WorldWideScience

Sample records for algas problemas emergentes

  1. A obesidade infantil: um problema emergente

    OpenAIRE

    Sousa, Joana; Loureiro, Isabel; Carmo, Isabel do

    2008-01-01

    A obesidade é um dos problemas de saúde mais graves que afecta crianças e adolescentes a nível mundial. As evidências sugerem que o problema está a agravar-se rapidamente. O aumento da prevalência de obesidade infantil pode fazer com que a próxima geração apresente indicadores de obesidade no adulto superiores aos indicadores actuais. Pelo facto de a obesidade estar intimamente associada a diferentes patologias crónicas faz com que estejamos perante um enorme desafio para o sistema de cuidado...

  2. Problemas bioéticos emergentes de la inteligencia artificial

    Directory of Open Access Journals (Sweden)

    Jairo Andrés Villalba Gómez

    2016-01-01

    Full Text Available El presente artículo de revisión, relaciona de forma analítica los conceptos entre bioética e inteligencia artificial, identificando los elementos técnicofilosóficos tales como: transhumanismo, inteligencia artificial y bioética de la tecnología; cuyo orden transdisciplinar, evoluciona en cuestionamientos científicos basados en la evolución de la tecnociencia del siglo XXI. Se identificarán los referentes conceptuales de la relación entre transhumanismo (H+ e inteligencia artificial (IA, su génesis, enfoques, fundamentos disciplinares, así como los elementos básicos que hacen posible la arquitectura en un sistema de inteligencia artificial, precisando así el ambiente prospectivo en el que se consolida una “era” basada en la “singularidad tecnológica”, para finalmente concluir en una descripción de algunos problemas ético-filosóficos que emergen en la evolución de la inteligencia artificial.

  3. Emergentism

    Directory of Open Access Journals (Sweden)

    Carlos Beorlegui

    2015-02-01

    Full Text Available We may wonder if the emergentist model owes too much to the two traditional alternative approaches (first or third person, although it is aware of its weaknesses it fails to complete its interesting contribution with an anthropological approach that may consider mind and mental phenomena as a reality that emerges, matures, develops and expresses itself in its unavoidable interpersonal and social contexts, as is shown by the psychological and anthropological research into the study of the development of human personality. We consider that three complementary elements or dimensions should be taken into account: the evolutionary aspect (the biological maturing process of the brain, which represents the jump from prehuman to human existence; the systemic aspect (the systemic way to understand the mind as the total structure of the brain; and the social aspect (the interpersonal and social dimension as the field where the mind and the person originate. It is only within the context of human society that each personal reality can be shaped as such. Thus, this proposal could be referred to as psycho-social-systemic emergentism.

  4. Síndrome de Sensibilidad Múltiple a sustancias químicas: un problema ambiental emergente

    Directory of Open Access Journals (Sweden)

    E. Ordaz Castillo

    2001-11-01

    Full Text Available El Síndrome de Sensibilidad Múltiple (SSM es un conjunto de múltiples síntomas asociados producidos tras la exposición a agentes químicos a muy bajas concentraciones.Se han propuesto diferentes teorías para explicar sus causas, incluyendo alergia, efectos tóxicos y sensibilización neurobiológica. La evidencia científica es insuficiente para confirmar la relación entre las posibles causas y los síntomas. Los pacientes con SSM presentan depresión, ansiedad y trastornos somatoformes, pero no está clara la relación existente entre este síndrome y los problemas psiquiátricos.El objetivo de esta revisión es presentar de forma resumida el estado actual del conocimiento del tema.

  5. Resistencia emergente a los antibióticos: una amenaza global y un problema crítico en el cuidado de la salud

    Directory of Open Access Journals (Sweden)

    Claudio Rocha

    Full Text Available Después del desarrollo y la comercialización en masa de los antibióticos, las bacterias patógenas y ambientales han desa- rrollado resistencia a los antibióticos desde el siglo pasado, de modo que la infección causada por organismos resistentes a los antibióticos (ORAs podría ser considerada como una infección emergente. Debido a ello, su control debe ser priorizado ya que constituye una amenaza para todas las naciones, sin reparar en su territorio y situación económica. El incremento de la vigilancia en Estados Unidos de América, Europa y Asia Oriental ha ilustrado lo rápido que pueden diseminarse, trayendo como consecuencia un incremento en la carga de infecciones causadas por los ORAs, sin embargo, la información disponible en los países de continuo desarrollo en América Latina es limitada. Esta revisión describe información reciente de estudios de vigilancia de ORAs en América Latina, así como también fuentes comunes de ORAs y posibles estrategias para su control.

  6. La competencia informacional desde una perspectiva psicoeducativa: enseñanza basada en la resolución de problemas prototípicos y emergentes

    Directory of Open Access Journals (Sweden)

    Monereo, Carles

    2012-07-01

    Full Text Available This article contributes from a psycho-educational perspective to the definition and characterization of the concept of informational competency in teaching and learning in school-based education and in the training of information professionals. The first section defines a competent person as one who is able to adequately solve a set of typical problems stemming from a particular social or community practice. Based on this definition, the authors then identify and characterize informational problems and the most significant incidents faced by students during their school work, which are grouped into three sections: the demand and the conditions through which it is satisfied; the presence and the activation of beliefs, conceptions and relevant knowledge; and the regulation of decisions, emotions and interactions with others. The text then presents some guidelines for training in information skills, based on authentic tasks. The article concludes by reflecting on the implementation of innovative educational experiences for the development of informational competency in the context of formal education.

    Se realiza una aportación desde un punto de vista psicoeducativo a la definición y caracterización de la noción de competencia informacional, a su enseñanza y aprendizaje en la educación escolar, y a la formación de los profesionales de la información. En el primer apartado, se define una persona competente como aquella que es capaz de resolver adecuadamente un conjunto de problemas característicos de una determinada práctica social y comunitaria. Seguidamente, tomando como base esta definición, se identifican y caracterizan los problemas e incidentes informacionales más significativos que deben afrontar los estudiantes durante sus tareas escolares, agrupados en tres grandes bloques: relativos a la demanda y a las condiciones de su resolución; relacionados con la presencia y la activación de creencias, concepciones y

  7. Síndrome de Sensibilidad Múltiple a sustancias químicas: un problema ambiental emergente Multiple Chemical Sensitivity syndrome: an arising environmental problem

    Directory of Open Access Journals (Sweden)

    F. Marqués Marqués

    2001-11-01

    Full Text Available El Síndrome de Sensibilidad Múltiple (SSM es un conjunto de múltiples síntomas asociados producidos tras la exposición a agentes químicos a muy bajas concentraciones.Se han propuesto diferentes teorías para explicar sus causas, incluyendo alergia, efectos tóxicos y sensibilización neurobiológica. La evidencia científica es insuficiente para confirmar la relación entre las posibles causas y los síntomas. Los pacientes con SSM presentan depresión, ansiedad y trastornos somatoformes, pero no está clara la relación existente entre este síndrome y los problemas psiquiátricos.El objetivo de esta revisión es presentar de forma resumida el estado actual del conocimiento del tema.Multiple Chemical sensitivity (MCS is a syndrome in which multiple symptoms reportedly occur with low-level chemical exposure. Several theories have been advanced to explain the cause of MCS, including allergy, toxic effects and neurobiological sensitisation. There is insufficient scientific evidence to confirm a relationship between any of these possible cause and symptoms. Patients with MCS have high rates of depression, anxiety and somatoforms disorders, but it is unclear is a causal relationship or merely an association exists between MCS and psychiatric problems.The aim of these review is showed the stated of the art about the Mutiple Chemical Sensitivity

  8. Algae

    Czech Academy of Sciences Publication Activity Database

    Raven, John A.; Giordano, Mario

    2014-01-01

    Roč. 24, č. 13 (2014), s. 590-595 ISSN 0960-9822 Institutional support: RVO:61388971 Keywords : algae * life cycle * evolution Subject RIV: EE - Microbiology, Virology Impact factor: 9.571, year: 2014

  9. Seroprevalencia de la hepatitis C en adultos de México: ¿un problema de salud pública emergente? Seroprevalence of hepatitis C among Mexican adults: an emerging public health problem?

    Directory of Open Access Journals (Sweden)

    José Luis Valdespino

    2007-01-01

    Full Text Available OBJETIVO: La infección por virus de la hepatitis (VHC evoluciona hacia la cronicidad en 60 a 85% de los sujetos que la sufren y ocasiona cirrosis hepática y cáncer primario de hígado. El objetivo de este estudio fue notificar la seroprevalencia de infección por VHC en una muestra probabilística de la población en el plano nacional. MATERIAL Y MÉTODOS: Se estudiaron 21 271 sueros seleccionados de manera aleatoria de la Encuesta Nacional de Salud 2000, para anti-VHC y RNA de VHC. El estudio se realizó en el Instituto Nacional de Salud Pública en el año 2005. RESULTADOS: La seroprevalencia de los anticuerpos VHC fue de 1.4% (IC95% 1.1-1.6 y 35.7% tenía infección activa. Los factores de riesgo de infección de VHC detectados son el antecedente de consumo de heroína (RM=9.8, IC: 2.1-41.4, estar separado (RM=2.6, IC: 1.1-5.9 o ser viudo (RM=2.2, IC: 1.1-4.3 y residir en la región norte del país (RM=1.9, IC: 1.1-3.2. CONCLUSIONES: Los datos indican que la hepatitis C es un problema de salud pública emergente en México. Los factores de riesgo de infección indican que la transmisión más frecuente de los infectados ocurre en receptores de sangre y hemoderivados (antes de 1996 y, de manera secundaria, por drogadicción intravenosa y de tipo sexual.OBJECTIVE: Hepatitis C Virus (HCV infection is becoming a chronic disease in 60-85% of individuals and is a cause of hepatic cirrhosis and hepatocellular carcinoma. The objective of this study was to report the seroprevalence of HCV infection in a probabilistic sample of the Mexican population. MATERIAL AND METHODS: This study is based on information obtained from the National Health Survey conducted in 2000. A total of 21 271 sera randomly selected for anti-HCV and RNA of HCV was studied. It was performed at the National Institute of Public Health in 2005. RESULTS: Seroprevalence of HCV antibodies was 1.4% (IC95% 1.1%-1.6%, of which 35.7% had active infection. Risk factors for infection were

  10. Enfermedades emergentes y re-emergentes

    Directory of Open Access Journals (Sweden)

    Augusto Corredor Arjona

    1996-01-01

    Full Text Available Ante el surgimiento del Virus de la Inmunodeficiencia Humana, HIV, del Síndrome de la Inmuno Deficiencia Adquirida, SIDA, y del mortal virus del Ebola, que azotó al Zaire durante el año de 1995, el Instituto de Medicina de los Estados Unidos de América constituyo el Comité de Amenazas Microbianas Emergentes para la Salud, conformado por especialistas de varias disciplinas del área y le encargo identificar las enfermedades infecciosas emergentes con mayor significancia, determinar las acciones para su intervención y recomendar como se podrían enfrentar amenazas futuras similares, para aminorar su impacto sobre la salud pública.

  11. Educación-comunicación-tecnología, un campo emergente: retos y problemas en los escenarios epistemológicos y políticos del mundo actual

    Directory of Open Access Journals (Sweden)

    Álvaro Acevedo Tarazona

    2008-01-01

    Full Text Available La historia de la educación es también una forma de abordar el gran campo de la educación si se asume éste como el devenir de aquellas acciones que se dirigen a modificar la conducta humana mediante la enseñanza de lenguajes y la puesta en ejecución de actividades, operaciones concretas, prácticas (didácticas, tanto en los espacios formales como no formales (la escuela, la universidad. La presente reflexión tiene como propósito dirigir la discusión sobre algunos temas considerados hoy fundamentales en la docencia, sobre todo ante a los nuevos retos que entraña los cambios epistemológicos y las prácticas en la educación. Estos temas son: la crisis del proyecto educativo de la modernidad; la educación-comunicación-tecnología, un campo emergente; la inquietante pregunta por la muerte del libro, la mutación de los desarrollos disciplinarios y, por último, el docente como un agente del cambio social.

  12. Educación musical: un problema emergente de intervención educativa. Indicadores pedagógicos para el desarrollo de competencias en educación musical

    OpenAIRE

    Longueira Matos, Silvana

    2012-01-01

    Se plantea la educación musical como un problema pedagógico. Educación «para» la música, vocacional y profesional, no se confunde con educación «por» la música, ámbito de educación general y ámbito general de educación que, desde la experiencia y la expresión musical, desarrolla competencias generales.

  13. Problemas bioéticos emergentes de la inteligencia artificial

    OpenAIRE

    Jairo Andrés Villalba Gómez

    2016-01-01

    El presente artículo de revisión, relaciona de forma analítica los conceptos entre bioética e inteligencia artificial, identificando los elementos técnicofilosóficos tales como: transhumanismo, inteligencia artificial y bioética de la tecnología; cuyo orden transdisciplinar, evoluciona en cuestionamientos científicos basados en la evolución de la tecnociencia del siglo XXI. Se identificarán los referentes conceptuales de la relación entre transhumanismo ...

  14. La experiencia de los virus emergentes en el Caribe colombiano

    Directory of Open Access Journals (Sweden)

    Salim Máttar V

    2010-04-01

    Full Text Available Existe una interrelación muy estrecha entre el hombre, su ecología y el mundo microbiano, tanto el ser humano como los agentes infecciosos han coevolucionado durante milenios (1. La historia demuestra que ha existido una confluencia de diferentes enfermedades infecciosas y las principales civilizaciones. En los últimos años las enfermedades zoonoticas emergentes han ido cobrando una importancia creciente en el terreno de la salud humana y animal, surgiendo nuevas enfermedades procedentes siempre de lugares insospechados y causantes de graves problemas para el hombre o los animales (2. La mayoría de patógenos involucrados en las enfermedades infecciosas emergentes (EIE son de origen bacteriano o rickettsial (54.3%. En este grupo están incluidos los patógenos bacterianos resistentes a los antibióticos. Los patógenos de origen viral y los priones, constituyen el 25.4% de eventos de las EIE, los protozoarios representan el 10.7%, seguido de los hongos 6.3% y los helmintos en un 3.3%. El 60.3% de las enfermedades infecciosas emergentes son causadas por patógenos zoonoticos (2. El 71.8% de estas zoonosis son causados por patógenos que se originan de la fauna silvestre, como la emergencia del virus de Nipah en Malasia y el síndrome respiratorio agudo severo (SARS en China (3.

  15. una sociedad emergente

    Directory of Open Access Journals (Sweden)

    Derlisiret Rincón M.

    2006-01-01

    Full Text Available Este trabajo busca reflexionar por una parte acerca del papel de la ciencia, la tecnología y la educación, como factores de desarrollo de las naciones e intenta responder la interrogante en torno al cómo estas variables contribuirán a la transformación de la realidad social venezolana. Los planteamientos expuestos en este artículo forman parte de una investigación cualitativa que se sustenta en una revisión teórica cuyos resultados indican que existe la posibilidad cierta de construir y alcanzar una Venezuela virtual en los próximos años; es decir, se vislumbra un país interconectado y funcionando a través de redes cuyos individuos estarían capacitados y entrenados en el uso y usufructo de las nuevas tecnologías. Esta visión de país, se basa en la premisa de que la oportuna implementación de la Planificación de Ciencia y Tecnología resultaría instrumento de vinculación de las variables tecnológicas, educativas y científicas, que permiten obtener conocimientos especializados y orientados a la solución de problemas de creciente dimensión global. Tales conocimientos, pudieran generar los cambios sustanciales necesarios en el contexto nacional, para lograr modificar o disminuir el sentido de crecimiento de la brecha o divisoria digital en este entorno

  16. Justicia Restaurativa: Un paradigma emergente

    OpenAIRE

    García Gumbau, Erica

    2017-01-01

    RESUMEN DE LA TESIS DOCTORAL JUSTICIA RESTAURATIVA: UN PARADIGMA EMERGENTE La tesis profundiza y reflexiona en torno a una nueva concepción de la justicia y su aplicación en la praxis. Actualmente nos encontramos ante una crisis del paradigma retributivo o crisis del modelo de justicia tradicional, dominante hasta ahora en la administración de justicia. Paralelamente, se está empezando a hablar de una nueva filosofía de la administración de justicia. El presente trabajo de i...

  17. Sistema de prospecção de competências emergentes: proposta de modelo

    Directory of Open Access Journals (Sweden)

    Jair Cunha Cardoso Filho

    2016-08-01

    Full Text Available A questão do emprego e o desenvolvimento de competências emergentes apresentam-se como temas relevantes para a sociedade da informação e do conhecimento em uma economia globalizada e competitiva. Aborda-se o problema do apagão de mão de obra e as estratégias governamentais brasileiras e de organismos multilaterais de competências emergentes para mitigá-lo. Propõe-se, então, um modelo sistêmico de monitoramento ambiental para prospecção de competências emergentes, amparado nos paradigmas social e técnico-econômico da Ciência da Informação e baseado no monitoramento ambiental e na competência informacional. Portanto, além do conceito de competências emergentes, são abordados também os conceitos de competência informacional e monitoramento ambiental. Conclui-se, por fim, que tal modelo contribui para associar as ações de qualificação profissional aos esforços de desenvolvimento regional e de inclusão social, e que tanto o monitoramento ambiental de ambientes de negócio quanto a identificação de competências emergentes podem auxiliar na construção de estratégias organizacionais de longo prazo para o desenvolvimento do capital humano.

  18. The Differences between Emergentism & Skill Acquisition Theory

    Directory of Open Access Journals (Sweden)

    Naeemeh Kharaghani

    2017-01-01

    Full Text Available Although both emergentism and skill acquisition theory developed in the same field (cognitive theories and as an attempt to replace Universal grammar-based approaches, there are some differences between these two theories. The differences lie under their different models of knowledge representation and their diverse degree of emphasis on the role of input. In addition, skill acquisition considers the process of learning while emergentism considers input and output, and what goes on in between has not been considered. Finally it should be mentioned that these two theories take different views towards the learning process. 

  19. The humanist emergentism of Javier Monserrat

    Directory of Open Access Journals (Sweden)

    Carlos Beorlegui

    2016-02-01

    Full Text Available J. Monserrat is the most significant and consistent representative of the emergentist paradigm in our cultural context. He defends a humanist emergentism, which he has deepened from the level of neuronal engrams to later agree with the postulates on quantum neurology by Penrose and Hameroff. This article will present the main arguments supported by J. Monserrat, within the context of the ample paradigm of systemic emergentism. It will show how this paradigm allows him to defend a humanist and believing anthropological model in a more adequate way.

  20. Formas duradouras e formas emergentes de trabalho precário entre os jornalistas brasileiros

    Directory of Open Access Journals (Sweden)

    Jeferson Bertolini

    2015-08-01

    Full Text Available Este artigo busca dimensionar o conceito de trabalho precário entre os jornalistas brasileiros. O texto indica que a categoria sempre esteve exposta a formas precárias de trabalho, mas que o problema se agravou nos últimos 10 anos, com as tecnologias digitais: elas redefiniram o perfil do profissional e reordenaram o modelo de negócio das empresas do setor. O manuscrito, baseado em levantamento bibliográfico e experiência de campo, lista oito formas duradouras e oito formas emergentes de trabalho precário no jornalismo.

  1. soil algae

    African Journals Online (AJOL)

    Timothy Ademakinwa

    Also, the importance of algae in soil formation and soil fertility improvement cannot be over emphasized as the world is working ... farms further establishes the role of blue green algae in soil nutrients for plant growth. Key words- Soil Fertility, Soil ... with sunlight will promote the growth of soil algae and their contribution to ...

  2. PARADIGMAS EMERGENTES, CONHECIMENTO E MEIO AMBIENTE

    Directory of Open Access Journals (Sweden)

    Liane Keitel

    Full Text Available Este artigo tem por objetivo estimular o debate sobre novos modos de se compreender/ tratar o mundo com os recursos científico-epistêmicos. Para tal, o es tudo levanta e analisa novas formas de relacionamento científico com o mundo, com fundamento em paradigmas emergentes em ciências, tais como a teoria dos sistemas de Bertalanfy, a teoria de auto-organização de von Foerster, Ilya Prigogine, Henri Atlan e Edgar Morin, do acaso e necessidade de Monod, de autopoiese de Humberto Maturana e Francisco Varela, com suas emergentes possibilidades epistemológicas e também educacionais. Utiliza-se o método reconstrutivo, ou seja, colocam-se em diálogo teóricos e teorias diferentes que possam fornecer sustentação argumentativa para a tese central defendida.

  3. The Study of Algae

    Science.gov (United States)

    Rushforth, Samuel R.

    1977-01-01

    Included in this introduction to the study of algae are drawings of commonly encountered freshwater algae, a summary of the importance of algae, descriptions of the seven major groups of algae, and techniques for collection and study of algae. (CS)

  4. Revitalization of Emergentism in SLA: A Panacea!

    Directory of Open Access Journals (Sweden)

    Nima Shakouri Masouleh

    2012-09-01

    Full Text Available Emergentists claim learning takes place by extracting regularities from the input. By the same token, Ellis (1998 disputed the view held by generative linguistics that such a complex phenomenon as language can only be learnt if it is assumed that humans are endowed genetically with a language specific learning device. Emergentists, as O’Grady (2003 reports, claim simple learning mechanisms are sufficient to bring about the emergence of complex language representations. Nevertheless, this perspective toward learning has so far failed to take into account how language competence could emerge (O’Grady, 2003. The following paper is an attempt to elucidate the theoretical assumptions behind emergentism.

  5. Iniciativas emprendedoras de lucha contra problemas sociales: distintas aproximaciones geográficas

    OpenAIRE

    Fisac Garcia, Ramón; Alves de Carvalho, Nubia; Moreno Romero, Ana María; Moreno Mateos, Jaime; Rojas Lezana, Álvaro

    2012-01-01

    Esta comunicación, fruto de una investigación entre dos universidades, española y brasileña, presenta un análisis comparado de formas empresariales orientadas a la resolución de problemas sociales en diferentes partes del mundo: la empresa social en países emergentes de tradición anglosajona, la economía social en Europa y el emprendimiento social en América Latina.

  6. Algae Resources

    Energy Technology Data Exchange (ETDEWEB)

    None

    2016-06-01

    Algae are highly efficient at producing biomass, and they can be found all over the planet. Many use sunlight and nutrients to create biomass, which contain key components—including lipids, proteins, and carbohydrates— that can be converted and upgraded to a variety of biofuels and products. A functional algal biofuels production system requires resources such as suitable land and climate, sustainable management of water resources, a supplemental carbon dioxide (CO2) supply, and other nutrients (e.g., nitrogen and phosphorus). Algae can be an attractive feedstock for many locations in the United States because their diversity allows for highpotential biomass yields in a variety of climates and environments. Depending on the strain, algae can grow by using fresh, saline, or brackish water from surface water sources, groundwater, or seawater. Additionally, they can grow in water from second-use sources such as treated industrial wastewater; municipal, agricultural, or aquaculture wastewater; or produced water generated from oil and gas drilling operations.

  7. Migración y salud mental: un problema emergente de salud pública

    OpenAIRE

    Vilar Peyrí, Eugenia; Universidad Autónoma Metropolitana; Eibenschutz Hartman, Catalina; Universidad Autónoma Metropolitana

    2007-01-01

    La migración de grandes contingentes de habitantes del Sur hacia los países de altos ingresos se ha agudizado en la última década, como consecuencia de la polarización socioeconómica entre países y el empobrecimiento extremo al interior de los países del sur, ambas situaciones inducidas por las políticas neoliberales de la globalización. A pesar de ello, todavía son pocos los estudios sobre el impacto que estos fenómenos sociales tienen sobre la salud mental de los trabajadores que migran y l...

  8. Síndrome de Sensibilidad Múltiple a sustancias químicas: un problema ambiental emergente

    OpenAIRE

    E. Ordaz Castillo; F. Marqués Marqués

    2001-01-01

    El Síndrome de Sensibilidad Múltiple (SSM) es un conjunto de múltiples síntomas asociados producidos tras la exposición a agentes químicos a muy bajas concentraciones.Se han propuesto diferentes teorías para explicar sus causas, incluyendo alergia, efectos tóxicos y sensibilización neurobiológica. La evidencia científica es insuficiente para confirmar la relación entre las posibles causas y los síntomas. Los pacientes con SSM presentan depresión, ansiedad y trastornos somatoformes, pero no es...

  9. Niños dependientes de tecnología, un problema emergente de salud

    Directory of Open Access Journals (Sweden)

    Gerardo Rogelio Robaina Castellanos

    2012-09-01

    Full Text Available Desde hace varias décadas un número creciente de niños requiere de tecnologías para el mantenimiento de sus vidas. Estos niños dependientes de tecnología a menudo deben recibir cuidados de enfermería en sus propios hogares. El objetivo de este trabajo es realizar una revisión del tema. Se exponen en él algunas definiciones, clasificaciones y principios para la atención en el hogar a niños dependientes de tecnología, así como las habilidades y competencias a desarrollar por el personal de enfermería. Aunque estos niños constituyen un grupo minoritario de pacientes en Cuba, se necesita integrar, en un solo programa, su atención. El cuidado centrado en la familia, la adecuada coordinación entre los diferentes niveles de salud, la continuidad en los cuidados, y la accesibilidad de toda la población, son algunos de los principios básicos para la ejecución de un programa de atención; pero se requiere, además, del apoyo de todos los miembros de la sociedad.

  10. Competencia informacional y brecha digital: preguntas y problemas emergentes derivados de investigación

    Directory of Open Access Journals (Sweden)

    Gloria Patricia Marciales Vivas

    2012-04-01

    Full Text Available El artículo presenta resultados del estudio sobre el análisis de los cambios en las competencias informacionales vinculadas con el tránsito del formato impreso al digital en contextos universitarios. En el estudio fenomenográfico se analizan las trayectorias familiares y escolares y su relación con las prácticas de uso de fuentes de información en los dos formatos. Los resultados dan cuenta de las narraciones construidas por los jóvenes en sus historias familiares y escolares sobre las formas de acceder, evaluar y usar fuentes de información en contextos académicos.

  11. COMPETENCIA INFORMACIONAL Y BRECHA DIGITAL: PREGUNTAS Y PROBLEMAS EMERGENTES DERIVADOS DE INVESTIGACIÓN

    Directory of Open Access Journals (Sweden)

    Gloria Patricia Marciales Vivas

    2012-01-01

    Full Text Available El artículo presenta resultados del estudio sobre el análisis de los cambios en las competencias informacionales vinculadas con el tránsito del formato impreso al digital en contextos universitarios. En el estudio fenomenográfico se analizan las trayectorias familiares y escolares y su relación con las prácticas de uso de fuentes de información en los dos formatos. Los resultados dan cuenta de las narraciones construidas por los jóvenes en sus historias familiares y escolares sobre las formas de acceder, evaluar y usar fuentes de información en contextos académicos.

  12. Niños dependientes de tecnología, un problema emergente de salud

    OpenAIRE

    Gerardo Rogelio Robaina Castellanos; Solangel de la Caridad Riesgo Rodríguez

    2012-01-01

    Desde hace varias décadas un número creciente de niños requiere de tecnologías para el mantenimiento de sus vidas. Estos niños dependientes de tecnología a menudo deben recibir cuidados de enfermería en sus propios hogares. El objetivo de este trabajo es realizar una revisión del tema. Se exponen en él algunas definiciones, clasificaciones y principios para la atención en el hogar a niños dependientes de tecnología, así como las habilidades y competencias a desarrollar por el personal de enfe...

  13. ENFERMEDADES INFECCIOSAS EMERGENTES: EL TURNO DEL VIRUS DEL ZIKA

    Directory of Open Access Journals (Sweden)

    Carlos Arturo Álvarez Moreno

    2016-04-01

    ó y continúa siendo una causa frecuente de epidemias. En Suramérica, incluyendo Colombia, el último brote fue introducido en 1991.

    Más cerca, en 1918, la pandemia de la influenza (gripa española produjo solo en Estados Unidos 500.000 muertes y mucho más cerca, la pandemia de influenza por la A(H1N1 causó solo en el 2009 cerca de 500.000 muertes y aún sigue circulando, generando muertes adicionales (1. Si a esto le sumamos los casos de otras enfermedades emergentes como síndrome respiratorio agudo severo causados por coronavirus (SARS en el 2003 o MERS actualmente o el brote de fiebre amarilla (enfermedad reemergente ocurrido en el 2003-2004 en nuestro país, se puede decir que las enfermedades infecciosas, tanto las emergentes como las reemergentes, lejos de estar controladas, cada vez son un problema creciente de salud pública.

    1 Miembro Correspondiente. Academia Nacional de Medicina. Profesor Titular, Facultad de Medicina. Universidad Nacional de
    Colombia. Director General, Clínica Universitaria Colombia, Clínicas COLSANITAS S.A...

  14. Un concepto emergente de planeación

    Directory of Open Access Journals (Sweden)

    Jorge Sánchez Buitrago

    2014-01-01

    Full Text Available El propósito de este artículo es sustentar un concepto emergente de planeación derivado del desarrollo de la investigación titulada: “Hacia un paradigma emergente de la planeación: Resignificación desde las instituciones universitarias”. El principal objetivo es el de aportar en el sostenimiento de una racionalidad alternativa de la planeación, a partir de la lectura de algunos de los principales conceptos que están  determinando el salto paradigmático de la ciencia contemporánea. En este sentido se hace una valoración crítica de las actuales tensiones y agotamientos teóricos y prácticos de la planeación, como sustento para el establecimiento de bases conceptuales de nuevos procesos planeación.Generalmente las nuevas propuestas de planeación, en particular las del ámbito educativo y de los escenarios universitarios, se han gestado desde intencionalidades instrumentalistas y materializado en metodologías operativas que poco o nada se ocupan de hacer evidente su fundamentación conceptual; lo que conduce al planificador a un aprisionamiento epistemológico, por cuanto en ausencia de reflexiones teóricas sólidas es difícil superar los modelos de planeación cuando éstos se tornan obsoletos. Se espera que a partir de esta reflexión sobre la naturaleza de la planeación se generen procesos de transformación de prácticas de planeación en las organizaciones educativas, en especial en las universidades.Palabras Clave: Concepto de planeación; problemas de planeación; tipos de planeación; paradigma alternativo de planeación. An emerging concept of planningAbstractThis article briefly describes the discussion of an emerging concept for planning, which is derived from the research entitled “Towards an emerging paradigm in planning: re-conceptualization for higher education institutions. ” The main purpose is to supply the grounds for an alternative rationality in planning, taking into account some of the significant

  15. Empreendedor individual: uma modalidade de empreendedorismo emergente

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    Maria de Lourdes Prado

    2014-09-01

    Full Text Available O presente trabalho apresenta um estudo exploratório, com objetivo geral de identificar empreendedores individuais cadastrados na receita federal e os motivos que os levaram à sua formalização. Para isto foi realizada uma pesquisa bibliográfica utilizando conceitos e referências dos empreendedores e empreendedores individuais e os motivos que os levaram a formalização do seu negócio. O empreendedorismo no Brasil continua em curva ascendente inicialmente impulsionado pela abertura do mercado externo, bem como pela privatização das grandes companhias estatal, e atualmente influenciada pelo aquecimento da economia interna por meio da ascensão das classes C e D, e pela lei do empreendedor individual que possibilita importantes vantagens na formalização, o que contribuiu para a abertura de novas empresas fomentando o empreendedorismo por oportunidade, que atualmente apresenta dois negócios por oportunidade para cada empreendedor por necessidade. Neste contexto surge a modalidade emergente de empreendedores individuais. Atualmente há 56.957 empreendedores individuais no estado de Santa Catarina enquanto que no Brasil são mais de 1,4 milhão e para identificar sua caracterização e os motivos que o levaram a formalização foi elaborado um questionário com perguntas fechadas com abordagem qualitativa, tendo como resultado a identificação do perfil dos empreendedores individuais.

  16. promotora del alfabetismo emergente en el aula

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    Anayanci Vargas

    2007-01-01

    Full Text Available Con una prueba de evaluación de procesos lectores, se evaluó si el uso de estrategias de intervención sobre las habilidades subyacentes a la conciencia fonológica (CF en la etapa de alfabetismo emergente (preescolar, era suficiente para el afianzamiento de la CF como capacidad inherente a la comprensión de lectura en los grados de transición y primero de primaria; para ello se comparó el desempeño de dos grupos de niños por medio de cinco tareas de lectura. Los resultados de la prueba mostraron que los niños que habían recibido una de tres estrategias de intervención un año antes, tuvieron un desempeño mejor en las tareas de comprensión lectora; cabe resaltar que tal refuerzo se desarrolló en un período corto de tiempo, por lo que se espera que si se aplica una intervención más prolongada se presentarán diferencias más contundentes entre los niños de ambos grupos.

  17. Las Enfermedades Infecciosas emergentes y la Salud Pública

    Directory of Open Access Journals (Sweden)

    Fabio Aurelio Rivas Muñoz

    1997-06-01

    Full Text Available

    El optimismo de hace unos años con respecto al control definitivo de las enfermedades infecciosas ha venido diluyéndose poco a poco. Hoy en día, estas entidades nos atacan por múltiples frentes y, en conjunto, representan la principal causa de muerte a escala mundial. En 1995 17 millones de personas, incluidos 9 millones de niños, murieron por infecciones prevenibles como diarreas y neumonías. Los antibióticos, considerados hasta hace poco tiempo la solución al problema de las infecciones, son cada vez menos eficaces en la medida en que se incrementa el número de cepas resistentes y la velocidad con que éstas desarrollan dicha resistencia.

    Si a este hecho agregamos el evidente deterioro de las condiciones de vida de la población y el que ha sufrido la salud pública en particular, a consecuencia del desigual impulso a la más rentable atención de la enfermedad individual, la facilidad y rapidez con que se viaja de uno a otro continente o de una a otra región dentro de un país, la urbanización desordenada e incontrolada de las ciudades, la crisis económica mundial, los daños al ambiente, etc., todas condiciones que, en general, favorecen la aparición de “”nuevas” infecciones, puede entonces comprenderse la magnitud del desafío.

    Algunas de las enfermedades infecciosas emergentes, esto es, aquellas cuya incidencia en el Ser Humano ha aumentado durante los dos últimos decenios o amenaza con aumentar en el futuro próximo, han surgido a consecuencia de la evolución de microorganismos ya existentes como la tuberculosis o el cólera. Otras, quizás las menos, son ocasionadas por agentes hasta hace poco desconocidos (nuevos, varios de gran patogenecidad, como el virus de Ebola o Hantavirus que llevan a severas neumonías con letalidad del 50%.

    En las Américas, entre 1991 y 1995 se notificaron más de 1 millón de casos de cólera y 9 mil muertes. La OPS estima en 10 años y en más de 200.000 millones de

  18. Problemas de conexiones ortogonales

    OpenAIRE

    Portillo Fernández, José Ramón

    2002-01-01

    El área de investigación sobre dibujos de grafos constituye una importante conexión entre diversos campos de la Matemática, tales como la algorítmica, la geometría computacional y la teoria topológica de grafos. Dentro de ella, el estudio de las inmersiones ortogonales ocupa un lugar importante por su aplicación a diversos problemas: dise&nti lde;o de circuitos VLSI, donde da lugar a diversos problemas de optimización, creación de diagramas de flujo y organigramas, diseño de bases de datos en...

  19. Un concepto emergente de planeación

    OpenAIRE

    Jorge Sánchez Buitrago

    2014-01-01

    El propósito de este artículo es sustentar un concepto emergente de planeación derivado del desarrollo de la investigación titulada: “Hacia un paradigma emergente de la planeación: Resignificación desde las instituciones universitarias”. El principal objetivo es el de aportar en el sostenimiento de una racionalidad alternativa de la planeación, a partir de la lectura de algunos de los principales conceptos que están  determinando el salto paradigmático de la ciencia contemporánea. En este sen...

  20. Leptospirosis: Enfermedad Zoonótica Emergente

    Directory of Open Access Journals (Sweden)

    Manuel Céspedes Z

    2005-10-01

    Full Text Available La leptospirosis es un problema de salud pública a nivel mundial, en particular en áreas tropicales y subtropicales y en países en vías de desarrollo. La magnitud del problema es atribuido a las condiciones climáticas y ambientales, pero también al contacto que se tiene con ambientes contaminados por Leptospira, esto se observa en las actividades agrícolas, ganadera, minera, recreacionales, deportivas y condiciones de salubridad en la vivienda. Es una enfermedad potencialmente mortal pero tratable; su espectro clínico va desde la enfermedad asintomático, síntomas mínimos similares a un resfrió común, hepatitis, dengue clásico o pueden ser graves como las fiebres hemorrágicas virales y meningitis. Al ser frecuente en zonas tropicales donde confluyen otras infecciones como el dengue, tienden a confundirse sus cuadros clínicos, siendo generalmente subdiagnósticada, sin embargo estudios recientes han demostrado su importancia en la salud pública. Los nuevos y menos complicados métodos de diagnóstico se han desarrollado en años recientes, permitiendo que la infección sea identificada en campo sin la necesidad de tener laboratorios tan sofisticados. La falta de disponibilidad de una vacuna que proteja contra todos los serovares de leptospiras hace que la prevención hasta ahora dependa de la implantación de medidas de saneamiento. En esta revisión se brinda información sobre aspectos relacionados a la bacteria, epidemiología, reservorios, transmisión, patogenia, clínica, diagnóstico y manejo de la leptospirosis.

  1. Criptosporidiosis: una zoonosis emergente Cryptosporidiosis: an emerging zoonosis

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    V. F. Del Coco

    2009-09-01

    Full Text Available El género Cryptosporidium, responsable de la criptosporidiosis, abarca diversas especies. El ganado vacuno y el hombre constituyen las principales fuentes de infección. Los brotes de criptosporidiosis están asociados al agua de consumo, por ser el ooquiste -la forma infectante del parásito- resistente a los tratamientos convencionales de potabilización. En individuos inmunocompetentes es causa de diarrea aguda, normalmente autolimitada. En pacientes inmunocomprometidos la enfermedad puede adquirir formas graves, potencialmente fatales. Las personas afectadas por el síndrome de inmunodeficiencia adquirida son particularmente propensas a padecer formas graves de criptosporidiosis. En terneros, las infecciones por Cryptosporidium son consideradas un factor de morbimortalidad y conducen a grandes pérdidas económicas. En los últimos años, el incremento del número de pacientes con distintas causas de inmunosupresión ha aumentado la necesidad de encontrar un tratamiento efectivo para la infección por Cryptosporidium. A pesar de los numerosos intentos de la industria farmacéutica de desarrollar un antiparasitario efectivo, la infección gastrointestinal por Cryptosporidium y sus consecuencias clínicas continúan siendo un importante problema en materia de salud pública. En la presente actualización se analiza la taxonomía, la morfología, la biología y el ciclo evolutivo de Cryptosporidium, así como también los aspectos clínicos, inmunológicos, diagnósticos y epidemiológicos de la criptosporidiosis. Se discute el tratamiento y la profilaxis de esta afección y se sugieren pautas tendientes a lograr un control más adecuado de esta parasitosis emergente.The genus Cryptosporidium, responsible for producing cryptosporidiosis, includes several species. Humans and livestock are the main sources of infection. Waterborne cryptosporidiosis outbreaks are associated with drinking water. The infective parasite stage is the oocyst, which is

  2. Doenças infecciosas emergentes e reemergentes

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    Marcos Vinicius da Silva

    2007-05-01

    Full Text Available Nos últimos anos tem sido observada a explosão mundial de doenças infecciosas emergentes como a síndrome de imunodeficiência adquirida (Aids e a síndrome pulmonar por hantavírus (SPHV, além de velhas e reemergentes doenças como a tuberculose, a cólera, a difteria, a peste, a febre amarela, a dengue e a malária. Essas doenças infecciosas emergentes surgiram recentemente numa população ou, já existiam, mas sofreram rápido aumento na incidência ou na extensão geográfica e acometem tanto aos humanos como aos animais.

  3. Infraclases rurales: procesos emergentes de exclusión social en España

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    SIMÓN PEDRO IZCARA PALACIOS

    2002-01-01

    Full Text Available Desde comienzos de los ochenta el discurso sociológico sobre la pobreza ha sufrido un proceso de desruralización, quedando dominado por el concepto de "infraclase". Éste se ha constituido en el término explicativo de un tipo particular de pobreza enraizada en un problema dual de marginalidad económica y aislamiento social en áreas urbanas espacialmente concentradas. En las áreas rurales, este tipo de dislocaciones sociales han permanecido veladas, haciendo que la noción de pobreza rural haya quedado relegada a un segundo plano. Sin embargo, los trazos más destacados de los "infraclase" (desempleo de larga duración, trabajo no cualificado en empleos erráticos, asilamiento social y dependencia de prestaciones sociales son especialmente relevantes para el análisis de los procesos de exclusión social en el medio rural español. Este artículo examina la emergencia de un colectivo "infraclase" en la España rural. Los nuevos procesos emergentes de exclusión social en el medio rural español estarían relacionados con el desempleo agrario en la España meridional y el uso de mano de obra inmigrante ilegal en la agricultura del litoral mediterráneo.

  4. El riesgo asegurable y los riesgos emergentes de las nuevas tecnologías

    Directory of Open Access Journals (Sweden)

    Hilda Esperanza Zornosa Prieto

    2009-12-01

    Full Text Available Este documento analiza los retos que imponen al sector asegurador tradicional los riesgos emergentes de la era tecnológica, con especial referencia a los daños causados al medio ambiente y los daños ecológicos en general, sobre los que no existe aún, por tratarse de conceptos relativamente nuevos, información estadística que permita la medición de su frecuencia y severidad y, en consecuencia, la determinación del monto de una prima ajustada al riesgo; lo cual se constituye, de hecho, en el factor diferencial entre el concepto general de riesgo asegurable y el concepto que sobre éste se tiene en el seguro de contaminación, pues si bien estos conceptos no difieren en general, es innegable que el último versa sobre un riesgo extraordinario o catastrófico, que conduce a aquella imposibilidad de aplicar técnicas actuariales y mediciones estadísticas; todo lo cual lleva a sostener que el seguro y la responsabilidad civil no pueden, por sí solos, solucionar los problemas que plantean los riesgos de la era tecnológica, lo que hace necesaria la intervención activa del Estado.

  5. Zoonosis emergentes y reemergentes y principios básicos de control de zoonosis

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    Ricardo León Vega Aragón

    2009-06-01

    Full Text Available Diferentes factores hacen que las enfermedades compartidas por los animales y el hombre estén hoy en aumento no sólo desde el punto número de patologías zoonóticas compartidas, sino que las reconocidas como tal presenten mayor difusión. La tendencia es que este problema crecerá. Entre las causas que favorecen su crecimiento está el cambio climático y la mayor difusión, especialmente de las enfermedades trasmitidas por vectores. Además, la intromisión del hombre en los nichos de las zoonosis de foco natural también incide, al igual que la gran movilidad del hombre y los animales, de los productos de éstos y sus derivados. También algunos agentes zoéticos se han adaptado y modificado y se han convertido en zoonóticos; otros, incluso, ya no necesitan el reservorio animal para su presentación en el hombre. Entre estas zoonosis, cumplen un papel importante las denominadas emergentes, que aparentan ser “zoonosis nuevas”; algunas que ya el hombre consideraba bajo control, están recrudeciéndose como “reemergentes”. Es importante, por tanto, revisar los conceptos básicos de control de zoonosis para generar políticas gubernamentales que lleven a controlarlas y eliminarlas.

  6. Acumulación de reservas internacionales en economías emergentes

    Directory of Open Access Journals (Sweden)

    De Gregorio José

    2011-12-01

    Full Text Available Este documento analiza la racionalidad de mantener reservas internacionales, las cuales se usan como un tipo de seguro ante problemas de financiamiento externo y para intervenir en el tipo de cambio. Aquí se argumenta que no es posible separar ambos objetivos. Esto explica por qué el empleo de otras formas de seguro, aunque potencialmente más baratos, no son generalizadas. Por otra parte, el hecho de que en la práctica la utilización de las reservas internacionales sea muy baja, incluso en períodos de crisis, es evidencia de que tienen un rol disuasivo –el solo hecho de mantenerlas reduce la vulnerabilidad financiera. La evidencia para la crisis subprime se estudia, encontrando que las tensiones financieras fueron menores en economías con altos niveles de reservas. Finalmente, se discuten diversas formas de medir el nivel adecuado de reservas y se examinan las variaciones de reservas y del tipo de cambio durante las crisis asiática y subprime en economías emergentes.

  7. Enfermedades infecciosas emergentes y reemergentes: problemática actual

    OpenAIRE

    Viviente López, Enrique

    2008-01-01

    Entendemos por enfermedades emergentes aquellas enfermedades infecciosas nuevas o reemergentes cuya incidencia se ha incrementado en las dos o tres últimas décadas o que tienen tendencia a incrementarse en un futuro próximo. Es decir, enfermedades desconocidas hasta ahora o bien aquellas que existiendo previamente incrementan su incidencia o distribución. Ahora bien, al hablar de una enfermedad nueva hemos de distinguir si efectivamente estamos en presencia de un nuevo germen patógeno, surgid...

  8. On Major Perspectives on Language Acquisition: Nativism, Connectionism, and Emergentism

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    Mohammad Khatib

    2015-03-01

    Full Text Available The phenomenon of language acquisition is a controversial issue within the field of language-related studies. Different approaches have been proposed to take account of this complicated matter. The present paper attempts at reviewing the current cognitive perspectives on language acquisition, i.e., Connectionism and Emergentism and exploring to what extent they are different from Nativism.

  9. Magnetic separation of algae

    Science.gov (United States)

    Nath, Pulak; Twary, Scott N.

    2016-04-26

    Described herein are methods and systems for harvesting, collecting, separating and/or dewatering algae using iron based salts combined with a magnetic field gradient to separate algae from an aqueous solution.

  10. Solidaridad como problema

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    José Antonio Román

    2007-01-01

    Full Text Available El artículo aborda la solidaridad como un vocablo de importante protagonismo cultural en nuestro país, tal que es empleado cotidiana - mente para resolver gran variedad de situaciones en que es necesario concitar la ayuda, como re - ferente para la evaluación de la calidad moral de una acción, persona o colectivo, y hasta ha lle - gado a establecerse un mes de la solidaridad. Sin embargo, esta relevancia no ha sido acompañada de una línea correlativa en investigación social. En este contexto, el artículo se propone proble - matizar la noción de solidaridad, de tal forma de dejar de pensarla como dato, y poder comenzar su reflexión como un problema de estudio en la investigación social nacional.

  11. Enfermedades emergentes y reemergentes: factores causales y vigilancia

    OpenAIRE

    Carmen Luisa Suárez Larreinaga; Denis Berdasquera Corcho

    2000-01-01

    Este artículo tiene como objetivo exponer los conceptos y algunos de los factores causales más importantes en la aparición y diseminación de las enfermedades emergentes y reemergentes, así como presentar brevemente algunas de las actividades de vigilancia epidemiológica y su importancia en la detección y control de estas enfermedadesThe objective of this paper is to expound the concepts and some of the most important causal factors in the appearance and spreading of emergent and reemergent di...

  12. La diversidad como problema

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    Jordi Garreta i Bochaca

    2013-05-01

    Full Text Available La diversidad cultural es uno de las trazos definitorios de nuestra socie-dad. En un contexto, en el que la diversidad -resultado de !as migraciones- se va incre-mentando hay que plantearse una serie de adaptaciones mutuas, más allá de la asimila-ción. La escuela, institución reflejo de las ideologías dominantes en este sentido, debería tomar en consideración esta diversidad y convertirla en riqueza más que en un problema. Fijándonos en la experiencia del Quebec y otras sociedades que han recibido durante muchos años inmigrantes, consideramos interesante tener en cuenta su experiencia y, por ejemplo, revisar a fondo el material escolar, desarrollar la figura del mediador (un profe-sional que puede incrementar la comunicación entre centro y familia, relación que se ve influenciada por barreras lingüísticas, socioeconómicas, culturales e institucionales; etc = The cultural diversity is one of the linea of definition of our society. !n a context, in the one that the diversity -for the migrations- it leaves increasing it is necessary to think about mutual adaptations, beyond the assimilation. The school, reflective institu-tian of the dominant ideologies in this sense, it should take in consideration this diversity and to transform it finto wealth more than in a problem. Noticing the experience of the Quebec and other societies that have received during many years immigrants, considera interesting to keep in mind their experience and, for example, to thoroughly revise the school material, to develop the mediator's figure (a professional that it can increase the communication among centre and family, relationship that is influenced by linguistic, socio-economic, cultural and institutional differences; etc

  13. Plasmodesmata of brown algae

    OpenAIRE

    Terauchi, Makoto; Nagasato, Chikako; Motomura, Taizo

    2014-01-01

    Plasmodesmata (PD) are intercellular connections in plants which play roles in various developmental processes. They are also found in brown algae, a group of eukaryotes possessing complex multicellularity, as well as green plants. Recently, we conducted an ultrastructural study of PD in several species of brown algae. PD in brown algae are commonly straight plasma membrane-lined channels with a diameter of 10?20?nm and they lack desmotubule in contrast to green plants. Moreover, branched PD ...

  14. Educabilidad y problemas de aprendizaje

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    Jorge Capella Riera

    1993-12-01

    Full Text Available En el presente artículo voy a intentar responder al pedido de algunos colegas de desarrollar esas ideas a fin de contribuir al estudio de un problema que, por su magnitud y proyección, está causando preocupación entre educadores y psicólogos. Y al hacerlo parto de la idea de que los problemas, no importa de qué índole sean, no pueden resolverse aisladamente. Su interconexión e interdependencia respecto a otros problemas reclaman una visión deconjunto y una gran apertura a la contrastación teórica.

  15. MICROCONTAMINANTES EMERGENTES EN AGUAS: TIPOS Y SISTEMAS DE TRATAMIENTO

    Directory of Open Access Journals (Sweden)

    Yolanda Patiño

    2014-01-01

    Full Text Available En el presente artículo se revisan las distintas clases de contaminantes emergentes, su origen y uso, y su presencia en las cuencas españolas, tanto en aguas superficiales como subterráneas. Los microcontaminantes emergentes son compuestos de distinto origen y naturaleza que hasta ahora habían pasado inadvertidos debido a su baja concentración (en el orden de las ppb y sobre los que no hay regulación específica. Están divididos en seis grandes grupos y muchos de ellos se comportan como disruptores endocrinos, provocando efectos negativos sobre la salud humana y el medio ambiente. Se encuentran presentes en las aguas ya que las plantas de tratamiento de aguas residuales no están diseñadas para su eliminación, por lo que están siendo vertidos. Se discuten las distintas alternativas para su eliminación – tratamiento físico-químicos, biológicos y tecnologías híbridas - , destacando dentro de los procesos físico-químicos el empleo de procesos avanzados de oxidación (AOPs que están resultando muy prometedores.

  16. FITOTOXICIDADE DE HERBICIDAS PRÉ EMERGENTES EM MUDAS CLONAIS DE EUCALIPTO

    Directory of Open Access Journals (Sweden)

    Ivan da Costa Ilhéu Fontan

    2016-12-01

    Full Text Available O objetivo deste estudo foi avaliar a fitotoxicidade de herbicidas pré emergentes sobre mudas de Eucalyptus urophylla, de modo a subsidiar recomendações de uso em condições de campo. O trabalho foi conduzido em viveiro de eucalipto localizado em Curvelo/MG, utilizando-se os herbicidas pré emergentes isoxaflutole, flumioxazin, sulfentrazone e clomazone + carfentrazone-ethyl, simulando uma taxa de 200 l/ha de calda. O experimento foi estabelecido em um delineamento inteiramente casualizado, com 15 repetições. A sensibilidade dos clones foi avaliada por meio da incidência e da severidade dos sintomas de intoxicação foliar nas mudas, verificadas um, cinco e dez dias após a aplicação. Os herbicidas isoxaflutole e flumioxazin não provocaram reações adversas às mudas, permitindo sua utilização sobre as plantas. Já a pulverização de sulfentrazone e clomazone + carfentrazone-ethyl provocou a manifestação de sintomas de fitotoxicidade (manchas foliares e murcha apical, e desta forma, sua aplicação não é recomendada sobre as mudas, e seu uso deve ser limitado entre as atividades de preparo de solo e plantio.

  17. Ferropenia: Un problema ignorado

    Directory of Open Access Journals (Sweden)

    Carlos Coronel Carbajal

    2001-03-01

    Full Text Available La deficiencia de hierro es la carencia nutricional más extendida en el mundo, con serias implicaciones para la salud. Se realizó un estudio descriptivo en una muestra de 160 pacientes, con niveles séricos de hierro por debajo de 10 mmol/L, en el Hospital General Docente «Armando Enrique Cardoso», en el período comprendido entre enero y diciembre de 1999. Los objetivos de la investigación fueron identificar el grupo etáreo afectado por este estado carencial, así como sus principales causas, manifestaciones clínicas y la relación de dicho estado con la hemoglobina y el estado nutricional. Los principales resultados fueron una afectación del 59,4 % en el grupo de 0 a 1 año; la causa más frecuente fue la ingestión de leche de vaca en el 43,1 % de los casos y la inapetencia fue la manifestación que estuvo presente en el mayor número de pacientes. Se concluye que la ferropenia es un problema frecuente, que en ocasiones es ignorado, y para su prevención se deben cumplir algunas pautas, como es la suplementación precoz con hierro exógeno en dosis bajas.Iron deficiency is the most disseminated nutritional deficiency in the world and it has serious implications for health. A descriptive study was conducted in a sample of 160 patients with serum iron levels under 10 mmol/L, at "Armando Enrique Cardoso" General Teaching Hospital from January to December, 1999. The objectives of the investigation were to identify the age group affected by this deficiency state, as well as its main causes, clinical manifestations and the relationship of such state with haemoglobin and the nutrional status. The main results were as follows: 59.4 % were affected in the group aged 0-1, the most frequent cause was the ingestion of cow milk in 43.1 % of the cases and the lack of appetite was the manifestation observed in most of the patients. It was concluded that iron deficiency is a common problem that some times is ignored and that some indications as the

  18. La ley de educación superior argentina: emergente de la realidad social e instrumento para solucionar problemas sociales

    OpenAIRE

    Iriarte, Alicia A.; Ferrazzino, Ana

    2012-01-01

    En el contexto de países Latinoamericanos, donde la marginalidad transversaliza sus sistemas de educación, ya sea de modo incidental, circunstancial o como resultante de procesos sociales, la educación puede constituirse en un instrumento de equilibrio dentro de la sociedad o, contrariamente, promover la discriminación y la exclusión educativa y social. El espacio universitario actúa como un espacio de tensiones en que se manifiestan y exteriorizan asimetrías y desigualdades sociales. Así,...

  19. [Harmful algae and health].

    Science.gov (United States)

    Kankaanpää, Harri T

    2011-01-01

    Harmful algae are a worldwide problem. Phycotoxins is a general term for toxic compounds produced by harmful species of the phytoplankton. This review deals with the occurrence of harmful algae and phycotoxins in the Baltic Sea and other domestic waters, the ways of getting exposed to them, and their effects. Advice on how to avoid the exposure is provided.

  20. Algae Derived Biofuel

    Energy Technology Data Exchange (ETDEWEB)

    Jahan, Kauser [Rowan Univ., Glassboro, NJ (United States)

    2015-03-31

    One of the most promising fuel alternatives is algae biodiesel. Algae reproduce quickly, produce oils more efficiently than crop plants, and require relatively few nutrients for growth. These nutrients can potentially be derived from inexpensive waste sources such as flue gas and wastewater, providing a mutual benefit of helping to mitigate carbon dioxide waste. Algae can also be grown on land unsuitable for agricultural purposes, eliminating competition with food sources. This project focused on cultivating select algae species under various environmental conditions to optimize oil yield. Membrane studies were also conducted to transfer carbon di-oxide more efficiently. An LCA study was also conducted to investigate the energy intensive steps in algae cultivation.

  1. Enfermedades emergentes y reemergentes: factores causales y vigilancia

    Directory of Open Access Journals (Sweden)

    Carmen Luisa Suárez Larreinaga

    2000-12-01

    Full Text Available Este artículo tiene como objetivo exponer los conceptos y algunos de los factores causales más importantes en la aparición y diseminación de las enfermedades emergentes y reemergentes, así como presentar brevemente algunas de las actividades de vigilancia epidemiológica y su importancia en la detección y control de estas enfermedadesThe objective of this paper is to expound the concepts and some of the most important causal factors in the appearance and spreading of emergent and reemergent diseases, as well as to make a brief presentation of some of the epidemiological surveillance activities and their importance in the detection and control of these diseases

  2. Estrategias de aprendizaje emergentes en la modalidad e-learning

    Directory of Open Access Journals (Sweden)

    Luis Demetrio Meza-López

    2016-01-01

    Full Text Available El objetivo de esta investigación fue sistematizar las estrategias de aprendizaje que implementa el alumno de la modalidad e-learning. La problemática fue abordada desde una perspectiva cualitativa utilizando el método de la teoría fundamentada y la técnica de entrevista en profundidad. Se diseñó una plataforma tecnológica propia para realizar el trabajo de campo con entrevistas online, procesando los videos con un software de análisis cualitativo. La validez y confiabilidad de las categorías emergentes fue verificada mediante la saturación de los datos y trianguladas con un constructo teórico propio elaborado con referentes de Weinstein y Meyer (1998, Pintrich, García y Mckeachie (1991 y Tsai (2009. Los resultados muestran que hay una dimensión de estrategias de aprendizaje en la modalidad e-learning en donde el factor de gestión tiene gran influencia para regular el proceso sobre todo en el uso del tiempo y la administración de las estrategias. El factor de autorregulación considerando la metacognición y la adaptabilidad juegan un papel esencial, al igual que el factor sicológico de la motivación y la concentración, aunado al factor de usos de la tecnología en la selección y utilización de los medios tecnológicos. El aporte devela la forma con la que se adaptan estrategias emergentes de aprendizaje en la educación virtual en México y la posibilidad de que se conviertan en líneas de investigación para el contexto de América Latina.

  3. Canabinoides sintéticos: drogas de abuso emergentes

    Directory of Open Access Journals (Sweden)

    Audrei de Oliveira Alves

    2012-01-01

    Full Text Available CONTEXTO: A Cannabis sativa (cannabis, maconha, marijuana é uma droga de abuso com efeitos psicoativos e potencial terapêutico bastante conhecidos. Um grande número de canabinoides foi sintetizado na tentativa de excluir ou minimizar os efeitos psicotrópicos e mantendo as aplicações terapêuticas. Os canabinoides sintéticos representam o mais recente avanço das designer drugs. OBJETIVOS: Este trabalho busca trazer informações sobre a utilização de canabinoides sintéticos como drogas de abuso emergentes, principalmente sob a forma de spice ou herbal blends. MÉTODOS: Foi realizada uma pesquisa bibliográfica na base de dados PubMed utilizando os descritores de assunto "synthetic cannabinoids", "spice", "legal highs", "herbal blends", "psychosis cannabis" e suas combinações. RESULTADOS: Foram encontrados canabinoides sintéticos nos produtos Spice, confirmando que os incensos herbais realmente surgiram como drogas de abuso emergentes. CONCLUSÃO: Não está claro se a utilização de canabinoides sintéticos e de Spice é uma moda passageira ou se irá se estabelecer em nossa sociedade. No entanto, o fenômeno das designer drugs, especialmente canabinoides sintéticos, representa um desafio presente para o sistemas de saúde no mundo globalizado, tornando-se necessária a pesquisa clínica e forense desses produtos.

