the Nicoya Gulf, Costa Rica, at 1322:55.6 UTC, producing considerable damage in central Costa Rica and generating much interest about ... -
“The Meadow: producción de un cuento infantil en inglés para discentes de primaria de edades entre 6 y 9 años como recurso didáctico para el aprendizaje de una segunda lengua”
(Universidad Nacional, Costa Rica, 2022-02)La investigación propone preparar y capacitar a los docentes desde los inicios de su proceso de formación para que cuenten con las estrategias y herramientas esenciales que logren enseñar a las nuevas generaciones brindando ... -
The mixed-proficiency language class in the associate's program in English at UNASRB: the consequences for students, teachers and the institution.
(Escuela de Literatura y Ciencias del Lenguaje. Maestría en Segundas Lenguas y Culturas, 2011)Este estudio de caso se llevo a cabo con estudiantes de ingles como lengua extranjera del programa de Diplomado en Ingles de la Universidad Nacional Sede Regional Brunca. El propósito de esta investigación era investigar ... -
The mixed-proficiency language class: consequences for students, professors and the institution
(Editorial Universidad Nacional, 2013-02-19)Se examinan los efectos de reunir estudiantes con varios niveles lingüísticos en una sola clase de inglés como lengua extranjera y sus efectos en la participación, progreso, retención y el desarrollo de la clase en el ... -
The Mw 6.4 Damas, Costa Rica, Earthquake of 20 November 2004: Aftershocks and Slip Distribution
(Seismological Society of America, 2006-08)The earthquake of 20 November 2004 was located north of Damas Island in the Pacific coast of Costa Rica, within the Costa Rica Deformed Belt. The earthquake was located at 24 km depth and reported with a magnitude (Mw) of ... -
The myth of native speakers and native speakerism in Costa Rica
(Universidad Nacional, Costa Rica, 2021)Speaking English has become the universal language which people use to communicate, nonetheless to what extent do second language learners should master English to the point of having “Native” like mastery. This essay ... -
The Nicoya segment of Middle American Trench: an Excellent Target for Drilling and Monitoring the Shallow Portion of the Seismogenic Zone
(2011-06-28)The Nicoya segment of Middle America Trench has generated large earthquakes in 1883, 1900 and 1950. Since the Nicoya peninsula sits right over the seismogenic zone, it has proved to be a unique site for near field monitoring ... -
The NS segment of H5N1 avian influenza viruses (AIV) enhances the virulence of an H7N1 AIV in chickens
(Veterinary Research, 2014-01-25)Some outbreaks involving highly pathogenic avian influenza viruses (HPAIV) of subtypes H5 and H7 were caused by avian-to-human transmissions. In nature, different influenza A viruses can reassort leading to new viruses ... -
The one hundred year journey of the genus Brucella (Mayer and Shaw 1920)
(Oxford University Press, 2021-01-01)The genus Brucella, described by Meyer and Shaw in 1920, comprises bacterial pathogens of veterinary and public health relevance. For 36 years, the genus came to include three species that caused brucellosis in livestock ... -
The opening of vents like decompression valves of the hydrothermal system at Turrialba volcano, Costa Rica
(International Association of Volcanology and Chemistry of the Earth's Interior, 2013-07-24) -
The opossum and other didelphids in the cultures of Costa Rican society and indigenous peoples: an approach to ecology and conservation
(Cold Spring Harbor Laboratory (Estados Unidos), 2024)The opossum Didelphis marsupialis, commonly referred to as the zorro pelón in Costa Rica, is a marsupial that holds significant representation in both Costa Rican and indigenous cultures, such as the Talamanca natives. ... -
The persistent embrace of onychophorans: What determines copulation duration in velvet worms?
(Universidad de Costa Rica (Costa Rica), 2019)In the only onychophorans mating that has been photographed, instead of fleeing, the couple remained together despite being manipulated. Why? The duration of copulation in onychophoran sis possibly controlled by the female, ... -
The pertinence of addressing the affective filter in EFL Costa Rican classrooms and strategies to lower it
(Universidad Nacional, Costa Rica, 2022)This paper explains the relevance that the affective filter has on students’ learning processes and the different approaches that can be implemented to reduce its negative effects. At this time, several studies have confirmed ... -
The polynucleotide kinase 3′-phosphatase gene (PNKP) is involved in Charcot-Marie-Tooth disease (CMT2B2) previously related to MED25
(Springer, 2018-07-24)Charcot-Marie-Tooth disease (CMT) represents a heterogeneous group of hereditary peripheral neuropathies. We previously reported a CMT locus on chromosome 19q13.3 segregating with the disease in a large Costa Rican family ... -
The potential use of Rattus norvegicus (Mammalia, Muridae) in experimental infections with metacercariae of Paragonimus mexicanus (Digenea, Troglotematidae)
(Universidad Nacional, Costa Rica, 2017-01-15)Seven Wistar rats (Rattus norvegicus) were experimentally infected with Paragonimus mexicanus metacercariae, obtained from organs and tissues of freshwater crabs (Brachyura: Pseudothelphusidae) collected from the Caribbean ... -
The principles of cooperative learning in an oral communication course in English: A descriptive analysis
(Universidad Nacional, 2014)This article reports on the findings of a research conducted to describe the occurrence and effect of the principles of Cooperative Learning in an oral communication course in English for sophomores during one semester at ... -
The promotion of online student-centered classes to achieve Communicative Language Teaching with the help offered by technological tools
(Universidad Nacional, Costa Rica, 2021)Nowadays, teaching virtually has become a challenge due to the COVID 19 emergency. However, with the help of technological tools, English as aforeign language (EFL) classes can be directed towards a student-centered ...