Evaluación del crecimiento de langostino blanco Litopenaeus vannamei cultivado en jaulas flotantes en la laguna Ñapique, distrito de San Cristo, Sechura-Piura

Se ha identificado en la zonas aledañas a la laguna Ñapique,la escasez de oportunidades de desarrollo de actividades económicas y rentables para los pobladores de Cerritos, Cristo NosValga, Onza de Oro, Santa Clara, Alto Huaraz, Chutuque, Laguna de San Ramón, Valverde, y MalaVida, quienes se dedican a actividades agropecuarias primarias la que absorbe una gran masas de la población económicamente activa, con un rendimiento promedio por debajo del promedio departamental de Piura cuenta con dos grandes reservorios e innumerables cuerpos de agua como lagunas y reservorios pequeños que utilizan los agricultores para sus actividades agrícolas, los mismo que presentan condiciones ecológicas favorables para la explotación acuícola de los recursos hidrobiológicos. La Dirección Regional de Pesquería considera potencialmente valido el desarrollo de la acuicultura en estos ambientes y dentro de los lineamientos de la política actual promueven el desarrollo de la acuicultura para lograr uno de los principales objetivos: vencer la pobreza y la desnutrición (ley No 27460 y reglamento, 2001). Una oportunidad para incrementar y desarrollar la economía de la zona es la actividad acuícola aprovechando la laguna Ñapique mediante el cultivo de langostino blanco Litopenaeus vananmei,en jaulas flotantes, integrado a actividades como la pesca artesanal y turismo. El impacto de dicha actividad generaría un efecto multiplicador a nivel regional sobre todo en los diferentes reservorios de agua del valle de San Lorenzo que se aproximan a las 200 ha y directamente beneficiaría a los 14.455 pobladores del distrito de Cristo Nos Valga, con la creación de puestos de trabajo, incremento de la producción pesquera, disminuir el índice de desnutrición y el índice de extrema pobreza. El objetivo principal fue evaluar el crecimiento durante todo el cultivo del langostino blanco Litopenaeus vananmei en jaulas flotantes, aprovechando el cuerpo de agua laguna Ñapique de manera ecológicamente sostenible, evaluando la densidad optima en la fase de precría y engorde, las tasa de crecimiento, rendimiento en biomasa, supervivencia y factor de conversión alimenticia

Comunicación, sentido y vida cotidiana

La pregunta por la vida cotidiana, su estructura, su funcionamiento, no es una novedad en el ámbito de las ciencias sociales. Se han ocupado de esta problemática pensadores de la talla de Heller, Habermas, Goffman, Freiré, Wolf, por citar sólo algunos. Diferentes enfoques, teorías y preocupaciones han derivado en un vasto campo de estudio que observa y rescata lo que era considerado como "materiales secundarios", indagando cómo los pequeñísimos actos cotidianos realzan temas muy importantes (Wolf, 1979). En el campo de la comunicación cobran fuerza en cantidad y calidad, a partir de 1980 (Fuentes, 1991) los estudios que abordan diferentes aspectos de la cotidianidad para indagar por ejemplo, en un cambio de perspectiva, no ya lo que los medios hacen a la gente, sino lo que la gente hace con y a partir de los medios, haciendo aparecer en primer plano al actor de la comunicación.ITESO, A.C

Un análisis transversal del ecoturismo: Arte místico y riesgo alternativo

En el marco de promoción del emprendimiento local para el desarrollo regional sustentable, los estudios del turismo se han centrado en el análisis de la experiencia vital como antecedente de la satisfacción turística y el retorno vacacional, pero sin considerarlos como parte de un ciclo de recreación y esparcimiento que podría ser explicado desde las representaciones sociales. En tal sentido, se llevó a cabo un trabajo exploratorio, transversal y cualitativo con una selección de informantes, considerando sus recorridos a un museo natural surrealista del centro de México. Las interpretaciones en torno a las respuestas a preguntas derivadas de las categorías de núcleo de esparcimiento, periferia recreativa y experiencia vacacional muestran similitudes en cuanto a la búsqueda de un significado del recorrido y el escenario, pero también diferencias en cuanto a la integración con el escenario, orientando futuras líneas de investigación hacia las diferencias entre generacione