  4. Blue-Green Algae

    Science.gov (United States)

    ... people with hepatitis C or hepatitis B. HIV/AIDS. Research on the effects of blue-green algae in people with HIV/AIDS has been inconsistent. Some early research shows that taking 5 grams of blue-green ...

  5. Enfermedades infecciosas emergentes: interacción entre el mundo microbiano y las sociedades humanas

    OpenAIRE

    Fernando García

    2008-01-01

    En este artículo se analizan dos facetas importantes de las enfermedades infecciosas emergentes. Por un lado, las características de los microorganismos que las causan, por otro, las características del ser humano que promueven o contribuyen al surgimiento de las enfermedades infecciosas. Desde el punto de vista microbiano, se pueden identificar tres aspectos fundamentales. Primero, los patógenos emergentes son predominantemente virales, seguidos por los bacterianos. Numéricamente los virus A...

  6. Biofuels and algae

    International Nuclear Information System (INIS)

    Anon.

    2011-01-01

    Bio-fuels based on micro-algae are promising, their licensing for being used in plane fuels in a mix containing 50% of fossil kerosene is expected in the coming months. In United-States research on bio-fuels has been made more important since 2006 when 2 policies were launched: 'Advanced energy initiative' and 'Twenty-in-ten', the latter aiming to develop alternative fuels. In Europe less investment has been made concerning micro-algae fuels but research programs were launched in Spain, United-Kingdom and France. In France 3 important projects were launched: SHAMASH (2006-2010) whose aim is to produce lipidic fuels from micro-algae, ALGOHUB (2008-2013) whose aim is to use micro-algae as a raw material for humane and animal food, medicine and cosmetics, SYMBIOSE (2009-2011) whose aim is the optimization of the production of methane through the anaerobic digestion of micro-algae, SALINALGUE (2010-2016) whose aim is to grow micro-algae for the production of bio-energies and bio-products. (A.C.)

  7. Caracterización genotípica y fenotípica de cepas emergentes de Escherichia coli aisladas de niños con diarrea en Bucaramanga y su área metropolitana, Colombia

    Directory of Open Access Journals (Sweden)

    Monica Yurley Arias Guerrero

    2016-06-01

    Full Text Available Introducción: La enfermedad diarreica aguda (EDA sigue siendo uno de los principales problemas en salud pública en países en desarrollo. Dentro de los agentes infecciosos que causan esta enfermedad se encuentran bacterias, virus y parásitos. Los agentes bacterianos ocupan un segundo lugar destacándose Escherichia coli enteropatógenas entre las más importantes. Actualmente, seis cepas con diferentes mecanismos de patogenicidad están asociados a diarrea  E. coli enteropatógena (ECEP, productora de toxina-shiga (ECTS, enterotoxigénica (ECET, enteroinvasiva (ECEI, enteroagregativa (ECEA y adherente difusa (ECAD, cada una con un set específico de genes de virulencia. No obstante, se han reportado brotes de EDA ocasionados por cepas de E. coli diferentes a los patotipos conocidos, denominadas cepas emergentes. Estos brotes han sido reportados en Alemania, Europa y recientemente en Cartagena Colombia, lo que sugiere que en nuestro medio circulan estas cepas. Por lo cual, es necesario caracterizar estas cepas emergentes. Objetivo: Caracterizar genotípicamente y fenotípicamente dos cepas emergentes de E. coli aisladas de muestras diarreicas en niños menores de cinco años en Bucaramanga, Colombia. Materiales y métodos: De un estudio de casos y controles realizado entre Julio del 2013 y diciembre del 2014 en Bucaramanga y su área metropolitana, Colombia a 860 niños menores de 5 años con diarrea (casos y sin diarrea (controles. Se aislaron a partir de coprocultivos cepas de E. coli mediante pruebas bioquímicas. A estas cepas previamente almacenadas a -80°C se les determino mediante PCR multiplex los patotipos de E. coli, los cuales posteriormente fueron confirmados mediante PCR simple. Muestras positivas para dos patotipos u otra característica fueron clasificadas como cepas emergentes. Finalmente, estas cepas se caracterizaron fenotípica y genotípicamente. Para ello, se llevaron a cabo pruebas como secuenciación de genes de

  8. Anticoagulant effect of marine algae.

    Science.gov (United States)

    Kim, Se-Kwon; Wijesekara, Isuru

    2011-01-01

    Recently, a great deal of interest has been developed in the nutraceutical and pharmaceutical industries to isolate natural anticoagulant compounds from marine resources. Among marine resources, marine algae are valuable sources of novel bioactive compounds with anticoagulant effect. Phlorotannins and sulfated polysaccharides such as fucoidans in brown algae, carrageenans in red algae, and ulvans in green algae have been recognized as potential anticoagulant agents. Therefore, marine algae-derived phlorotannins and SPs have great potential for developing as anticoagulant drugs in nutraceutical and pharmaceutical areas. This chapter focuses on the potential anticoagulant agents in marine algae and presents an overview of their anticoagulant effect. Copyright © 2011 Elsevier Inc. All rights reserved.

  9. Sociedad y posibilidades tecnológicas emergentes

    Directory of Open Access Journals (Sweden)

    Chaparro Mendivelso Jeffer

    2004-01-01

    Full Text Available Las nuevas tecnologías de la información y la comunicación ”NTIC” están generando cambios trascendentales en la sociedad y el territorio. Se están imbricando diferencialmente en todas las actividades de la vida humana, mediando desde los flujos económicos globales hasta las relaciones personales individuales. Paralelamente se están propiciando profundas alteraciones en términos de la concepción del mundo y del lugar, de lo material y lo inmaterial, de lo real y lo virtual, de lo utópico y lo imaginario, de lo orgánico y lo artificial. Emergen nociones y conceptos diversos perocomplementarios que van desde la idea de ciberespacio hasta la de Internet como un "actante" con propiedades emergentes inquietantes, pasando por la inteligencia colectiva en red y los cyborg como nuevo estadio del devenir humano. Las implicaciones derivadas de las NTIC se perfilan como una línea interesante "y poco exploradas" de trabajo e investigación en geografía ya que, evidentemente, losprocesos y las dinámicas socioterritoriales cada vez se median más por lo digital.

  10. Movimientos sociales emergentes y nuevas maneras de educar

    Directory of Open Access Journals (Sweden)

    Elsie Rockwell

    2012-09-01

    Full Text Available El objetivo de este artículo es argumentar que los movimientos sociales recientes nos obligan a tomar en serio tanto la profunda desigualdad social, como la diversidad cultural y social generada por recientes cambios en la economía y por proyectos alternativos de vida y formación. Sobre el trasfondo de la formación histórica de la clase trabajadora, un tema recurrente ha sido la esperanza de transformar la sociedad mediante la formación del "hombre nuevo". Sin embargo, la economía capitalista global reciente ha generado una clase trabajadora cada vez más fragmentada y desposeída. En respuesta, se forman nuevos sujetos sociales que retoman recursos y prácticas culturales existentes para fortalecer los movimientos sociales emergentes. Concluyo que el reconocimiento de estos movimientos sociales y procesos de formación ha transformado el pensamiento Iluminista, dando lugar a otras maneras de pensar y actuar en los procesos educativos.

  11. A influência das economias emergentes em assuntos internacionais

    Directory of Open Access Journals (Sweden)

    Nubia Nieto

    2012-08-01

    Full Text Available Este artigo examina o impacto das economias emergentes nos assuntos internacionais. A chegada dos países do Bric (Brasil, Rússia, Índia e China modificou o mapa da ordem mundial e as estratégias para projetar poder hegemônico. O Bric eclipsará o poder econômico dos países mais ricos do mundo? Quais são as principais estratégias do Bric para projetar seu poder no mundo? Essas e outras questões são analisadas no texto, que leva em consideração o novo cenário geopolítico do século XXI.This article explores the impact of emerging economies in international affairs. The arrival of the Bric's countries (Brazil, Russia, India and China has changed the map of the global order and the strategies to project hegemonic power. Could the Bric eclipse the economic power of the richest countries of the world? What are the main strategies of Bric to project its power worldwide? These and other questions are analysed in this text taking into account the new geopolitical scenario of the twenty-first century.

  12. Plasmodesmata of brown algae.

    Science.gov (United States)

    Terauchi, Makoto; Nagasato, Chikako; Motomura, Taizo

    2015-01-01

    Plasmodesmata (PD) are intercellular connections in plants which play roles in various developmental processes. They are also found in brown algae, a group of eukaryotes possessing complex multicellularity, as well as green plants. Recently, we conducted an ultrastructural study of PD in several species of brown algae. PD in brown algae are commonly straight plasma membrane-lined channels with a diameter of 10-20 nm and they lack desmotubule in contrast to green plants. Moreover, branched PD could not be observed in brown algae. In the brown alga, Dictyota dichotoma, PD are produced during cytokinesis through the formation of their precursor structures (pre-plasmodesmata, PPD). Clustering of PD in a structure termed "pit field" was recognized in several species having a complex multicellular thallus structure but not in those having uniseriate filamentous or multiseriate one. The pit fields might control cell-to-cell communication and contribute to the establishment of the complex multicellular thallus. In this review, we discuss fundamental morphological aspects of brown algal PD and present questions that remain open.

  13. ONU: velhos problemas novos desafios

    Directory of Open Access Journals (Sweden)

    KARIN COSTA VASQUEZ

    2010-12-01

    Full Text Available A grande quantidade de crises enfrenta pela Organização das Nações Unidas recentemente contribuiu enormente para o aumento da desilusão com relação à essa instituição. Nesse sentido o presente artigo busca oferecer um panorama da ONU,tendo como focos os antigos problemas a serem enfrentados e os novos constrangimentos que ela deverá enfrentar.

  14. Mosquitos Culicidae como vetores emergentes de infecções Culicidae mosquitoes as emerging vectors of diseases

    Directory of Open Access Journals (Sweden)

    Oswaldo Paulo Forattini

    1998-12-01

    Full Text Available Apresenta-se sucinta revisão do relacionamento entre as chamadas infecções emergentes e o conceito de vetores emergentes. Estes são entendidos não apenas no que concerne aos que são descritos como tais, de forma nova, mas também aqueles com acentuadas mudanças de comportamento. Os fatores específicos que propiciam esse fenômeno identificam-se à poderosa influência humana sobre o ambiente. Assim, aquele construído pelo homem e conhecido como antrópico representa a função de pressão seletiva que induz as populações vetoras a se adaptarem às novas circunstâncias. Nelas inclui-se fatores ecológicos ambientais, ou demográficos, que incrementam o contato com os novos comportamentos vetoriais. Relata-se o encontro de criadouros anômalos de mosquitos Culicidae nas Américas. A interpretação desses encontros é feita visando à vigilância epidemiológica. O significado dessa emergência ou reemergência pode se traduzir no aparecimento de problemas epidemiológicos. Sugere-se que, em sendo assim, a vigilância epidemiológica deva ser feita em grau global.A review is presented of the relationships between the so-called emerging infectious diseases and what may be defined as emerging vectors. These include not only those that have recently appeared but also those that present remarkable behavioral changes. Specific factors leading to that emergence can be associated with the powerful human influence on the environment. So the man-made, i.e. anthropic environment, exercises a selective pressure inducing vector populations to adapt to new circumstances. These may arise from ecological, environmental, or demographic factors that increase contact with the new vector. With this in mind, data on anomalous Culicidae breeding places in the Americas are reported. An interpretation of these findings is offered in the light of epidemiological surveillance. The question is whether vector emergence or re-emergence may constitute an

  15. Problemas de matemáticas

    OpenAIRE

    Usunáriz Balanzategui, Ubaldo; Usunáriz Sala, Ignacio

    2012-01-01

    Este libro, Problemas de Matemáticas, junto con otros dos, Problemas de Geometría y Problemas de Geometría Analítica y Diferencial, están dedicados a la presentación y resolución de problemas que se planteaban hace unas décadas, en la preparación para ingreso en las carreras de ingeniería técnica superior. Incluye 1578 problemas, de los que 848 se refieren al Álgebra (operaciones algebraicas, divisibilidad, combinatoria, determinantes, ecuaciones e inecuaciones, fracciones continuas, números ...

  16. Psycho-physiologic emergentism; four minds in a body

    Directory of Open Access Journals (Sweden)

    David L. Rowland

    2017-10-01

    Full Text Available The mind-body problem represents one of the most debated topics in the neurosciences. From a psychological standpoint, abstract/non-material data are an intrinsic part of the mind, intervening to a large extent in reasoning and decision making processes. Imaging studies also show a strong correlation between higher cognitive functions (such as working memory and specific cerebral brain regions (a fronto-parietal network of interacting left and right brain areas. In contrast, the physical/material brain would be unable to interact with abstract-immaterial data, such that the psychological processing of abstract data (processes such as thinking, reasoning, and judgment is attributed to the mind, with the mind representing a distinct entity interposed between the brain and abstract-immaterial data. Recent data suggest that the mind-body problem may simply be an artifact of human experience/ understanding, as the brain actually represents actually an intrinsic part of the mind. Even if the physical brain is not able to interact with abstract mental data, the brain still could process abstract data through a dynamic association between the abstract data and cerebral stimuli/ impulses. This form of processing without interaction defines the mind as a complex neurobiological structure, with the unconscious part of the mind processing abstract-immaterial data in a conscious/ mental format. In this overview, important concepts of psycho-physiologic emergentism, including internal mental reality, internal mental existence, internal mental interaction, and structural and informational dichotomies of the brain, are iterated. Such concepts/properties represent a neuro-informational support system capable of generating four distinct minds within the single brain. Future studies should further develop the dynamic and immaterial-material nature of the mind, as a possible premise for a scientific definition and understanding of mental events like affectivity

  17. ZOONOSIS TRANSMITIDAS POR ANIMALES SILVESTRES Y SU IMPACTO EN LAS ENFERMEDADES EMERGENTES Y REEMERGENTES

    Directory of Open Access Journals (Sweden)

    Santiago Monsalve B

    2009-08-01

    Full Text Available Las enfermedades emergentes y reemergentes originadas desde animales de vida silvestre, pueden ser transmitidas a las poblaciones humanas por contacto directo o por vectores. Las zoonosis determinan una gran problemática social epidemiológica. La relación que tiene las enfermedades emergentes y reemergentes está ligada a la pérdida de la biodiversidad por factores antropogénicos, debido a la destrucción de hábitats naturales, el tráfico de fauna y a la pérdida de diversidad genética. Todos estos aspectos juegan un papel en la aparición de las patologías de origen infeccioso. Esta revisión intenta acercarse al conocimiento de las zoonosis transmitidas por animales silvestres y su impacto en las enfermedades emergentes y reemergentes.

  18. ZOONOSIS TRANSMITIDAS POR ANIMALES SILVESTRES Y SU IMPACTO EN LAS ENFERMEDADES EMERGENTES Y REEMERGENTES

    OpenAIRE

    Monsalve B, Santiago; Mattar V, Salim; González, Marco

    2009-01-01

    Las enfermedades emergentes y reemergentes originadas desde animales de vida silvestre, pueden ser transmitidas a las poblaciones humanas por contacto directo o por vectores. Las zoonosis determinan una gran problemática social epidemiológica. La relación que tiene las enfermedades emergentes y reemergentes está ligada a la pérdida de la biodiversidad por factores antropogénicos, debido a la destrucción de hábitats naturales, el tráfico de fauna y a la pérdida de diversidad genética. Todos es...

  19. A paradiplomacia financeira em países emergentes de estrutura federativa

    OpenAIRE

    Maia, José Nelson Bessa; Saraiva, José Flávio Sombra

    2016-01-01

    O presente artigo objetiva elaborar uma análise de política comparada por meio do mapeamento da experiência de paradiplomacia financeira em alguns países emergentes. O trabalho expõe o conceito de paradiplomacia financeira; esboça o modelo da paradiplomacia financeira em países de estrutura de governo federativo; compara as experiências de paradiplomacia financeira em quatro países emergentes (Argentina, Índia, México e Rússia); e faz uma síntese das experiências em comparação com o Brasil...

  20. La liberalización de los mercados financieros y las economías emergentes después de la crisis de 2007-2008

    Directory of Open Access Journals (Sweden)

    Faruk Ülgen

    2015-01-01

    Full Text Available Esta colaboración evalúa, a la luz de la crisis de 2007-2008, la importancia de las principales concepciones que ha venido sosteniendo directa o indirectamente, la liberalización financiera como condición estructural para el desarrollo económico. Desde esta perspectiva, se analizan la relación entre el proceso de desarrollo de los mercados financieros, las crisis de las economías de mercados emergentes y la actual crisis. En retrospectiva, parece que las crisis monetarias y financieras de los años 1980-2000, acaecidas durante el proceso de liberalización y apertura (integración internacional en las economías emergentes no descansan, obviamente, sobre la fragilidad estructural que se atribuyen erróneamente al atraso. Esas crisis más bien podrían estar relacionadas de manera más certera con el funcionamiento de las economías liberalizadas. Esta afirmación se apoya en el supuesto de que la inestabilidad financiera es el resultado de los problemas endógenos de los sistemas económicos financiarizados y globalizados, más que al resultado natural de las dificultades de la transición de algunas economías hacia la denominada economía de mercado eficiente. Una version previa de este trabajo fue publicada como “Le développement desmarchés financiers et les crises: Quelles leçons pour les économies émergentes?“, Investigación Económica, Revista de la Facultad de Economía, N° 5, Enero, 2013, pp. 281-310, Centro de Publicaciones Pontificia Universidad Católica del Ecuador (PUCE. Traducción del francés al español por Eugenia Correa.

  1. Modelos de negocio emergentes en la industria del videojuego

    Directory of Open Access Journals (Sweden)

    Milena Trenta

    2013-10-01

    Full Text Available Sylvia Zavala-Trias 12.00 La industria del videojuego está viviendo un proceso de transformación en su manera de crear valor, debido al éxito de los juegos casuales y a la consolidación de nuevas plataformas de juego, cuales las redes sociales, los teléfonos inteligentes, las tabletas y los sitios de juego on line. A consecuencia de estos fenómenos, surgen nuevos modelos de negocio. Posteriormente al estudio del volumen de ingresos generados por los videojuegos distribuidos por canales digitales y de los hábitos de consumo de los usuarios, este trabajo aporta una descripción de los modelos de negocio emergentes en la industria del videojuego. Finalmente, se observa que, frente a la actual situación, las principales compañías del sector diversifican su negocio y las pequeñas empresas aprovechan la multiplicación de los canales de distribución. Mientras que, los usuarios se inclinan por los videojuegos comercializados mediante modelos de negocio que permiten personalizar el consumo y establecer relaciones sociales. Normal 0 21 false false false ES X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-fareast-language:EN-US;}

  2. Enfermedades emergentes y reemergentes: un reto al siglo XXI

    Directory of Open Access Journals (Sweden)

    Raúl L. Riverón Corteguera

    2002-03-01

    Full Text Available Se realiza una actualización de las enfermedades infecciosas emergentes y reemergentes, por la importancia que ellas revisten en el presente siglo al nivel mundial. Se señala la importancia que tienen para los estudiantes de medicina en Cuba, por lo que debe impartirse esta temática desde los primeros años de la carrera, cuando ellos entren al área clínica. De esta forma adquirirán los conocimientos necesarios para poder realizar el diagnóstico de sospecha cuando se encuentren realizando su trabajo profesional tanto en Cuba como en cualquier otro país. Se definen éstas y se hace un recuento de su aparición cronológica, bien por el descubrimiento de los agentes causales ya sean bacterias, virus o parásitos y las enfermedades que ocasionan. Posteriormente se procede a describir las causas posibles de su emergencia o reemergencia y se destaca entre ellas: los cambios ecológicos, el desarrollo de la agricultura, los cambios demográficos y su conducta, el comercio y los viajes internacionales, la tecnología y la industria, la adaptación microbiana y sus cambios y el fracaso en las medidas de salud pública. Se realiza un breve recuento de la repercusión que han tenido estas enfermedades en nuestra América y con referencia a Cuba.An updating is made on the emerging and re-emerging infectious diseases because of their importance worldwide in the present century. The importance of such diseases for medical students in Cuba is also stated since this subject should be taught in the first years of medical studies when the students begin their practice in the clinical area. In this way, they will acquire the necessary knowledge that will enable them to make a suspicion diagnosis when they carry out their professional work both in Cuba and any other part of the world. These diseases are defined along with their chronological occurrence either by the discovery of the causative agents (bacteria, virus or parasites or the diseases caused

  3. Ethos "emergente": as pessoas, as palavras e as coisas

    Directory of Open Access Journals (Sweden)

    Diana Nogueira de Oliveira Lima

    2007-12-01

    Full Text Available O presente artigo reflete sobre o modo como alguns segmentos da "elite" do Rio de Janeiro vêm se servindo dos elementos do universo mercantil para fazerem valer um novo critério classificatório na sociedade brasileira. Com base em análise de material de imprensa sobre a rede de relações carioca conhecida como a "Nova Sociedade Emergente", o argumento central é o de que está em jogo nesse processo de identificação social um ethos que valoriza, concomitantemente, o trabalho árduo e o consumo conspícuo. Tal ethos passou a ser característico de alguns meios sociais a partir de um momento recente de transição na história político-econômica do país. Identifico no jornalismo social o surgimento e funcionamento de um sistema discursivo feito de imagens e notícias que associam sujeitos "bem-sucedidos" ao consumo de bens de alto custo, e que, desde a "abertura dos mercados", na década de 1990, positiva o binômio trabalho/êxito material, fornecendo sustentação simbólica a esse recurso classificatório.This article is an ethnographic study of the ways whereby some sectors of Rio de Janeiro's elites have been playing a key role in shaping the consumption universe and, therefore, creating new classification criteria of the Brazilian society. Using newspaper evidence on the network of relations known as "The New Emerging Society" and direct observation of those elites' life style, my main hypothesis is that those elites share attitudes and a type of mentality that concomitantly cultivate the work ethics and conspicuous consumption. Such attitudes and mentality have become defining features of certain social groups at a given moment in the country's recent political-economic history. Finally, based on evidence culled from the press media, I endeavor to identify the birth and functioning of a discursive system that sanctions the positive value placed on the binomial work ethics and material success, and, relying on the very notion of

  4. Genomics of Volvocine Algae

    Science.gov (United States)

    Umen, James G.; Olson, Bradley J.S.C.

    2015-01-01

    Volvocine algae are a group of chlorophytes that together comprise a unique model for evolutionary and developmental biology. The species Chlamydomonas reinhardtii and Volvox carteri represent extremes in morphological diversity within the Volvocine clade. Chlamydomonas is unicellular and reflects the ancestral state of the group, while Volvox is multicellular and has evolved numerous innovations including germ-soma differentiation, sexual dimorphism, and complex morphogenetic patterning. The Chlamydomonas genome sequence has shed light on several areas of eukaryotic cell biology, metabolism and evolution, while the Volvox genome sequence has enabled a comparison with Chlamydomonas that reveals some of the underlying changes that enabled its transition to multicellularity, but also underscores the subtlety of this transition. Many of the tools and resources are in place to further develop Volvocine algae as a model for evolutionary genomics. PMID:25883411

  5. Transcriptomics in brown algae

    OpenAIRE

    Heinrich, Sandra

    2015-01-01

    Brown algae are distributed worldwide on rocky shores. They are importenet components of ecosystems, they provide habitat, shelter and serve as nurseries for various marine organisms. The geographic as well as depth distribution of macroalgae is constrained by abiotic factors, especially light and temperature. It is therefore likely that due to the global change, distribution patterns of these organisms will change. In this work the molecular acclimation of two prominent brown macroalgae, Sac...

  6. World Health Day 1997: emerging infectious diseases Día Mundial de la Salud 1997: enfermedades infecciosas emergentes

    Directory of Open Access Journals (Sweden)

    1997-05-01

    Full Text Available Para el Día Mundial de la Salud de 1997, la Organización Mundial de la Salud (OMS ha elegido el tema "Enfermedades infecciosas emergentes; alerta mundial, respuesta mundial" con el fin de llamar la atención hacia la amenaza que representan algunas enfermedades infecciosas recientemente reconocidas en seres humanos y otras que han vuelto a aparecer. En la emergencia y reemergencia de enfermedades infecciosas intervienen factores como el deterioro de la infraestructura de salud pública, la creciente resistencia microbiana a los antibióticos y los cambios sociales y ecológicos asociados con el crecimiento de la población humana. La OMS ha hecho hincapié en la necesidad de que se compromentan a entrar juntos en acción tanto países como organizaciones internacionales, organizaciones no gubernamentales e individuos, con objeto de mejorar la vigilancia de las enfermedades y la capacidad de controlarlas para prevenir y refrenar las epidemias. Por su parte, la OMS está reforzando su sistema de vigilancia mundial tripartito, que consta de los centros de colaboración de la OMS en el área de enfermedades infecciosas, las redes de monitoreo de resistencia antimicrobiana y el Reglamento Sanitario Internacional. Para hacer frente adecuadamente al problema de las enfermedades infecciosas durante el siglo próximo, se necesitarán programas de vigilancia y control; redes mundiales de monitoreo y notificación; rápido intercambio de información por vía electrónica (incluida la World Wide Web; y un estado de preparación efectivo con la capacidad para responder rápidamente a las epidemias y contenerlas.

  7. Interlanguage Theory and Emergentism: Reconciliation in Second Language Developmental Index Studies

    Science.gov (United States)

    Wang, Wenting

    2009-01-01

    The present paper generally reviews the history of second language (L2) researchers' efforts in an attempt to find such an index and the possible reasons for the difficulties in establishing the developmental index from both the theoretical and the empirical viewpoints. Two contradictory views--interlanguage theory and emergentism--can finally be…

  8. ESTRATEGIAS Y DESEMPEÑO DE LAS NUEVAS Y EMERGENTES EMPRESAS MULTINACIONALES MEXIANAS

    Directory of Open Access Journals (Sweden)

    José G. Vargas-Hernández

    2010-11-01

    Full Text Available El artículo analiza las nuevas empresas emergentes multinacionales mexicanas (MexEMNEs en el mercado global. Se analizan sus estrategias y desempeño para determinar perfiles y futuros escenarios de desarrollo. Se concluye que la innovación es clave para buscar ventajas y oportunidades en el cambio.

  9. Emergentism as a default: Cancer as a problem of tissue organization

    Indian Academy of Sciences (India)

    Unknown

    plore emergent phenomena. However, new theoretical concepts are needed in order to grapple with the apparent circular causality of complex biological phenomena in development and carcinogenesis. [Soto A M and Sonnenschein C 2004 Emergentism as a default: Cancer as a problem of tissue organization; J. Biosci.

  10. Prevalência de parasitas emergentes e reermergentes de veiculação hídrica em crianças que vivem com HIV/aids: ênfase paraGiardia spp. e Cryptosporidium spp

    OpenAIRE

    Brisa Maria Fregonesi

    2013-01-01

    As doenças de veiculação hídrica são causadas, principalmente, por micro-organismos patogênicos de origem entérica. A partir da década de 1980, as enfermidades causadas por protozoários parasitas emergiram e reemergiram e se tornaram um problema de saúde pública com relevância na atualidade, especialmente para grupos populacionais mais vulneráveis, como pessoas que vivem com HIV/aids. Este trabalho teve por objetivo avaliar a prevalência de parasitas emergentes e reemergentes em criança...

  11. Problemas de Crecimiento Pondo Estatural

    Directory of Open Access Journals (Sweden)

    Ernesto Plata Rueda

    1979-10-01

    Full Text Available

    Quizás sorprenda un poco que este capítulo no se denomine Desnutrición o Distrofia o Síndrome pluricarencial o Malnutrición proteico calórica o Kwashiorkor o Hambre como preferiría llamarla con no poco sarcasmo el pediatra colombiano Gustavo González Ochoá.

    Al denominarlo por los signos de somatometría (peso y talla queremos proseguir la línea general de este libro de tratar los problemas con base en el motivo de consulta y de este modo, solo por no emplear lenguaje familiar en los títulos de los capítulos, no hicimos como hubiéramos preferido llamarlo: "el niño flaco y pequeño" o algo por el estilo_ Quizás el empleo de terminología científica pero rebuscada o lo que es, como en el caso de Kwashiorkor, referida solo a un signo circunstancial (niño rojo, no frecuente entre nosotros y propio solo de estados muy avanzados de desnutrición, ha contribuído a que los' médicos dejen pasar inadvertidos por su consulta los casos mucho más frecuentes de subalimentación incipiente (desnutrición de primer grado que se manifiestan solo por detención de peso y que en términos de manejo oportuno de los problemas, son en extremo importantes pues como bien lo ha señalado Rafael Ramos Galván (Diagnóstico y Tratamiento de la Desnutrición a nivel individual 'Y colectivo. Impresiones Modernas. México (1.968 p. 39, "en desnutrición el tiempo perdido no se recupera" y las carencias cuando
    ocurren en los períodos de mayor crecimiento y se prolongan, si no matan, dejan una huella imborrable en el individuo, tanto en lo físico (nanismo nutricional como en lo psíquico (retardo psicomotor.

    Con la enumeración de términos hecha al principio no queremos embarcarnos en una discusión por demás bizantina sobre semántica, pero sí queremos señalar un hecho que contrista el ánimo cual es el del muy escaso reconocimiento que de la literatura médica latinoamericana se hace en los medios anglosajones. Durante todo lo que

  12. Los Problemas de las Gimnasias

    Directory of Open Access Journals (Sweden)

    Viviana Bulus Rossini

    2011-11-01

    Full Text Available Este artículo se propone sintetizar las principales ideas de las ponencias presentadas en la Mesa de Trabajo "Los problemas de las Gimnasias" que se desarrolló en el marco del 9º Congreso Argentino y 4º Latinoamericano de Educación Física y Ciencias realizado en la Universidad Nacional de La Plata en junio de 2011. Todas ellas coinciden en pensar a la Gimnasia como parte fundamental de una Educación Corporal que se proponga transmitir aquellos saberes corporales culturalmente significativos que sirvan de herramientas para el conocimiento, el cuidado y la autogestión del propio cuerpo. A partir de estos puntos de coincidencia cada ponencia se explaya en su especificidad: ya sea desde la investigación y el análisis de los textos de divulgación y académicos, de los discursos de profesores, alumnos y practicantes; desde el análisis crítico del campo gímnico actual; desde propuestas bien concretas de trabajo de las gimnasias, en este caso la gimnasia aeróbica, la gimnasia funcional, el Método Pilates, o la gimnasia en el Profesorado en Educación Física con proyección en la gimnasia escolar

  13. DATURA STRAMONIUM: Toxicología de una droga emergente

    Directory of Open Access Journals (Sweden)

    Soler Carracedo A

    2013-05-01

    Full Text Available El estramonio (Datura stramonium L, al igual que la gran mayoría de las drogas alucinógenas vegetales, ha sido usado a lo largo de los siglos en un contexto místico-religioso chamánico. Sin embargo, fue en el verano de 2011 cuando se detecta su uso como droga de abuso en España tras el fallecimiento de dos jóvenes en una fiesta “rave” en Getafe (Madrid y una intoxicación aguda de un joven en Badajoz, hechos que generaron una gran alarma social. Todo ello pone de manifiesto la constante variabilidad en la familia de las drogas perturbadoras usadas con fines recreativos. La disponibilidad de este vegetal y el desconocimiento sobre los riesgos de su consumo lo convierten en un serio problema de salud pública. El estramonio posee propiedades alucinógenas y anticolinérgicas debido a su contenido en alcaloides tropánicos, entre los que destacan tres: atropina (DL50= 10 mg en humanos, 400 mg/Kg ratón, hiosciamina y escopolamina (DL50= 2-4 mg en humanos, 619 mg/Kg ratón. Entre los efectos psíquicos y orgánicos destacan la alteración del estado mental con alucinaciones y la taquicardia, respectivamente. El tratamiento de las intoxicaciones agudas es sintomatológico y se dispone de un antídoto, la fisostigmina.

  14. EVALUACIÓN DEL APRENDIZAJE EMERGENTE: UNA EXPERIENCIA CON ESTUDIANTES UNIVERSITARIAS DE EDUCACIÓN PREESCOLAR

    Directory of Open Access Journals (Sweden)

    Eleonora Badilla Saxe

    2008-01-01

    Full Text Available Se aborda en este ensayo la necesidad de comprender y evaluar el aprendizaje como un fenómeno emergente, más allá del aprendizaje previsto en los planes de estudio y diseño curricular. Se ejemplifica con la reflexión del propio aprendizaje emergente de la autora en su proceso de dirección de un proyecto de investigación-acción en la Universidad de Costa Rica. En dicha investigación-acción participaron once estudiantes de licenciatura en educación preescolar y veinticinco niños y niñas de 5 y 6 años que contaron con materiales digitales en su ambiente y proceso de aprendizaje.

  15. Fuel From Algae: Scaling and Commercialization of Algae Harvesting Technologies

    Energy Technology Data Exchange (ETDEWEB)

    None

    2010-01-15

    Broad Funding Opportunity Announcement Project: Led by CEO Ross Youngs, AVS has patented a cost-effective dewatering technology that separates micro-solids (algae) from water. Separating micro-solids from water traditionally requires a centrifuge, which uses significant energy to spin the water mass and force materials of different densities to separate from one another. In a comparative analysis, dewatering 1 ton of algae in a centrifuge costs around $3,400. AVS’s Solid-Liquid Separation (SLS) system is less energy-intensive and less expensive, costing $1.92 to process 1 ton of algae. The SLS technology uses capillary dewatering with filter media to gently facilitate water separation, leaving behind dewatered algae which can then be used as a source for biofuels and bio-products. The biomimicry of the SLS technology emulates the way plants absorb and spread water to their capillaries.

  16. Shewanella algae in acute gastroenteritis

    Directory of Open Access Journals (Sweden)

    S Dey

    2015-01-01

    Full Text Available Shewanella algae is an emerging bacteria rarely implicated as a human pathogen. Previously reported cases of S. algae have mainly been associated with direct contact with seawater. Here we report the isolation of S. algae as the sole etiological agent from a patient suffering from acute gastroenteritis with bloody diarrhoea. The bacterium was identified by automated identification system and 16S rRNA gene sequence analysis. Our report highlights the importance of looking for the relatively rare aetiological agents in clinical samples that does not yield common pathogens. It also underscores the usefulness of automated systems in identification of rare pathogens.

  17. Transgenic algae engineered for higher performance

    Science.gov (United States)

    Unkefer, Pat J; Anderson, Penelope S; Knight, Thomas J

    2014-10-21

    The present disclosure relates to transgenic algae having increased growth characteristics, and methods of increasing growth characteristics of algae. In particular, the disclosure relates to transgenic algae comprising a glutamine phenylpyruvate transaminase transgene and to transgenic algae comprising a glutamine phenylpyruvate transaminase transgene and a glutamine synthetase.

  18. Algae biotechnology: products and processes

    National Research Council Canada - National Science Library

    Bux, F; Chisti, Yusuf

    2016-01-01

    This book examines the utilization of algae for the development of useful products and processes with the emphasis towards green technologies and processes, and the requirements to make these viable...

  19. Algae: America's Pathway to Independence

    National Research Council Canada - National Science Library

    Custer, James

    2007-01-01

    .... Oil dependency is an unacceptable risk to U.S. national strategy. This paper advocates independence from foreign oil by converting the national transportation fleet to biodiesel derived from algae...

  20. Biological importance of marine algae.

    Science.gov (United States)

    El Gamal, Ali A

    2010-01-01

    Marine organisms are potentially prolific sources of highly bioactive secondary metabolites that might represent useful leads in the development of new pharmaceutical agents. Algae can be classified into two main groups; first one is the microalgae, which includes blue green algae, dinoflagellates, bacillariophyta (diatoms)… etc., and second one is macroalgae (seaweeds) which includes green, brown and red algae. The microalgae phyla have been recognized to provide chemical and pharmacological novelty and diversity. Moreover, microalgae are considered as the actual producers of some highly bioactive compounds found in marine resources. Red algae are considered as the most important source of many biologically active metabolites in comparison to other algal classes. Seaweeds are used for great number of application by man. The principal use of seaweeds as a source of human food and as a source of gums (phycocollides). Phycocolloides like agar agar, alginic acid and carrageenan are primarily constituents of brown and red algal cell walls and are widely used in industry.

  1. Acogimiento residencial : problemas emocionales y conductuales

    OpenAIRE

    Delgado Magro, Lorena

    2012-01-01

    En esta investigación se analizó la prevalencia de problemas emocionales y conductuales en niños en acogimiento residencial así como la influencia del tiempo de institucionalización. La muestra estuvo compuesta por 26 niños de ambos sexos en situación residencial y 45 niños que vivían con sus familias emparejados según edades y sexo. El instrumento de evaluación empleado fue el Behavior Assessment System for Children, BASC: autoinforme, formas padres y profesores. Se encontraron más problemas...

  2. Banco de sementes e flora emergente de plantas daninhas Seed bank and abovegroud weed

    Directory of Open Access Journals (Sweden)

    R.A. Isaac

    2008-01-01

    Full Text Available Com o objetivo estudar a relação existente entre o banco de sementes e o posterior estabelecimento da flora emergente de plantas daninhas, sob sistema de semeadura direta e convencional, realizou-se uma pesquisa no município de Pedra Preta-MT. O banco de sementes e a flora emergente foram avaliados, em cada sistema de cultivo, em 50 células contíguas de 1 m². O banco de sementes foi determinado a partir de amostras de 2,4% da área de cada célula na profundidade de 0-5 cm, em setembro de 2003, por meio da técnica de flotação. A flora emergente foi avaliada por meio de seis levantamentos sucessivos, até novembro de 2004, realizados na área total de cada célula, com retirada dos indivíduos após cada avaliação. Esses dados foram utilizados para calcular os parâmetros fitossociológicos e também a correlação entre o banco de sementes e a flora emergente. A similaridade entre o banco de sementes e a flora emergente foi baixa tanto no sistema de semeadura direta quanto no convencional. Houve correlação significativa apenas para Amaranthus deflexus e Eleusine indica entre o banco de sementes e a flora emergente. Para A. deflexus a correlação foi significativa nos dois sistemas de semeadura e, para E. indica, somente para semeadura direta.A study was carried out in Pedra Petra-MT aiming to study the relation between seed bank and posterior aboveground weed in annual crop fields under no-till and tillage systems. The seed bank and weed flora were assessed in fifty contiguous 1 m² cells, under both cultivation systems. The seed bank was determined from soil samples from 4% of the area of each cell at 0-5 cm depth using the flotation technique. The aboveground weed vegetation was evaluated by six successive surveys until November 2004, carried out in the total area of each cell, with removal of the individuals from the area after each evaluation. These data were used to calculate the phyto-sociological parameters and the

  3. Las enfermedades emergentes y reemergentes: un problema de salud en las Américas Emerging and reemerging diseases: a health problem in the Americas

    Directory of Open Access Journals (Sweden)

    Guillermo Mesa Ridel

    2004-04-01

    Full Text Available In the Region of the Americas the emerging and reemerging infectious diseases that had the greatest impact on health, in terms of their incidence and the number of deaths that they caused during the five-year period of 1999­2003, were: malaria, yellow fever, dengue hemorrhagic fever, AIDS, anthrax, and SARS, as well as infection by hantavirus and by West Nile virus. The appearance of epidemics of emerging and reemerging diseases is related to biological, social, and economic factors. Growth in international trade, the movement of large numbers of people across national borders, the variability and genetic adaptability of the causative microorganisms, and inefficiencies in public health systems help to spread infections and epidemics. To avoid or reduce the serious effects of these epidemics, countries should give priority in their national agendas to surveillance of emerging and reemerging diseases and should implement a set of measures to combat the diseases. The most important of these measures is to develop a strategy that is based on early warning and rapid response mechanisms, with personnel and laboratories as well as communications networks that link laboratories with health service providers. This strategy should be backed by priority funding and adequate policies.

  4. Algae-Based Carbon Sequestration

    Science.gov (United States)

    Haoyang, Cai

    2018-03-01

    Our civilization is facing a series of environmental problems, including global warming and climate change, which are caused by the accumulation of green house gases in the atmosphere. This article will briefly analyze the current global warming problem and propose a method that we apply algae cultivation to absorb carbon and use shellfish to sequestrate it. Despite the importance of decreasing CO2 emissions or developing carbon-free energy sources, carbon sequestration should be a key issue, since the amount of carbon dioxide that already exists in the atmosphere is great enough to cause global warming. Algae cultivation would be a good choice because they have high metabolism rates and provides shellfish with abundant food that contains carbon. Shellfish’s shells, which are difficult to be decomposed, are reliable storage of carbon, compared to dead organisms like trees and algae. The amount of carbon that can be sequestrated by shellfish is considerable. However, the sequestrating rate of algae and shellfish is not high enough to affect the global climate. Research on algae and shellfish cultivation, including gene technology that aims to create “super plants” and “super shellfish”, is decisive to the solution. Perhaps the baton of history will shift to gene technology, from nuclear physics that has lost appropriate international environment after the end of the Cold War. Gene technology is vital to human survival.

  5. Internacionalizacion financiera en paises emergentes: Las experiencias monetarias de México y Uruguay

    Directory of Open Access Journals (Sweden)

    Samuel Lichtensztejn

    2015-01-01

    Full Text Available La crisis en curso de 2007-2014, ha tenido diversos efectos sobre las economías de América Latina, entre los cuales se encuentra la alta liquidez, la cual se ha volcado sobre las llamadas economías emergentes. Tanto México como Uruguay han sido polos de atracción de dicha liquidez, generando efectos de alto riesgo para dichas economías. La políticas públicas de ambos países han contribuido a fomentar condiciones de vulnerabilidad en lugar de prevenirla.

  6. Informação: metodologias, temas tradicionais e discussões emergentes

    Directory of Open Access Journals (Sweden)

    Andre Luiz Appel

    2013-08-01

    Full Text Available A AtoZ: novas práticas em informação e conhecimento faz sua estreia no Sistema de Avaliação Qualis-CAPES trazendo novidades em sua interface. Neste novo número a entrevista contempla os principais elementos e desafios da competência informacional, seguida de artigos que abordam a questão da informação no contexto de tecnologias emergentes; ensino de ontologias; enfoques de coleta de dados e legislações voltadas à privacidade de dados pessoais.

  7. Flujos de capital y estabilidad financiera en economías emergentes

    OpenAIRE

    Romero Villanueva, Adriana

    2016-01-01

    En este trabajo se analiza la relación entre flujos de capital y estabilidad financiera en economías emergentes durante el periodo 2000-2014 -- Con el uso de modelos de panel de datos dinámicos se encuentra que los movimientos de flujos de capital hacia estas economías reducen la estabilidad financiera, ya que incrementan los niveles de crédito y conducen al posterior deterioro en la calidad de la cartera de los establecimientos financieros

  8. Tecnologías emergentes para la conservación de alimentos sin calor

    OpenAIRE

    Fernández Molina, Juan José; Barbosa-Cánovas, Gustavo V.; Swanson, Barry G.

    2001-01-01

    Not available

    Se han investigado los principios básicos de tres tecnologías emergentes para pasteurizar y esterilizar alimentos sin empleo del calor Mediante numerosos estudios se ha comprobado la efectividad de los campos eléctricos pulsantes de alta intensidad (CEPAI), los pulsos de luz (PL) y los campos magnéticos oscilantes (CMO) en la destrucción de microorganismos y enzimas de sistemas alimentarios. En la inactivación microbiana por CEPA!, el blanco principal es la me...

  9. LA METÁFORA COMO EMERGENTE DISCURSIVO EN LA ENCÍCLICA LAUDATO SI’

    OpenAIRE

    Piteo, Pablo Sebastián

    2017-01-01

    La metáfora es un esquema cognitivo emergente del discurso. En la encíclicaLaudato si’ el texto se sirve de estas estructuraciones para, por un lado, ejem-plificar y materializar un concepto complejo y abstracto y, por el otro, convocara la instancia receptora a la realización de un cambio ecológico integral. Eltexto papal construye de sí un ethos disruptivo. Si bien el discurso que confi-gura el Papado de Francisco no rompe con los lineamientos doctrinarios másfirmes de la tradición católica...

  10. Cambios globales y su impacto en las obligaciones emergentes del Derecho Internacional de los Derechos Humanos

    OpenAIRE

    García, Lila Emilse

    2006-01-01

    Los cambios operados por la transición desde un sistema interestatal a un sistema mundial, enmarcados en el proceso de globalización, tiene un impacto específico en la concepción de las obligaciones emergentes del Derecho Internacional de los Derechos Humanos (DIDH). En primer lugar, el Estado ha sido desplazado del eje de las relaciones internacionales por la aparición de otros actores (empresas trasnacionales, ONGs); asimismo, han aparecido nuevos sujetos de derecho internacional. La primer...

  11. LA INFLAMACIÓN COMO FACTOR CAUSAL EMERGENTE DE LA ENFERMEDAD CARDIOVASCULAR

    OpenAIRE

    Fernández Mora, Tania; Departamento de Microbiología Facultad de Ciencias Pontificia Universidad Javeriana, Bogotá; Patiño Cuervo, Diana Cristina; Departamento de Microbiología Facultad de Ciencias Pontificia Universidad Javeriana, Bogotá

    2007-01-01

    La ateroesclerosis está involucrada en el desarrollo de la enfermedad cardiovascular, una de las principales enfermedades de morbi-mortalidad en el mundo. Se han determinado una serie de factores de riesgo ,tanto clásicos como emergentes, implicados en el desarrollo de esta enfermedad. Recientes investigaciones han demostrado que la inflamación juega un papel clave en el desarrollo de la ateroesclerosis. Las células del sistema inmune se encuentran presentes en todos los estadios de las lesio...

  12. O Constitucionalismo entre a Fragmentação e a Privatização: Problemas Evolutivos do Direito e da Política na Era da Governança Global

    Directory of Open Access Journals (Sweden)

    Holmes Pablo

    2014-12-01

    Full Text Available O presente artigo trata do debate em curso na teoria política e teoria constitucional, acerca de problemas de constitucionalização de regimes regulatórios transnacionais e supranacionais desde a perspectiva de uma teoria dos sistemas. Ele se volta aos conhecidos problemas de fragmentação do direito e emergência de novas formas de colisão entre regimes, que alteram os mecanismos de funcionamento e exercício do poder. Nas formas emergentes de administração do direito e do poder regulatório em nível transnacional e supranacional, osmecanismosmodernos de democracia política parecem perder seu poder de vinculação. Isso parece ter consequências drásticas para os imperativos modernos de inclusão social.

  13. Aislamiento de algas del embalse del Neusa por medio de cultivos In Vitro

    Directory of Open Access Journals (Sweden)

    A. Maldonado

    2000-07-01

    Full Text Available EI cultivo de algas a nivel mundial es un oficio de vieja data, pero en Colombia se encuentra en sus primeras etapas de desarrollo. El presente trabajo desarrollado en el Laboratorio de Bioensayos, Departamento de Biología, Universidad Nacional de Colombia está encaminado a aportar técnicas en el desarrollo del cultivo de algas. En la parte practica del trabajo se utilizaron muestras de agua del embalse del Neusa las cuales se cultivaron en medios líquido y solido. Se observo un mejor crecimiento de cianofíceas filamentosas en medio solido y algas verdes en medio líquido. Las clamidomonas se ven favorecidas en ambos medios, hecho que permitió aislar una sepa pura de este tipo de algas. Las diatorneas por el hecho de crecer en relación con algas verdes generan un problema metodológico para su aislamiento, que aun se encuentra sin resolver.

  14. Algae Bloom in a Lake

    Directory of Open Access Journals (Sweden)

    David Sanabria

    2008-01-01

    Full Text Available The objective of this paper is to determine the likelihood of an algae bloom in a particular lake located in upstate New York. The growth of algae in this lake is caused by a high concentration of phosphorous that diffuses to the surface of the lake. Our calculations, based on Fick's Law, are used to create a mathematical model of the driving force of diffusion for phosphorous. Empirical observations are also used to predict whether the concentration of phosphorous will diffuse to the surface of this lake within a specified time and under specified conditions.

  15. Microscopic Gardens: A Close Look at Algae.

    Science.gov (United States)

    Foote, Mary Ann

    1983-01-01

    Describes classroom activities using algae, including demonstration of eutrophication, examination of mating strains, and activities with Euglena. Includes on algal morphology/physiology, types of algae, and field sources for collecting these organisms. (JN)

  16. Formation of algae growth constitutive relations for improved algae modeling.

    Energy Technology Data Exchange (ETDEWEB)

    Gharagozloo, Patricia E.; Drewry, Jessica Louise.

    2013-01-01

    This SAND report summarizes research conducted as a part of a two year Laboratory Directed Research and Development (LDRD) project to improve our abilities to model algal cultivation. Algae-based biofuels have generated much excitement due to their potentially large oil yield from relatively small land use and without interfering with the food or water supply. Algae mitigate atmospheric CO2 through metabolism. Efficient production of algal biofuels could reduce dependence on foreign oil by providing a domestic renewable energy source. Important factors controlling algal productivity include temperature, nutrient concentrations, salinity, pH, and the light-to-biomass conversion rate. Computational models allow for inexpensive predictions of algae growth kinetics in these non-ideal conditions for various bioreactor sizes and geometries without the need for multiple expensive measurement setups. However, these models need to be calibrated for each algal strain. In this work, we conduct a parametric study of key marine algae strains and apply the findings to a computational model.

  17. 21 CFR 184.1120 - Brown algae.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 3 2010-04-01 2009-04-01 true Brown algae. 184.1120 Section 184.1120 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN... Substances Affirmed as GRAS § 184.1120 Brown algae. (a) Brown algae are seaweeds of the species Analipus...

  18. 21 CFR 184.1121 - Red algae.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 3 2010-04-01 2009-04-01 true Red algae. 184.1121 Section 184.1121 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN... Substances Affirmed as GRAS § 184.1121 Red algae. (a) Red algae are seaweeds of the species Gloiopeltis...

  19. Juego emergente: ¿Nuevas formas de contar historias en videojuegos?

    Directory of Open Access Journals (Sweden)

    Federico Peinado

    2012-04-01

    Full Text Available Tras treinta años de desarrollo caracterizados por la escalada en rendimiento del hardware, el mercado de los videojuegos está sufriendo una lenta transformación. Los últimos avances tecnológicos en gráficos están empezando a no ser tan decisivos como las mejoras en inteligencia artificial o las nuevas ideas de diseño. Una vez asumido el boom del mercado de los videojuegos y el crecimiento en el espectro social de jugadores, la industria y la comunidad investigadora de reciente creación se están interesando en un nuevo concepto de juego que pone la potencia actual del hardware al servicio del diseño de experiencias interactivas donde el jugador se sienta aún más involucrado. Con este nuevo concepto de juego emergente da comienzo una etapa importante en cuanto a las propiedades narrativas del videojuego: el devenir de los acontecimientos secundarios puede adaptarse al jugador, aunque la historia principal sigue necesitando del autor humano y no puede ser alterada en sus acontecimientos principales. Aún así, el juego emergente representa un esperanzador avance frente a la rígida estructura narrativa con que contaban hasta hace muy poco los videojuegos.

  20. Un problema fundamental en la investigación: Los problemas P vs. NP

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Maldonado

    2013-01-01

    Full Text Available Lo más difícil y apasionante en cualquier investigación consiste en la formulación o identificación del problema. La metodología de la investigación científica no ha abordado suficientemente este tema, y tanto menos cuando se trata de fenómenos, contextos, problemas o sistemas complejos. Este texto presenta, discute y reflexiona acerca de los problemas P vs. NP direccionando la mirada hacia el espacio de la investigación y su metodología. Algunos de los ejes de reflexión que resultan son los de la complejidad algorítmica y la complejidad computacional de un problema. Al final se sugiere la tesis del trabajo con problemas en términos de conjuntos y espacios de solución en relación directa con la clase problemas P =! NP .

  1. Scenario studies for algae production

    NARCIS (Netherlands)

    Slegers, P.M.

    2014-01-01

    Microalgae are a promising biomass for the biobased economy to produce food, feed, fuel, chemicals and materials. So far, large-scale production of algae is limited and as a result estimates on the performance of such large systems are scarce. There is a need to estimate large-scale biomass

  2. Algae. LC Science Tracer Bullet.

    Science.gov (United States)

    Niskern, Diana, Comp.

    The plants and plantlike organisms informally grouped together as algae show great diversity of form and size and occur in a wide variety of habitats. These extremely important photosynthesizers are also economically significant. For example, some species contaminate water supplies; others provide food for aquatic animals and for man; still others…

  3. Macro algae as substrate for biogas production

    DEFF Research Database (Denmark)

    Møller, Henrik; Sarker, Shiplu; Gautam, Dhan Prasad

    Algae as a substrate for biogas is superior to other crops since it has a much higher yield of biomass per unit area and since algae grows in the seawater there will be no competition with food production on agricultural lands. So far, the progress in treating different groups of algae as a source...... of energy is promising. In this study 5 different algae types were tested for biogas potential and two algae were subsequent used for co-digestion with manure. Green seaweed, Ulva lactuca and brown seaweed Laminaria digitata was co-digested with cattle manure at mesophilic and thermophilic condition...

  4. Problemas psicosociales en hostelería

    OpenAIRE

    Pérez Martínez, Alberto

    2015-01-01

    Las metas consistirán en: 1- Describir los distintos factores psicosociales que pueden dar lugar a generar estrés en función de las condiciones de trabajo en el que se encuentran la plantilla. 2- Determinar los principales responsables de la existencia de riesgo en los problemas psicosociales. 3- Definir los puntos positivos que permiten unas buenas condiciones de trabajo psicosociales. He trabajado las competencias relativas al estudio que pretende el TFG. Competencias de Psicolo...

  5. Analisi matematica del problema dello spazio

    CERN Document Server

    Weyl, Hermann

    1990-01-01

    Al fine di rendere concettualmente evidente il privilegio posseduto dalla metrica pitagorico-riemanniana, e dalle varie metriche riemanniane "indefinite", rispetto alle altre metriche possibili, nel 1921 Weyl, stimolato dagli sviluppi della relatività einsteiniana (sulla quale aveva scritto il mirabile "Raum-Zeit-Materie"), intraprese un profondo studio del problema giovandosi dei metodi della teoria dei gruppi di Lie, studio che egli portò a conclusione con la monografia del 1923 intitolata "Mathematische Analyse des Raumproblems".

  6. Iniciativa europea del radar para riesgos emergentes - ¿una posibilidad a futuro para América Latina?

    Directory of Open Access Journals (Sweden)

    Aleksandar Jovanovic

    2013-04-01

    Full Text Available El proyecto de la Unión Europea (UE: Reconocimiento temprano, monitoreo y gestión integral de riesgos emergentes relacionados con las nuevas tecnologías -iNTeg-Risk ha desarrollado un pragmático e inusual enfoque para un marco integral en la gestión de riesgos emergentes. El principal objetivo de este trabajo fue desarrollar una serie de soluciones específicas e innovadoras aplicando buenos principios de gestión de riesgos y elaborar soluciones más genéricas e integradas, que todas juntas, nos permitan “entender mejor cómo gestionar los riesgos emergentes en un mundo incierto y complejo”El presente artículo presenta una visión general de los diferentes resultados y herramientas desarrolladas a través del proyecto iNTeg-Risk, resaltando algunos logros muy importantes en relación con riesgos emergentes en el área de seguridad de los procesos tales como la regasificación de LNG, operaciones remotas, eventos NaTech, entre otros. Con el fin de asegurar sostenibilidad de los resultados de iNTeg-Risk, el radar europeo de riesgos emergente (E2R2 es una iniciativa prevista como uno de los caminos potenciales para el reconocimiento temprano, monitoreo y gestión de riesgos emergentes.En su fase inicial, los principales componentes de la iniciativa E2R2 son las aplicaciones/herramientas desarrolladas a lo largo del proyecto iNTeg-Risk, tales como RiskAtlas, RiskEars, RiskRadar, RiskClock, RiskTweet, etc. Las entradas multicanales para la iniciativa E2R2 han sido planeadas ser de diferentes fuentes: expertos, proyectos de investigación, publicaciones científicas, aplicaciones web, redes sociales/profesionales y el público en general, por lo tanto, una colaboración posible con interesados latinoamericanos en el futuro seria beneficiosa especialmente para aquellos riesgos emergentes con un carácter más globalizado.

  7. Sorção de poluentes orgânicos emergentes em lodo de esgoto

    Directory of Open Access Journals (Sweden)

    Simone Bittencourt

    2016-03-01

    Full Text Available RESUMO O uso de lodo de esgoto na agricultura promove a reciclagem de nutrientes e de matéria orgânica, trazendo benefícios ao desenvolvimento vegetal e à conservação do solo e da água. No entanto, é crescente a preocupação com poluentes orgânicos que possam estar no lodo de esgoto. A presença de medicamentos (antibióticos, tranquilizantes, antiepilépticos, hormônios (naturais e sintéticos, perfumes, bactericidas, entre outros poluentes orgânicos, em diferentes compartimentos ambientais é uma questão emergente, devido à escassez de informações sobre o impacto potencial associado à sua ocorrência, seu destino e efeitos ecotoxicológicos. Esses compostos, denominados poluentes orgânicos emergentes, podem ser removidos durante o tratamento de esgoto por degradação, transformação biológica, volatilização e/ou sorção ao lodo. Esses processos são influenciados pelas propriedades físicas e químicas do poluente e pelas condições de tratamento do esgoto. Informações sobre características físico-químicas, como potencial de acidez e hidrofobicidade, são importantes para compreender os mecanismos de remoção e para adoção de medidas que favoreçam a remoção de tais poluentes, como por exemplo a alteração nas condições operacionais e/ou adoção de tecnologias. A presente revisão bibliográfica apresenta as características físico-químicas de poluentes orgânicos emergentes e seu potencial de sorção em lodo de esgoto.

