title: Mexican and U.S. scientists: Partners.
authors.affiliation: The National College and Faculty of Science, National Autonomous University of Mexico (UNAM), Mexico City, Mexico. alar@ciencias.unam.mx.
authors.forename: Antonio
authors.initials: A
authors.lastname: Lazcano
authors.affiliation: Center of Sociological Studies, Faculty of Political and Social Sciences, UNAM, Mexico City, Mexico.
authors.forename: Adriana Ortiz
authors.initials: AO
authors.lastname: Ortega
authors.affiliation: Biblioteca Conjunta de Ciencias de la Tierra, UNAM, Mexico City, Mexico.
authors.forename: Saúl
authors.initials: S
authors.lastname: Armendariz