One-loop effective multi-gluon Lagrangian in arbitrary dimensions

We exhibit the one-loop multi-gluon effective Lagrangian in any dimension for a field theory with a quasilocal background, using the background-field formalism. Specific results, including counter terms (up to 12 spacetime dimensions), have been derived, applied to the Yang-Mills theory and found to be in agreement with other string-inspired approaches.Comment: 16 pages, LaTe

Granitoides del Centro Oeste de la Provincia de Salamanca. Clasificación y correlación

[Resumen] En las rocas graníticas de la zona centro-oeste de la provincia de Salamanca, pueden establecerse tres grupos. Los dos primeros formados por leucogranitos y granitos de dos micas de tendencia alcalina, y el tercero por granitos de tendencia calcoalcalina que evolucionan hacia términos alcalinos convergentes con los anteriores. La descripción de estos granitoides así como su correlación con las clasificaciones existentes de dominios regionales, son el objeto del presente trabajo

Clave para la determinación de exuvias pupales de los quironómidos (Diptera: Chironomidae) de ríos altoandinos tropicales

The Chironomidae is a cosmopolitan family of Nematoceran flies with more than 20 000 species described. However the diversity of genera and species of the family in the Andean region beyond the 2 000m.a.s.l are scarcely known. We conducted faunal surveys and biomonitoring research in different streams of Colombia, Ecuador and Peru from May 2005 to October 2011. Based on specimens collections, and a taxonomic key was developed to identify pupae and pupal exuviae of 46 genera of midges (Diptera, Chironomidae) collected from streams at high altitude areas on the Andean tropical mountains. We included illustrations and brief taxonomic descriptions for all genera, of which several ones have not yet been formally described; in this latter case we used the nomenclature of Roback & Coffman (1983). For two genera, Cricotopus and Genus 1, keys to the most common morphospecies were provided. Results showed that in this area the chironomid assemblages are dominated by the members of the subfamily Orthocladiinae (22 genera) followed by the Chironominae (13). Six genera of Tanypodinae were identified, while only three and two genera were present from subfamilies Podonominae and Diamesinae. This key may be very useful for both studies about drift in streams, and for biomonitoring purposes

New Perspectives Related to the Bioluminescent System in Dinoflagellates: Pyrocystis lunula, a Case Study

Pyrocystis lunula is considered a model organism due to its bioluminescence capacity linked to circadian rhythms. The mechanisms underlying the bioluminescent phenomenon have been well characterized in dinoflagellates; however, there are still some aspects that remain an enigma. Such is the case of the presence and diversity of the luciferin-binding protein (LBP), as well as the synthesis process of luciferin. Here we carry out a review of the literature in relation to the molecular players responsible for bioluminescence in dinoflagellates, with particular interest in P. lunula. We also carried out a phylogenetic analysis of the conservation of protein sequence, structure and evolutionary pattern of these key players. The basic structure of the luciferase (LCF) is quite conserved among the sequences reported to date for dinoflagellate species, but not in the case of the LBP, which has proven to be more variable in terms of sequence and structure. In the case of luciferin, its synthesis has been shown to be complex process with more than one metabolic pathway involved. The glutathione S-transferase (GST) and the P630 or blue compound, seem to be involved in this process. In the same way, various hypotheses regarding the role of bioluminescence in dinoflagellates are exposed

Sistema accesible, interoperable y ubicuo para el acceso a las nuevas tecnologías por parte de las personas con necesidades especiales

The possibility to access communication and information is indispensable to achieve equality of opportunities and full citizenship participation. However, people with some sort of handicap find themselves with environments, services and products inaccessible for them and making their daily life more difficult. Communication barriers are those obstacles that prevent these people to access information. Advance in information technologies and communications, diminishing in hardware costs and information transmission rates allows us today to develop tools that give people with special needs access to new technologies. CIM Fundation has been collaborating in the development of an accessible and ubiquitous platform for people with special needs as part of his participation in the INREDIS project within the CENIT Program. The objective of this project is the development of a system that offers a multiplatform, adaptive and natural interface that responds with intelligence to the user’s needs. The platform has been developed with a Software Oriented Architecture (SOA) and within Software as a Service model (SaaS).Peer ReviewedPostprint (published version

A versatile route to modify polyethersulfone membranes by chemical reduction of aryldiazonium salts

International audienceUltrafiltration polyethersulfone membranes were modified covalently by chemical reduction of aryl diazonium salts. Functionalizations were performed with four aryl diazonium salts bearing different functional groups (4-benzyltriphenylphosphonium diazonium, 4-nitrophenyl diazonium, 4-benzonitrile diazonium and 4-phenylacetic acid diazonium) so as to demonstrate the versatility of the method. The efficiency of the different functionalizations was checked with various characterization techniques. Attenuated Total Reflectance Fourier Transform Infra Red spectroscopy revealed the presence of 4-nitrophenyl, 4-benzonitrile and 4-phenylacetic acid groups at the surface of the different modified membranes but no characteristic vibration band was detected on the surface of the membrane modified with 4-benzyltriphenylphosphonium diazonium. The presence of 4-benzyltriphenylphosphonium, however, could be demonstrated by both Energy Dispersive X-ray spectroscopy (detection of the Kα ray of phosphorous at 2.015 keV) and streaming current measurements (shift of the membrane isoelectric point). Finally, dead-end filtration of an antibiotic (tylosin) was carried out with the unmodified membrane and the membrane modified by 4-benzyltriphenyl-phosphonium diazonium. Experiments revealed that the transport properties of the grafted membrane were significantly modified, with a significant increase in rejection mainly due to electrostatic repulsions between the surface of the modified membrane and tylosin

Participatory Breeding on Organic Vegetables

Development of organic vegetable varieties was done through participatory breeding in Regions 4A, 4B, 8 and 12 in the Philippines. Farmer co-operators were trained and seeds of segregating lines and populations which served as their starting materials were provided to them. The materials were evaluated in their respective farms along with continuous selection and seed production. Co-operators were able to select lines of various vegetable crops and seed produce them

Teaching and Learning Mathematics Using Facebook Group: NA

Almost every organization makes use of a Facebook group. They utilized it to debate themes and other problems concerning their own survival. Numerous mathematics instructors have already embraced its usefulness as a method of providing instructional materials to their pupils in the modern day. With these factors in mind, this research study on the use of Facebook groups in the teaching-learning process of mathematics was performed with the pioneer batch of ABM students at the University of San Carlos – Senior High School in Cebu City, Philippines. Through this amazing and updated communication medium, the kids learnt a new lesson. The statistical study revealed that the use of Facebook groups in the teaching-learning process of mathematics is beneficial. This is shown by the statistical equality of the experimental and control groups' post-test results. This demonstrates that the performance of students in the experimental and control groups is comparable. This is because the experimental groups did not participate in classroom discussions yet fared as well as the controls groups who did. Additional pertinent results from the research are provided in this article