  8. O fluxo de capital para as economias emergentes e o grau de desenvolvimento do sistema financeiro

    Directory of Open Access Journals (Sweden)

    Katia Rocha

    Full Text Available Resumo O presente artigo tem como objetivo analisar o papel do sistema financeiro doméstico como mitigador de eventos de paradas súbitas e condicionante de fluxos de capital de um grupo de 14 economias emergentes no período de 1999-2013, em especial em face de cenários externos desfavoráveis como aumento dos juros internacionais e aversão ao risco global. Os países analisados - Argentina, Brasil, Chile, Colômbia, Indonésia, Malásia, México, Peru, Filipinas, Rússia, África do Sul, Tailândia, Turquia e Ucrânia representavam, em agosto de 2014, aproximadamente 80% do índice EMBIPLUS e 60% do índice EMBIGLOBAL. Procurou-se distinguir o efeito sobre diversos tipos de fluxos de capital: Fluxo de entrada de Investimento Externo Direto, Fluxo de entrada de Investimento em Carteira e Fluxo Líquido, com análise de robustez para período desde 1990 e aumento do número de países emergentes. O principal resultado suporta evidências que o fortalecimento do sistema financeiro doméstico - medido com a capitalização bursátil em proporção do PIB - propicia aumento dos fluxos de entrada de capital de todos os tipos de fluxos em todos os modelos analisados, reduzindo a probabilidade de ocorrência de parada súbita do fluxo de Investimento Externo Direto e em alguns casos do fluxo de Carteira, o que motiva políticas públicas que incentivem o desenvolvimento e fortalecimento deste setor. Estimativas também destacam o papel dos fundamentos domésticos, tão importantes quanto os fatores globais nos condicionantes de fluxo de capital e na ocorrência paradas súbitas. Este fato motiva políticas públicas que incentivem o fortalecimento e desenvolvimento das instituições nos países emergentes, e ressalta o papel dos governos na captação de recursos externos.

  9. Pedagogías emergentes en contextos cambiantes: pedagogías en red en la sociedad del conocimiento

    Directory of Open Access Journals (Sweden)

    Binod Gurung

    2015-07-01

    Full Text Available La noción de pedagogías es un concepto multidimensional emergente construido a partir de la relación entre los componentes pedagógicos (como la tecnología, la pedagogía y el contenido y los contextos pedagógicos cambiantes de la sociedad, la economía, la educación y la ciencia y tecnología para mencionar algunos. Desafortunadamente, para los marcos teóricos tradicionales existentes no es importante la relación entre los componentes y los contextos pedagógicos cambiantes. Las pedagogías tradicionales existentes se ven como estáticas y unidimensionales y se enfocan exclusivamente en los componentes o en los contextos. En este artículo, propongo repensar las pedagogías tradicionales existentes y enmarcarlas como pedagogías emergentes, con el fin de encontrar la naturaleza emergente y multidimensional de la pedagogía en los actuales contextos pedagógicos cambiantes que evolucionan dentro de redes en la sociedad del conocimiento, la economía del conocimiento, la democracia orientada en la diversidad y la alfabetización digital. Así, a través del reconocimiento de las fortalezas y debilidades de dos marcos pedagógicos esenciales –como son el conocimiento pedagógico y tecnológico del contenido (TPCK, por su sigla en inglés, y la educación multicultural (MCE, por su sigla en inglés–, se plantea una discusión teórica sobre las pedagogías emergentes como concepto y como práctica. Igualmente, se hace una recomendación para futuras investigaciones y teorías relacionadas con las pedagogías emergentes.

  10. De cómo la realidad puede tomar parte en juegos emergentes

    Directory of Open Access Journals (Sweden)

    Federico Peinado

    2012-04-01

    Full Text Available Este artículo es un estudio del fenómeno de la utilización de elementos reales en aplicaciones software de entretenimiento. De manera más o menos explícita y significativa, este fenómeno se encuentra en la experiencia de juego de numerosos juguetes y experimentos digitales, así como de algunos videojuegos comerciales de gran popularidad; es interesante conocer, por tanto, sus implicaciones estéticas y funcionales a la hora de diseñar interfaces y sistemas de jugabilidad emergente, así como la posible evolución que este fenómeno de la realidad como componente lúdico puede sufrir en los próximos años.

  11. Desarrollo divergente en África subsahariana: economías emergentes frente a estados fallidos

    OpenAIRE

    Medina Moral, Eva; Montes Gan, Vicente José

    2014-01-01

    La heterogeneidad de África Subsahariana invalida el análisis tradicional sobre su desarrollo, de enfoque fatalista, dominado por el concepto de dummy. En la región conviven países que convergen, bien hacia el modelo de economía emergente, bien hacia la tipología de Estado fallido. El análisis de la evolución de los clusters de países en función de la fragilidad de sus Estados durante el período 1995-2013 permite identificar casos de «éxito» y de «fracaso» en este campo. La com...

  12. Repensar la profundización financiera: estabilidad y crecimiento en los mercados emergentes

    Directory of Open Access Journals (Sweden)

    Ratna Sahay

    2015-12-01

    Full Text Available En este escrito se usa una nueva medida del desarrollo financiero para mostrar que la mayoría de los mercados emergentes aún puede obtener beneficios de crecimiento y estabilidad con un mayor desarrollo financiero. Primero define el desarrollo financiero como una combinación de profundidad, acceso y eficiencia. Luego muestra que el crecimiento económico se debilita a mayores niveles de desarrollo financiero y que el ritmo del desarrollo financiero es importante; además propone una nueva manera de ver los “tradeoffs” de la regulación financiera. Concluye que no hay una secuencia única en el desarrollo de las instituciones y los mercados financieros, aunque se observa cuando las economías se desarrollan los beneficios relativos de las instituciones disminuyen y los de los mercados aumentan.

  13. Bioética global y pensamiento complejo. Hacia una emergente manera de ser

    Directory of Open Access Journals (Sweden)

    Sergio Néstor Osorio García

    2008-01-01

    Full Text Available La Bioética global como el pensamiento complejo sólo pueden entenderse en su novedad, si las comprendemos como estrategias emergentes que buscan enfrentar y responder a los desafíos de nuestra era planetaria. Desafíos que retan como nunca nuestra creatividad histórica para habitar la tierra. La consolidación y desarrollo de estas dos importantes estrategias del pensamiento y la acción, nos podrían ayudar en la construcción de un mundo más decente para los humanos y menos destructivo para con los ecosistemas no-humanos.

  14. Synthetic polyester from algae oil.

    Science.gov (United States)

    Roesle, Philipp; Stempfle, Florian; Hess, Sandra K; Zimmerer, Julia; Río Bártulos, Carolina; Lepetit, Bernard; Eckert, Angelika; Kroth, Peter G; Mecking, Stefan

    2014-06-23

    Current efforts to technically use microalgae focus on the generation of fuels with a molecular structure identical to crude oil based products. Here we suggest a different approach for the utilization of algae by translating the unique molecular structures of algae oil fatty acids into higher value chemical intermediates and materials. A crude extract from a microalga, the diatom Phaeodactylum tricornutum, was obtained as a multicomponent mixture containing amongst others unsaturated fatty acid (16:1, 18:1, and 20:5) phosphocholine triglycerides. Exposure of this crude algae oil to CO and methanol with the known catalyst precursor [{1,2-(tBu2 PCH2)2C6H4}Pd(OTf)](OTf) resulted in isomerization/methoxycarbonylation of the unsaturated fatty acids into a mixture of linear 1,17- and 1,19-diesters in high purity (>99 %). Polycondensation with a mixture of the corresponding diols yielded a novel mixed polyester-17/19.17/19 with an advantageously high melting and crystallization temperature. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  15. Growing swimming algae for bioenergy

    Science.gov (United States)

    Croze, Ottavio

    Biofuel production from photosynthetic microalgae is not commercially viable due to high processing costs. New engineering and biological solutions are being sought to reduce these costs by increasing processing efficiency (productivity per energy input). Important physics, however, is ignored. For example, the fluid dynamics of algal suspensions in photobioreactors (ponds or tube arrays) is non-trivial, particularly if the algae swim. Cell reorientation by passive viscous and gravitational torques (gyrotaxis) or active reorientation by light (phototaxis) cause swimming algae in suspension to structure in flows, even turbulent ones. This impacts the distribution and dispersion of swimmers, with significant consequences for photobioreactor operation and design. In this talk, I will describe a theory that predicts swimmer dispersion in laminar pipe flows. I will then then present experimental tests of the theory, as well as new results on the circadian suspension dynamics of the algaChlamydomonas reinhardtii in lab-scale photobioreactors. Finally, I will briefly consider the implications of our work, and related active matter research, for improving algal bioprocessing efficiency. Winton Programme for the Physics of Sustainability.

  16. Parasites in algae mass culture

    Directory of Open Access Journals (Sweden)

    Todd William Lane

    2014-06-01

    Full Text Available Parasites are now known to be ubiquitous across biological systems and can play an important role in modulating algal populations. However, there is a lack of extensive information on their role in artificial ecosystems such as algal production ponds and photobioreactors. Parasites have been implicated in the demise of algal blooms. Because individual mass culture systems often tend to be unialgal and a select few algal species are in wide scale application, there is an increased potential for parasites to have a devastating effect on commercial scale monoculture. As commercial algal production continues to expand with a widening variety of applications, including biofuel, food and pharmaceuticals, the parasites associated with algae will become of greater interest and potential economic impact. A number of important algal parasites have been identified in algal mass culture systems in the last few years and this number is sure to grow as the number of commercial algae ventures increases. Here, we review the research that has identified and characterized parasites infecting mass cultivated algae, the techniques being proposed and or developed to control them, and the potential impact of parasites on the future of the algal biomass industry.

  17. Bioethanol Production from Indigenous Algae

    Directory of Open Access Journals (Sweden)

    Madhuka Roy

    2015-02-01

    Full Text Available Enhanced rate of fossil fuel extraction is likely to deplete limited natural resources over short period of time. So search for alternative fuel is only the way to overcome this problem of upcoming energy crisis. In this aspect biofuel is a sustainable option. Agricultural lands cannot be compromised for biofuel production due to the requirement of food for the increasing population. Certain species of algae can produce ethanol during anaerobic fermentation and thus serve as a direct source for bioethanol production. The high content of complex carbohydrates entrapped in the cell wall of the microalgae makes it essential to incorporate a pre-treatment stage to release and convert these complex carbohydrates into simple sugars prior to the fermentation process. There have been researches on production of bioethanol from a particular species of algae, but this work was an attempt to produce bioethanol from easily available indigenous algae. Acid hydrolysis was carried out as pre-treatment. Gas Chromatographic analysis showed that 5 days’ fermentation by baker’s yeast had yielded 93% pure bioethanol. The fuel characterization of the bioethanol with respect to gasoline showed comparable and quite satisfactory results for its use as an alternative fuel.DOI: http://dx.doi.org/10.3126/ije.v4i1.12182International Journal of Environment Volume-4, Issue-1, Dec-Feb 2014/15, page: 112-120  

  18. El maltrato infantil: un problema mundial

    Directory of Open Access Journals (Sweden)

    SANTANA-TAVIRA ROSALINDA

    1998-01-01

    Full Text Available Al abordar el maltrato infantil se presentan diversos problemas: desconocimiento de la verdadera proporción de dicha problemática; raíces culturales e históricas profundas; diversidad de opiniones en cuanto a su definición y clasificación; dificultades en la investigación y, finalmente, una diversidad de consideraciones sobre sus repercusiones y su manejo terapéutico. En el presente artículo se estudia el maltrato infantil desde sus antecedentes históricos, así como sus clasificaciones, sus definiciones y su epidemiología. Asimismo, se revisan las repercusiones y se plantean las alternativas de tratamiento que en la bibliografía existente se han manejado como fundamentales para enfrentar este fenómeno cada vez más alarmante. Queda subrayada la necesidad de unificar criterios en cuanto a la definición y clasificación de información científica en torno a datos demográficos que, finalmente, hablarán de la realidad del problema, de los avances relacionados con sus causas, su diagnóstico, sus medidas preventivas y su tratamiento. Es fundamental utilizar medidas tendientes a prevenir el maltrato, pues una gran parte de los problemas en el niño se ven reflejados en la vida adulta. Se comparan las distintas clasificaciones en torno al tema, así como las características tanto del agredido como del agresor en los distintos tipos de maltrato.

  19. Servicio militar un problema de identidades

    OpenAIRE

    Sánchez Navarro, Eulogio

    2005-01-01

    Las diferencias entre la vida civil y la militar han supuesto tradicionalmente lo que podríamos definir como un choque cultural entre aquellos que tuvieron que realizar el servicio militar obligatorio. este choque se vio incrementado en los últimos años de conscripción debido al creciente distanciamiento entre las visiones de mundo de militares y civiles. esta tesis analiza desde la perspectiva de la antropología social los problemas de identidad de los soldados de reemplazo, que habían de...

  20. Problemas de bancarrota multi-escenario.

    Directory of Open Access Journals (Sweden)

    Francisca J. Sánchez

    2004-01-01

    Full Text Available Los problemas de bancarrota representan situaciones donde un número de individuos o entidades acreedoras realizan reclamaciones sobre un cierto bien (estado y el estado total disponible es insuficiente para satisfacer la demanda de todos los acreedores. En este trabajo consideramos el caso en que las reclamaciones de los acreedores dependen de distintos escenarios o que son diferentes bajo distintos estados de la naturaleza. Para obtener repartos del estado disponible en estas situaciones proponemos distintas reglas de división que pueden considerarse racionales independientemente del escenario considerado.

  1. Bacterial Enhancement of Vinyl Fouling by Algae

    OpenAIRE

    Holmes, Paul E.

    1986-01-01

    The role of bacteria in the development of algae on low-density vinyl was investigated. Unidentified bacterial contaminants in unialgal stock cultures of Phormidium faveolarum and Pleurochloris pyrenoidosa enhanced, by 1 to 2 orders of magnitude, colonization of vinyl by these algae, as determined by epifluorescence microscopy counts and chlorophyll a in extracts of colonized vinyl. Colonization by bacteria always preceded that by algae. Scanning electron microscopy of the colonized Phormidiu...

  2. Antioxidant Activity of Hawaiian Marine Algae

    OpenAIRE

    Kelman, Dovi; Posner, Ellen Kromkowski; McDermid, Karla J.; Tabandera, Nicole K.; Wright, Patrick R.; Wright, Anthony D.

    2012-01-01

    Marine algae are known to contain a wide variety of bioactive compounds, many of which have commercial applications in pharmaceutical, medical, cosmetic, nutraceutical, food and agricultural industries. Natural antioxidants, found in many algae, are important bioactive compounds that play an important role against various diseases and ageing processes through protection of cells from oxidative damage. In this respect, relatively little is known about the bioactivity of Hawaiian algae that cou...

  3. Stochastic Forecasting of Algae Blooms in Lakes

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Peng; Tartakovsky, Daniel M.; Tartakovsky, Alexandre M.

    2013-01-15

    We consider the development of harmful algae blooms (HABs) in a lake with uncertain nutrients inflow. Two general frameworks, Fokker-Planck equation and the PDF methods, are developed to quantify the resultant concentration uncertainty of various algae groups, via deriving a deterministic equation of their joint probability density function (PDF). A computational example is examined to study the evolution of cyanobacteria (the blue-green algae) and the impacts of initial concentration and inflow-outflow ratio.

  4. Enfermedades infecciosas emergentes: interacción entre el mundo microbiano y las sociedades humanas (Emergent infectious diseases: interaction between the microbial world and human societies)

    OpenAIRE

    Fernando García

    2008-01-01

    En este artículo se analizan dos facetas importantes de las enfermedades infecciosas emergentes. Por un lado, las características de los microorganismos que las causan, por otro, las características del ser humano que promueven o contribuyen al surgimiento de las enfermedades infecciosas. Desde el punto de vista microbiano, se pueden identificar tres aspectos fundamentales. Primero, los patógenos emergentes son predominantemente virales, seguidos por los bacterianos. Numéricamente los virus A...

  5. Doenças infecciosas emergentes no Uruguai: memórias do século 20

    OpenAIRE

    María Hortal; Gabriela Garcia Gabarrot

    2017-01-01

    As doenças emergentes não são novos eventos epidemiológicos: existiram epidemias, mesmo no território uruguaio. A globalização com múltiplos fatores de intervenção acentuou o dinamismo biológico de agentes infecciosos e populações humanas. Considerando que uma doença emergente é causada por um novo agente ou que produz uma série de casos que excedem o número esperado, que invade uma área geográfica diferente ou reaparece após um desaparecimento prolongado, foram feitas tentativas para recuper...

  6. FACTORES DE RIESGO CONVENCIONALES Y EMERGENTES EN CÁNCER DE MAMA: UN ESTUDIO EN PACIENTES POSMENOPÁUSICAS

    OpenAIRE

    Actis,Andrea Mariel; Bergoc,Rosa María; Quartucci,Ángel; Outomuro,Delia

    2009-01-01

    Antecedentes: Dentro de los factores de riesgo (FR) para el desarrollo del cáncer de mama (CM), algunos son invariables, como la edad, antecedentes familiares de CM, historia reproductiva, etc., y los denominaremos FR convencionales (FRC). Los relacionados con hábitos socioculturales y del cuidado de la salud, pueden ser modificados para disminuir su aporte al desarrollo de CM, como la obesidad y el sedentarismo, y los denominaremos FR emergentes (FRE), debido al aumento de su prevalencia. Ob...

  7. Aprendizaje colaborativo a través de problemas

    Directory of Open Access Journals (Sweden)

    María José Labrador Piquer

    2011-01-01

    Full Text Available El objetivo de este taller ha sido acercar a los asistentes al aprendizaje colaborativo a través de problemas en la enseñanza de ELE, para ello, partimos de unas nociones básicas de aprendizaje cooperativo/colaborativo y del análisis de problemas, continuamos con el estudio de problemas y finalizamos con una serie de reflexiones sobre la evaluación. Durante la sesión los asistentes han realizado dos funciones: una, como alumnos analizando y resolviendo los problemas y otra, como profesores reflexionando sobre las destrezas practicadas y sobre la evaluación.

  8. Aprendizaje colaborativo a través de problemas

    Directory of Open Access Journals (Sweden)

    María José Labrador Piquer

    2012-08-01

    Full Text Available El objetivo de este taller ha sido acercar a los asistentes al aprendizaje colaborativo a través de problemas en la enseñanza de ELE, para ello, partimos de unas nociones básicas de aprendizaje cooperativo/colaborativo y del análisis de problemas, continuamos con el estudio de problemas y finalizamos con una serie de reflexiones sobre la evaluación. Durante la sesión los asistentes han realizado dos funciones: una, como alumnos analizando y resolviendo los problemas y otra, como profesores reflexionando sobre las destrezas practicadas y sobre la evaluación.

  9. Los problemas de las fronteras humanitarias

    Directory of Open Access Journals (Sweden)

    Ticktin, Miriam

    2015-12-01

    Full Text Available This text engages a critical analysis of humanitarian discourses and practices regarding our understanding of migration and the public policies developed in relation to the population movementsacross international borders. It is based on the premise that humanitarianism, even if well intentioned, can have pernicious effects if, eventually, it ends up replacing justice and migrants’ rights. To explore this paradox, the paper sequentially analyzes various problems associated with humanitarian aid: the problem of innocence —the understanding of refugees as victims calls for humanitarian compassion—; the problem with emergency —«rapid response» operations inhibit the contextualized and historical understanding of the root causes of the problems—; and, finally, the problem of compassion —humanitarianism privilegessentiments over rights. The study of these three key features of humanitarianism in Europe and the USA fosters a healthy skepticism of the emerging forms of the legitimation of exclusion. The article also explores alternative political and discursive strategies which allow for new imaginaries to confront migratory processes beyond borders and humanitarianism, breaking up their dynamic of reproduction of social inequalities and placing justice in the horizon of action.Este texto plantea un análisis crítico del papel de los discursos y prácticas humanitaristas en nuestra concepción de la migración y en las políticas públicas desarrolladas en relación a la movilidad poblacional a través de las fronteras internacionales. Se parte de la premisa de que el humanitarismo, aunque fuera bien intencionado, puede tener efectos perniciosos sobre la situación que se vive en las fronteras, especialmente si acaba por sustituir a la justicia y a los derechos que tienen los emigrantes. Para estudiar esta paradoja, el texto analiza, sucesivamente, varios problemas asociados a la acción humanitaria: el problema con la inocencia

  10. Cultivation of macroscopic marine algae

    Energy Technology Data Exchange (ETDEWEB)

    Ryther, J.H.

    1982-11-01

    The red alga Gracilaria tikvahiae may be grown outdoors year-round in central Florida with yields averaging 35.5 g dry wt/m/sup 2/.day, greater than the most productive terrestrial plants. This occurs only when the plants are in a suspended culture, with vigorous aeration and an exchange of 25 or more culture volumes of enriched seawater per day, which is not cost-effective. A culture system was designed in which Gracilaria, stocked at a density of 2 kg wet wt/m/sup 2/, grows to double its biomass in one to two weeks; it is then harvested to its starting density, and anaerobically digested to methane. The biomass is soaked for 6 hours in the digester residue, storing enough nutrients for two weeks' growth in unenriched seawater. The methane is combusted for energy and the waste gas is fed to the culture to provide mixing and CO/sub 2/, eliminating the need for aeration and seawater exchange. The green alga Ulva lactuca, unlike Gracilaria, uses bicarbonate as a photosynthesis carbon source, and can grow at high pH, with little or no free CO/sub 2/. It can therefore produce higher yields than Gracilaria in low water exchange conditions. It is also more efficiently converted to methane than is Gracilaria, but cannot tolerate Florida's summer temperatures so cannot be grown year-round. Attempts are being made to locate or produce a high-temperature tolerant strain.

  11. Modeling and optimization of algae growth

    NARCIS (Netherlands)

    Thornton, Anthony Richard; Weinhart, Thomas; Bokhove, Onno; Zhang, Bowen; van der Sar, Dick M.; Kumar, Kundan; Pisarenco, Maxim; Rudnaya, Maria; Savceno, Valeriu; Rademacher, Jens; Zijlstra, Julia; Szabelska, Alicja; Zyprych, Joanna; van der Schans, Martin; Timperio, Vincent; Veerman, Frits; Frank, J.; van der Mei, R.; den Boer, A.; Bosman, J.; Bouman, N.; van Dam, S.; Verhoef, C.

    2010-01-01

    The wastewater from greenhouses has a high amount of mineral contamination and an environmentally-friendly method of removal is to use algae to clean this runo water. The algae consume the minerals as part of their growth process. In addition to cleaning the water, the created algal bio-mass has a

  12. SSMILes: Measuring the Nutrient Tolerance of Algae.

    Science.gov (United States)

    Hedgepeth, David J.

    1995-01-01

    Presents an activity integrating mathematics and science intended to introduce students to the use of metric measurement of mass as a way to increase the meaningfulness of observations about variables in life sciences. Involves measuring the nutrient tolerance of algae. Contains a reproducible algae nutrient graph. (Author/MKR)

  13. Modeling and optimization of algae growth

    NARCIS (Netherlands)

    Thornton, Anthony Richard; Weinhart, Thomas; Bokhove, Onno; Zhang, Bowen; van der Sar, Dick M.; Kumar, Kundan; Pisarenco, Maxim; Rudnaya, Maria; Savcenco, Valeriu; Rademacher, Jens; Zijlstra, Julia; Szabelska, Alicja; Zyprych, Joanna; van der Schans, Martin; Timperio, Vincent; Veerman, Frits

    2010-01-01

    The wastewater from greenhouses has a high amount of mineral contamination and an environmentally-friendly method of removal is to use algae to clean this runoff water. The algae consume the minerals as part of their growth process. In addition to cleaning the water, the created algal bio-mass has a

  14. Algae commensal community in Genlisea traps

    Directory of Open Access Journals (Sweden)

    Konrad Wołowski

    2011-01-01

    Full Text Available The community of algae occurring in Genlisea traps and on the external traps surface in laboratory conditions were studied. A total of 29 taxa were found inside the traps, with abundant diatoms, green algae (Chlamydophyceae and four morphotypes of chrysophytes stomatocysts. One morphotype is described as new for science. There are two ways of algae getting into Genlisea traps. The majority of those recorded inside the traps, are mobile; swimming freely by flagella or moving exuding mucilage like diatoms being ablate to colonize the traps themselves. Another possibility is transport of algae by invertebrates such as mites and crustaceans. In any case algae in the Genlisea traps come from the surrounding environment. Two dominant groups of algae (Chladymonas div. and diatoms in the trap environment, show ability to hydrolyze phosphomonoseters. We suggest that algae in carnivorous plant traps can compete with plant (host for organic phosphate (phosphomonoseters. From the spectrum and ecological requirements of algal species found in the traps, environment inside the traps seems to be acidic. However, further studies are needed to test the relations between algae and carnivorous plants both in laboratory conditions and in the natural environment. All the reported taxa are described briefly and documented with 74 LM and SEM micrographs.

  15. Conferencia Argentina de Educación Médica: agendas, aportes y temas Emergentes

    Directory of Open Access Journals (Sweden)

    María Eugenia Brissón

    Full Text Available Propósito: En el presente trabajo se pretende identificar en las Conferencias Argentinas de Educación Médica (CAEMs cuáles son los temas que -en relación a la formación de médicos- se han debatido, los que ocupan la agenda actual y los emergentes, así como establecer algunas relaciones con el movimiento internacional en ese campo, en los últimos veinte años. Material y método: Se trata de un estudio descriptivo del período 1985 - 2003. Se realizaron análisis de programas y resúmenes presentados (CAEMs 1999, 2000, 2001, 2002, 2003, búsquedas no sistemáticas en Internet, revisión documental y consultas a informantes claves. Resultados: Temas en debate: admisión; evaluación y acreditación; cambios curriculares; selección, formación y evaluación del cuerpo docente y evaluación de la calidad de los egresados. Temas emergentes: asuntos de la agenda mundial son apenas incipientes en los debates de las CAEMs. Relaciones con el movimiento internacional: conformación de asociaciones sin fines de lucro para el desarrollo de la educación médica, participación en reuniones internacionales, desarrollo de proyectos de investigaciones, fortalecimiento de la formación de postgrado y legislación de aplicación en el campo de la educación médica. Conclusiones: Existencia de contribuciones mutuas entre el pensamiento latinoamericano en educación médica y el global. En Argentina la expansión de la educación médica ha sido apreciable en los últimos veinte años. Las CAEM han servido como ámbito de convocatoria, discusión y difusión de las cuestiones de la agenda general y de temas particulares del país. Ha dado lugar al establecimiento de líneas de actividades y al inicio de investigaciones. En general, si bien prevalece una discusión basada en opiniones, se advierte, en el transcurso de los años, un mejoramiento de la calidad de las comunicaciones y de los trabajos presentados.

  16. Advances in genetic engineering of marine algae.

    Science.gov (United States)

    Qin, Song; Lin, Hanzhi; Jiang, Peng

    2012-01-01

    Algae are a component of bait sources for animal aquaculture, and they produce abundant valuable compounds for the chemical industry and human health. With today's fast growing demand for algae biofuels and the profitable market for cosmetics and pharmaceuticals made from algal natural products, the genetic engineering of marine algae has been attracting increasing attention as a crucial systemic technology to address the challenge of the biomass feedstock supply for sustainable industrial applications and to modify the metabolic pathway for the more efficient production of high-value products. Nevertheless, to date, only a few marine algae species can be genetically manipulated. In this article, an updated account of the research progress in marine algal genomics is presented along with methods for transformation. In addition, vector construction and gene selection strategies are reviewed. Meanwhile, a review on the progress of bioreactor technologies for marine algae culture is also revisited. Copyright © 2012 Elsevier Inc. All rights reserved.

  17. Cars will be fed on algae

    International Nuclear Information System (INIS)

    Peltier, G.

    2012-01-01

    The development of the first and second generations of bio-fuels has led to a rise in food prices and the carbon balance sheet is less good than expected. Great hopes have been put on unicellular algae for they can synthesize oils, sugar and even hydrogen and the competition with food production is far less harsh than with actual bio-fuels. Moreover, when you grow micro-algae, the loss of water through evaporation is less important than in the case of intensive farm cultures. In 2009 10.000 tonnes of micro-algae were produced worldwide, they were mainly used for the production of fish food and of complements for humane food (fat acids and antioxidants). Different research programs concern unicellular algae: they aim at modifying micro-algae genetically in order to give them a higher productivity or to make them produce an oil more adapted for motor fuel or more easily recoverable. (A.C.)

  18. Potential biomedical applications of marine algae.

    Science.gov (United States)

    Wang, Hui-Min David; Li, Xiao-Chun; Lee, Duu-Jong; Chang, Jo-Shu

    2017-11-01

    Functional components extracted from algal biomass are widely used as dietary and health supplements with a variety of applications in food science and technology. In contrast, the applications of algae in dermal-related products have received much less attention, despite that algae also possess high potential for the uses in anti-infection, anti-aging, skin-whitening, and skin tumor treatments. This review, therefore, focuses on integrating studies on algae pertinent to human skin care, health and therapy. The active compounds in algae related to human skin treatments are mentioned and the possible mechanisms involved are described. The main purpose of this review is to identify serviceable algae functions in skin treatments to facilitate practical applications in this high-potential area. Copyright © 2017 Elsevier Ltd. All rights reserved.

  19. Streptophyte algae and the origin of embryophytes.

    Science.gov (United States)

    Becker, Burkhard; Marin, Birger

    2009-05-01

    Land plants (embryophytes) evolved from streptophyte green algae, a small group of freshwater algae ranging from scaly, unicellular flagellates (Mesostigma) to complex, filamentous thalli with branching, cell differentiation and apical growth (Charales). Streptophyte algae and embryophytes form the division Streptophyta, whereas the remaining green algae are classified as Chlorophyta. The Charales (stoneworts) are often considered to be sister to land plants, suggesting progressive evolution towards cellular complexity within streptophyte green algae. Many cellular (e.g. phragmoplast, plasmodesmata, hexameric cellulose synthase, structure of flagellated cells, oogamous sexual reproduction with zygote retention) and physiological characters (e.g. type of photorespiration, phytochrome system) originated within streptophyte algae. Phylogenetic studies have demonstrated that Mesostigma (flagellate) and Chlorokybus (sarcinoid) form the earliest divergence within streptophytes, as sister to all other Streptophyta including embryophytes. The question whether Charales, Coleochaetales or Zygnematales are the sister to embryophytes is still (or, again) hotly debated. Projects to study genome evolution within streptophytes including protein families and polyadenylation signals have been initiated. In agreement with morphological and physiological features, many molecular traits believed to be specific for embryophytes have been shown to predate the Chlorophyta/Streptophyta split, or to have originated within streptophyte algae. Molecular phylogenies and the fossil record allow a detailed reconstruction of the early evolutionary events that led to the origin of true land plants, and shaped the current diversity and ecology of streptophyte green algae and their embryophyte descendants. The Streptophyta/Chlorophyta divergence correlates with a remarkably conservative preference for freshwater/marine habitats, and the early freshwater adaptation of streptophyte algae was a major

  20. Una gramática emergente ¿internet como cultura o artefacto?

    Directory of Open Access Journals (Sweden)

    Mireya Barón Pulido

    2012-12-01

    Full Text Available Nativos digitales, gramáticas emergentes, internet como cultura y como artefacto son referentes marco que dinamizan tanto la emisión como la interpretación de signos en la población universitaria. El artículo muestra los resultados de las tendencias de usos de los lenguajes y mediaciones TICS en jóvenes universitarios de primer semestre del Politécnico Grancolombiano-COLOMBIA a partir del trabajo con grupos focales y aplicación de instrumento, con el propósito de sistematizar la tendencia de esta semiosis y su relación con el escenario pedagógico en la educación superior. Por demás, la investigación logra hacer un estado de arte de los resultados-casos en América Latina y Europa ante la realidad sígnica TICS y actores universitarios.

  1. ALERTA DE TECNOLOGIAS NOVAS E EMERGENTES: O DESAFIO DE INFORMAR A SOCIEDADE

    Directory of Open Access Journals (Sweden)

    Pollyanna Teresa Cirilo Gomes

    2015-10-01

    Full Text Available O monitoramento do Horizonte Tecnológico (MHT é uma etapa específica da Avaliação de Tecnologias em Saúde. Este trabalho teve como objetivo construir um modelo de Alerta de MHT centrado na sociedade, nos gestores e nos profissionais de saúde, a fim de ser utilizado no âmbito do Ministério da Saúde. Para isso, foram pesquisados nos sítios eletrônicos das agências integrantes da EuroScan, informes e alertas de tecnologias em saúde novas e emergentes. A partir dessa busca, levou-se em consideração a relevância da informação, a rapidez na obtenção dos dados e a disponibilidade para a equipe elaboradora. Os Alertas de MHT poderão promover o acesso dos diferentes segmentos da sociedade a informações baseadas na melhor evidência científica disponível, e poderá auxiliar nos processos de tomada decisão em saúde.

  2. Educación y pedagogía desde la perspectiva del paradigma emergente

    Directory of Open Access Journals (Sweden)

    Omar Huertas Díaz

    2013-01-01

    Full Text Available Los contenidos que aquí se pretenden desarrollar abordan la relación existente entre la complejidad y sus sistemas de pensamiento, con las categorías de educación, pedagogía y cultura ciudadana, interre lación en la cual el derecho, la educación y la pedagogía se unen como un trinomio de fuerzas generadoras de una cultura ciudadana que desarrolle unos horizontes y calidad de vida diferente, pudiendo ser contrastada por cualquier ciudadano y ciudadana desde su compleja vivencia, lo cual permite el rescate de lo emergente para traducirlo en acciones renovadas que permanentemente transformen la realidad. Esta temática se aborda desarrollando de forma concreta el concepto de complejidad y su relación con la transdisciplina, para luego determinar cuál debería ser la aplicación de estos en la educación y la pedagogía y en específico la educación ciudadana, de manera que se replique de forma positiva en la comunidad y humanidad entera.

  3. LA INFLAMACIÓN COMO FACTOR CAUSAL EMERGENTE DE LA ENFERMEDAD CARDIOVASCULAR

    Directory of Open Access Journals (Sweden)

    T. Fernández-Mora

    2007-06-01

    Full Text Available La ateroesclerosis está involucrada en el desarrollo de la enfermedad cardiovascular, una de las principales enfermedades de morbimortalidad en el mundo. Se han determinado una serie de factores de riesgo, tanto clásicos como emergentes, implicados en el desarrollo de esta enfermedad. Recientes investigaciones han demostrado que la inflamación juega un papel clave en el desarrollo de la ateroesclerosis. Las células del sistema inmune se encuentran presentes en todos los estadios de las lesiones arterioescleróticasy sus moléculas efectoras pueden acelerar la progresión de las lesiones y orquestar los mecanismos de inflamación inducidos en los síndromes coronarios agudos. La evidencia crítica implica a mediadores de la inmunidad tanto innata como adquirida en los diferentes estados de la ateroesclerosis. Dentro de loscomponentes inmunes involucrados en el proceso de la ateroesclerosis se encuentran componentes celulares como macrófagos, linfocitos, células dendríticas, mastocitos, células NK; componentes humoralescomo anticuerpos, citocinas proinflamatorias y moduladoras de la respuesta inmune, complemento, proteínas de fase aguda; y otros componentes como moléculas de adhesión y de choque térmico. A partirdel esclarecimiento del papel del sistema inmune en el desarrollo de la arterioesclerosis, han surgido una serie de perspectivas diagnósticas y terapéuticas para la enfermedad cardiovascular.

  4. FRAGILIDADE POTENCIAL E EMERGENTE NA BACIA DO RIO DAS PEDRAS, GUARAPUAVA, PR - BRASIL

    Directory of Open Access Journals (Sweden)

    Paulo Eugênio Pachechenik

    2013-10-01

    Full Text Available O presente trabalho teve por objetivo delimitar a potencialidade do uso do solo para auxiliar no planejamento da exploração dos recursos naturais da bacia do rio das Pedras, situada no município de Guarapuava, Paraná, Brasil. Aplicou-se uma metodologia de análise empírica da fragilidade ambiental, digitalizando a área e rede de drenagem da bacia, e gerando-se, posteriormente, um modelo numérico do terreno, empregando programas especializados. A área da bacia apresenta fragilidade ambiental potencial entre as classes “média” e “alta”, com os usos do solo classificando-a na fragilidade ambiental emergente “muito baixa” e “baixa”. Os limites da potencialidade de uso do solo indicam que a bacia está protegida da erosão e os fatores de forma demonstram, para as atuais condições, que há “pequena” possibilidade de ocorrer enchentes.

  5. Algae biodiesel - a feasibility report

    Directory of Open Access Journals (Sweden)

    Gao Yihe

    2012-04-01

    Full Text Available Abstract Background Algae biofuels have been studied numerous times including the Aquatic Species program in 1978 in the U.S., smaller laboratory research projects and private programs. Results Using Molina Grima 2003 and Department of Energy figures, captial costs and operating costs of the closed systems and open systems were estimated. Cost per gallon of conservative estimates yielded $1,292.05 and $114.94 for closed and open ponds respectively. Contingency scenarios were generated in which cost per gallon of closed system biofuels would reach $17.54 under the generous conditions of 60% yield, 50% reduction in the capital costs and 50% hexane recovery. Price per gallon of open system produced fuel could reach $1.94 under generous assumptions of 30% yield and $0.2/kg CO2. Conclusions Current subsidies could allow biodiesel to be produced economically under the generous conditions specified by the model.

  6. Algae biodiesel - a feasibility report

    Science.gov (United States)

    2012-01-01

    Background Algae biofuels have been studied numerous times including the Aquatic Species program in 1978 in the U.S., smaller laboratory research projects and private programs. Results Using Molina Grima 2003 and Department of Energy figures, captial costs and operating costs of the closed systems and open systems were estimated. Cost per gallon of conservative estimates yielded $1,292.05 and $114.94 for closed and open ponds respectively. Contingency scenarios were generated in which cost per gallon of closed system biofuels would reach $17.54 under the generous conditions of 60% yield, 50% reduction in the capital costs and 50% hexane recovery. Price per gallon of open system produced fuel could reach $1.94 under generous assumptions of 30% yield and $0.2/kg CO2. Conclusions Current subsidies could allow biodiesel to be produced economically under the generous conditions specified by the model. PMID:22540986

  7. Alcoolismo: Um problema social em assentamentos rurais

    Directory of Open Access Journals (Sweden)

    Marcelo Leles Romarco de Oliveira

    2012-06-01

    Full Text Available Este artigo procura fazer algumas reflexões a cerca do alcoolismo em assentamentos rurais, no município de Padre Bernardo-GO. O interesse em estudar esse tema foi a partir da observação de campo em diversas comunidades rurais do país, onde percebi que o uso do álcool trouxe sérios problemas para as famílias que têm algum membro que sofre do alcoolismo. Desta forma, os dados apresentados nesse trabalho são frutos de trabalhos de campo realizados entre os anos de 2001 e 2006. Como caminho para a coleta das informações optei pela observação e análise do dia-dia de um grupo de alcoólatras no assentamento Vereda I. Os resultados apresentaram que o álcool além de ser uma doença crônica, o seu uso é uma forma de fuga para os assentados. Igualmente, percebi que a ausência de políticas públicas que combata o alcoolismo corrobora para a gravidade da situação, culminando com agravamento das condições de vida do alcoólatra e de suas famílias.

  8. FUENTES ENERGÉTICAS Y PROBLEMAS AMBIENTALES

    Directory of Open Access Journals (Sweden)

    Antonio Sánchez Ogallar

    2006-12-01

    Full Text Available En esta comunicación se propone una estrategia didáctica organizada en tomo a dos grandes núcleos. El primero, La energía, requiere un planteamiento descriptivo orientado a la obtención de una visión global del problema energético. A continuación se pasa a abordar el otro núcleo: El cambioclimático. Este se enfoca desde un punto de vista más analítico y exige un amplio despliegue metodológico, con actividades de comprensión, de expresión y de valoración. Las actividades son consideradas como pasos previos para continuar un itinerario formativo para que el alumnado realice una construcción personal del entramado conceptual. Para ello se proponen procesos de profundización en aspectos más específicos. Además, se pretende que los alumnos elaboren un criterio propio respecto a las relaciones Humanidad-Naturaleza en general y, muy especialmente, respecto a la incidencia de las actividades humanas sobre el clima.

  9. O problema indígena

    Directory of Open Access Journals (Sweden)

    Egon Schaden

    1960-07-01

    Full Text Available Lembro-me muitas vêzes de uma conversa que, em janeiro de 1949, já lá vão dez anos, tive com o velho General Rondon. Trocávamos idéias sôbre a melhor maneira de se ajudarem os índios brasileiros a se incorporarem à nacionalidade ou, por outra, de se lhes garantir um lugar ao sol. O que mais admiração ,me causava no ancião era a sua juventude de espírito, a sua capacidade de rever e de refazer opiniões defendidas com ardor durante decênios de sua vida. Chegara à convicção de que já não se deveria nacionalizar os índios, o que, afirmava, "cria problemas graves e desajustamentos", mas preservar as culturas tribais, tomando por base os padrões econômicos de cada uma delas, para se fomentar uma atividade de produção que, sem ser revolucionária, lhes proporcionasse os meios necessários para se integrarem à vida econômica das regiões em que vivem.

  10. El problema de Alhacén

    Directory of Open Access Journals (Sweden)

    Cardona Suárez, Carlos Alberto

    2012-06-01

    Full Text Available This paper deals with the problem that Alhazen formulated and solved in book V of his treatise on optics. That is to say, finding the reflection point in a given mirror, when the positions of both the object and the observer are known. The intention is to, firstly, exhibit the complex argumentation scheme used by the Arabic scientist and philosopher; and secondly, propose a possible method of reasoning like a candidate exhibiting the logic of the theory which could lead to the discovery of the solution.

    El artículo se ocupa del problema que Alhacén formuló y resolvió en el libro V de su tratado de óptica. A saber, encontrar el punto de reflexión en un espejo dado, si se conocen las posiciones del objeto y del observador. Se pretende, primero, exponer el complejo esquema de argumentación usado por el filósofo y científico árabe, y segundo, proponer un posible esquema de razonamiento como un candidato que exhibe la lógica del descubrimiento.

  11. Method and apparatus for processing algae

    Science.gov (United States)

    Chew, Geoffrey; Reich, Alton J.; Dykes, Jr., H. Waite; Di Salvo, Roberto

    2012-07-03

    Methods and apparatus for processing algae are described in which a hydrophilic ionic liquid is used to lyse algae cells. The lysate separates into at least two layers including a lipid-containing hydrophobic layer and an ionic liquid-containing hydrophilic layer. A salt or salt solution may be used to remove water from the ionic liquid-containing layer before the ionic liquid is reused. The used salt may also be dried and/or concentrated and reused. The method can operate at relatively low lysis, processing, and recycling temperatures, which minimizes the environmental impact of algae processing while providing reusable biofuels and other useful products.

  12. Errors When Extracting Oil from Algae

    Science.gov (United States)

    Murphy, E.; Treat, R.; Ichiuji, T.

    2014-12-01

    Oil is in popular demand, but the worldwide amount of oil is decreasing and prices for it are steadily increasing. Leading scientists have been working to find a solution of attaining oil in an economically and environmentally friendly way. Researchers at the U.S. Department of Energy's Pacific Northwest National Laboratory (PNNL) have determined that "a small mixture of algae and water can be turned into crude oil in less than an hour" (Sheehan, Duhahay, Benemann, Poessler). There are various ways of growing the algae, such as closed loop and open loop methods, as well as processes of extracting oil, such as hydrothermal liquefaction and the hexane-solvent method. Our objective was to grow the algae (C. reinhardtii) and extract oil from it using NaOH and HCl, because we had easy access to those specific chemicals. After two trials of attempted algae growth, we discovered that a bacteria was killing off the algae. This led us to further contemplation on how this dead algae and bacteria are affecting our environment, and the organisms within it. Eutrophication occurs when excess nutrients stimulate rapid growth of algae in an aquatic environment. This can clog waterways and create algal blooms in blue-green algae, as well as neurotoxic red tide phytoplankton. These microscopic algae die upon consumption of the nutrients in water and are degraded by bacteria. The bacteria respires and creates an acidic environment with the spontaneous conversion of carbon dioxide to carbonic acid in water. This process of degradation is exactly what occurred in our 250 mL flask. When the phytoplankton attacked our algae, it created a hypoxic environment, which eliminated any remaining amounts of oxygen, carbon dioxide, and nutrients in the water, resulting in a miniature dead zone. These dead zones can occur almost anywhere where there are algae and bacteria, such as the ocean, and make it extremely difficult for any organism to survive. This experiment helped us realize the

  13. 21 CFR 73.275 - Dried algae meal.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 1 2010-04-01 2010-04-01 false Dried algae meal. 73.275 Section 73.275 Food and... ADDITIVES EXEMPT FROM CERTIFICATION Foods § 73.275 Dried algae meal. (a) Identity. The color additive dried algae meal is a dried mixture of algae cells (genus Spongiococcum, separated from its culture broth...

  14. 21 CFR 73.185 - Haematococcus algae meal.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 1 2010-04-01 2010-04-01 false Haematococcus algae meal. 73.185 Section 73.185... COLOR ADDITIVES EXEMPT FROM CERTIFICATION Foods § 73.185 Haematococcus algae meal. (a) Identity. (1) The color additive haematococcus algae meal consists of the comminuted and dried cells of the alga...

  15. Competencia, problemas internalizantes y problemas externalizantes en cuatro grupos de adolescentes

    OpenAIRE

    Oliveira-Monteiro, Nancy Ramacciotti de [UNIFESP; Nascimento, Juliana Olivetti Guimarães [UNIFESP; Montesano, Fábio Tadeu [UNIFESP; Aznar-Farias, Maria [UNIFESP

    2013-01-01

    Competências e disfunções emergem de interações indivíduo/ambiente, durante o desenvolvimento humano. O estudo teve por objetivo caracterizar perfis de competência e de problemas psicológicos em 160 adolescentes (11-18 anos) nos grupos: 1) estudantes de escola pública em tempo integral (TI); 2) estudantes assistidos por equipamento sociocultural (AC); 3) abrigados (AB); e 4) adolescentes grávidas/mães (GM). Os dados foram colhidos por autorreferência através do YSR, em seus itens de Competênc...

  16. Algae: putting carbon dioxide in a bind

    Energy Technology Data Exchange (ETDEWEB)

    Ewers, J.; Wiechers, G. [RWE Power (Germany)

    2009-03-15

    German utility RWE Power has initiated a cutting edge project that is investigating the use of marine microalgae to capture carbon dioxide produced during lignite combustion. At its Niederaussem power plant, a pilot plant has been erected for the production of microalgae. Flue gas is withdrawn from the lignite-based power plant and transported through polyethylene pipes to the microalgae production plant. The CO{sub 2} in the flue gas is dissolved in the algae suspension and adsorbed by the algae for growth in photobioreactors, developed by Noragreen Projektmanagement GmbH. The photobioreactors which consist of clear plastic hoses, fixed in V shape to supports. The study is aiming to optimise the entire algae production process and subsequent conversion and use of the algae biomass produced. Uses being investigated include hydrothermal carbonization to obtain hydrocarbon products. 1 figs., 1 photo.

  17. The Biology of blue-green algae

    National Research Council Canada - National Science Library

    Carr, Nicholas G; Whitton, B. A

    1973-01-01

    .... Their important environmental roles, their part in nitrogen fixation and the biochemistry of phototrophic metabolism are some of the attractions of blue-geen algae to an increasing number of biologists...

  18. Collection, Isolation and Culture of Marine Algae.

    Science.gov (United States)

    James, Daniel E.

    1984-01-01

    Methods of collecting, isolating, and culturing microscopic and macroscopic marine algae are described. Three different culture media list of chemicals needed and procedures for preparing Erdschreiber's and Provasoli's E. S. media. (BC)

  19. 2011 Biomass Program Platform Peer Review: Algae

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Joyce [Office of Energy Efficiency and Renewable Energy (EERE), Washington, DC (United States)

    2012-02-01

    This document summarizes the recommendations and evaluations provided by an independent external panel of experts at the 2011 U.S. Department of Energy Biomass Program’s Algae Platform Review meeting.

  20. Dipeptides from the red alga Acanthopora spicifera

    Digital Repository Service at National Institute of Oceanography (India)

    Wahidullah, S; De; Kamat, S

    An investigation of red alga Acanthophora spicifera afforded the known peptide, aurantiamide acetate and a new diastereoisomer of this dipeptide (dia-aurantiamide acetate). This is a first report of aurantiamide acetate from a marine source...

  1. Tecnologías emergentes para la conservación de alimentos sin calor

    Directory of Open Access Journals (Sweden)

    Fernández Molina, Juan José

    2001-01-01

    Full Text Available Not available

    Se han investigado los principios básicos de tres tecnologías emergentes para pasteurizar y esterilizar alimentos sin empleo del calor Mediante numerosos estudios se ha comprobado la efectividad de los campos eléctricos pulsantes de alta intensidad (CEPAI, los pulsos de luz (PL y los campos magnéticos oscilantes (CMO en la destrucción de microorganismos y enzimas de sistemas alimentarios. En la inactivación microbiana por CEPA!, el blanco principal es la membrana celular que, al ser sometida a campos eléctricos de alta intensidad, se hace permeable formando huecos o poros cuyo tamaño se incrementa a medida que aumenta la intensidad del campo eléctrico o el tiempo de tratamiento o se reduce la resistencia iónica del medio de pulsación. Por otra parte, los PL inducen reacciones fotoquímicas y fototérmicas en los alimentos, causando la muerte de gran cantidad de microorganismos, especialmente en productos alimenticios envasados. Los CMO producen simulación o inhibición en el crecimiento y reproducción de los microorganismos, un simple pulso de intensidad de 5-10 teslas y frecuencias de 5-500 kHz es suficiente para reducir el número de microorganismos en un mínimo de 2 ciclos logarítmicos. Se ha comprobado que estas tecnologías alargan la vida de anaquel de diversos productos alimenticios y pueden ser consideradas como sustitutos parciales de los procesos convencionales de pasteurización y esterilización de alimentos por tratamientos térmicos.

  2. Stochastic Forecasting of Algae Blooms in Lakes

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Peng; Tartakovsky, Daniel M.; Tartakovsky, Alexandre M.

    2013-01-03

    We consider a general framework to predict the development of harmful algal blooms (HABs) in a lake driven by uncertain parameters. To quantify the concentration uncertainty of those algae groups via their joint probabilistic density function (PDF), we explore an approach based on the Fokker-Planck equation. Our result is presented in an example where abundant nutrients contribute to the proliferation of cyanobacteria and other minor algae groups.

  3. Utilizar las matemáticas para resolver problemas reales

    OpenAIRE

    Vicente Martín, Santiago; Dooren, Wim van; Verschaffel, Lieven

    2008-01-01

    En este trabajo de revisión se analizan las razones por las que los alumnos no son capaces de resolver problemas realistas utilizando conocimientos no matemáticos. Para ello se describen, en primer lugar, las investigaciones internacionales que han documentado estas dificultades en la resolución de problemas realistas. En segundo lugar, se describe cómo los libros de texto y la cultura del aula favorecen que los niños vayan aprendiendo de manera progresiva a resolver los problemas de matemáti...

  4. Biogas production experimental research using algae.

    Science.gov (United States)

    Baltrėnas, Pranas; Misevičius, Antonas

    2015-01-01

    The current study is on the the use of macro-algae as feedstock for biogas production. Three types of macro-algae, Cladophora glomerata (CG), Chara fragilis (CF), and Spirogyra neglecta (SN), were chosen for this research. The experimental studies on biogas production were carried out with these algae in a batch bioreactor. In the bioreactor was maintained 35 ± 1°C temperature. The results showed that the most appropriate macro-algae for biogas production are Spirogyra neglecta (SN) and Cladophora glomerata (CG). The average amount of biogas obtained from the processing of SN - 0.23 m(3)/m(3)d, CG - 0.20 m(3)/m(3)d, and CF - 0.12 m(3)/m(3)d. Considering the concentration of methane obtained during the processing of SN and CG, which after eight days and until the end of the experiment exceeded 60%, it can be claimed that biogas produced using these algae is valuable. When processing CF, the concentration of methane reached the level of 50% only by the final day of the experiment, which indicates that this alga is less suitable for biogas production.

  5. Antioxidant Activity of Hawaiian Marine Algae

    Directory of Open Access Journals (Sweden)

    Anthony D. Wright

    2012-02-01

    Full Text Available Marine algae are known to contain a wide variety of bioactive compounds, many of which have commercial applications in pharmaceutical, medical, cosmetic, nutraceutical, food and agricultural industries. Natural antioxidants, found in many algae, are important bioactive compounds that play an important role against various diseases and ageing processes through protection of cells from oxidative damage. In this respect, relatively little is known about the bioactivity of Hawaiian algae that could be a potential natural source of such antioxidants. The total antioxidant activity of organic extracts of 37 algal samples, comprising of 30 species of Hawaiian algae from 27 different genera was determined. The activity was determined by employing the FRAP (Ferric Reducing Antioxidant Power assays. Of the algae tested, the extract of Turbinaria ornata was found to be the most active. Bioassay-guided fractionation of this extract led to the isolation of a variety of different carotenoids as the active principles. The major bioactive antioxidant compound was identified as the carotenoid fucoxanthin. These results show, for the first time, that numerous Hawaiian algae exhibit significant antioxidant activity, a property that could lead to their application in one of many useful healthcare or related products as well as in chemoprevention of a variety of diseases including cancer.

  6. Antioxidant activity of Hawaiian marine algae.

    Science.gov (United States)

    Kelman, Dovi; Posner, Ellen Kromkowski; McDermid, Karla J; Tabandera, Nicole K; Wright, Patrick R; Wright, Anthony D

    2012-02-01

    Marine algae are known to contain a wide variety of bioactive compounds, many of which have commercial applications in pharmaceutical, medical, cosmetic, nutraceutical, food and agricultural industries. Natural antioxidants, found in many algae, are important bioactive compounds that play an important role against various diseases and ageing processes through protection of cells from oxidative damage. In this respect, relatively little is known about the bioactivity of Hawaiian algae that could be a potential natural source of such antioxidants. The total antioxidant activity of organic extracts of 37 algal samples, comprising of 30 species of Hawaiian algae from 27 different genera was determined. The activity was determined by employing the FRAP (Ferric Reducing Antioxidant Power) assays. Of the algae tested, the extract of Turbinaria ornata was found to be the most active. Bioassay-guided fractionation of this extract led to the isolation of a variety of different carotenoids as the active principles. The major bioactive antioxidant compound was identified as the carotenoid fucoxanthin. These results show, for the first time, that numerous Hawaiian algae exhibit significant antioxidant activity, a property that could lead to their application in one of many useful healthcare or related products as well as in chemoprevention of a variety of diseases including cancer.

  7. Fluorescence Properties of Chlorella sp. Algae

    Directory of Open Access Journals (Sweden)

    Tibor Teplicky

    2017-01-01

    Full Text Available Water quality and its fast and reliable monitoring is the challenge of the future. Design of appropriate biosensors that would be capable of non-invasive identification of water pollution is an important prerequisite for such challenge. Chlorophylls are pigments, naturally presented in all plants that absorb light. The main forms of chlorophyll in algae are chlorophyll a and chlorophyll b, other pigments include xantophylls and beta-carotenes. Our aim was to characterize endogenous fluorescence of the Chlorella sp. algae, present naturally in drinking water. We recorded spatial, spectral and lifetime fluorescence distribution in the native algae. We noted that the fluorescence was evenly distributed in the algae cytosol, but lacked in the nucleus and reached maximum at 680-690 nm. Fluorescence decay of chlorella sp. was double-exponential, and clearly shorter than that of its isolated pigments. For the first time, fluorescence lifetime image of the algae is presented. Study of the fluorescence properties of algae is aimed at the improvement of water supply contamination detection and cleaning.

  8. La Gestión de Tecnologías Emergentes en el Ámbito Universitario

    Directory of Open Access Journals (Sweden)

    Claudia N. Jiménez-Hernández

    2011-06-01

    Full Text Available El carácter emergente de algunas tecnologías hace que tengan un alto grado de incertidumbre, lo que a su vez conlleva particularidades en su manejo respecto a las tecnologías maduras. El objetivo de este artículo es analizar la gestión de tecnologías emergentes en el contexto internacional, con énfasis en el ámbito universitario; para ello, se aplican técnicas cienciométricas a información obtenida de bases de datos de artículos científicos y técnicos. Así mismo, se examina el papel de las universidades, para lo cual se hace un análisis comparativo de algunos casos de reconocido impacto en el nivel mundial. Entre los resultados obtenidos está la identificación de áreas relevantes como la nanotecnología y la telefonía móvil, y la caracterización del manejo de las tecnologías emergentes en las universidades seleccionadas. Esto da la base para plantear algunas conclusiones y consideraciones, como la necesidad de que las universidades colombianas lideren el desarrollo tecnológico en el país promoviendo su impacto en el sector productivo, para lo cual requieren consolidar estructuras y políticas claras en el tema, así como una cultura en propiedad intelectual.

  9. Vinculación del residente de Higiene y Epidemiología a actividades epidemiológicas emergentes

    Directory of Open Access Journals (Sweden)

    Luis Larios Ortiz

    Full Text Available Fundamento: El currículo de estudios, principalmente de posgrado, no puede considerarse como un plan al que hay que ajustarse de manera estricta, sino que debe ser más flexible, que dé salida a los objetivos propuestos según las situaciones del entorno. Objetivo: mostrar algunos resultados de la vinculación del residente de Higiene y Epidemiología a actividades epidemiológicas emergentes en la actualidad. Método: se realizó un estudio descriptivo transversal en el Centro Provincial de Higiene, Epidemiología y Microbiología de Camagüey durante junio de 2014. Se entrevistó a un universo de 32 profesionales (25 especialistas y 7 residentes. Las variables utilizadas fueron: utilidad de la vinculación extracurricular a programas y tareas de control epidemiológico, desarrollo práctico de los aspectos teóricos, vencimiento con calidad del diseño curricular de la residencia y si se consideró necesario o no interrumpir el plan de estudios ante eventos epidemiológicos de emergencia. Resultados: La mayoría de los especialistas consideró que la vinculación a actividades específicas le permitió vencer con calidad el plan de estudios, mientras que el mayor porcentaje de los residentes no lo estimó así. Ningún residente entrevistado estuvo de acuerdo con la interrupción del plan de estudios ante situaciones emergentes. Conclusiones: la vinculación del residente a actividades prácticas emergentes puede servir de incentivo para la graduación de un especialista con mayor competencia profesional, sin abandonar el diseño curricular establecido.

  10. Turismo gay: Análisis de una modalidad turística emergente en la ciudad de Sevilla

    OpenAIRE

    Noguera Cordero, Jorge; Jiménez Caballero, José Luis (Coordinador)

    2016-01-01

    El trabajo hace una aproximación a una modalidad turística emergente: el turismo gay. El cambio antropológico experimentado por la sociedad española en relación con esta orientación sexual repercute directamente en el despegue del turismo gay, a través de una mayor visibilidad, y en la creación de destinos especializados hacia esta demanda. Primeramente se profundiza sobre el concepto “Homosexualidad”, considerando de qué manera afecta a la sociedad, y de forma más concret...

