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Mostrando ítems 114-133 de 360
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Ecotoxicological analysis during the removal of carbofuran in fungal bioaugmented matrices
(2016-02)Biomixtures are used for the removal of pesticides from agricultural wastewater. As biomixtures employ high content of lignocellulosic substrates, their bioaugmentation with ligninolytic fungi represents a novel approach ... -
Effect on cell growth, viability and migration of geraniol and geraniol-containing essential oil from Lippia alba (Verbenaceae) on gastric carcinoma cells
(2021)Natural products used to treat cancer, or as leads for the development of preventive and co-adjuvant treatment strategies, are still a current approach. We studied the effect of essential oils from the medicinal plant ... -
Efficient syntheses of streptocarpone and (±)-a-dunnione
(2007)An efficient divergent synthesis of both streptocarpone and racemic α-dunnione from lawsone are described. A one-pot, formal [3+2] cyclization to form a furanonaphthoquinone directly provided a common intermediate. -
Elaboración de un lubricante potencialmente biodegradable de uso industrial a partir de quitosano, aceite de ricino y aditivos antioxidantes de origen natural
(2023-09-07)En la actualidad, la tecnología de los lubricantes se enfoca hacia la protección del medio ambiente. Sin embargo, la mayoría de los actuales lubricantes de uso industrial están conformados por aceites minerales como matriz ... -
Electrochemical biosensor for quantitative determination of fentanyl based on immobilized cytochrome c on multi-walled carbon nanotubes modified screen-printed carbon electrodes
(2022)Fentanyl is a powerful synthetic opioid used to treat severe pain. New administration routes toward its illegal consumption for recreational purposes pose a growing threat to public health, either due to misuse or abuse ... -
Electrochemical determination of novel psychoactive substances by differential pulse voltammetry using a microcell for boron-doped diamond electrode and screen-printed electrodes based on carbon and platinum
(2021)25B-NBOMe, benzylpiperazine (BZP), 1-(3-chlorophenyl)piperazine (mCPP), and N,N-dimethyltryptamine (DMT) are potent hallucinogenic and stimulant drugs which have emerged as novel psychoactive substances (NPS). The ... -
Empleo de técnicas y materiales biológicos en la búsqueda de productos activos contra la malaria
(2001)Se describen los métodos empleados en el estudio del efecto de extractos de insectos preparados en el Instituto Nacional de Biodiversidad de Costa Rica, sobre un tipo de malaria murina producida por el Plasmodium bergheim. ... -
Ent-clerodane derivatives and other constituents from representatives of the subgenus ageratina
(1989)Ageratina ixiocladon afforded several p-hydroxyacetophenone derivatives and diterpenes including six new ent-clerodanes. Two further species, which are also placed in the subgenus Ageratina, gave p-hydroxyacetophenone ... -
Ent-clerodane derivatives from chromolaena connivens
(1989)The aerial parts of Chromolaena connivens afforded in addition to widespread compounds four ent-clerodane derivatives and two epimeric prostaglandin-like acids. A second species, C. turnariensis, only gave widespread ... -
Environmental Chemistry Group and Environmental Mineralogy Group Hold First Joint Meeting
(2018-08-01)Este blog describe las actividades académicas de los integrantes del Geomicro Group de la University of Manchester, Reino Unido, liderado por el Prof. Jonathan Lloyd. Esta publicación en particular, fue escrita por Agustín ... -
Espectro de Masas de Algunos Derivados del 9,10-Dihidrofenantreno
(1978)Discussion of the mechanisms of mass spectra fragmentation of some derivatives of 9,10-dihidrofenantreno -
Essential oil from leaves of Myrcianthes fragrans (Myrtaceae) from Costa Rica. A new chemotype?
(2017)Myrcianthes is a Myrtaceous genus of flowering plants of about 30 to 40 species, distributed in the American continent. The aim of this work was to study the chemical composition of the foliar essential oil from M. fragrans ... -
Essential oils of Baccharis trinervis (Asteraceae) from Costa Rica
(2017)Baccharis is an Asteraceae genus of flowering plants, which has about 340 to 400 species, ranging from the Southern United States to the Southern extreme of Argentina and Chile through Central America and the Caribbean ... -
Esteres mixtos derivados del trans-9,10-dihidroxi-9,10-dihidrofenantreno
(1982)Synthesis, structure elucidation, steric effects, and spectrometric analysis of some mixed esters of trans-9,10-dihydroxy-9,10-dihydrophenanthrene are discussed. The quasi-axial conformation of the two ester groups, in ... -
Estrogenic and serotonergic butenolides from the leaves of Piper hispidum Swingle (Piperaceae)
(Journal of Ethnopharmacology 129(2): 220–226, 2010)Ethnopharmacological relevance: Our previous work has demonstrated that several plants in the Piperaceae family are commonly used by the Q’eqchi Maya of Livingston, Guatemala to treat amenorrhea, dysmenorrhea, and pain. ... -
La estructura de la Diacetonafenantrenoquinona
(1971)The substance, diacetonephenanthrenequinone, long believed to have structure I or II, is found to have structure IV according to modern spectroscopic methods and chemical behavior. -
Estructura y Configuración de la Diacetona-Fenantrenoquinona
(1981)Estudio de la estructura y configuración molecular de la diacetona-fenantrenoquinona por difracción de rayos X y espectrometría de masas -
Estudio de aditivos anticorrosivos para las aleaciones comerciales de la batería alcalina alumino-aire
(2020)La sociedad actual está avanzando hacia un modelo energético más responsable y sostenible. La punta de lanza de esta necesaria tendencia es el uso de fuentes de energía renovables y la reducción de las emisiones de CO2 ...