Experiencias de la Corporación Universitaria Adventista en la doble titulación académica

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Iglesias, Enoc; Corporación Adventista

2015-01-01

En el presente articulo no derivado de investigaciones, se muestran varios aspectos de las experiencias que ha tenido la Corporación Universitaria Adventista en la doble titulación, tema de gran actualidad.

La influencia del fenómeno El Niño y del índice de oscilación del sur en las precipitaciones de Cochabamba, Bolivia

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1998-01-01

Full Text Available INFLUENCE DU PHENOMENE EL NIÑO ET DE L’INDICE D’OSCILLATION DU SUD SUR LES PRECIPITATIONS DE COCHABAMBA, BOLIVIE. On n’avait, jusqu’à présent, apporté que peu d’importance à l’influence du phénomène El Niño et de l’Indice d’Oscillation du Sud (IOS sur les précipitations de Cochabamba et plus généralement de la Bolivie. L’étude a été réalisée à partir de l’information de 20 stations météorologiques des vallées hautes, centrales et basses du département de Cochabamba, situées entre 17°20’ et 17°45’ de latitude sud et 66°05’ et 66°20’ de longitude ouest en utilisant aussi les séries de TSM et de l’IOS. Les séries ont été étudiées au niveau annuel, mensuel et journalier, au niveau qualitatif et quantitatif. Une analyse des séries chronologiques a déterminé l’année hydrologique et les anomalies de précipitations, en calculant une moyenne mobile sur 4 ans pour les stations soumises à une influence rémanente des fronts du sud et à celle de la Zone de Convergence Intertropicale-ZCIT, et sur 5 ans pour le reste des stations. On a pu conclure que l’influence du phénomène El Niño était plus nette dans les précipitations enregistrées à Cochabamba qu’à Arani, alors que l’influence de l’IOS se fait davantage sentir à Arani qu’à Cochabamba. Ceci montre bien l’influence du phénomène El Niño et de l’IOS sur la distribution spatio-temporelle des précipitations des vallées de Cochabamba. Ces anomalies affectent directement l’agriculture et contribueront ensuite à l’aggravation des problèmes socio-économiques du département de Cochabamba. Tradicionalmente se ha dado poca importancia al fenómeno El Niño y al Índice de Oscilación del Sur en la influencia de la distribución espacio-temporal de las precipitaciones que se registran en los valles de Cochabamba, principalmente, y de forma general en Bolivia. El estudio se realizó en los valles Alto, Central y Bajo del departamento de

Cirugía coronaria con doble arteria mamaria: nuestra experiencia inicial y resultados a corto plazo

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Jorge Alcocer-Diéguez

2017-05-01

Conclusiones: La cirugía coronaria con doble mamaria es una técnica segura y con excelentes resultados de morbimortalidad a corto plazo. Son necesarios estudios de seguimiento clínico y angiográfico a largo plazo para determinar la mejor estrategia quirúrgica a emplear.

Materiales composites micro- y nano-estructurados basados en hidróxidos dobles laminares de tipo hidrotalcita y silicatos de la familia de las arcillas.

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Aranda, Pilar; Gómez Avilés, Almudena; Ruiz-Hitzky, Eduardo

2008-01-01

Materiales composites micro- y nano-estructurados basados en hidróxidos dobles laminares de tipo hidrotalcita y silicatos de la familia de las arcillas. La presente invención se refiere a materiales composites micro- o nano-estructurados basados en hidróxidos dobles laminares de tipo hidrotalcita y silicatos de la familia de las arcillas. La invención también se refiere al procedimiento de preparación de estos materiales así como a su uso en aplicaciones diversas tales...

II Actas Congreso .¿Nuevos feminismos?

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Pinyana i Garí, M. Carme

2005-01-01

ÍNDICE Presentación CONSOL AGUILAR RÓDENAS I. PONENCIAS La representación de la violencia / la violencia de la representación: De Jack el Destripador a Ciudad Juárez, pasando por la pantalla de la televisión,MARÍA RUIDO. Las apostillas al cuerpo: un ámbito de debates feministas, MERI TORRAS. Mujeres jóvenes y movimientos feministas: ¿Una nueva generación de feministas?,SHAMILLAH WILSON. La doble discriminación de las lesbianas,BEATRIZ GIMENO. II. MESAS REDONDAS ...

Recuperación del cromo y aluminio del licor de desecho (wl en forma de sales dobles

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Pedro R. Bassas-Noa

2006-03-01

Full Text Available El licor WL es un residual de la industria del níquel agresivo al medio ambiente por su acidez que contiene elementos metálicos de gran valor. Se propone un tratamiento para la separación con  hidróxido de amonio y la recuperación de la mayor cantidad de cromo y aluminio contenidos en el mismo. Se logra precipitar una mezcla de hidróxidos de aluminio que tratada con ácido sulfúrico permite obtener, por cristalización, la sal sulfato de aluminio y amonio dodecahidratada. Posteriomente se cristaliza la sal sulfato doble de cromo y amonio dodecahidratado. Se demuestra que el sulfato doble de cromo y amonio dodecahidratado y el sólido separado presentan características químicas que hacen posible su aplicación en la industria textil y de cerámica, entre otras. El esquema aplicado permite la recuperación de valores metálicos y la disminución del alto poder contaminante del licor de desecho WL.

Rejuvenecimiento facial en "doble sigma" "Double ogee" facial rejuvenation

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O. M. Ramírez

2007-03-01

Full Text Available Las técnicas subperiósticas descritas por Tessier revolucionaron el tratamiento del envejecimiento facial, recomendando esta vía para tratar los signos tempranos del envejecimiento en pacientes jóvenes y de mediana edad. Psillakis refinó la técnica y Ramírez describió un método más seguro y eficaz de lifting subperióstico, demostrando que la técnica subperióstica de rejuveneciento facial se puede aplicar en el amplio espectro del envejecimiento facial. La introducción del endoscopio en el tratamiento del envejecimiento facial ha abierto una nueva era en la Cirugía Estética. Hoy la disección subperióstica asistida endocópicamente del tercio superior, medio e inferior de la cara, proporciona un medio eficaz para la reposición de los tejidos blandos, con posibilidad de aumento del esqueleto óseo craneofacial, menor edema facial postoperatorio, mínima lesión de las ramas del nervio facial y mejor tratamiento de las mejillas. Este abordaje, desarrollado y refinado durante la última década, se conoce como "Ritidectomía en Doble Sigma". El Arco Veneciano en doble sigma, bien conocido en Arquitectura desde la antigüedad, se caracteriza por ser un trazo armónico de curva convexa y a continuación curva cóncava. Cuando se observa una cara joven, desde un ángulo oblicuo, presenta una distribución característica de los tejidos, previamente descrita para el tercio medio como un arco ojival arquitectónico o una curva en forma de "S". Sin embargo, en un examen más detallado de la cara joven, en la vista de tres cuartos, el perfil completo revela una "arco ojival doble" o una sigma "S" doble. Para ver este recíproco y multicurvilíneo trazo de la belleza, debemos ver la cara en posición oblicua y así poder ver ambos cantos mediales. En esta posición, la cara joven presenta una convexidad característica de la cola de la ceja que confluye en la concavidad de la pared orbitaria lateral formando así el primer arco (superior

"Acreditamiento del impuesto por dividendos aplicables para evitar la doble tributación"

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Hernández Sosa, Cleopatra

2011-01-01

Este trabajo de investigación es el producto del estudio de las implicaciones dentro del Derecho Fiscal internacional de una materia que se base, sobre todas las cosas, en la necesidad que tenemos nosotros los países de América Latina, de buscar una verdadera y sólida integración económica y haciendose énfasis en un aspecto tan importante como lo es el Comercio Internacional,y aún más tratándose de un tema tan importante como la búsqueda de la eliminación de la DOBLE TRIBUTACIÓN INTERNACIONAL...

Análisis estacional de la erosividad de las precipitaciones y la potencialidad de pérdida de suelo en la localidad de azul (Provincia de Buenos Aires, Argentina)

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Ares, María Guadalupe; Varni, Marcelo; Entraigas, Ilda

2012-01-01

La estimación de la erosividad de las precipitaciones a través del índice EI30 requiere contar con registros deta-llados de lluvia y su intensidad. Con el objetivo de hallar relaciones que faciliten su estimación se analizan las relaciones entre el factor EI30 y la pluviometría a escala diaria y estacional. Asimismo se estudian la variabili-dad estacional de la erosividad y los períodos de potencialidad de ocurrencia de eventos erosivos por despren-dimiento se suelo debido a la acción de la l...

Distribución espacial de las precipitaciones diarias en Chile mediante el índice de concentración a resolución de 1 mm, entre 1965-2005

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Sarricolea, Pablo; Martín-Vide, Javier

2012-01-01

Ponencia presentada en: VIII Congreso de la Asociación Española de Climatología celebrado en Salamanca entre el 25 y el 28 de septiembre de 2012. [ES]Chile posee una gran diversidad de climas, por causa de su amplia extensión latitudinal (17º29’57’’S a 56º32’ S), su contrastado relieve y los centros de acción y flujos (Anticiclón del Pacífico, Cinturón de bajas presiones subpolares, corriente en chorro, etc.). Las precipitaciones son muy dispares, entre 0,7 mm (Iquique) y 1.814,8 ...

El conflicto interrol en parejas de doble ingreso identificación y comprensión de las relaciones trabajo-familia

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Infante Rejano, Eduardo

2000-01-01

Desde las perspectivas sistémicas, la tesis describe y explica las relaciones posibles entre el ámbito del trabajo y el ámbito de la familia. Introduce el concepto de pareja de doble ingreso/carrera y de conflicto trabajo-familia, mostrando los tipos y la

LA CONTABILIDAD Y LA PARTIDA DOBLE: REPERCUSIÓN EUROPEA DE LA OBRA MAESTRA DE LUCA PACIOLI (SIGLOS XVI-XVIII

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Miguel Gonçalves

2011-08-01

Full Text Available El artículo asume como finalidad la de analizar como se procesó la divulgación del método de la partida doble, con especial relevo para la literatura contabilística que en mucho ayudó a su difusión. De entre los diversos autores que contribuyeron para su generalización y difusión, se destaca Luca di Bartholomeu dei Pacioli. Por consiguiente, el artículo también tiene como objetivo presentar una reseña de los principales aspectos de la vida y de la obra de este tratadista de la Contabilidad, considerado por muchos el precursor de nuestra disciplina, por haber publicado en 1494 en Venecia la Summa de Arithmetica, Geometria, Proportioni et Proportionalita, obra primordial en el dominio de nuestra especialidad, más concretamente una sección suya – el Tratatus Particularis de Computis y Scripturis (De las Cuentas y las Escrituras. Palabras-clave: Historia de la Contabilidad. Partida Doble. Registros Contabilísticos. Luca Pacioli. De Computis et Scripturis.

INFLUENCIA DE LA BACTERIA Pseudomonas fluorescens EN LA LECHE, SOBRE LAS CARACTERÍSTICAS SENSORIALES DEL QUESO DOBLE CREMA

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SJ González

2007-01-01

Full Text Available El objetivo de este trabajo fue observar el efecto de la presencia de microorganismos psicro-tróÀcos en la leche, sobre las características sensoriales del queso doble crema. Para esto, se inoculó la leche con un cultivo de Pseudomonas Áuorescens, a un nivel de 108 unidades formadoras de colonia por mililitro (ufc/ml. La leche se refrigeró a 4 ºC por seis días, se pasteurizó y posteriormente se preparó el queso. Se elaboraron lotes de queso cada 10 días, con el Àn de obtener siete tiempos experimentales. A cada uno se le determinó la vida útil sensorial. Los resultados de las pruebas sensoriales se analizaron con el programa S-PLUS de estadísti-ca de supervivencia aplicada a la vida útil sensorial de alimentos. Se determinó que el tiempo de vida útil sensorial del queso doble crema elaborado con leche en estas condiciones, y alma-cenado a 4 °C, está alrededor de 30 días, disminuyendo en un 50% con relación al patrón.

FRECUENCIAS ALELICAS Y GENOTIPICAS DEL GEN KAPPA CASEINA EN BOVINOS DE DOBLE PROPOSITO

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Nohémi Gabriela Cortes López

2012-01-01

Full Text Available En este trabajo, las frecuencias alélicas (A y B del gen CAS se determinaron como criterio de selección en la calidad de la leche en el ganado bovino de doble propósito. Se tomaron muestras sanguíneas de 200 hembras bovinas y se colocaron en tubos que contenían EDTA. Se amplifico el marcador MB002 a partir de material genético extraído. Los RFLP se realizaron con la enzima de restricción Hinf I para el diagnóstico de los alelos A y B en CASκ. Las frecuencias genotípicas obtenidas correspondían a 0.34, 0.01 y 0.65 para los alelos AA, BB y AB, respectivamente. Las frecuencias alélicas fueron de 0.67 y 0.33 para los alelos A y B, respectivamente. Además, se registró una heterocigosidad promedio de 0.6481. La población es estudio no se encuentra en equilibrio Hardy Weinberg, el valor ji cuadrada fue de 2 = 14.8 con 2 grados de libertad (P < 0.005. Basado en la frecuencia alélica de CAS  B (0.34 observada en este estudio, el ganado de doble propósito puede ser una opción viable para aumentar la calidad de la leche si se utilizan sementales con el genotipo BB para el cruce. De esta manera, los alelos B asociados a la calidad de la leche pueden mejorarse en pocas generaciones.

Las relaciones causales recíprocas del binomio Partida Doble-desarrollo de Occidente: La Teneduría de Libros de los mercaderes medievales

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Juan Lanero Fernández

2010-06-01

Full Text Available Mucho se ha escrito sobre la aportación de la Partida Doble al desarrollo económico de Occidente. El presente trabajo pretende presentar un análisis detallado del papel que desempeñó la contabilidad en la génesis del capitalismo. La contabilidad, como herramienta de gestión, fue un factor clave en la organización comercial.Después de ofrecer una visión panorámica de la organización del comercio en la época medieval y de considerar varias acepciones del concepto de partida doble, el estudio concluye que ésta fue al mismo tiempo causa y efecto de la transición de los mercaderes itinerantes a sedentarios.La expansión del comercio y del número de inversiones en las que un mercader podía estar inmerso a un mismo tiempo creó la necesidad de una integración y un ordenamiento que, en cierto modo, la Partida Doble exigía y propagaba. Un comercio más amplio demandaba un sistema gerencial mejor. Ese buen sistema gerencial –la partida doble-, fue un factor decisivo en el incremento comercial.Thousands of pages have been written about the double-entry contribution to the economic development of the Western world. The present paper tries to present a detailed analysis on the role played by Accounting in the genesis of capitalism. Accounting, as a management tool, was a key factor in the commercial organization.After having offered a general view about the organization of commerce in the Medieval era, some double-entry concepts are dealt with. The study concludes that double-entry was at the same time cause and effect of the transition from travelling merchants to resident ones.The expansion of commerce and the number of investments a merchant could be involved in at a time created the need of an integration and an order that, to certain extent, double-entry implied and spread. A bigger commerce demanded a better management system. This managerial system –the double-entry-, was a conclusive factor in the commercial growth.