  11. Una aproximación a la militancia partidista en México: el caso de los partidos emergentes

    OpenAIRE

    Aldo Muñoz-Armenta

    2013-01-01

    El artículo tiene como propósito examinar el estado actual de la militancia partidista en México, en particular en cuatro de los partidos emergentes: Partido Verde Ecologista de México (PVEM), Partido del Trabajo (PT), Convergencia (a partir del 31 de julio de 2011cambió su nombre por el de Movimiento Ciudadano) y Partido Nueva Alianza (PANAL). La idea es conocer el tipo de motivaciones que la militancia de estas organizaciones tiene para participar en sus tareas, sean o no remuneradas. Para ...

  12. Proceso de Formulación de Estrategias Emergentes en el Colegio de Bachilleres de Chiapas Plantel 16

    OpenAIRE

    López Constantino, César

    2016-01-01

    El trabajo desarrollado aborda la formulación de estrategias emergentes en el plantel 16 “Ocosingo” del Colegio de Bachilleres de Chiapas, durante los semestres 2013-A y 2013B. La pregunta de investigación indaga acerca de cómo se lleva a cabo el proceso de formulación de dichas estrategias. Proceso en el que juega un papel importante la planeación formal, en donde se definen las estrategias deliberadas y a partir de aquellas que no logran implementarse con éxito o de situaciones imprevistas,...

  13. Vozes emergentes: uma leitura do romance "Um rio chamado tempo, uma casa chamada terra", de Mia Couto

    OpenAIRE

    Santos, Jos? Benedito dos

    2013-01-01

    O presente trabalho tem como objetivo analisar as vozes emergentes da cultura de matriz iorub? e banta no romance Um rio chamado tempo, uma casa chamada terra (2003), especificamente analisar a recria??o de alguns mitos africanos nessa obra de Mia Couto, por meio do dialogismo entre os mitos criados pelos povos de l?ngua iorub? e banta e aqueles cultuados pelas personagens ficcionais de Mia Couto, especialmente nos aspectos ritual?sticos e nos meios adotados para a transmiss?o da tradi??o ora...

  14. Procesos de tratamiento de aguas residuales para la eliminación de contaminantes orgánicos emergentes

    OpenAIRE

    Clemente,Ainhoa Rubio; Chica Arrieta,Edwin Lenin; Peñuela Mesa,Gustavo Antonio

    2013-01-01

    Los contaminantes orgánicos emergentes conforman un grupo de sustancias muy heterogéneas, cuya característica en común es que causan efectos negativos sobre los organismos acuáticos, por lo que deben de ser eliminados del ambiente. Lamentablemente, los procesos convencionales con los que operan las plantas de tratamiento de aguas residuales, especialmente los de tipo biológico, son ineficientes en la remoción de estas sustancias. Por este motivo, se hace necesaria la evaluación y optimización...

  15. Culturas juveniles, demandas del mercado y prácticas profesionales emergentes

    OpenAIRE

    Di Capua Arlegain, Analía

    2009-01-01

    Los profesores se enfrentan hoy -por exigencias de la realidad y las transformaciones planteadas desde la política educativa- con nuevos problemas y obligaciones que amplían, intensifican y complejizan su trabajo de manera que la tarea esencial que identifica al quehacer docente ya no se limita a “dar clase”. En Educación Física, frente a una agenda temática de aumento del rendimiento físico, deportistas de competencia, prácticas motrices hegemónicas ligadas al imaginario de la modernidad (un...

  16. Sobre o problema da demarcação

    Directory of Open Access Journals (Sweden)

    Marcos Barbosa de Oliveira

    1982-12-01

    Full Text Available Desde sua publicação, não têm faltado ataques ao critério da refutabilidade - a solução proposta por Popper para seu problema da demarcação. A crítica do presente artigo é mais fundamental: seu alvo é o próprio problema da demarcação. Como preliminar, mostra-se haver na obra de Popper não apenas um, mas dois problemas da demarcação, distintos e incompatíveis. Uma análise do antiessencialismo de Popper é o ponto de partida para a demonstração da tese central do artigo, a saber, a tese de que o problema da demarcação deve ser abandonado, por ser parte de uma abordagem cientificista da questão do valor das ciências.

  17. Hyperspectral imaging of snow algae and green algae from aeroterrestrial habitats

    Science.gov (United States)

    Holzinger, Andreas; Allen, Michael C.; Deheyn, Dimitri D.

    2016-01-01

    Snow algae and green algae living in aeroterrestrial habitats are ideal obbjects to study adaptation to high light irradiation. Here, we used a detailed description of the spectral properties as a proxy for photo-acclimation/protection in snow algae (Chlamydomonas nivalis, Chlainomonas sp. and Chloromonas sp.) and charopyhte green algae (Zygnema sp., Zygogonium ericetorum and Klebsormidium crenulatum). The hyperspectral microscopic mapping and imaging technique allowed us to acquire total absorbance spectra of these microalgae in the waveband of 400-900 nm. Particularly in Chlamydomonas nivalis and Chlainomonas sp., a high absorbance in the wave band of 400-550 nm was observed, due to naturally occurring secondary carotenoids; in Chloromonas sp. and in the charopyhte algae this was missing, the latter being close relatives to land plants. To investigate if cellular water loss has an influence on the spectral properties, the cells were plasmolysed in sorbitol or desiccated at ambient air. While in snow algae, these treatments did not change the spectral properties, in the charopyhte algae the condensation of the cytoplasm and plastids increased the absorbance in the lower waveband of 400 – 500 nm. These changes might be ecologically relevant and photoprotective, as aeroterrestrial algae are naturally exposed to occasional water limitation, leading to desiccation, which are conditions usually occurring together with higher irradiation. PMID:27442511

  18. Hyperspectral imaging of snow algae and green algae from aeroterrestrial habitats.

    Science.gov (United States)

    Holzinger, Andreas; Allen, Michael C; Deheyn, Dimitri D

    2016-09-01

    Snow algae and green algae living in aeroterrestrial habitats are ideal objects to study adaptation to high light irradiation. Here, we used a detailed description of the spectral properties as a proxy for photo-acclimation/protection in snow algae (Chlamydomonas nivalis, Chlainomonas sp. and Chloromonas sp.) and charophyte green algae (Zygnema sp., Zygogonium ericetorum and Klebsormidium crenulatum). The hyperspectral microscopic mapping and imaging technique allowed us to acquire total absorption spectra of these microalgae in the waveband of 400-900nm. Particularly in Chlamydomonas nivalis and Chlainomonas sp., a high absorbance between 400-550nm was observed, due to naturally occurring secondary carotenoids; in Chloromonas sp. and in the charopyhte algae this high absorbance was missing, the latter being close relatives to land plants. To investigate if cellular water loss has an influence on the spectral properties, the cells were plasmolysed in sorbitol or desiccated at ambient air. While in snow algae, these treatments did hardly change the spectral properties, in the charopyhte algae the condensation of the cytoplasm and plastids increased the absorbance in the lower waveband of 400-500nm. These changes might be ecologically relevant and photoprotective, as aeroterrestrial algae are naturally exposed to occasional water limitation, leading to desiccation, which are conditions usually occurring together with higher irradiation. Copyright © 2016 The Authors. Published by Elsevier B.V. All rights reserved.

  19. Radiation sterilization of harmful algae in water

    International Nuclear Information System (INIS)

    Byung Chull An; Jae-Sung Kim; Seung Sik Lee; Shyamkumar Barampuram; Eun Mi Lee; Byung Yeoup Chung

    2007-01-01

    Complete text of publication follows. Objective: Drinking water, water used in food production and for irrigation, water for fish farming, waste water, surface water, and recreational water have been recently recognized as a vector for the transmission of harmful micro-organisms. The human and animal harmful algae is a waterborne risk to public health and economy because the algae are ubiquitous and persistent in water and wastewater, not completely removed by physical-chemical treatment processes, and relatively resistant to chemical disinfection. Gamma and electron beam radiation technology is of growing in the water industry since it was demonstrated that gamma and electron beam radiation is very effective against harmful algae. Materials and Methods: Harmful algae (Scenedesmus quadricauda(Turpin) Brebisson 1835 (AG10003), Chlorella vulgaris Beijerinck 1896 (AG30007) and Chlamydomonas sp. (AG10061)) were distributed from Korean collection for type cultures (KCTC). Strains were cultured aerobically in Allen's medium at 25□ and 300 umol/m2s for 1 week using bioreactor. We investigated the disinfection efficiency of harmful algae irradiated with gamma (0.05 to 10 kGy for 30 min) and electron beam (1 to 19 kGy for 5 sec) rays. Results and Conclusion: We investigated the disinfection efficiency of harmful algae irradiated with gamma and electron beam rays of 50 to 19000 Gy. We established the optimum sterilization condition which use the gamma and electron beam radiation. Gamma ray disinfected harmful algae at 400 Gy for 30 min. Also, electron beam disinfected at 1000 Gy for 5 sec. This alternative disinfection practice had powerful disinfection efficiency. Hence, the multi-barrier approach for drinking water treatment in which a combination of various disinfectants and filtration technologies are applied for removal and inactivation of different microbial pathogens will guarantee a lower risk of microbial contamination.

  20. Algae Biofuel in the Nigerian Energy Context

    Directory of Open Access Journals (Sweden)

    Elegbede Isa

    2016-05-01

    Full Text Available The issue of energy consumption is one of the issues that have significantly become recognized as an important topic of global discourse. Fossil fuels production reportedly experiencing a gradual depletion in the oil-producing nations of the world. Most studies have relatively focused on biofuel development and adoption, however, the awareness of a prospect in the commercial cultivation of algae having potential to create economic boost in Nigeria, inspired this research. This study aims at exploring the potential of the commercialization of a different but commonly found organism, algae, in Nigeria. Here, parameters such as; water quality, light, carbon, average temperature required for the growth of algae, and additional beneficial nutrients found in algae were analysed. A comparative cum qualitative review of analysis was used as the study made use of empirical findings on the work as well as the author’s deductions. The research explored the cultivation of algae with the two major seasonal differences (i.e. rainy and dry in Nigeria as a backdrop. The results indicated that there was no significant difference in the contribution of algae and other sources of biofuels as a necessity for bioenergy in Nigeria. However, for an effective sustainability of this prospect, adequate measures need to be put in place in form of funding, provision of an economically-enabling environment for the cultivation process as well as proper healthcare service in the face of possible health hazard from technological processes. Further studies can seek to expand on the potential of cultivating algae in the Harmattan season.

  1. Prototecose: uma doença emergente Protothecosis: an emergent disease

    Directory of Open Access Journals (Sweden)

    Expedito K.A. Camboim

    2010-01-01

    Full Text Available Prototecose, causada por Prototheca zopfii ou P. wickerhamii, é uma doença emergente em animais e humanos. Em bovinos, P. zopfii é uma importante causa de mastite ambiental. Em cães e gatos, a prototecose é causada principalmente por P. zopfii. Em cães, causa infecção cutânea ou uma forma sistêmica envolvendo diversos órgãos. Em gatos, predominam as lesões tegumentares na região da face e plano nasal. No homem, a prototecose, causada principalmente por P. wickerhamii, manifesta-se sob três formas: cutânea, articular com bursite do olécrano e sistêmica. Pode ocorrer em indivíduos imunocompetentes, os quais podem apresentar bursite e/ou infecções cutâneas localizadas, ou em indivíduos imunossuprimidos, nos quais a enfermidade pode ser disseminada e/ou com envolvimento visceral. A prototecose causada por P. wickerhamii foi descrita recentemente em caprinos como causa de rinite afetando o vestíbulo nasal, união mucocutânea, pele da face e orelha. Nesta revisão são abordadas as características microbiologias e susceptibilidade a antimicrobianos do agente, e a epidemiologia, sinais clínicos, patologia, diagnóstico, tratamento e controle da prototecose em animais domésticos e no homem.Protothecosis, caused by Prototheca zopfii or P. wickerhamii, is an emergent disease of human and animals. In cattle, P. zopfii is an important cause of environmental mastitis. In dogs and cats protothecosis is caused mainly by P. zopfii, causing cutaneous infections or a systemic form affecting many organs in dogs, and cutaneous infection affecting mainly the skin of the face and nose in cats. In humans, protothecosis, caused mainly by P. wickerhamii, occurs in three forms: cutaneous; olecran bursitis; and disseminated. The lesion is usually localized in the site of inoculation in immunocompetent individuals; however, in immunocompromised patients, it can become widespread. Protothecosis caused by P. wickerhamii was recently reported in

  2. Web Analytics: Modelos de Métricas de Engajamento em Mídias Emergentes

    Directory of Open Access Journals (Sweden)

    Sionara Ioco Okada

    2012-02-01

    Full Text Available As transformações no comportamento do consumidor inauguraram a “Era da recomendação com a disseminação exponencial de conteúdo relevante, ascensão do prosumerismo e crowdsourcing. A mensuração e o monitoramento contínuo das ações mercadológicas levam ao conhecimento do comportamento do consumidor, não somente nas variáveis como freqüência, recência e valor de compra, mas também nos quesitos engajamento e interação com o produto e/ou marca. O desenvolvimento de métricas para múltiplas mídias elevam a quantidade de informações úteis sobre o perfil de consumo possibilitando a otimização das estratégias digitais à públicos segmentados. Este é um artigo de atualização que tem por objetivo revisar as últimas publicações sobre modelos de métricas - web analytics – WA coadunando estratégias digitais em plataformas e mídias emergentes. Quanto à metodologia utilizada, trata-se de uma investigação secundária, sobretudo bibliográfica visando à atualização e análise comparativa de três modelos web analytics – wa para organizações que atuam no varejo eletrônico, utilizando diferentes canais digitais. O estudo enfoca: i Modelo dos Cinco Estágios de competição analítica, proposto por Davenport; ii Modelo de maturidade em web analytics, proposto por Hammel; iii Modelo Web Analytics Scorecard, proposto por Giuntini & Morier. A expansão do M-commerce e o advento do Social commerce assumem-se como tendências irreversíveis, exigindo das organizações que atuam no varejo eletrônico, métricas e indicadores de desempenho para um monitoramento contínuo do comportamento do consumidor, de modo a consolidar a interação e as métricas de engajamento como principais protagonistas das estratégias digitais contemporâneas. DOI: 10.5585/remark.v10i3.2271

  3. Solución al Problema de Secuenciación de Trabajos mediante el Problema del Agente Viajero

    Directory of Open Access Journals (Sweden)

    G.E. Anaya Fuentes

    2016-10-01

    Full Text Available Resumen: En este trabajo se estudia el Problema de Secuenciación de Trabajos codificado como un Problema de Agente Viajero y resuelto mediante Algoritmos Genéticos. Se propone un Algoritmo Genético en donde se comparan dos tipos de selección: por torneo y por ruleta. Se realizan diferentes pruebas para la solución del Problema del Agente Viajero con los dos tipos de selección bajo diferentes parámetros: número de individuos, número de iteraciones, probabilidad de cruce y probabilidad de mutación; a partir de estos se seleccionan los parámetros y el tipo de selección. Posteriormente se codifica al Problema de Secuenciación como un Problema del Agente Viajero. La propuesta se presenta mediante la aplicación a diferentes ejemplos del Problema de Secuenciación de Trabajos y la comparación con los resultados obtenidos en la literatura. Abstract: In this paper we proposed a solution to the Job-Shop Scheduling Problem using the Traveling Salesman Problem solved by Genetic Algorithms. We proposed a genetic algorithm where we compare two types of selection: tournament and roulette. Different tests are performed to solve the Traveling Salesman Problem with the two types of selection under different parameters: number of individuals, number of iterations, crossover probability and mutation probability. Then the best type of selection and the best parameters are used to solve the Job-Shop Scheduling Problem with Genetic Algorithms for the Traveling Salesman Problem. The proposal is presented solving different examples of Job Sequencing Problem and compare them with the results obtained in the literature. Palabras clave: algoritmos eficientes, sistemas industriales de producción, problemas de optimización, problema de agente viajero, Keywords: Efficient algorithms, industrial production systems, optimization problem, traveling salesman problem

  4. La tasa de descuento en países emergentes aplicación al caso colombiano

    Directory of Open Access Journals (Sweden)

    Jairo Humberto Sánchez Segura

    2010-08-01

    Full Text Available La evaluación financiera se constituye en parte fundamental para determinar la viabilidad de los proyectos. En este proceso, el costo de capital se constituye en herramienta básica para medir no solo el retorno esperado, sino el riesgo percibido por los accionistas. A una mayor tasa esperada de retorno del capital, los proyectos serán más exigentes y requerirán mayores tasas de rentabilidad que recuperen la inversión y generen el retorno esperado por quienes asumen el riesgo de la financiación. Este artículo presenta dos modelos financieros utilizados para el cálculo del costo de capital y los ajustes necesarios para calcular dicho costo cuando se trata de inversiones en países emergentes. Parten ambos del modelo CAPM (Capital Assets Pricing Model o modelo de precios de activos de capital y desarrolla los ajustes necesarios para calcular el mayor riesgo percibido en países emergentes que finalmente se refleja en la tasa de descuento. Se aplicarán ambos modelos al caso colombiano para determinar el costo de capital en inversiones efectuadas en su territorio.

  5. Control borroso para la valoración del impacto ambiental generado por contaminantes emergentes en aguas residuales hospitalarias

    Directory of Open Access Journals (Sweden)

    Leadina Sánchez Barboza

    2015-06-01

    Full Text Available La valoración de impactos ambientales está sujeta a imprecisión, vaguedad y subjetividad. Estas características son extensivas al impacto generado por la presencia de contaminantes emergentes -fármacos- en aguas residuales hospitalarias, por lo que este trabajo propone valorar el impacto de dichos contaminantes mediante un sistema de inferencia borrosa, utilizando el toolbox fuzzy logic de MATLAB®, aplicando el sistema experto Mamdani. Los conjuntos borrosos de entrada se establecieron a partir de las concentraciones de los fármacos mediante variables lingüísticas definidas por medio de funciones de pertenencia trapezoidales, y el conjunto borroso de salida comprende la magnitud del impacto definida a través de una función de pertenencia triangular. Posteriormente, se obtuvo una valoración (en escala de 0 a 100 para concentraciones de fármacos máximas y promedios presentes en el agua residual, y por último, con estos valores se determina la magnitud del impacto ambiental a través del sistema de inferencia borrosa diseñado. El tratamiento borroso es útil para valorar los impactos ambientales en aguas residuales de contaminantes emergentes como los compuestos farmacéuticos.

  6. Los países emergentes en el G-20 y la política seguida por Argentina

    Directory of Open Access Journals (Sweden)

    Roberto Miranda

    2017-06-01

    Full Text Available En este artículo se analiza la presencia de los países emergentes en la gobernanza global a través de la participación desplegada por ellos en el G-20, con el fin de identificar la posición de Argentina en este ámbito multilateral, y determinar el uso que hizo de su poder como potencia media. Para cumplir con este objetivo consideramos las cumbres de jefes de Estado y de Gobierno del G-20, desde la primera realizada en Washington, en 2008, hasta la novena llevada a cabo en Brisbane, en 2014. Observamos que más allá de las diferencias y disputa de intereses, países desarrollados y emergentes convergieron en sostener las Viejas instituciones internacionales como el FMI. Argentina, de participación intensa en las cumbres pero sin una estrategia de influencia, quedó fuera de esta coincidencia y perdió poder en las reformas producidas en los medios multilaterales de crédito.

  7. Sustainable Algae Biodiesel Production in Cold Climates

    Directory of Open Access Journals (Sweden)

    Rudras Baliga

    2010-01-01

    Full Text Available This life cycle assessment aims to determine the most suitable operating conditions for algae biodiesel production in cold climates to minimize energy consumption and environmental impacts. Two hypothetical photobioreactor algae production and biodiesel plants located in Upstate New York (USA are modeled. The photobioreactor is assumed to be housed within a greenhouse that is located adjacent to a fossil fuel or biomass power plant that can supply waste heat and flue gas containing CO2 as a primary source of carbon. Model results show that the biodiesel areal productivity is high (19 to 25 L of BD/m2/yr. The total life cycle energy consumption was between 15 and 23 MJ/L of algae BD and 20 MJ/L of soy BD. Energy consumption and air emissions for algae biodiesel are substantially lower than soy biodiesel when waste heat was utilized. Algae's most substantial contribution is a significant decrease in the petroleum consumed to make the fuel.

  8. Biological toxicity of lanthanide elements on algae.

    Science.gov (United States)

    Tai, Peidong; Zhao, Qing; Su, Dan; Li, Peijun; Stagnitti, Frank

    2010-08-01

    The biological toxicity of lanthanides on marine monocellular algae was investigated. The specific objective of this research was to establish the relationship between the abundance in the seawater of lanthanides and their biological toxicities on marine monocellular algae. The results showed that all single lanthanides had similar toxic effects on Skeletonema costatum. High concentrations of lanthanides (29.04+/-0.61 micromol L(-1)) resulted in 50% reduction in growth of algae compared to the controls (0 micromol L(-1)) after 96 h (96 h-EC50). The biological toxicity of 13 lanthanides on marine monocellular algae was unrelated with the abundance of different lanthanide elements in nature, and the "Harkins rule" was not appropriate for the lanthanides. A mixed solution that contained equivalent concentrations of each lanthanide element had the same inhibition effect on algae cells as each individual lanthanide element at the same total concentration. This phenomenon is unique compared to the groups of other elements in the periodic table. Hence, we speculate that the monocellular organisms might not be able to sufficiently differentiate between the almost chemically identical lanthanide elements. Copyright (c) 2010 Elsevier Ltd. All rights reserved.

  9. Phospholipids of New Zealand Edible Brown Algae.

    Science.gov (United States)

    Vyssotski, Mikhail; Lagutin, Kirill; MacKenzie, Andrew; Mitchell, Kevin; Scott, Dawn

    2017-07-01

    Edible brown algae have attracted interest as a source of beneficial allenic carotenoid fucoxanthin, and glyco- and phospholipids enriched in polyunsaturated fatty acids. Unlike green algae, brown algae contain no or little phosphatidylserine, possessing an unusual aminophospholipid, phosphatidyl-O-[N-(2-hydroxyethyl) glycine], PHEG, instead. When our routinely used technique of 31 P-NMR analysis of phospholipids was applied to the samples of edible New Zealand brown algae, a number of signals corresponding to unidentified phosphorus-containing compounds were observed in total lipids. NI (negative ion) ESI QToF MS spectra confirmed the presence of more familiar phospholipids, and also suggested the presence of PHEG or its isomers. The structure of PHEG was confirmed by comparison with a synthetic standard. An unusual MS fragmentation pattern that was also observed prompted us to synthesise a number of possible candidates, and was found to follow that of phosphatidylhydroxyethyl methylcarbamate, likely an extraction artefact. An unexpected outcome was the finding of ceramidephosphoinositol that has not been reported previously as occurring in brown algae. An uncommon arsenic-containing phospholipid has also been observed and quantified, and its TLC behaviour studied, along with that of the newly synthesised lipids.

  10. Effect of ferrate on green algae removal.

    Science.gov (United States)

    Kubiňáková, Emília; Híveš, Ján; Gál, Miroslav; Fašková, Andrea

    2017-09-01

    Green algae Cladophora aegagropila, present in cooling water of thermal power plants, causes many problems and complications, especially during summer. However, algae and its metabolites are rarely eliminated by common removal methods. In this work, the elimination efficiency of electrochemically prepared potassium ferrate(VI) on algae from cooling water was investigated. The influence of experimental parameters, such as Fe(VI) dosage, application time, pH of the system, temperature and hydrodynamics of the solution on removal efficiency, was optimized. This study demonstrates that algae C. aegagropila can be effectively removed from cooling water by ferrate. Application of ferrate(VI) at the optimized dosage and under the suitable conditions (temperature, pH) leads to 100% removal of green algae Cladophora from the system. Environmentally friendly reduction products (Fe(III)) and coagulation properties favour the application of ferrate for the treatment of water contaminated with studied microorganisms compared to other methods such as chlorination and use of permanganate, where harmful products are produced.

  11. Radiation effects on algae and its application

    International Nuclear Information System (INIS)

    Dwivedi, Rakesh Kumar

    2013-01-01

    The effects of radiation on algae have been summarized in this article. Today, algae are being considered to have the great potential to fulfill the demand of food, fodder, fuel and various pharmaceutical products. Red algae are particularly rich in the content of polysaccharides present in their cell wall. For isolation of these polysaccharides, separation of cells cemented together by middle lamella is essential. The gamma rays are known to bring about biochemical changes in the cell wall and cause the breakdown of the middle lamella. These rays ate also known to speed up the starch sugar inter-conversion in the cells which is very useful for the tapping the potential of algae to be used as biofuel as well as in pharmaceutical industries. Cyanobacteria, among algae and other plants are more resistant to the radiation. In some cyanobacteria the radiation treatment is known to enhance the resistance against the antibiotics. Radiation treatment is also known to enhance the diameter of cell and size of the nitrogen fixing heterocyst. (author)

  12. Controlled regular locomotion of algae cell microrobots.

    Science.gov (United States)

    Xie, Shuangxi; Jiao, Niandong; Tung, Steve; Liu, Lianqing

    2016-06-01

    Algae cells can be considered as microrobots from the perspective of engineering. These organisms not only have a strong reproductive ability but can also sense the environment, harvest energy from the surroundings, and swim very efficiently, accommodating all these functions in a body of size on the order of dozens of micrometers. An interesting topic with respect to random swimming motions of algae cells in a liquid is how to precisely control them as microrobots such that they swim according to manually set routes. This study developed an ingenious method to steer swimming cells based on the phototaxis. The method used a varying light signal to direct the motion of the cells. The swimming trajectory, speed, and force of algae cells were analyzed in detail. Then the algae cell could be controlled to swim back and forth, and traverse a crossroad as a microrobot obeying specific traffic rules. Furthermore, their motions along arbitrarily set trajectories such as zigzag, and triangle were realized successfully under optical control. Robotize algae cells can be used to precisely transport and deliver cargo such as drug particles in microfluidic chip for biomedical treatment and pharmacodynamic analysis. The study findings are expected to bring significant breakthrough in biological drives and new biomedical applications.

  13. Freshwater algae of the Nevada Test Site

    International Nuclear Information System (INIS)

    Taylor, W.D.; Giles, K.R.

    1979-06-01

    Fifty-two species of freshwater algae were identified in samples collected from the eight known natural springs of the Nevada Test Site. Although several species were widespread, 29 species were site specific. Diatoms provided the greatest variety of species at each spring. Three-fifths of all algal species encountered were diatoms. Well-developed mats of filamentous green algae (Chlorophyta) were common in many of the water tanks associated with the springs and accounted for most of the algal biomass. Major nutrients were adequate, if not abundant, in most spring waters - growth being limited primarily by light and physical habitat. There was some evidence of cesium-137 bioconcentration by algae at several of the springs

  14. Freshwater algae of the Nevada Test Site

    Energy Technology Data Exchange (ETDEWEB)

    Taylor, W.D.; Giles, K.R.

    1979-06-01

    Fifty-two species of freshwater algae were identified in samples collected from the eight known natural springs of the Nevada Test Site. Although several species were widespread, 29 species were site specific. Diatoms provided the greatest variety of species at each spring. Three-fifths of all algal species encountered were diatoms. Well-developed mats of filamentous green algae (Chlorophyta) were common in many of the water tanks associated with the springs and accounted for most of the algal biomass. Major nutrients were adequate, if not abundant, in most spring waters - growth being limited primarily by light and physical habitat. There was some evidence of cesium-137 bioconcentration by algae at several of the springs.

  15. Behaviour of technetium in marine algae

    International Nuclear Information System (INIS)

    Bonotto, S.; Kirchmann, R.; Van Baelen, J.; Hurtger, C.; Cogneau, M.; Van der Ben, D.; Verthe, C.; Bouquegneau, J.M.

    1985-01-01

    Uptake and distribution of technetium were studied in several green (Acetabularia acetabulum, Boergesenia forbesii, Ulva lactuca) and brown (Ascophyllum nodosum, Fucus serratus, Fucus spiralis and Fucus vesiculosus) marine algae. Technetium was supplied to the algae as Tc-95m-pertechnetate. Under laboratory conditions, the algae were capable of accumulating technetium, with the exception, however, of Boergesenia, which showed concentration factors (C.F.) comprised between 0.28 and 0.71. The concentration of technetium-99 in Fucus spiralis, collected along the Belgian coast, was measured by a radiochemical procedure. The intracellular distribution of technetium was studied by differential centrifugation in Acetabularia and by the puncturing technique in Boergesenia. The chemical forms of technetium penetrated into the cells were investigated by selective chemical extractions, molecular sieving and thin layer chromatography

  16. Behaviour of technetium in marine algae

    International Nuclear Information System (INIS)

    Bonotto, S.; Kirchmann, R.; Baelen, J. van; Hurtgen, C.; Cogneau, M.; Ben, D. van der; Verthe, C.; Bouquegneau, J.M.

    1986-01-01

    Uptake and distribution of technetium were studied in several green (Acetabularia acetabulum, Boergesenia forbesii, Ulva lactuca) and brown (Ascophyllum nodosum, Fucus serratus, Fucus spiralis and Fucus vesiculosus) marine algae. Technetium was supplied to the algae as Tc-95-pertechnetate. Under laboratory conditions, the algae were capable of accumulating technetium, with the exception, however, of Boergesenia, which showed concentration factors (C.F.) comprised between 0.28 and 0.71. The concentration of technetium-99 in Fucus spiralis, collected along the Belgian coast, was measured by a radiochemical procedure. The intracellular distribution of technetium was studied by differential centrifugation in Acetabularia and by the puncturing technique in Boergesenia. The chemical forms of technetium penetrated into the cells were investigated by selective chemical extractions, molecular sieving and thin layer chromatography. (author)

  17. Study of metal bioaccumulation by nuclear microprobe analysis of algae fossils and living algae cells

    International Nuclear Information System (INIS)

    Guo, P.; Wang, J.; Li, X.; Zhu, J.; Reinert, T.; Heitmann, J.; Spemann, D.; Vogt, J.; Flagmeyer, R.-H.; Butz, T.

    2000-01-01

    Microscopic ion-beam analysis of palaeo-algae fossils and living green algae cells have been performed to study the metal bioaccumulation processes. The algae fossils, both single cellular and multicellular, are from the late Neoproterozonic (570 million years ago) ocean and perfectly preserved within a phosphorite formation. The biosorption of the rare earth element ions Nd 3+ by the green algae species euglena gracilis was investigated with a comparison between the normal cells and immobilized ones. The new Leipzig Nanoprobe, LIPSION, was used to produce a proton beam with 2 μm size and 0.5 nA beam current for this study. PIXE and RBS techniques were used for analysis and imaging. The observation of small metal rich spores (<10 μm) surrounding both of the fossils and the living cells proved the existence of some specific receptor sites which bind metal carrier ligands at the microbic surface. The bioaccumulation efficiency of neodymium by the algae cells was 10 times higher for immobilized algae cells. It confirms the fact that the algae immobilization is an useful technique to improve its metal bioaccumulation

  18. Modeling and optimization of algae growth

    OpenAIRE

    Thornton, Anthony Richard; Weinhart, Thomas; Bokhove, Onno; Zhang, Bowen; van der Sar, Dick M.; Kumar, Kundan; Pisarenco, Maxim; Rudnaya, Maria; Savceno, Valeriu; Rademacher, Jens; Zijlstra, Julia; Szabelska, Alicja; Zyprych, Joanna; van der Schans, Martin; Timperio, Vincent

    2010-01-01

    The wastewater from greenhouses has a high amount of mineral contamination and an environmentally-friendly method of removal is to use algae to clean this runo water. The algae consume the minerals as part of their growth process. In addition to cleaning the water, the created algal bio-mass has a variety of applications including production of bio-diesel, animal feed, products for pharmaceutical and cosmetic purposes, or it can even be used as a source of heating or electricity. The aim of t...

  19. Modeling and optimization of algae growth

    OpenAIRE

    Thornton, A; Weinhart, T; Bokhove, O; Zhang, B; Sar, van der, DM; Kumar, K Kundan; Pisarenco, M Maxim; Rudnaya, M Maria; Savcenco, V Valeriu; Rademacher, JDM; Zijlstra, J; Szabelska, A; Zyprych, J; Schans, van der, M Martin; Timperio, V

    2010-01-01

    The wastewater from greenhouses has a high amount of mineral contamination and an environmentally-friendly method of removal is to use algae to clean this runoff water. The algae consume the minerals as part of their growth process. In addition to cleaning the water, the created algal bio-mass has a variety of applications including production of bio-diesel, animal feed, products for pharmaceutical and cosmetic purposes, or it can even be used as a source of heating or electricity . The aim o...

  20. Serpins in plants and green algae

    DEFF Research Database (Denmark)

    Roberts, Thomas Hugh; Hejgaard, Jørn

    2008-01-01

    . Serpins have been found in diverse species of the plant kingdom and represent a distinct clade among serpins in multicellular organisms. Serpins are also found in green algae, but the evolutionary relationship between these serpins and those of plants remains unknown. Plant serpins are potent inhibitors...... of mammalian serine proteinases of the chymotrypsin family in vitro but, intriguingly, plants and green algae lack endogenous members of this proteinase family, the most common targets for animal serpins. An Arabidopsis serpin with a conserved reactive centre is now known to be capable of inhibiting...

  1. [Comparative chemical composition of the Barents Sea brown algae].

    Science.gov (United States)

    Obluchinskaia, E D

    2008-01-01

    Comparative study of phytochemical compositions of the most widespread brown algae species (one laminarian and four fucoid algae) from Barents Sea has been performed. A modified technique for mannitol determination in brown algae is proposed. It was revealed that fucus algae (fam. Fucaceae) contain 3% (of total dry weight) less mannitol than laminaria (Laminaria saccharina). The contents of alginic acid and laminaran in the Barents Sea fucoids are more than 10% less compared to laminaria. The alga L. saccharina contains almost two times more iodine than the species of fam. Fucaceae. The amounts of fucoidan and sum lipids in the Barents Sea fucoid algae is higher than in Laminaria saccharina (4-7% and 1-3%, respectively). In terms of contents of main biologically active compounds, fucus and laminarian algae from Barents Sea are inferior to none of the Far-Eastern species. The Barents Sea algae may become an important source of biologically active compounds.

  2. Use of Brown Algae to Demonstrate Natural Products Techniques.

    Science.gov (United States)

    Porter, Lee A.

    1985-01-01

    Background information is provided on the natural products found in marine organisms in general and the brown algae in particular. Also provided are the procedures needed to isolate D-mannitol (a primary metabolite) and cholesterol from brown algae. (JN)

  3. WASP7 BENTHIC ALGAE - MODEL THEORY AND USER'S GUIDE

    Science.gov (United States)

    The standard WASP7 eutrophication module includes nitrogen and phosphorus cycling, dissolved oxygen-organic matter interactions, and phytoplankton kinetics. In many shallow streams and rivers, however, the attached algae (benthic algae, or periphyton, attached to submerged substr...

  4. Association of thraustochytrids and fungi with living marine algae

    Digital Repository Service at National Institute of Oceanography (India)

    Raghukumar, C.; Nagarkar, S.; Raghukumar, S.

    only in C. clavulatum, Sargassum cinereum and Padina tetrastromatica whilst mycelial fungi occurred in all. Growth experiments in the laboratory indicated that the growth of thraustochytrids was inhibited on live algae, whereas killed algae supported...

  5. An Overview of Algae Biofuel Production and Potential Environmental Impact

    Science.gov (United States)

    Algae are among the most potentially significant sources of sustainable biofuels in the future of renewable energy. A feedstock with virtually unlimited applicability, algae can metabolize various waste streams (e.g., municipal wastewater, carbon dioxide from industrial flue gas)...

  6. Harmful impact of filamentous algae (Spirogyra sp.) on juvenile crayfish

    OpenAIRE

    Ulikowski Dariusz; Chybowski Łucjan; Traczuk Piotr

    2015-01-01

    The aim of this study was to determine the impact of filamentous algae on the growth and survival of juvenile narrow-clawed crayfish, Astacus leptodactylus (Esch.), in rearing basins. Three stocking variants were used: A - basins with a layer of filamentous algae without imitation mineral substrate; B - basins with a layer of filamentous algae with imitation mineral substrate; C - basins without filamentous algae but with mineral substrate. The crayfish were reared from June 12 to October 10 ...

  7. Mecánica de suelos : problemas resueltos

    OpenAIRE

    Olivella Pastallé, Sebastià

    1997-01-01

    Esta publicación contiene una colección de problemas resueltos de mecánica de suelos que ha sido preparada para los estudios de ingeniería técnica de obras públicas que se imparten en la UPC. Se trata de una titulación de primer ciclo, por lo que el enfoque que se da a los problemas se centra en aspectos de concepto y no requiere la realización de desarrollos matemáticos. Incluye problemas relativos a propiedades básicas de los suelos, aspectos básicos de la mecánica de medios porosos indefor...

  8. Aprendizaje basado en problemas en ingeniería

    DEFF Research Database (Denmark)

    El aprendizaje basado en problemas y proyectos (PBL) ha ganado popularidad alrededor del mundo como una práctica educativa efectiva para desarrollar habilidades y competencias en los estudiantes. El PBL tiene modelos y prácticas diversas que se fundamentan en teorías de aprendizaje. En este libro...... problemas y proyectos Modelos de PBL Trabajo en grupos y facilitación Desarrollo de competencias y habilidades Formulación de problemas en PBL Gestión de proyectos Implementación de cambio PBL en para aprendizaje en línea y tecnologías de la información El diseño de un modelo de PBL utiliza teorías de...

  9. KAROTENOID PADA ALGAE: KAJIAN TENTANG BIOSINTESIS, DISTRIBUSI SERTA FUNGSI KAROTENOID

    OpenAIRE

    Merdekawati, Windu; Karwur, Ferry F.; Susanto, A. B.

    2017-01-01

    ABSTRAK   Karotenoid terdistribusi pada archaea, bakteri, jamur, tumbuhan, hewan serta algae. Karotenoid dihasilkan dari komponen isopentenyl pyrophosphate (IPP) yang mengalami proses secara bertahap untuk membentuk beragam jenis karotenoid. Terdapat dua kelompok karotenoid yaitu karoten dan xantofil dengan berbagai jenis turunannya. Struktur kimia pada karotenoid algae yaitu allene, acetylene serta acetylated carotenoids. Algae mempunyai karotenoid spesifik yang menarik untuk dipe...

  10. Relationships between algae taxa and physico-chemical ...

    African Journals Online (AJOL)

    A study of algae flora was performed on 16 samples collected in different aquatic environments in Bamenda (Cameroon) in order to evidence the relationships between algae assemblages and physico-chemical parameters of the milieu. A total of 22 algae species were identified, the most represented class being ...

  11. Composition of phytoplankton algae in Gubi Reservoir, Bauchi ...

    African Journals Online (AJOL)

    Studies on the distribution, abundance and taxonomic composition of phytoplankton algae in Gubi reservoir were carried out for 12 months (from January to December 1995). Of the 26 algal taxa identified, 14 taxa belonged to the diatoms, 8 taxa were green algae while 4 taxa belonged to the blue-green algae. Higher cell ...

  12. Can the primary algae production be measured precisely?

    International Nuclear Information System (INIS)

    Olesen, M.; Lundsgaard, C.

    1996-01-01

    Algae production in seawater is extremely important as a basic link in marine food chains. Evaluation of the algae quantity is based on 14CO 2 tracer techniques while natural circulation and light absorption in seawater is taken insufficiently into account. Algae production can vary by 500% in similar nourishment conditions, but varying water mixing conditions. (EG)

  13. Inventory of North-West European algae initiatives

    NARCIS (Netherlands)

    Spruijt, J.

    2015-01-01

    In 2012 an inventory of North-West European (NWE) algae initiatives was carried out to get an impression of the market and research activities on algae production and refinery, especially for bioenergy purposes. A questionnaire was developed that would provide the EnAlgae project with information on

  14. How to Identify and Control Water Weeds and Algae.

    Science.gov (United States)

    Applied Biochemists, Inc., Mequon, WI.

    Included in this guide to water management are general descriptions of algae, toxic algae, weed problems in lakes, ponds, and canals, and general discussions of mechanical, biological and chemical control methods. In addition, pictures, descriptions, and recommended control methods are given for algae, 6 types of floating weeds, 18 types of…

  15. New methodologies for integrating algae with CO2 capture

    NARCIS (Netherlands)

    Hernandez Mireles, I.; Stel, R.W. van der; Goetheer, E.L.V.

    2014-01-01

    It is generally recognized, that algae could be an interesting option for reducing CO2 emissions. Based on light and CO2, algae can be used for the production various economically interesting products. Current algae cultivation techniques, however, still present a number of limitations. Efficient

  16. Agricultural importance of algae | Abdel-Raouf | African Journal of ...

    African Journals Online (AJOL)

    Algae are a large and diverse group of microorganisms that can carry out photosynthesis since they capture energy from sunlight. Algae play an important role in agriculture where they are used as biofertilizer and soil stabilizers. Algae, particularly the seaweeds, are used as fertilizers, resulting in less nitrogen and ...

  17. The algae of Gaborone wastewater stabilization ponds: Implications ...

    African Journals Online (AJOL)

    The types of algae found in the wastewater stabilization ponds in Gaborone were studied. Being the base of the food chain in any aquatic habitat, algae contribute significantly to the functioning and value of the ponds. The (liversit)' and abundance of the algae in the two pond systems at Broadhurst and Phakalane were ...

  18. Research and development for algae-based technologies in Korea: a review of algae biofuel production.

    Science.gov (United States)

    Hong, Ji Won; Jo, Seung-Woo; Yoon, Ho-Sung

    2015-03-01

    This review covers recent research and development (R&D) activities in the field of algae-based biofuels in Korea. As South Korea's energy policy paradigm has focused on the development of green energies, the government has funded several algae biofuel R&D consortia and pilot projects. Three major programs have been launched since 2009, and significant efforts are now being made to ensure a sustainable supply of algae-based biofuels. If these R&D projects are executed as planned for the next 10 years, they will enable us to overcome many technical barriers in algae biofuel technologies and help Korea to become one of the leading countries in green energy by 2020.

  19. Problemas dos alunos : Uma abordagem exploratória

    OpenAIRE

    Serpa, Margarida Damião; Caldeira, Suzana Nunes; Gomes, Carlos

    2008-01-01

    Colóquio Escola e Resolução de Problemas: do Indivíduo à Organização. Ponta Delgada: Universidade dos Açores, 5 de Abril de 2008 (Comunicação). A classificação dos problemas dos alunos revela-se fundamental para compreender os seus interesses e preocupações ao longo dos anos lectivos. Os resultados demonstram elevadas preocupações com os resultados escolares, relacionamento interpessoal, ludicidade e aquisição de prendas. Já ao nível dos interesses salienta-se os relacionamentos interpesso...

  20. Cimentaciones y estructuras de contención : problemas resueltos

    OpenAIRE

    Olivella Pastallé, Sebastià; Josa Garcia-Tornel, Alejandro; Valencia, Francisco José

    1999-01-01

    Esta publicación contiene una colección de problemas resueltos de Cimentaciones y Estructuras de Contención preparada para los estudios de Ingeniería Técnica de Obras Públicas que se imparten en la UPC. Contiene problemas resueltos de cimentaciones superficiales (zapatas), cimentaciones profundas (pilotes) y estructuras de contención (muros). Principalmente se realizan cálculos para comprobaciones tanto desde el punto de vista resistente (hundimiento, estabilidad) como en servicio (asie...

  1. El problema del paisaje en los actuales desarrollos Suburbanos

    OpenAIRE

    Arias Sierra, Pablo

    2001-01-01

    Investigar sobre lo que hoy significa el Paisaje de lo periférico se constituye en el tema central de la Tesis. Problema íntimamente vinculado a las transformaciones de la ciudad actual, que está desbordando las formas y fórmulas metropolitanas convencionales y que e ... Investigación sobre Paisaje, que como ya hemos afirmado no puede olvidar que la Nueva Ciudad tiene entre sí problemas de Sostenibilidad y retos medioambientales que se acrecientan cada día, en función del desinterés y la desc...

  2. Boécio e o problema dos futuros contingentes

    Directory of Open Access Journals (Sweden)

    William de Siqueira Piauí

    2010-09-01

    Full Text Available Esse artigo representa nossa crença de que é possível introduzir o pensamento de Boécio a partir de um dos problemas mais recorrentes da filosofia, o problema dos futuros contingentes, explicitando, a partir daquela problemática é claro, quais as ligações mais fundamentais entre três de suas obras, seus dois comentários ao De Interpretatione de Aristóteles e sua Consolaçáo da Filosofia, e, de forma bastante resumida evidentemente, como o alcance do pensamento contido nessas obras chega até pelo menos a filosofia kantiana.

  3. EL PROBLEMA DEL CUMPLEAÑOS, UNA GENERALIZACIÓN

    OpenAIRE

    Aranda, Moisés; Departamento de Matemáticas, Pontificia Universidad Javeriana y Universidad Sergio Arboleda; Molina, Fabio; Departamento de Matemáticas, Pontificia Universidad Javeriana y Universidad Sergio Arboleda; Moreno, Vladimir; Departamento de Matemáticas, Facultad de Ciencias, Pontificia Universidad Javeriana Cra. 7 No 43-82. Bogotá,

    2008-01-01

    El problema del cumpleaños, en el contexto clásico, se resuelve asumiendo una distribución de probabilidades uniforme discreta de los nacimientos. El propósito de este artículo es resolver el mismo problema bajo una distribución de probabilidades discreta arbitraria, y demostrar que bajo la distribución uniforme discreta, la probabilidad de que dos o más personas cumplan años en el mismo día es subestimada. Palabras clave: combinatoria, probabilidad, distribuciones discretas, muestra aleator...

  4. Photoprotection strategies of the alga Nannochloropsis gaditana

    NARCIS (Netherlands)

    Chukhutsina, Volha U.; Fristedt, Rikard; Morosinotto, Tomas; Croce, Roberta

    2017-01-01

    Nannochloropsis spp. are algae with high potential for biotechnological applications due to their capacity to accumulate lipids. However, little is known about their photosynthetic apparatus and acclimation/photoprotective strategies. In this work, we studied the mechanisms of non-photochemical

  5. Selenium accumulation and metabolism in algae.

    Science.gov (United States)

    Schiavon, Michela; Ertani, Andrea; Parrasia, Sofia; Vecchia, Francesca Dalla

    2017-08-01

    Selenium (Se) is an intriguing element because it is metabolically required by a variety of organisms, but it may induce toxicity at high doses. Algae primarily absorb selenium in the form of selenate or selenite using mechanisms similar to those reported in plants. However, while Se is needed by several species of microalgae, the essentiality of this element for plants has not been established yet. The study of Se uptake and accumulation strategies in micro- and macro-algae is of pivotal importance, as they represent potential vectors for Se movement in aquatic environments and Se at high levels may affect their growth causing a reduction in primary production. Some microalgae exhibit the capacity of efficiently converting Se to less harmful volatile compounds as a strategy to cope with Se toxicity. Therefore, they play a crucial role in Se-cycling through the ecosystem. On the other side, micro- or macro-algae enriched in Se may be used in Se biofortification programs aimed to improve Se content in human diet via supplementation of valuable food. Indeed, some organic forms of selenium (selenomethionine and methylselenocysteine) are known to act as anticarcinogenic compounds and exert a broad spectrum of beneficial effects in humans and other mammals. Here, we want to give an overview of the developments in the current understanding of Se uptake, accumulation and metabolism in algae, discussing potential ecotoxicological implications and nutritional aspects. Copyright © 2017 Elsevier B.V. All rights reserved.

  6. Isolation of glycoproteins from brown algae.

    OpenAIRE

    Surendraraj, Alagarsamy; Farvin Koduvayur Habeebullah , Sabeena; Jacobsen, Charlotte

    2015-01-01

    The present invention relates to a novel process for the isolation of unique anti-oxidative glycoproteins from the pH precipitated fractions of enzymatic extracts of brown algae. Two brown seaweeds viz, Fucus serratus and Fucus vesiculosus were hydrolysed by using 3 enzymes viz, Alcalase, Viscozyme and Termamyl and the glycoproteins were isolated from these enzyme extracts.

  7. Fucoidans — sulfated polysaccharides of brown algae

    Science.gov (United States)

    Usov, Anatolii I.; Bilan, M. I.

    2009-08-01

    The methods of isolation of fucoidans and determination of their chemical structures are reviewed. The fucoidans represent sulfated polysaccharides of brown algae, the composition of which varies from simple fucan sulfates to complex heteropolysaccharides. The currently known structures of such biopolymers are presented. A variety of the biological activities of fucoidans is briefly summarised.

  8. The ice nucleation activity of extremophilic algae

    Czech Academy of Sciences Publication Activity Database

    Kvíderová, Jana; Hájek, J.; Worland, M. R.

    2013-01-01

    Roč. 34, č. 2 (2013), s. 137-148 ISSN 0143-2044 R&D Projects: GA AV ČR KJB601630808; GA AV ČR KJB600050708 Institutional support: RVO:67985939 Keywords : Ice nucleation * snow algae * lichen photobionts Subject RIV: EF - Botanics Impact factor: 0.640, year: 2013

  9. Washington State University Algae Biofuels Research

    Energy Technology Data Exchange (ETDEWEB)

    chen, Shulin [Washington State Univ., Pullman, WA (United States). Dept. of Biological Systems Engineering; McCormick, Margaret [Targeted Growth, Inc., Seattle, WA (United States); Sutterlin, Rusty [Inventure Renewables, Inc., Gig Harbor, WA (United States)

    2012-12-29

    The goal of this project was to advance algal technologies for the production of biofuels and biochemicals by establishing the Washington State Algae Alliance, a collaboration partnership among two private companies (Targeted Growth, Inc. (TGI), Inventure Chemicals (Inventure) Inc (now Inventure Renewables Inc) and Washington State University (WSU). This project included three major components. The first one was strain development at TGI by genetically engineering cyanobacteria to yield high levels of lipid and other specialty chemicals. The second component was developing an algal culture system at WSU to produce algal biomass as biofuel feedstock year-round in the northern states of the United States. This system included two cultivation modes, the first one was a phototrophic process and the second a heterotrophic process. The phototrophic process would be used for algae production in open ponds during warm seasons; the heterotrophic process would be used in cold seasons so that year-round production of algal lipid would be possible. In warm seasons the heterotrophic process would also produce algal seeds to be used in the phototrophic culture process. Selected strains of green algae and cyanobacteria developed by TGI were tested in the system. The third component was downstream algal biomass processing by Inventure that included efficiently harvesting the usable fuel fractions from the algae mass and effectively isolating and separating the usable components into specific fractions, and converting isolated fractions into green chemicals.

  10. Isolation of glycoproteins from brown algae

    DEFF Research Database (Denmark)

    2015-01-01

    The present invention relates to a novel process for the isolation of unique anti-oxidative glycoproteins from the pH precipitated fractions of enzymatic extracts of brown algae. Two brown seaweeds viz, Fucus serratus and Fucus vesiculosus were hydrolysed by using 3 enzymes viz, Alcalase, Viscozyme...

  11. Bromophenols in Marine Algae and Their Bioactivities

    DEFF Research Database (Denmark)

    Ming, Liu; Hansen, Poul Erik; Lin, Xiukun

    2011-01-01

    Marine algae contain various bromophenols that have been shown to possess a variety of biological activities, including antioxidant, antimicrobial, anticancer, anti-diabetic, and anti-thrombotic effects. Here, we briefly review the recent progress of these marine algal biomaterials, with respect...

  12. Taxonomic Challenges and Distribution of Gracilarioid Algae ...

    African Journals Online (AJOL)

    This paper reviews the taxonomical literature of the gracilarioid algae from Tanzania, and provides information about their ecology and distribution based on an intensive regime of local collection. Its aim was to provide names, even if on a preliminary basis, for local gracilarioid taxa. Our revision shows that species ...

  13. Research for Developing Renewable Biofuels from Algae

    Energy Technology Data Exchange (ETDEWEB)

    Black, Paul N. [Univ. of Nebraska, Lincoln, NE (United States)

    2012-12-15

    Task A. Expansion of knowledge related to lipid production and secretion in algae A.1 Lipid biosynthesis in target algal species; Systems biology approaches are being used in combination with recent advances in Chlorella and Chlamydomonas genomics to address lipid accumulation in response to defined nutrient regimes. The UNL Algal Group continues screening additional species of Chlorella and other naturally occurring algae for those with optimal triglyceride production; Of the strains examined by the DOE's Aquatic Species Program, green algae, several species of Chlorella represent the largest group from which oleaginous candidates have been identified; A.1.1. Lipid profiling; Neutral lipid accumulation is routinely monitored by Nile red and BODIPY staining using high throughput strategies to screen for naturally occurring algae that accumulate triglyceride. These strategies complement those using spectrofluorometry to quantify lipid accumulation; Neutral lipid accumulation is routinely monitored by high performance thin-layer chromatography (HPTLC) and high performance liquid chromatography (HPLC) of lipid extracts in conjunction with; Carbon portioning experiments have been completed and the data currently are being analyzed and prepared for publication; Methods in the Black lab were developed to identify and quantify triacylglycerol (TAG), major membrane lipids [diacylglycerol trimethylhomoserine, phosphatidylethanolamine and chloroplast glycolipids], biosynthetic intermediates such as diacylglycerol, phosphatidic acid and lysophospholipids and different species of acyl-coenzyme A (acyl CoA).

  14. Usos industriales de las algas diatomeas.

    OpenAIRE

    Illana Esteban, Carlos

    2007-01-01

    Las diatomeas son algas microscópicas que habitan tanto en aguas dulces como marinas. Aparte de su destacado papel en la cadena trófica de los ecosistemas acuáticos, con el tiempo forman depósitos a los que el hombre ha encontrado abundantes aplicaciones prácticas.

  15. The Biology of blue-green algae

    National Research Council Canada - National Science Library

    Carr, Nicholas G; Whitton, B. A

    1973-01-01

    .... This book, extensively illustrated and thoroughly referenced, will provide the source material for students, and experienced as well as new research workers should find it of great value. A series of short appendices summarize details of culture collections, media and some specialized aspects of growing blue-green algae.

  16. Spirulina: The Alga That Can End Malnutrition.

    Science.gov (United States)

    Fox, Ripley D.

    1985-01-01

    One approach to eliminating malnutrition worldwide is to grow spirulina in recycled village wastes. Spirulina is a blue-green alga and a natural concentrated food. Spirulina can give poor villages a nutritional food supplement they can grow themselves and can reduce infectious disease at the same time. (Author/RM)

  17. Sterol chemotaxonomy of marine pelagophyte algae.

    Science.gov (United States)

    Giner, José-Luis; Zhao, Hui; Boyer, Gregory L; Satchwell, Michael F; Andersen, Robert A

    2009-07-01

    Several marine algae of the class Pelagophyceae produce the unusual marine sterol 24-propylidenecholesterol, mainly as the (24E)-isomer. The (24Z)-isomer had previously been considered as a specific biomarker for Aureococcus anophagefferens, the 'brown tide' alga of the Northeast coast of the USA. To test this hypothesis and to generate chemotaxonomic information, the sterol compositions of 42 strains of pelagophyte algae including 17 strains of Aureococcus anophagefferens were determined by GC analysis. A more comprehensive sterol analysis by HPLC and (1)H-NMR was obtained for 17 selected pelagophyte strains. All strains analyzed contained 24-propylidenecholesterol. In all strains belonging to the order Sarcinochrysidales, this sterol was found only as the (E)-isomer, while all strains in the order Pelagomonadales contained the (Z)-isomer, either alone or together with the (E)-isomer. The occurrence of Delta(22) and 24alpha-sterols was limited to the Sarcinochrysidales. The first occurrence of Delta(22)-24-propylcholesterol in an alga, CCMP 1410, was reported. Traces of the rare sterol 26,26-dimethyl-24-methylenecholesterol were detected in Aureococcus anophagefferens, and the (25R)-configuration was proposed, based on biosynthetic considerations. Traces of a novel sterol, 24-propylidenecholesta-5,25-dien-3beta-ol, were detected in several species.

  18. CONVERGÊNCIA E TRANSMÍDIA: GALÁXIAS SEMÂNTICAS E NARRATIVAS EMERGENTES EM JORNALISMO

    Directory of Open Access Journals (Sweden)

    Geane Alzamora

    2012-06-01

    Full Text Available Este artigo procura discutir as possibilidades de aplicação no Jornalismo do conceito de narrativa transmidiática, proposto por Henry Jenkins (2003 no âmbito das narrativas ficcionais. Aborda inicialmente as definições de Transmedia Storytelling, investiga as diferenças conceituais entre convergência e transmídia e propõe uma abordagem própria do conceito de transmídia no universo jornalístico, fundada na perspectiva do conhecimento produzido em dimensão transmidiática e nas especificidades informacionais dos formatos. Conclui com uma exploração inicial de exemplos de narrativas emergentes no contexto do jornalismo transmidiático, como o Jornalismo de Imersão e os newsgames, sugerindo que o experimentalismo seja um aspecto marcante da narrativa transmídia.

  19. Efectos sobre la salud de la contaminación de agua y alimentos por virus emergentes humanos

    Directory of Open Access Journals (Sweden)

    Sílvia Bofill-Mas

    2005-01-01

    Full Text Available El desarrollo de tecnologías moleculares aplicadas a estudios ambientales ha permitido constatar que incluso en países altamente industrializados existe una alta prevalencia de virus en el medio ambiente, lo que causa un importante impacto en la salud pública e importantes pérdidas económicas, principalmente a través de la transmisión de virus por agua y alimentos. Concentraciones significativas de virus son detectadas en las aguas vertidas al ambiente y en los biosólidos generados en plantas de tratamiento de agua residual. En este trabajo se describen las características generales de la contaminaci ón ambiental por virus, principalmente por virus emergentes, analizándose con mayor profundidad los virus de la hepatitis E (VHE y los poliomavirus humanos como los virus contaminantes ambientales de más reciente identificación en países industrializados. Se ha demostrado que existe una elevada prevalencia de los poliomavirus humanos, BK y JC, en agua residual en todos los paí- ses estudiados, lo que implica la potencial transmisión de los virus y de genes potencialmente cancerígenos por vía oral. Estudios recientes demuestran que el patrón epidemiológico de la infección por VHE en países industrializados es complejo y que una gran diversidad de cepas del VHE infecta simultáneamente a la población. El control de la contaminación viral del medio ambiente requiere la estandarización de técnicas moleculares y el desarrollo de un programa de vigilancia que permita valorar parámetros víricos y reducir la diseminación de las enfermedades establecidas y de las infecciones víricas emergentes.

