324 research outputs found

    Collembola of the Cavalum and Landeiro Caves (Madeira, Portugal)

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    The cave fauna of the Macaronesian archipelagos is rich in endemic species. Unlike the Azores and the Canary Islands, the cave fauna of the Madeira archipelago is little known. The only two cave complexes studied, Machico and S√£o Vicente, lack protection measures. S√£o Vicente is seriously threatened because it is being exploited for touristic purposes, while the Machico complex, the only one in its natural state, is open to the public but without any control. The importance of the conservation of this cave fauna is indisputable. So far, of the 13 cavernicolous species recorded, two of them‚ÄĒgenus Centromerus‚ÄĒare critically endangered. Apart from occasional sampling, no monitoring study has ever been carried out. The aim of this work has been to make a species checklist of the cave fauna of the Machico complex, the least studied so far. For this purpose, during 2001‚Äď2002, a monitoring study was carried out using traps and manual collections in the lava tubes of Landeiros and Cavalum (I, II, III). Fourteen species of springtails were recorded. Of these, four are new species, Neelus serratus Jordana & Baquero sp. nov., Coecobrya decemsetosa Jordana & Baquero sp. nov., Coecobrya octoseta Jordana & Baquero sp. nov., and Sinella duodecimoculata Jordana & Baquero sp. nov., and one is a new record for the archipelago, Lepidocyrtus curvicollis Bourlet, 1839

    The molecular conformation, but not disaggregation, of humic acid in water solution plays a crucial role in promoting plant development in the natural environment.

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    Many studies have shown the capacity of soil humic substances (HS) to improve plant growth in natural ecosystems. This effect involves the activation of different processes within the plant at different coordinated molecular, biochemical, and physiological levels. However, the first event triggered by plant root-HS interaction remains unclear. Some studies suggest the hypothesis that the interaction of HS with root exudates involves relevant modification of the molecular conformation of humic self-assembled aggregates, including disaggregation, which might be directly involved in the activation of root responses. To investigate this hypothesis, we have prepared two humic acids. A natural humic acid (HA) and a transformed humic acid obtained from the treatment of HA with fungal laccase (HA enz). We have tested the capacity of the two humic acids to affect plant growth (cucumber and Arabidopsis) and complex Cu. Laccase-treatment did not change the molecular size but increased hydrophobicity, molecular compactness and stability, and rigidity of HA enz. Laccase-treatment avoided the ability of HA to promote shoot- and root-growth in cucumber and Arabidopsis. However, it does not modify Cu complexation features. There is no molecular disaggregation upon the interaction of HA and HA enz with plant roots. The results indicate that the interaction with plant roots induced in both HA and laccase-treated HA (HA enz), changes in their structural features that showed higher compactness and rigidity. These events might result from the interaction of HA and HA enz with specific root exudates that can promote intermolecular crosslinking. In summary, the results indicate that the weakly bond stabilized aggregated conformation (supramolecular-like) of HA plays a crucial role in its ability to promote root and shoot growth. The results also indicate the presence of two main types of HS in the rhizosphere corresponding to those non-interacting with plant roots (forming aggregated molecular assemblies) and those produced after interacting with plant root exudates (forming stable macromolecules)

    Chasing Gravitational Waves with the Chereknov Telescope Array

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    Presented at the 38th International Cosmic Ray Conference (ICRC 2023), 2023 (arXiv:2309.08219)2310.07413International audienceThe detection of gravitational waves from a binary neutron star merger by Advanced LIGO and Advanced Virgo (GW170817), along with the discovery of the electromagnetic counterparts of this gravitational wave event, ushered in a new era of multimessenger astronomy, providing the first direct evidence that BNS mergers are progenitors of short gamma-ray bursts (GRBs). Such events may also produce very-high-energy (VHE, > 100GeV) photons which have yet to be detected in coincidence with a gravitational wave signal. The Cherenkov Telescope Array (CTA) is a next-generation VHE observatory which aims to be indispensable in this search, with an unparalleled sensitivity and ability to slew anywhere on the sky within a few tens of seconds. New observing modes and follow-up strategies are being developed for CTA to rapidly cover localization areas of gravitational wave events that are typically larger than the CTA field of view. This work will evaluate and provide estimations on the expected number of of gravitational wave events that will be observable with CTA, considering both on- and off-axis emission. In addition, we will present and discuss the prospects of potential follow-up strategies with CTA

