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         oceanic crust (CORTEZA OCEANICA)
         oceanography (OCEANOGRAFIA)
         oceans (OCEANOS)
         octane (OCTANO)
         octane number (NUMERO OCTANO)
         octanoic acid (ACIDO OCTANOICO)
         octanols (OCTANOLES)
         octenes (OCTANOS)
         octet model (MODELO DEL OCTETO)
         octupole radiation (RADIACION OCTOPOLAR)
         octupoles (OCTOPOLOS)
         octyl alcohols (ALCOHOLES OCTILICOS)
         odd-even nuclei (NUCLEOS IMPAR-PAR)
         odd-odd nuclei (NUCLEOS IMPAR-IMPAR)
         odocoileus (ODOCOILECOS)
         odor (OLOR)
         odorants (OLORANTES)
         odorization (OLORIZACION)
         oecd (OCDE)
         oer (OER)
         office buildings (EDIFICIOS DE OFICINAS)
         office furniture (MOBILIARIO DE OFICINAS)
         office of technology assessment (OFICINA SEGUIMIENTO TECNOLOGICO)
         offshore drilling (SONDEO MARINO)
         offshore operations (OPERACIONES COSTERAS)



         oils (ACEITES)
         ointments (POMADAS)
         okinawa (OKINAWA)
         oklahoma (OKLAHOMA)
         olefins (OLEFINAS)
         oleic acid (ACIDO OLEICO)
         olein (OLEINA)
         oleoresins (OLEORESINAS)
         olfactory bulbs (BULBOS OLFATIVOS)
         oligonucleotides (OLIGONUCLEOTIDOS)
         oligosaccharides (OLIGOSACARIDOS)
         olive oil (ACEITE DE OLIVA)
         olive trees (OLIVOS)
         olives (ACEITUNAS)
         olivine (OLIVINA)
         oman (OMAN)
         omega baryons (BARIONES OMEGA)
         omega facility (INSTALACION OMEGA)
         omega particle beams (HACES DE HIPERONES-OMEGA)
         omega particles (HIPERONES OMEGA)
         omentum (EPIPLON)
         on-highway use (USO DENTRO-CARRETERA)
         on-line computers (ORDENADORES EN LINEA)
         on-line control systems (SISTEMAS DE CONTROL EN LINEA)
         on-line measurement systems (SISTEMAS DE MEDIDA EN LINEA)






         organic matter (MATERIA ORGANICA)
         organic mercury compounds (COMPUESTOS ORGANICOS DE MERCURIO)
         organic moderators (MODERADORES ORGANICOS)
         organic nitrogen compounds (COMPUESTOS ORGANICOS DE NITROGENO)
         organic oxygen compounds (COMPUESTOS ORGANICOS DE OXIGENO)
         organic phosphorus compounds (COMPUESTOS ORGANICOS DE FOSFORO)
         organic polymers (POLIMEROS ORGANICOS)
         organic semiconductors (SEMICONDUCTORES ORGANICOS)
         organic silicon compounds (COMPUESTOS ORGANICOS DE SILICIO)
         organic solar cells (CELULAS SOLARES ORGANICAS)
         organic solvents (DISOLVENTES ORGANICOS)
         organic sulfur compounds (COMPUESTOS ORGANICOS DE AZUFRE)
         organic superconductors (SUPERCONDUCTORES ORGANICOS)
         organic wastes (REIDUOS ORGANICOS)
         organization economic co-operation and development (ORGANIZACION COOPERACION Y DESARROLLO ECONOMICO)
         organization of american states (ORGANIZACIÓN ESTADO AMERICANOS)
         organizational models (MODELOS DE ORGANIZACION)
         organizing (ORGANIZACION)
         organoleptic properties (PROPIEDADES ORGANOLEPTICAS)
         organometallic compounds (COMPUESTOS ORGANOMETALICOS)
         organs (ORGANOS)
         oriental americans (AMERICANOS ORIENTALES)
         orientation (ORIENTACION)
         orientation grain
         oriented nuclei (NUCLEOS ORIENTADOS)


         orifices (ORIFICIOS)
         origin (ORIGEN)
         ornamental plants (PLANTAS ORNAMENTALES)
         ornithine (ORNITINA)
         ornl (ORNL)
         orogenesis (OROGENESIS)
         orotic acid (ACIDO OROTICO)
         orthoclase (ORTOCLASE)
         orthogonal transformations (TRANSFORMACIONES ORTOGONALES)
         orthoptera (ORTOPTEROS)
         orthorhombic lattices (REDES ORTORROMBICAS)
         oryza (ORIZA)
         oscillation modes (MODOS DE OSCILACION)
         oscillations (OSCILACIONES)
         oscillations plasma
         oscillator strengths (INTENSIDADES DEL OSCILADOR)
         oscillators (OSCILADORES)
         oscillators reactor
         osha (OSHA)
         osmium (OSMIO)
         osmium 169 (OSMIO 169)
         osmium additions (ADICIONES DE OSMIO)
         osmium chlorides (CLORUROS DE OSMIO)
         osmium complexes (COMPLEJOS DE OSMIO)
         osmium compounds (COMPUESTOS DE OSMIO)


         osmium ions (IONES OSMIO)
         osmium oxides (OXIDOS DE OSMIO)
         osmium sulfides (SULFUROS DE OSMIO)
         osmosis (OSMOSIS)
         osteoblasts (OSTEOBLASTOS)
         osteocytes (OSTEOCITOS)
         osteomyelitis (OSTEOMELITIS)
         osteoporosis (OSTEOPOROSIS)
         osteoradionecrosis (OSTEORADIONECROSIS)
         osteosarcomas (OSTEOSARCOMAS)
         other organic compounds (OTROS COMPUESTOS ORGANICOS)
         ottawa river (RIO OTTAWA)
         otters (NUTRIAS)
         otto cycle (CICLO CICLO)
         otto process (PROCESO OTTO)
         ouabain (OUABAINA)
         outages (CORTES DE ELECTRICIDAD)
         outdoors (EXTERIORES)
         outer continental shelf (ANAQUEL CONTINENTAL SALIDA)
         outlet structures (ESTRUCTURAS DE SALIDA)
         output (RENDIMIENTO)
         ova (OVA)
         ovalbumin (OVOALBUMINA)
         ovaries (OVARIOS)
         oven coke (CARBON HORNO)


         ovens (HORNOS)
         overburden (MATERIAL DE RECUBRIMIENTO)
         overcurrent (SOBRECORRIENTE)
         overhead power transmission (TRANSMISION DE POTENCIA ELEVADA)
         overthrust belt (OVERTHRUST BELT)
         ovulation (OVULACION)
         ownership (PROPIEDAD)
         oxadiazoles (OXADIAZOLES)
         oxalates (OXALATOS)
         oxalic acid (ACIDO OXALICO)
         oxalic acid esters (ESTERES DEL ACIDO OXALICO)
         oxazoles (OXAZOLES)
         oxetane (OXETANO)
         oxidants (OXIDANTES)
         oxidases (OXIDASAS)
         oxidation (OXIDACION)
         oxidation state (ESTADO OXIDACION)
         oxide minerals (MINERALES DE OXIDO)
         oxides (OXIDOS)
         oxidizers (CUERPOS OXIDANTES)
         oxidizing agents (AGENTES DE OXIDACION)
         oxidoreductases (OXIDORREDUCTASAS)
         oximes (OXIMAS)
         oxine (OXINA)
         oxirans (OXIRANOS)