2002, Number 4

Contents

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Enterobius vermicularis infection in preschool children from Ciudad Bolívar, Venezuela

Requena-Certad, Ixora; Vishna Lizardi; Luz Mery Mejía; Héctor Castillo; Rodolfo Devera

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Comparative studio of three filters papers in neonatal screening UMELISA assays for phenylketonuria and congenital hypothyroidism

Amarilys Frómeta-Suárez; Neivis Marrero-González; Ernesto González-Reyes; Elena Lugo-Vallejo; Lianny Fernández-Fernández; Marina B Doménech-Mylnikova

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A study of the dielectric dissapation factor as a diagnostic tool

Wilfredo Fariñas-Coronado; Zenaida Paz; Gregorio J Orta; Ernesto Rodrìguez-Denis

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Knowledge, behavior and seroprevalence towards HIV infection among female sex workers in Yucatan, Mexico

Renán A Góngora-Biachi; Pavía-Ruz, Norma; Vera-Gamboa, Ligia; Pedro González-Martínez; Javier Flores-Abuxapqui; William Moguel-Rodríguez; Dora Lara-Perera; Gabriela Alonso-Salomón

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Response of Brahman heifers to estrus synchronization with progestagens, sexual behavior and pregnancy rate

Carlos Silva-Mena; Roberto Guzmán-Casas; Roger Delgado-León; Aké-López, Ricardo

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Isolation of Escherichia coli O157:H7 from Costa Rican food

Alejandra Reuben; Hellen Treminio; María L Arias; Laura Villalobos

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Radioimmunoassay data handling

Jorge H Alvarez-Cervera

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Megadrought and Megadeath in 16th Century Mexico

Rodolfo Acuna-Soto; David W Stahle; Malcolm K Cleaveland; Matthew D Therrell

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Breve consideración sobre la clonación de seres humanos

Jesús Quintanilla-Osorio