LA RELACIÓN ENTRE TRATADOS DE INVERSIÓN Y CONVENIOS DE DOBLE TRIBUTACIÓN: el caso chileno

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Lazo, Rodrigo Polanco; Villanueva, Felipe Yáñez

2016-01-01

El presente artículo examina las relaciones entre los tratados de inversión y los tratados de doble tributación, considerando que, en la actual evolución de ambos tipos de acuerdos, sus disposiciones pueden presentar superposiciones en aspectos tales como estándares de protección, transparencia, trato nacional, cláusula de la nación más favorecida, expropiación y transferencias de capital. Tomando el ejemplo de los tratados suscritos por Chile, en este trabajo se examinan las consecuencias de...

LOS LIBROS MANUAL Y MAYOR DE LA CAJA DE LA SACRISTÍA DE LA CATEDRAL DE VALENCIA: UNA ADAPTACIÓN DE LA PARTIDA DOBLE (1546-1555

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Inmaculada Llibrer Escrig

2016-07-01

Full Text Available Este trabajo analiza dos libros de cuentas: un manual y un mayor, empleados para registrar las transacciones del efectivo depositado en la caja fuerte de la Catedral de Valencia. Siguiendo a de Roover, la mera existencia de los libros manual y mayor no es suficiente para afirmar su pertenencia a la partida doble, por lo que fue necesario revisar todos los elementos característicos de este método y compararlos con los que se encontraban en estos libros. También, se fijó como objetivo conocer los motivos que determinaron el modo de registro empleado, pretendiendo conocer la naturaleza de la información que este sistema aportaba y por qué no se respetaron algunas reglas de la partida doble. El sistema contable aprovechó las ventajas del método contable introduciendo varias innovaciones como: los asientos de ajuste sólo en el libro mayor, un doble asiento de apertura y la incorporación, previa a la apertura, del detalle de todas las transacciones que, consecuencia de los ajustes en los libros anteriores, conducían al saldo de apertura. El estudio permite inferir la concepción económica que el cabildo tenía de su organización y el rol que el sistema contable jugó dentro de la organización dado que la información era de carácter interno y confidencial.

Restauración de la casa doble de Le Corbusier en la Weissenhofsiedlung

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Arne Fentzloff

2014-07-01

Full Text Available La Casa Doble diseñada por Le Corbusier en 1927 para la Weissenhofsiedlung constituye un hito en el diseño y construcción de viviendas en el Movimiento Moderno. Su precario estado de conservación requería una restauración que la Fundación Wüstenrot ha acometido con la voluntad no de repristinar necesariamente a su condición originaria, sino de restaurar el conjunto y habilitarlo para la visita pública conservando al menos parcialmente las diversas reformas y adaptaciones de uso que había sufrido estas viviendas pareadas durante sus años de historia. El texto explica abundantes detalles constructivos de su proceso de diseño y construcción y revela las soluciones técnicas adoptadas durante la restauración.

Mejoramiento de la eficiencia de una extrusora de doble tornillo para fabricación de tubería

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Suescum, Juan A.; Rigail, Andres

2009-01-01

El rendimiento de las máquinas en una industria es de gran importancia en el momento de determinar los costos del producto elaborado. En este trabajo se enfocó la optimización en el uso de una extrusora de doble tornillo con la finalidad de disminuir los gastos generados por desechos y fallas de calidad. Para esto, se describió el proceso de extrusión, considerando la composición del compuesto, el diseño del molde y de los calibradores. Conociendo el proceso se logró identificar sus limita...

Expectativas en la cirugía de triple procedimiento versus doble procedimiento quirúrgico en afecciones corneales Expectations of triple procedure versus double procedure surgery in corneal diseases

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Emilio Kuri Cienfuegos

2007-12-01

Full Text Available Se realizó un estudio retrospectivo y descriptivo con el propósito de evaluar el comportamiento de los procedimientos quirúrgicos doble y triple, en pacientes operados de enfermedades de la córnea en el Servicio de Oftalmología del Hospital Clínicouirúrgico “Hermanos Ameijeiras” de Ciudad de La Habana, desde julio de 2003 hasta diciembre de 2005. La muestra estuvo constituida por 45 ojos operados de trasplante de córnea entre enero de 1988 y junio de 2003 en el Servicio de Oftalmología del Hospital Clínicoquirúrgico “Hermanos Ameijeiras” de Ciudad de La Habana. Las variables estudiadas fueron: edad, sexo, antecedentes personales oculares, enfermedad corneal previa, retrasplante, viabilidad del injerto corneal, complicaciones ocurridas durante la cirugía y después de esta, agudeza visual prequirúrgica y posquirúrgica, error de cálculo de la lente intraocular y de refracción. Se obtuvo como resultado: predominio del sexo masculino (51,1%, edad promedio 60,27 años, la enfermedad ocular asociada más frecuente en el doble y triple procedimiento fue el glaucoma con 22,7 % y 26,1 % respectivamente, la enfermedad corneal más común fue la distrofia epitelio-endotelial de Fuchs en ambos procederes (72,7 % y 52,2 %; no tuvieron complicaciones transquirúgicas 90,9 % y 95,5 %, respectivamente. Las complicaciones posquirúrgicas fueron de 9,1 % en el doble procedimiento y de 26,1 en el triple. La opacidad corneal posoperatoria se presentó en el doble proceder en 9,1 % y en el triple en 17,4 %. Hubo más retrasplantes en el triple procedimiento (17,4 %. El error refractivo final en el doble procedimiento presentó mayor cantidad emétropes y menos hipermétropes que el triple, mientras que en relación con los miopes se encontró, solo en el doble procedimiento, mejor agudeza visual en el doble procedimiento. El error de cálculo de lente intraocular fue mayor en el triple procedimiento.A retrospective descriptive study was

Adelantamiento con vehiculos autónomos en carreteras de doble sentido

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Joshué Pérez

2010-07-01

Full Text Available Resumen: Las investigaciones llevadas a cabo para el control de vehículos autónomos en maniobras cooperativas están en la vanguardia de los Sistemas de Transporte Inteligente (ITS. Ejemplos de esta cooperación se plasman en intersecciones, control de crucero adaptativo (ACC y adelantamientos, entre otros. Los adelantamientos requieren especial atención en un entorno variable, y sobre todo si se aproxima un vehículo en sentido contrario. En el presente artículo se plantea un algoritmo de decisión, un sistema de comunicaciones entre tres vehículos y un controlador borroso para la conducción de un vehículo en una maniobra de adelantamiento. Se han considerado diferentes casos de uso, en los que conviene abortar o terminar la maniobra de adelantamiento en una carretera de doble sentido. Los resultados obtenidos demuestran que, basándonos en el conocimiento humano, se pueden ajustar controladores borrosos para la conducción autónoma de vehículos en maniobras de alto riesgo. Palabras clave: Comunicación entre vehículos, Adelantamientos, Controlador borroso, Vehículos autónomos, GPS

Desarrollo de una bomba reciprocante de doble efecto para desalinización de agua por medio de osmosis inversa

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Carlos Julián Ospina; Álvaro Pinilla

2008-01-01

El presente artículo describe el trabajo realizado en el desarrollo de un sistema de bombeo para desalinización con membranas de osmosis inversa. El sistema debe cumplir con requerimientos de alta presión (4.8 MPa) y bajos caudales (3.78 L/min), para operar la membrana de osmosis inversa en su rango de mínimo consumo energético. Para cumplir este objetivo se desarrolla un sistema de desplazamiento positivo de acción simple y doble efecto, impulsado con un motoreductor cicloidal. La bomba desa...

Educación mapuche y educación escolar en la Araucanía: ¿doble racionalidad educativa?

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Quilaqueo Rapimán,Daniel; Quintriqueo Millán,Segundo; Riquelme Mella,Enrique Hernán; Loncón Antileo,Elisa

2016-01-01

Resumen Este artículo aborda la construcción social de una doble racionalidad en el conocimiento educativo mapuche. El marco de referencia sostiene una base epistémica de conocimientos educativos mapuche y la noción de relación con el saber, donde la ecuación pasado incorporado más contexto de acción presente, es igual a prácticas observables. La metodología plantea una crítica epistemológica a la investigación tradicional realizada sobre los pueblos indígenas. Los resultados sintetizan las p...

Evaluación del comportamiento hidráulico en un reactor anaerobio de doble cámara (RADCA)

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Nancy Rincón; Andres Galindo; Jhonny Pérez

2011-01-01

En la remoción de carga orgánica en un sistema de tratamiento de aguas residuales intervienen los procesos bioquímico y aspectos hidrodinámicos como las características de flujo, régimen de mezcla, tiempos de residencia, geometría del reactor, por otro lado las condiciones de flujo no ideal tales como cortos circuitos, zonas muertas y recirculación interna afectan su desempeño. En esta investigación se evaluó el comportamiento hidráulico de un reactor anaerobio de doble cámara (RADCA) de 5...

SIMULACIÓN ESTACIONARIA DE UN EVAPORADOR DE DOBLE EFECTO PARA JUGO DE TOMATE

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Álvaro Núñez

2012-01-01

Full Text Available En este trabajo se desarrolló un modelo estacionario para simular un sistema evaporador de doble efecto destinado a la concentración de jugo de tomate. Debido a que el licopeno muestra capacidad antioxidante, es deseable que su concentración sea máxima en la pasta de tomate. Ello se logra optimizando tanto el diseño como las condiciones de operación del equipo concentrador de jugo. Para alcanzar ese objetivo, se incorporó al modelo la cinética de degradación del licopeno, y se realizó un estudio de sensibilidad para determinar las relaciones que vinculan las variables de proceso. El estudio determinó que el contenido de licopeno en el producto es altamente sensible al tiempo de residencia; mientras que el consumo de vapor está determinado por la presión del vapor de servicio y las presiones de los efectos.

MODELO MATEMÁTICO APLICADO A LA CURVA DE LACTANCIA EN GANADO VACUNO DOBLE PROPÓSITO

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Luz Botero

2006-05-01

Full Text Available hembras vacunas. Materiales y métodos. Durante 11 meses, se estudió la producción de leche en 500novillas doble propósito Bos taurus x Bos indicus, de las sabanas del trópico bajo colombiano. Laproducción se cuantificó en kilogramos. Se incluyeron los datos de la producción de leche en época(seca-lluviosa y número de lactancias (primera; segunda y tercera y, más de tres. Los datos hacen partedel archivo de la Ganadería XB, ubicada en las sabanas de Bolívar, Colombia, recopilados desde el año1990 hasta el 2000. A estos datos se le aplicó los modelos lineal simple, cuadrático, lineal logarítmico,cuadrático logarítmico, gamma incompleto, lineal hiperbólico y polinomial inverso. Los parámetros paralos modelos gamma incompleto y polinomial inverso fueron estimados, a partir del método de “Gauss-Newton”, para la regresión no lineal; los demás modelos fueron ajustados por regresión lineal de lasproducciones, en función de los meses en lactancia, por el método de los cuadrados mínimos. Resultados.En los modelos propuestos, se observó que el modelo polinomial inverso es el que mejor caracteriza lacurva de lactancia por presentar los mayores valores para el estadístico Durbin-Watson y coeficiente dedeterminación (R2 y sobre dicho modelo existe información necesaria para obtener parámetros prácticoscalculados a partir de la ecuación de la curva de lactancia. Conclusión. El modelo matemático polinomialinverso se constituye en una excelente herramienta para aplicar en la administración y toma de decisionesen el manejo de hatos del sistema de doble propósito

Control de gestión en unidades de producción de ganadería de doble propósito

OpenAIRE

Martínez, Edmar; López, María Isolina

2012-01-01

La empresa agropecuaria, al igual que las empresas comerciales, manufactureras o de servicios, requiere ser gerenciada con criterios administrativos que le permitan mejorar su proceso productivo, el uso eficiente de los recursos e incrementar su rentabilidad. Esta investigación tuvo como objetivo analizar el control de gestión utilizado en unidades de producción de ganadería de doble propósito del municipio Colón del Estado Zulia. La población estuvo conformada por el 10% de 903 f...

Alcance jurídico fiscal del establecimiento permanente de empresas extranjeras en los convenios de doble imposición internacional

OpenAIRE

Bermeo Córdova, Carmen Lucía

2013-01-01

Los convenios de doble imposición internacional surgen ante la necesidad de regular aquellas situaciones en las que dos potestades fiscales ejercen su facultad tributaria gravando la actividad de un mismo sujeto pasivo y dentro de un mismo período. Este fenómeno, más allá de crear un conflicto entre los Estados, constituye un obstáculo para el libre intercambio de bienes y servicios, por lo que ha sido motivo de análisis y discusión de organismos internacionales y regionales, entre ellos, la ...

La doble historia de El convidado de papel

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Ceballos Viro, Álvaro

2011-12-01

Full Text Available This article sets out to question the textual history of El convidado de papel, a novel by Benjamín Jarnés. The differences between the two firsts editions of this novel, published in 1928 and 1935, are more complex than has hitherto been assumed. They also allow to reconstruct a different plot from the one that can be found in literary histories. In its original version, El convidado de papel was not only a peculiar Bildungsroman, but also a typical doppelgänger narrative. Therefore, it contained a dense web of intertextual references which Jarnés deliberately eliminated in the second edition of the novel. These intertextual references stimulate the search for new sources as well as the re-evaluation of the precise mode of influence attributed to familiar sources.La presente contribución comienza problematizando la historia textual de El convidado de papel, de Benjamín Jarnés. Las diferencias entre las dos primeras ediciones, que datan de 1928 y 1935, no sólo son más complejas de lo que hasta ahora se había creído, sino que además permiten reconstruir un argumento diferente de aquél tácitamente consensuado por la historiografía literaria. Sin dejar de ser una peculiar novela de formación, El convidado de papel era en su versión original una novela de doble en toda regla, lo que la abría a unas relaciones intertextuales que Jarnés eliminó conscientemente en la segunda edición. Tales relaciones permiten, por un lado, sugerir nuevas influencias (o modos de influencia en la narrativa jarnesiana y, por otro lado, profundizar en las deudas contraídas con autores cuyo ascendiente ya era conocido por la crítica.

