Method for determination of the insecticide amitraz residual content in honey has been developed and validated. The method is selective, express easy-to-perform. technique based on extraction from alkalized aqueous solutions with n-hexane quantitative by high-performance liquid chromatography mass spectrometric detection. Validation was performed using three types at levels application 6, 120 2...

ABSTRACT In the late 1970s, we discovered that toxic bicyclic phosphates inhibit generation of miniature inhibitory junction potentials, implying their antagonism ?-aminobutyric acid (GABA) receptors (GABARs; GABA-gated chloride channels). This unique mode action provided a strong incentive for our research on GABARs in later years. Furthermore, minor structural changes conferred insect GABAR s...

Introducción: En Costa Rica se procesan anualmente 681 millones de litros leche, debido al alto consumo per cápita que es 216 kilogramos, por lo particularmente importante evitar los efectos tóxicos la leche contaminada, asociados a vómitos, parálisis y calambres, y, largo plazo, cáncer, trastornos endocrinos, diabetes alteraciones cromosómicas, entre otros. Objetivo: Determinar niveles residuo...