In situ genesis of selective adsorption sites by complex catalytic redox dynamics

Several in situ studies have revealed spatiotemporal dynamics on heterogeneous catalysts surfaces under chemical stimuli1-4, which presumably control the activity, selectivity, and productivity5-11. However, operando validations of sufficient spacetime resolution12 are often missing, and hence, the effect of these dynamics on catalytic performance may not be entirely clear. Here, using dry reforming of methane over Ni as an example, we demonstrate the relevance of catalytic redox dynamics for reaction performance and determine their genesis from adaptive chemistry and continual catalytic cycling. By combining operando scanning electron microscopy and near-ambient-pressure X-ray photoelectron spectroscopy, we found that activation sites for methane and carbon dioxide differed but continually transformed into each other during the reaction. This behavior enabled a self-sustained oscillating regime evincing the sequential formation of active sites. We also found that not all spatiotemporal dynamics accounted for the catalytic function. We highlight the importance of oscillating reactions for mechanistic studies and propose that the generation of mechanical strain at the catalyst during redox cycling acted as a feedback element for the oscillations. These observations lead to deeper understanding of fundamental catalysis and open new opportunities for tuning catalytic performances

CDH1 somatic alterations in Mexican patients with diffuse and mixed sporadic gastric cancer

Background: Diffuse gastric cancer (DGC) is associated with the reduction or absence of the expression of the cell adhesion protein E-cadherin (encoded by the CDH1 gene). Molecular characteristics are less well described for mixed gastric cancer (MGC). The main somatic alterations that have been described in the CDH1 gene are mutations, loss of heterozygosity (LOH) and promoter methylation. The aim was to analyze CDH1 somatic alterations in Mexican patients with diffuse and mixed gastric cancer. Methods: We searched for mutations in the CDH1 gene in tumor DNA from DGC (n = 13) and MGC (n = 7) patients by next generation sequencing (NGS). Validation of findings was performed using Sanger sequencing. LOH was analyzed using dinucleotide repeat markers surrounding the CDH1 gene, and methylation was investigated by DNA bisulfite conversion and sequencing. E-cadherin protein deficiency was analyzed by immunohistochemistry. Results: Seventeen point variants were identified by NGS, 13 of them were validated by Sanger sequencing. Only 1/13 had not been previously reported (c.-137C > A), and 12/13 were already reported as polymorphisms. Two DGC cases presented LOH at the locus 16q22.1 (13.3%). CDH1 promoter methylation was positive in (7/11) 63.6% and (4/6) 66.6% of the cases with DGC and MGC, respectively. E-cadherin protein deficiency was observed in 58.3% of DGC cases while 100% in MGC cases. Conclusions: While no pathogenic somatic mutations were found that could explain the diffuse histology of gastric cancer in DGC and MGC, methylation was the most common somatic inactivation event of the CDH1 gene, and LOH was rare. The previously unreported c.-137C > A variant modify the CDH1 gene expression since it alters the binding sites for transcription factors.This work was supported by the “Consejo Nacional de Ciencia y Tecnología (CONACYT)” (grant Ciencia Básica 2013–1-222972) and by the “Fondo de Investigación en Salud (FIS), Instituto Mexicano del Seguro Social (IMSS)” (grant FIS/IMSS/PROT/G13/1189), that contributed to the design of the study, collection, analysis, interpretation of data and writing the manuscript. We thank the following institutions: 1) Coordinación de Investigación en Salud (CIS), Instituto Mexicano del Seguro Social (IMSS) for the support given to ARBC, through the Professional Development in the International Research of Graduate Students (PRODESI) program; 2) Fundación IMSS, A.C. for the research grant awarded to JYSL and MTMT; 3) FEDER - Fundo Europeu de Desenvolvimento Regional funds through the COMPETE 2020 - Operational Programme for Competitiveness and Internationalisation (POCI), Portugal 2020, and by Portuguese funds through FCT/ Ministério da Ciência, Tecnologia e Inovação in the framework of the project “Institute for Research and Innovation in Health Sciences” (POCI-01-0145-FEDER-007274); 4) The project NORTE-01-0145-FEDER-000029, supported by Norte Portugal Regional Programme (NORTE 2020), under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF); 5) FCT fellowships (SFRH/BPD/86543/2012 to JC; SFRH/BPD/89764/2012 to PO; PD/ BD/128007/2016 to AS). IPATIMUP integrates the i3S Research Unit, which is partially supported by FCT, the Portuguese Foundation for Science and Technology