Comportamiento de las precipitaciones en el sector del lago Titicaca (Bolivia durante 'El fenómeno El Niño'

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1998-01-01

Full Text Available REGIME DES PRECIPITATIONS DANS LE SECTEUR BOLIVIEN DU LAC TITICACA AU COURS DU “PHENOMENE EL NIÑO”. Le phénomène “El Niño” affecte tout le territoire bolivien, provoquant des sécheresses dans plusieurs régions de l’Altiplano, dont fait partie le secteur du lac Titicaca, même en tenant compte du rôle thermorégulateur joué par le grand volume d’eau du lac. Ce travail a été réalisé pour évaluer l’influence des épisodes ENSO (phase chaude sur le régime des précipitations dans ce secteur, en apportant une attention particulière à l’ENSO 1982-1983. Nous avons étudié les précipitations de l’été (période humide provenant de 7 stations réparties dans les environs du lac Titicaca. Les premiers résultats montrent qu’il existe un déficit de précipitations dans la région étudiée, principalement au cours du El Niño 1982-1983 et de l’été antérieur où certains secteurs se situèrent cependant au-dessus de la normale. El fenómeno “El Niño” afecta significativamente a todo el territorio boliviano, con sequías en diferentes regiones del Altiplano del que no escapa el sector del lago Titicaca, aun teniendo en cuenta el comportamiento termorregulador del gran volumen de agua del Lago. Este trabajo se realizó para ver la influencia de los episodios ENOS (fase caliente en el comportamiento de las precipitaciones en el sector arriba nombrado se hizo énfasis en el ENOS 1982-1983. En el estudio se realizó un análisis del comportamiento de las precipitaciones de siete estaciones distribuidas alrededor del lago Titicaca. También se hizo una correlación con las aportaciones, probabilidades de precipitación para El Niño 1997, todo lo anteriormente nombrado para el periodo húmedo (verano. Como primeros resultados se tiene que, en toda la región estudiada, existe un déficit de precipitación principalmente en El Niño 1982-1983, y en el verano anterior 1981-1982, a pesar de que en algunos de los sectores

Regional Analysis of Precipitation by Means of Bivariate Distribution Adjusted by Maximum Entropy; Analisis regional de precipitacion con base en una distribucion bivariada ajustada por maxima entropia

Energy Technology Data Exchange (ETDEWEB)

Escalante Sandoval, Carlos A.; Dominguez Esquivel, Jose Y. [Universidad Nacional Autonoma de Mexico (Mexico)

2001-09-01

The principle of maximum entropy (POME) is used to derive an alternative method of parameter estimation for the bivariate Gumbel distribution. A simple algorithm for this parameter estimation technique is presented. This method is applied to analyze the precipitation in a region of Mexico. Design events are compered with those obtained by the maximum likelihood procedure. According to the results, the proposed technique is a suitable option to be considered when performing frequency analysis of precipitation with small samples. [Spanish] El principio de maxima entropia, conocido como POME, es utilizado para derivar un procedimiento alternativo de estimacion de parametros de la distribucion bivariada de valores extremos con marginales Gumbel. El modelo se aplica al analisis de la precipitacion maxima en 24 horas en una region de Mexico y los eventos de diseno obtenidos son comparados con los proporcionados por la tecnica de maxima verosimilitud. De acuerdo con los resultados obtenidos, se concluye que la tecnica propuesta representa una buena opcion, sobre todo para el caso de muestras pequenas.

Doble Aneuploidia (Trisomia 21 Y XXY): Reporte de caso de Sindrome Down-Klinefelter con delecion (XP)(P11.3-Pter) heredada

OpenAIRE

De La Torre-Hernandez, Carlos A; Ochoa-Sifontes, Julio C

2015-01-01

En los síndromes Down (SD) y Klinefelter (SK) independientes entre si, ambas aneuploidías cromosómicas son causadas por exceso. La ocurrencia de estas dos alteraciones en un individuo es un fenómeno relativamente raro. En casos de doble aneuploidiìa donde están involucrados autosomas y cromosomas sexuales, predominan las manifestaciones clínicas relacionadas con los autosomas y se solapan las de cromosomas sexuales. Caso clínico: se trata de un paciente de dos anÞos de edad, con signos sugere...

Los Sofistas y la Antilogía. Sobre las Estructuras Argumentales en los "Discursos Dobles" y en Gorgias

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Alejandro Ramírez Figueroa

2016-06-01

Full Text Available RESUMEN: Se examina la estructura lógica de la antilogía como forma de pensamiento ejercida por los sofistas. Se sostiene que, si bien en los argumentos antilógicos se encuentran falacias de tipo no formal, al menos algunos de tales razonamientos no son falacias desde un punto de vista simbólico formal, sino que poseen estructuras que hoy se pueden reconstruir como esquemas con validez lógica. Se analizan específicamente dos lugares de argumentaciones sofistas: los denominados Discursos dobles, textos anónimos del IV AC, y la obra principal de Gorgias. Se identifican en ellos 8 argumentos con estructura lógica válida.

Observación de la conducta homosexual en un rebaño de vacas mestizas de doble propósito

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Lozada Melero, Rafael Enrique

2011-01-01

La identificación de la conducta homosexual de las hembras bovinos de la ganadería mestiza de doble propósito en la República Bolivariana de Venezuela, particularmente en el estado Trujillo; ha sido poco estudiada a pesar de ser una importante herramienta en la unidad de producción bajo programas de inseminación artificial. Para determinar la frecuencia de los principales síntomas y signo del celo, así como su relación con el diagnostico de la gestación por vía transrectal, en una finca (...

El cultivo de alfalfa utilizando agua de perforación, agua residual urbana y precipitaciones The cultivation of alfalfa using artesian well water, urban wastewater and rainfall

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José O. Plevich

2012-12-01

Full Text Available El objetivo de este trabajo fue analizar la producción de biomasa aérea, la eficiencia del uso de agua y el valor nutritivo de alfalfa cultivada aplicando riego con agua residual urbana, agua de perforación y un testigo (precipitaciones, en el Campus de la Universidad Nacional de Rio Cuarto (Córdoba-Argentina. Los tratamientos de riego tuvieron un efecto positivo sobre la producción de biomasa aérea obteniéndose un 24% más de producción de biomasa que en la situación de secano (precipitaciones. Entre los tratamientos con riego también se manifestaron diferencias estadísticamente significativas. La alfalfa regada con aguas residuales urbana supero en un 19% a la cultivada con agua de perforación. La eficiencia del uso del agua por parte del cultivo se incrementó cuando el riego se realizó con aguas residuales urbanas. Además, se determinó que la alfalfa regada con agua residual, supera los valores nutritivos del cultivo que crece en condiciones sin riego; encontrándose 39% más de proteínas, 14% más de digestibilidad e igual porcentaje de energía metabólica. Se puede concluir que el agua residual urbana representa otra posible fuente de agua, factible de ingresar al suelo y estar a disposición para el cultivo de alfalfa.The objective of this study was to analyse the production of alfalfa biomass, the efficiency of water use and the nutritional value of forage, inside an irrigation structure of an experimental facility that uses treated urban wastewater, artesian well water and rainfall, at the campus of the Universidad National de Rio Cuarto (Córdoba-Argentina. The irrigation treatment had a positive effect on the production of biomass of alfalfa. On an average 24% increase in production was observed when compared to dry-land farming. Regarding the quality of the irrigation water, statistical differences in production were observed, the irrigation with urban wastewater produced 19% more than that of well water. The

Efecto de la suplementación con grasa protegida sobre la producción y calidad de carne de toretes mexicanos doble propósito

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German Mendoza M

2011-04-01

Full Text Available Objetivo. Evaluar la respuesta productiva y calidad de la carne de toretes doble propósito a la adición de grasa protegida (GP en su dieta. Materiales y métodos. Se utilizaron 45 toretes comerciales (B. taurus x B. indicus, divididos en tres bloques de 15 animales, de acuerdo con su peso vivo en pequeños, medianos y grandes. Cada bloque fue dividido en tres subgrupos de 5 animales, asignados aleatoriamente a los tratamientos 0, 1.5 y 3% de GP, en un diseño de bloques completamente al azar. Resultados. No hubo diferencias (p>0.05 en comportamiento productivo. La grasa dorsal fue mayor (p0.05 en área del ojo de la costilla (AC ni pH de la carne. El contenido de proteína cruda de la carne incrementó (p0.05 entre tratamientos. Conclusiones. Adicionar GP a dietas para bovinos doble propósito en finalización no modificó la respuesta productiva, pero mejoró algunas características de la canal y de la carne. Se sugiere realizar más investigación, utilizando el mismo tipo de animales, con niveles mayores de GP a los usados en este estudio, ya que la respuesta pudiera mejorar.

Observación de la conducta sexual en un rebaño bovino de doble propósito en el estado Trujillo

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Linares, Eivar

2009-01-01

La identificación de la conducta sexual de los bovinos de la ganadería mestiza de doble propósito en la Republica Bolivariana de Venezuela, ha sido relativamente poco estudiada a pesar de constituir una de las tareas más importantes que se desarrollan en el control reproductivo en un sistema de explotación bajo la técnica de inseminación artificial. Para determinar los principales síntomas y signo del celo asociados a la primera monta de celo observada, en una finca de ganado mestizo de d...

DISEÑO A DOBLE CIEGO Y EL USO DE PLACEBOS PSICOLÓGICOS EN INVESTIGACIÓN DE RESULTADOS EN PSICOTERAPIA: ES POSIBLE? UN ESTUDIO PILOTO DE VIABILIDAD

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EDUARDO H. CAZABAT

2014-01-01

Full Text Available El uso de placebos y diseños a doble ciego ha cumplido un papel crucial en la investigación clí- nica en Medicina. Su aplicación a la investigación de resultados en psicoterapia ha sido controver- sial. Muchos autores niegan la posibilidad de su aplicación debido a que el terapeuta debería co- nocer la condición del procedimiento aplicado. Se presenta detalladamente un estudio en el que se uti - lizó un procedimiento placebo correspondiente a EMDR ( Eye Movement Desensitization and Re- processing - Desensibilización y Reprocesa- miento por Movimientos Oculares con un Dise- ño Experimental de Caso Único. Los objetivos fue- ron los siguientes: poner a prueba la viabilidad de la implementación de un placebo de tipo psico- lógico en EMDR y la aplicación de un diseño a do- ble ciego en el estudio de resultados en EMDR. Se seleccionaron tres pacientes que sufrían de Trastorno por Estrés Postraumático. Se estable- ció una línea de base de la sintomatología pre- sentada. Luego, los sujetos fueron asignados ale atoriamente a tres condiciones experimenta- les durante tres sesiones: (a aplicación del pro- tocolo EMDR sin ningún tipo de estimulación con auriculares en silencio (placebo 1, (b apli-cación del protocolo EMDR con estimulación bilateral auditiva simultánea (no alternada (pla- cebo 2 y (c aplicación del protocolo estándar de EMDR con estimulación auditiva bilateral al- ternada (tratamiento activo. Tales procedimientos resultaron igualmente creíbles para el paciente y para el terapeuta. Es to permitió el desarrollo de un diseño de investiga- ción a doble ciego para la investigación de resul- tados en EMDR. Finalmente, se discuten algunas posibles aplicaciones e implicancias de la intro- ducción del uso de placebos psicológicos y diseño a doble ciego en la investigación en psicoterapia.

La resistencia a tracción indirecta del hormigón por doble punzonamiento. Influencia del tamaño máximo del árido y de la excentricidad

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Perepérez Ventura, Bernardo

1985-10-01

Full Text Available After reminding the interest, or the need, to know the concrete tensile strength, and having analyzed critically normal test methods, it /s briefly described the test method of indirect tension by "double punch test", proposed by W. F. Chen. The experimental results obtained on three different concretes, two among them of a common density and a third with expanded clay as coarse aggregate, are shown. It has been proved that for normal density concretes, the tensile strength by "double punch test" has little sensibility to the variation of the aggregate maximum size, opposite to which it takes place in the splitting test, and the error of the centred of the "punch" has a minimum influence on the results, till very high eccentricities are reached. In conclusion, indirect tension test by double punch test is simple, practical and reproducible, responding to the needs to the needs of a commercial routine.Tras recordar el interés o la necesidad de conocer en ocasiones ¡a resistencia a tracción del hormigón y realizar un análisis crítico de los métodos de ensayo al uso, se describe brevemente el método de ensayo de tracción indirecta por "doble punzonamiento" propuesto por W. F. Chen. Se presentan los resultados experimentales obtenidos sobre tres hormigones distintos, dos de densidad ordinaria y un tercero con arcilla expandida como árido grueso. Se ha comprobado que, para hormigones de densidad normal, la resistencia a tracción por "doble punzonamiento" es muy poco sensible a la variación del tamaño máximo del árido, contrariamente a lo que sucede con el ensayo brasileño, y que el error de centrado de los "punch" tiene una influencia mínima sobre los resultados hasta que se alcanzan excentricidades muy altas. Se concluye que el ensayo de tracción indirecta por "doble punzonamiento" es simple, práctico y reproducible, respondiendo a las necesidades de una rutina comercial.

Factores que determinan el uso de innovaciones tecnológicas en la ganadería de doble propósito en Sinaloa, Mexico

OpenAIRE

Venancio Cuevas Reyes; Julio Baca del Moral; Fernando Cervantes Escoto; José Antonio Espinosa García; Jorge Aguilar Ávila; Alfredo Loaiza Meza

2013-01-01

El objetivo del presente estudio fue analizar los factores que inciden en la adopción de innovaciones por parte de productores de bovinos de doble propósito. Mediante selección no estocástica de 121 productores que participaron en el programa Soporte de la SAGARPA en el periodo 2010-2011, se identificaron por medio de estadísticos de posición, tres tipos de productores con diferente uso de tecnología (alto, medio y bajo); por medio de un análisis de varianza y una prueba de Ji-cuadrada se det...

LA RELACIÓN ENTRE TRATADOS DE INVERSIÓN Y CONVENIOS DE DOBLE TRIBUTACIÓN: el caso chileno

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Rodrigo Polanco Lazo

Full Text Available El presente artículo examina las relaciones entre los tratados de inversión y los tratados de doble tributación, considerando que, en la actual evolución de ambos tipos de acuerdos, sus disposiciones pueden presentar superposiciones en aspectos tales como estándares de protección, transparencia, trato nacional, cláusula de la nación más favorecida, expropiación y transferencias de capital. Tomando el ejemplo de los tratados suscritos por Chile, en este trabajo se examinan las consecuencias de las trasposiciones de ambos acuerdos, desde el punto de vista de sus mecanismos de solución de controversias, como en lo referido a los conflictos de jerarquía normativa entre esos dos tipos de tratados. Asimismo, se efectúa un análisis sobre iniciativas de tipo multilateral que afectan a ambas categorías de acuerdos como el Base Erosion and Profit Shifting (BEPS.

Factores que determinan el uso de innovaciones tecnológicas en la ganadería de doble propósito en Sinaloa, Mexico

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Venancio Cuevas Reyes

2013-01-01

Full Text Available El objetivo del presente estudio fue analizar los factores que inciden en la adopción de innovaciones por parte de productores de bovinos de doble propósito. Mediante selección no estocástica de 121 productores que participaron en el programa Soporte de la SAGARPA en el periodo 2010-2011, se identificaron por medio de estadísticos de posición, tres tipos de productores con diferente uso de tecnología (alto, medio y bajo; por medio de un análisis de varianza y una prueba de Ji-cuadrada se determinaron las variables que inciden en la implementación de sus prácticas tecnológicas. El uso promedio de innovaciones resultó significativo (P<0.05 en la diferenciación de los grupos de productores, en tanto las variables significativas (P<0.05 para su descripción fueron el número de vacas adultas, la distancia de la unidad de producción al municipio, el método de reproducción, el tipo de ordeño y los años de recibir asistencia técnica. Se concluye que la tipología realizada permitió identificar tres tipos de productores de acuerdo al uso de innovaciones tecnológicas; por grupo los factores que influyen en la adopción de innovaciones fueron aquéllos relacionados con variables de escala, localización, tecnológicos y de innovación. Los resultados pueden servir para reorientar y planificar programas de transferencia tecnológica en sistemas de producción de doble propósito.

LOS PROCESOS DE ÚNICA INSTANCIA EN EL CÓDIGO GENERAL DEL PROCESO: LA GARANTÍA CONSTITUCIONAL DEL DEBIDO PROCESO Y LA DOBLE INSTANCIA

OpenAIRE

Jiménez Ramírez, Milton César; Yáñez Meza, Diego Armando

2017-01-01

En el presente artículo se evalúa la figura de la única instancia en la ley 1564/2012 o Código General del Proceso, con la finalidad de determinar si estos procesos son una infracción a la garantía constitucional del debido proceso y la doble instancia. Esta ley en sus artículos 17, 19 y 21, estableció la competencia de los jueces civiles municipales, civiles de circuito y de familia en procesos de única instancia, disposiciones que pueden constituirse como una infracción a la garantía proces...

