Costa Rica (1) Labor (1) Women chemists (1) Water (1) Time (1) Sewage--Purification (1) Sewage (1) Refuse and refuse disposal (1) Pollutants (1) Organic compounds (1) Microorganisms (1) Magnesium (1) Laboratories (1) Gas chromatography (1) Fungi (1) Chromatographic analysis (1) Chemists (1) Chemistry (1) Bacteria (1) Ability (1) Contaminantes (1) Daphnia (1) Químicos (1) Experimentos (1) Residuos (1) Compuestos orgánicos (1) Magnesio (1) Cromatografía de gases (1) Laboratorios (1) Cromatografía (1)