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| · Effect of two surfactants on in vitro permeation of butorphanol through horse nasal mucosa Velloso, María Inés; Andreetta, Héctor Alfredo; Landoni, María Fabiana
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| · Optimization of larval culture for the production of juvenile spotted snapper Lutjanus guttatus in Costa Rica Chacón-Guzmán, Jonathan; Carvajal-Oses, Milagro; Herrera-Ulloa, Ángel
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| · Multitemporal analysis of plant associations and land use changes in a high Andean locality, Puno-Peru Loza-Del Carpio, Alfredo; Taype-Huamán, Irene
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| · Bacterial pathogens and their antimicrobial resistance in tilapia culture in Guatemala García-Pérez, Josué; García-Pérez, Josué; Ulloa-Rojas, Juan B.; Mendoza-Elvira, Susana
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| · Preliminary inventory of atmospheric emissions (SO2, NOx and TSP) from different industrial sectors in Costa Rica Alfaro-Alfaro, Daniel; Salas-Morelli, Luis; Sánchez-Mejías, Bryan; Mora-Barrantes, José; Sibaja-Brenes, José Pablo; Borbón-Alpízar, Henry
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| · Changes in land cover in coastal erosion hotspots in the southern Caribbean of Costa Rica during the period 2005-2017 Sandoval-Murillo, Luis; Barrantes-Castillo, Gustavo
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| · Efecto de un difusor tipo wind lens en flujo turbulento Richmond-Navarro, Gustavo; Casanova-Treto, Pedro; Hernández-Castro, Franklin
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| · An approach to didactic-mathematical knowledge of future Basic Education teachers to teach elementary mathematics Pincheira, Nataly; Vásquez, Claudia; Giacomone, Belen
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| · Comparing probabilities in urns: A study with primary school students Batanero, Carmen; Hernández-Solís, Luis Armando; Gea, María M.; Álvarez-Arroyo, Rocío
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| · Knowledge of preservice elementary teachers on fractions Castro-Rodríguez, Elena; Rico, Luis
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| · Pedagogical effectiveness in the school organizational culture and the professional learning community Mendoza Velazco, Derling José; Cejas Martínez, Magda Francisca; Cejas Martínez, Magda Francisca; Navarro Cejas, Mercedes; Flores Hinostroza, Elizeth Mayrene; Castillo Pinos, Karina Maribel
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| · Competencies of pre-service mathematics teachers when transforming the representations of a function De Armas, Tulio Amaya; Castellanos, Arjuna Gabriel; Pino-Fan, Luis Roberto
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| · Nesting of arboreal ants (Hymenoptera: Formicidae) in artificial substrates in coffee plantations in the Colombian Andes López-Dávila, Andrés Jireh; Escobar-Ramírez, Selene; Armbrecht, Inge
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| · Origin of color variations of thin, nano-sized layers of volcanic cinder from the Sierra Negra Volcano of the Galapagos Islands Debut, Alexis; Toulkeridis, Theofilos; Vaca, Andrea V.; Arroyo, Carlos R.
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| · Workload in a group of Latin American teachers during the COVID-19 pandemic Medina-Guillen, Leonardo Flavio; Quintanilla-Ferrufino, Gustavo Jared; Palma-Vallejo, Margarita; Medina Guillen, Mónica Fernanda
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| · Structures in direct and inverse forms of a function evidenced by 7-8-year-old students Torres, María D.; Cañadas, María C.; Moreno, Antonio; Gómez, Pedro
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| · Argument schemes of high school students when using GeoGebra in the context of tessellations Morales Ramírez, Guadalupe; Larios Osorio, Víctor; Rubio Goycochea, Norma
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| · Analysis of definitions of limit provided by University students González-Flores, Yosenith; Montoro-Medina, Ana Belén; Ruiz-Hidalgo, Juan Francisco
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| · Suitability criteria used by future primary school teachers in the assessment of math educational videos Burgos Navarro, María; Castillo Céspedes, María José
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| · Socio-environmental aspects affecting water contamination in an urban area Sánchez-Gutiérrez, Rolando; Alfaro-Chinchilla, Carolina; Ledezma-Zamora, Kimberly; Hernando-Echeverría, Ligia; Mora-Aparicio, Carmen; Pérez-Salazar, Roy
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| · Norms that regulate the management of virtual mathematics classes in the COVID-19 context Peña, Cristina N.; Pino-Fan, Luis R.; Assis, Adriana
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