996 resultados para Toxicity vs salinity
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El artículo forma parte de una sección de la revista dedicada a innovación educativa
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Este artículo pertenece a una sección de la revista dedicada a psicología y creatividad
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Resumen basado en el de la publicación
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Resumen basado en el de la publicación. Artículo originalmente presentado como ponencia en el III Congreso Virtual de AIDIPE
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Monográfico con el título: 'Aprender a convivir'. Resumen basado en el de la publicación
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Resumen tomado de la publicación
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Resumen basado en el de la publicaci??n
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Resumen basado en el de la publicaci??n
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Resumen basado en el de la publicaci??n
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Incluye ap??ndice
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Mediterranean salt marshes are ecosystems that are highly influenced by sea changes and freshwater inputs from runoff. In these ecosystems, toxic and non-toxic algae blooms often produce large and unpredictable biomasses of phytoplankton. The Microtox R test has been described as a successful, quick method for detecting toxicity in various phytoplankton taxa. Ourstudy sought to test the efficiency of Microtox R in detecting toxic HAB in Mediterranean salt marshes. The results showed that the Microtox R test was able to detect toxic substances in the particulate matter of several lagoons in the Empordà salt marshes. This Microtox R toxicity coincided with periods when potentially harmful cyanobacteria, dinoflagellates and haptophytes had a high biomass. The results suggest that potentially harmful phytoplankton cannot be ruled out as a source of Microtox R
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La acción innovadora desarrollada por la Unidad de Innovación Educativa de la Universitat de València oscila entre dos ejes: por un lado, el fomento de la innovación educativa a partir de las convocatorias anuales de innovación educativa en el profesorado (programas DocenTIC, Finestra Oberta, DocInvest y OCW, en la actualidad) y en el alumnado (programa ESTIC). Por otro lado, la UdIE actúa dando apoyo técnico, logístico y administrativo a la comunidad universitaria. Se pretende evaluar las distintas herramientas empleadas a lo largo del tiempo, haciendo un análisis más detallado del papel del estudiante en dicho proceso. Finalmente se presentarán las conclusiones de estas experiencias y se valorará su transferibilidad a otros ámbitos
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Among increasingly used pharmaceutical products, β-blockers have been commonly reported at low concentrations in rivers and littoral waters of Europe and North America. Little is known about the toxicity of these chemicals in freshwater ecosystems while their presence may lead to chronic pollution. Hence, in this study the acute toxicity of 3 β-blockers: metoprolol, propranolol and atenolol on fluvial biofilms was assessed by using several biomarkers. Some were indicative of potential alterations in biofilm algae (photosynthetic efficiency), and others in biofilm bacteria (peptidase activity, bacterial mortality). Propranolol was the most toxic β-blocker, mostly affecting the algal photosynthetic process. The exposure to 531 μg/L of propranolol caused 85% of inhibition of photosynthesis after 24 h. Metoprolol was particularly toxic for bacteria. Though estimated No-Effect Concentrations (NEC) were similar to environmental concentrations, higher concentrations of the toxic (503 μg/L metoprolol) caused an increase of 50% in bacterial mortality. Atenolol was the least toxic of the three tested β-blockers. Effects superior to 50% were only observed at very high concentration (707 mg/L). Higher toxicity of metoprolol and propranolol might be due to better absorption within biofilms of these two chemicals. Since β-blockers are mainly found in mixtures in rivers, their differential toxicity could have potential relevant consequences on the interactions between algae and bacteria within river biofilms
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(INFINITIVE + CLITIC + AUX) is an evidential configuration in Old Spanish and Old Catalan, whereas (PARTICIPLE + CLITIC + AUX) is an instance of weak or unmarked focus fronting. The evidentiality of mesoclitic structures can be put forward on the bases of three main arguments: a) mesoclisis is not compulsory (i.e., whenever you have a clitic, you can either have mesoclisis or proclisis/enclisis); b) mesoclitic futures and conditionals are attested in interrogative sentences (with wh- elements); and c) they are not found in derived adverbial clauses (which is what you expect if they have an evidential value, since they bring about intervention effects corresponding to the derivational account of conditional and temporal sentences, for example - see Haegeman 2007 and ff.), and are related to high modal expressions (thus interfering with MoodPIrrealis)