    Las organizaciones desde una mirada del desarollo sostenible

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    En el presente libro se articulan en dos l√≠neas, a saber, las organizaciones desde la regi√≥n y las organizaciones desde el emprendimiento y la gesti√≥n. En la primera se analizan diferentes tem√°ticas que dejan ver el uso adecuado de la ciencia y la tecnolog√≠a, reconociendo el rol de los sectores tanto p√ļblico como privado y de la sociedad civil en el desarrollo, productividad y competitividad de las organizaciones, por lo que se tienen tem√°ticas como normas internacionales, emprendimiento, tasa representativa del mercado, direccionamiento estrat√©gico en el sector de obras civiles, precios internos y externos del tipo de cambio, que permitan comprender la din√°mica contempor√°nea de las organizaciones, a partir de las experiencias de los diferentes actores que participan en escenarios inclusivos, con el prop√≥sito de evidenciar los elementos de competitividad y perdurabilidad que contribuyen a la internacionalizaci√≥n organizacional.La segunda l√≠nea trata de las organizaciones en la regi√≥n, donde se muestran resultados de investigaciones, como las tendencias mundiales en el sector funerario, estrategias de innovaci√≥n empresarial y responsabilidad social empresarial para Mipymes. Usos agroindustriales de la hoja de coca, factores de competitividad en la ganader√≠a, en el sector metalmec√°nico, redes socio institucionales en el sector l√°cteo, imagen comercial de empresario, estrategia de encadenamiento, patios productivos, aplicaci√≥n del modelo desing thinking, gesti√≥n del conocimiento en Mipymes industriales, ecosistema de emprendimiento, microempresas sostenibles, territorios de paz que dejan ver las nuevas tendencias y tem√°ticas de creatividad e innovaci√≥n para fortalecer la pedagog√≠a, las competencias, las redes de emprendimiento a trav√©s de las herramientas, modelos y estructuras de los esquemas emprendedores, que permitan la continua evoluci√≥n de los mercados emergentes y sus diferentes actores

    cta-observatory/lstosa: v0.10.3

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    On-site data processing pipeline for the LST-

    Collection of inorganic materials to promote the pedagogy of climate change in fifth-year students at the Bethel Educational Institution

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    Para la realización del presente Proyecto de Intervención Educativa-P.I.E., se consideró fundamental hacer una intervención asertiva en los estudiantes del grado Quinto de Primaria de la Institución Educativa Bethel, en el municipio de Sincelejo, departamento de Sucre. Es necesario decir que se aborda a ese grupo de estudiantes por considerar que estos educandos no tienen un adecuado comportamiento que cuide y preserve el ambiente; por tal motivo se contempla fomentar la pedagogía del cambio climático en ellos, para conseguir un cambio relacionado a sus conductas. Por tal motivo se plantea una intervención cuyo nombre es: Cuidar el planeta es la meta. En esta propuesta se emplearon una serie de actividades enfocadas en despertar el interés y motivación en los estudiantes para cumplir las metas ambientales trazadas. Esta investigación se desarrolló con base en un enfoque cualitativo con un tipo de investigación-acción. La técnica de recolección de datos es la Observación Participante y su instrumento es el Diario de Campo. Las conclusiones determinaron que se requiere crear conciencia, no solamente en el grupo de educandos, también se debe hacer en sus familias, razón por la cual se vinculan a las dinámicas planteadas en la estrategia.For the realization of this Educational Intervention Project-P.I.E., it is considered essential to make an assertive intervention in fifth grade students of Primary of the Bethel Educational Institution, in the municipality of Sincelejo, department from Sucre. It is necessary to say that this group of students is approached because it is considered that These students do not have an adequate behavior that cares for and preserves the environment; For this reason, it is contemplated to promote the pedagogy of climate change in them, to achieve a change related to their behaviors. For this reason, an intervention whose name is: Caring for the planet is the goal. In this proposal, a series of activities focused on arousing interest and motivation in students to fulfill the set environmental goals. This research was developed based on an approach qualitative with a type of research-action. The data collection technique is Participant Observation and its instrument is the Field Journal. The conclusions determined that it is necessary to create awareness, not only in the group of students, It should also be done in their families, which is why they are linked to the dynamics set out in the strategy

    The molecular conformation, but not disaggregation, of humic acid in water solution plays a crucial role in promoting plant development in the natural environment