  20. Programa de apoyo al trabajador-cuidador familiar: fenómeno social emergente

    Directory of Open Access Journals (Sweden)

    Luz María Herrera-López

    2014-01-01

    Full Text Available En el contexto demográfico actual de envejecimiento poblacional surge un nuevo rol: el funcionario-cuidador. La persona que trabaja y, además, cuida a un familiar con discapacidad, presenta problemas personales, laborales y menor compromiso con su autocuidado. Entre las intervenciones eficaces se encuentra el mejorar la percepción del apoyo social. Se presenta un programa interdisciplinario, iniciado en el año 2009, de apoyo a trabajadores-cuidadores familiares. Su propósito es promover la salud y prevenir factores de riesgo de enferme- dad a través del fortalecimiento de sus habilidades de autocuidado y el desarrollo de políticas institucionales que faciliten el cumplimiento de ambos roles en forma eficiente y saludable. Como estrategias de promoción en salud se han utilizado: la educación para el autocuidado, el fortalecimiento de redes de apoyo familiar y social, la asesoría profesional y la comunidad de pares. En las últimas tres cohortes anua- les han participado sesenta funcionarios, de los cuales el 83,4 % son mujeres, con un promedio de edad de cincuenta años. El programa ha cumplido con éxito los objetivos propuestos, aumentando la percepción de apoyo social manifestado por los propios participantes.

  1. VIOLENCIA HACIA LA MUJER: UN PROBLEMA DE TODOS

    OpenAIRE

    Aliaga P.,Patricia; Ahumada G.,Sandra; Marfull J.,Marisol

    2003-01-01

    Se analizan conceptos, definiciones y prevalencia de la Violencia hacia la Mujer, así como, consecuencias en la salud física, psicológica y sexual de las mujeres, haciendo referencia a los costos sociales y económicos y llamando a la comunidad médica a la visibilización de este problema

  2. Sulfated polysaccharides as bioactive agents from marine algae.

    Science.gov (United States)

    Ngo, Dai-Hung; Kim, Se-Kwon

    2013-11-01

    Recently, much attention has been paid by consumers toward natural bioactive compounds as functional ingredients in nutraceuticals. Marine algae are considered as valuable sources of structurally diverse bioactive compounds. Marine algae are rich in sulfated polysaccharides (SPs) such as carrageenans in red algae, fucoidans in brown algae and ulvans in green algae. These SPs exhibit many health beneficial nutraceutical effects such as antioxidant, anti-allergic, anti-human immunodeficiency virus, anticancer and anticoagulant activities. Therefore, marine algae derived SPs have great potential to be further developed as medicinal food products or nutraceuticals in the food industry. This contribution presents an overview of nutraceutical effects and potential health benefits of SPs derived from marine algae. Copyright © 2013 Elsevier B.V. All rights reserved.

  3. Biofuels from algae for sustainable development

    International Nuclear Information System (INIS)

    Demirbas, M. Fatih

    2011-01-01

    Microalgae are photosynthetic microorganisms that can produce lipids, proteins and carbohydrates in large amounts over short periods of time. These products can be processed into both biofuels and useful chemicals. Two algae samples (Cladophora fracta and Chlorella protothecoid) were studied for biofuel production. Microalgae appear to be the only source of renewable biodiesel that is capable of meeting the global demand for transport fuels. Microalgae can be converted to biodiesel, bioethanol, bio-oil, biohydrogen and biomethane via thermochemical and biochemical methods. Industrial reactors for algal culture are open ponds, photobioreactors and closed systems. Algae can be grown almost anywhere, even on sewage or salt water, and does not require fertile land or food crops, and processing requires less energy than the algae provides. Microalgae have much faster growth-rates than terrestrial crops. the per unit area yield of oil from algae is estimated to be from 20,000 to 80,000 liters per acre, per year; this is 7-31 times greater than the next best crop, palm oil. Algal oil can be used to make biodiesel for cars, trucks, and airplanes. The lipid and fatty acid contents of microalgae vary in accordance with culture conditions. The effect of temperature on the yield of hydrogen from two algae (C. fracta and C. protothecoid) by pyrolysis and steam gasification were investigated in this study. In each run, the main components of the gas phase were CO 2 , CO, H 2 , and CH 4 .The yields of hydrogen by pyrolysis and steam gasification processes of the samples increased with temperature. The yields of gaseous products from the samples of C. fracta and C. protothecoides increased from 8.2% to 39.2% and 9.5% to 40.6% by volume, respectively, while the final pyrolysis temperature was increased from 575 to 925 K. The percent of hydrogen in gaseous products from the samples of C. fracta and C. protothecoides increased from 25.8% to 44.4% and 27.6% to 48.7% by volume

  4. Bioconcentration of tetrachlorobenzene in marine algae

    Science.gov (United States)

    Wang, Xiu-Lin; Ma, Yan-Jun; Cheng, Gang; Yu, Wei-Jun; Zhang, Li-Jun

    1997-09-01

    Bioconcentration of tetrachlorobenzene (TeCB) in Chlorella marine, Nannochloropsis oculata, Pyramidomonas sp., Platymonas subcordiformis, and Phaeodactylum tricornutum; and toxicity of TeCB to the marine algae were tested. Values of bioconcentration potential parameters, including uptake rate constant k 1, elimination rate constant k 2 and bioconcentration factor BCF, were obtained not only from the time course of TeCB uptake by the marine algae by using a bioconcentration model, but also from the acute toxicity test data for percent inhibition PI(%)˜exposure concentration of TeCB-time by using a combined bioconcentration and probability model. The results showed good relationship between k 1(TOXIC) and k 1(UPTAKE) and k 2(TOXIC), k 2(UPTAKE), and BCF D(IOXIC) and BCF D(UPTAKE). Especially, the values of BCF D(TOXIC) were well consistent with those of BCF D(UPTAKE).

  5. [Chemical constituents from red alga Corallina pilulifera].

    Science.gov (United States)

    Yuan, Zhao-Hui; Han, Li-Jun; Fan, Xiao; Li, Shuai; Shi, Da-Yong; Sun, Jie; Ma, Ming; Yang, Yong-Chun; Shi, Jian-Gong

    2006-11-01

    To investigate the chemical constituents of red alga Corallina pilulifera. Compounds were isolated by normal phase silica gel and Sephadex LH - 20 gel column chromatography, reverse phase HPLC and recrystallization. Their structures were elucidated by spectroscopic methods including MS, 1H-NMR, 13C-NMR, HSQC, HMBC. Cytotoxicity of the compounds was screened by using standard MTT method. Seven compounds were isolated from red alga C. pilulifera, their structures were identified as (E) -phytol epoxide (1), phytenal (2), phytol (3), dehydrovomifoliol (4), loliolide (5), 3beta-hydroxy-5alpha, 6alpha-epoxy-7-megastigmene-9-one (6), 4-hydroxybenzaldehyde (7). All of the compounds were obtained from this species for the first time. These compounds were inactive (IC50 > 10 microg x mL(-1)) in the MTT assay.

  6. Radiokinetic study in betony marine algae

    International Nuclear Information System (INIS)

    Azevedo Gouvea, V. de.

    1981-01-01

    The influx and outflux kinetics of some radionuclides in algae of the Rio de Janeiro coastline, were studied in order to select bioindicators for radioactive contamination in aquatic media, due to the presence of Nuclear Power Stations. Bioassays of the concentration and loss of radionuclides such as 137 Cs, 51 Cr, 60 Co and 131 I were performed in 1000cm 3 aquarium under controlled laboratory conditions, using a single channel gamma counting system, to study the species of algae most frequently found in the region. The concentration and loss parameters for all the species and radionuclides studied were obtained from the normalized results. The loss parameters were computerwise adjusted using Powell's multiparametric method. (author)

  7. Hyperaccumulation of radioactive isotopes by marine algae

    International Nuclear Information System (INIS)

    Ishii, Toshiaki; Hirano, Shigeki; Watabe, Teruhisa

    2003-01-01

    Hyperaccumlators are effective indicator organisms for monitoring marine pollution by heavy metals and artificial radionuclides. We found a green algae, Bryopsis maxima that hyperaccumulate a stable and radioactive isotopes such as Sr-90, Tc-99, Ba-138, Re-187, and Ra-226. B. maxima showed high concentration factors for heavy alkali earth metals like Ba and Ra, compared with other marine algae in Japan. Furthermore, this species had the highest concentrations for Tc-99 and Re-187. The accumulation and excretion patterns of Sr-85 and Tc-95m were examined by tracer experiments. The chemical states of Sr and Re in living B. maxima were analyzed by HPLC-ICP/MS, LC/MS, and X-ray absorption fine structure analysis using synchrotron radiation. (author)

  8. Multiplicity of viral infection in brown algae

    OpenAIRE

    Stevens, Kim

    2014-01-01

    Brown algae are important primary producers and habitat formers in coastal environments and are believed to have evolved multicellularity independently of the other eukaryotes. The phaeoviruses that infect them form a stable lysogenic relationship with their host via genome integration, but have only been extensively studied in two genera: Ectocarpus and Feldmannia. In this study I aim to improve our understanding of the genetic diversity, host range and distribution of phaeoviruses. Seq...

  9. Algae-Derived Dietary Ingredients Nourish Animals

    Science.gov (United States)

    2015-01-01

    In the 1980s, Columbia, Maryland-based Martek Biosciences Corporation worked with Ames Research Center to pioneer the use of microalgae as a source of essential omega-3 fatty acids, work that led the company to develop its highly successful Formulaid product. Now the Nutritional Products Division of Royal DSM, the company also manufactures DHAgold, a nutritional supplement for pets, livestock and farm-raised fish that uses algae to deliver docosahexaenoic acid (DHA).

  10. Electro-coagulation-flotation process for algae removal

    International Nuclear Information System (INIS)

    Gao Shanshan; Yang Jixian; Tian Jiayu; Ma Fang; Tu Gang; Du Maoan

    2010-01-01

    Algae in surface water have been a long-term issue all over the world, due to their adverse influence on drinking water treatment process as well as drinking water quality. The algae removal by electro-coagulation-flotation (ECF) technology was investigated in this paper. The results indicated that aluminum was an excellent electrode material for algae removal as compared with iron. The optimal parameters determined were: current density = 1 mA/cm 2 , pH = 4-7, water temperature = 18-36 deg. C, algae density = 0.55 x 10 9 -1.55 x 10 9 cells/L. Under the optimal conditions, 100% of algae removal was achieved with the energy consumption as low as 0.4 kWh/m 3 . The ECF performed well in acid and neutral conditions. At low initial pH of 4-7, the cell density of algae was effectively removed in the ECF, mainly through the charge neutralization mechanism; while the algae removal worsened when the pH increased (7-10), and the main mechanism shifted to sweeping flocculation and enmeshment. The mechanisms for algae removal at different pH were also confirmed by atomic force microscopy (AFM) analysis. Furthermore, initial cell density and water temperature could also influence the algae removal. Overall, the results indicated that the ECF technology was effective for algae removal, from both the technical and economical points of view.

  11. Regulating cellular trace metal economy in algae.

    Science.gov (United States)

    Blaby-Haas, Crysten E; Merchant, Sabeeha S

    2017-10-01

    As indispensable protein cofactors, Fe, Mn, Cu and Zn are at the center of multifaceted acclimation mechanisms that have evolved to ensure extracellular supply meets intracellular demand. Starting with selective transport at the plasma membrane and ending in protein metalation, metal homeostasis in algae involves regulated trafficking of metal ions across membranes, intracellular compartmentalization by proteins and organelles, and metal-sparing/recycling mechanisms to optimize metal-use efficiency. Overlaid on these processes are additional circuits that respond to the metabolic state as well as to the prior metal status of the cell. In this review, we focus on recent progress made toward understanding the pathways by which the single-celled, green alga Chlamydomonas reinhardtii controls its cellular trace metal economy. We also compare these mechanisms to characterized and putative processes in other algal lineages. Photosynthetic microbes continue to provide insight into cellular regulation and handling of Cu, Fe, Zn and Mn as a function of the nutritional supply and cellular demand for metal cofactors. New experimental tools such as RNA-Seq and subcellular metal imaging are bringing us closer to a molecular understanding of acclimation to supply dynamics in algae and beyond. Copyright © 2017 Elsevier Ltd. All rights reserved.

  12. New records of marine algae in Vietnam

    Science.gov (United States)

    Le Hau, Nhu; Ly, Bui Minh; Van Huynh, Tran; Trung, Vo Thanh

    2015-06-01

    In May, 2013, a scientific expedition was organized by the Vietnam Academy of Science and Technology (VAST) and the Far Eastern Branch of the Russian Academy of Sciences (FEBRAS) through the frame of the VAST-FEBRAS International Collaboration Program. The expedition went along the coast of Vietnam from Quang Ninh to Kien Giang. The objective was to collect natural resources to investigate the biological and biochemical diversity of the territorial waters of Vietnam. Among the collected algae, six taxa are new records for the Vietnam algal flora. They are the red algae Titanophora pikeana (Dickie) Feldmann from Cu Lao Xanh Island, Laurencia natalensis Kylin from Tho Chu Island, Coelothrix irregularis (Harvey) Børgesen from Con Dao Island, the green algae Caulerpa oligophylla Montagne, Caulerpa andamanensis (W.R. Taylor) Draisma, Prudhomme et Sauvage from Phu Quy Island, and Caulerpa falcifolia Harvey & Bailey from Ly Son Island. The seaweed flora of Vietnam now counts 833 marine algal taxa, including 415 Rhodophyta, 147 Phaeophyceae, 183 Chlorophyta, and 88 Cyanobacteria.

  13. Functional properties of carotenoids originating from algae.

    Science.gov (United States)

    Christaki, Efterpi; Bonos, Eleftherios; Giannenas, Ilias; Florou-Paneri, Panagiota

    2013-01-15

    Carotenoids are isoprenoid molecules which are synthesised de novo by photosynthetic plants, fungi and algae and are responsible for the orange, yellow and some red colours of various fruits and vegetables. Carotenoids are lipophilic compounds, some of which act as provitamins A. These compounds can be divided into xanthophylls and carotenes. Many macroalgae and microalgae are rich in carotenoids, where these compounds aid in the absorption of sunlight. Industrially, these carotenoids are used as food pigments (in dairy products, beverages, etc.), as feed additives, in cosmetics and in pharmaceuticals, especially nowadays when there is an increasing demand by consumers for natural products. Production of carotenoids from algae has many advantages compared to other sources; for example, their production is cheap, easy and environmentally friendly; their extraction is easier, with higher yields, and there is no lack of raw materials or limited seasonal variation. Recently, there has been considerable interest in dietary carotenoids with respect to their antioxidant properties and their ability to reduce the incidence of some chronic diseases where free radicals are involved. Possibly, carotenoids protect cells from oxidative stress by quenching singlet oxygen damage with various mechanisms. Therefore, carotenoids derived from algae could be a leading natural resource in the research for potential functional ingredients. Copyright © 2012 Society of Chemical Industry.

  14. Custo de capital próprio em mercados emergentes: uma abordagem empírica no Brasil com o downside risk

    Directory of Open Access Journals (Sweden)

    Graziela Xavier Fortunato

    2010-02-01

    Full Text Available Este artigo visa testar empiricamente a proposta de Estrada (2000 para as empresas que compoem o Ibovespa, avaliando se para mercados emergentes existem outras medidas de risco sistematico diferentes do beta do capital asset pricing model (CAPM. Dessa forma, testou-se o downside risk que capta a parte negativa do retorno. Alem de dados em cross section, utilizaram-se dados em painel, como uma contribuição adicional ao trabalho de Estrada (2000. Os resultados encontrados não confirmam que o downside risk seja uma medida apropriada ao mercado brasileiro. Outras medidas de risco apresentaram melhor correlacao com o retorno, permitindo o calculo do custo de capital com valor diferente daquele obtido pela aplicacao do beta. De acordo com Estrada (2000, os resultados sugerem que os mercados emergentes estao em posicao intermediaria entre os mercados integrados e segmentados, tal como confirmado para o mercado brasileiro.

  15. Amostragem do banco de semente e flora emergente de plantas daninhas Sampling of weed seedbank and emerged populations

    Directory of Open Access Journals (Sweden)

    Elemar Voll

    2003-02-01

    Full Text Available O objetivo desta pesquisa foi determinar o número de amostras necessárias para estimar com precisão aceitável a quantidade de sementes no solo e a flora de plantas daninhas emergentes, em áreas experimentais e de lavoura, para auxiliar na tomada de decisão das estratégias de manejo das plantas daninhas. A amostragem do solo para quantificação do banco de sementes foi feita com trado tubular de 5,0 cm de diâmetro, na profundidade de 0 a 10 cm. A flora emergente foi contada por meio de um gabarito de ferro nas dimensões de 0,5x0,5 m, de forma aleatória na área. O número de amostras necessário foi estimado em razão da média de sementes da amostra, para uma determinada precisão (CV = 20% ou 40%. Foi estimado que, nas áreas experimentais, para médias de 10 a 20 sementes/amostra de solo (500 a 1.000 sementes/m² e coeficiente de variação de 20%, são necessárias entre 40 e 90 amostras, respectivamente; com 40% (menor precisão, entre 10 e 20 amostras. Considerando o mesmo intervalo em áreas de lavoura, representativas de glebas homogêneas, o tamanho de amostragem necessária é cerca de três vezes maior. Levantamentos da flora daninha emergente apresentam menor associação dos dados (média e variância entre si, portanto, são menos apropriados para decisões de manejo.The objective of this research was to determine the number of soil samples needed to estimate with reasonable precision level the amount of seeds in the soil and the emerged weeds, in a seedbank of experimental and cropland areas, in order to help management decisions. Sampling the soil seedbank was carried out by using a tubular soil sampler core of 5 cm diameter, from 0 to 10 cm soil depth. Emerged weeds were scouted by placing iron quadrats (0.5x0.5 m, randomly. The number of samples required was estimated as a function of the average seeds per sample, given a required precision (CV = 20% or 40%. For the small plots, means between 10 and 20 seeds

  16. COMPLEJIDAD AMBIENTAL: PROPUESTAS ÉTICAS EMERGENTES DEL PENSAMIENTO AMBIENTAL LATINOAMERICANO

    Directory of Open Access Journals (Sweden)

    Noguera de Echeverri Ana Patricia

    2008-07-01

    Full Text Available En este artículo, se recogen las propuestas ético ambientales más importantes de la Escuela de Pensamiento Ambiental Latinoamericano, que ha ido construyéndose desde hace 30 años. Se destacan autores de primera línea en el campo de la construcción de Pensamiento Ambiental filosófico, como el Filósofo y Pensador Colombiano, de trascendencia latinoamericana, Augusto Ángel Maya, quien plantea la posibilidad de construir una Filosofía Ambiental Ético estética, dado que la Filosofía Moderna ha sido Metafísica, aún en sus corrientes empiristas, positivistas y neopositivistas. Se destaca la obra de Enrique Leff, mexicano, que propone los conceptos de Complejidad y Saber Ambiental, como puntos de partida de una ética en la educación, la ciencia y la tecnología, dentro de unas relaciones sistémicas y holísticas. Igualmente la propuesta ético estética compleja de Julio Carrizoza, colombiano, se hace presente en este ensayo, como una propuesta política fundamental ante problemas colombianos como son la violencia y la exclusión. Las propuestas de Filósofos colombianos de gran importancia en el campo de la Filosofía Política y Moral, que han desembocado en la propuesta de una Ética Ambiental, Pública y Comunicativa, como es el caso de Guillermo Hoyos Vásquez y de otros pensadores tanto de Colombia como de otros países latinoamericanos, se presentan en este espacio, con el fin de recoger de manera crítica nuestras ideas acerca de la posibilidad de una ética ambiental, es decir una ética descentrada, sin sujeto y sin objeto, una ética sistémica, donde los valores se construyen en las relaciones y donde la intricada trama de la vida, que ha venido construyéndose desde hace más de 2.500 millones de años, y de la cual somos meros hilos, pasa de ser objeto a ser valor primero en su más genuino sentido.

  17. Adopción y problemas de conducta

    OpenAIRE

    Palacios González, Jesús; Sánchez Sandoval, Yolanda; León Manso, Esperanza

    2005-01-01

    Los problemas de conducta de niños y niñas adoptados se examinan en este trabajo más desde la perspectiva de su variabilidad intragrupo, que desde la de comparación adoptados-no adoptados. En una muestra de 181 niñas y niños procedentes de seis países y adoptados en España a una edad promedio de 38.5 meses, se analizaron los problemas de conducta y el contexto de las relaciones padres-hijos en los que se sitúan. Los datos resaltan la normalidad general de los adoptados, así ...

  18. Modelos matemáticos en un problema de epidemias

    Directory of Open Access Journals (Sweden)

    Anna Vidal

    2016-01-01

    Full Text Available La introducción de conceptos matemáticos a través del desarrollo y estudio de modelos ha sido tratado en numerosos trabajos. La introducción de los modelos suele hacerse básicamente desde el discurso del professor y el trabajo del alumno suele reducirse a la experimentación con el modelo dado. La aproximación a un problema mediante modelos IBM (Individual Based Model resulta más comprensible para el alumno, permite justificar y complementar otras aproximaciones a la solución (modelos diferenciales continuos y/o modelos discretos. En este trabajo se presenta una experiencia docente basada en afrontar un mismo problema mediante enfoques complementarios en base a modelos continuos, discretos e IBM. Finalmente se presenta una propuesta metodológica para ponerla en práctica utilizando el Aprendizaje Cooperativo y el Problem/Project Based Learning.

  19. Saúde mental e trabalho: os problemas que persistem

    Directory of Open Access Journals (Sweden)

    Leny Sato

    Full Text Available Este artigo toma por objeto a Saúde Mental e Trabalho como uma subárea do campo da Saúde do Trabalhador. Parte da constatação de que os problemas de saúde mental e trabalho, já identificados em meados da década de 1980, persistem. Após retomar a taxonomia de tais problemas, busca evidenciar algumas de suas expressões atuais a partir da assistência e da vigilância em saúde do trabalhador, bem como pela perspectiva de alguns sindicatos mais atentos à questão. Para tal, toma como ponto de partida o Centro de Referência em Saúde do Trabalhador (CRST de Campinas. Por fim, pontua algumas características do trabalho no contexto atual para compreender as motivações dessa persistência.

  20. Aprender con problemas: un enfoque contextualizado y socializado del conocimiento

    Directory of Open Access Journals (Sweden)

    Lola GARCÍA OLALLA

    2008-01-01

    Full Text Available El estudio que presentamos se centra en la utilización del ABP (Aprendizaje Basado en Problemas, que articula dos asignaturas cuatrimestrales: Desarrollo Socioafectivo y Desarrollo Psicomotor. Concluimos que la metodología ABP favorece el aprendizaje significativo, aprender a trabajar en grupo, resolver problemas de forma cooperativa, y la conexión entre la formación teórica y los contextos de actuación profesional. El aprendizaje cooperativo favorece la dinámica de trabajo en equipo, la responsabilidad personal y el desarrollo de estrategias de colaboración, y de competencias sociales como aprender a escuchar, respetar las opiniones de otros, organizar el trabajo, debatir y llegar a consensos, saber expresarse y exponer opiniones, o empatizar.

  1. Problema de equilíbrio em Redes de Transporte

    OpenAIRE

    Costodio, Junelene

    2003-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção. Neste trabalho é proposta uma análise entre o comportamento do algoritmo do Gradiente Projetado (GP), o qual é um algoritmo de enumeração de caminhos, e o algoritmo das Combinações Convexas (também conhecido como algoritmo de Frank-Wolfe), frente à resolução do Problema de Equilíbrio em Redes de Transporte. É também fornecida uma análise do Problema de E...

  2. Mapa Conceptual Para El Aprendizaje Basado En Problemas

    Directory of Open Access Journals (Sweden)

    Yuri Gorbaneff

    2009-01-01

    Full Text Available Se presentan los resultados del experimento sobre el uso de mapas conceptuales en el contexto del aprendizaje basado en problemas (ABP. El experimento fue realizado en la Universidad Javeriana (Bogotá, Colombia en el pregrado de administración. Se encontró que el mapa conceptual mejora el aprendizaje pero no afecta la percepción de los alumnos del método de ABP. Se recomienda incluir mapas conceptuales en los ejercicios de ABP.

  3. MAPA CONCEPTUAL PARA EL APRENDIZAJE BASADO EN PROBLEMAS

    Directory of Open Access Journals (Sweden)

    YURI GORBANEFF

    2009-01-01

    Full Text Available Se presentan los resultados del experimento sobre el uso de mapas conceptuales en el contexto del aprendizaje basado en problemas (ABP. El experimento fue realizado en la Universidad Javeriana (Bogotá, Colombia en el pregrado de administración. Se encontró que el mapa conceptual mejora el aprendizaje pero no afecta la percepción de los alumnos del método de ABP. Se recomienda incluir mapas conceptuales en los ejercicios de ABP.

  4. Interspecific variation in total phenolic content in temperate brown algae

    Directory of Open Access Journals (Sweden)

    Anna Maria Mannino

    2017-09-01

    Full Text Available Marine algae synthesize secondary metabolites such as polyphenols that function as defense and protection mechanisms. Among brown algae, Fucales and Dictyotales (Phaeophyceae contain the highest levels of phenolic compounds, mainly phlorotannins, that play multiple roles. Four temperate brown algae (Cystoseira amentacea, Cystoseira compressa, Dictyopteris polypodioides and Padina pavonica were studied for total phenolic contents. Total phenolic content was determined colorimetrically with the Folin-Ciocalteu reagent. Significant differences in total phenolic content were observed between leathery and sheetlike algae and also within each morphological group. Among the four species, the sheet-like alga D. polypodioides, living in the upper infralittoral zone, showed the highest concentration of phenolic compounds. These results are in agreement with the hypothesis that total phenolic content in temperate brown algae is influenced by a combination of several factors, such as growth form, depth, and exposition to solar radiation.

  5. Algae to Economically Viable Low-Carbon-Footprint Oil.

    Science.gov (United States)

    Bhujade, Ramesh; Chidambaram, Mandan; Kumar, Avnish; Sapre, Ajit

    2017-06-07

    Algal oil as an alternative to fossil fuel has attracted attention since the 1940s, when it was discovered that many microalgae species can produce large amounts of lipids. Economics and energy security were the motivational factors for a spurt in algae research during the 1970s, 1990s, and early 2000s. Whenever crude prices declined, research on algae stopped. The scenario today is different. Even given low and volatile crude prices ($30-$50/barrel), interest in algae continues all over the world. Algae, with their cure-all characteristics, have the potential to provide sustainable solutions to problems in the energy-food-climate nexus. However, after years of effort, there are no signs of algae-to-biofuel technology being commercialized. This article critically reviews past work; summarizes the current status of the technology; and based on the lessons learned, provides a balanced perspective on a potential path toward commercialization of algae-to-oil technology.

  6. Doenças infecciosas emergentes no Uruguai: memórias do século 20

    Directory of Open Access Journals (Sweden)

    María Hortal

    2017-02-01

    Full Text Available As doenças emergentes não são novos eventos epidemiológicos: existiram epidemias, mesmo no território uruguaio. A globalização com múltiplos fatores de intervenção acentuou o dinamismo biológico de agentes infecciosos e populações humanas. Considerando que uma doença emergente é causada por um novo agente ou que produz uma série de casos que excedem o número esperado, que invade uma área geográfica diferente ou reaparece após um desaparecimento prolongado, foram feitas tentativas para recuperar memórias de epidemias ocorridas no Uruguai durante o século XX. Também destacou o progresso do conhecimento sobre a biologia dos agentes infecciosos e seu controle. Muitas das doenças epidêmicas endêmicas das primeiras décadas do século, no final deste século foram controladas por vacinas. Há também surtos de outras doenças transmissíveis ou aparecem etiologias desconhecidas. Para obter toda essa informação, foi realizada uma revisão bibliográfica, mas foram encontradas relativamente poucas publicações de epidemias bacterianas ou virais. No entanto, a informação recuperada nos permitiu seguir o comportamento de doenças prevalentes, apreciar ao longo dos anos, a evolução de seus surtos epidêmicos, os sucessos e falhas de recursos para seu controle, bem como a capacidade de subsistência da maioria dos agentes infecciosos. No mundo e no Uruguai, durante o século 20, foi surpreendente expandir o conhecimento que, a partir de uma microbiologia incipiente, atingiu um alto nível científico / técnico que nos permitiu iniciar um novo século com possibilidades auspiciosas para enfrentar desafios persistentes e imprevisíveis.

  7. Orden de no reanimar, consideraciones sobre este problema

    Directory of Open Access Journals (Sweden)

    Dr. G. Luis Cereceda

    2011-05-01

    Se analizan los principales problemas, comenzando por las dificultades según los diferentes escenarios (servicio de urgencia, pabellón de maternidad, sala de hospitalizados, unidad de intensivo, pabellones quirúrgicos; se analiza la incertidumbre sobre el pronóstico de cada pacientes y sobre quién(es deben tomar las decisiones sobre el fin de la vida. Idealmente debe ser el paciente autónomo quien tome la decisión, pero en otros casos se requieren alternativas, una de ellas es la Orden Unilateral. Otros problemas son la Validez de las órdenes de no-RCP en los diferentes tiempos evolutivos, el problema de la Futilidad y la Validez de las “Directivas Anticipadas”, en este grupo resalta el enfoque POLST (Physician’s Order for Life Sustaining Treatment como más comprehensivo; como complemento ha surgido también el concepto AND (Allow Natural Death, que podría estar destinado a remplazar la orden de no-RCP (DNR.

  8. Production and characterization of algae extract from Chlamydomonas reinhardtii

    Directory of Open Access Journals (Sweden)

    Weston Kightlinger

    2014-01-01

    Conclusions: This study showed that algae extract derived from C. reinhardtii is similar, if not superior, to commercially available yeast extract in nutrient content and effects on the growth and metabolism of E. coli and S. cerevisiae. Bacto™ yeast extract is valued at USD $0.15–0.35 per gram, if algae extract was sold at similar prices, it would serve as a high-value co-product in algae-based fuel processes.

  9. Antimicrobial Activity of Extracts from Six Green Algae from Tanzania

    OpenAIRE

    Mtolera, M.S.P.; Semesi, A.

    1996-01-01

    Many algae species have been shown to have bactericidal or bacteriostatic substances (Glombitza, I979;Michaneck, 1979; Caccamese et al., 1980; Fenical & Paul, 1984; Niang& Hung, 1984). The antibacterialagents found in the algae include amino acids, terpenoids, phlorotannins, acrylic acid, phenoliccompounds, steroids, halogenated ketones and alkanes, cyclic polysulphides and fatty acids. In a large numberof marine algae antimicrobial activities are attributed to the presence of acrylic acid.

  10. Method and apparatus for iterative lysis and extraction of algae

    Science.gov (United States)

    Chew, Geoffrey; Boggs, Tabitha; Dykes, Jr., H. Waite H.; Doherty, Stephen J.

    2015-12-01

    A method and system for processing algae involves the use of an ionic liquid-containing clarified cell lysate to lyse algae cells. The resulting crude cell lysate may be clarified and subsequently used to lyse algae cells. The process may be repeated a number of times before a clarified lysate is separated into lipid and aqueous phases for further processing and/or purification of desired products.

  11. Genome Annotation and Transcriptomics of Oil-Producing Algae

    Science.gov (United States)

    2015-03-16

    AFRL-OSR-VA-TR-2015-0103 GENOME ANNOTATION AND TRANSCRIPTOMICS OF OIL-PRODUCING ALGAE Sabeeha Merchant UNIVERSITY OF CALIFORNIA LOS ANGELES Final...2010 To 12-31-2014 4. TITLE AND SUBTITLE GENOME ANNOTATION AND TRANSCRIPTOMICS OF OIL-PRODUCING ALGAE 5a. CONTRACT NUMBER FA9550-10-1-0095 5b...NOTES 14. ABSTRACT Most algae accumulate triacylglycerols (TAGs) when they are starved for essential nutrients like N, S, P (or Si in the case of some

  12. Accumulation of 210Po by benthic marine algae

    International Nuclear Information System (INIS)

    Gouvea, R.C.; Branco, M.E.C.; Santos, P.L.

    1988-01-01

    The accumulation of polonium 210 Po by various species of benthic marine seaweeds collected from 4 different points on the coast of Rio de Janeiro, showed variations by species and algal groups. The highest value found was in red alga, Plocamium brasiliensis followed by other organisms of the same group. In the group of the brown alga, the specie Sargassum stenophylum was outstanding. The Chlorophyta presented the lowest content of 210 Po. The algae collected in open sea, revealed greater concentration factors of 210 Po than the same species living in bays. The siliceous residue remaining after mineralization of the algae did not interfere with the detection of polonium. (author)

  13. Algae Bioreactor Using Submerged Enclosures with Semi-Permeable Membranes

    Science.gov (United States)

    Trent, Jonathan D (Inventor); Gormly, Sherwin J (Inventor); Embaye, Tsegereda N (Inventor); Delzeit, Lance D (Inventor); Flynn, Michael T (Inventor); Liggett, Travis A (Inventor); Buckwalter, Patrick W (Inventor); Baertsch, Robert (Inventor)

    2013-01-01

    Methods for producing hydrocarbons, including oil, by processing algae and/or other micro-organisms in an aquatic environment. Flexible bags (e.g., plastic) with CO.sub.2/O.sub.2 exchange membranes, suspended at a controllable depth in a first liquid (e.g., seawater), receive a second liquid (e.g., liquid effluent from a "dead zone") containing seeds for algae growth. The algae are cultivated and harvested in the bags, after most of the second liquid is removed by forward osmosis through liquid exchange membranes. The algae are removed and processed, and the bags are cleaned and reused.

  14. Importance of algae oil as a source of biodiesel

    International Nuclear Information System (INIS)

    Demirbas, Ayhan; Fatih Demirbas, M.

    2011-01-01

    Algae are the fastest-growing plants in the world. Industrial reactors for algal culture are open ponds, photobioreactors and closed systems. Algae are very important as a biomass source. Algae will some day be competitive as a source for biofuel. Different species of algae may be better suited for different types of fuel. Algae can be grown almost anywhere, even on sewage or salt water, and does not require fertile land or food crops, and processing requires less energy than the algae provides. Algae can be a replacement for oil based fuels, one that is more effective and has no disadvantages. Algae are among the fastest-growing plants in the world, and about 50% of their weight is oil. This lipid oil can be used to make biodiesel for cars, trucks, and airplanes. Microalgae have much faster growth-rates than terrestrial crops. the per unit area yield of oil from algae is estimated to be from 20,000 to 80,000 l per acre, per year; this is 7-31 times greater than the next best crop, palm oil. The lipid and fatty acid contents of microalgae vary in accordance with culture conditions. Most current research on oil extraction is focused on microalgae to produce biodiesel from algal oil. Algal-oil processes into biodiesel as easily as oil derived from land-based crops.

  15. Method and apparatus for lysing and processing algae

    Science.gov (United States)

    Chew, Geoffrey; Reich, Alton J.; Dykes, Jr., H. Waite H.; Di Salvo, Roberto

    2013-03-05

    Methods and apparatus for processing algae are described in which a hydrophilic ionic liquid is used to lyse algae cells at lower temperatures than existing algae processing methods. A salt or salt solution is used as a separation agent and to remove water from the ionic liquid, allowing the ionic liquid to be reused. The used salt may be dried or concentrated and reused. The relatively low lysis temperatures and recycling of the ionic liquid and salt reduce the environmental impact of the algae processing while providing biofuels and other useful products.

  16. Algae and cyanobacteria on painted surfaces in Southern Brazil Algas e cianobactérias em superfícies pintadas no Sul do Brasil

    Directory of Open Access Journals (Sweden)

    Peter M. Gaylarde

    1999-07-01

    Full Text Available Algae and cyanobacteria disfigure the external surfaces of buildings and may cause their physico-chemical deterioration. Even though the climate in Brazil is humid, there is no published literature on this problem. The objective of this work was to identify the major phototrophs present on Brazilian constructions in residential, urban and rural sites. The algal and cyanobacterial types present on discolored surfaces of painted buildings in nine different municipalities in Brazil, all lying between latitudes 19° South and 30° South, were examined. A total of 816 different organisms was detected in 58 sites. Approximately 63% were single-celled or colonial organisms. The cyanobacterial genus, Synechocystis, was the most biodiverse and frequently comprised the major biomass. It was present in 63.4% of sites. Second and third most frequently detected were Oscillatoria and the algal genus, Chlorella, respectively. The latter organism showed the most widespread occurrence (72.4%. Cyanobacteria were the most important colonizers, especially at urban sites, where over 62% of the organisms detected belonged to this class. Filamentous phototrophs were found in smaller numbers than non-filamentous at all locations.Algas e cianobactérias produzem coloração nas superfícies externas de construções e podem causar a sua deterioração físico-química. Apesar a clima úmida do Brasil, não existe no pais uma literatura sobre este problema. O objetivo deste trabalho foi identificar os microrganismos fototróficos mais importantes nas superfícies de construções, em áreas residenciais, urbanas e rurais do Brasil. Foram avaliados os tipos de algas e cianobactérias presentes em superfícies pintadas coloradas, em nove municípios do Brasil localizados entre 19° Sul e 30° Sul. Aproximadamente 63% destes foram células simples, ou organismos coloniais. O gênero, Synechocystis, foi o organismo que mostrou-se o mais diverso e, frequentemente, compõe a

  17. Violencia intrafamiliar en estudiantes de primer año de la Escuela Emergente de Enfermería

    Directory of Open Access Journals (Sweden)

    Margarita Díaz Lemus

    Full Text Available Introducción: la familia como célula fundamental de la sociedad, tiene entre sus funciones la educación de las nuevas generaciones. En ella pueden aparecer episodios de violencia intrafamiliar que resultan difíciles de identificar y de afrontar por los adolescentes. Objetivos: identificar la presencia de violencia en las familias de los estudiantes de enfermería de primer año de la Escuela de Formación Emergente de Enfermería, así como determinar la relación entre el agresor y los tipos de violencia intrafamiliar. Métodos: se realizó una investigación descriptiva de corte transversal. El universo estuvo constituido por 101 estudiantes de la sede del municipio Cotorro. La muestra fue de 72 estudiantes que reconocieron la presencia de violencia intrafamiliar en sus hogares. Se utilizaron métodos teóricos de revisión documental y métodos empíricos de grupos focales y encuesta. Resultados: existe violencia intrafamiliar en la mayoría de los hogares de los estudiantes estudiados, donde los padres y las madres son los agresores fundamentales. Conclusiones: las manifestaciones de violencia intrafamiliar más representadas fueron el abuso emocional y la agresión física.

  18. Hacia la construcción de conocimiento emergente para la gestión local del riesgo

    Directory of Open Access Journals (Sweden)

    Yolanda Hernández Peña

    2015-01-01

    Full Text Available El presente artículo tiene como objetivo refleexionar sobre la necesidad de generar procesos de construcción de conocimiento emergente para analizar e incidir en los escenarios de riesgo. Las refleexiones surgen de lo hallado durante la investigación para la tesis doctoral de geografía “Análisis de imaginarios y percepciones asociados a fenómenos naturales para una adecuada gestión del riesgo”, realizada con un enfoque etnográfico, en distintos escenarios de riesgo del país, como inundaciones, erupciones volcánicas, movimientos en masa y sismos. El resultado es una propuesta que permite relacionar el conocimiento local con el técnico, y facilita el entendimiento de los diversos vínculos entre los fenómenos naturales y los grupos sociales establecidos en sus zonas de influuencia, así como ofrecer orientaciones que enriquezcan la gestión del riesgo.

  19. Relaciones diferenciales entre experiencias de alfabetización y habilidades de alfabetización emergente

    Directory of Open Access Journals (Sweden)

    Liliana Salazar-Reyes

    2013-08-01

    Full Text Available El objetivo del estudio fue investigar si las experiencias de alfabetización que los padres brindan se relacionan diferencialmente con la alfabetización de los niños. A partir de una muestra intencional, se seleccionaron treinta y cuatro diadas madre-hijo al inicio de preescolar, procedentes de una escuela particular del Estado de México. Se presenta evidencia que considera en un mismo estudio el análisis de las experiencias explícitas e implícitas observadas en una sesión de interacción madre-hijo, haciendo uso de diferentes materiales, y otro tipo de experiencias de alfabetización reportadas por las madres. Ambos resultados se complementaron para comparar los puntajes obtenidos por los niños en las pruebas de alfabetización emergente. Se constataron diferencias significativas en la alfabetización debidas a la escolaridad del padre t(11 = 2,78, p = 0,019; el acercamiento a los libros t(12 = 3,90, p = 0,001, y la frecuencia de lectura de cuentos t(12 = 4,31, p = 0,002. A partir de los resultados se concluye que algunos niños tienen habilidades de alfabetización desde muy temprana edad como resultado de las experiencias que sus padres les proporcionan.

  20. Chloroplast division checkpoint in eukaryotic algae

    Science.gov (United States)

    Sumiya, Nobuko; Fujiwara, Takayuki; Era, Atsuko; Miyagishima, Shin-ya

    2016-01-01

    Chloroplasts evolved from a cyanobacterial endosymbiont. It is believed that the synchronization of endosymbiotic and host cell division, as is commonly seen in existing algae, was a critical step in establishing the permanent organelle. Algal cells typically contain one or only a small number of chloroplasts that divide once per host cell cycle. This division is based partly on the S-phase–specific expression of nucleus-encoded proteins that constitute the chloroplast-division machinery. In this study, using the red alga Cyanidioschyzon merolae, we show that cell-cycle progression is arrested at the prophase when chloroplast division is blocked before the formation of the chloroplast-division machinery by the overexpression of Filamenting temperature-sensitive (Fts) Z2-1 (Fts72-1), but the cell cycle progresses when chloroplast division is blocked during division-site constriction by the overexpression of either FtsZ2-1 or a dominant-negative form of dynamin-related protein 5B (DRP5B). In the cells arrested in the prophase, the increase in the cyclin B level and the migration of cyclin-dependent kinase B (CDKB) were blocked. These results suggest that chloroplast division restricts host cell-cycle progression so that the cell cycle progresses to the metaphase only when chloroplast division has commenced. Thus, chloroplast division and host cell-cycle progression are synchronized by an interactive restriction that takes place between the nucleus and the chloroplast. In addition, we observed a similar pattern of cell-cycle arrest upon the blockage of chloroplast division in the glaucophyte alga Cyanophora paradoxa, raising the possibility that the chloroplast division checkpoint contributed to the establishment of the permanent organelle. PMID:27837024

  1. Interactions between arsenic species and marine algae

    Energy Technology Data Exchange (ETDEWEB)

    Sanders, J.G.

    1978-01-01

    The arsenic concentration and speciation of marine algae varies widely, from 0.4 to 23 ng.mg/sup -1/, with significant differences in both total arsenic content and arsenic speciation occurring between algal classes. The Phaeophyceae contain more arsenic than other algal classes, and a greater proportion of the arsenic is organic. The concentration of inorganic arsenic is fairly constant in macro-algae, and may indicate a maximum level, with the excess being reduced and methylated. Phytoplankton take up As(V) readily, and incorporate a small percentage of it into the cell. The majority of the As(V) is reduced, methylated, and released to the surrounding media. The arsenic speciation in phytoplankton and Valonia also changes when As(V) is added to cultures. Arsenate and phosphate compete for uptake by algal cells. Arsenate inhibits primary production at concentrations as low as 5 ..mu..g.1/sup -1/ when the phosphate concentration is low. The inhibition is competitive. A phosphate enrichment of > 0.3 ..mu..M alleviates this inhibition; however, the As(V) stress causes an increase in the cell's phosphorus requirement. Arsenite is also toxic to phytoplankton at similar concentrations. Methylated arsenic species did not affect cell productivity, even at concentrations of 25 ..mu..g.1/sup -1/. Thus, the methylation of As(V) by the cell produces a stable, non-reactive compound which is nontoxic. The uptake and subsequent reduction and methylation of As(V) is a significant factor in determining the arsenic biogeochemistry of productive systems, and also the effect that the arsenic may have on algal productivity. Therefore, the role of marine algae in determining the arsenic speciation of marine systems cannot be ignored. (ERB)

  2. Snow algae and lichen algae differ in their resistance to freezing temperature: An ice nucleation study

    Czech Academy of Sciences Publication Activity Database

    Hajek, J.; Kvíderová, Jana; Worland, R.; Barták, M.; Elster, Josef; Vaczi, P.

    2009-01-01

    Roč. 48, č. 4 (2009), s. 37-38 ISSN 0031-8884. [International Phycological Congress /9./. 02.08.2009-08.08.2009, Tokyo] R&D Projects: GA AV ČR IAA600050702; GA AV ČR KJB601630808 Institutional research plan: CEZ:AV0Z60050516 Keywords : ice nucleation * algae * freezing Subject RIV: EF - Botanics

  3. Ammonium removal using algae-bacteria consortia: the effect of ammonium concentration, algae biomass, and light.

    Science.gov (United States)

    Jia, Huijun; Yuan, Qiuyan

    2018-04-01

    In this study, the effects of ammonium nitrogen concentration, algae biomass concentration, and light conditions (wavelength and intensity) on the ammonium removal efficiency of algae-bacteria consortia from wastewater were investigated. The results indicated that ammonium concentration and light intensity had a significant impact on nitrification. It was found that the highest ammonia concentration (430 mg N/L) in the influent resulted in the highest ammonia removal rate of 108 ± 3.6 mg N/L/days, which was two times higher than the influent with low ammonia concentration (40 mg N/L). At the lowest light intensity of 1000 Lux, algae biomass concentration, light wavelength, and light cycle did not show a significant effect on the performance of algal-bacterial consortium. Furthermore, the ammonia removal rate was approximately 83 ± 1.0 mg N/L/days, which was up to 40% faster than at the light intensity of 2500 Lux. It was concluded that the algae-bacteria consortia can effectively remove nitrogen from wastewater and the removal performance can be stabilized and enhanced using the low light intensity of 1000 Lux that is also a cost-effective strategy.

  4. Toxicity of chlorinated benzenes to marine algae

    Science.gov (United States)

    Ma, Yan-Jun; Wang, Xiu-Lin; Yu, Wei-Jun; Zhang, Li-Jun; Sun, Han-Zhang

    1997-12-01

    Growth of Chlorella marine, Nannochloropsis oculata, Pyramidomonas sp., Platymonas subcordiformis and Phaeodactylum tricornutum exposed to monochlorobenzene (MCB), 1,2-dichlorobenzene (1,2-DCB), 1, 2, 3, 4-tetrachlorobenzene (1, 2, 3, 4-TeCB) and pentachlorobenzene (PeCB) was tested. Tests of 72 h- EC 50 values showed that the toxicity ranged in the order: MCBNannochloropsis oculata < Chlorella marine < Phaeodactylum tricomutum. Study of the QSAR (Quantitative Structure-Activity Relationship) between K OW and toxicity of CBs to marine algae showed good relationships between -log EC 50 and log K OW.

  5. Diterpenes from the Brown Alga Dictyota crenulata

    Directory of Open Access Journals (Sweden)

    Valéria Laneuville Teixeira

    2008-06-01

    Full Text Available The crude extract of the Brazilian brown alga Dictyota crenulata was analyzed by NMR spectroscopy and HRGC-MS techniques. Seven diterpenes were identified: pachydictyol A, dictyodial, 4β-hydroxydictyodial A, 4β-acetoxydictyodial A, isopachydictyol A, dictyol C and dictyotadiol. Xeniane diterpenes have previously been found in D. crenulata from the Pacific Ocean. The results characterize D. crenulata as a species that provides prenylated guaiane (group I and xeniane diterpenes (group III, thus making it a new source of potential antiviral products.

  6. Problemas de investigación en contabilidad y problemas de la investigación en contabilidad

    Directory of Open Access Journals (Sweden)

    Henry Antonio Romero León

    2015-01-01

    Full Text Available En este escrito se plantean dos problemáticas que padece el mundo contable en su concepción de la investigación y en la ejecución de la misma como proceso dinamizador de la disciplina. Se precisan problemas de investigación y problemas de la investigación contable, que derivan en el diagnóstico y descripción de aspectos generadores de trabas en la investigación. A manera de ejemplo se presentan investigaciones en orden de las grandes temáticas de investigación a través de las revistas académicas más representativas con la intención de evidenciar la investigación contable mundial. La problemática que guía la argumentación es la necesidad de distinguir dos ejes problemáticos en la investigación contable que hacen de este ejercicio una actividad que históricamente marcha a pasos lentos, buscando así comprender que con las aclaraciones conceptuales y analíticas en las concepciones que gobiernan el conocimiento contable, se pueda contribuir al desempantanamiento de este asunto. Se logra establecer que no es lo mismo los problemas como motivadores de la investigación, que los problemas que giran alrededor de la investigación como actividad humana.Palabras Clave: problemas de investigación en contabilidad; problemas de la investigación en contabilidad epistemología contable; ontología contable; investigación; problema; giro epistemológico.Research problems in accounting and problems in accounting research.AbstractThere are two questions being raised here regarding the accounting research and foundational research problems in accounting as a dynamizing agent of the discipline progress. Research problems in accounting and problems in accounting research derived therein have been discussed, through a diagnostic process, including a description of the main issues in these problematic research areas. By way of example, research topics published in the main accounting journals will be presented, with the intent to overview the

  7. Um problema de corte com padrões compartimentados

    Directory of Open Access Journals (Sweden)

    Robinson Hoto

    2003-01-01

    Full Text Available Neste artigo apresentaremos a aplicação do Problema da Mochila Compartimentada (PMC no Problema de Corte de Bobinas de Aço (PCBA, que é um problema de corte em duas etapas com restrições especiais de agrupamento dos itens. O PMC consiste em construir compartimentos de capacidades desconhecidas em uma mochila de capacidade conhecida, tendo em vista que os itens de interesse estão agrupados em subconjuntos, de modo que, itens de um agrupamento não podem ser combinados com itens de outro. Para entender melhor o PMC admita que a mochila de um alpinista deve ser composta por um número ideal de compartimentos com itens de quatro categorias (remédios, alimentos, ferramentas, roupas, porém, itens de categorias distintas não podem ser combinados para formar um mesmo compartimento, além do mais, são desconhecidas as capacidades ideais de cada compartimento da mochila.In this paper we will present the application of the Compartmented Knapsack Problem (CKP in the Cut Problem of Steel Rolls (CPSR, that it is a problem of cut in two stages with restrictions special of grouping of items. The CKP consists of constructing compartments of unknown capacities in a knapsack of known capacity, in view of that items of interest is grouped in subgroups, in mode that, items of a grouping cannot be matched with items of another one. To understand the CKP more good it admits that the knapsack of a alpinist must be composite for an ideal number of compartments with items of four categories (remedies, foods, tools, clothes, however, items of distinct categories cannot be matched to form one same compartment, in addition, is unknown the ideal capacities of each compartment of the knapsack.

  8. Algae-based oral recombinant vaccines

    Directory of Open Access Journals (Sweden)

    Elizabeth A Specht

    2014-02-01

    Full Text Available Recombinant subunit vaccines are some of the safest and most effective vaccines available, but their high cost and the requirement of advanced medical infrastructure for administration make them impractical for many developing world diseases. Plant-based vaccines have shifted that paradigm by paving the way for recombinant vaccine production at agricultural scale using an edible host. However, enthusiasm for molecular pharming in food crops has waned in the last decade due to difficulty in developing transgenic crop plants and concerns of contaminating the food supply. Microalgae are poised to become the next candidate in recombinant subunit vaccine production, and they present several advantages over terrestrial crop plant-based platforms including scalable and contained growth, rapid transformation, easily obtained stable cell lines, and consistent transgene expression levels. Algae have been shown to accumulate and properly fold several vaccine antigens, and efforts are underway to create recombinant algal fusion proteins that can enhance antigenicity for effective orally-delivered vaccines. These approaches have the potential to revolutionize the way subunit vaccines are made and delivered – from costly parenteral administration of purified protein, to an inexpensive oral algae tablet with effective mucosal and system immune reactivity.

  9. Energy from algae using microbial fuel cells

    KAUST Repository

    Velasquez-Orta, Sharon B.

    2009-08-15

    Bioelectricity production froma phytoplankton, Chlorella vulgaris, and a macrophyte, Ulva lactuca was examined in single chamber microbial fuel cells (MFCs). MFCs were fed with the two algae (as powders), obtaining differences in energy recovery, degradation efficiency, and power densities. C. vulgaris produced more energy generation per substrate mass (2.5 kWh/kg), but U. lactuca was degraded more completely over a batch cycle (73±1% COD). Maximum power densities obtained using either single cycle or multiple cycle methods were 0.98 W/m2 (277 W/m3) using C. vulgaris, and 0.76 W/m2 (215 W/m3) using U. lactuca. Polarization curves obtained using a common method of linear sweep voltammetry (LSV) overestimated maximum power densities at a scan rate of 1 mV/s. At 0.1 mV/s, however, the LSV polarization data was in better agreement with single- and multiple-cycle polarization curves. The fingerprints of microbial communities developed in reactors had only 11% similarity to inocula and clustered according to the type of bioprocess used. These results demonstrate that algae can in principle, be used as a renewable source of electricity production in MFCs. © 2009 Wiley Periodicals, Inc.

  10. Algae-based oral recombinant vaccines

    Science.gov (United States)

    Specht, Elizabeth A.; Mayfield, Stephen P.

    2014-01-01

    Recombinant subunit vaccines are some of the safest and most effective vaccines available, but their high cost and the requirement of advanced medical infrastructure for administration make them impractical for many developing world diseases. Plant-based vaccines have shifted that paradigm by paving the way for recombinant vaccine production at agricultural scale using an edible host. However, enthusiasm for “molecular pharming” in food crops has waned in the last decade due to difficulty in developing transgenic crop plants and concerns of contaminating the food supply. Microalgae could be poised to become the next candidate in recombinant subunit vaccine production, as they present several advantages over terrestrial crop plant-based platforms including scalable and contained growth, rapid transformation, easily obtained stable cell lines, and consistent transgene expression levels. Algae have been shown to accumulate and properly fold several vaccine antigens, and efforts are underway to create recombinant algal fusion proteins that can enhance antigenicity for effective orally delivered vaccines. These approaches have the potential to revolutionize the way subunit vaccines are made and delivered – from costly parenteral administration of purified protein, to an inexpensive oral algae tablet with effective mucosal and systemic immune reactivity. PMID:24596570

  11. Psicologia do esporte: uma área emergente da psicologia Psicología del deporte: un area emergente de la psicología Sport psychology: an emergent field in psychology

    Directory of Open Access Journals (Sweden)

    Lenamar Fiorese Vieira

    2010-06-01

    Full Text Available O artigo trata da Psicologia do Esporte, um campo de atuação emergente do psicólogo no Brasil. Faz uma análise sobre o percurso histórico da Psicologia Esportiva apresentando os campos de atuação profissional (pesquisa, ensino e intervenção, o papel do psicólogo esportivo (pesquisador, professor e consultor e o estado científico atual dessa especialidade psicológica. Mesmo com o vasto campo de trabalho, um elemento interveniente é a diversidade de conhecimentos necessários para esta subdivisão da Psicologia, fazendo com que a formação profissional seja insuficiente e a atuação profissional dividida em duas especialidades, a Psicologia Clínica e a Psicologia Educacional aplicada ao esporte. Finalizando, destaca-se a emergência da compreensão destes aspectos, fornecendo subsídios para o entendimento da importância da qualificação de profissionais da área da Psicologia para o contexto do esporte e do exercício físico.El artículo presenta el área de la psicología del deporte como un campo de actuación emergente del psicólogo en Brasil. Hace un análisis del recorrido histórico de la Psicología Deportiva presentando las áreas de actuación profesional (pesquisa, enseñanza e intervención, el papel del psicólogo deportivo (investigador, profesor y consultor y el estado científico actual del área. Mismo con el vasto campo de trabajo, un elemento interventor es la diversidad de conocimientos necesarios para esta subdivisión de la psicología, haciendo con que la formación profesional sea insuficiente y la actuación profesional sea dividida en dos especialidades, la Psicología Clínica y la Psicología Educacional aplicada al deporte. Finalizando, se destaca la emergencia de la comprensión de estos aspectos, proporcionando subsidios para o entendimiento de la importancia de la calificación del profesional del área de la Psicología para el contexto del deporte y del ejercicio.This manuscript presents the

  12. Isolation and Characterization of Blue Green Algae from Egyptian ...

    African Journals Online (AJOL)

    meldemellawy

    2014-02-20

    Feb 20, 2014 ... aminotransferase (AMT) domains of the mycE and ndaF genes (Jungblut et al., 2006) allowing detection of microcystin and nodularin-producing cyanobacteria. MATERIALS AND METHODS. Isolation and cultivation of blue green algae. Blue green algae had been isolated from soil of Rice field in river.

  13. Monetary value of the impacts of filamentous green algae on ...

    African Journals Online (AJOL)

    This paper presents estimates of the monetary value of the impact of eutrophication (algae) on commercial agriculture in two different catchments in South Africa. A production function approach is applied to estimate the monetary value of the impact of filamentous green algae on commercial agriculture in the Dwars River, ...

  14. Dissolved Air Flotation Process for Algae Removal | Mulaku ...

    African Journals Online (AJOL)

    This study investigated the performance of the Dissolved Air Flotation (DAF) process as an alternative to sedimentation for algae removal in surface water treatment in Kenya. Batch DAF experiments were carried out in the laboratory using algae laden surface water samples collected from the river and laboratory cultured ...

  15. Persistence and proliferation of some unicellular algae in drinking ...

    African Journals Online (AJOL)

    Drinking water systems have a complex structure and are characterised by the absence of light, the presence of disinfectants and by low levels of nutrients. Several kinds of bacteria, protozoa, algae and fungi can be found in tap water. Little is known about the ecology of algae in drinking water systems, although their ...

  16. Algae Cultivation for Carbon Capture and Utilization Workshop Summary Report

    Energy Technology Data Exchange (ETDEWEB)

    None, None

    2017-05-01

    The Algae Cultivation for Carbon Capture and Utilization Workshop Summary Report summarizes a workshop hosted by the U.S. Department of Energy's Bioenergy Technologies Office on May 23–24, 2017, in Orlando, Florida. The event gathered stakeholder input through facilitated discussions focused on innovative technologies and business strategies for growing algae on waste carbon dioxide resources.

  17. Study on the effect of irradiation on algae by proteomics

    International Nuclear Information System (INIS)

    Choi, Jong Il; Yoon, Yo Han; Kim, Jae Hun

    2010-06-01

    Algae has been utilized as food material from long time ago, and recently newly recognized as functional materials and the source of bio-fuel. But, the study on the algae is just beginning and the study on protein expression and growth by the change of condition was not reported. In this study, the effect of radiation on the protein expression was investigated for the protection mechanisms and new genome source and furthermore, isolation of new mutant strains. To monitor the growth of algae, absorbance and FDA staining methods were developed and the content of lipid of algae species were measured. With these methods, the radiation sensitivity of algae species was determined. To investigate the proteome of algae, 2D-electrophoresis methods was applied. From the comparison of proteomes, the radiation specific expressed protein was identified as thioredoxin-h and its nucleotide sequences was defined. The expression of thioredoxin-h was further defined on the mRNA level. Also, the extract of algae species was analyzed for its antioxidant activity and polyphenolic content. The changes in antioxidant activity of extract by radiation was investigated. From the radiation experiments, mutant Spirogyra species having higher resistant against radical stress was obtained. The mutant strain has higher antioxidant activity. This results can provide the proteome date and mutation technology of algae and further contribute in the activation of fishery industry and national health enhancement

  18. EnAlgae Decision Support Toolset: model validation

    NARCIS (Netherlands)

    Kenny, Philip; Visser, de Chris; Skarka, Johannes; Sternberg, Kirstin; Schipperus, Roelof; Silkina, Alla; Ginnever, Naomi

    2015-01-01

    One of the drivers behind the EnAlgae project is recognising and addressing the need for increased availability of information about developments in applications of algae biotechnology for energy, particularly in the NW Europe area, where activity has been less intense than in other areas of the

  19. Evaluation of the activated carbon prepared from the algae ...

    African Journals Online (AJOL)

    Evaluation of the activated carbon prepared from the algae Gracilaria for the biosorption of Cu(II) from aqueous solutions. ... African Journal of Biotechnology ... This study shows the benefit of using activated carbon from marine red algae as a low cost sorbent for the removal of copper from aqueous solution wastewater.