El Paleolítico Medio en el Cáucaso Meridional: la Cueva Doble (Valle de Tsutskhvati, República de Georgia

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Fernando DÍEZ MARTÍN

2010-08-01

Full Text Available El presente trabajo recoge los principales resultados derivados de la intervención arqueológica acometida entre los años 2002 y 2003 en el Valle de Tsutskhvati (República de Georgia, principalmente centrados en una nueva ronda de excavaciones en la Cueva Doble. Los estudios estratigráficos, tecnológicos, tafonómicos y polínicos permiten arrojar nuevos datos, complementarios a los obtenidos en la cercana cueva de Ortvale Klde, sobre las comunidades neandertales que habitaron la región del Cáucaso meridional, uno de los entornos geográficos en los que sobrevivieron los últimos representantes de esta especie. Mientras que los completos trabajos arqueológicos abordados en la cueva de Ortvale Klde han permitido contar con un amplio programa de datación para la presencia neandertal en dicha cavidad, el resto de los yacimientos del mismo periodo siguen presentando una cierta indefinición contextual. A pesar de ello, se acepta que la presencia neandertal en el valle de Tsutskhvati debió situarse en el mismo marco temporal que en Ortvale Klde. Aunque tanto la Cueva Doble, motivo de esta publicación, como la famosa Cueva del Bronce carecen hoy en día de contextos cronológicos fiables, es necesario señalar que estos yacimientos del valle de Tsutskhvati vienen siendo recurrentemente citados en el debate sobre el fin de los neandertales y la llegada de las primeras comunidades sapiens a la región caucásica. Es por ello por lo que la información novedosa aquí presentada (los últimos trabajos en Tsutskhvati se llevaron a cabo en la década de 1970 posee un indudable interés, a pesar de las limitaciones cronológicas, para ampliar nuestro conocimiento sobre este importante capítulo de la Prehistoria europea.

Sistema de producción doble propósito efecto del zeranol y de 17-b estradiol sobre el peso al destete en terneros cruzados

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Sánchez G. Hugo

1986-06-01

Full Text Available En la primera semana de vida se implantaron veinticuatro (24 terneros machos provenientes de una ganadería de doble propósito con 17 -8 estradiol (Compudose-200, zeranol (Ralgro con reimplante a los noventa días, zeranol una sola dosis y con el control. El peso al destete a los ocho meses y ganancia de peso diario fue de 135_3, 138.1, 1260 Y 124 kg Y de OA18, OA08, 0.368 y de 0.355 kg/día respectivamente con diferencias significativas (P < 0.05, atribuyéndose el mejor desempeño de los terneros implantados a la mayor eficiencia alimenticia de su dieta compuesta por leche y pasto exclusivamente. A los 10,52, 100, 134, 158,294 y 253 días la respuesta es de tipo parabólico con relación al grupo control, la máxima respuesta se obtienen con 17 -B estradiol y zeranol reimplante a los 120 días. El tratamiento con zeranol experimentó una brusca caída a los 90-100 días al terminar su efecto ya lo largo del trabajo el comportamiento fue bajo y errático, atribuido a un desajuste endocrino. Desde el punto de vista biológico y económico los anabólicos son favorables en la cría de los terneros en los sistemas de producción de doble propósito predominantes en el país.In its first week of age 24 males calves from a dual purpose herd were implanted as follows: (1 6 with estradiol17- B (Compudose-200l, (2 6 with zeranol (Ralgro reimplanted 90 days later, 6 with a single dose of zeranol, and (4 6 calves as control group. The weaning weight at eight months of age, and the average daily gains were 135.3, 138.1, 126.0, and 124.0 kg and OA 18, OA08, 0.368 and 0.355 kg/day for groups 1, 2,3 and 4 respectively (P < 0.05. The better perfomance of the implanted groups was asigned to a greater feeding efficiency, due to a diet made of milk and grass exclusively. At 10, 52, 100, 134, 158, 294 y 253 days of age the response is of parabolic type in relation to the control group. The largest response are obtained with treatments (1 and (2. The treatment

Revisión de la técnica de doble torsión y del método experimental en materiales cerámicos

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de Aza, A. H.

2001-04-01

Full Text Available The double torsion test configuration has many advantages for the evaluation of subcritical crack growth parameters and fracture toughness. These advantages are: crack-length independence, four-point loading, simple specimen geometry and ease of precraking. However , a number of unresolved questions need to be answered about the double torsion specimen and experimental techniques involved in its use before this testing can be adopted as a standard. In this paper these questions are addressed, the analyses of the compliance and KI for the double torsion configuration are revised, and the load relaxation test in double torsion is examined in order to define the conditions under which de data are valid.

La técnica de doble torsión tiene numerosas ventajas a la hora de evaluar el crecimiento subcritico de grieta en un material cerámico. Estas ventajas, entre otras, son: independencia del factor de intensidad de tensiones, KI, con respecto a la longitud de grieta, configuración de carga en cuatro puntos y facilidad de prefisuracion. Sin embargo, aun hoy en día, algunas preguntas sobre esta técnica quedan sin respuesta. En el presente trabajo se hace referencia a estas cuestiones, se revisan las expresiones analíticas de la flexibilidad y el factor de intensidad de tensiones, KI, propuestas en la literatura científica para la configuración particular de la doble torsión, y se examina el método de trabajo experimental, ensayo de relajación de carga, tratando de definir las condiciones en las cuales los datos obtenidos son validos.

Metodología del cálculo directo de la estructura principal de un petrolero de doble casco mediante la aplicación de un programa de elementos finitos

OpenAIRE

Bustos Pérez, Alfonso

2011-01-01

Analizar el procedimiento de cálculo de la estructura de un buque petrolero de doble casco realizado empleando un programa de cálculo de estructuras de acuerdo con: Las reglas de construcción de la Asociación Internacional de Sociedades de Clasificación (IACS). Los procedimientos de cálculo directo, en concreto el método de elementos finitos. Escuela Técnica Superior de Ingeniería Naval y Oceánica

El proceso de urbanización en la cuenca del río Chillán y su capacidad adaptativa ante precipitaciones extremas

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Henríquez Ruiz, Cristian

2009-06-01

Full Text Available Chillan has been historically struck by hidro-meteorogical phenomenon, one of the most recent was in july, 2006. That generated large damages, victims and others lose. This shows the high vulnerability and low adaptive capacity of the watershed.

This paper shows the process of urbanization in the basin is analyzed the period 1976-2007 in Chillan city and its relationship in the change in the surface runoff. Though a significant little increase in the likely surface runoff is observed, the tendencies of urbanization, studies of flood and consequences of torrential haste, they show the territorial planning instruments to include importance that act in a preventive way and do not revive set against these phenomena

Chillán ha sido golpeado históricamente por fenómenos hidrometeorológicos, uno de los más recientes fue el de julio de 2006 que generó grandes daños, damnificados y víctimas fatales, lo que ha demostrado la alta vulnerabilidad y baja capacidad adaptativa de la cuenca. En esta investigación se analiza el proceso de urbanización en la cuenca de Chillán entre 1976-2007 y su relación en el cambio en la escorrentía superficial. Si bien se observa un aumento poco significativo en los montos de escorrentía estimados, las tendencias de urbanización, estudios de inundación y consecuencias de precipitaciones torrenciales, demuestran la importancia de contar con instrumentos de planificación territorial que actúen de manera preventiva y no reactiva frente a estos fenómenos.

Identificación e implementación de paquetes tecnológicos en ganadería vacuna de doble propósito: Caso Manabí-Ecuador

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Torres, Yenny; Rivas, José; De Pablos-Heredero, Carmen; Perea, José; Toro-Mujica, Paula; Angón, Elena; García, Antón

2014-01-01

El avance en los sistemas ganaderos se asocia a la implementación de tecnologías en la producción y a la mejora de sus ingresos. El objetivo del presente estudio fue la identificación e implementación de paquetes tecnológicos y su relación con los resultados productivos en vacuno de doble propósito de la provincia de Manabí, Ecuador en dos zonas climáticas: el Bosque seco tropical y el húmedo tropical. Se agrupan 25 tecnologías en seis paquetes tecnológicos (PT) seleccionadas mediante una met...

Mamoplastia de aumento en doble plano: una alternativa subfascial en la optimización de las indicaciones Breast augmentation in dual plane: a subfascial alternative towards optimizing indications

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O. D. Ventura

2008-12-01

Full Text Available Proponemos el Doble Plano en la cirugía de aumento mamario como una alternativa a las indicaciones de uso del plano subfascial. Presentamos 30 casos en los que se utilizan variantes de la técnica en doble plano y discutimos sus indicaciones y ventajas a la vez que describimos detalles de la técnica. Este método consiste en crear un bolsillo donde el implante queda cubierto por el músculo pectoral solamente en su tercio superior y por la fascia en el resto. Las proporciones de estos componentes se ajustan según las características anatómicas de cada caso. Las indicaciones de la técnica son las mamoplastias primarias, y más específicamente, las secundarias con ptosis, encapsulamiento o ripling.We propose Dual Plane tecnique in augmentative mammoplasty as an alternative for individual adjustment when using the subfascial plane. Thirty cases are presented in which a variation of the dual plane technique is used. Its indications, advantages and surgical highpoints are discussed. This method consists on a pocket where the implant is covered by the pectoral muscle only on its upper pole, and by the fascia on the rest of it. The percentages of this components are adjusted to the anatomical characteristics of each case. Indications of this technique are primary mammoplasties, and more precisely secondary ones with ptosis, contractile capsule or ripling.

EFECTO DE LA EPOCA DEL PARTO Y DEL SISTEMA DE AMAMANTAMIENTO SOBRE LA EFICIENCIA REPRODUCTIVA DE VACAS DEL SISTEMA DOBLE PROPÓSITO

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*Roger Salgado

2003-12-01

Full Text Available Se evaluó el efecto de la época del parto y el sistema de amamantamiento en la eficiencia reproductiva postparto devacas manejadas bajo el sistema de doble propósito en una finca ubicada en el municipio de Chinú Departamento decórdoba. Se utilizaron 60 vacas multíparas homogéneas en el número de partos, producción de leche, manejo, sanidad,ambiente y alimentación. Se distribuyeron en cuatro tratamientos utilizando un diseño completamente al azar, con unarreglo factorial 2x2 con dos épocas (sequía y lluvia y dos sistemas de amamantamiento (tradicional y restringido con 15repeticiones por grupo experimental: T1 – Sequía x tradicional – T2 – sequía x restringido - T3 – Lluvia x tradicional – T4– Lluvia x restringido. La época no tuvo efecto (P>0.05 sobre la tasa de gestación (50% para la época seca vs 40% parala época de lluvia ni los días abiertos (132.13 + 65.35 vs 138.71 + 60.21 para la época de sequía y lluvia respectivamente.Se encontró un efecto del amamantamiento sobre la tasa de gestación y los días abiertos (P<0.05, siendo mayorpara el amamantamiento restringido (70% y 109.00 + 52.93 días comparado con el tradicional (20% y 161.87 + 60.14días. Por otra parte, se determinó un efecto en la frecuencia acumulada de días abiertos, hallándose los mejoresresultados en los tratamientos T2 y T4 (P<0.016. El estudio permitió concluir que el amamantamiento reduce elanestro postparto y mejora la eficiencia reproductiva en bovinos manejados bajo el sistema de doble propósito.

Evidencias de grandes precipitaciones en diversas etapas constructivas de la Huaca de la Luna, costa norte del Perú

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1993-01-01

Full Text Available ÉVIDENCES DE GRANDES PRECIPITATIONS AU COURS DE DIFFERENTES ETAPES DE LA CONSTRUCTION DE LA HUACA DE LA LUNA, COTE NORD DU PEROU. Les recherches en cours à la Huaca de La Luna - Vallée de Moche ont permis d’établir une séquence de quatre événements constructifs majeurs, ainsi que diverses modifications à l’intérieur de chaque événement. Des sédiments contenant des fines couches de peinture blanche ont été trouvés sur les sols de ces divers événements constructifs et sont interprétés comme le résultat des pluies intenses. Celles-ci ont été produites par le Phénomène du El Niño. Ces nouvelles données permettront de réévaluer les interprétations historiques du site. Las investigaciones que venimos realizando en la Huaca de La Luna - Valle de Moche, han permitido establecer cuatro etapas constructivas, así como diversas modificaciones al interior de cada etapa. Capas de sedimentos conteniendo lentes de pintura, que han sido halladas sobre los pisos arquitectónicos, las interpretamos como el resultado de fuertes lluvias que han lavado el enlucido y la pintura de las paredes. Grandes precipitaciones en la costa norte sólo se dan cuando aparece el Fenómeno de El Niño. Estos nuevos datos permitirán reevaluar las interpretaciones históricas del sitio. EVIDENCES OF HEAVY RAINFALL IN SEVERAL BUILDING STAGES OF HUACA DE LA LUNA, COAST OF NORTHERN PERU. On-going research studies on the Huaca de La Luna (valle of Moche archaeological site lead us to distinguish four episodes of building, as well as several modification stages within each episode. Layers of sediment with remnants of paint that were found on successive floors of this site, are interpreted as evidence of intense rainfall events which were able to wash off the walls. This kind of heavy precipitation seems to be closely related to the El Niño phenomenon. These observations should help to re-calculate former historical interpretations o the site.

Identificación e implementación de paquetes tecnológicos en ganadería vacuna de doble propósito. Caso Manabí-Ecuador

OpenAIRE

Yenny Torres; José Rivas; Carmen De Pablos-Heredero; José Perea; Paula Toro-Mujica; Elena Angón; Antón García García

2014-01-01

El avance en los sistemas ganaderos se asocia a la implementación de tecnologías en la producción y a la mejora de sus ingresos. El objetivo del presente estudio fue la identificación e implementación de paquetes te cnológicos y su relación con los resultados productivos en vacuno de doble propósito de la provincia de Manabí, Ecua dor en dos zonas climáticas: el Bosque seco tropical y el húmedo tropical. Se agrupan 25 tecnologías en seis paquetes tecnológicos (PT) seleccionadas mediante una m...