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    Many studies have shown the capacity of soil humic substances (HS) to improve plant growth in natural ecosystems. This effect involves the activation of different processes within the plant at different coordinated molecular, biochemical, and physiological levels. However, the first event triggered by plant root-HS interaction remains unclear. Some studies suggest the hypothesis that the interaction of HS with root exudates involves relevant modification of the molecular conformation of humic self-assembled aggregates, including disaggregation, which might be directly involved in the activation of root responses. To investigate this hypothesis, we have prepared two humic acids. A natural humic acid (HA) and a transformed humic acid obtained from the treatment of HA with fungal laccase (HA enz). We have tested the capacity of the two humic acids to affect plant growth (cucumber and Arabidopsis) and complex Cu. Laccase-treatment did not change the molecular size but increased hydrophobicity, molecular compactness and stability, and rigidity of HA enz. Laccase-treatment avoided the ability of HA to promote shoot- and root-growth in cucumber and Arabidopsis. However, it does not modify Cu complexation features. There is no molecular disaggregation upon the interaction of HA and HA enz with plant roots. The results indicate that the interaction with plant roots induced in both HA and laccase-treated HA (HA enz), changes in their structural features that showed higher compactness and rigidity. These events might result from the interaction of HA and HA enz with specific root exudates that can promote intermolecular crosslinking. In summary, the results indicate that the weakly bond stabilized aggregated conformation (supramolecular-like) of HA plays a crucial role in its ability to promote root and shoot growth. The results also indicate the presence of two main types of HS in the rhizosphere corresponding to those non-interacting with plant roots (forming aggregated molecular assemblies) and those produced after interacting with plant root exudates (forming stable macromolecules)

    Exploring the cost-effectiveness of high versus low perioperative fraction of inspired oxygen in the prevention of surgical site infections among abdominal surgery patients in three low- and middle-income countries

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    Background: This study assessed the potential cost-effectiveness of high (80‚Äď100%) vs low (21‚Äď35%) fraction of inspired oxygen (FiO2) at preventing surgical site infections (SSIs) after abdominal surgery in Nigeria, India, and South Africa. Methods: Decision-analytic models were constructed using best available evidence sourced from unbundled data of an ongoing pilot trial assessing the effectiveness of high FiO2, published literature, and a cost survey in Nigeria, India, and South Africa. Effectiveness was measured as percentage of SSIs at 30 days after surgery, a healthcare perspective was adopted, and costs were reported in US dollars ().Results:HighFiO2maybecost‚ąíeffective(cheaperandeffective).InNigeria,theaveragecostforhighFiO2was). Results: High FiO2 may be cost-effective (cheaper and effective). In Nigeria, the average cost for high FiO2 was 216 compared with 222forlowFiO2leadingtoa¬†‚ąí222 for low FiO2 leading to a¬†‚ąí6 (95% confidence interval [CI]:¬†‚ąí13to¬†‚ąí13 to¬†‚ąí1) difference in costs. In India, the average cost for high FiO2 was 184comparedwith184 compared with 195 for low FiO2 leading to a¬†‚ąí11(9511 (95% CI:¬†‚ąí15 to¬†‚ąí6)differenceincosts.InSouthAfrica,theaveragecostforhighFiO2was6) difference in costs. In South Africa, the average cost for high FiO2 was 1164 compared with 1257forlowFiO2leadingtoa¬†‚ąí1257 for low FiO2 leading to a¬†‚ąí93 (95% CI:¬†‚ąí132to¬†‚ąí132 to¬†‚ąí65) difference in costs. The high FiO2 arm had few SSIs, 7.33% compared with 8.38% for low FiO2, leading to a¬†‚ąí1.05 (95% CI:¬†‚ąí1.14 to¬†‚ąí0.90) percentage point reduction in SSIs. Conclusion: High FiO2 could be cost-effective at preventing SSIs in the three countries but further data from large clinical trials are required to confirm this

    Chasing Gravitational Waves with the Chereknov Telescope Array

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    Presented at the 38th International Cosmic Ray Conference (ICRC 2023), 2023 (arXiv:2309.08219)2310.07413International audienceThe detection of gravitational waves from a binary neutron star merger by Advanced LIGO and Advanced Virgo (GW170817), along with the discovery of the electromagnetic counterparts of this gravitational wave event, ushered in a new era of multimessenger astronomy, providing the first direct evidence that BNS mergers are progenitors of short gamma-ray bursts (GRBs). Such events may also produce very-high-energy (VHE, > 100GeV) photons which have yet to be detected in coincidence with a gravitational wave signal. The Cherenkov Telescope Array (CTA) is a next-generation VHE observatory which aims to be indispensable in this search, with an unparalleled sensitivity and ability to slew anywhere on the sky within a few tens of seconds. New observing modes and follow-up strategies are being developed for CTA to rapidly cover localization areas of gravitational wave events that are typically larger than the CTA field of view. This work will evaluate and provide estimations on the expected number of of gravitational wave events that will be observable with CTA, considering both on- and off-axis emission. In addition, we will present and discuss the prospects of potential follow-up strategies with CTA
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