  20. Potential of wastewater grown algae for biodiesel production and CO

    African Journals Online (AJOL)

    Potential of wastewater grown algae for biodiesel production and CO 2 sequestration. ... African Journal of Biotechnology ... Mixed algae sample showed the highest CO2 fixation rate, followed by Chlorella sp., Scenedesmus incrassatulus, Scenedesmus dimorphus and Chroococcus cohaerens (2.807, 1.627, 1.501, 1.270 ...

  1. Rare species of fungi parasiting on algae. III.

    Directory of Open Access Journals (Sweden)

    Joanna Z. Kadłubowska

    2014-08-01

    Full Text Available The investigations csrried out on algae revealed the following species of fungi from the order of Chytridialis Hawksworth et al. (1995 parasitizing on algae: Rhizophydium subgulosum, R. ganlosporum, R. planctonicum, Entophlyctis rhizina and Harpochytrium hedinii. These species arc new to Poland. The figure of resting spore of Entophlyctis rhizina is the fint graphic documentation of this species.

  2. Rare species of fungi parasiting on algae. III.

    OpenAIRE

    Joanna Z. Kadłubowska

    2014-01-01

    The investigations csrried out on algae revealed the following species of fungi from the order of Chytridialis Hawksworth et al. (1995) parasitizing on algae: Rhizophydium subgulosum, R. ganlosporum, R. planctonicum, Entophlyctis rhizina and Harpochytrium hedinii. These species arc new to Poland. The figure of resting spore of Entophlyctis rhizina is the fint graphic documentation of this species.

  3. Insuficiente seguridad de la sangre: un problema global

    OpenAIRE

    Instituto Nacional de Salud

    2005-01-01

    Carta del Editor de la Revista Clinical Laboratory, Marzo de 2005, Frances Bushrod, Ph.D A propósito de los recientes problemas que se han conocido y difundido en nuestro país a través de los medios de comunicación, en cuanto a la seguridad de las transfusiones sanguíneas, hemos considerado pertinente compartir con nuestros lectores una carta editorial elaborada por la doctora Frances Bushrod, Ph.D. y publicada en la Revista Clinical Laboratory, en la que da cuenta de la situación mundial ...

  4. La agricultura peruana: problemas, potencialidades y políticas

    OpenAIRE

    Adolfo Figueroa

    1986-01-01

    El presente trabajo tiene por objeto presentar, primero, los problemas estructurales de la agricultura peruana, luego sus potencialidades y, finalmente, los elementos para el diseño de políticas económicas. Debo admitir que este objetivo es muy ambicioso para ser desarrollado en un artículo y por un investigador individual. Por ello espero que el artículo logre, más bien, ordenar los elementos básicos para la discusión de la política económica dirigida al desarrollo agrícola del Perú....

  5. Los detectives salvajes y el problema de sujeto

    OpenAIRE

    Muñoz, Casallas

    2014-01-01

    Este trabajo constituye una descripción densa que interpreta el problema del sujeto en diálogo con la novela hispanoamericana Los detectives salvajes. Se trata de un experimento interdisciplinario que señala en una dirección holística y cuya rigurosidad descansa en el fuerte carácter empírico del objeto tratado. Hay algunos juegos literarios que resuenan con la novela abordada y avanzan hacia una crítica auto - reflexiva de la institucionalidad académica, arriesgando una suerte de hipertexto ...

  6. Clases de cachorros y problemas de comportamiento en perros

    OpenAIRE

    González Alonso, Almudena

    2017-01-01

    Traballo Fin de Grao en Veterinaria. Curso 2016-2017 [ES] Los perros que son debidamente socializados durante las primeras semanas de vida son menos propensos a la aparición de problemas de comportamiento, que pueden deteriorar el vínculo propietario-animal y provocar el abandono y eutanasia de las mascotas. La evidencia de los beneficios de las clases de cachorros no está tan clara, algunos estudios muestran que las clases impactan positivamente en el comportamiento de los adultos, reduci...

  7. La obesidad, un problema de salud pública

    OpenAIRE

    Cristina Barroso Camiade

    2012-01-01

    Este trabajo analiza la situación de la obesidad en México como un problema de salud pública y la forma como el gobierno federal busca abatirlo a través del diseño de una campaña publicitaria que no toma en cuenta el contexto sociocultural de la población, de tal forma que los logros alcanzados por ésta no se traducen en un cambio de actitudes o hábitos en aras de ejemplificarlo, se realizará un análisis de la campaña ¿5 Pasos¿.

  8. El problema de la libertad humana en kant

    OpenAIRE

    Hoyos Vásquez, Guillermo

    2011-01-01

    El título de este trabajo, el problema de la libertad humana enKant, pretende señalar él mismo la perspectiva desde la cual se debe abordar el tema de la libertad en la obra de Kant y también hoy para nosotros.  La libertad es una idea o un concepto problemático. Es problemático con respecto al concepto de naturaleza y de conocimiento científico, en cuanto este tipo de conocimiento tiene características deconocimiento exacto, preciso y legal, características que no puede ofrecer el discurso s...

  9. Contenido de sulfato de calcio en un yeso. Problema interactivo.

    OpenAIRE

    Milla González, Miguel

    2008-01-01

    Para resolver el problema de determinación cuantitativa de sulfato de calcio en un yeso o perlita yesada, se generan los datos de pesada de muestra sólida y el valor de la absorbancia de la alícuota de muestra disuelta. Primero deberá comprobarse que la muestra pesada, al ser disuelta en un volumen dado de agua desionizada, permite la solubilización completa de la sal sulfato de calcio (comparación de los productos de las concentraciones iónicas con el valor del producto de solubilidad).Si es...

  10. Materiales en ingeniería : problemas resueltos

    OpenAIRE

    Cabrera Marrero, José M.

    2000-01-01

    En este libro se han planteado una serie de problemas complementarios al temario de la asignatura de Materiales, divididos en seis grandes apartados: 1. Estructura cristalina. 2. Propiedades físicas de los materiales. 3. Materiales poliméricos. 4. Diagramas de equilibrio. 5. Propiedades mecánicas de los materiales. 6. Metalografía. Los autores han pretendido que este libro sea de utilidad para el conocimiento y la comprensión de los materiales a partir del planteamiento y la resolución de pro...

  11. Donar: ¿Un problema bioético?

    OpenAIRE

    Ángel Alonso Salas

    2017-01-01

    El filósofo australiano, Peter Singer escribió un texto que se titula Salvar una vida. Cómo terminar con la pobreza que hace referencia a los motivos que se tienen para que las personas efectúen donaciones y el deber que el ser humano tiene para ayudar a los más necesitados. En este sentido, el presente texto tiene como finalidad, preguntarse acerca del problema bioético que supone el que un sujeto o una institución otorguen algún tipo de donación, bajo el supuesto de ¿cuáles son los motivos ...

  12. Santiago del Estero y el problema de los minifundios

    OpenAIRE

    Starck, Emilie

    2011-01-01

    Santiago del Estero ocupa a diario los noticieros por los asuntos de desalojos de campesinos. Con el récord nacional de explotaciones sin límites definidos, la provincia vuelve a ser la protagonista de un conflicto de tierra agresivo. La marginalidad territorial de los pequeños productores sin título de propiedad, junto a la expansión sojera sobre tierras semiáridas, vuelven a actualizar los problemas ligados a la “anarquía territori...

  13. Helicobacter pylori y dispepsia, un problema de salud comunitario

    OpenAIRE

    Miguel González-Carbajal Pascual; Ludmila Concepción Izaguirre

    2002-01-01

    Mientras la relación causal entre el Helicobacter pylori y la gastritis crónica, así como la importante conexión entre esta infección, la úlcera gastroduodenal y el cáncer gástrico han sido bien establecidas, la asociación entre la infección por Helicobacter pylori y la dispepsia "no ulcerosa" es un problema que dista mucho de estar esclarecido. Hay autores que no dudan en utilizar tratamiento de erradicación en la dispepsia "no ulcerosa" con Helicobacter pylori, pero existen enfoques alterna...

  14. Factores Asociados a problemas de conducta en prescolares

    OpenAIRE

    Huiracocha T., Lourdes

    2013-01-01

    Objetivo: Determinar la prevalencia de preescolares con problemas de conducta en el aula de los Centros Municipales de Desarrollo Infantil de Cuenca y sus factores asociados. Disen?o Metodolo?gico: Disen?o anali?tico transversal, muestra aleatoria estratificada (frecuencia 10%, error de inferencia 3%, confianza 99%, pe?rdidas 20%: n=270/N=329). Los datos fueron recolectados por observacio?n a los nin?os (Conners abreviado para profesores), por encuesta al cuidador (test de apgar familiar) y a...

  15. Trabajo infantil y problemas del comportamiento en menores trabajadores

    OpenAIRE

    Cardenas Ramirez, Luz Stella

    2016-01-01

    Objetivo: Identificar la relación de los factores de riesgo ocupacional del trabajo infantil con los problemas de comportamiento en menores de edad trabajadores de una plaza de mercado en Colombia Materiales y métodos: Se realizó un estudio de corte transversal con 100 niños trabajadores de la plaza de Mercaneiva. Se aplicó un cuestionario para evaluar los factores ocupacionales en la población, evaluando aspectos sociodemográficos y condiciones laborales; para establecer la prevalencia d...

  16. Cien problemas de programación lineal.

    OpenAIRE

    Jiménez Lozano , Guillermo; Quesada Ibargüen , Víctor Manuel

    2006-01-01

    El presente escrito tiene la intención de servir a las personas dedicadas al planteamiento de modelos de Programación Lineal, en especial a los estudiantes que cursan Investigación de Operaciones I. Se aspira a que en este volumen se pueda recoger una extensa colección de problemas que se presentan en Programación Lineal. La mayoría de los modelos que se encuentran escritos en el presente texto y el planteamiento de los mismos corresponden a la experiencia desarrollada a lo largo del tiemp...

  17. Recent Advances in Marine Algae Polysaccharides: Isolation, Structure, and Activities.

    Science.gov (United States)

    Xu, Shu-Ying; Huang, Xuesong; Cheong, Kit-Leong

    2017-12-13

    Marine algae have attracted a great deal of interest as excellent sources of nutrients. Polysaccharides are the main components in marine algae, hence a great deal of attention has been directed at isolation and characterization of marine algae polysaccharides because of their numerous health benefits. In this review, extraction and purification approaches and chemico-physical properties of marine algae polysaccharides (MAPs) are summarized. The biological activities, which include immunomodulatory, antitumor, antiviral, antioxidant, and hypolipidemic, are also discussed. Additionally, structure-function relationships are analyzed and summarized. MAPs' biological activities are closely correlated with their monosaccharide composition, molecular weights, linkage types, and chain conformation. In order to promote further exploitation and utilization of polysaccharides from marine algae for functional food and pharmaceutical areas, high efficiency, and low-cost polysaccharide extraction and purification methods, quality control, structure-function activity relationships, and specific mechanisms of MAPs activation need to be extensively investigated.

  18. El cooperativismo de ayuda mutua en el Uruguay: una alternativa popular y autogestionaria de solución al problema de la vivienda

    Directory of Open Access Journals (Sweden)

    Nahoum, Benjamín

    1984-07-01

    Full Text Available This work attempts to describe the characteristics of the system of building houses by Mutual Assistance Cooperatives, which was introduced in Uruguay in 1968. Its advantages are analyzed with respect to other systems in countries with a capitalist economy, dependent in economic and urban aspects on adapting to the needs of those it is designed for and, in particular, with reference to the profound social and community meaning contained in these experiments. This aspect, which reaffirms values of solidarity deeply-rooted in the sectors of society organized into Cooperatives, subsequently leads the groups to also face colectively other social problems they come up against, which arise from the conditions of under-development and dependence pertaining to Latin American countries: in short, the substantive feature of this type of experience, more than its unquestionable validity, is rather the idea of housing cooperativism as a solution to the habitation problem.El presente trabajo procura describir las características del sistema de construcción de viviendas por Cooperativas de Ayuda Mutua, implantado en el Uruguay, en 1968. Se analizan sus ventajas respecto de otros sistemas en países de economía capitalista dependiente en aspectos económicos, urbanísticos, en la adaptación a las necesidades de los destinatarios y, sobre todo, en lo referente al profundo sentido social y comunitario que estas experiencias contienen. Este aspecto, que reafirma valores solidarios arraigados en los sectores populares organizados en las Cooperativas, conduce posteriormente a los grupos a encarar, también colectivamente, otros problemas sociales que ellos enfrentan, emergentes de las condiciones de subdesarrollo y dependencia de los países latinoamericanos; éste es, en definitiva, más allá de la indiscutible validez, el cooperativismo de vivienda como solución a la problemática habitacional, el rasgo sustantivo de este tipo de experiencias.

  19. Investigation about Role of Algae in Kazeroon Sasan Spring Odor

    Directory of Open Access Journals (Sweden)

    A Hamzeian

    2016-05-01

    Full Text Available Introduction: As odor for potable water is unpleasant for costumers, it needs to do researches for finding the reasons of odorous water. Sasan spring that is located in, near kazeroon city, Fars, Iran, is potable water resource for Kazeroon and Booshehr city and many other villages. Water in Sasan spring has the odor problem. With regards to important   role of algae on ado r problems in this study the role of algae on   odor was investigated. Methods: After regular sampling, the TON (threshold odor number was indicated and algae species was distinguished and the number of total algae and any species  of algae was numbers by microscopic direct numbering method .as the algae mass  is related to nitrogen and phosphor concentration, results of concentration Of nitrogen and phosphor in this spring that was examined regularity by water company was investigated and compared to concentration of these component that are need for algae growing.   Results: results shows that TON was in range  of 4.477 to 6.2 that indicated  oderous limit . Regression and diagram between TON and number of total algae showed the linear relationship. The concentration of nitrogen and phosphor, showed adequate condition for algal grow. Result of determination of algae species showed high population of Oscilatoria and Microcystis species, which are known as essential case of mold odor in water resources. Investigation on geological maps in the region around the Sasan spring, show alluvium source and is effected by surface part of it’s around land. Conclusion: because of the algae was determined as the essential cause of odor   in the spring, and algal growth is related to nutrients, and because of the surface pollution can penetrate in the alluvium lands around the spring, and effect the water in spring, so nutrient control and management is the essential way for odor control in the spring.

  20. Control Parental y Problemas Emocionales y de Conducta en Adolescentes

    Directory of Open Access Journals (Sweden)

    DIANA BETANCOURT OCAMPO

    2011-01-01

    Full Text Available El propósito de esta investigación es determinar si existen diferencias de acuerdo con el género de los padres en los efectos del control parental psicológico y conductual en los problemas emocionales y de conducta de los hijos hombres y mujeres. Se seleccionó una muestra no probabilística de 587 estudiantes de secundaria pública de Ciudad de México. El 46,8% fueron hombres y el 53,2%, mujeres, con una media de edad de 13,8 años. Se utilizó la Escala de Percepción de Control Paterno y Materno para Adolescentes y la versión ajustada del Youth Self-Report. Los resultados mostraron que, en general, el control psicológico tanto materno como paterno tuvo una mayor influencia que el control conductual en la presencia de problemas emocionales y de conducta.

  1. La comunicación corno quehacer y como problema

    Directory of Open Access Journals (Sweden)

    Javier Luis Mier

    2015-01-01

    Full Text Available Este número aborda la comunicación desde las tres interpretaciones más importantes: la tradicionalista, la militar y mercantilista y el arte popular tan inestable, cuestionado y cambiante. Canclini cuestiona la compartamentalización de cultura: popular y de medios y esboza los problemas que plantea la tradicional miopía de no reconocer la universalización y ubicuidad de la cultura de masas. Se agregan otros temas como: ¿Re-intelección de los medios? apuntes sobre un libro de los Mattelart, ¿"Ética" o "Deontología"?, El lenguaje del vestido y de la fiesta,Talleres de cultura Popular en Santiago de Chile, El dilema del arte popular en Bolivia,¿Sobrevivirán las artesanías aborígenes argentinas?, Los tejedores de El Tintorero, Tecnologías de computación y Tercer Mundo, La cobertura del terremoto en México, La comunicación como quehacer y como problema, la comunicación planificada sirve al desarrollo

  2. El desarrollo profesional del profesorado universitario: Circunstancias, problemas y propuestas

    Directory of Open Access Journals (Sweden)

    Vicente S. Ferreres Pavía

    2001-01-01

    Full Text Available La aprobación de la LOU ha sido el punto crítico y el fin de un proceso sobre el desarrollo profesional del docente universitario. Eso nos ha obligado a fijarnos en algunos elementos fundamentales entre ellos el I y II Plan de Evaluación de la Calidad de las Universidades y, específicamente, la evaluación de las Titulaciones. Con la revisión de estas y otras circunstancias y problemas y, previa la contextualización, académica y didáctica de la formación permanente, construimos una propuesta en la que, entremezclamos elementos administrativos con políticos e, indicadas algunas condiciones y principios, proponemos dos estrategias fundamentales: el estudio de caso y la solución de problemas. Viendo, claramente, el camino que toma la Universidad, el discurso comunicativo, moral y académico, de la formación docente, lo hemos abandonado, por el momento, por otro “profesionalizador”, entendiendo que es el más eficaz e, incluso en este momento, a nuestro entender, el único posible.

  3. Phycobiliproteins: A Novel Green Tool from Marine Origin Blue-Green Algae and Red Algae.

    Science.gov (United States)

    Chandra, Rashmi; Parra, Roberto; Iqbal, Hafiz M N

    2017-01-01

    Marine species are comprising about a half of the whole global biodiversity; the sea offers an enormous resource for novel bioactive compounds. Several of the marine origin species show multifunctional bioactivities and characteristics that are useful for a discovery and/or reinvention of biologically active compounds. For millennia, marine species that includes cyanobacteria (blue-green algae) and red algae have been targeted to explore their enormous potential candidature status along with a wider spectrum of novel applications in bio- and non-bio sectors of the modern world. Among them, cyanobacteria are photosynthetic prokaryotes, phylogenetically a primitive group of Gramnegative prokaryotes, ranging from Arctic to Antarctic regions, capable of carrying out photosynthesis and nitrogen fixation. In the recent decade, a great deal of research attention has been paid on the pronouncement of bio-functional proteins along with novel peptides, vitamins, fine chemicals, renewable fuel and bioactive compounds, e.g., phycobiliproteins from marine species, cyanobacteria and red algae. Interestingly, they are extensively commercialized for natural colorants in food and cosmetics, antimicrobial, antioxidant, anti-inflammatory, neuroprotective, hepatoprotective agents and fluorescent neo-glycoproteins as probes for single particle fluorescence imaging fluorescent applications in clinical and immunological analysis. However, a comprehensive knowledge and technological base for augmenting their commercial utilities are lacking. Therefore, this paper will provide an overview of the phycobiliproteins-based research literature from marine cyanobacteria and red algae. This review is also focused towards analyzing global and commercial activities with application oriented-based research. Towards the end, the information is also given on the potential biotechnological and biomedical applications of phycobiliproteins. Copyright© Bentham Science Publishers; For any queries, please

  4. Antileishmanial properties of tropical marine algae extracts.

    Science.gov (United States)

    Freile-Pelegrin, Y; Robledo, D; Chan-Bacab, M J; Ortega-Morales, B O

    2008-07-01

    Aqueous and organic extracts of twenty-seven species of marine algae (14 species of Rhodophyta, 5 species of Phaeophyta and 8 species of Chlorophyta) collected from the Gulf of Mexico and Caribbean coast of the Yucatan Peninsula (Mexico) were evaluated for their antileishmanial in vitro activity against Leishmania mexicana promastigote forms. The cytotoxicity of these extracts was also assessed using brine shrimp. Organic extracts from Laurencia microcladia (Rhodophyta), Dictyota caribaea, Turbinaria turbinata and Lobophora variegata (Phaeophyta) possessed promising in vitro activity against L. mexicana promastigotes (LC(50) values ranging from 10.9 to 49.9 microg/ml). No toxicity of algal extracts against Artemia salina was observed with LC50 ranging from 119 to >or=1000 microg/ml. Further studies on bio-guided fractionation, isolation and characterization of pure compounds from these species as well as in vivo experiments are needed and are already in progress.

  5. An algae-covered alligator rests warily

    Science.gov (United States)

    2000-01-01

    An algae-covered alligator keeps a wary eye open as it rests in one of the ponds at Kennedy Space Center. American alligators feed and rest in the water, and lay their eggs in dens they dig into the banks. The young alligators spend their first several weeks in these dens. The Center shares a boundary with the Merritt Island National Wildlife Refuge, which encompasses 92,000 acres that are a habitat for more than 331 species of birds, 31 mammals, 117 fishes, and 65 amphibians and reptiles. The marshes and open water of the refuge provide wintering areas for 23 species of migratory waterfowl, as well as a year-round home for great blue herons, great egrets, wood storks, cormorants, brown pelicans and other species of marsh and shore birds, as well as a variety of insects.

  6. Estatus adulto, consolidación de identidad, religiosidad y trascendencia como predictores del bienestar psicológico en la adultez emergente

    OpenAIRE

    Torres Jiménez, Francisca

    2016-01-01

    El fundamento de esta tesis se encuentra en una inclinación connatural por los temas relacionados con la madurez personal y las tareas de madurez en la etapa adulta, desde la perspectiva de la Teoría del Ciclo Vital del desarrollo humano. Se profundiza en el estudio de la transición de la adolescencia a la edad adulta y en el conepto de adultez emergente propuesto por Jeffrey Jensen Arnett. Se trata de una etapa del ciclo en la que el individuo puede encontrar un espacio privilegiado donde av...

  7. Ocorrência de compostos de interesse emergente no aquífero Dunas-Barreiras e nos esgotos de Natal/RN

    OpenAIRE

    Silva, Francisco Francimar da Fonseca

    2015-01-01

    A detecção de microcontaminantes de interesse emergente em amostras ambientais de águas superficiais, águas subterrâneas, água potável, águas residuárias e efluentes de estações de tratamento de água e esgoto (ETAs e ETEs), em vários países, indica que esses poluentes encontram-se disseminados pelo meio ambiente, principalmente em regiões urbanizadas. Isto é motivo de grande preocupação, pois muitos desses compostos são potencialmente prejudiciais aos seres humanos e a outro...

  8. Determinação de contaminantes emergentes em mananciais de água bruta e na água para consumo humano do Distrito Federal

    OpenAIRE

    Santana, Joyce da Silva

    2013-01-01

    Contaminantes emergentes referem-se às substâncias químicas cujo interesse por estudos associados à ocorrência e efeitos no ambiente é recente. Ainda há uma escassez de dados relacionados à ocorrência destes contaminantes no Brasil, o que motivou a realização do presente trabalho. Foram selecionadas amostras de águas superficiais do Lago Paranoá e de dois mananciais de água do Distrito Federal (DF): Rio Descoberto e Córrego Cabeça de Veado. Também foram analisadas ...

  9. Flujos de capital y política fiscal en las economías emergentes de América Latina

    OpenAIRE

    Ignacio Lozano; Ligia Alba Melo B.; Jorge Enrique Ramos F.

    2012-01-01

    En este documento se evalúa la respuesta de la política fiscal ante los choques de los flujos de capital registrados durante las dos últimas décadas en seis economías emergentes de América Latina: Argentina, Brasil, Chile, Colombia, México y Perú. Con base en la caracterización de los diferentes episodios de entradas y salidas súbitas de capital y en los resultados de un modelo de datos de panel con variables instrumentales, se concluye que no hubo respuestas directas de las autoridades fisca...

  10. Iconografías emergentes y muertes patrimonializadas en América Latina: Santa Muerte, muertos milagrosos y muertos adoptados

    OpenAIRE

    Juan Antonio Flores Martos

    2014-01-01

    Exploro etnográficamente unos imaginarios en sociedades latinoamericanas donde la muerte tiene un protagonismo y agencia relevante y su conexión con unas figuras y cultos emergentes que pretenden encarnarla como un bien y patrimonio propio. A partir de la Santa Muerte en México, se establece un contraste comparativo con los procesos de patrimonialización cultural de la muerte en otras sociedades americanas: manufactura de muertos milagrosos –santos populares– en cementerios, y procesos de ele...

  11. Terapias logopédicas emergentes aplicadas a la parálisis cerebral infantil: Propuesta de intervención en la Educación Primaria

    OpenAIRE

    Morales Vaquero, Raquel

    2017-01-01

    El objetivo de este trabajo se centra en el diseño de un programa de intervención logopédica de desarrollo y mejora de los procesos comunicativos y lingüísticos, dirigido al alumnado de Educación Primaria con Parálisis Cerebral Infantil matriculado en un centro ordinario, basado en metodologías técnicas y procedimientos actuales y emergentes en el campo de la Logopedia, tales como las Técnicas de Tratamiento Global (Bobath), Técnicas Terapéuticas Funcionales (masticación, succión, deglución),...

  12. QR académico: una propuesta didáctica emergente con apropiación de la cultura juvenil

    OpenAIRE

    Flora Arteaga Bustos

    2016-01-01

    Presentar una propuesta didáctica emergente para el uso del celular dentro del aula mediante la utilización de códigos QR (quick response- respuesta rápida-) rige el objetivo del artículo. Se basa en la sistematización de teorías previas, identificadas en la búsqueda por difundir las nuevas estrategias educativas tecnológicas que se desarrollan en el ámbito venezolano. Su fundamentación se basa en la promoción de competencias digitales cónsonas a la cultura juvenil, la mejora de la calidad e...

  13. Pensamiento estratégico emergente en la construcción de la realidad sustentable, Sector Cacao; Estado Sucre, Venezuela

    OpenAIRE

    María Lourdes Bruzco Hurtado

    2015-01-01

    Se reflexiona sobre el pensamiento estratégico emergente en la construcción de la realidad sustentable en el sector cacao del estado Sucre, a partir de la racionalidad existente en el área y la que emerge al acercarse el sujeto indagador influenciado por el campo de las ciencias administrativas y gerenciales. La investigación se aborda desde la perspectiva interpretativa, haciendo uso del método hermenéutico. Se encontró: 1. Los informantes poseen conocimiento sobre los elementos constitutivo...

  14. Avaliação e tratamento dos contaminantes emergentes ( Ácido Acetilsalicílico, Diclofenaco e Paracetamol ) utilizando processos oxidativos avançados

    OpenAIRE

    Carla Napoleão, Daniella

    2011-01-01

    O interesse da comunidade científica no estudo de micropoluentes é muito recente e tem aumentado a cada dia, uma vez que estas substâncias vêm causando alterações importantes no meio ambiente, interferindo no sistema endócrino de animais e de seres humanos. Logo, foi necessário classificar essas substâncias que receberam o nome de contaminantes emergentes, dentre os quais estão os fármacos de diferentes classes como: analgésicos, antiinflamatórios, drogas psiquiátricas, antilip...

  15. Capital extranjero y crecimiento económico en mercados emergentes : ¿son la ayuda externa y la inversión extranjera directa sustitutos?

    OpenAIRE

    Chuquilín Mori, Micaela; Salinas Depaz, César

    2015-01-01

    Esta investigación estudia las relaciones de corto y largo plazo entre la ayuda externa y la inversión extranjera directa sobre el crecimiento económico en mercados emergentes. Aplicando la estimación de Pooled Mean Group (PMG) de Pesaran, Shin & Smith (1999) a una base de datos de panel desbalanceado para 94 países en el periodo 1960-2012, encontramos una relación de largo plazo positiva y significativa entre estos dos tipos de capital extranjero y el crecimiento económico. Adicionalmente, i...

  16. Polinização de Caryocar villosum (Aubl.) Pers. (Caryocaraceae) uma árvore emergente da Amazônia Central

    OpenAIRE

    Martins, Rodrigo Lemes; Gribel, Rogério

    2007-01-01

    Caryocar villosum é uma árvore emergente comum na Amazônia central. É uma espécie importante devido à qualidade da madeira e à produção de frutos para populações humanas e animais. No presente trabalho foram estudados a biologia floral, a polinização e o sistema reprodutivo de C. villosum. Foram observadas árvores em ambiente urbano, fragmentos de mata e mata contínua, com atenção em aspectos da interação polinizador-planta e características das flores. Foram realizadas polinizações controlad...

  17. LA FORMACIÓN DE ESTRATEGIAS DELIBERADAS Y EMERGENTES: UNA PROPUESTA A PARTIR DE DEFINICIONES BÁSICAS DE UNA METODOLOGÍA DE SISTEMAS SUAVES

    OpenAIRE

    IVÁN ALONSO MONTOYA RESTREPO; LUZ ALEXANDRA MONTOYA RESTREPO

    2013-01-01

    La propuesta teórica que se presenta, se relaciona con la formación de la estrategia desde una pers - pectiva evolutiva y con conexiones entre estrategias deliberadas y emergentes, gracias al empleo de definiciones básicas o raíces, empleando la metodología de sistemas suaves SSM propuesta por Checkland & Scholes (1994). Para ello se propone la interacción de entes “autónomos” y semió - ticos (agentes, organizaciones y entorno) en los sistemas real y representacional de interacciones. Estas n...

  18. Contribuição para o estudo da presença e remoção de compostos emergentes de filtros de UV em ETAR

    OpenAIRE

    Simões, Pedro Miguel da Silva Vieira

    2010-01-01

    Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do Grau de Mestre em Engenharia do Ambiente – Perfil Engenharia Sanitária Grande parte das substâncias produzidas pelas actividades humanas acabam por chegar às estações de tratamento de águas residuais (ETAR). Os compostos constituintes dos filtros de UV, considerados micropoluentes emergentes, são utilizados em diversas aplicações, sobretudo: produtos de higiene pessoal (PHP), pneus...

  19. Costo de servir como variable de decisión estratégica en el diseño de estrategias de atención a canales de mercados emergentes

    Directory of Open Access Journals (Sweden)

    Christopher Mejía Argueta

    2015-01-01

    Full Text Available Este artículo tiene como objetivo documentar diferentes enfoques tradicionales sobre el análisis de costos para mercados emergentes a fin de hallar brechas y áreas de oportunidad relacionadas con la temática del costo de servir. El artículo encuentra que no existe una metodología adaptada para mercados emergentes que permita analizar detalladamente la rentabilidad en canales, clientes y productos para crear estrategias de atención acordes con las necesidades que estos grupos expresan. Al final de la revisión y contraste de metodologías, se explica una tabla con los procedimientos analizados y las áreas de oportunidad más importantes que servirán de base para la creación de una metodología de costo de servir para mercados emergentes.

  20. Harmful impact of filamentous algae (Spirogyra sp. on juvenile crayfish

    Directory of Open Access Journals (Sweden)

    Ulikowski Dariusz

    2015-12-01

    Full Text Available The aim of this study was to determine the impact of filamentous algae on the growth and survival of juvenile narrow-clawed crayfish, Astacus leptodactylus (Esch., in rearing basins. Three stocking variants were used: A - basins with a layer of filamentous algae without imitation mineral substrate; B - basins with a layer of filamentous algae with imitation mineral substrate; C - basins without filamentous algae but with mineral substrate. The crayfish were reared from June 12 to October 10 under natural thermal conditions and fed a commercial feed. The results indicated that the presence of the filamentous algae did not have a statistically significant impact on the growth of the juvenile crayfish (P > 0.05. The presence of the filamentous algae had a strong negative impact on juvenile crayfish survival and stock biomass (P < 0.05. The layer of gravel and small stones that imitated the mineral substrate of natural aquatic basins somewhat neutralized the disadvantageous impact the filamentous algae had on the crayfish.

  1. A screening method for cardiovascular active compounds in marine algae.

    Science.gov (United States)

    Agatonovic-Kustrin, S; Kustrin, E; Angove, M J; Morton, D W

    2018-05-18

    The interaction of bioactive compounds from ethanolic extracts of selected marine algae samples, separated on chromatographic plates, with nitric/nitrous acid was investigated. The nature of bioactive compounds in the marine algae extracts was characterised using UV absorption spectra before and after reaction with diluted nitric acid, and from the characteristic colour reaction after derivatization with anisaldehyde. It was found that diterpenes from Dictyota dichotoma, an edible brown algae, and sterols from green algae Caulerpa brachypus, bind nitric oxide and may act as a nitric oxide carrier. Although the carotenoid fucoxanthin, found in all brown marine algae also binds nitric oxide, the bonds between nitrogen and the fucoxanthin molecule are much stronger. Further studies are required to evaluate the effects of diterpenes from Dictyota dichotoma and sterols from green algae Caulerpa brachypus to see if they have beneficial cardiovascular effects. The method reported here should prove useful in screening large numbers of algae species for compounds with cardiovascular activity. Copyright © 2018 Elsevier B.V. All rights reserved.

  2. Helicobacter pylori y dispepsia, un problema de salud comunitario

    Directory of Open Access Journals (Sweden)

    Miguel González-Carbajal Pascual

    2002-06-01

    Full Text Available Mientras la relación causal entre el Helicobacter pylori y la gastritis crónica, así como la importante conexión entre esta infección, la úlcera gastroduodenal y el cáncer gástrico han sido bien establecidas, la asociación entre la infección por Helicobacter pylori y la dispepsia "no ulcerosa" es un problema que dista mucho de estar esclarecido. Hay autores que no dudan en utilizar tratamiento de erradicación en la dispepsia "no ulcerosa" con Helicobacter pylori, pero existen enfoques alternativos a este problema. La realización de tratamiento de erradicación en los pacientes con dispepsia "no ulcerosa" pudiera beneficiar o no a los enfermos y a la comunidad, pero seguramente no puede dejar de beneficiar a las transnacionales productoras de medicamentos que cosechan cuantiosas ganancias con la comercialización de los bloqueadores de la bomba de protones y los antibióticos que se incluyen en cualquier esquema de terapia erradicadora de la infección por Helicobacter pylori. El alivio de los síntomas dispépticos como consecuencia del tratamiento de erradicación del Helicobacter pylori no ha sido comprobado. El problema de realizar tratamiento de erradicación de la infección a los pacientes con dispepsia "no ulcerosa" continúa siendo un dilema y, por tanto, no debe indicarse sistemáticamente.Although the causative relationship between Helicobacter pylori and chronic gastritis as well as the important connection of this infection with gastric-duodenal ulcer and gastric cancer are well established, the association of Helicobacter pylori infection and non-ulcer dispepsia is a problem that is still unclear. Some authors do not hesitate in using Helicobacter pylori eradication treatment in cases of non-ulcer dispepsia but there are other alternative approaches to this problem. The eradication treatment in patients with non-ulcer dispepsia may or may not benefit patients and the community, but will benefit for sure the big drug

  3. Photophysiology and cellular composition of sea ice algae

    International Nuclear Information System (INIS)

    Lizotte, M.P.

    1989-01-01

    The productivity of sea ice algae depends on their physiological capabilities and the environmental conditions within various microhabitats. Pack ice is the dominant form of sea ice, but the photosynthetic activity of associated algae has rarely been studied. Biomass and photosynthetic rates of ice algae of the Weddell-Scotia Sea were investigated during autumn and winter, the period when ice cover grows from its minimum to maximum. Biomass-specific photosynthetic rates typically ranged from 0.3 to 3.0 μg C · μg chl -1 · h -1 higher than land-fast ice algae but similar to Antarctic phytoplankton. Primary production in the pack ice during winter may be minor compared to annual phytoplankton production, but could represent a vital seasonal contribution to the Antarctic ecosystem. Nutrient supply may limit the productivity of ice algae. In McMurdo Sound, congelation ice algae appeared to be more nutrient deficient than underlying platelet ice algae based on: lower nitrogen:carbon, chlorophyll:carbon, and protein:carbohydrate; and 14 C-photosynthate distribution to proteins and phospholipids was lower, while distribution to polysaccharides and neutral lipids was higher. Depletion of nitrate led to decreased nitrogen:carbon, chlorophyll:carbon, protein:carbohydrate, and 14 C-photosynthate to proteins. Studied were conducted during the spring bloom; therefore, nutrient limitation may only apply to dense ice algal communities. Growth limiting conditions may be alleviated when algae are released into seawater during the seasonal recession of the ice cover. To continue growth, algae must adapt to the variable light field encountered in a mixed water column. Photoadaptation was studied in surface ice communities and in bottom ice communities

  4. Problemas relacionados con el alcohol: perfil del varón de riesgo.

    OpenAIRE

    AM Gutiérrez Pérez; JF Díez Manrique; C Peña Martín; E García Usieto

    1994-01-01

    Estudio de población general realizado mediante una encuesta transversal sobre un universo de 1.365 varones. Su objetivo es dibujar un perfil personal de alto riesgo de padecer problemas relacionados con el alcohol. Un 9% de los entrevistados refiere haber sufrido al menos tres problemas relacionados con el alcohol en el año anterior al estudio. Los consumidores habituales excesivos presentan mayor probabilidad de sufrir tres problemas relacionados con el alcohol. Se confirma la figura del jo...

  5. Uptake of technetium by marine algae: autoradiographic localization

    Energy Technology Data Exchange (ETDEWEB)

    Bonotto, S.; Nuyts, G.; Robbrecht, V.; Cogneau, M.; Ben, D. van der

    1988-02-01

    The uptake of technetium (sup(95m)Tc) by marine algae was localized by autoradiography. In the brown (Ascophyllum nodosum, Fucus spiralis and F. vesiculosus) as well as in the red (Porphyra umbilicalis) species, the distribution of technetium was heterogeneous, this radioelement being mostly accumulated in the parts of the plant which bear reproductive cells or which contain young tissues. Since brown algae have high concentration factors, they could constitute an important link in the transfer of technetium through the food chain. On the contrary, the edible alga Porphyra umbilicalis shows a very low incorporation of technetium.

  6. Dinitrogen fixation by blue-green algae from paddy fields

    International Nuclear Information System (INIS)

    Thomas, Joseph

    1977-01-01

    Recent work using radioactive nitrogen on the blue-green algae of paddy fields has been reviewed. These algae fix dinitrogen and photoassimilate carbon evolving oxygen, thereby augmenting nitrogen and carbon status of the soil and also providing oxygen to the water-logged rice paddies. Further studies using radioactive isotopes 13 N, 24 Na and 22 Na on their nitrogen fixation, nitrogen assimilation pathways; regulation of nitrogenase, heterocysts production and sporulation and sodium transport and metabolism have been carried out and reported. The field application of blue green algae for N 2 fixation was found to increase the status of soil nitrogen and yield of paddy. (M.G.B.)

  7. Photobiological hydrogen production with switchable photosystem-II designer algae

    Science.gov (United States)

    Lee, James Weifu

    2014-02-18

    A process for enhanced photobiological H.sub.2 production using transgenic alga. The process includes inducing exogenous genes in a transgenic alga by manipulating selected environmental factors. In one embodiment inducing production of an exogenous gene uncouples H.sub.2 production from existing mechanisms that would downregulate H.sub.2 production in the absence of the exogenous gene. In other embodiments inducing an exogenous gene triggers a cascade of metabolic changes that increase H.sub.2 production. In some embodiments the transgenic alga are rendered non-regenerative by inducing exogenous transgenes for proton channel polypeptides that are targeted to specific algal membranes.

  8. The biotechnological ways of blue-green algae complex processing

    OpenAIRE

    Nykyforov, Volodymyr; Malovanyy, Myroslav; Kozlovskaya, Tatyana; Novokhatko, Olha; Digtiar, Sergii

    2016-01-01

    The results of long­term research of various ways and methods of collection and processing of blue­green algae that cause “bloom” of the Dnieper reservoirs were presented. The possibility and feasibility of the blue­green algae biomass processing to biogas by methanogenesis were substantiated. It was found experimentally that preliminary mechanical cavitation of the blue­green algae biomass increases the biogas yield by 21.5 %. It was determined that the biogas produced contains up to 72 % of...

  9. Detection of green algae (Chlorophyceae) for the diagnosis of drowning.

    Science.gov (United States)

    Yoshimura, S; Yoshida, M; Okii, Y; Tokiyasu, T; Watabiki, T; Akane, A

    1995-01-01

    The plankton test (generally, diatom test) is one of the methods available to diagnose the cause of death of submerged bodies. The solubilization method using tissue solubilizer Soluene-350 was used in this study to detect not only diatoms but also green algae, based on the fact that the solubilizer does not digest the cell walls of green algae which are made from cellulose. Detection of green algae from organs of submerged cadavers is very informative to determine drowning in fresh water, and also in cases where only few diatoms are detected in the organs.

  10. Validez del Youth Self Report para problemas de conducta en niños mexicanos

    Directory of Open Access Journals (Sweden)

    Ma. del Rocío Valencia García

    2005-01-01

    Full Text Available En los últimos años se ha observado un incremento en la demanda de atención por problemas de conducta y/o trastornos de conducta de los niños en diferentes instituciones públicas de México, D.F. Debido a la falta de instrumentos de valuación adecuados a nuestro medio y cultura mexicanos, se realizó un estudio ex post facto para validar el Youth Self Report (YSR de Achenbach y Rescorla en población mexicana, y así poder detectar oportunamente los problemas de conducta internalizada y externalizada que presentan los niños(as. Participaron 671 niños (media de edad de 11, 10 años estudiantes de 5° y 6° año de primarias públicas del Distrito Federal. En términos generales, los resultados mostraron que los factores de ambas versiones se mantienen; sin embargo, existen algunas diferencias. En la versión mexicana se obtuvieron 6 factores, uno para problemas externalizados y 5 para problemas internalizados, en contraste con la versión original del YSR la cual consta de cinco escalas, tres subescalas para los problemas internalizados, otra de problemas sociales, otra de problemas de pensamiento, otra de problemas de atención y dos subescalas para problemas externalizados. Dichos hallazgos son discutidos.

  11. Los problemas del aprendizaje en la escuela. Perspectiva social

    Directory of Open Access Journals (Sweden)

    Sindo FROUFE QUINTAS

    2009-11-01

    Full Text Available Pocos temas han tenido tanta importancia y repercusión en la escuela como el problema de los trastornos de aprendizaje desde una perspectiva social/sociológica. Distintos tipos de profesionales como psicólogos, neurólogos, ópticos, fisioterapeutas, pedíatras, pedagogos y maestros han manifestado/mostrado un gran interés por conocer/descifrar en profundidad su etiología. Quedan aún muchas lagunas/misterios por aclarar. La mente humana es duramente compleja. La cultura es un bien que todo el mundo desea conquistar. Por ella se entra en el mundo de la civilización tecnológica y en la interpretación correcta de los distintos sistemas de comunicación que abren nuevos horizontes al hombre de la técnica.

  12. INTERVENCIÓN INTERACTIVA EN LOS PROBLEMAS DE COMPORTAMIENTO INFANTIL

    OpenAIRE

    Ariel Vite Sierra

    2015-01-01

    El objetivo del estudio fue examinar la efectividad de una estrategia de intervención con padres, basada en la perspectiva de la interacción social, a fin de disminuir los problemas de comportamiento infantil. Los participantes fueron 15 niños (11 niños y 4 niñas) con sus respectivas madres; las edades de los niños oscilaron entre los cinco y los ocho años, y el promedio de edad de las madres fue de 27.8 años. Se empleó un diseño experimental de caso único y se utilizaron procedimientos de en...

  13. Problemas éticos al final de la vida

    Directory of Open Access Journals (Sweden)

    Maria Graciela De Ortuzar

    2014-06-01

    Full Text Available El presente informe trata sobre el análisis filosófico de un tema complejo y controvertido, como lo es la ?definición de muerte?. Por ello, es importante subrayar que no desarrollaré aquí los aspectos antropológicos, sicológicos, médicos y técnicos de la muerte. Sólo me centraré en las teorías filosóficas principales que justifican diferentes definiciones de muerte (esencialista vs. biológica y sus consecuentes problemas prácticos. La necesidad de realizar esta investigación surge a partir del reconocimiento de confusiones conceptuales y contradicciones cuando se comunica ?la muerte? (falta de concordancia entre la definición filosófica, criterios y tests; contradicciones reflejadas cotidianamente en el lenguaje y en las actitudes del personal médico y de enfermería de nuestras Unidades de Terapia Intensiva (UTIs. Hablar de paciente al referirse a un cadáver al que se le ha diagnosticado la muerte encefálica; hablar de muerte cuando se produce el paro cardiorespitariaco (¿dos muertes?; hablar de eutanasia cuando se retira el respirador al individuo muerto cuyos órganos están siendo mantenidos artificialmente; éstas situaciones -entre otras- reflejan conflictos y falta de claridad conceptual sobre los conceptos básicos de muerte y eutanasia. Dichos conflictos constituyen problemas éticos claves al final de la vida, los cuáles nacen a partir del reciente cambio en el criterio de muerte en un contexto de acelerada ?tecnologización? de la salud. He aquí la necesidad del análisis crítico sobre el marco teórico-conceptual requerido en UTIs y su confrontación aplicada, con el fin de esclarecer los citados problemas. Para ello, estudiaré la teoría moral unificada de Bernard Gert, examinando su justificación teórica y su aplicabilidad práctica, como así también las posiciones alternativas a la misma (Wikler. En términos generales, considero que la defensa de la coherencia, sistematicidad y aplicabilidad de las

  14. La innovación en Uruguay. Problemas, instituciones, perspectivas

    Directory of Open Access Journals (Sweden)

    Judith Sutz

    1995-12-01

    Full Text Available En este trabajo se aborda la innovación en Uruguay desde dos puntos de vista: por una parte, se plantea la innovación como problema; por otra, se analiza el tejido institucional en el cual se desarrollan los procesos innovativos. La necesidad de esfuerzos en el marco del desarrollo científico-tecnológico mundial, la especificidad de un país pequeño, la inadecuación de las formas canónicas de la evaluación académica, el desconocimiento de los actores productivos acerca de la oferta local de soluciones, y la innovación como cuestión de Estado, constituyen el primer abordaje. El segundo presenta un mapa sintético de las diversas instituciones -incluyendo empresas- involucradas en procesos de innovación, señalando sus logros y limitaciones.

  15. La violencia familiar, ¿un problema de salud?

    Directory of Open Access Journals (Sweden)

    Mario C. Muñiz Ferrer

    Full Text Available Con el objetivo de profundizar en el estudio de la violencia intrafamiliar y para su mejor conocimiento y enfrentamiento en el área de salud, se realiza un estudio descriptivo de los resultados obtenidos al aplicar el test proyectivo "Lo que no me gusta en mi familia" y una entrevista a 147 niños de 5to. y 6to. grados de la Escuela "Roberto Poland" del Reparto "Antonio Maceo", del municipio Cerro; donde se clasifican las variedades de violencia intrafamiliar y se agrupan éstas por orden de frecuencia. También se calcula la prevalencia de violencia intrafamiliar y se explora la posible relación de la violencia con la ingestión de bebidas alcohólicas. Los resultados obtenidos permiten plantear que la violencia intrafamiliar constituye un problema de salud y que existe relación entre ésta y el consumo de alcohol

  16. Ação preventiva em problemas visuais de escolares

    OpenAIRE

    Temporini,Edméa Rita

    1984-01-01

    Apresenta-se abordagem preventiva de problemas visuais de escolares, considerando os níveis de prevenção em Saúde Pública (Leavell e Clark). É destacada a importância da atuação em educação para a saúde na escola, dirigida à promoção da saúde ocular e à prevenção de distúrbios oftalmológicos, buscando a adoção de condutas acertadas do indivíduo, em termos pessoais e coletivos. A linha geral da programação é descrita sucintamente, concluindo pela necessidade da manutenção dos seus propósitos e...

  17. O problema da natureza humana em Jacques Maritain

    Directory of Open Access Journals (Sweden)

    Névio de Campos

    2013-05-01

    Full Text Available Este artigo tem por objetivo discutir o problema da natureza humana em Jacques Maritain, destacando sua crítica ao humanismo antropocêntrico e a concepção do humanismo integral. Apoia-se na obra Humanismo Integral e nos debates da História Intelectual para problematizar a origem de seus escritos (contexto de produção e a acepção de humanismo teocêntrico (História da Filosofia proposta por esse filósofo tomista. Esta discussão permite-nos afirmar que o humanismo antropocêntrico é acusado por Maritain de conformar, nos tempos modernos, a própria tragédia do homem, da cultura e de Deus, assim como sustentar que o humanismo integral foi postulado como filosofia reintegradora da unidade ocidental, cindida pela filosofia naturalista (Renascimento/Reforma/Iluminismo/Comunismo.

  18. DNA barcoding of a new record of epi-endophytic green algae ...

    Indian Academy of Sciences (India)

    Epi-endophytic green algae comprise one of the most diverse and phylogenetically primitive groups of green algae and are considered to be ubiquitous in the world's oceans; however, no reports of these algae exist from India. Here we report the serendipitous discovery of Ulvella growing on intertidal green algae ...

  19. Sexualidad en la mujer con enfermedad cardiovascular: un problema oculto

    Directory of Open Access Journals (Sweden)

    Diana Achury

    2011-12-01

    Full Text Available Introducción: Las enfermedades cardiovasculares producen alteraciones en la vida sexual de los individuos que las padecen, sin embargo en la práctica clínica y la mayoría de investigaciones han reconocido las disfunciones sexuales masculinas como un problema prioritario, dejando a un lado las disfunciones de la mujer. Siendo necesario que el profesional de enfermería reconozca la sexualidad de la mujer como un elemento fundamental en la calidad de vida, comprendiendo el significado de la sexualidad, los factores que influyen en la exploración de sexualidad, la realidad de la disfunciones sexuales femeninas y las estrategias de cuidado para poder brindar una orientación adecuada que permita la continuación de la vida sexual satisfactoria. Materiales y Métodos:Revisión de literatura. Discusión y Conclusiones: La expresión de la sexualidad femenina es multidimensional y altamente contextual, y se ve influida por una amplia gama de factores socioculturales, cognitivos, afectivos, de relación, intrapsíquicos, etc; todos ellos deben tenerse en cuenta para la comprensión de sus problemas, desde una perspectiva integral; Se requiere de investigación para determinar la prevalencia, impacto, significado de la disfunción sexual en la mujer con enfermedad cardiovascular en Colombia. (Rev Cuid 2011; 2(2: 225-29.Palabras clave: Sexualidad, Mujer, Enfermedad Cardiovascular. (Fuente: DeCS BIREME.

  20. El problema de la salud en los Estados Unidos

    Directory of Open Access Journals (Sweden)

    Elsie L. Montiel Ziegler

    1990-05-01

    Full Text Available El alto costo de la atención a la salud es uno de los principales problemas internos que ha enfrentado la sociedad norteamericana en los últimos meses. Existe un acuerdo general acerca de la necesidad de reducir los costos sin afectar el derecho de todos los norteamericanos a la atención de sus necesidades de salud.La crisis que afecta al sistema de salud de los Estados Unidos involucra varios aspectos: los costos han ido creciendo rápidamente, de manera que la nación gasta más del 12% de su producto interno bruto en salud (más que cualquier otra nación industrializada; hay un número cada vez más grande de ciudadanos que carecen de seguro de salud; casi todos los estados de la unión americana se quejan de déficits presupuestales causados por su participación en los programas federales MEDICAID y MEDICARE, que atienden las necesidades de atención médica de los pobres y los ancianos. Ante los urgentes llamados a una reestructuración del sistema varias propuestas han sido elaboradas. Sin embargo, todavía no se logra un consenso acerca de cómo reestructurar el sistemaEste artículo analiza los principales problemas que ocupan el debate sobre la salud, así corno sus principales consecuencias, menciona algunas de las distintas propuestas de solución, y por último, hace un comentario acerca de la factibilidad y de los obstáculos que enfrentaría una refonna global al sistema de salud.

  1. Sterol composition of the Adriatic Sea algae Ulva lactuca, Codium dichotomum, Cystoseira adriatica and Fucus virsoides

    Directory of Open Access Journals (Sweden)

    RADOMIR KAPETANOVIC

    2005-12-01

    Full Text Available The sterol composition of two green algae and two brown algae from the South Adriatic was determined. In the green alga Ulva lactuca, the principal sterols were cholesterol and isofucosterol. In the brown alga Cystoseira adriatica, the main sterols were cholesterol and stigmast-5-en-3ß-ol, while the characteristic sterol of the brown algae, fucosterol, was found only in low concentration. The sterol fractions of the green alga Codium dichotomum and the brown alga Fucus virsoides contained practically only one sterol each, comprising more than 90 % of the total sterols (clerosterol in the former and fucosterol in the latter.

  2. TEORIAS DE INTERNACIONALIZAÇÃO E APLICAÇÃO EM PAÍSES EMERGENTES: UMA ANÁLISE CRÍTICA

    Directory of Open Access Journals (Sweden)

    WALTER F. ARAUJO DE MORAES

    2006-01-01

    Full Text Available Neste artigo são apresentadas e discutidas sete teorias de internacionalização, a saber: oModelo do Ciclo de Vida do Produto, Uppsala – Escola Nórdica de Negócios Internacionais,Relacionado à Inovação, Escolha Adaptativa, Paradigma Eclético de Internalização (OLI,Modelo de Internacionalização Baseado em Recursos (RBV e o Modelo Diamante. Oobjetivo é analisar criticamente estas teorias, propondo uma união entre alguns de seusconceitos-chave para um melhor entendimento do processo de internacionalização incluindo acontexto dos países emergentes. Ademais, questiona-se a aplicação destes modelos, elaboradosem países desenvolvidos, em países emergentes sem uma análise crítica, buscando-se aconvergência sem a percepção dos diferentes contextos e timing de internacionalização, já queo protecionismo instaurado tornou tardia a entrada destes países no mercado internacional.

  3. Tecnologías y modelos de aprendizaje emergentes en educación superior. Propuestas y difusión de innovaciones

    Directory of Open Access Journals (Sweden)

    Natália FERNANDES GOMES

    2015-01-01

    Full Text Available El avance de la tecnología, la existencia de nuevos tipos de redes colaborativas y la conectividad global permiten y requieren urgentemente que las instituciones de Educación Superior desarrollen nuevos, innovadores y creativos modelos de enseñanza y aprendizaje. En este trabajo se presentan, primero, algunos de los actuales modelos emergentes de aprendizaje para la Educación Superior, mediados a través del uso de las tecnologías, de acuerdo a diferentes informes internacionales. En la segunda parte se presentan los resultados de un estudio de revisión sistemática que nos permite comprender el grado de difusión de la innovación educativa que subyace a los diferentes modelos de aprendizaje (flipped learning, personal learning environments, mobile learning, massive open online courses. Los resultados indican que el modelo mobile learning es el más productivo con una tendencia en aumento. Finalmente se exponen conclusiones respecto a la importancia de la difusión de innovación y los obstáculos en la traducción de los modelos emergentes a los contextos de aula.

  4. Iconografías emergentes y muertes patrimonializadas en América Latina: Santa Muerte, muertos milagrosos y muertos adoptados

    Directory of Open Access Journals (Sweden)

    Juan Antonio Flores Martos

    2014-05-01

    Full Text Available Exploro etnográficamente unos imaginarios en sociedades latinoamericanas donde la muerte tiene un protagonismo y agencia relevante y su conexión con unas figuras y cultos emergentes que pretenden encarnarla como un bien y patrimonio propio. A partir de la Santa Muerte en México, se establece un contraste comparativo con los procesos de patrimonialización cultural de la muerte en otras sociedades americanas: manufactura de muertos milagrosos –santos populares– en cementerios, y procesos de elección y de «adopción» de muertos anónimos víctimas de la violencia en Colombia –los llamados muertos NN–. Estos cultos emergentes se conectan con la experiencia de sus practicantes de tomar el control de sus vidas en un precario estado de vulnerabilidad social, desamparados de instituciones estatales y estructuras oficiales. Unos «muertos vivientes» que disfrutan de buena salud.

  5. Bicarbonate produced from carbon capture for algae culture.

    Science.gov (United States)

    Chi, Zhanyou; O'Fallon, James V; Chen, Shulin

    2011-11-01

    Using captured CO(2) to grow microalgae is limited by the high cost of CO(2) capture and transportation, as well as significant CO(2) loss during algae culture. Moreover, algae grow poorly at night, but CO(2) cannot be temporarily stored until sunrise. To address these challenges, we discuss a process where CO(2) is captured as bicarbonate and used as feedstock for algae culture, and the carbonate regenerated by the culture process is used as an absorbent to capture more CO(2). This process would significantly reduce carbon capture costs because it does not require additional energy for carbonate regeneration. Furthermore, not only would transport of the aqueous bicarbonate solution cost less than for that of compressed CO(2), but using bicarbonate would also provide a superior alternative for CO(2) delivery to an algae culture system. Copyright © 2011 Elsevier Ltd. All rights reserved.

  6. Extreme Low Light Requirement for Algae Growth Underneath Sea Ice

    DEFF Research Database (Denmark)

    Hancke, Kasper; Lund-Hansen, Lars C.; Lamare, Maxim L.

    2018-01-01

    Microalgae colonizing the underside of sea ice in spring are a key component of the Arctic foodweb as they drive early primary production and transport of carbon from the atmosphere to the ocean interior. Onset of the spring bloom of ice algae is typically limited by the availability of light......, and the current consensus is that a few tens-of-centimeters of snow is enough to prevent sufficient solar radiation to reach underneath the sea ice. We challenge this consensus, and investigated the onset and the light requirement of an ice algae spring bloom, and the importance of snow optical properties...... for light penetration. Colonization by ice algae began in May under >1 m of first-year sea ice with approximate to 1 m thick snow cover on top, in NE Greenland. The initial growth of ice algae began at extremely low irradiance (...

  7. Kalaärimeeste kohus algas venitamisega / Hindrek Riikoja

    Index Scriptorium Estoniae

    Riikoja, Hindrek

    2007-01-01

    Harju maakohtus algas kohtuprotsess veterinaar- ja toiduameti endise asejuhi Vladimir Razumovski väidetava altkäemaksuvõtmise üle, kus on süüdistavaid eraisikuid ja ettevõtjaid. Lisa: Kes on kohtu all?

