21 research outputs found

    Ecophysiological and molecular involvement of extracellular-regulated protein kinases (ERK 1/2) in the response of Dunaliella viridis to heat stress

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    The eukaryotic green microalga Dunaliella viridis has shown an outstanding capacity to face a broad range of environmental stressors such as, high irradiance, UV radiation, salinity, and temperature, among others. The lack of a rigid cell wall, as well as, its unique ability to respond, adapt and grow under stressful conditions makes Dunaliella an excellent model to study stress signal transduction in eukaryotic unicellular organisms. Mitogen-activated protein kinases (MAPKs) are highly conserved serine/threonine kinases that convert extracellular stimuli into a wide variety of responses at both cellular and nuclear levels. In eukaryotic cells, MAPKs are involved in both environmental stress responses (JNK and p38 pathways) and cell proliferation and differentiation (ERK pathway) through protein kinase cascades. Previously, two different ERK proteins, ERK1 and ERK2 (ERK1/2) have been identified in D. viridis. Based on the non-direct implication of the ERK-like proteins in the acclimatization process against environmental stress proven by the specific blockade of the cascades, different short-term heat-shock (SH) experiments have been conducted in this work to uncover molecular mechanisms underlying the role of ERK1/2 in heat stress. The evolution of the maximum quantum yield of D. viridis after non-lethal SH, together with protein immunedetection by ERK1/2 western blotting and qRT-PCR experiments revealed that the ERK1/2 proteins are not directly involved in the response to heat stress, and that they are rapidly deactivated after stress, leading to a transient inhibition of cell division. Behaviour of MAPK-like proteins in algae is largely unknown at present. The analysis of their mechanism of action, as well as their function in this model microalga, will allow us to decipher the fate of unicellular eukaryotic organisms in aquatic ecosystems subjected to environmental stress derived from the conditions prevailing within a framework of global climate change.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

    TWEAK/Fn14 and non-canonical NF-kappaB signaling in kidney disease

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    The incidence of acute kidney injury (AKI) and chronic kidney disease (CKD) is increasing. However, there is no effective therapy for AKI and current approaches only slow down, but do not prevent progression of CKD. TWEAK is a TNF superfamily cytokine. A solid base of preclinical data suggests a role of therapies targeting the TWEAK or its receptor Fn14 in AKI and CKD. In particular TWEAK/Fn14 targeting may preserve renal function and decrease cell death, inflammation, proteinuria, and fibrosis in mouse animal models. Furthermore there is clinical evidence for a role of TWEAK in human kidney injury including increased tissue and/or urinary levels of TWEAK and parenchymal renal cell expression of the receptor Fn14. In this regard, clinical trials of TWEAK targeting are ongoing in lupus nephritis. Nuclear factor-kappa B (NF-κB) activation plays a key role in TWEAK-elicited inflammatory responses. Activation of the non-canonical NF-κB pathway is a critical difference between TWEAK and TNF. TWEAK activation of the non-canonical NF-κB pathways promotes inflammatory responses in tubular cells. However, there is an incomplete understanding of the role of non-canonical NF-κB activation in kidney disease and on its contribution to TWEAK actions in vivo.Grant support: ISCII and FEDER funds FIS PS09/00447, ISCIII-RETIC REDinREN/RD06/0016, RD12/0021, Comunidad de Madrid/CIFRA/S2010/BMD-2378. Salary support: FIS to MDSN, Programa Intensificación Actividad Investigadora (ISCIII/Agencia Laín-Entralgo/CM) to AO, FPU (Ministerio de Educación, Cultura y Deporte) to JP, Fundacion Conchita Rabago to LCT

    Ampliación del área de distribución de Oxyrhopus guibei Hoge & Romano, 1977 en Paraguay.