Transculturación y la diferencia colonial. Doble traducción

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Freya Schiwy

2007-01-01

Full Text Available En el marco del concepto wallersteineano de sistema mundo moderno/colonial –como fue modificado por Mignolo (2000- los autores abordan el problema de la traducción/transculturación. Misioneros y antropólogos en África, Asia y Mesoamérica solían realizar traducciones unidireccionales determinadas por los intereses metropolitanos con el fin de propiciar la asimilación y la conversión. La traducción fue, ciertamente, el proceso por el cual la colonialidad del poder articuló la diferencia cultural. Pero complejos mecanismos de reciprocidad, como el “translengüeo” podrían operar con el objetivo de trasladar conocimiento, emociones o memorias desde las cosmologías amerindias o subalternas a través del español o cualquier otro idioma colonial, como los Zapatistas han llevado a cabo. Para el subcomandante Marcos, la traducción no es meramente interlingüística sino también intercosmológica. Los autores proponen varios ejemplos de traducción/transculturación entre español y Tojolabal o Aymara para mostrar ese complejo y doble movimiento.In the frame of the Wallersteinean concept of modern/colonial world system –as modified by Mignolo (2000- the authors address the topic of translation/transculturation. Missionaries and anthropologists in Africa, Asia and Mesoamerica used to make one-way translations determined by metropolitan interests for the purposes of assimilation and conversion. Translation was indeed the process wherein the coloniality of power articulated the colonial difference. But complex mechanisms of reciprocity, as translanguaging, could operate in order to convey knowledge, emotions or memories from Amerindian or subaltern cosmologies through Spanish or any other colonial languages as the Zapatistas have performed. For “subcomandante” Marcos, translation is not merely interlinguistic but also intercosmological. The authors go through several examples of translation/transculturation between Spanish and

Un análisis del escenario económico del Perú y Chile, desde la perspectiva del doble diamante de la competitividad global

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Jesús C. Peña-Vinces

2009-11-01

Full Text Available Las pequeñas economías, como la peruana y chilena, se encuentran inmersas en la arena global de las economías emergentes, por lo que evaluarlas desde un punto de vista puramente local (Porter1990 sería un enfoque bastante limitado y poco útil. Este hecho hace que el diamante nacional de Porter (1990 resulte, a todas luces, insuficiente para dicho propósito (Moon et al. 1998: 135. Este artículo analiza las economías mencionadas desde un enfoque más global, que incluye tanto el mercado local como el extranjero; es decir, evaluarlo desde la perspectiva del doble diamante de la competitividad internacional propuesta por Moon et al. (1998, y Moon y Lee (2004: 138.

Identificación e implementación de paquetes tecnológicos en ganadería vacuna de doble propósito. Caso Manabí-Ecuador

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Yenny Torres

2014-01-01

Full Text Available El avance en los sistemas ganaderos se asocia a la implementación de tecnologías en la producción y a la mejora de sus ingresos. El objetivo del presente estudio fue la identificación e implementación de paquetes te cnológicos y su relación con los resultados productivos en vacuno de doble propósito de la provincia de Manabí, Ecua dor en dos zonas climáticas: el Bosque seco tropical y el húmedo tropical. Se agrupan 25 tecnologías en seis paquetes tecnológicos (PT seleccionadas mediante una metodología cualitativa y participativa. Se realizaron entrevistas en una muestra de 41 explotaciones para evaluar la implementación de los paquetes tecnológicos, mediante estadística desc riptiva, correlaciones de Sperman y regresiones múltiples. Se obtienen los mayores niveles de implementación en los paquetes de salud animal (76 %, uso de la tierra y alimentación (55 %. El PT de alimentación se correlacion a ( P <0.01 con el PT de instalaciones (0.711 y de reproducción (0.774. Los PT explican 30 % de la variabilidad de la producción de leche, que es debida al uso de la tierra en el Bosque seco y a la salud animal en el Bosque húmed o. Esta investigación genera resultados preliminares respecto a la idententificación e implementación de los principales paquetes tecnológicos en la ganadería vacuna de doble propósito de Manabí – Ecuador, que están en pr oceso de mejora aunque sin perder los atri butos que lo caracterizan.

Efectos de cruzamiento para producción de leche y características de crecimiento en bovinos de doble propósito en el trópico húmedo

OpenAIRE

Sergio Iván Román-Ponce; Felipe de Jesús Ruiz-López; Hugo H. Montaldo; Rita Rizzi; Heriberto Román-Ponce

2013-01-01

Con el objetivo de evaluar los efectos de cruzamiento en tres subpoblaciones de ganado bovino cruzados de doble propósito en el trópico húmedo se utilizaron 5,040 lactancias y pesajes corporales al nacimiento [4,429] y pesos ajustados a 205 [3.878], 365 [3,017] y 540 [2,276] días (PN, P205, P365 y P540, respectivamente) de Cebú (CE) y sus cruzas con Holstein (HS), Suizo Pardo (SP) y Simmental (SM). Los efectos aditivos directos de raza (PG), heterocigocidad (HT) y pérdidas por recombinación (...

EEES, COMPETENCIAS Y APRENDIZAJE DEL DERECHO ROMANO MEDIANTE EL MÉTODO DEL CASO (I: EL DOBLE MATRIMONIO

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Elisa Muñoz Catalan

2013-01-01

Full Text Available Con la realización del presente trabajo pretendemos investigar sobre la importancia actual de aplicar el método del caso en la enseñanza del Derecho Romano, frente a las tradicionales clases teóricas y magistrales. Reparando, muy especialmente, en el alcance de las exigencias metodológicas surgidas con los nuevos planes del estudio Grado en Derecho en el marco del EEES; así como en el desarrollo de una serie de competencias generales y específicas en los estudiantes, que les van a ser muy útiles una vez que finalicen el Grado y se enfrenten a las dificultades del mercado actual, ya que se consideran como los verdaderos protagonistas del proceso de enseñanza-aprendizaje. Por tanto, con la puesta en práctica de este primer caso sobre doble matrimonio romano, ausencia de testamento y herederos legítimos, intentamos acercar al alumnado al casuismo jurisprudencial romano; de este modo, comprenderán que lo importante no es dar la solución al supuesto planteado, sino razonar jurídicamente consiguiendo, a través de debates en grupos, un conocimiento más profundo de las reglas e instituciones aplicables.

Análisis no lineal de mallas espaciales de doble capa

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Estévez Cimadevila, Francisco Javier

1991-04-01

Full Text Available This paper is related to the topic developed in my RH.D. thesis. A new model is proposed to describe the non-linear behaviour of straight pin-jointed compression members. Sucti a method Is based upon obtaining the complete constitutive equations in the case of circular hollow sections. The stability functions of imperfect bars and the analytical formulation of the post-buckiing behaviour are obtained by taking the exact expression of the curvature in the integratlon of the differential equation of the elastic. The linearization of the constitutive relationships and the application of an incremental iterative model based upon the modification of the elasticity of the bars at critical point allows us to consider the non-linear analysis of the double layer space grids. The models of analysis proposed here have been applied to a wide variety of trusses with different characteristics and typologies, some examples of which accompany this paper.

Este artículo corresponde al tema de investigación desarrollado en mi tesis doctoral. Se plantea un nuevo modelo para describir el comportamiento no lineal de piezas rectas biarticuladas sometidas a compresión, basado en la obtención de las ecuaciones constitutivas en el caso de los perfiles tubulares huecos de sección circular. Se obtienen las funciones de estabilidad de barras imperfectas y la formulación analítica del comportamiento postpandeo tomando la expresión exacta de la curvatura en la integración de la ecuación diferencial de la elástica. La linearización de las leyes constitutivas y la aplicación de un modelo incremental Iterativo basado en la modificación del módulo de elasticidad de las barras en estado crítico permite abordar el análisis no lineal de las mallas espaciales de doble capa. Los modelos de análisis propuestos se aplicaron a una amplia variedad de mallas de diversas tipologías y características de las que se acompañan algunos ejemplos en el artículo.

ESTUDIO INTRAPAÍSES DE LA COMPETITIVIDAD GLOBAL DESDE EL ENFOQUE DEL DOBLE DIAMANTE PARA PUERTO RICO, COSTA RICA Y SINGAPUR

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Castro-Gonzáles, Segundo

2014-09-01

Full Text Available Muchos investigadores y economistas han argumentado que los estudios de competitividad del WEF e IMD muestran limitaciones en pequeñas economías,más aún cuando estas tienen características distintas. El objetivo de esta investigación es estudiar la competitividad de 3 peque˜nas economías: Puerto Rico, Costa Rica y Singapur. El modelo del doble-diamante de competitividad resulta útil a la hora de llevar a cabo esta tarea. La información procede de organismos internacionales. Los resultados muestran que Singapur goza de un mayor nivel de competitividad global comparado con Puerto Rico y Costa Rica. Concluimos que Puerto Rico y Costa Rica lucen equilibrados en competitividad, porque internacionalmente Puerto Rico aventaja a Costa Rica en 3 determinantes: condiciones de factores, condiciones de la demanda e industrias relacionadas y de apoyo; mientras que localmente Costa Rica es más competitivo que Puerto Rico en 3 factores domésticos: condiciones de factores, condiciones de demanda y estrategia de las firmas.

UNA APROXIMACIÓN TEÓRICA A LA VALORACIÓN DEL DOBLE AJUSTE EN EL DISEÑO DE LA ESTRATEGIA DE RECURSOS HUMANOS

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García Carbonell, Natalia

2013-05-01

Full Text Available Tradicionalmente la literatura ha considerado la necesidad del doble ajuste, vertical y horizontal, de la estrategia de recursos humanos en las organizaciones. Su importancia estratégica ha sido demostrada en buena parte de los estudios empíricos planteados. Sin embargo, la complejidad de este proceso requiere de un análisis más profundo que permita identificar los elementos que lo hacen posible. En el presente trabajo, partiendo de la revisión de la literatura de las perspectivas de investigación en dirección estratégica de recursos humanos y del concepto «fortaleza del sistema de recursos humanos» propuesto por Bowen y Ostroff (2004, discutimos los 3 factores que integran dicho concepto y su relación con el ajuste del sistema. Como consecuencia de ello, definimos 3 proposiciones teóricas que explican la vinculación entre ambas dimensiones y la fortaleza del sistema.

The Possibility of Making a Quantitative Study of the Precipitin Reaction by Gamma-Radioactive Tracers; Possibilite d'une Etude Quantitative de la Reaction de Precipitation par Marquage a l'Aide d'Emetteurs Gamma; Vozmozhnost' kolichestvennogo opredeleniya reaktsii osazhdeniya s pomoshch'yu gamma-radioaktivnykh indikatorov; Estudio Cuantitativo de la Reaccion de Precipitacion con Ayuda de Indicadores Gamma

Energy Technology Data Exchange (ETDEWEB)

Bonev, L.; Todorov, S.; Robev, S. [Nauchno-Issledovatel' skij Institut Radiologii i Radiacionnoj Bezopasnosti, Sofija (Bulgaria)

1965-10-15

The paper presents the first results of the quantitative determination of the precipitin reaction (formation of an antigen-antibody complex) by labelling the precipitating components with gamma-radioactive tracers which do not chemically interact with albuminous molecules. As tracers it is possible to use chrome-manganese and nickel-copper compounds, whose tendency to hydrolyze permits the fixation of the radioactive tracer on the antigen and antibody respectively. The radioactivity of the components is determined by a multichannel pulse-height analyser. The results obtained show that the precipitation curve, plotted on the basis of radiometric data, closely corresponds to the curve plotted by the well-known quantitative methods used to determine albumin. The paper discusses the possibilities of using the method described. (author) [French] Les auteurs communiquent les premiers resultats d'une etude quantitative qu'ils ont faite de la reaction de precipitation (formation du complexe antigene-anticorps) en marquant les composants du precipites avec des emetteurs gamma qui ne reagissent pas chimiquement avec les molecules d'albumine. Pour le marquage, on peut utiliser des composes de chrome/manganese ou de fer qui subissent facilement l'hydrolyse et assurent de ce fait la fixation de la substance radioactive sur l'antigene et, partant, sur l'anticorps. La radioactivite des composants est determinee a l'aide d'un selecteur d'amplitudes a plusieurs canaux. Les resultats montrent que la courbe de precipitation obtenue avec les donnees radiometriques concorde parfaitement avec celle que l'on obtient par les methodes quantitatives connues servant au dosage de l'albumine. Les auteurs discutent les possibilites d'application de la methode etudiee. (author) [Spanish] Los autores presentan los primeros resultados de un estudio cuantitativo de la reaccion de precipitacion (formacion del complejo antigeno-anticuerpo) que efectuaron marcando los componentes de precipitacion con

Hidrología, 2010-11

OpenAIRE

Sánchez San Román, Francisco Javier

2010-01-01

I. Materiales de clase: 1. El Ciclo Hidrológico. 2. Precipitaciones. 3. Evapotranspiración. 4. Hidrología Superficial (I): Medidas y Tratamiento de los datos. 5. Hidrología Superficial (II): Hidrogramas. 6. Hidrología Superficial (III): Relación Precipitación - Escorrentía. 7. Conceptos Fundamentales de Hidrogeología. 8. Flujo en medios porosos: Ley de Darcy. 9. Hidráulica Subterránea: Principios Básicos. 10. Hidráulica de captaciones: Fundamentos. 11. Hidroquímica. Conceptos Fundamentales. 1...

Reconstrucción de rodilla con doble colgajo de gemelo Knee reconstruction with double gemelar muscular flap

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C. Márquez Zevallos

2011-06-01

Full Text Available Los traumatismos de miembros inferior representan un reto importante para el cirujano plástico en cuanto a su reconstrucción cuando no se dispone de técnicas microquirúrgicas. En el presente trabajo se presentan 2 casos de reconstrucción de rodilla con doble colgajo muscular de gemelo, en los que se demuestra que se pueden utilizar simultáneamente los dos gemelos sin dejar ninguna secuela estética importante ni funcional en la deambulación de los pacientes. Hasta donde podemos conocer, no existe en la literatura nacional ni internacional un reporte de casos con esta aplicación, ya que siempre se ha empelado un solo músculo precisamente por el temor a alterar la función de flexo-extensión del pie.Lower limb traumatism has always been a problem for plastic surgeon when in the moment of the surgical reconstruction we have not microsurgical techniques. In this paper, we present 2 cases of knee reconstruction using a double gemelar muscular flap, showing how is possible the simultaneous use of the two muscles without aesthetic or functional sequels. As we know, there is no national or international report of cases with this muscular reconstruction; it has been usual to use only one muscle, in order to avoid problems in the flexo-extension movements of the foot.

Efecto del régimen de defoliación sobre la producción de grano en trigo doble propósito Effect of the defoliation regime on grain production in dual purpose wheat

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N. Peralta; P.E. Abbate; A. Marino

2011-01-01

La utilización de cultivos de trigo con doble propósito contribuiría a realizar un uso más eficiente de los recursos ambientales. En Balcarce (Buenos Aires, Argentina) se estableció un cultivo de trigo (Triticum aestivum, cv. Baguette 20) sembrado en fecha temprana (17 de marzo de 2006) para comparar la producción de forraje obtenida con tres regímenes de defoliación: T1 (tres defoliaciones), T2 (dos defoliaciones) y TG (sin defoliaciones). En esos tres tratamientos y en otro no defoliado sem...

CARACTERIZACIÓN SOCIOECONÓMICA Y TECNOLÓGICA DE LOS AGROECOSISTEMAS CON BOVINOS DE DOBLE PROPÓSITO DE LA REGIÓN DEL PAPALOAPAN, VERACRUZ, MÉXICO

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Julio Vilaboa-Arroniz

2008-12-01

Full Text Available El objetivo del presente trabajo fue caracterizar los componentes tecnológicos y socioeconómicos en los agroecosistemas con bovinos de doble propósito de la Región del Papaloapan, Veracruz, México. Se diseño y aplicó entrevistas semi-estructuradas a productores en las Asociaciones Ganaderas Locales y en ranchos ganaderos de los 21 municipios de la región objeto de estudio. Las variables incluidas fueron sociales, técnicas y de comercialización. El tamaño de muestra fue de 405 productores que representan el 4% del total de los ganaderos de la región. Se utilizó el análisis cluster, estadística descriptiva y tablas de contingencia. El análisis cluster, de acuerdo a las variables consideradas, permitió caracterizar a los productores en tres grupos: tradicional, de transición y empresarial. La edad para estos grupos de ganaderos fue 53±13, 54±15 y  56±12 años, y las cargas animal fueron 42.8±38.9, 154.1±88.3 y 123.8±93.5, respectivamente. En general, la finalidad zootécnica fue ganado doble propósito (86.9%, con pastoreo extensivo a libre pastoreo (98% como el sistema predominante y un patrón racial de la cruza Suizo x Cebú (79.8% como el más representativo.