  8. Ectocarpus: a model organism for the brown algae.

    Science.gov (United States)

    Coelho, Susana M; Scornet, Delphine; Rousvoal, Sylvie; Peters, Nick T; Dartevelle, Laurence; Peters, Akira F; Cock, J Mark

    2012-02-01

    The brown algae are an interesting group of organisms from several points of view. They are the dominant organisms in many coastal ecosystems, where they often form large, underwater forests. They also have an unusual evolutionary history, being members of the stramenopiles, which are very distantly related to well-studied animal and green plant models. As a consequence of this history, brown algae have evolved many novel features, for example in terms of their cell biology and metabolic pathways. They are also one of only a small number of eukaryotic groups to have independently evolved complex multicellularity. Despite these interesting features, the brown algae have remained a relatively poorly studied group. This situation has started to change over the last few years, however, with the emergence of the filamentous brown alga Ectocarpus as a model system that is amenable to the genomic and genetic approaches that have proved to be so powerful in more classical model organisms such as Drosophila and Arabidopsis.

  9. Potential pharmacological applications of polyphenolic derivatives from marine brown algae.

    Science.gov (United States)

    Thomas, Noel Vinay; Kim, Se-Kwon

    2011-11-01

    Recently, the isolation and characterization of the biologically active components from seaweeds have gained much attention from various research groups across the world. The marine algae have been studied for biologically active components and phlorotannins are one among them. Among marine algae, brown algal species such as Ecklonia cava, Eisenia arborea, Ecklonia stolinifera and Eisenia bicyclis have been studied for their potential biological activities. Majority of the investigations on phlorotannins derived from brown algae have exhibited their potentiality as antioxidant, anti-inflammatory, antidiabetic, antitumor, antihypertensive, anti-allergic, hyaluronidase enzyme inhibition and in matrix metalloproteinases (MMPs) inhibition activity. In this review, we have made an attempt to discuss the potential biological activities of phlorotannins from marine brown algae and their possible candidature in the pharmaceutical applications. Copyright © 2011 Elsevier B.V. All rights reserved.

  10. Exploring the potential of using algae in cosmetics.

    Science.gov (United States)

    Wang, Hui-Min David; Chen, Ching-Chun; Huynh, Pauline; Chang, Jo-Shu

    2015-05-01

    The applications of microalgae in cosmetic products have recently received more attention in the treatment of skin problems, such as aging, tanning and pigment disorders. There are also potential uses in the areas of anti-aging, skin-whitening, and pigmentation reduction products. While algae species have already been used in some cosmetic formulations, such as moisturizing and thickening agents, algae remain largely untapped as an asset in this industry due to an apparent lack of utility as a primary active ingredient. This review article focuses on integrating studies on algae pertinent to skin health and beauty, with the purpose of identifying serviceable algae functions in practical cosmetic uses. Copyright © 2014 Elsevier Ltd. All rights reserved.

  11. Chemical examination of the Red alga Acanthophora spicifera

    Digital Repository Service at National Institute of Oceanography (India)

    Wahidullah, S.; Kamat, S.Y.

    Analyses of petroleum ether and chloroform extracts of the marine alga Acanthophora spicifera exhibiting antifertility activity led to the isolation of sterols and fatty acids as well as the rare dipeptides aurantiamides. All the compounds were...

  12. Chemical examination of the brown alga Stoechospermum marginatum (C. Agardh)

    Digital Repository Service at National Institute of Oceanography (India)

    Wahidullah, S.; DeSouza, L.; Kamat, S.Y.

    The crude methalonic extract of marine algae Stoechospermum marginatum from west coast of India was found to have spasmolytic activity. Search for the pharmacologically active compounds led to the isolation of steroids, fatty acids and an ester...

  13. The role of algae in agriculture: a mathematical study.

    Science.gov (United States)

    Tiwari, P K; Misra, A K; Venturino, Ezio

    2017-06-01

    Synthetic fertilizers and livestock manure are nowadays widely used in agriculture to improve crop yield but nitrogen and phosphorous runoff resulting from their use compromises water quality and contributes to eutrophication phenomena in waterbeds within the countryside and ultimately in the ocean. Alternatively, algae could play an important role in agriculture where they can be used as biofertilizers and soil stabilizers. To examine the possible reuse of the detritus generated by dead algae as fertilizer for crops, we develop three mathematical models building upon each other. A system is proposed in which algae recover waste nutrients (nitrogen and phosphorus) for reuse in agricultural production. The results of our study show that in so doing, the crop yield may be increased and simultaneously the density of algae in the lake may be reduced. This could be a way to mitigate and possibly solve the environmental and economic issues nowadays facing agriculture.

  14. Modelization of tritium transfer into the organic compartments of algae

    International Nuclear Information System (INIS)

    Bonotto, S.; Gerber, G.B.; Arapis, G.; Kirchmann, R.

    1982-01-01

    Uptake of tritium oxide and its conversion into organic tritium was studied in four different types of algae with widely varying size and growth characteristics (Acetabularia acetabulum, Boergesenia forbesii, two strains of Chlamydomonas and Dunaliella bioculata). Water in the cell and the vacuales equilibrates rapidly with external tritium water. Tritium is actively incorporated into organically bound form as the organisms grow. During the stationary phase, incorporation of tritium is slow. There exists a discrimination against the incorporation of tritium into organically bound form. A model has been elaborated taking in account these different factors. It appears that transfer of organic tritium by algae growing near the sites of release would be significant only for actively growing algae. Algae growing slowly may, however, be useful as cumulative indicators of discontinuous tritium release. (author)

  15. Scenario analysis of large scale algae production in tubular photobioreactors

    NARCIS (Netherlands)

    Slegers, P.M.; Beveren, van P.J.M.; Wijffels, R.H.; Straten, van G.; Boxtel, van A.J.B.

    2013-01-01

    Microalgae productivity in tubular photobioreactors depends on algae species, location, tube diameter, biomass concentration, distance between tubes and for vertically stacked systems, the number of horizontal tubes per stack. A simulation model for horizontal and vertically stacked horizontal

  16. Studies on allergenic algae of Delhi area: botanical aspects.

    Science.gov (United States)

    Mittal, A; Agarwal, M K; Shivpuri, D N

    1979-04-01

    To study distribution of algae in and around Delhi aerobiological surveys were undertaken for two consecutive years (September, 1972, to August, 1974). The surveys were accomplished by (a) slide exposure method and (b) culture plate exposure method. A total of 850 slides were exposed using Durham's gravity sampling device. Of these, 560 slides were exposed during 1973 (272 slides at two meter and 288 at ten meter height) and the rest (290 slides) were exposed during 1974 at ten meter height. A total of 858 culture plates were exposed (276 for one hour and 282 for two hours) during 1973 and the rest (300 culture plates) were exposed during 1974 at ten meter height for two hours duration only. Air was found to be rich in algae flora during the months of September to November. The dominant forms of algae present were all blue greens. This might be due to the relative greater resistance of blue green algae to unfavorable conditions.

  17. Lab on a chip technologies for algae detection: a review.

    Science.gov (United States)

    Schaap, Allison; Rohrlack, Thomas; Bellouard, Yves

    2012-08-01

    Over the last few decades, lab on a chip technologies have emerged as powerful tools for high-accuracy diagnosis with minute quantities of liquid and as tools for exploring cell properties in general. In this paper, we present a review of the current status of this technology in the context of algae detection and monitoring. We start with an overview of the detection methods currently used for algae monitoring, followed by a review of lab on a chip devices for algae detection and classification, and then discuss a case study based on our own research activities. We conclude with a discussion on future challenges and motivations for algae-oriented lab on a chip technologies. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  18. Relación entre los problemas médicos y los problemas de comportamiento en el perro y el gato doméstico

    OpenAIRE

    Camps Morey, Tomàs

    2015-01-01

    El objetivo de esta tesis es estudiar la relación entre los problemas de comportamiento del perro y el gato doméstico y su estado de salud. Consta de dos grandes partes. La primera estudia el papel de los problemas médicos sobre el comportamiento del animal. En la segunda se analiza la relación inversa. El comportamiento de cualqu...

  19. Diversity and ecology of filamentous green conjugate algae

    OpenAIRE

    Strouhalová, Pavla

    2016-01-01

    Filamentous conjugating algae have a cosmopolitan distribution. They often inhabit fragile freshwater habitats such as temporary hydrated ditches or puddles of melting snow. Occurrence in this environment entails having to deal with extreme conditions. That helps them to variously adaptation and also the formation of resistant stages. Algae belonging to this group have an important role in nature, because they are often the first species that inhabit newly created habitats and consequently al...

  20. Cytotoxicity of Algae Extracts on Normal and Malignant Cells

    OpenAIRE

    Bechelli, Jeremy; Coppage, Myra; Rosell, Karen; Liesveld, Jane

    2011-01-01

    Algae preparations are commonly used in alternative medicine. We examined the effects of algae extracts on normal hematopoietic cells and leukemia cells. Ethanol extracts were prepared of Dunaliella salina (Dun), Astaxanthin (Ast), Spirulina platensis (Spir), and Aphanizomenon flos-aquae (AFA). Cell viability effects were completed by Annexin staining. Ast and AFA inhibited HL-60 and MV-4-11 whereas Dun and Spir had no effect. Primary AML blasts demonstrated increased apoptosis in AFA. ...

  1. Algae Reefs in Shark Bay, Western Australia, Australia

    Science.gov (United States)

    1990-01-01

    Numerous algae reefs are seen in Shark Bay, Western Australia, Australia (26.0S, 113.5E) especially in the southern portions of the bay. The south end is more saline because tidal flow in and out of the bay is restricted by sediment deposited at the north and central end of the bay opposite the mouth of the Wooramel River. This extremely arid region produces little sediment runoff so that the waters are very clear, saline and rich in algae.

  2. Thermal algae in certain radioactive springs in Japan, (3)

    International Nuclear Information System (INIS)

    Mifune, Masaaki; Hirose, Hiroyuki.

    1982-01-01

    Shikano Hot Springs are located at five km to the south of Hamamura Station on the Sanin Line in Tottori Prefecture. The water temperature and the pH of the springs are 40.2 - 61.2 0 C, and 7.5 - 7.8, respectively. They belong to simple thermals. Hamamura Hot Springs are located in the neighbourhood of Hamamura Station. The highest radon content of the hot springs is 175.1 x 10 -10 Ci/l, and the great part of the springs belong to radioactive ones. From the viewpoint of the major ionic constituents, they are also classified under weak salt springs, sulfated salt springs, and simple thermals. Regarding the habitates of the algal flora, the water temperature and the pH of the springs are 28.0 - 68.0 0 C, and 6.8 - 7.4, respectively. The thermal algae found by Ikoma and Doi at Hamamura Hot Springs were two species of Cyanophyceae. By the authors, nine species and one variety of Cyanophyceae including Ikoma and Doi's two species were newly found at Shikano and Hamamura Hot Springs. Chlorophyceous alga was not found. The dominant thermal algae of these hot springs were Mastigocladus laminosus, and the other algae which mainly consist of Oscillatoriaceous algae. From these points, it seems that the thermal algae of Shikano and Hamamura Hot Springs belong to the normal type of thermal algae, and they are different from the thermal algae of Ikeda Mineral Springs and Masutomi Hot Springs which belong to strongly radioactive springs. (author)

  3. Using the marine unicellular algae in biological monitoring

    OpenAIRE

    Kapkov V. I.; Shoshina E. V.; Belenikina O. A.

    2017-01-01

    The possibility of using marine unicellular algae from natural plankton community in biomonitoring of pollution by heavy metals has been investigated. Algae of different taxa from the Mediterranean Sea have been allocated to culture. In the laboratory the culture conditions – i. e. growth medium, temperature, photoperiod, level of artificial light and initial density – have been selected for every species. The impact of heavy metals (Hg, Cd, Cu, Pb) in the form of chloride salts on the growth...

  4. Biodiesel Production From Algae to Overcome the Energy Crisis

    Directory of Open Access Journals (Sweden)

    Suliman Khan

    2017-10-01

    Full Text Available The use of energy sources has reached at the level that whole world is relying on it. Being the major source of energy, fuels are considered the most important. The fear of diminishing the available sources thirst towards biofuel production has increased during last decades. Considering the food problems, algae gain the most attention to be used as biofuel producers. The use of crop and food-producing plants will never be a best fit into the priorities for biofuel production as they will disturb the food needs. Different types of algae having the different production abilities. Normally algae have 20%–80% oil contents that could be converted into different types of fuels such as kerosene oil and biodiesel. The diesel production from algae is economical and easy. Different species such as tribonema, ulothrix and euglena have good potential for biodiesel production. Gene technology can be used to enhance the production of oil and biodiesel contents and stability of algae. By increasing the genetic expressions, we can find the ways to achieve the required biofuel amounts easily and continuously to overcome the fuels deficiency. The present review article focusses on the role of algae as a possible substitute for fossil fuel as an ideal biofuel reactant.

  5. Algae as a Biofuel: Renewable Source for Liquid Fuel

    Directory of Open Access Journals (Sweden)

    Vijay Kant Pandey

    2016-09-01

    Full Text Available Biofuels produced by algae may provide a feasible alternative to fossil fuels like petroleum sourced fuels. However, looking to limited fossil fuel associated with problems, intensive efforts have been given to search for alternative biofuels like biodiesel. Algae are ubiquitous on earth, have potential to produce biofuel. However, technology of biofuel from algae facing a number of hurdles before it can compete in the fuel market and be broadly organized. Different challenges include strain identification and improvement of algal biomass, both in terms of biofuel productivity and the production of other products to improve the economics of the entire system. Algal biofuels could be made more cost effective by extracting other valuable products from algae and algal strains. Algal oil can be prepared by culture of algae on municipal and industrial wastewaters. Photobioreactors methods provide a controlled environment that can be tailored to the specific demands of high production of algae to attain a consistently good yield of biofuel. The algal biomass has been reported to yield high oil contents and have good amount of the biodiesel production capacity. In this article, it has been attempted to review to elucidate the approaches for making algal biodiesel economically competitive with respect to petrodiesel. Consequently, R & D work has been carried out for the growth, harvesting, oil extraction and conversion to biodiesel from algal sources.

  6. Radionuclides and trace metals in eastern Mediterranean Sea algae

    Energy Technology Data Exchange (ETDEWEB)

    Al-Masri, M.S. E-mail: msmasri@aec.org.sy; Mamish, S.; Budier, Y

    2003-07-01

    Three types of sea alga distributed along the Syrian coast have been collected and analyzed for radioactivity and trace elements. Results have shown that {sup 137}Cs concentrations in all the analyzed sample were relatively low (less than 1.2 Bq kg{sup -1} dry weight) while the levels of naturally occurring radionuclides, such as {sup 210}Po and {sup 210}Pb, were found to be high in most samples; the highest observed value (27.43 Bq kg{sup -1} dry weight) for {sup 210}Po being in the red Jania longifurca alga. In addition, most brown alga species were also found to accumulate {sup 210}Po, which indicates their selectivity to this isotope. On the other hand, brown alga (Cystoseira and Sargassum Vulgare) have shown a clear selectivity for some trace metals such as Cr, As, Cu and Co, this selectivity may encourage their use as biomonitor for pollution by trace metals. Moreover, the red alga species were found to contain the highest levels of Mg while the brown alga species were found to concentrate Fe, Mn, Na and K and nonmetals such as Cl, I and Br.

  7. Development of Green Fuels From Algae - The University of Tulsa

    Energy Technology Data Exchange (ETDEWEB)

    Crunkleton, Daniel; Price, Geoffrey; Johannes, Tyler; Cremaschi, Selen

    2012-12-03

    The general public has become increasingly aware of the pitfalls encountered with the continued reliance on fossil fuels in the industrialized world. In response, the scientific community is in the process of developing non-fossil fuel technologies that can supply adequate energy while also being environmentally friendly. In this project, we concentrate on green fuels which we define as those capable of being produced from renewable and sustainable resources in a way that is compatible with the current transportation fuel infrastructure. One route to green fuels that has received relatively little attention begins with algae as a feedstock. Algae are a diverse group of aquatic, photosynthetic organisms, generally categorized as either macroalgae (i.e. seaweed) or microalgae. Microalgae constitute a spectacularly diverse group of prokaryotic and eukaryotic unicellular organisms and account for approximately 50% of global organic carbon fixation. The PI's have subdivided the proposed research program into three main research areas, all of which are essential to the development of commercially viable algae fuels compatible with current energy infrastructure. In the fuel development focus, catalytic cracking reactions of algae oils is optimized. In the species development project, genetic engineering is used to create microalgae strains that are capable of high-level hydrocarbon production. For the modeling effort, the construction of multi-scaled models of algae production was prioritized, including integrating small-scale hydrodynamic models of algae production and reactor design and large-scale design optimization models.

  8. Micro-algae: French players discuss the matter

    International Nuclear Information System (INIS)

    Bouveret, T.

    2013-01-01

    About 75000 species of algae have been reported so far, the domains of application are huge and investment are increasing all around the world. One of the difficulties is to find the most appropriate algae to a specific application. Some development programs have failed scientifically or economically for instance the production of protein for animal food from the chlorella algae or the production of bio-fuel from C14-C18 chains, from zeaxanthine and from phycoerytrine. On the other side some research programs have led to promising industrial applications such as the production of food for fish and farm animals. Some research fields are completely innovative such as the use of micro-algae for the construction of bio-walls for buildings. Micro-algae are diverse and fragile. Photo-bioreactors have been designed to breed fragile algae like some types of chlorophycees used in bio-fuel and in cosmetics, a prototype has been tested for 15 months and its production is about 2 kg of dry matter a day. (A.C.)

  9. Biofuels and algae; Biocarburants, la promesse des algues

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2011-07-15

    Bio-fuels based on micro-algae are promising, their licensing for being used in plane fuels in a mix containing 50% of fossil kerosene is expected in the coming months. In United-States research on bio-fuels has been made more important since 2006 when 2 policies were launched: 'Advanced energy initiative' and 'Twenty-in-ten', the latter aiming to develop alternative fuels. In Europe less investment has been made concerning micro-algae fuels but research programs were launched in Spain, United-Kingdom and France. In France 3 important projects were launched: SHAMASH (2006-2010) whose aim is to produce lipidic fuels from micro-algae, ALGOHUB (2008-2013) whose aim is to use micro-algae as a raw material for humane and animal food, medicine and cosmetics, SYMBIOSE (2009-2011) whose aim is the optimization of the production of methane through the anaerobic digestion of micro-algae, SALINALGUE (2010-2016) whose aim is to grow micro-algae for the production of bio-energies and bio-products. (A.C.)

  10. Radionuclides and trace metals in eastern Mediterranean Sea algae

    International Nuclear Information System (INIS)

    Al-Masri, M.S.; Mamish, S.; Budier, Y.

    2003-01-01

    Three types of sea alga distributed along the Syrian coast have been collected and analyzed for radioactivity and trace elements. Results have shown that 137 Cs concentrations in all the analyzed sample were relatively low (less than 1.2 Bq kg -1 dry weight) while the levels of naturally occurring radionuclides, such as 210 Po and 210 Pb, were found to be high in most samples; the highest observed value (27.43 Bq kg -1 dry weight) for 210 Po being in the red Jania longifurca alga. In addition, most brown alga species were also found to accumulate 210 Po, which indicates their selectivity to this isotope. On the other hand, brown alga (Cystoseira and Sargassum Vulgare) have shown a clear selectivity for some trace metals such as Cr, As, Cu and Co, this selectivity may encourage their use as biomonitor for pollution by trace metals. Moreover, the red alga species were found to contain the highest levels of Mg while the brown alga species were found to concentrate Fe, Mn, Na and K and nonmetals such as Cl, I and Br

  11. Metodología para la solución de problemas algorítmicos

    OpenAIRE

    José Francisco Amador Montaño

    2015-01-01

    RESUMEN La solución de problemas algorítmicos es un tema que concierne a muchas especialidades. En "ciencias de la computación" es necasario acordar una metodología para la solución de dichos problemas, con el propósito de mantener un lenguaje común a la hora de abordarlas.

  12. Levantamento de problemas comportamentais/emocionais em um ambulatório para adolescentes

    Directory of Open Access Journals (Sweden)

    Benedita Salete Costa Lima Valverde

    2012-12-01

    Full Text Available Este estudo teve como objetivo identificar os principais problemas comportamentais e emocionais percebidos por adolescentes que frequentam um ambulatório de saúde. Participaram 320 adolescentes que não estavam em atendimento psicoterápico e que responderam, na sala de espera de um ambulatório, o Youth Self Report. O principal problema relatado foi Ansiedade/Depressão. Os meninos obtiveram escores mais altos em Problemas Sociais e mais baixos em Comportamento Delinquente; as meninas apresentaram-se com menos problemas no agrupamento Problemas Somáticos e com mais problemas em Ansiedade/Depressão. Quanto à faixa etária, observou-se que Problemas Sociais esteve associado ao início da adolescência. Quanto à incidência, menos de um quarto dos adolescentes apresentaram-se com problemas, sugerindo que a adolescência não é um período de turbulência. Observou-se que alguns adolescentes necessitam de uma avaliação mais detalhada, pois relataram comportamentos indicativos de transtornos mentais. Conclui-se a necessidade de profissionais de saúde mental integrarem a equipe de saúde que atende adolescentes.

  13. Metodología para la solución de problemas algorítmicos

    Directory of Open Access Journals (Sweden)

    José Francisco Amador Montaño

    2015-02-01

    La solución de problemas algorítmicos es un tema que concierne a muchas especialidades. En "ciencias de la computación" es necasario acordar una metodología para la solución de dichos problemas, con el propósito de mantener un lenguaje común a la hora de abordarlas.

  14. Photoprotection strategies of the alga Nannochloropsis gaditana.

    Science.gov (United States)

    Chukhutsina, Volha U; Fristedt, Rikard; Morosinotto, Tomas; Croce, Roberta

    2017-07-01

    Nannochloropsis spp. are algae with high potential for biotechnological applications due to their capacity to accumulate lipids. However, little is known about their photosynthetic apparatus and acclimation/photoprotective strategies. In this work, we studied the mechanisms of non-photochemical quenching (NPQ), the fast response to high light stress, in Nannochloropsis gaditana by "locking" the cells in six different states during quenching activation and relaxation. Combining biochemical analysis with time-resolved fluorescence spectroscopy, we correlated each NPQ state with the presence of two well-known NPQ components: de-epoxidized xanthophylls and stress-related antenna proteins (LHCXs). We demonstrated that after exposure to strong light, the rapid quenching that takes place in the antennas of both photosystems was associated with the presence of LHCXs. At later stages, quenching occurs mainly in the antennas of PSII and correlates with the amount of de-epoxidised xanthophylls. We also observed changes in the distribution of excitation energy between photosystems, which suggests redistribution of excitation between photosystems as part of the photo-protective strategy. A multistep model for NPQ induction and relaxation in N. gaditana is discussed. Copyright © 2017. Published by Elsevier B.V.

  15. Coccolithophorid algae culture in closed photobioreactors.

    Science.gov (United States)

    Moheimani, Navid R; Isdepsky, Andreas; Lisec, Jan; Raes, Eric; Borowitzka, Michael A

    2011-09-01

    The feasibility of growth, calcium carbonate and lipid production of the coccolithophorid algae (Prymnesiophyceae), Pleurochrysis carterae, Emiliania huxleyi, and Gephyrocapsa oceanica, was investigated in plate, carboy, airlift, and tubular photobioreactors. The plate photobioreactor was the most promising closed cultivation system. All species could be grown in the carboy photobioreactor. However, P. carterae was the only species which grew in an airlift photobioreactor. Despite several attempts to grow these coccolithophorid species in the tubular photobioreactor (Biocoil), including modification of the airlift and sparger design, no net growth could be achieved. The shear produced by turbulence and bubble effects are the most likely reasons for this failure to grow in the Biocoil. The highest total dry weight, lipid and calcium carbonate productivities achieved by P. carterae in the plate photobioreactors were 0.54, 0.12, and 0.06 g L(-1) day(-1) respectively. Irrespective of the type of photobioreactor, the productivities were P. carterae > E. huxleyi > G. oceanica. Pleurochrysis carterae lipid (20-25% of dry weight) and calcium carbonate (11-12% of dry weight) contents were also the highest of all species tested. Copyright © 2011 Wiley Periodicals, Inc.

  16. Is the Future Really in Algae?

    Science.gov (United States)

    Trent, Jonathan

    2011-01-01

    Having just emerged from the warmest decade on record and watching as the oceans acidify, global resources peak, the world's population continues to climb, and nearly half of all known species face extinction by the end of the century. We stand on the threshold of one of the most important transition in human history-the transition from hunting-and-gathering our energy to cultivating sustainable, carbon-neutral, environmentally-friendly energy supplies. Can we "cultivate" enerm without competing with agriculture for land, freshwater, or fertilizer? Can we develop an "ecology of technology" that optimizes our use of limited resources? Is human activity compatible with improved conditions in the world's oceans? Will our ingenuity prevail in time to make a difference for our children and the children of all species? With support from NASA ARMD and the California Energy Commission, a group of dedicated scientists and engineers are working on a project called OMEGA (Offshore Membrane Enclosures for Growing Algae), to provide practical answers to these critical questions and to leave a legacy of hope for the oceans and for the future.

  17. Detection of Cyanotoxins in Algae Dietary Supplements

    Directory of Open Access Journals (Sweden)

    Audrey Roy-Lachapelle

    2017-02-01

    Full Text Available Algae dietary supplements are marketed worldwide as natural health products. Although their proprieties have been claimed as beneficial to improve overall health, there have been several previous reports of contamination by cyanotoxins. These products generally contain non-toxic cyanobacteria, but the methods of cultivation in natural waters without appropriate quality controls allow contamination by toxin producer species present in the natural environment. In this study, we investigated the presence of total microcystins, seven individual microcystins (RR, YR, LR, LA, LY, LW, LF, anatoxin-a, dihydroanatoxin-a, epoxyanatoxin-a, cylindrospermopsin, saxitoxin, and β-methylamino-l-alanine in 18 different commercially available products containing Spirulina or Aphanizomenon flos-aquae. Total microcystins analysis was accomplished using a Lemieux oxidation and a chemical derivatization using dansyl chloride was needed for the simultaneous analysis of cylindrospermopsin, saxitoxin, and β-methylamino-l-alanine. Moreover, the use of laser diode thermal desorption (LDTD and ultra-high performance liquid chromatography (UHPLC both coupled to high resolution mass spectrometry (HRMS enabled high performance detection and quantitation. Out of the 18 products analyzed, 8 contained some cyanotoxins at levels exceeding the tolerable daily intake values. The presence of cyanotoxins in these algal dietary supplements reinforces the need for a better quality control as well as consumer’s awareness on the potential risks associated with the consumption of these supplements.

  18. Lugar de la ciencia, la tecnología y la religión en la cultura emergente

    Directory of Open Access Journals (Sweden)

    Juan Antonio Estrada

    2015-01-01

    Full Text Available No hay duda sobre el actual cambio de época. Se traduce en nombres como postmodernidad, tardo-modernidad y globalización, para designar la nueva fase histórica que hemos iniciado. Desde otra perspectiva podemos hablar de la tercera revolución industrial, que pone el énfasis en la ciencia y en la tecnología como motores del progreso y de la evolución social. Se trata de una auténtica revolución en la que surge un nuevo paradigma de comprensión del ser humano y del mundo. La sociedad como un todo está influida por el cambio científico técnico, con lo que ya no hay áreas exentas y la ciencia plantea problemas en todos los ámbitos culturales, incluida la religión.

  19. ESTUDO DE PROBLEMAS DE ENFERMAGEM REFERENTES AO CABELO E COURO CABELUDO EM PACIENTES HOSPITALIZADOS

    Directory of Open Access Journals (Sweden)

    Maria Romana Friedlander

    Full Text Available A autora procurou identificar os tipos e os problemas de enfermagem referentes ao cabelo e couro cabeludo, apresentados por pacientes internados em clínicas médicas e cirúrgicas gerais de um hospital governamental de ensino. Identificou 4 classes de problemas: estado de limpeza, lesões, infestações e penteação. Cada classe foi subdividida em graus os quais foram denominados tipos de problemas. A proporção de problemas por paciente encontrada foi 0,80 e a proporção de pacientes com problemas foi 58%. Foram também estudadas algumas condições que podem intervir no cuidado ao cabelo e ao couro cabeludo e foram obtidas informações sobre hábitos e costumes apresentados pelos pacientes.

  20. Estructura orbital en el Problema Restringido Rectilíneo Isósceles

    Science.gov (United States)

    Orellana, R. B.

    Para definir problemas en Mecánica Celeste se utilizan diferentes parámetros. El conocimiento de la dinámica del problema para valores particulares de estos parámetros nos permite entender el comportamiento en casos más generales. El Problema Restringido Rectilíneo Isósceles puede ser considerado como el caso límite del Problema de Sitnikov cuando la excentricidad tiende a uno o como el Problema Isósceles cuando la masa central tiende a cero. Se ha compactificado el espacio de fases y analizado la dinámica en el límite. Esto ha permitido separar el espacio de fases en diferentes regiones dependiendo de las clases de órbitas.

  1. Lipid oxidation in base algae oil and water-in-algae oil emulsion: Impact of natural antioxidants and emulsifiers.

    Science.gov (United States)

    Chen, Bingcan; Rao, Jiajia; Ding, Yangping; McClements, David Julian; Decker, Eric Andrew

    2016-07-01

    The impact of natural hydrophilic antioxidants, metal chelators, and hydrophilic antioxidant/metal chelator mixture on the oxidative stability of base algae oil and water-in-algae oil emulsion was investigated. The results showed that green tea extract and ascorbic acid had greatest protective effect against algae oil oxidation and generated four day lag phase, whereas rosmarinic acid, grape seed extract, grape seed extract polymer, deferoxamine (DFO), and ethylenediaminetetraacetic acid (EDTA) had no significant protective effect. Besides, there was no synergistic effect observed between natural antioxidants and ascorbic acid. The emulsifiers are critical to the physicochemical stability of water-in-algae oil emulsions. Polyglycerol polyricinoleate (PGPR) promoted the oxidation of emulsion. Conversely, the protective effect on algae oil oxidation was appreciated when defatted soybean lecithin (PC 75) or defatted lyso-lecithin (Lyso-PC) was added. The role of hydrophilic antioxidants in emulsion was similar to that in algae oil except EDTA which demonstrated strong antioxidative effect in emulsion. The results could provide information to build up stable food products containing polyunsaturated fatty acids (PUFA). Copyright © 2016 Elsevier Ltd. All rights reserved.

  2. SOIL ALGAE OF BLADE OF COIL IN DONETSK REGION

    Directory of Open Access Journals (Sweden)

    Maltseva I.A.

    2011-12-01

    Full Text Available On territory of Donbass for more than 200 years the underground coal mining has produced, accompanied by the formation of the mine dumps. Finding ways to reduce their negative impact on the environment should be based on their comprehensive study. The soil algae are active participants in the syngenetic processes in industrial dumps of different origin. The purpose of this paper is to identify the species composition and dominant algae groups in dump mine SH/U5 “Western” in the western part of Donetsk.The test blade is covered with vegetation to the middle from all sides, and on the north side of 20-25 m to the top. The vegetation cover of the lower and middle tiers of all the exposures range in 70-80%. Projective vegetation cover of upper tiers of the northern, north-eastern and north-western exposures are in the range of 20-40%, other – 5-10%. We revealed some 38 algae species as a result of our research in southern, northern, western, and eastern slopes of the blade “Western”. The highest species diversity has Chlorophyta - 14 species (36.8% of the total number of species, then Cyanophyta - 9 (23,7%, Bacillariophyta - 7 (18,4%, Xantophyta - 5 (13.2%, and Eustigmatophyta - 3 (7.9%. The dominants are represented by Hantzschia amphyoxys (Ehrenberg Grunow in Cleve et Grunow, Bracteacoccus aerius, Klebsormidium flaccidum (Kützing Silva et al., Phormidium autumnale, Pinnularia borealis Ehrenberg, Planothidium lanceolatum (Brebisson in Kützing Bukhtiyarova, Xanthonema exile (Klebs Silva.It should be noted that the species composition of algae groups in different slopes of the blade was significantly different. Jacquard coefficient was calculated for algae communities varied in the range of 15,4-39,1%. The smallest number of algae species was observed on the southern slope of the blade (14 species, maximum was registered in the areas of north and west slopes. Differences in the species composition of algae were also observed in three

  3. Mucormicosis: Una micosis emergente

    Directory of Open Access Journals (Sweden)

    Iris Tiraboschi

    2012-02-01

    Full Text Available El objetivo de este trabajo es presentar la incidencia, frecuencia, características clínicas y evolución de los pacientes con mucormicosis atendidos en el Hospital de Clínicas José de San Martín, Universidad de Buenos Aires, entre los años 1982 y 2010. Durante ese período se diagnosticaron 10 casos de mucormicosis. Los tres primeros entre 1982 y 2004 y los últimos 7 entre 2005 y 2010. La incidencia y frecuencia de esta enfermedad, para el período 1980-2004 fue 0.13 pacientes/año y 0.1 casos/10 000 egresos (IC 95%: 0.00 a 0.3 respectivamente. En el período 2005-2010 la incidencia fue 0.86 pacientes/año y la frecuencia de 1.1 casos/10 000 egresos (IC 95%: 0.5 a 2.4. Hubo nueve casos de mucormicosis rinosinuso-orbitaria, siete en pacientes con diabetes mellitus, uno en una paciente con una hemopatía maligna y neutropenia, y el restante en un paciente con HIV/sida que además estaba neutropénico y con un síndrome hemofagocítico. En una paciente se realizó el diagnóstico post mortem de mucormicosis pulmonar. El diagnóstico se efectuó por la observación de filamentos cenocíticos en los diez casos. Hubo desarrollo de mucorales en los cultivos de 8/9 pacientes; cinco Rhizopus spp y tres Mucor spp. Todos los pacientes recibieron un tratamiento inicial con anfotericina B deoxicolato, que en tres de ellos fue continuado con anfotericina B liposomal, y cirugía. Tres enfermos recibieron además un tratamiento adyuvante con oxigeno hiperbárico. La mortalidad fue 30%.

  4. Daniel Link y la clase: problemas de convivencia

    Directory of Open Access Journals (Sweden)

    Mariana Catalin

    2016-12-01

    Full Text Available El presente trabajo busca realizar un acercamiento a los modos de la producción ensayística de Daniel Link a partir de un interrogante que cruza toda su producción: la pregunta por cómo vivir juntos. Para esto, en una primera instancia, se realiza un análisis de la aparición explícita del interrogante en una serie de textos del blog del autor (linkillo.blogspot.com, para observar qué problemas se condensan en torno al mismo. A partir de este contexto, en un segundo momento, se abre un recorrido por dos de sus más recientes libros de ensayos, Clases. Literatura y disidencia (2005 y Fantasmas. Imaginación y sociedad (2009. Allí, además de los usos que se articulan a partir de su aparición explícita, el interrogante permite pensar la relación entre clasificación y cualificación, dos conceptos centrales en la producción de Link.

  5. El suicidio en los adolescentes: Un problema en crecimiento

    Directory of Open Access Journals (Sweden)

    Wendy Cervantes P.

    2014-06-01

    Full Text Available ResumenEl suicidio es un fenómeno humano universal que ha estado presente en todas las épocas históricas. Por lo tanto este artículo solo pretende ser una revisión teórica sobre lo que hasta la fecha se conoce sobre los factores implicados en el suicidio en población adolescente. En el intervienen múltiples factores, entre los cuales se pueden citar: nivel socioeconómico de los padres, entorno familiar en el que se vive, las relaciones sexuales y la aceptación del género, padecer una enfermedad mental, nivel de estudios alcanzado, tener problemas en el colegio, con la justicia, entre otros. (Duazary 2008; 148-154AbstractSuicide is a universal human phenomenon that has been present throughout history. Therefore, this article, only wants to check what is known to date about the imply factors in suicides in adolescents. This is about something complicated, because of the many factors imply: social-professional level of the parents, sex, having any mental illness, Level of study, having problems in school, weather where they live, among others.Key Words: Consummated suicide; adolescents; protective factors; risk factors.

  6. GRAMSCI: Problemas de ética en Loscuadernos

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    Giuseppe Cacciatore

    2004-09-01

    Full Text Available Para abordar los problemas de ética que se pueden encontrar en el conjunto de la obra de Gramsci (y me refiero sea a los ámbitos generales de la elaboración relativa al complejo temático ética-política, sea a algunos aspectos específicos de la reflexión gramsciana sobre conceptos como voluntad, espontaneidad, sujeto etc. es necesario referirse a los que se pueden considerar como los dos dispositivos teóricos fundamentales que están en la base de su pensamiento: la criticidad y la historiocidad. Si en el mismo marxismo 1 ha sido posible introducir elementos no secundarios de corrección de planteamientos mecanicistas y dogmáticos, y si el nexo entre ética y política ha adquirido un papel tan relevante como el que existe entre política y economía, ello se debe a la capacidad manifestada por Gramsci de mantener siempre constitutivamente abierta la tensión entre la criticidad de los procesos de control y modificación de la praxis por parte de la inteligencia social y la visión no rígidamente finalista y lineal-evolutiva de la historia.

  7. Nietzsche y Freud ante el problema de la verdad

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    Leandro Drivet

    2016-01-01

    Full Text Available Este trabajo se propone reflexionar acerca del problema de la verdad en las obras de Friedrich Nietzsche y Sigmund Freud, a las que se considera estrechamente vinculadas. Esta perspectiva permitirá identificar el carácter específico de la “verdad”, cuyos vestigios detectaron ambos “psicólogos” transvaloradores; apreciar la doble valoración nietzscheana de la verdad, usualmente reducida a un rechazo unilateral; y repensar la pretensión de cientificidad del psicoanálisis, actualmente despreciada en nombre de una sospechosa reivindicación anticientífica. Se concluye con el postulado de que Nietzsche y Freud conciben a la verdad como una lucha contra las resistencias, lo que les conduce a fundar una nueva escucha.

  8. El problema de vivienda de los "con techo"

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    Alfredo Rodríguez

    2004-12-01

    Full Text Available La política de vivienda social en Chile es considerada un éxito. En los últimos quince años la producción masiva de viviendas ha logrado reducir el déficit habitacional, y muchos gobiernos de América Latina están imitando su modelo de financiamiento. Sin embargo, esta política exitosa ha terminado creando nuevos problemas urbanos y sociales: segregación, fragmentación, inseguridad, hacinamiento. En consecuencia, se plantea que una política de vivienda social sensata debe hoy incorporar nuevos criterios, relacionados fundamentalmente con la calidad de viviendas, la localización de los conjuntos construidos y la movilidad residencial de los beneficiarios.Chilen social housing policy is considered a success. During the last fifteen years the massive housing production has managed to reduce housing deficit, and many Latin American governments are imitating it financing model. However, this succesfull policy has ended up by creating new urban and social problems: segregation, fragmentation, insecurity, overcrowding. Consequently, it is pointed that a proper housing policy must currently include new criteria, mainly related to the quality of the product, the locating of the built neighborhoods and beneficiaries residential mobility.

  9. Similaridades entre semiologias na metodologia da aprendizagem baseada em problemas

    Directory of Open Access Journals (Sweden)

    Valdecir Bertoncello

    Full Text Available O Programa de Aprendizagem de Ginecologia e Obstetrícia da PUC-PR adota a aprendizagem baseada em problemas como metodologia de aprendizagem. Neste programa, são executados diversos casos clínicos que compõem seu conteúdo. Para cada caso clínico, os professores definem uma semiologia principal e as respectivas semiologias secundárias, a fim de definir o conjunto de ações ou procedimentos que os alunos devem executar. Visando à inserção das tecnologias da informação e comunicação no aprendizado dos alunos, foi desenvolvido um sistema que permite obter, passo a passo, as ações e procedimentos executados pelos alunos. O objetivo geral deste trabalho é conceber um modelo matemático e computacional que permita obter índices de similaridade entre as semiologias definidas pelos professores e as executadas pelos alunos.

  10. El problema del mal y la violencia en Colombia

    Directory of Open Access Journals (Sweden)

    Victor Eligio Espinosa Galán

    2015-09-01

    Full Text Available La historia de la humanidad está marcada por conflictos de distinta naturaleza: religiosos, ideológicos, raciales, etc., expresados en guerras, ataques terroristas, masacres, entre muchas otras situaciones de crueldad que muestran maldad y sevicia ejercida sobre seres humanos. Ante estos acontecimientos que nos enfrentan a la pregunta: ¿qué es aquello que nos hace humanos?, parece, en un contexto como el colombiano, que se asiste a formas oficiales de una agencia de maldad como posibilidad de un ethos cultural que hace plausibles las acciones más perversas en una desoladora minimización de responsabilidad moral, necesaria para construcción de una sociedad justa y en paz. Este escrito es un esfuerzo por pensar el problema del mal en el contexto de la violencia en Colombia y dar cuenta de algunos aspectos de la reflexión filosófica sobre el mal, el sufrimiento y el sentido de la vida; se toma como contexto el conflicto armado en Colombia y las narraciones de sus protagonistas.

  11. ¿Es eficaz el terrorismo? Consideraciones, problemas y marco de investigación futura

    OpenAIRE

    English, Richard

    2016-01-01

    La cuestión de «si es eficaz el terrorismo» es de vital importancia tanto desde el punto de vista práctico como intelectual; no obstante, ha sido ampliamente eclipsada por otras consideraciones desarrolladas dentro de la literatura académica sobre el terrorismo. En este contexto, el presente artículo aborda algunas de las aportaciones recientes al debate emergente relacionado con dicha cuestión; destaca varias de las problemáticas inherentes a la discusión académica con respecto a este ...

  12. Two-Step Evolution of Endosymbiosis between Hydra and Algae

    KAUST Repository

    Ishikawa, Masakazu

    2016-07-09

    In the Hydra vulgaris group, only 2 of the 25 strains in the collection of the National Institute of Genetics in Japan currently show endosymbiosis with green algae. However, whether the other non-symbiotic strains also have the potential to harbor algae remains unknown. The endosymbiotic potential of non-symbiotic strains that can harbor algae may have been acquired before or during divergence of the strains. With the aim of understanding the evolutionary process of endosymbiosis in the H. vulgaris group, we examined the endosymbiotic potential of non-symbiotic strains of the H. vulgaris group by artificially introducing endosymbiotic algae. We found that 12 of the 23 non-symbiotic strains were able to harbor the algae until reaching the grand-offspring through the asexual reproduction by budding. Moreover, a phylogenetic analysis of mitochondrial genome sequences showed that all the strains with endosymbiotic potential grouped into a single cluster (cluster γ). This cluster contained two strains (J7 and J10) that currently harbor algae; however, these strains were not the closest relatives. These results suggest that evolution of endosymbiosis occurred in two steps; first, endosymbiotic potential was gained once in the ancestor of the cluster γ lineage; second, strains J7 and J10 obtained algae independently after the divergence of the strains. By demonstrating the evolution of the endosymbiotic potential in non-symbiotic H. vulgaris group strains, we have clearly distinguished two evolutionary steps. The step-by-step evolutionary process provides significant insight into the evolution of endosymbiosis in cnidarians.

  13. [Toxicity of Coptis chinensis Rhizome Extracts to Green Algae].

    Science.gov (United States)

    Chen, Ya-nan; Yuan, Ling

    2015-05-01

    Coptis chinensis contains antiseptic alkaloids and thus its rhizomes and preparations are widely used for the treatment of.fish diseases. In order to realize the risk of water ecosystems produced by this medical herb and preparations used in aquaculture, the present experiment was carried out to study the toxicity of Coptis chinensis rhizome extract (CRE) to Scenedesmus oblique and Chlorella pyrenoidosa grown in culture solution with 0.00 (CK), 0.088 (Tl), 0.44 (T2) and 1.76 mg · L(-1) (T3) of CRE, respectively. The results show that low concentration of CRE (T1) inhibited the growth rate of the alga and high CRE (T2 and T3) ceased growth and reproductions. CRE also decreased the chlorophyll and proteins in alga cells, indicating the inhibition of photosynthesis and protein biosynthesis, which could be direct reasons for the low growth rate and death of green alga. The efflux of protons and substances from alga cells led to pH reduction and conductivity increment in culture solution with CRE. Furthermore, the activity of superoxide dismutase in alga increased at the beginning of CRE in T1 and T2 treatments but decreased as time prolonged which was in contrast to high CRE treatment. And the long exposure to low CRE treatment behaved otherwise. This suggests that the low concentration of CRE could induce the resistant reactions in alga at initial time but high CRE concentration or long exposure even at low CRE concentration could inhibit the enzyme synthesis. Similarly, malondialdehyde in alga increased as CRE concentrations increased in culture solutions, implying the damage and high permeability of cell membrane. In general, Chlorella pyrenoidosa was more sensitive to CRE. The abuse of rhizomes and preparations in aquaculture and intensive cultivation of Coptis chinensis plants in a large scale might produce ecological risks to primary productivity of water ecosystems.

  14. Two-step evolution of endosymbiosis between hydra and algae.

    Science.gov (United States)

    Ishikawa, Masakazu; Shimizu, Hiroshi; Nozawa, Masafumi; Ikeo, Kazuho; Gojobori, Takashi

    2016-10-01

    In the Hydra vulgaris group, only 2 of the 25 strains in the collection of the National Institute of Genetics in Japan currently show endosymbiosis with green algae. However, whether the other non-symbiotic strains also have the potential to harbor algae remains unknown. The endosymbiotic potential of non-symbiotic strains that can harbor algae may have been acquired before or during divergence of the strains. With the aim of understanding the evolutionary process of endosymbiosis in the H. vulgaris group, we examined the endosymbiotic potential of non-symbiotic strains of the H. vulgaris group by artificially introducing endosymbiotic algae. We found that 12 of the 23 non-symbiotic strains were able to harbor the algae until reaching the grand-offspring through the asexual reproduction by budding. Moreover, a phylogenetic analysis of mitochondrial genome sequences showed that all the strains with endosymbiotic potential grouped into a single cluster (cluster γ). This cluster contained two strains (J7 and J10) that currently harbor algae; however, these strains were not the closest relatives. These results suggest that evolution of endosymbiosis occurred in two steps; first, endosymbiotic potential was gained once in the ancestor of the cluster γ lineage; second, strains J7 and J10 obtained algae independently after the divergence of the strains. By demonstrating the evolution of the endosymbiotic potential in non-symbiotic H. vulgaris group strains, we have clearly distinguished two evolutionary steps. The step-by-step evolutionary process provides significant insight into the evolution of endosymbiosis in cnidarians. Copyright © 2016 Elsevier Inc. All rights reserved.

  15. Potências médias emergentes e reforma da arquitetura financeira mundial?: Uma análise do BRICS no G20

    Directory of Open Access Journals (Sweden)

    Leonardo Ramos

    2014-06-01

    Full Text Available A partir de 2000, na cúpula de Okinawa, o sistema G7/8 começou um movimento de outreach, ou seja, tanto de "alcançar" aqueles que se encontravam fora quanto de "expandir" o sistema G7/8. Neste sentido, pela primeira vez países não-participantes do G8 foram envolvidos tanto em encontros do G8 quanto em consultas pré-cúpula. Neste processo a cúpula de Gleneagles, em 2005, foi um marco, pois nesta pela primeira vez há um documento conjunto emitido por Brasil, Índia, China, África do Sul e México (BICSAM - Outreach Five ou Grupo dos Cinco (+5. Tal articulação entre tais países tendo como foco o sistema G7/8 vai ocorrer até a cúpula de L’Aquila, em 2009. Não obstante, como desde 2008 o G20 vem lidando com tais questões como um fórum de líderes e a partir de 2009 o BRIC passa a se reunir como coalizão, tal articulação paralela ao G8 perde sua relevância. Neste contexto, uma questão que surge diz respeito à relação entre BRICS e G20. Como se dá a ação de tal bloco emergente neste fórum? Qual seu impacto para as decisões tomadas no âmbito de tal fórum? Qual a importância da China neste processo? Questões deste tipo são relevantes uma vez que muitas abordagens sobre o G20 e sobre as potências médias emergentes falam a respeito da legitimidade e da representatividade do G20 sem, contudo, dar a devida atenção às potências médias emergentes, suas coalizões e formas de engajamento e articulação no âmbito do G20, e é neste contexto que se insere o presente artigo, que busca analisar a inserção e articulação do BRICS no âmbito do G20, suas potencialidades e limites.

  16. Onicomicoses por fungos emergentes: análise clínica, diagnóstico laboratorial e revisão

    Directory of Open Access Journals (Sweden)

    Araújo Adauto José Gonçalves de

    2003-01-01

    Full Text Available FUNDAMENTOS: As dermatomicoses causadas por fungos emergentes são entidades clínicas raras, à exceção das onicomicoses. Como certos fungos e leveduras podem residir na pele, a positividade em culturas de escamas ungueais deve ser interpretada obrigatoriamente em concordância com os respectivos dados clínicos, exames diretos das amostras, quantificação das colônias isoladas em relação aos pontos de inoculação e, principalmente, deve a positividade ser mantida após a repetição dos cultivos. A invasão da unha por fungos não dermatofíticos (nondermatophytic molds, NDM em diferentes estudos varia de 1,45% a 17,6%. OBJETIVOS: Os objetivos do trabalho são mostrar a ocorrência e realçar a importância dos fungos emergentes como causadores de onicomicose. MÉTODOS: As unhas dos pacientes atendidos nos consultórios dos dermatologistas foram examinadas, e, caso houvesse suspeita clínica de onicomicose, coletavam-se amostras que eram enviadas para exame micológico no laboratório. RESULTADOS: Neste estudo, foram avaliados 2.271 pacientes e diagnosticada onicomicose em 400 deles, sendo 264 com acometimento das unhas do pé, e 136 das unhas da mão. O agente etiológico foi confirmado pelo exame micológico direto e crescimento em cultura. A onicomicose por fungos emergentes representou 4,5% de todas as infecções de unha. Foram detectadas as leveduras do gênero Candida (49% como agentes etiológicos mais freqüentes de onicomicoses nas unhas das mãos e em mulheres. Em contraste, os dermatófitos foram os mais freqüentes de todas as onicomicoses dos pés, no total de 186 (46,5%. CONCLUSÃO: Ao contrário da rotina diagnóstica hoje utilizada, concluiu-se que o diagnóstico correto do agente etiológico da onicomicose não dermatofítica deve obedecer a determinados critérios, dos quais se destaca o conjunto formado pela positividade no exame direto, na cultura, com comprovação na repetição do exame.

  17. Los problemas de la Educación Ambiental: ¿es posible una Educación Ambiental integradora?

    OpenAIRE

    García, J. Eduardo

    2002-01-01

    En este trabajo se presentan diferentes problemas y carencias de la Educación Ambiental. Para el tratamiento de estos problemas se plantea una perspectiva integradora que supere los reduccionismos actualmente existentes

  18. Optimal control of algae growth by controlling CO 2 and nutrition flow using Pontryagin Maximum Principle

    Science.gov (United States)

    Mardlijah; Jamil, Ahmad; Hanafi, Lukman; Sanjaya, Suharmadi

    2017-09-01

    There are so many benefit of algae. One of them is using for renewable energy and sustainable in the future. The greater growth of algae will increasing biodiesel production and the increase of algae growth is influenced by glucose, nutrients and photosynthesis process. In this paper, the optimal control problem of the growth of algae is discussed. The objective function is to maximize the concentration of dry algae while the control is the flow of carbon dioxide and the nutrition. The solution is obtained by applying the Pontryagin Maximum Principle. and the result show that the concentration of algae increased more than 15 %.

  19. Method and apparatus using an active ionic liquid for algae biofuel harvest and extraction

    Science.gov (United States)

    Salvo, Roberto Di; Reich, Alton; Dykes, Jr., H. Waite H.; Teixeira, Rodrigo

    2012-11-06

    The invention relates to use of an active ionic liquid to dissolve algae cell walls. The ionic liquid is used to, in an energy efficient manner, dissolve and/or lyse an algae cell walls, which releases algae constituents used in the creation of energy, fuel, and/or cosmetic components. The ionic liquids include ionic salts having multiple charge centers, low, very low, and ultra low melting point ionic liquids, and combinations of ionic liquids. An algae treatment system is described, which processes wet algae in a lysing reactor, separates out algae constituent products, and optionally recovers the ionic liquid in an energy efficient manner.

  20. Algae-bacteria interactions: Evolution, ecology and emerging applications.

    Science.gov (United States)

    Ramanan, Rishiram; Kim, Byung-Hyuk; Cho, Dae-Hyun; Oh, Hee-Mock; Kim, Hee-Sik

    2016-01-01

    Algae and bacteria have coexisted ever since the early stages of evolution. This coevolution has revolutionized life on earth in many aspects. Algae and bacteria together influence ecosystems as varied as deep seas to lichens and represent all conceivable modes of interactions - from mutualism to parasitism. Several studies have shown that algae and bacteria synergistically affect each other's physiology and metabolism, a classic case being algae-roseobacter interaction. These interactions are ubiquitous and define the primary productivity in most ecosystems. In recent years, algae have received much attention for industrial exploitation but their interaction with bacteria is often considered a contamination during commercialization. A few recent studies have shown that bacteria not only enhance algal growth but also help in flocculation, both essential processes in algal biotechnology. Hence, there is a need to understand these interactions from an evolutionary and ecological standpoint, and integrate this understanding for industrial use. Here we reflect on the diversity of such relationships and their associated mechanisms, as well as the habitats that they mutually influence. This review also outlines the role of these interactions in key evolutionary events such as endosymbiosis, besides their ecological role in biogeochemical cycles. Finally, we focus on extending such studies on algal-bacterial interactions to various environmental and bio-technological applications. Copyright © 2015 The Authors. Published by Elsevier Inc. All rights reserved.

  1. Overcoming Microalgae Harvesting Barrier by Activated Algae Granules.

    Science.gov (United States)

    Tiron, Olga; Bumbac, Costel; Manea, Elena; Stefanescu, Mihai; Nita Lazar, Mihai

    2017-07-05

    The economic factor of the microalgae harvesting step acts as a barrier to scaling up microalgae-based technology designed for wastewater treatment. In view of that, this study presents an alternative microalgae-bacteria system, which is proposed for eliminating the economic obstacle. Instead of the microalgae-bacteria (activated algae) flocs, the study aimed to develop activated algae granules comprising the microalgae Chlorella sp. as a target species. The presence of the filamentous microalgae (Phormidium sp.) was necessary for the occurrence of the granulation processes. A progressive decrease in frequency of the free Chlorella sp. cells was achieved once with the development of the activated algae granules as a result of the target microalgae being captured in the dense and tangled network of filaments. The mature activated algae granules ranged between 600 and 2,000 µm, and were characterized by a compact structure and significant settling ability (21.6 ± 0.9 m/h). In relation to the main aim of this study, a microalgae recovery efficiency of higher than 99% was achieved only by fast sedimentation of the granules; this performance highlighted the viability of the granular activated algae system for sustaining a microalgae harvesting procedure with neither cost nor energy inputs.

  2. Development and characteristics of an adhesion bioassay for ectocarpoid algae.

    Science.gov (United States)

    Evariste, Emmanuelle; Gachon, Claire M M; Callow, Maureen E; Callow, James A

    2012-01-01

    Species of filamentous brown algae in the family Ectocarpaceae are significant members of fouling communities. However, there are few systematic studies on the influence of surface physico-chemical properties on their adhesion. In the present paper the development of a novel, laboratory-based adhesion bioassay for ectocarpoid algae, at an appropriate scale for the screening of sets of experimental samples in well-replicated and controlled experiments is described. The assays are based on the colonization of surfaces from a starting inoculum consisting of multicellular filaments obtained by blending the cultured alga Ectocarpus crouaniorum. The adhesion strength of the biomass after 14 days growth was assessed by applying a hydrodynamic shear stress. Results from adhesion tests on a set of standard surfaces showed that E. crouaniorum adhered more weakly to the amphiphilic Intersleek® 900 than to the more hydrophobic Intersleek® 700 and Silastic® T2 coatings. Adhesion to hydrophilic glass was also weak. Similar results were obtained for other cultivated species of Ectocarpus but differed from those obtained with the related ectocarpoid species Hincksia secunda. The response of the ectocarpoid algae to the surfaces was also compared to that for the green alga, Ulva.

  3. Algae Production from Wastewater Resources: An Engineering and Cost Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Schoenung, Susan [Longitude 122 West, Inc.; Efroymson, Rebecca Ann [ORNL

    2018-03-01

    Co-locating algae cultivation ponds near municipal wastewater (MWW) facilities provides the opportunity to make use of the nitrogen and phosphorus compounds in the wastewater as nutrient sources for the algae. This use benefits MWW facilities, the algae biomass and biofuel or bioproduct industry, and the users of streams where treated or untreated waste would be discharged. Nutrient compounds can lead to eutrophication, hypoxia, and adverse effects to some organisms if released downstream. This analysis presents an estimate of the cost savings made possible to cultivation facilities by using the nutrients from wastewater for algae growth rather than purchase of the nutrients. The analysis takes into consideration the cost of pipe transport from the wastewater facility to the algae ponds, a cost factor that has not been publicly documented in the past. The results show that the savings in nutrient costs can support a wastewater transport distance up to 10 miles for a 1000-acre-pond facility, with potential adjustments for different operating assumptions.

  4. Anti-phytopathogenic activities of macro-algae extracts.

    Science.gov (United States)

    Jiménez, Edra; Dorta, Fernando; Medina, Cristian; Ramírez, Alberto; Ramírez, Ingrid; Peña-Cortés, Hugo

    2011-01-01

    Aqueous and ethanolic extracts obtained from nine Chilean marine macro-algae collected at different seasons were examined in vitro and in vivo for properties that reduce the growth of plant pathogens or decrease the injury severity of plant foliar tissues following pathogen infection. Particular crude aqueous or organic extracts showed effects on the growth of pathogenic bacteria whereas others displayed important effects against pathogenic fungi or viruses, either by inhibiting fungal mycelia growth or by reducing the disease symptoms in leaves caused by pathogen challenge. Organic extracts obtained from the brown-alga Lessonia trabeculata inhibited bacterial growth and reduced both the number and size of the necrotic lesion in tomato leaves following infection with Botrytis cinerea. Aqueous and ethanolic extracts from the red-alga Gracillaria chilensis prevent the growth of Phytophthora cinnamomi, showing a response which depends on doses and collecting-time. Similarly, aqueous and ethanolic extracts from the brown-alga Durvillaea antarctica were able to diminish the damage caused by tobacco mosaic virus (TMV) in tobacco leaves, and the aqueous procedure is, in addition, more effective and seasonally independent. These results suggest that macro-algae contain compounds with different chemical properties which could be considered for controlling specific plant pathogens.