Predicting potential distribution and identifying priority areas for conservation of the Yellow-tailed Woolly Monkey (Lagothrix flavicauda) in Peru

Species distribution models (SDMs) provide conservationist with spatial distributions estimations of priority species. Lagothrix flavicauda (Humboldt, 1812), commonly known as the Yellow-tailed Woolly Monkey, is one of the largest primates in the New World. This species is endemic to the montane forests of northern Peru, in the departments of Amazonas, San Martín, Huánuco, Junín, La Libertad, and Loreto at elevation from1,000 to 2,800 m. It is classified as “Critically Endangered” (CR) by the International Union for Conservation of Nature (IUCN) as well as by Peruvian legislation. Furthermore, it is listed in Appendix I of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Research on precise estimates of its potential distribution are scare. Therefore, in this study we modeled the potential distribution area of this species in Peru, the model was generated using the MaxEnt algorithm, along with 80 georeferenced occurrence records and 28 environmental variables. The total distribution (high, moderate, and low) for L. flavicauda is 29,383.3 km2, having 3,480.7 km2 as high potential distribution. In effect, 22.64 % (6,648.49 km2) of the total distribution area of L. flavicauda is found within Natural Protected Areas (NPAs), with the following categories representing the largest areas of distribution: Protected Forests (1,620.41 km2), Regional Conservation Areas (1,976.79 km2), and Private Conservation Areas (1,166.55 km2). After comparing the predicted distribution with the current NPAs system, we identified new priority areas for the conservation of the species. We, therefore, believe that this study will contribute significantly to the conservation of L. flavicauda in Peru

Immobilization of Aspergillus niger lipase on chitosan-coated magnetic nanoparticles using two covalent-binding methods

Aspergillus niger lipase immobilization by covalent binding on chitosan-coated magnetic nanoparticles (CMNP), obtained by one-step co-precipitation, was studied. Hydroxyl and amino groups of support were activated using glycidol and glutaraldehyde, respectively. Fourier transform infrared spectrometry, high-resolution transmission electron microscopy and thermogravimetric analysis confirmed reaction of these coupling agents with the enzyme and achievement of a successful immobilization. The derivatives showed activities of 309.5 ± 2.0 and 266.2 ± 2.8 U (g support)(-1) for the CMNP treated with glutaraldehyde and with glycidol, respectively. Immobilization enhanced the enzyme stability against changes of pH and temperature, compared to free lipase. Furthermore, the kinetic parameters K m and V max were determined for the free and immobilized enzyme. K m value quantified for enzyme immobilized by means of glutaraldehyde was 1.7 times lowers than for free lipase. High storage stability during 50 days was observed in the immobilized derivatives. Finally, immobilized derivatives retained above 80% of their initial activity after 15 hydrolytic cycles. The immobilized enzyme can be applied in various biotechnological processes involving magnetic separation.Fil: Osuna, Yolanda. Universidad Autónoma de Coahuila; MéxicoFil: Sandoval, José. Universidad Autónoma de Coahuila; MéxicoFil: Saade, Hened. Centro de Investigación en Química Aplicada; MéxicoFil: López, Raúl G.. Centro de Investigación en Química Aplicada; MéxicoFil: Martinez, José L.. Universidad Autónoma de Coahuila; MéxicoFil: Colunga, Edith M.. Universidad Autónoma de Coahuila; MéxicoFil: de la Cruz, Gabriela. Universidad Autónoma de Coahuila; MéxicoFil: Segura, Elda P.. Universidad Autónoma de Coahuila; MéxicoFil: Arevalo, Fernando Javier. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Zon, María Alicia. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fernandez, Hector. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ilyina, Anna. Universidad Autónoma de Coahuila; Méxic