La Primera Muestra de Contabilidad por Partida Doble en la Catedral de Toledo. El Manual y Mayor del Racionero Gutierre Hurtado (1535-1536

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Susana Villaluenga de Gracia

2005-06-01

Full Text Available En la línea de las investigaciones desarrolladas sobre la contabilidad de las instituciones eclesiásticas en España, este trabajo estudia la que en el siglo XVI fue considerada la sede más rica de la Cristiandad después de Roma, la Catedral de Toledo. Su elevado estatus pudo ser una cuestión significativa para influir en el proceso de desarrollo de su sistema de gestión y en la adopción de prácticas contables novedosas. Además, dentro de la catedral existían beneficiados con aptitudes para dar solución a cualquier cuestión económica. Más concretamente, uno de ellos, el racionero Gutierre Hurtado, fue el autor de la primera muestra de contabilidad por partida doble en la catedral de Toledo y la primera muestra conocida, hoy por hoy, en el mundo para una entidad eclesiástica. En este trabajo se muestran algunos fragmentos sobre su vida y cometido; y los aspectos generales y especiales que caracterizan el método contable usado por este racionero. Para ello, examinaremos los documentos que se conservan en el Archivo de la Catedral de Toledo Palabras clave: Contabilidad eclesiástica, partida doble, catedral de Toledo.Through an approach close to the research of the studies on accounting of the religious organizations in Spain, this paper intends to study an entity that was considered the richest see of Christendom after Rome in the 16th century, the Cathedral of Toledo. Its highest level could possibly have been a significant element in the development of sophisticated management and accounting practices in this church. In addition, acting at the cathedral of Toledo, there were men who were capable to manage any economic question. More specifically, one of these prebendaries, Gutierre Hurtado, was the author of the first accounting demonstration for double entry in the cathedral of Toledo and the first one that is known, at the present time, in a religious organization on the world. This paper will show some features of all what we

Estimación de parámetros genéticos para características productivas y reproductivas en los sistemas doble propósito del trópico bajo colombiano

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A. P. Galeano

2010-01-01

Full Text Available Con el objetivo de estimar los componentes de varianza, las heredabilidades, repetibilidades y correlaciones genéticas y fenotípicas para la producción de leche por lactancia (PL, el peso al destete (PD, el intervalo entre partos (IEP y el Índice de Vaca (IV, de las hembras bovinas manejadas en los sistemas de producción de doble propósito del trópico bajo colombiano, se analizaron los registros productivos y reproductivos de 1.687 vacas registradas en la Asociación Colombiana de Criadores de Ganado en Doble Propósito (Asodoble, durante el periodo comprendido entre 1998 y 2007. Se empleó un modelo animal mixto que incluyó los efectos fijos del grupo contemporáneo (finca-sexo-época-año, la composición racial, y la duración de la lactancia como covariable; así como los efectos genéticos aleatorios del animal, el medio ambiente permanente y el residual. Las heredabilidades estimadas para IEP (0,04 y PD (0,11 fueron bajas, y moderadas para PL (0,35 e IV (0,24, respectivamente. La repetibilidad estimada para IEP fue baja (0,08, y para PL (0,41 e IV (0,31 moderada; en el caso de PD este valor fue igual a la heredabilidad (0,11. Las correlaciones genéticas y fenotípicas obtenidas entre PL y PD con respecto a IEP fueron positivas, y se determinó una asociación genética negativa entre PL y PD. Los resultados demostraron que el IV es un buen indicador, desde el punto de vista genético, de la eficiencia productiva y reproductiva de los animales manejados en estos sistemas productivos.

Estimación de parámetros genéticos para características productivas y reproductivas en los sistemas doble propósito del trópico bajo colombiano

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A. P. Galeano

2010-06-01

Full Text Available Con el objetivo de estimar los componentes de varianza, las heredabilidades, repetibilidadesy correlaciones genéticas y fenotípicas para la producción de leche por lactancia(PL, el peso al destete (PD, el intervalo entre partos (IEP y el Índice de Vaca (IV,de las hembras bovinas manejadas en los sistemas de producción de doble propósitodel trópico bajo colombiano, se analizaron los registros productivos y reproductivosde 1.687 vacas registradas en la Asociación Colombiana de Criadores de Ganado enDoble Propósito (Asodoble, durante el periodo comprendido entre 1998 y 2007. Seempleó un modelo animal mixto que incluyó los efectos fijos del grupo contemporáneo(finca-sexo-época-año, la composición racial, y la duración de la lactancia comocovariable; así como los efectos genéticos aleatorios del animal, el medio ambientepermanente y el residual. Las heredabilidades estimadas para IEP (0,04 y PD (0,11fueron bajas, y moderadas para PL (0,35 e IV (0,24, respectivamente. La repetibilidadestimada para IEP fue baja (0,08, y para PL (0,41 e IV (0,31 moderada; en el casode PD este valor fue igual a la heredabilidad (0,11. Las correlaciones genéticas y fenotípicasobtenidas entre PL y PD con respecto a IEP fueron positivas, y se determinóuna asociación genética negativa entre PL y PD. Los resultados demostraron que el IVes un buen indicador, desde el punto de vista genético, de la eficiencia productiva yreproductiva de los animales manejados en estos sistemas productivos.

El doble y el espejo en Cisne negro (Darren Aronofsky, 2010. The double and the mirror in Black Swan (Darren Aronofsky, 2010

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Ana España

2012-04-01

Full Text Available Con su último largometraje, Cisne negro (2010, Darren Aronofsky propone una nueva visión de su cine de la obsesión, a través del proceso de autodestrucción de una bailarina, sumergida en su afán por encarnar el papel principal en una obra de ballet.El presente artículo trata de abordar el tratamiento que el director realiza del fenómeno del doble, como vehículo sobre el que se sustenta la crisis obsesiva de la protagonista, atendiendo a sus diversas representaciones y objetivos en la configuración final del texto. With his latest film, Black Swan (2010, Darren Aronofsky offers a new vision of his obsession cinema, through the process of self-destruction of a dancer, immersed in her effort to embody the lead role in a ballet performance. This current article aim to attend the director treatment of the double phenomenon as a vehicle on which rests the obsessive crisis of the protagonist, according to their several representations and objectives in the final configuration of the text.

Fracaso renal agudo secundario a combinación de inhibidores del sistema renina-angiotensina, diuréticos y AINES. “La Triple Whammy”1

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Rosa Maria Garcia Camin

2015-03-01

Conclusiones: El tratamiento con IECA, ARA II, diuréticos y/o AINES presenta elevada incidencia de ingreso por FRA, siendo los diuréticos en monoterapia, doble y triple terapia combinada los que ocasionan la mayor incidencia. El FRAETW supone elevados costes sanitarios y muertes evitables.

¿Doble reaseguro o doble inestabilidad?: El papel de EEUU en Asia y el conflicto por las islas Senkaku/Diaoyu

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Gracia Abad

2016-05-01

Full Text Available Durante décadas, tras la II Guerra Mundial, EEUU ha jugado un papel clave en la seguridad de Asia Pacífico como estabilizador exterior.En el contexto actual de lucha por la hegemonía en Asia entre los propios Estados Unidos y la República Popular de China, esa situación puede estar cambiando. Así parece ponerse de manifiesto en los distintos conflictos planteados en la región y, en concreto, en el de las islas Senkaku/Diaoyu entre la República Popular de China y Japón, aliado en el área de Estados Unidos

Identificación paramétrica en lazo cerrado de sistema de accionamiento neumático para cilindro de doble efecto

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Oscar Caldas Flautero

2013-01-01

Full Text Available Los modelos matemáticos que permiten comprender un sistema y predecir o simular su comportamiento suelen presentar inconvenientes cuando se cuenta con poca información a priori o se desconocen los parámetros físicos. Por esa razón, en este trabajo se presenta la identificación de sistemas como estrategia para abordar la construcción de modelos dinámicos complejos, proponiendo soluciones para tratar el comportamiento no-lineal de un sistema neumático, representado por un actuador de doble efecto y un par de válvulas proporcionales para el control de la presión de alimentación y el caudal. Se presenta una aproximación almodelomatemático para determinar el orden del sistema, la identificación en lazo abierto y lazo cerrado y la comparación entre modelos de procesosARX yARMAX, con diferente orden, para concluir con simulaciones comparativas entre la respuesta del sistema real y la del identificado.

Reacciones de adición a 1,1-BIS (Difenilfosfino) eteno activada por coordinación en compuestos ciclometalados de Pd(II) : complejos de metales de transición con disfosfinas funcionalizadas

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Mosteiro Taboada, Roberto

2016-01-01

[Resumen] El trabajo consta de dos partes. La primera estudia la reactividad del doble enlace vinílico de la difosfina 1,1 bis (difenilfosfino)eteno (vdpp) frente a diferentes nucleófilos cuando ésta se encuentra coordinada actuando como ligando bidentado quelato en compuestos ciclometalados. Si bien el doble enlace del grupo vinílico de las fosfina libre presenta una reactividad muy limitada, la coordinación al metal produce su activación permitiendo llevar a cabo reaccion...

El método de la caxa entera de Juan Bautista de Herrera (1628: una visión peculiar de la partida doble? = The caxa entera method of Juan Bautista de Herrera (1628: A particular overview of double-entry bookkeeping?

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José Julián Hernández Borreguero

2012-01-01

Full Text Available Juan Bautista de Herrera fue contador del Cabildo Catedral de Sevilla a principios del siglo XVII. En uno de esos libros realiza una introducción en la que explica la utilidad del método de la partida doble, así como los argumentos de cómo debía implantarse el nuevo método. El estudio de dichos argumentos se ha realizado tomando como referencia el primer tratado de contabilidad español escrito por Bartolomé Salvador de Solórzano (1590 dado que este recoge las características y esencia de la partida doble castellana en ese período. A continuación comienza el registro de hechos contables sin recurrir a un libro diario.Juan Bautista de Herrera was an accountant of the Cathedral Council of Sevilla at the beginning of 17th century. In one of these books Herrera made an introduction explaining the usefulness of the double-entry bookkeeping method and argued how to implement it. The aim of this paper is to analyse his arguments using Bartolome Salvador de Solorzano´s approach. Solorzano wrote the first Spanish accounting treatise in 1590, where he compiled the characteristics and essence of Spanish double-entry bookkeeping in this period. Herrera recorded in this book without using a daybook.

Suplementación con balanceado comercial en crías vacunas lactantes bajo sistema doble propósito

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Esperanza Prieto M.

2010-12-01

Full Text Available Objetivo. Evaluar el efecto que ejerce la suplementación con alimento balanceado sobre la ganancia diaria de peso (GDP y el consumo de alimento (CA en terneros lactantes y su impacto económico en una empresa ganadera manejada bajo un sistema vacuno de doble propósito, en el municipio de Sincé, Sucre–Colombia. Materiales y métodos. Se suplementaron 14 crías (6 machos y 8 Hembras entre 3 y 5 meses de edad, con alimento balanceado comercial al 1.5% del peso vivo (Tratamiento 1 y se compararon con un grupo igual sin suplementar (Tratamiento Testigo, durante 113 días en época de lluvias. La GDP y CA fueron evaluados mediante prueba t de Student. Se determinó Relación beneficio: costo y rentabilidad. Resultados. La GDP de las crías lactantes fue afectada de manera altamente significa por la suplementación con alimento balanceado comercial (p0.05, encontrándose el mismo resultado para el consumo de alimento balanceado (p>0.05 explicando así la no diferencia estadística en la GDP entre sexos. El análisis económico confirmó que la estrategia alimenticia es viable al presentarse una relación B:C del 1.1. y una rentabilidad trimestral del 9.27%. Conclusiones. La suplementación de terneros lactantes es una práctica viable, que permite obtener ganancias adicionales.

Rotura del Bíceps Distal. Evaluación de resultados con técnica de doble fijación. [Distal biceps rupture: evaluation of results with double fixation technique

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Miguel Ángel Capomassi

2013-11-01

Full Text Available In­tro­duc­ción La rotura del bíceps distal es una lesión poco frecuente producida por la aplicación de una fuerza excéntrica sobre el codo flexionado. El objetivo de este trabajo es analizar los resultados obtenidos para la reinserción del bíceps distal mediante técnica de doble fijación con botón de anclaje cortical y tornillo interferencial de biotenodesis a través de una incisión anterior única. Materiales­ y­ Métodos Entre agosto de 2008 y febrero de 2013, registramos 19 casos de rotura del bíceps distal tratados quirúrgicamente por vía anterior limitada. Los 17 últimos casos consecutivos fueron tratados con doble fijación utilizando botón extracortical y tornillo de biotenodesis, y forman parte del estudio. Todos eran hombres, con una mediana de la edad de 41 años (rango 27-59. Los pacientes fueron evaluados con el Cuestionario DASH y el Puntaje Subjetivo/Objetivo de Andrews y Carson, y la fuerza de flexión y supinación se controló con la escala del British Medical Research Council modificada por Mackinnon y Dellon (M0-M5. Resultados El cuestionario DASH arrojó un valor mediano de 1,7 (0-5,83 y el de Andrews y Carson, de 195 (170-200 para el total; con 15 resultados excelentes y 2 buenos. Todos consiguieron una fuerza M5 para flexión y supinación de antebrazo. El seguimiento tuvo una mediana de 12 meses (4-32. En dos pacientes, se registraron complicaciones, ambas con recuperación ad íntegrum. Conclusión La técnica descrita ha demostrado ser confiable y eficaz, y permitió lograr resultados satisfactorios y una baja tasa de complicaciones.

Effect of Quantity and Distribution of Rainfalls on Hordeum murinum L. Growth and Development Efecto de la Cantidad y Distribución de las Precipitaciones en el Crecimiento y Desarrollo de Hordeum murinum L.

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Myrna Johnston B

2009-06-01

Full Text Available The growth and development of Hordeum murinum L. seeds growing with extreme pluviometric regimes in cool greenhouse conditions were evaluated. Seven treatments according to quantity and distribution of real rainfalls of the semiarid zone of the Metropolitan Region, Chile were applied: rainy-late, normal-late, dry-early, rainy-normal, normal-early and dry-late, plus a reference without water stress, at 2/3 field capacity. The experimental design was randomized complete blocks with five replicate pots. Seeds produced in the last year were sown in pots with disinfected soil leaving the more uniform plants after emergence. Evaluations were made of phytomass production, spearing shoots of roots, the quantity of floral stems and seeds, their total weight and the proportion of seed annex structures, and the viability and germination capacity of seeds. The life cycle of dry years was shortest and with the least dry shoot matter production, the rainy-normal and normal-late years had similar dry root matter production, therefore the most important factor was rainfall distribution. All the reproductive growth values were lower than the reference. There was no seed production in both distributions of dry years and in the normal-early. There were only differences in late distributions, there were no differences among treatments in seed quality. Thus, H. murinum uses its resources principally for seed production and late distributions determined seed production.Se evaluó el desarrollo de plantas de Hordeum murinum sometidas a regímenes pluviométricos simulados en invernadero frío. En un diseño de bloques completos al azar con cinco repeticiones, se establecieron tratamientos según cantidad y distribución de las precipitaciones reales del secano de la Región Metropolitana, Chile: lluvioso-tardío, normal-tardío, seco-temprano, lluvioso-normal, normal-temprano, seco-tardío y uno de referencia sin restricción hídrica. Se sembraron semillas del a

Fauna silvestre asociada a ganado vacuno doble propósito en sistema de silvopastoreo, Pinto, Magdalena, Colombia

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Jaime De La Ossa V.