  5. Boron uptake, localization, and speciation in marine brown algae.

    Science.gov (United States)

    Miller, Eric P; Wu, Youxian; Carrano, Carl J

    2016-02-01

    In contrast to the generally boron-poor terrestrial environment, the concentration of boron in the marine environment is relatively high (0.4 mM) and while there has been extensive interest in its use as a surrogate of pH in paleoclimate studies in the context of climate change-related questions, the relatively depth independent, and the generally non-nutrient-like concentration profile of this element have led to boron being neglected as a potentially biologically relevant element in the ocean. Among the marine plant-like organisms the brown algae (Phaeophyta) are one of only five lineages of photosynthetic eukaryotes to have evolved complex multicellularity. Many of unusual and often unique features of brown algae are attributable to this singular evolutionary history. These adaptations are a reflection of the marine coastal environment which brown algae dominate in terms of biomass. Consequently, brown algae are of fundamental importance to oceanic ecology, geochemistry, and coastal industry. Our results indicate that boron is taken up by a facilitated diffusion mechanism against a considerable concentration gradient. Furthermore, in both Ectocarpus and Macrocystis some boron is most likely bound to cell wall constituent alginate and the photoassimilate mannitol located in sieve cells. Herein, we describe boron uptake, speciation, localization and possible biological function in two species of brown algae, Macrocystis pyrifera and Ectocarpus siliculosus.

  6. Anti-Phytopathogenic Activities of Macro-Algae Extracts

    Directory of Open Access Journals (Sweden)

    Ingrid Ramírez

    2011-05-01

    Full Text Available Aqueous and ethanolic extracts obtained from nine Chilean marine macro-algae collected at different seasons were examined in vitro and in vivo for properties that reduce the growth of plant pathogens or decrease the injury severity of plant foliar tissues following pathogen infection. Particular crude aqueous or organic extracts showed effects on the growth of pathogenic bacteria whereas others displayed important effects against pathogenic fungi or viruses, either by inhibiting fungal mycelia growth or by reducing the disease symptoms in leaves caused by pathogen challenge. Organic extracts obtained from the brown-alga Lessonia trabeculata inhibited bacterial growth and reduced both the number and size of the necrotic lesion in tomato leaves following infection with Botrytis cinerea. Aqueous and ethanolic extracts from the red-alga Gracillaria chilensis prevent the growth of Phytophthora cinnamomi, showing a response which depends on doses and collecting-time. Similarly, aqueous and ethanolic extracts from the brown-alga Durvillaea antarctica were able to diminish the damage caused by tobacco mosaic virus (TMV in tobacco leaves, and the aqueous procedure is, in addition, more effective and seasonally independent. These results suggest that macro-algae contain compounds with different chemical properties which could be considered for controlling specific plant pathogens.

  7. Evolution of reproductive development in the volvocine algae.

    Science.gov (United States)

    Hallmann, Armin

    2011-06-01

    The evolution of multicellularity, the separation of germline cells from sterile somatic cells, and the generation of a male-female dichotomy are certainly among the greatest innovations of eukaryotes. Remarkably, phylogenetic analysis suggests that the shift from simple to complex, differentiated multicellularity was not a unique progression in the evolution of life, but in fact a quite frequent event. The spheroidal green alga Volvox and its close relatives, the volvocine algae, span the full range of organizational complexity, from unicellular and colonial genera to multicellular genera with a full germ-soma division of labor and male-female dichotomy; thus, these algae are ideal model organisms for addressing fundamental issues related to the transition to multicellularity and for discovering universal rules that characterize this transition. Of all living species, Volvox carteri represents the simplest version of an immortal germline producing specialized somatic cells. This cellular specialization involved the emergence of mortality and the production of the first dead ancestors in the evolution of this lineage. Volvocine algae therefore exemplify the evolution of cellular cooperation from cellular autonomy. They also serve as a prime example of the evolution of complex traits by a few successive, small steps. Thus, we learn from volvocine algae that the evolutionary transition to complex, multicellular life is probably much easier to achieve than is commonly believed. © The Author(s) 2010. This article is published with open access at Springerlink.com

  8. Radionuclides in macro algae at Monaco following the Chernobyl accident

    International Nuclear Information System (INIS)

    Holm, E.; Ballestra, S.; Lopez, J.J.; Bulos, A.; Whitehead, N.E.; Barci-Funel, G.; Ardisson, G.

    1994-01-01

    Samples of macro algae, Codmium tomentosum (green), Corallina mediterranea (red), Sphaerococcus coronopifolius (red) and Dictyota dichotoma (brown), were collected off Monaco during 1984 and 1988 and analysed for gamma-emitting radionuclides and transuranium elements. Due to the Chernobyl accident, increased radioactivity in the atmosphere at Monaco was recorded on 30 April 1986 with maximal activity concentrations on 2-3 May. The maximal activity concentrations in sea water occurred on 5-6 May and in the algae on 11 May. The decrease of activity concentrations can be described after May 11 as a single exponential relationship, where elimination rates for different radionuclides and different species specific to the environment can be calculated. The elimination rates thus observed correspond to mean residence times between 70 and 370 days corrected for physical decay. The concentration factors were also estimated and the highest values were found for 131 I, 129 Te m , and 110 Ag m and lowest for radiocesium and 140 Ba. The red algae Sphaerococcus coronopifoius showed generally higher concentration factors than green and brown algae. Regarding transuranium elements, a theoretical contribution from the Chernobyl accident can be made but only 242 Cm was detected in the algae above previous levels before the accident, due to the relatively small fallout of transuranics. (author) 23 refs.; 9 figs.; 4 tabs

  9. Acute toxicity and associated mechanisms of four strobilurins in algae.

    Science.gov (United States)

    Liu, Xiaoxu; Wang, Yu; Chen, Hao; Zhang, Junli; Wang, Chengju; Li, Xuefeng; Pang, Sen

    2018-04-03

    Strobilurins have been reported highly toxic to non-target aquatic organisms but few illustrated how they cause toxic effects on algae. This study investigated the acute toxicity of Kresoxim-methy (KRE), Pyraclostrobin (PYR), Trifloxystrobin (TRI) and Picoxystrobin (PIC) on two algae and their toxicity mechanisms. Four strobilurins showed lower toxic effects on Chlorella pyrenoidsa but higher on Chlorella vulgaris. bc1 complex activities in C. vulgaris were significantly inhibited by all strobilurins, suggesting bc 1 complex might be the target of strobilurin toxicity in algae. Moreover, SOD, CAT and POD activities were significantly up-regulated by all doses of KRE, PYR and PIC. In contrast, low concentrations of TRI stimulated SOD and POD activities but highest concentration significantly inhibited those activities. Comet assays showed damaged DNA in C. vulgaris by four strobulirins, suggesting their potential genotoxic threats to algae. The results illustrated acute toxicity by strobulirins on algae and their possible toxicity mechanisms. Copyright © 2018 Elsevier B.V. All rights reserved.

  10. Sustainability of algae derived biodiesel: a mass balance approach.

    Science.gov (United States)

    Pfromm, Peter H; Amanor-Boadu, Vincent; Nelson, Richard

    2011-01-01

    A rigorous chemical engineering mass balance/unit operations approach is applied here to bio-diesel from algae mass culture. An equivalent of 50,000,000 gallons per year (0.006002 m3/s) of petroleum-based Number 2 fuel oil (US, diesel for compression-ignition engines, about 0.1% of annual US consumption) from oleaginous algae is the target. Methyl algaeate and ethyl algaeate diesel can according to this analysis conceptually be produced largely in a technologically sustainable way albeit at a lower available diesel yield. About 11 square miles of algae ponds would be needed with optimistic assumptions of 50 g biomass yield per day and m2 pond area. CO2 to foster algae growth should be supplied from a sustainable source such as a biomass-based ethanol production. Reliance on fossil-based CO2 from power plants or fertilizer production renders algae diesel non-sustainable in the long term. Copyright © 2010 Elsevier Ltd. All rights reserved.

  11. Visualization of oxygen distribution patterns caused by coral and algae.

    Science.gov (United States)

    Haas, Andreas F; Gregg, Allison K; Smith, Jennifer E; Abieri, Maria L; Hatay, Mark; Rohwer, Forest

    2013-01-01

    Planar optodes were used to visualize oxygen distribution patterns associated with a coral reef associated green algae (Chaetomorpha sp.) and a hermatypic coral (Favia sp.) separately, as standalone organisms, and placed in close proximity mimicking coral-algal interactions. Oxygen patterns were assessed in light and dark conditions and under varying flow regimes. The images show discrete high oxygen concentration regions above the organisms during lighted periods and low oxygen in the dark. Size and orientation of these areas were dependent on flow regime. For corals and algae in close proximity the 2D optodes show areas of extremely low oxygen concentration at the interaction interfaces under both dark (18.4 ± 7.7 µmol O2 L(- 1)) and daylight (97.9 ± 27.5 µmol O2 L(- 1)) conditions. These images present the first two-dimensional visualization of oxygen gradients generated by benthic reef algae and corals under varying flow conditions and provide a 2D depiction of previously observed hypoxic zones at coral algae interfaces. This approach allows for visualization of locally confined, distinctive alterations of oxygen concentrations facilitated by benthic organisms and provides compelling evidence for hypoxic conditions at coral-algae interaction zones.

  12. Visualization of oxygen distribution patterns caused by coral and algae

    Directory of Open Access Journals (Sweden)

    Andreas F. Haas

    2013-07-01

    Full Text Available Planar optodes were used to visualize oxygen distribution patterns associated with a coral reef associated green algae (Chaetomorpha sp. and a hermatypic coral (Favia sp. separately, as standalone organisms, and placed in close proximity mimicking coral-algal interactions. Oxygen patterns were assessed in light and dark conditions and under varying flow regimes. The images show discrete high oxygen concentration regions above the organisms during lighted periods and low oxygen in the dark. Size and orientation of these areas were dependent on flow regime. For corals and algae in close proximity the 2D optodes show areas of extremely low oxygen concentration at the interaction interfaces under both dark (18.4 ± 7.7 µmol O2 L- 1 and daylight (97.9 ± 27.5 µmol O2 L- 1 conditions. These images present the first two-dimensional visualization of oxygen gradients generated by benthic reef algae and corals under varying flow conditions and provide a 2D depiction of previously observed hypoxic zones at coral algae interfaces. This approach allows for visualization of locally confined, distinctive alterations of oxygen concentrations facilitated by benthic organisms and provides compelling evidence for hypoxic conditions at coral-algae interaction zones.

  13. El problema del control de la Tuberculosis en Colombia

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    Gilberto Rueda P.

    1979-10-01

    Full Text Available

    Bogotá, Noviembre de 1.978
    Señor Presidente de la Academia
    Doctor CésarAugusto Pantoja
    E. S. D.
    Señor Presidente:


    La Comisión con la cual Ud. ha tenido a bien honrarnos, ha analizado el problema del control de la Tuberculosis en Colombia en la siguiente forma:
    Resúmen: La TBC en Colombia como en todos, los países del tercer mundo constituye problema prioritario de salud pública.
    Los datos oficiales colombianos determinan 50.000 pacientes activos en tratamiento y 12.000 casos nuevos bacteriólogicamente diagnosticados por año.
    Se han denunciado numerosos casos de TBC exrrapulmonar no diagnosticables bacteriológicamente.
    La vacunación BCC, de acuerdo con cifras oficiales, cubre el 780/0 de la población infantil globalmente, pero solamente el 300/0 de los menores de 1 año y el 430/0 de los menores de 4 años, lo cual es claramente insuficiente.
    El descubrimiento de casos a base únicamente del recurso bacteriológico debe ser basado en una infraestructura humana y técnica prácticamente perfecta para que éste recurso cumpla un efecto que no sea contraproducente.
    El tratamiento utilizado en Colombia, recomendado por la OMS se hace a base de drogas bacteriostáticas de bajo costo, utilizadas por períodos prolongados que van de 1 año a 18 meses y que provocan un abandono del 230/0 según cifras oficiales.

    La Unión Internacional contra la Tuberculosis con la aquiescencia de la OMS ha estudiado esquemas modernos de tratamiento con las llamadas "drogas esenciales" bacteriolíticas que, en períodos breves (6 a 9 meses curan más del 950/0 de los pacientes. El Seminario Nacional de TBC (Bogotá - abril/78 recomendó la introducción de estas drogas para uso general en el país.
    Se hace un resumen de los principales esquemas recomendados.


  14. PERCEPCIÓN DEL MUNDO: MAPAS MENTALES Y PROBLEMAS SOCIOAMBIENTALES

    Directory of Open Access Journals (Sweden)

    Antonio José Morales Hernández

    Full Text Available Resumen:Las personas construyen su imagen del mundo en relación con relatos que oyen de familiares y amigos, de noticias que observan en los medios de comunicación de masas... También es relevante la influencia del medio escolar, en especial desde materias como la Geografía, que les presenta no sólo hechos y datos del mundo, sino también una representación del planeta en un mapa. En este artículo queremos ofrecer una experiencia empírica sobre la construcción mental del mapamundi por parte de alumnos de Magisterio de Valencia. Con ello queremos mostrar la necesidad de trabajar este contenido de habilidades cartográficas para evitar la deformación de la explicación del planeta Tierra y sus problemas. Palabras ClaveMapas mentales, percepción de los problemas sociambientales, educación en valores. AbstractPeople build their own image of the world in relation to stories they hear from family and friends, news that they observed in the mass media... It is also relevant the influence of school environment, especially from the subject of Geography, which not only presents facts of the world, it is also a representation of the planet on a map.In this paper we want to provide of an empirical experience of the mental construction of the world map made by students that will be primary teachers in Valencia. With all we explained, we want to show the need of working this contents of cartographic skills to prevent deformation of the explanation of planet Earth and its problems.Key WordsMind mapping, perception of socio-environmental issues, education in valuesRésuméLes personnes construissent leur image du monde en rapport avec les récits qu’ils écoutent à d’autres membres de la famille et les amis, les nouvelles qu’ils observent aux mass media... Il est aussi remarquable l’influence du moyen scolaire, spécialement depuis des matières comme la Géographie, qui ne présente que des faits et des renseignements sur le monde, mais

  15. Algoritmos multirecombinativos aplicados al problema de ruteo de vehículos

    Directory of Open Access Journals (Sweden)

    Renzo Ramon Miño

    2014-06-01

    Full Text Available El diseño de algoritmos eficientes para resolver problemas complejos ha sido tradicionalmente uno de los aspectos más importantes en la investigación en el campo de la informática. El objetivo perseguido en este campo es fundamentalmente el desarrollo de nuevos métodos capaces de resolver problemas complejos con el menor esfuerzo computacional posible, mejorando así a los algoritmos existentes. En consecuencia, esto no sólo permite afrontar los problemas de forma más eficiente, sino afrontar tareas vedadas en el pasado debido a su alto costo computacional. Las metaheurísticas son métodos que integran procedimientos de mejora local y estrategias de alto nivel para realizar una búsqueda robusta en el espacio-problema. El problema de ruteo de vehículos es un problema de optimización combinatoria de gran importancia en diferentes entornos logísticos debido a su dificultad (NP-duros y a sus múltiples aplicaciones industriales. Se han propuestos varias soluciones a este problema haciendo uso de heurísticas y metaheurísticas. En este trabajo proponemos dos algoritmos para resolver el problema de ruteo de vehículos con capacidad limitada, utilizando como base un Algoritmo Evolutivo conocido como MCMP-SRI (Stud and Random Inmigrants combinados con Hill- Climbing. Detalles de los algoritmos y los resultados de los experimentos muestran un promisorio comportamiento para resolver el problema.

  16. O problema do suicídio em Montaigne

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    Lúcio Vaz

    2012-12-01

    Full Text Available Nos Ensaios de Montaigne, encontramos um dos mais célebres textos filosóficos sobre a morte voluntária, o capítulo 3 do livro II. Muitos comentadores qualificam o posicionamento de Montaigne como sendo o mesmo de Sêneca e de alguns autores antigos, qual seja, uma defesa da moralidade do ato de se matar. Outros estudiosos detectam no ensaio uma oscilação inconclusa do autor francês sobre o tema. Procuro, em contrapartida, apresentar argumentos que evidenciam que a opinião final de Montaigne é irrestritamente contrária ao suicídio. Para tanto, é feito um mapeamento das várias ocorrências do problema do suicídio no livro que vão além do citado capítulo. Além disso, é ressaltada a distinção entre as camadas de escrita do texto em suas várias edições, contrapondo as inovações de Montaigne aos modelos argumentativos de suas influências clássicas.In Montaigne's Essays, we find one of the most famous philosophical texts on voluntary death, the third chapter of Book II. Many commentators assess Montaigne's position as similar to Seneca's and to some other ancient authors', that is, a defense of the morality of killing oneself. Other scholars detect an unsolved oscillation of the French author on the subject. However, I try to present arguments showing that Montaigne's final opinion is against suicide. Therefore, it is undertaken a mapping of the multiple occurrences of the issue in the book, which go beyond the said chapter. Moreover, the distinction between the writing layers of the Essais in its various editions is stressed, putting in contrast the novelty of Montaigne's argumentative models to his classical influences.

  17. La creación del problema (1900-1929

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    ANTONIO ESCOHOTADO

    1986-01-01

    Full Text Available Investigación sobre los orígenes a comienzos del siglo veinte de la problemática moderna de las drogas en Estados Unidos, apoyados en documentos contemporáneos, que incluyen informes del gobierno y artículos de periódicos y revistas médicas. Se describe la temprana producción y distribución de sustancias psicoactivas descubiertas en el siglo diecinueve (principalmente morfina, heroína, cocaína y barbitúricos. Entre los aspectos discutidos se incluyen: factores económicos; el rol de la profesión médica; la opinión pública, la cual se encuentra influenciada por la identificación del uso de drogas con las minorías étnicas; relaciones internacionales con naciones productoras de drogas, p.e., Filipinas y China; y la legislación referente a su restricción. Se muestra como una cruzada de moral puritana, dominada por unos cuantos individuos en posiciones dominantes, llevó a políticas represivas y falta de entendimiento del toxicómano, que ha contribuido enormemente a hacer del uso de drogas el problema social más importante de nuestros días. Caben los paralelismos con el período de la prohibición del alcohol. La demanda creciente de ayuda psicológica en las sociedades modernas también es objeto de discusión.

  18. Historiografía comparada: problemas y perspectivas

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    Chris Lorenz

    2005-12-01

    Full Text Available In this text contributions related are abridged - direct or indirectly - with the historiography of world war two. The comparative historiography is placed as a gender related to a typology that classified historiography theories over an extended sequence from the general and philosophical to the particular and empirical. Resides, it also places the recent debates on the “fragmentation " of the historiography in a comparative perspective. Due that historiography is the history of the written history -and therefore a reconstruction of reconstructions- we find the problem of comparison in historiography twice. The historiographer is not alone confronting with relative comparative judgments of the historic reconstructions themselves but also related to the historiography reconstructions of those historic reconstructions.//En este texto se compendian contribuciones relacionadas - directa o indirectamente - con la historiografía de la segunda guerra mundial. Se ubica a la historiografía comparada como un género en relación a una tipología que clasifica teorías de historiografía sobre una secuencia extendida de lo general y filosófico a lo particular y empírico. Además, coloca los recientes debates sobre la "fragmentación" de la historiografía en una perspectiva comparada. Debido a que la historiografía es la historia de la historia escrita - y por lo tanto una reconstrucción de reconstrucciones - encontramos el problema de la comparación en historiografía dos veces. El historiógrafo no sólo está confrontado con los juicios comparados relativos a las reconstrucciones históricas mismas, sino también relativas a las reconstrucciones historiográficas de aquellas reconstrucciones históricas.

  19. Problema de la agencia y la cultura corporativa estalinista

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    Yurí Gorbaneff

    2004-12-01

    Full Text Available El problema de la agencia es de los obstáculos para la eficiencia de las organizaciones. A partir de Alchian y Demsetz (1972.la teoría sugiere dos soluciones: la propiedad privada y la cultura corporativa. Sin embargo, aislar el efecto de la cultura sobre las organizaciones no es fácil. La "ingeniería social" estalinista ofrece un material interesante para evaluar los efectos de la cultura corporativa sobre el sistema económico. Acá se sostiene la hipótesis de que los dirigentes soviéticos, al enfrentar los crecientes costos de la agencia tuvieron que inventar otra método, que no fuera la propiedad privada ni el control democrático directo sobre el aparato productivo, para controlar la pérdida de la agencia. Ellos recurrieron a la implantación de la cultura corporativa heroica a nivel nacional. Este trabajo muestra que la propaganda política, el arte, la literatura, los movimientos populares y el culto a la personalidad de Stalin fueran las herramientas gerenciales clave para implantar la cultura corporativa heroica, indispensable en la economía planificada. Su aplicación fue exitosa y generó las condiciones necesarias para la industrialización entre 1920 y 1930 y para el alto desempeño de la economía soviética durante la Segunda Guerra Mundial. La segunda hipótesis consiste en que el fantasma de la agencia, ahuyentado entre 1920 y 1950 por la cultura heroica estalinista, terminó devorando la economía planificada.

  20. ANTROPOLOGIA EN LA EMPRESA: ESTRATEGIAS Y PROBLEMAS EN LA INTERVENCION

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    Esteban Ruiz Ballesteros

    2003-08-01

    Full Text Available Entre 1995 y 1 998, el autor ha formado parte del organigrama de una empresa minera implementando diferentes proyectos de intervención como asesor-investigador. La conformación de dicha empresa a mediados de 1995 como sociedad laboral (propiedad de sus trabajadores demandaba un profundo cambio cultural. En concreto, la organización como tal precisaba una remodelación no tanto de la propia estructura de la plantilla, sino más bien de las percepciones y representaciones de lo socio laboral y de las actitudes en tomo al trabajo. En definitiva la plantilla tenía que empezar a ver las mismas cosas de otra manera. Este documento profundiza en los problemas y diferentes estrategias que han surgido después de tres años de trabajo continuado, cuestiones en definitiva que probablemente sean extrapolables a otras experiencias antropológicas más allá de la academia. Y no sólo porque el contexto de la intervención sea una empresa, sino también porque esta forma parte de la Economía Social y contribuye al desarrollo endógeno de una zona sumida en una profunda crisis socioeconómica desde los años ochenta. Se trata, por tanto, de una intervención antropológica en relación al sector privado y al desarrollo local.

  1. A juventude da periferia na escola: o que é problema?

    Directory of Open Access Journals (Sweden)

    Michele Lopes Leguiça

    2016-12-01

    Full Text Available Este artigo objetivou problematizar a noção de “aluna/o-problema”, inicialmente definida por critérios como baixo rendimento escolar, indisciplina, recuperação paralela, com vistas a compreender como tal noção é apropriada e resignificada pelos diferentes sujeitos da comunidade escolar e como opera na construção de identidades das/os estudantes Para tanto, utilizou-se a metodologia de pesquisa qualitativa, a partir da abordagem de Estudo de Caso, entre estudantes do 7º ano de uma Escola Municipal de um bairro periférico da cidade de Uruguaiana/RS. Concluiu-se que a noção de “aluna/o- problema” guarda uma complexidade de sentidos e aponta para o encontro entre universos simbólicos e visões de mundo distintos no espaço escolar, constituídos por marcadores sociais da diferença que se interseccionam, tais como gênero, raça, classe. Ao descortinar esses significados implícitos, esta pesquisa buscou contribuir para o repensar das alteridades no contexto escolar e das relações de ensinagem e aprendizagem. Levando-se em conta que a construção das identidades sociais é um processo relacional, dinâmico e transitório, foi relevante problematizar os diferentes significados atribuídos à noção de problema, de forma a produzir conhecimento sobre essa realidade e, assim, contribuir para a sua transformação.

  2. O conceito hegeliano de "fenomenologia" e o problema do ceticismo

    Directory of Open Access Journals (Sweden)

    Bonaccini, Juan Adolfo

    2006-01-01

    Full Text Available A relação de Hegel com o ceticismo está longe de ser clara. A par de existirem alguns poucos trabalhos sobre o assunto, e de Hegel abordar o tema em várias obras, não está bem determinado se Hegel possui uma teoria global sobre o ceticismo ou se apenas é um mero crítico de posturas céticas clássicas na antigüidade e na modernidade. Em que pese Hegel ser um crítico ferrenho do ceticismo moderno (por ex. , em textos como Sobre a relação do Ceticismo com a Filosofia, as Preleções sobre História da Filosofia e a Enciclopédia das Ciências Filosóficas, a sua crítica não se restringe a esta ou aquela forma de ceticismo, mas se funda numa teoria geral do saber que compreende o ceticismo como uma atividade negativa constitutiva da consciência e pretende refutá-lo enquanto ele reifica essa negatividade numa pretensão de verdade. A refutação consiste na descrição do modo como o ceticismo filosófico seria um saber parcial, e por isso auto-refutativo. O presente trabalho pretende sugerir que isto ocorre, sobretudo, na Fenomenologia do Espírito, cujo caráter "fenomenológico" propriamente dito não parece poder ser bem compreendido, sem tomar como pano de fundo o problema do ceticismo

  3. Donar: ¿Un problema bioético?

    Directory of Open Access Journals (Sweden)

    Ángel Alonso Salas

    2017-06-01

    Full Text Available El filósofo australiano, Peter Singer escribió un texto que se titula Salvar una vida. Cómo terminar con la pobreza que hace referencia a los motivos que se tienen para que las personas efectúen donaciones y el deber que el ser humano tiene para ayudar a los más necesitados. En este sentido, el presente texto tiene como finalidad, preguntarse acerca del problema bioético que supone el que un sujeto o una institución otorguen algún tipo de donación, bajo el supuesto de ¿cuáles son los motivos éticos que a manera de imperativo categórico subyacen en el donativo? ¿Por qué ante la abismal brecha entre ricos y pobres el donativo se convierte en un paliativo de equidad social? Y ¿cuáles son las desgracias o hechos que obligan a compartir lo poco o mucho que se tiene? Para lograr esto, el texto se dividirá en dos partes, en primer lugar el presentar algunas objeciones que Singer tendría hacia la “Cruzada Nacional contra el Hambre” que se ha impuesto como meta el Gobierno Federal en México en el presente sexenio y, en segundo lugar, lo acontecido hace algunos meses en territorio nacional con la ayuda que miles de personas brindaron a los daminificados por el huracán Ingrid y la tormenta tropical Manuel, en septiembre del 2013, en especial, brindando su solidaridad al pueblo de Guerrero.

  4. La violencia familiar, ¿un problema de salud?

    Directory of Open Access Journals (Sweden)

    Mario C. Muñiz Ferrer

    1998-12-01

    Full Text Available Con el objetivo de profundizar en el estudio de la violencia intrafamiliar y para su mejor conocimiento y enfrentamiento en el área de salud, se realiza un estudio descriptivo de los resultados obtenidos al aplicar el test proyectivo "Lo que no me gusta en mi familia" y una entrevista a 147 niños de 5to. y 6to. grados de la Escuela "Roberto Poland" del Reparto "Antonio Maceo", del municipio Cerro; donde se clasifican las variedades de violencia intrafamiliar y se agrupan éstas por orden de frecuencia. También se calcula la prevalencia de violencia intrafamiliar y se explora la posible relación de la violencia con la ingestión de bebidas alcohólicas. Los resultados obtenidos permiten plantear que la violencia intrafamiliar constituye un problema de salud y que existe relación entre ésta y el consumo de alcoholIn order to deepen into the study of intrafamily violence and to know it and face it better in the health area, it was conducted a descriptive study of the results obtained through the application of a projective test called «What I don’t like about my family» and an interview made to 147 5th and 6th grade children from the «Robert Poland» School in the «Antonio Maceo» District, Cerro municipality. The variaties of intrafamily violence were classified and grouped according to frequency. The prevalence of intrafamily violence was also calculated and the possible relationship existing between violence and the ingestion of alcoholic beverages was explored. According to the results it was concluded that intrafamily violence is a health problem and that it is associated with drinking

  5. El problema social del sida en España

    Directory of Open Access Journals (Sweden)

    JESÚS M. DE MIGUEL

    1991-01-01

    Full Text Available A principios de la década de los noventa, España tiene ya más de siete mil casos de sida, convirtiéndose en el tercer país de Europa con más casos. En la década pasa luego a ser el segundo país europeo. La peculiaridad española es que la mayoría de los casos son drogadictos/as que se inyectan heroína, y no tanto homosexuales. Hay también más casos de mujeres y niños/as que en otros países. Se observa una asociación entre sida y desarrollo: los casos se concentran en las zonas más desarrolladas (País Vasco, Cataluña, Madrid, aunque ataca a personas marginadas. Dado que actualmente no existe cura (ni vacuna, la lucha contra el sida se centra en medidas de prevención, análisis epidemiológico, y estudio de los factores sociales. El análisis sociológico del sida es, pues, imprescindible. El presente artículo define las variables básicas, ofrece un análisis de los datos conocidos durante la primera década (de los ochenta, señala los problemas sociales creados por el sida, y formula las cuestiones que son importantes desde la Sociología.

  6. Postura corporal: um problema que aflige os trabalhadores

    Directory of Open Access Journals (Sweden)

    Mariângela Gagliardi Caro Salve

    Full Text Available Este artigo aborda primeiramente, aspectos e entendimento dos autores referentes às definições de postura corporal, os mecanismos responsáveis pela sua manutenção, qual é a postura considerada adequada ou inadequada, os distúrbios e medidas de prevenção. Concluímos que a postura, é um sistema altamente complexo e varia de indivíduo para indivíduo. E a manifestação corporal do ser humano no meio em que vive. Nela está implicada a personalidade, a maneira de posicionar-se diante das diversas situações, reflete a trajetória de vida e é o resultado de vários sistemas que atuam no organismo. Diante dos diferentes estímulos, os indivíduos podem adotar uma postura adequada ou inadequada. Na postura inadequada observa-se um desarranjo em vários elementos internos e externos ao corpo, causando em certos casos, dores e desconfortos. Quando ocorre algum desequilíbrio nos componentes da postura, surgem as alterações, doenças e desvios do eixo corporal. Para prevenir problemas posturais é necessário que se pense nos seguintes fatores: ambiente, mobiliários, espaço e tipo de trabalho, pausas, equipamentos e ferramentas, devem ser respeitadas as características biomecânicas do indivíduo, contribuindo para a sua qualidade de vida.

  7. Estrategias de comunicación política de los partidos emergentes: debates electorales previos a las elecciones del 20 de diciembre de 2015

    OpenAIRE

    Lancharro Montiel, Manuel Ignacio

    2016-01-01

    La campaña electoral de las elecciones generales del 20 de diciembre de 2015 ha supuesto la repolitización de la esfera pública española. La entrada en escena de dos partidos, Podemos y Ciudadanos, ha desencadenado un interés y una mediatización por la política que no existía desde los años de la Transición. Ambas formaciones emergentes han centrado su ascenso social en el impacto televisivo, de ahí que la campaña del 20D se jugara, sobre todo, en el plató de televisión. Uniendo los conce...

  8. Transformações globais, potências emergentes e Cooperação Sul-Sul: desafios para a cooperação europeia

    OpenAIRE

    Pino, Bruno Ayllón

    2012-01-01

    A União Europeia (UE) e seus Estados Membros enfrentam o desafio de adaptar sua política de cooperação para o desenvolvimento a um mundo marcado por rápidas mudanças na criação e distribuição da riqueza e na difusão do poder. A ascensão dos países emergentes, o auge da Cooperação Sul-Sul (CSS), os avanços na luta contra a pobreza em Países de Renda Média (PRM), ou o impacto traumático da crise nos países da Organização para a Cooperação e o Desenvolvimento Econômico (OCDE), são fatores que or...

  9. Escherichia coli O157:H7- patógeno alimentar emergente / Escherichia coli O157:H7 - emerging food pathogen

    OpenAIRE

    Cheila Minéia Daniel de Paula; Letícia Sopenã Casarin; Eduardo Cesar Tondo

    2014-01-01

    Segundo a Organização Mundial da Saúde, cerca de 2,2 milhões de pessoas morrem anualmente em função de doenças hídricas ou alimentares, a maioria dos quais são crianças. Estas doenças são causadas por patógenos já conhecidos, emergentes ou reemergentes, principalmente bactérias. A globalização tem contribuído na disseminação de patógenos de origem alimentar, aumentando o desafio relacionado à identificação da origem desses agentes e à elaboração de regulamentação e fiscalização adequadas. O c...

  10. Convergência e transmídia: galáxias semânticas e narrativas emergentes em jornalismo

    Directory of Open Access Journals (Sweden)

    Geane Alzamora

    2012-06-01

    Full Text Available Este artigo procura discutir as possibilidades de aplicação no Jornalismo do conceito de narrativa transmidiática, proposto por Henry Jenkins (2003 no âmbito das narrativas ficcionais. Aborda inicialmente as definições de Transmedia Storytelling, investiga as diferenças conceituais entre convergência e transmídia e propõe uma abordagem própria do conceito de transmídia no universo jornalístico, fundada na perspectiva do conhecimento produzido em dimensão transmidiática e nas especificidades informacionais dos formatos. Conclui com uma exploração inicial de exemplos de narrativas emergentes no contexto do jornalismo transmidiático, como o Jornalismo de Imersão e os newsgames, sugerindo que o experimentalismo seja um aspecto marcante da narrativa transmídia.

  11. Una metaheurística co-evolutiva para el problema del viajante de comercio

    OpenAIRE

    Holstein, Diana

    1998-01-01

    En este Trabajo de Grado se presenta una estrategia general (metaheurística) para la resolución del Problema del Viajante de Comercio. Éste es un problema clásico de optimización combinatoria, cuyo conjunto de soluciones posibles es finito, pero demasiado numeroso para ser manejado en forma directa. Dado un conjunto de ciudades, y una medida de “costo” entre ellas, el problema consiste en hallar un camino cerrado (tour) de costo mínimo, que visite cada ciudad exactamente una vez. El cos...

  12. Optimización combinatoria, algoritmos, aeronáutica, problemas

    OpenAIRE

    Roldan Martínez, David

    2016-01-01

    Este trabajo trata de reunir problemas de optimización combinatoria en el ámbito de la gestión aeronáutica, así como describir distintas soluciones que se han propuesto para resolverlos. Se recogen seis problemas distintos y se ofrece una pequeña explicación de las soluciones encontradas, proporcionando referencias al trabajo original. Aquest treball tracta de reunir problemas d'optimització combinatoria de l'àmbit de la gestió aeronáutica i de trovar diferents solucions que s'han proposat...

  13. Problemas Emocionales y Comportamentales en Niños Adoptados y No Adoptados

    OpenAIRE

    Yolanda Sánchez-Sandoval; Jesús Palacios

    2012-01-01

    El objetivo de este trabajo es conocer si niños y niñas adoptados manifiestan problemas emocionales y comportamentales en distinta medida que sus iguales no adoptados. Se analiza la manifestación de problemas, según la versión del profesorado, en un total de 569 chicos y chicas de entre 7 y 16 años de edad. Se establecen tres grupos de comparación de niños no adoptados. Los resultados muestran que los adoptados manifiestan, como media, más problemas que sus actuales compañeros ...

  14. El problema en la investigación científica

    OpenAIRE

    Barriga Hernández, Carlos; Universidad Nacional Mayor de San Marcos Facultad de Educación

    2014-01-01

    Yo he escogido el tema del problema, porque considero que es importante y que no ha sido lo suficientemente tratado, excepto cuando Mario Bunge tiene en su libro de Investigación Científica dos capítulos dedicados al Problema. Pero no ha sido suficientemente estudiado lo referente al Problema y cuando uno se pone a analizarlo descubre que es un concepto muy rico, es un concepto del cual se puede derivar muchas cosas no solamente en cuestiones teóricas -epistemológicas, sino cuestiones práctic...

  15. Proceso metodológico para seleccionar el problema de investigación

    OpenAIRE

    Torres Bardales, Coloníbol

    2014-01-01

    En la teoría de la investigación, no existe un proceso metodológico para seleccionar el problema de investigación, vacío que hemos cubierto con el trabajo, denominado: "PROCESO METODOLÓGICO PARA SELECCIONAR EL PROBLEMA DE INVESTIGACIÓN", cuyo principal objetivo es diseñar un proceso metodológico para seleccionar el problema de investigación, el que fue logrado aplicando los métodos: exegético, comparativo, histórico, inductivo y deductivo. Asimismo, la metodología aplicada permitió generar te...

  16. Problemas em grafos com poucos P4's em grafos indiferença

    OpenAIRE

    Vagner Pedrotti

    2011-01-01

    Resumo: Nesta tese de doutoramento sáo considerados três problemas em grafos, para os quais sáo obtidos resultados quando a entrada é restrita a algumas classes. Todos os problemas sáo problemas de otimização combinatória sobre grafos simples e apresentam diferentes classificações de complexidade. Em dois casos, o estudo focou classes de grafos com "poucos iYs" e ° uso da decomposição modular. No último caso, considerou-se uma subclasse dos grafos de intervalos e a aplicação de uma técnica co...

  17. Ontem, hoje e amanhã: sobre a web e as ferramentas colaborativas emergentes para o professor de língua estrangeira

    Directory of Open Access Journals (Sweden)

    Alan Ricardo Costa

    2016-12-01

    Full Text Available Considerando que “[...] só é possível prever o futuro quando se olha para o passado” (LEFFA, 2012, p.404, se faz necessário investigar o passado e o presente da web, das Tecnologias de Informação e Comunicação (TIC e das tecnologias educacionais para o ensino e a aprendizagem de Línguas Estrangeira (LE, para especular sobre o futuro, por mais incerto que este seja. Assim, o objetivo deste trabalho é apresentar e discutir as mudanças nas TIC e ferramentas educacionais, do passado para o presente, para apontar perspectivas emergentes ao alcance do professor de LE. Os resultados - que partem de observações sobre alguns recursos e ferramentas digitais disponíveis no Repositório Acción E/LE (Espanhol como Língua Estrangeira - indicam que: (1 recursos online e TIC em geral não tendem a negar o antigo, mas sim incorporá-lo ao novo, fazendo com que tais recursos estejam em contínua evolução; (2 esta evolução, consequentemente, acontece de forma gradual e complexa: nem todas as TIC e tecnologias educacionais mudam ao mesmo tempo ou na mesma medida; (3 a tendência mais visível e emergente é, possivelmente, a colaboração em massa subjacente às ferramentas e seus usos, o que explica o surgimento dos Recursos Educacionais Abertos (REA, por exemplo.

  18. QR académico: una propuesta didáctica emergente con apropiación de la cultura juvenil

    Directory of Open Access Journals (Sweden)

    Flora Arteaga Bustos

    2016-08-01

    Full Text Available Presentar una propuesta didáctica emergente para el uso del celular dentro del aula mediante la utilización de códigos QR (quick response- respuesta rápida- rige el objetivo del artículo. Se basa en la sistematización de teorías previas, identificadas en la búsqueda por difundir las nuevas estrategias educativas tecnológicas que se desarrollan en el ámbito venezolano. Su fundamentación se basa en la promoción de competencias digitales cónsonas a la cultura juvenil, la mejora de la calidad educativa y la optimización del desempeño estudiantil, aspectos fundamentales de las metas educativas de la CEPAL, de la OEI y de la UNESCO. El método utilizado es cuali-cuantitativo, para la técnica se diseñó una entrevista realizada al docente y un cuestionario dirigido a 20 de sus estudiantes. Los resultados indican mayor motivación e interés de los alumnos por la lectura y la investigación, así como un notable desarrollo del trabajo cooperativo-participativo. Se considera el establecer una mayor apropiación de las actividades en el aula consolidando la cultura juvenil, por lo que se demuestra el potencial de los códigos QR como herramienta educativa emergente. Como obstáculo evidenciado con el uso de la aplicación se menciona la deficiente interconectividad a la Internet. Se recomiendan procesos de difusión sobre nuevas experiencias docentes, como propuestas significativas de transposición didáctica tecnológica.

  19. Las TIC en educación: metaanálisis sobre investigación y líneas emergentes en México

    Directory of Open Access Journals (Sweden)

    Karen Michelle Olivares Carmona

    2016-10-01

    Full Text Available El estudio que aquí presentamos tiene el objetivo de comentar, analizar y categorizar de manera descriptiva las líneas de generación y aplicación del conocimiento (LGAC de diversos productos de investigación científica relacionados con la integración de las tecnologías de la información y la comunicación (TIC al proceso educativo en México. Los objetivos específicos consisten en identificar la población a la que se orientan las investigaciones; comparar los tipos de población con mayor y menor número de investigaciones; comparar las LGAC que cuentan con más y menos estudios; y reconocer líneas emergentes de investigación. La metodología consideró criterios de inclusión para seleccionar repositorios y tipos de documentos a analizar (se eligieron 470 documentos; también se precisaron las LGAC sobre las cuales realizamos el análisis. Entre los resultados, encontramos que los niveles educativos con mayor y menor número de investigaciones son la educación superior y el preescolar, respectivamente. Los principales vacíos de conocimiento se localizaron en áreas de gestión y calidad de programas educativos y de políticas educativas en relación con las TIC. Las líneas emergentes de investigación estuvieron vinculadas a la educación de adultos tardíos, población indígena y estudiantes con necesidades educativas especiales.

  20. Algae from the arid southwestern United States: an annotated bibliography

    Energy Technology Data Exchange (ETDEWEB)

    Thomas, W.H.; Gaines, S.R.

    1983-06-01

    Desert algae are attractive biomass producers for capturing solar energy through photosynthesis of organic matter. They are probably capable of higher yields and efficiencies of light utilization than higher plants, and are already adapted to extremes of sunlight intensity, salinity and temperature such as are found in the desert. This report consists of an annotated bibliography of the literature on algae from the arid southwestern United States. It was prepared in anticipation of efforts to isolate desert algae and study their yields in the laboratory. These steps are necessary prior to setting up outdoor algal culture ponds. Desert areas are attractive for such applications because land, sunlight, and, to some extent, water resources are abundant there. References are sorted by state.

  1. Effects of Harmful Algae on the Physiology of Fishes

    DEFF Research Database (Denmark)

    Svendsen, Morten Bo Søndergaard

    Blooms of harmful planktonic algae causing adverse effects in aquatic environments are a global problem, causing both human morbidity and killing aquatic lifeforms worldwide. Focusing on fish kills, it is largely unknown what mechanisms of the fish’s physiology are affected during exposure......-waters having enough oxygen to sustain life, but not too warm like the surface water layer. The proposed adverse pathway, being gill destruction, for fish exposed to Alexandrium monilatum suggests that co-occurring events of Alexandrium monilatum and oxygen squeeze events will tighten the oxygen limitation...... is largely caused by the fish and to a lesser extent the experimental setup. Before this thesis, systematic studies of fish physiology under the influence of harmful algae consisted of one algae species, Chattonella marina. Now there are a total of 4 species studied. Lastly, during the Ph...

  2. Designer proton-channel transgenic algae for photobiological hydrogen production

    Science.gov (United States)

    Lee, James Weifu [Knoxville, TN

    2011-04-26

    A designer proton-channel transgenic alga for photobiological hydrogen production that is specifically designed for production of molecular hydrogen (H.sub.2) through photosynthetic water splitting. The designer transgenic alga includes proton-conductive channels that are expressed to produce such uncoupler proteins in an amount sufficient to increase the algal H.sub.2 productivity. In one embodiment the designer proton-channel transgene is a nucleic acid construct (300) including a PCR forward primer (302), an externally inducible promoter (304), a transit targeting sequence (306), a designer proton-channel encoding sequence (308), a transcription and translation terminator (310), and a PCR reverse primer (312). In various embodiments, the designer proton-channel transgenic algae are used with a gas-separation system (500) and a gas-products-separation and utilization system (600) for photobiological H.sub.2 production.

  3. Sex pheromone of marine algae; Kaiso no sei pheromone

    Energy Technology Data Exchange (ETDEWEB)

    Kajiwara, T. [Yamaguchi University, Yamaguchi (Japan). Faculty of Agriculture

    1997-10-20

    The marine ecosystem skillfully uses various `odor materials` as chemical signals. In particular, this `odor materials` are indispensable for various organisms with no motor function or poor underdeveloped visual sensation in order to maintain or expand their species. German algae scholars found a male gamete induction active material secreted from a female gamete of primitive brown algae in 1971. Eleven kinds of sex pheromones have been found from brown algae up to the present since 1971. All of these found sex pheromones are hydrophobic `odor materials` composed of hydrocarbons containing 8 or 11 carbon atoms or epoxide (oxirane), and are compounds with singular chemical structures as physiological active material in the hydrosphere. Some sex pheromones govern not only inducement of spermatozoons but also discharge of spermatozoons from an antheridium. The sex pheromone with both functions of discharge and inducement was found from the culture solution of a certain tangle weed. 2 refs., 2 figs.

  4. Characteristics of Red Algae Bioplastics/Latex Blends under Tension

    Directory of Open Access Journals (Sweden)

    M. Nizar Machmud

    2013-10-01

    Full Text Available Cassava, corn, sago and the other food crops have been commonly used as raw materials to produce green plastics. However, plastics produced from such crops cannot be tailored to fit a particular requirement due to their poor water resistance and mechanical properties. Nowadays, researchers are hence looking to get alternative raw materials from the other sustainable resources to produce plastics. Their recent published studies have reported that marine red algae, that has been already widely used as a raw material for producing biofuels, is one of the potential algae crops that can be turned into plastics. In this work, Eucheuma Cottonii, that is one of the red alga crops, was used as raw material to produce plastics by using a filtration technique. Selected latex of Artocarpus altilis and Calostropis gigantea was separately then blended with bioplastics derived from the red algae, to replace use of glycerol as plasticizer. Role of the glycerol and the selected latex on physical and mechanical properties of the red algae bioplastics obtained under a tensile test performed at room temperature are discussed. Tensile strength of some starch-based plastics collected from some recent references is also presented in this paperDoi: 10.12777/ijse.5.2.81-88 [How to cite this article: Machmud, M.N., Fahmi, R.,  Abdullah, R., and Kokarkin, C.  (2013. Characteristics of Red Algae Bioplastics/Latex Blends under Tension. International Journal of Science and Engineering, 5(2,81-88. Doi: 10.12777/ijse.5.2.81-88

  5. Inorganic carbon addition stimulates snow algae primary productivity

    Science.gov (United States)

    Hamilton, T. L.; Havig, J. R.

    2017-12-01

    Earth has experienced glacial/interglacial oscillations throughout its history. Today over 15 million square kilometers (5.8 million square miles) of Earth's land surface is covered in ice including glaciers, ice caps, and the ice sheets of Greenland and Antarctica, most of which are retreating as a consequence of increased atmospheric CO2. Glaciers are teeming with life and supraglacial snow and ice surfaces are often red due to blooms of photoautotrophic algae. Recent evidence suggests the red pigmentation, secondary carotenoids produced in part to thrive under high irradiation, lowers albedo and accelerates melt. However, there are relatively few studies that report the productivity of snow algae communities and the parameters that constrain their growth on snow and ice surfaces. Here, we demonstrate that snow algae primary productivity can be stimulated by the addition of inorganic carbon. We found an increase in light-dependent carbon assimilation in snow algae microcosms amended with increasing amounts of inorganic carbon. Our snow algae communities were dominated by typical cosmopolitan snow algae species recovered from Alpine and Arctic environments. The climate feedbacks necessary to enter and exit glacial/interglacial oscillations are poorly understood. Evidence and models agree that global Snowball events are accompanied by changes in atmospheric CO2 with increasing CO2 necessary for entering periods of interglacial time. Our results demonstrate a positive feedback between increased CO2 and snow algal productivity and presumably growth. With the recent call for bio-albedo effects to be considered in climate models, our results underscore the need for robust climate models to include feedbacks between supraglacial primary productivity, albedo, and atmospheric CO2.

  6. Using the marine unicellular algae in biological monitoring

    Directory of Open Access Journals (Sweden)

    Kapkov V. I.

    2017-06-01

    Full Text Available The possibility of using marine unicellular algae from natural plankton community in biomonitoring of pollution by heavy metals has been investigated. Algae of different taxa from the Mediterranean Sea have been allocated to culture. In the laboratory the culture conditions – i. e. growth medium, temperature, photoperiod, level of artificial light and initial density – have been selected for every species. The impact of heavy metals (Hg, Cd, Cu, Pb in the form of chloride salts on the growth of axenic algae culture has been studied in the modelling experiments. The unicellular marine algae have a very short life cycle, therefore it is possible to use them in the experiments of studying the effect of anthropogenic factors at cellular and population levels on the test-object. With biomonitoring pollution of marine environment by heavy metals and others dangerous toxicants, the major indicators of algae community condition are the cellular cycle and the condition of the photosynthetic apparatus of the cell. The subsequent lysis of cells under the influence of heavy metals leads to the excretion of secondary metabolites which can essentially affect the metal toxicity. The established scales of threshold and lethal concentration of heavy metals for algae of different taxon make it possible to use the ratio of sensitive and resistant species to heavy metals as biological markers when forecasting ecological consequences of pollution of the marine environment by heavy metals. Distinctions in the resistance of different taxon to heavy metals can result in implementing the strategy of selection of test-objects depending on the purposes of the research.

  7. Floating Algae Blooms in the East China Sea

    Science.gov (United States)

    Qi, Lin; Hu, Chuanmin; Wang, Mengqiu; Shang, Shaoling; Wilson, Cara

    2017-11-01

    A floating algae bloom in the East China Sea was observed in Moderate Resolution Imaging Spectroradiometer (MODIS) imagery in May 2017. Using satellite imagery from MODIS, Visible Infrared Imaging Radiometer Suite, Geostationary Ocean Color Imager, and Ocean Land Imager, and combined with numerical particle tracing experiments and laboratory experiments, we examined the history of this bloom as well as similar blooms in previous years and attempted to trace the bloom source and identify the algae type. Results suggest that one bloom origin is offshore Zhejiang coast where algae slicks have appeared in satellite imagery almost every February-March since 2012. Following the Kuroshio Current and Taiwan Warm Current, these "initial" algae slicks are first transported to the northeast to reach South Korea (Jeju Island) and Japan coastal waters (up to 135°E) by early April 2017, and then transported to the northwest to enter the Yellow Sea by the end of April. The transport pathway covers an area known to be rich in Sargassum horneri, and spectral analysis suggests that most of the algae slicks may contain large amount of S. horneri. The bloom covers a water area of 160,000 km2 with pure algae coverage of 530 km2, which exceeds the size of most Ulva blooms that occur every May-July in the Yellow Sea. While blooms of smaller size also occurred in previous years and especially in 2015, the 2017 bloom is hypothesized to be a result of record-high water temperature, increased light availability, and continuous expansion of Porphyra aquaculture along the East China Sea coast.

  8. Homogeneity of Danish environmental and clinical isolates of Shewanella algae

    DEFF Research Database (Denmark)

    Vogel, Birte Fonnesbech; Holt, H.M.; Gerner-Smidt, P.

    2000-01-01

    Danish isolates of Shewanella algae constituted by whole-cell protein profiling a very homogeneous group, and no clear distinction was seen between strains from the marine environment and strains of clinical origin. Although variation between all strains was observed by ribotyping and random...... amplified polymorphic DNA analysis, no clonal relationship between infective strains was found. From several patients, clonally identical strains of S. algae were reisolated up to 8 months after the primary isolation, indicating that the same strain may be able to maintain the infection....

  9. [Effects of aniline and phenol on freshwater algae growth].

    Science.gov (United States)

    Chen, Chuan-ping; Zhang, Ting-ting; He, Mei; Wu, An-ping; Nie, Liu-wang

    2007-01-01

    By the methods of bioassay, this paper studied the effects of aniline or phenol on the growth of Chlorella pyrenoidosa and Scenedesmus obiquus. The results showed that these two compounds had evident effects on the growth of test algae species. For the same species, aniline was more toxic. Under the same concentration of the compounds, S. obiquus was more sensitive than C. pyrenoidosa. These two algae species could degrade or absorb parts of the compounds, and phenol in particular, when their concentrations were lower.

  10. Chemical composition of the green alga Codium Divaricatum Holmes.

    Science.gov (United States)

    He, Zhizhou; Zhang, Anjiang; Ding, Lisheng; Lei, Xinxiang; Sun, Jianzhang; Zhang, Lixue

    2010-12-01

    A new sterol, 24-R-stigmasta-4,25-diene-3β,6β-diol (1), along with three known compounds (2-3), was isolated from the green alga Codium divaricatum Holmes, a traditional Chinese medicine, which is efficacious against cancer. All structures were determined by spectroscopic methods and comparison with related known compounds. Single-crystal X-ray crystallography allowed us to confirm the structure of 1. To our knowledge, the compound 1 is reported as the first from natural source, and compounds 2, 4 have not been isolated from green algae before. Copyright © 2010 Elsevier B.V. All rights reserved.

  11. The attached algae community near Pickering GS: III

    International Nuclear Information System (INIS)

    McKinley, S.R.

    1982-01-01

    The relationship between attached algae and macro-invertebrates in the nearshore zone of Lake Ontario was investigated in the vicinity of the Pickering 'A' NGS. Measures of faunal density, richness, evenness, and biomass were generally higher from areas which supported attached algae. Gammarus fasciatus, Cricotopus bicinctus, Dicrotendipes spp., Orthocladius obumbratus, Cladotanytarsus spp., Orthocladius spp., and Parakiefferiella spp., were significantly correlated with algal standing crop. All of the above dominant invertebrates ingested epiphytes associated with Cladophora glomerata. Attempts to explain the distribution of the zoobenthic assemblages using the physical/biological characteristics of the study area indicated algal cover, substrate size, wind velocity and water temperature were most important

  12. Distribution and biomass estimation of shell-boring algae in the intertidal area at Goa India

    Digital Repository Service at National Institute of Oceanography (India)

    Raghukumar, C.; Sharma, S.; Lande, V.

    and particulate organic carbon (POC) values in cultures of the green alga Gomontia sp. and the blue-green alga Plectonema terebrans, in biomass and POC contribution of these two types of microalgae in shells were calculated....

  13. Distribution of algae, seagrasses, and coral communities from Lakshadweep islands, eastern Arabian Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Jagtap, T.G.

    Marine algae, seagrasses and coral from the intertidal, lagoon, reef and subtidal regions (up to 22 m depth) at Kavaratti, Agatti, Bangaram and Suheli islands, of Lakshadweep were studied Marine algae and seagrasses were mainly confined...

  14. Value of crops: Quantity, quality and cost price. [algae as a nutritional supplement

    Science.gov (United States)

    Meyer, C.

    1979-01-01

    Possibilities of using algae as a nutritional supplement are examined. The nutritional value and protein content of spirulines of blue algae are discussed. A cost analysis of growing them artificially is presented.

  15. Synthetic algae and cyanobacteria: Great potential but what is the exposure risk?

    Science.gov (United States)

    Green algae and cyanobacteria (hereafter, algae) have the attractive properties of relatively simple genomes, rapid growth rates, and an ability to synthesize useful compounds using solar energy and carbon dioxide. They are attractive targets for applications of synthetic biology...

  16. Algunas relaciones entre algoritmos y resolución de problemas

    Directory of Open Access Journals (Sweden)

    Jaime Fonseca González

    2012-04-01

    Full Text Available Como parte del estudio realizado en la tesis de maestría “Uso de algoritmos en la resolución de problemas sobre isometrías del plano. Un estudio de caso”, se han identificado diversas formas en que se relacionan los algoritmos con la resolución de problemas, no sólo como procesos mecánicos, sino como fuente de información en el planteamiento de estrategias al resolver un problema, de modo que surgen algunas maneras en que se da esta relación, ejemplificando cada una de ellas con problemas cuyo objeto matemático central son las isometrías del plano.

  17. ALGUNAS CONSIDERACIONES SOBRE EL PROBLEMA DE LA "MUERTE CEREBRAL"

    Directory of Open Access Journals (Sweden)

    Juan Mendoza Vega

    1978-10-01

    Full Text Available

    La muerte, ese momento final y hasta ahora inevitable que señala el término de la existencia terrestre de los seres, ha causado al hombre desde la más remota antigüedad una explicable angustia. No solo como protagonista -jamás mejor aplicado el término- sino en cuanto espectador conmovido por la desaparición de seres que le son queridos.

    Tal angustia ha movido los esfuerzos, cada vez más exitosos y complejos, para luchar contra las causas de la muerte; y ha desembocado, al acercarse el fin de otro milenio, en una situación, que parece absurdamente paradójica: la de una humanidad que, teniendo cada vez más y mejores medios para sostener las funciones corporales que aún persistimos en llamar "vitales" (reemplazando o estimulando una y otra vez en su función a los órganos que la han perdido empieza a preguntarse si es lícito y hasta cuándo el usar de tales medios, en presencia de un ser que ya no tiene las funciones superiores de su sistema nervioso ni la posibilidad razonable de recuperarlos.

    Este trabajo pretende dar una visión sintética del problema, con especial interés por la realidad colombiana y terminando con algunas propuestas acordes con esa realidad.


    Aspecto fisiológico de la muerte.
    Se aceptó durante siglos como definición de "muerte" la que vincula este fenómeno a la cesación de los ritmos respiratorios y cardíaco. Pero la aparición y perfeccionamiento de los aparatos y técnicas de respiración asistida o controlada, los desfibriladores cardíacos, las drogas capaces de modificar el ritmo del corazón, la presión arterial y otros parámetros, la creación de las "Unidades de Cuidados Intensivos", han forzado a poner en discusión tal concepto y buscar en cambio definiciones más acordes con el estado actual de nuestra ciencia y arte...

  18. Beberapa Marga Alga Benang dan Hubungannya dengan Keberadaan Vektor Malaria di Bali Utara

    OpenAIRE

    Seregeg, I. G

    1988-01-01

    A study of filamentous algae and its relation to malaria vector control was conducted during the dry season in several lagoons at the north coast of Bali. Floating masses of these algae under the sunshine barricated the spread of solar-triton larvicide, reducing tremendously the effectiveness of the larvicide. Identification of the genera of these algae under the subphyllum of CYANOPHYTA (Blue Algae) in the family of Cyanophyceae were Oscillatoria, Spirulina, Phormidium, Rivularia, Nostoc, an...

  19. Algae of economic importance that accumulate cadmium and lead: a review

    OpenAIRE

    Souza, Priscila O.; Ferreira, Lizângela R.; Pires, Natanael R. X.; S. Filho, Pedro J.; Duarte, Fabio A.; Pereira, Claudio M. P.; Mesko, Márcia F.

    2012-01-01

    Currently, algae and algae products are extensively applied in the pharmaceutical, cosmetic and food industries. Algae are the main organisms that take up and store heavy metals. Therefore, the use of compounds derived from algae by the pharmaceutical industry should be closely monitored for possible contamination. The pollution generated by heavy metals released by industrial and domestic sources causes serious changes in the aquatic ecosystem, resulting in a loss of biological diversity and...

  20. El papel de los esquemas en la resolución de problemas de enunciado verbal

    OpenAIRE

    Nesher, Pearla

    1999-01-01

    En el artículo se pretende demostrar que la capacidad para resolver problemas de matemáticas depende de los niveles de esquemas y en las estructuras que tienen los chicos y chicas. Se sugiere que si los profesores son conscientes de los esquemas necesarios para asentar cada nivel de aprendizaje y presentan los problemas de los alumnos de la forma más general posible, eso facilitar la resolución.