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    El género Oxyrhopus se encuentra representado en Paraguay por tres especies, O. guibei, O. petolarius y O. rhombifer. O. guibei es una serpiente terrestre de hábitos nocturnos de porte mediano de la familia Dipsadidae (Xenodontinae: Pseudoboini), conocida comúnmente como falsa coral por presentar coloración y patrones que varían entre negro, rojo y blanco, al igual que las serpientes del género Mi cruruso corales verdaderas.CONACYT - Consejo Nacional de Ciencia y TecnologíaPROCIENCI

    The importance of our environment: a qualitative study of water and soil in Iznalloz (Granada, Spain)

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    Proceedings of the I Congress PIIISA celebrado en la Estación Experimental del Zaidín (Granada), en mayo de 2013.-- Winning article of the II EEZ Science AwardUnderstanding and preserving our environment and spreading the information found about the richness of our cultural and natural background in Iznalloz (Granada, Spain) is essential for the development of our students. Therefore, by applying the scientific method and focusing our research on the surrounding fields through a water and soil quality analysis, we have obtained knowledge of how farming activities or even uncontrolled dumping of waste prove to be substantial in the modification of the quality of our environment. Thus, the presence of polluting elements in water like nitrates, phosphates or ammonia, can be attributed to a number of factors such as some farming routines. Olive trees, for instance, are located in fields with high cationic exchange capacity. High levels of microorganisms have been found to cause the high rate of fertility of these soils. On the other hand, the tests done on the wastelands which are too often used as uncontrolled dumping areas rather than farming fields show significant reductions in the amount of beneficiary parameters mentioned above. The whole educational community can benefit from the results and learning processes of this research in terms of a higher environmental awareness.Peer reviewe

    Animales atropellados en la Ruta Transchaco

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    El trabajo tiene el objetivo general de evaluar cualitativa y cuantitativamente el impacto por atropellamientos sobre las poblaciones de vertebrados de la Ruta Nº 9 "Transchaco" para definir propuestas de acciones de prevención y mitigación.CONACYT – Consejo Nacional de Ciencia y TecnologíaPROCIENCI

    Animales atropellados en la Ruta Transchaco

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    El trabajo tiene el objetivo general de evaluar cualitativa y cuantitativamente el impacto por atropellamientos sobre las poblaciones de vertebrados de la Ruta Nº 9 "Transchaco" para definir propuestas de acciones de prevención y mitigación.CONACYT – Consejo Nacional de Ciencia y TecnologíaPROCIENCI

    Evalución del impacto por atropellamiento de fauna de la ruta n° 9 "Dr. Carlos Antonio López" (transchaco), tramo Remanso - Pozo Colorado

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    El trabajo tiene el objetivo general de evaluar cualitativa y cuantitativamente el impacto por atropellamientos sobre las poblaciones de vertebrados de la Ruta Nº 9 "Transchaco" para definir propuestas de acciones de prevención y mitigación.CONACYT – Consejo Nacional de Ciencia y TecnologíaPROCIENCI

    How do languaje teachers motivate their students?

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    Tesis (Psicopedagoga, Licenciado en Educación)Con esta investigación cualitativa se pretende conocer las metodologías utilizadas por los profesores de Lenguaje y Comunicación para mantener a sus alumnos motivados a la hora de aprender. La información se recogerá a través de instrumentos de recolección como lo son la observación y la entrevista. Estos se aplicarán a una muestra de variación máxima, de 10 profesores de segundo ciclo básico, en 7 colegios de la Región Metropolitana y la Región del Libertador Bernardo O’Higgins. Se puede concluir que los profesores para motivar a sus alumnos, apoyan sus clases con nuevas tecnologías, activación de conocimientos previos y problematización. En cuanto a las contribuciones de esta investigación se destaca que tanto profesores como psicopedagogos pueden utilizar los resultados para innovar en relación a la metodología utilizada a la hora de trabajar con los alumnosThe purpose behind this qualitative research is to learn about different methodologies used by language teachers in order to keep their students motivated when they come to a learning process. All the information will be collected through tools such as observation and interviews. These tolls will be applied to a maximum variation sample of 10 teachers who work at schools from Región Metropolitana and Región Del Libertador Bernardo O’Higgins and whose students are between 5th and 8th grade. It can be concluded that teachers motivate their students by using new technologies, prior knowledge activation and problematization. Regarding the contributions of this research it is remarkable that both, teachers and psychopedagogues can take advantage of its results and innovate the way they work whith students