Análisis cuantitativo de ácidos grasos en harina de Prosopis laevigata

Ripe mesquite pods are widely consumed by humans and animals in arid and semi-arid areas for their protein, carbohydrate, crude fiber and fat contents. The goal of this work is to identify and to quantify the fatty acid profile of flour from mesquite pods. Structural assignments were confirmed by the analysis of fragmentation patterns of mass spectra obtained by GC-MS. The results showed that 75% of the fatty acids were unsaturated, of which linoleic acid was predominant, while palmitic and stearic acids, and saturated fatty acids were found in minor proportions.Las vainas de mezquite maduro son ampliamente consumidas por humanos y animales en las zonas áridas y semiáridas por su contenido de proteínas, carbohidratos, fibra cruda y grasas. El propósito de este trabajo es identificar y cuantificar el perfil de ácidos grasos de harinas de vainas mezquite. La estructura química fue confirmada mediante el análisis de los fragmentos del espectro de masas obtenidos por GC-MS. Los resultados mostraron que el 75% de los ácidos grasos fueron insaturados, de los cuales, el ácido linoleico predomina mientras que el ácido pálmico y esteárico, ambos ácidos grasos saturados, fueron encontrados en menor proporción

From passionate labour to compassionate work: Cultural co-ops, do what you love and social change

This article focuses on the relation between work and pleasure in the cultural sector. I first unpack the concept of passionate work, situating it within four possible ways of relating work and pleasure. I argue that the work ethic of do what you love, contrary to what it promises, limits the prospects of loveable work. As part of a neoliberal work culture, do what you love transfers the battleground from society onto the self. It favours self-management over politics. Drawing on findings from interview research with members of worker co-operatives in the UK cultural industries, I then go on to explore the relation between work and pleasure within cultural co-ops. I discuss how cultural co-ops might inspire and contribute to a movement for transforming the future of work by turning the desire for loveable work from a matter of individual transformation and competition into a practice of co-operation and social change

The Sensitivity of HAWC to High-Mass Dark Matter Annihilations

The High Altitude Water Cherenkov (HAWC) observatory is a wide field-of-view detector sensitive to gamma rays of 100 GeV to a few hundred TeV. Located in central Mexico at 19 degrees North latitude and 4100 m above sea level, HAWC will observe gamma rays and cosmic rays with an array of water Cherenkov detectors. The full HAWC array is scheduled to be operational in Spring 2015. In this paper, we study the HAWC sensitivity to the gamma-ray signatures of high-mass (multi- TeV) dark matter annihilation. The HAWC observatory will be sensitive to diverse searches for dark matter annihilation, including annihilation from extended dark matter sources, the diffuse gamma-ray emission from dark matter annihilation, and gamma-ray emission from non-luminous dark matter subhalos. Here we consider the HAWC sensitivity to a subset of these sources, including dwarf galaxies, the M31 galaxy, the Virgo cluster, and the Galactic center. We simulate the HAWC response to gamma rays from these sources in several well-motivated dark matter annihilation channels. If no gamma-ray excess is observed, we show the limits HAWC can place on the dark matter cross-section from these sources. In particular, in the case of dark matter annihilation into gauge bosons, HAWC will be able to detect a narrow range of dark matter masses to cross-sections below thermal. HAWC should also be sensitive to non-thermal cross-sections for masses up to nearly 1000 TeV. The constraints placed by HAWC on the dark matter cross-section from known sources should be competitive with current limits in the mass range where HAWC has similar sensitivity. HAWC can additionally explore higher dark matter masses than are currently constrained.Comment: 15 pages, 4 figures, version to be published in PR