2011-12-01

Full Text Available Objetivo. Evaluar la biodiversidad faunística asociada a ganadería vacuna de doble propósito en dos potreros estructurados con Botriochloa pertusa (colosoana como herbácea dominante, uno de ellos plantado con Crescentia cujete (Bignoniaceae como fuente de alimento adicional y otro con escaso y disperso arbolado. Materiales y métodos. El área de estudio está ubicada en el municipio de Pinto, Magdalena. Cada potrero evaluado fue de 10 ha, se mantuvo en cada uno un lote de quince vacas (½ Cebú, ¼ Pardo y ¼ Costeño con Cuernos, la separación entre las áreas muestreadas fue de 500m. Los registros de fauna se condujeron mediante punto fijo de conteo, en diez sitios de avistamiento, durante 20 días continuos, con cubrimiento visual amplio. Al ganado vacuno adulto presente en las dos áreas de trabajo se le realizó un pesaje individual al inicio del trabajo y al final del mismo, con el fin de determinar posibles diferencias entre ellos. Resultados. Estadísticamente el número de individuos y el número de especies presentaron diferencias significativas, siendo mayor la diversidad biológica para el potrero que poseía la plantación de C. cujete, mientras que el peso corporal de las vacas sometidas a pastoreo en las dos áreas no presentó diferencias significativas. Conclusiones. Se demuestra la importancia de este modelo pecuario como promotor de la conservación faunística local al convertirse enrefugio de variadas especies silvestres, al tiempo que mantiene la productividad existente sin alterar el ambiente sustancialmente.

Síntesis de microcápsulas de poliurea a partir de aminas renovables, mediante doble emulsificación Synthesis of polyurea microcapsules from renewable amines by double emulsification

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Paula Mazo

2011-01-01

Full Text Available En este trabajo se realizó la microencapsulación de un perfume comercial mediante una doble emulsificación, la coraza de poliurea fue sintetizada por la reacción de Lisina con dos diisocianatos comerciales, uno aromático y otro alifático. En la síntesis se evaluó el efecto que tiene la relación molar amina:diisocianato y el tipo de emulsificante. Se optimizó el tamaño de partícula utilizando un diseño factorial 32 y análisis de superficie de respuesta, las variables fueron: cantidad de alcohol polivinílico y la relación de fase dispersa a fase continua. Las microcápsulas se caracterizaron mediante: análisis de calorimetría diferencial de barrido (DSC, espectroscopía infrarroja (IR, microscopía electrónica de barrido (SEM y tamaño medio de partícula. La doble emulsificación permite un mayor rendimiento de encapsulación del perfume, las micropartículas presentan un menor tamaño de partícula cuando: se emplea diisocianato aromático, un aumento de coloide protector (PVA y una disminución de la fase dispersa.This paper reports on the microencapsulation of a commercial perfume by means of a double emulsification, where the polyurea shell was synthesized by the reaction of lysine with two commercial di-isocyanates (aromatic and aliphatic. In the synthesis the factors evaluated were the amine:di-isocyanate molar ratio and the type of emulsifier. The particle size was optimized using a 3² factorial design and response surface analysis, with the following variables: amount of polyvinyl alcohol and the relationship of the disperse phase to continuous phase. The microcapsules were characterized using differential scanning calorimetry analysis (DSC, infrared spectroscopy (IR, scanning electron microscopy (SEM and mean particle size. The double emulsification allows for a greater yield in the encapsulation of perfume. Furthermore, the microparticles have a smaller particle size when the aromatic di-isocyanate was used, also

Análisis de posibles cambios a través del tiempo en la ocurrencia, intensidad y magnitud de la precipitación para tormentas extremas sobre la ciudad de Bogotá

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Losada Moncada, Jonathan Mauricio

2015-01-01

Se analizaron varios índices de precipitaciones extremas basados en los datos de precipitaciones observadas en 21 estaciones meteorológicas operadas por el Instituto de Hidrología, Meteorología y Estudios Ambientales (IDEAM), a la Corporación Autónoma Regional de Cundinamarca (CAR) y a la Empresa de Acueducto y Alcantarillado de Bogotá (EAAB-ESP) sobre la ciudad de Bogotá, entre los años de 1982 y 2013. Se trabajaron 13 índices de precipitación extrema propuestos por la Junta CCI/CLIVAR/ CMOM...

Algunos criterios para la predicción de las situaciones PREVIMET en el G.P.V. de Valencia

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Alcover Ronda, Víctor; Tamayo, Jorge; Palacios, Miguel

1996-01-01

Ponencia presentada en: III Simposio Nacional de Predicción del Instituto Nacional de Meteorología, celebrado en 1996 en Madrid El objetivo de esta guía Iza sido establecer unos criterios mínimos para distinguir situaciones con potencialidad para dar precipitaciones muy importantes en el ámbito del GPV de Valencia de aquellas que no la tienen. Para ello, se han revisado situaciones con precipitaciones en la Comunidad Valenciana de más de 100 l/m2 desde el año 1968, con especial atención a ...

The humic matter as natural inhibitor of CaCO{sub 3} in cooling water system; Las sustancias humicas como inhibidores naturales del CaCO{sub 3}, en sistemas de enfriamiento

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Celada Murillo, Ana Teresa [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

2000-07-01

precipitacion se adicionan al agua de circulacion H{sub 2}SO{sub 4} e inhibidores de precipitacion que contienen polifosfatos (entre los mas utilizados). Estos quimicos traen consigo un impacto ambiental al estar asociados con problemas de eutroficacion de cuerpos de agua. Con el fin de contribuir a la disminucion del uso de aditivos contaminantes, esta investigacion propone la utilizacion de sustancias humicas (SH) como inhibidores naturales de la precipitacion del CaCO{sub 3}. Las SH son moleculas organicas de estructura quimica compleja, presentes en el agua y suelos por la degradacion de plantas y animales muertos, participan en reacciones de complejacion, intercambio ionico y adsorcion con iones metalicos. La inhibicion del CaCO{sub 3} por SH, se observo en soluciones sinteticas y de agua natural (pozo, rio y agua residual tratada), las cuales tenian concentraciones de calcio y alcalinidad tipicas del agua de repuesto y circulacion de sistemas de enfriamiento de centrales termoelectricas. En estas soluciones se indujo la precipitacion del CaCO{sub 3} por la adicion de NaOH 0.1 N en forma continua (metodo del pH critico), en ausencia y presencia de SH. En cada experimento, se registro el tiempo y volumen de hidroxido de sodio agregado para que la precipitacion de CaCO{sub 3} se presentara. La inhibicion de la precipitacion del CaCO{sub 3} por SH, fue evidente por el aumento en el tiempo de inicio de la precipitacion de esta sal. En las soluciones sinteticas este tiempo se incremento entre 30 y 40% y en las de agua natural (pozo) las SH inhibieron la precipitacion del CaCO{sub 3} durante 120 minutos.

COMPARACIÓN MEDIANTE UN ESTUDIO PROSPECTIVO Y ALEATORIZADO DE DOS MÉTODOS DE REPOSICIÓN EN UNIDADES DE ENFERMERÍA EN HOSPITALIZACIÓN POLIVALENTE DE AGUDOS CON ALMACENAMIENTO MEDIANTE DOBLE CAJETÍN

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José Luis Bernal

2017-01-01

Full Text Available Fundamentos: Los sistemas de almacenamiento mediante doble ca - jetín aumentan la satisfacción del personal de enfermería y disminuyen los inventarios, pero no se conocen las implicaciones de que sea el personal de logística quién determine la necesidad de reposición. El objetivo de este estudio fue evaluar si encomendar dicha responsabilidad a este personal en unidades de hospitalización polivalente de agudos entraña un mayor riesgo de pedidos extraordinarios. Métodos: Se realizó un estudio experimental, prospectivo aleatorizado con enmascaramiento. Los pedidos extraordinarios se consideraron variable de respuesta; los correspondientes a valoraciones del personal de logística se incluyeron en el grupo de intervención y los del personal de enfermería, en el de control. La concordancia entre observadores se analizó con el método de Bland- Altman; la diferencia entre grupos, con la U de Mann-Whitney y se calculó la incidencia acumulada de pedidos extraordinarios y su riesgo relativo. Resultados: La cantidad media solicitada por el personal de logística y el de enfermería fue 29,9 (DE:167,4 y 36 (DE:190 unidades respectiva - mente, la diferencia media entre observadores fue 6,11 (DE:128,95 uni - dades y no se encontraron diferencias significativas entre los grupos (p = 0,430. La incidencia de pedidos extraordinarios fue 0,64% en el grupo de intervención y 0,15% en el de control; el riesgo relativo, 2,31 (0,83 – 6,48 y el número de casos necesarios para un pedido extraordinario, 516. Conclusión: El riesgo de pedidos extraordinarios en unidades de hos - pitalización con almacenamiento mediante doble cajetín no está asociado con la categoría profesional del personal que identifica las necesidades de reposición.

LA MECÁNICA DEL DOBLE SALTO MORTAL ATRÁS EN LA SALIDA DE PARALELAS ASIMÉTRICAS

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E. Laterza

2010-07-01

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Este artículo muestra un estudio biomecánico cinematográfico de la salida de doble mortal atrás agrupado en paralelas asimétricas por cuatro gimnastas durante el campeonato mundial celebrado en Sttugart en 1989. Los resultados muestran el instante del despegue, para todos los gimnastas; los instantes posteriores (unos 62 milisegundos de media y el instante en el que el centro de masas (CM alcanza su máxima velocidad de componente vertical (max. Vy. En los últimos 62 ms previos al despegue, mientras el CM recorría los últimos 14º de rotación sobre la banda superior, se observó una reducción de un 5% en la velocidad vertical del CM. A pesar de ello, durante ese corto período de tiempo el gimnasta obtenía, gracias al impulso de reacción vertical de la banda, un gran incremento de 0.15men la máxima altura obtenida por elCMdurante la fase de vuelo. Esto incrementa el importante rol que desempeñan las acciones ejecutadas en los instantes inmediatamente previos al despegue. Si el despegue hubiese ocurrido 62 ms antes, en el instante en que se obtiene la máxima Vy, el momento angular de los gimnastas podría haber sido superior, permitiendo una velocidad de rotación más elevada. Sin embargo, el ángulo de barrido en la fase aérea podría haber sido mayor y el tiempo de vuelo levemente menor (-1%.

La presencia de Max Weber en el pensamiento español. Historia de una doble recepción

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Ruano de la Fuente, María Yolanda

2007-08-01

Full Text Available This paper examines two diverse and confronted receptions of Max Weber’s thought in the Hispanic world which we have described as “conservative” and “liberal” lines of interpretation. This analytical scheme allows us to group and highlight some of the most distinguished Spanish intellectuals whose work was influenced by Max Weber’s thought. We will review the context and the particular mode in which these intellectuals assimilated the German author’s work, the meaning of their interpretations and their labour of translation. In short, we will focus on the works of some renowned Hispanic philosophers, jurists and sociologists belonging to the “first interpretative generation” at work from the 1920’s to the 1940’s.Este artículo examina una doble y contrapuesta línea de recepción del pensamiento de Max Weber en el mundo hispanoparlante, que hemos denominado línea “conservadora” y línea “liberal”. Este esquema interpretativo permite agrupar y reseñar a algunos de los más destacados intelectuales españoles, cuyas obras estuvieron marcadas por la influencia del pensamiento de Max Weber. Revisamos el contexto, el sentido de la recepción, la labor de traducción y el modo peculiar en que asimilaron el trabajo del autor alemán. Nos centramos, en suma, en la obra de algunos renombrados filósofos, juristas y sociólogos de habla hispana, si bien limitamos nuestro análisis a la “primera generación receptora”, que fechamos en las décadas de los años 20 a los 40 del siglo XX.

Evaluación del comportamiento hidráulico en un reactor anaerobio de doble cámara (RADCA

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Nancy Rincón

2011-01-01

tales como cortos circuitos, zonas muertas y recirculación interna afectan su desempeño. En esta investigación se evaluó el comportamiento hidráulico de un reactor anaerobio de doble cámara (RADCA de 534,5 L (cámara 1=305 L y cámara 2= 229,5 L como innovación tecnológica de los reactores UASB. El RADCA fue alimentado con agua residual municipal (ARM de la ciudad de Maracaibo, Venezuela; cada una de las cámaras fueron inoculadas con lodo granular (20% v/v proveniente de una cervecería local. La evaluación hidráulica se realizó en la fase líquida y en operación utilizando Li+ (LiCl como trazador aplicado de forma instantánea en el afluente a tiempo de retención hidráulico teórico (TRHt de 6 horas; 3,4 h en la cámara 1 y 2,6 para la cámara 2. El RADCA describió un flujo pistón en ambas cámaras y una eficiencia hidráulica cercana a la unidad (1 indicando una presencia casi nula de zonas muertas. La eficiencia de remoción de la DQO total (DQOT del RADCA se mantuvo en el rango de 59,77% a 74,64% con un promedio de 68,26%. Para las cámaras 1 y 2 la eficiencia promedio fue 60,4 y 20,94% con una producción de biogás (L/h de 2,768 y 0,541 respectivamente.

Double-balloon enteroscopy: a descriptive study of 50 explorations Enteroscopia de doble balón: estudio descriptivo de 50 exploraciones

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E. Pérez-Cuadrado

2006-02-01

Full Text Available Aim: to evaluate the utility of double-balloon enteroscopy for small-bowel disease. Design: a prospective study of 50 consecutive enteroscopies performed from December 2004 to July 2005 to analyze diagnoses and treatments. Patients: 44 patients (33 had undergone a previous capsule endoscopy with indications for obscure digestive hemorrhage, angiodysplasia, Peutz-Jeghers syndrome, ulcer, suspected Crohn's disease, tumors, and refractory celiac disease. Results: we carried out enteroscopy studies in 44 patients by the oral route and, in 6 additional patients, by both the oral and anal routes. We reached the ileon with the oral route in all cases but one (jejunal stenosis, and in 4 cases out of 7 with the anal route, with an average duration of 73 minutes. We found angiodysplasia in 19 cases, as well as NSAID-related enteropathy, Crohn's disease, diverticulosis, and Waldenström's disease. We performed biopsies in 31% of cases with diagnoses of adenocarcinoma, lymphangiectasia secondary to tumor in celiac disease, and Whipple's disease. We treated 19 patients with angiodysplasia (1 to 20 synchronous lesions with argon, and 4 patients with polyps using polipectomy (sporadic polyps or Peutz-Jeghers syndrome. A retained capsule in one patient with stenosis was removed. Conclusions: double-balloon enteroscopy is a useful and effective technique in the diagnosis and treatment of small intestine diseases, thus complementing capsule endoscopy. More studies are needed to analyze its impact on the management of this condition.Objetivo: valorar la utilidad de la enteroscopia de doble balón en enfermedades de intestino delgado. Diseño: estudio prospectivo descriptivo de 50 enteroscopias consecutivas (diciembre 2004 a julio 2005, analizando diagnóstico y terapéutica. Pacientes: cuarenta y cuatro pacientes (33 con cápsula endoscópica previa con hemorragia digestiva oculta o lesiones detectadas mediante cápsula (angiodisplasias, pólipos, úlceras

Influencia de factores abióticos sobre la incidencia de Aedes aegypti en el municipio 10 de Octubre de Ciudad de La Habana, 1982-1992

OpenAIRE

MARQUETTI, MARIA DEL CARMEN; CARUS, FERNANDO; AGUILERA, LUCITA; NAVARRO, AGUSTIN

1995-01-01

Se realiza un análisis de la relación entre el número de focos de Aedes aegypti, las precipitaciones y las temperaturas ocurridas en las épocas de lluvia y seca durante los años 1982 a 1992, en el municipio 10 de Octubre, en Ciudad de La Habana. No se encontró correlación entre el número de focos y las precipitaciones ocurridas en ambas estaciones, así como tampoco entre el número de focos y las temperaturas, por lo que se enfatiza la necesidad de mantener una estricta vigilancia durante todo...