    Influencia de los factores ambientales en el número de ingresos por urgencias en el complejo hospitalario "Juan Canalejo" de la Coruña: elaboración de un modelo de predicción

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    BACKGROUND: This study is aimed at establishing the possible associations between the number of admissions through the emergency room at the "Juan Canalejo" Hospital in Corunna in 1994-1994 due to organic, circulatory and respiratory reasons and the weather variables introduced as being exogenous for the purpose of preparing a prediction model. METHODS: The Box-Jenkins methodology is used for obtaining univariate ARIMA models of the time-based series taken into consideration. Cross-Correlation Functions (CCF’s) are established among the series of residuals which afford the possibility of establishing weights and lags among the variables for a subsequent modeling by means of multivariate ARIMA models which include environmental variables. RESULTS: The emergency admissions for organic reasons significantly increase 0-2 days following a rise in temperature. The admissions due to respiratory ailments are associated with drops in temperature with 10-14 lags, whilst the admissions for circulatory reasons increase significantly due to long-lasting spells of hot weather (10 lags). For people over age 65, significant increases in emergency admissions for circulatory reasons are also recorded with cold snaps. The multivariate ARIMA models that take into account the effect of environmental variables provided the best adjustment for all of the admissions variables. CONCLUSIONS: The number of emergency room admissions at the "Juan Canalejo" Medical Center Complex in Corunna due to organic, respiratory and circulatory causes shows a seasonal behavior pattern. The admissions for respiratory reasons are associated with a drop in temperature, whilst the admissions for circulatory reasons are affected fundamentally by hot weather, although also by cold weather as regards people over age 65. The multivariate ARIMA models including climate-related variables provide a system for predicting admissions in terms of said variables that can be useful from the standpoint of hospital management.FUNDAMENTO: En este trabajo se trata de establecer, respecto al servicio de urgencias del hospital Juan Catalejo de A Coruña, las posibles asociaciones entre el número de ingresos por causas orgánicas, cardiovasculares y respiratorias, y las variables meteorológicas introducidas como variables exógenas con el fin de elaborar un modelo de predicción. MÉTODOS: Se utilizó la metodología de Box-Jenkins para obtener modelos ARIMA univariados de las series temporales consideradas. Se establecen funciones de correlación cruzada (FCC) entre las series de residuales que permitan establecer pesos y retrasos entre las variables, para una posterior modelización mediante modelos ARIMA multivariantes que incluyen variables ambientales. El periodo de tiempo estudiado fue de 1994 a 1996. RESULTADOS: Los ingresos urgentes por causas orgánicas aumentan significativamente entre 0 y 2 días después de un ascenso de la temperatura ambiental. Los ingresos por causas respiratorias se asocian con los descensos de temperatura con 10-14 retrasos, mientras que los ingresos por causas circulatorias se ven aumentados significativamente por el calor a largo plazo (10 retrasos). En mayores de 65 años se registran, además, aumentos significativos de los ingresos urgentes por causas circulatorias, en relación con el frío, a corto plazo. Los modelos ARIMA multivariantes que contemplan el efecto de variables ambientales ofrecieron un mejor ajuste para todas las variables de ingresos. CONCLUSIONES: El número de ingresos en el servicio de urgencias en el Complejo Hospitalario Juan Canalejo de A Coruña por causas orgánicas, respiratorias y circulatorias, presenta un patrón de comportamiento estacional. Los ingresos por causas respiratorias están asociados al descenso de la temperatura ambiental, mientras que los ingresos por causas circulatorias se ven afectados fundamentalmente por el calor, aunque también por el frío, en mayores de 65 años. Los modelos ARIMA multivariantes, incluyendo variables climatológicas, ofrecen un sistema de predicción de ingresos en función de dichas variables que puede ser útil desde el punto de vista de la gestión hospitalaria
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