Validación de la precipitación estimada por satélite TRMM y su aplicación en la modelación hidrológica del rio Ramis Puno Perú

OpenAIRE

Lujano Laura, Efrain; Servicio Nacional de Meteorología e Hidrología; Felipe Obando, Oscar G.; Servicio Nacional de Meteorología e Hidrología; Lujano Laura, Apolinario; Quispe Aragón, José; Autoridad Nacional del Agua

2015-01-01

La investigación se realizó en la cuenca Ramis, ubicado al norte de la región hidrográfica del Titicaca (lado peruano), teniendo como objetivo validar las precipitaciones estimadas por satélite y su aplicación en la modelación hidrológica del rio Ramis. La validación de precipitaciones estimadas por satélite, se realizó mediante una comparación entre datos observados en ambos casos para el periodo enero de 1998 a diciembre 2013, los cuales fueron evaluados mediante los indicadores estadístico...

Comparative study of pneumocystography, positive contrast cystography and double contrast cystography in dogs; Estudio comparativo entre la neumocistografia, la cistografia de contraste positivo y la cistografia de doble contraste en perros

Energy Technology Data Exchange (ETDEWEB)

Thibaut, J.; Parada, E. [Universidad Austral de Chile, Valdivia (Chile); Vargas, L.; Deppe, R.; Born, R.

1997-07-01

un ayuno de 24 horas y dos enemas antes de tomar las radiografias. Los perros fueron anestesiados con tiopental sodico en dosis de 20 mg/kg e.v. La introduccion del medio de contraste se efectuo a traves de una sonda uretral. En la primera serie se realizo la neumocitografia introduciendo aire a la vejiga en dosis de 10 ml/kg. En la segunda serie se efectuo la cistografia de contraste positivo introduciendo Hypaque M-60% diluido, aportando 100 mg de y do por mi, en dosis de 10 ml/kg. Para la cistografia de doble contraste se introdujeron 10 ml de Hypaque M-60% diluido, en concentracion de 150 mg de yodo por ml. Luego por la misma sonda se introdujo aire en dosis de 10 ml/kg. Seguidamente, para cada tecnica fueron tomadas las radiografias en ambas proyecciones, al minuto y a los 10 minutos. Las placas radiograficas de cada serie se analizaron en base a los factores de densidad, contorno y tamano radiografico. La densidad radiografica en la neumocistografia, cistografia de contraste positivo y doble contraste fue predominantemente baja, alta e intermedia, respectivamente. El contorno radiografico se observo predominantemente liso en las tres tecnicas. Con respecto al tamano se aprecio una disminucion del alto y un aumento en el largo y el ancho, a los 10 minutos de iniciada cada tecnica respecto a lo registrado al minuto. Al comparar las tres tecnicas realizadas, se aprecio que la que detalla en mejor forma la mucosa vesical es la cistografia de doble contraste. La neumocistografia entregaria mejores resultados sobre cuerpos radioopacos y la cistografia demuestra mejor la posicion de la vejiga.

Procesos espaciales asociados a la construcción de la doble calzada BTS en los municipios de Tunja, Cómbita y Oicatá (2005-2012

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Andrés Felipe Bautista Vargas

2016-01-01

Full Text Available Se aborda el estudio de los procesos espaciales asociados a la construcción de la infraestructura vial de la doble calzada Briceño-Tunja-Sogamoso BTS, en los municipios de Tunja, Cómbita y Oicatá, en Colombia, a través de la fotointerpretación de imágenes Spot 2005 y Google Map Tiff 2012, aplicando la lectura de la leyenda nacional de coberturas de la tierra metodología Corine Land Cover (CLC adaptación para Colombia escala 1:100.000 (Ministerio de Ambiente y Desarrollo Sostenible, 2010. Se advirtieron diferentes procesos espaciotemporales no lineales, que obedecen a la incidencia de la infraestructura vial en la localización de nuevo tejido urbano discontinuo, fragmentación predial, y cambio de coberturas en su área de influencia. Como resultado se obtuvo un análisis espaciotemporal 2005-2012, conjugado con la estimación de la valorización predial, el cual resulta adecuado para apreciar la incidencia en el área de influencia, como evidenciar cambios transicionales en el uso del suelo.

El doble carácter de la educación indígena: reproducción y resistencia

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Alberto Padilla Arias

2002-01-01

Full Text Available Las reflexiones contenidas en este trabajo son el resultado de la interpretación de los datos producto de la investigación sobre el tema y se enmarcan dentro de la concepción epistemológica denominada: la cultura como categoría crítica, que ha sido desarrollada por diversos intelectuales latinoamericanos, en particular por Paulo Freire. El método de trabajo ha sido esencialmente de carácter documental. En este punto, a principios del siglo XXI, la investigación ha venido a evidenciar que tanto la educación formal como la no formal, —de los que nosotros llamaremos en adelante pueblos originarios o indígenas— en general, continúa sirviendo a la reproducción de los moldes culturales hegemónicos, tanto en su versión pública como privada. Sin embargo, por otra parte, la educación informal es la que ha permitido, a la mayoría de los pueblos indígenas y sus culturas, ejercer sus mecanismos de resistencia cultural, apoyando su supervivencia, no solamente en México, sino en cualquier punto del planeta dentro del nuevo esquema de regionalización-globalización. Es por ello que se puede afirmar que la educación indígena de hecho tiene un doble carácter como reza el título: reproducción y resistencia. Todo ello teniendo en cuenta múltiples factores que intervienen en los contextos nacionales con su naturaleza multicultural. En el trabajo se analizan las condiciones de diversos pueblos originarios o “indígenas” que han logrado sobrevivir con sus propias culturas, gracias a que han hecho uso de este proceso conservador autónomo, educación informal; así como la propuesta de Paulo Freire.

Métodos didácticos y sistemas de aprendizaje: teneduría de Libros y Partida Doble en Inglaterra (siglos XVI-XIX

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Juan Lanero Fernández

2006-12-01

Full Text Available El presente trabajo realiza una revisión bibliográfica de los tratados pedagógicos de teneduría de libros en el Reino Unido desde el siglo XVI, cuando se incorporó la partida doble, hasta finales del siglo XIX.Los rasgos didácticos más significativos de los primeros 250 años de docencia en teneduría de libros se resumen en la importancia que se concede al Libro Diario. Con el desarrollo de la partida doble se hizo habitual ampliar el significado de los términos débito y crédito más allá de la connotación personal original y aplicarlos a objetos inanimados y conceptos abstractos. La exposición mediante la personificación de cuentas consistía en un aprendizaje memorístico apoyado en normas y versificación.La disputa entre los que eran partidarios del Diario y aquellos que preferían el Mayor como libro de enseñanza, no era otra cosa más que la traducción del conflicto entre el enfoque memorístico y el racional de la teneduría de libros. Los seguidores del enfoque del Mayor salieron doblemente reforzados: significaba una enseñanza más racional y un cambio en las exigencias de los negocios.El Diario perdió su posición dominante cuando, a mediados del siglo XIX, surgió una teoría alternativa a la personificación de las cuentas. Se trata de la teoría de la propiedad de las cuentas y se ocupa del significado de éstas desde el punto de vista del propietario.The present paper makes a bibliographic checking of the pedagogic treatises of bookkeeping in the United Kingdom since 16th Century, when the double-entry system was introduced, up to the end of 19th Century.The most outstanding didactic feature of the first 250 years of bookkeeping teaching could be summed up in the prevalent role the Journal was given. With the development of the double-entry system, it became common extending the meaning of the terms debit and credit beyond the original personal connotation and applying them to inanimate objects and abstract

Estimación del volumen potencial de agua pluvial con fines agropecuarios

OpenAIRE

Oscar Brown Manrique; Yurisbel Gallardo Ballat; Fidel Diego Navas; José L. Companioni Sanderson; Wilfredo Pérez Duarte

2009-01-01

La investigación se desarrolla en la lechería de la Universidad de Ciego de Ávila a partir del estudio de una serie de 28 años de precipitaciones en la que se efectúa el análisis de consistencia y de frecuencia; así como el cálculo de los estadígrafos fundamentales, la probabilidad empírica, el volumen de captación de agua pluvial, el área de captación y el volumen de almacenamiento. Los resultados demuestran que los datos de precipitaciones se pueden utilizar con seguridad en la evaluación d...

Evaluación de vacas de doble propósito de genotipos Holstein x Cebú en sistemas de pastoreo arborizado: II. Bíparas Evaluation of double purpose Holstein x Zebu cows in grazing systems with trees: II. Biparous

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L Simón

2010-06-01

Full Text Available Con el objetivo de evaluar el comportamiento productivo y reproductivo de vacas bíparas de doble propósito de los cruzamientos Holstein x Cebú, se utilizaron 75 vacas en un diseño totalmente aleatorizado, 25 por grupo de los genotipos Siboney (5/8 Holstein x 3/8 Cebú, Mambí (3/4 H x ¼ C y Siboney mestizo (5/8 H x 3/8 C, las cuales integraron un rebaño común con acceso al mismo manejo y alimentación, en una vaquería de producción de la granja Supervaca de la Empresa Pecuaria Genética de Matanzas. La carga fue de 1,6 UGM/ha y rotaron en 28 cuartones. Mensualmente se midió la disponibilidad de pastos y la oferta diaria de los forrajes y los suplementos. Se apreció la condición corporal al inicio y al final de cada estación, la producción de leche por vaca se midió quincenalmente, y se determinó la duración y producción por lactancia y los indicadores de reproducción. La mejor condición corporal (3,97 favoreció al Siboney mestizo (PIn order to evaluate the productive and reproductive performance of biparous double-purpose Holstein x Zebu cows, 75 cows were used in a completely randomized design, 25 per group, from genotypes Siboney (5/8 Holstein x 3/8 Zebu, Mambí (3/4 H x ¼ Z and crossbred Siboney (5/8 H x 3/8 Z, which integrated a common herd with access to the same management and feeding, in a production dairy unit of the Supervaca farm, Genetic Livestock Production Firm of Matanzas. The stocking rate was 1,6 animals/ha and they rotated in 28 paddocks. Pasture availability and daily offer of forages and supplements were monthly measured. The body condition was estimated at the beginning and end of each season, milk production per cow was fortnightly measured, and the duration and production per lactation and the reproduction indicators were determined. The best body condition (3,97 favored crossbred Siboney (P<0,01; while no significant differences were found in the duration and production of milk per lactation. Likewise

Enteroscopia de doble balón para el diagnóstico de las enfermedades del intestino delgado en los niños Double-balloon enteroscope for the diagnosis of small intestine diseases in children

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Héctor Rubén Hernández Garcés

2010-12-01

Full Text Available INTRODUCCIÓN. La enteroscopia de doble balón (EDB es un nuevo método que permite la visualización completa de la luz del intestino delgado. La presente investigación se realizó con el objetivo de evaluar la experiencia en la realización de esta técnica en niños atendidos en el Servicio de Endoscopia Pediátrica del Instituto Cubano de Gastroenterología. MÉTODOS. Se realizó un estudio descriptivo retrospectivo para evaluar la seguridad, eficacia y extensión de exploración de la enteroscopia de doble balón en el diagnóstico de las enfermedades del intestino delgado en niños. Para ello fueron estudiados 8 pacientes con examen físico y complementarios negativos de enfermedad del intestino delgado, atendidos entre noviembre de 2008 y octubre de 2009. En 3 de los 8 pacientes existía la sospecha clínica y radiológica de enfermedad de Crohn; en otros 3, la sospecha de tumor de intestino delgado y los restantes fueron atendidos por presentar sangramiento oculto de origen intestinal. RESULTADOS. Se practicaron 7 procedimientos por vía retrógrada y 2 por vía anterógrada; a un paciente se le realizó enteroscopia total empleando ambas vías. La duración media de la EDB por vía oral fue de 62,5 min, con un intervalo de 60 a 65 min y por la vía anal fue de 50,7 min, con intervalo de 45 a 60 min. En todos los casos se logró identificar alguna lesión que explicara los síntomas. CONCLUSIÓN. La enteroscopia de doble balón es un método seguro para el diagnóstico de enfermedades del intestino delgado en los niños.INTRODUCTION. The double balloon enteroscope (DBE is a new method allows the whole visualization of the small intestine lumen. The objective of present research was to assess the experience in the carrying out of this technique in children seen in the Pediatric Endoscopy Service of the Cuban Institute of Gastroenterology. METHODS. A retrospective and descriptive study was conducted to assess the accuracy, effectiveness

Distintas o iguales: las diferencias en el trabajo doméstico de las parejas de doble ingreso entre las uniones libres y los matrimonios

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Landy Sánchez Peña

2016-01-01

Full Text Available La brecha de género en el trabajo doméstico ha sido ampliamente estudiada en México, mostrando gradientes por nivel socioeconómico y diferencias asociadas a la participación de las mujeres en el trabajo extradoméstico. En este artículo indagamos en qué medida ambos procesos dan forma al reparto del trabajo doméstico entre parejas de doble provee - dor que difieren por tipo de unión. Basamos el análisis empírico en la ENIGH 2010 utilizando modelos de regresión. Nuestros resultados sugieren que la brecha de género en el trabajo doméstico es menor en las parejas en unión libre en comparación con las pa - rejas casadas, aun tomando en cuenta efectos de selección. Entre las primeras, la brecha se reduce mayormente conforme aumenta el ingreso, de modo que las parejas en unión libre y de alto ingreso representan el arreglo más equitativo en la división sexual del trabajo no remunerado. Ello se debe a que las mujeres en unión libre dedican menos tiempo al trabajo doméstico que las casadas, mientras que entre los varones no observamos diferencias.

Ordenamiento Urbano y Territorial visto desde el manejo de cuencas a través de un Sistema de Información Geográfica (SIG en la Cuenca El Ahogado, Jalisco

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Juan Luis Caro Becerra

2014-01-01

Full Text Available Se identifican en la Cuenca El Ahogado los puntos vulnerables en áreas susceptibles a inundaciones por lluvias, ya que todos los escurrimientos fluyen hacia la parte baja, ocasionadas por factores pluviales como la intensidad en periodos cortos o precipitaciones máximas en 24 horas. Después se integró una base de datos de lluvias máximas en 24 horas de por lo menos 20 años, ya que puntualiza el régimen pluvial de la región, con el objetivo de predecir el riesgo por precipitaciones intensas sobre lo cual se basa este trabajo. Se complementa con un análisis prospectivo.

Dual renin-angiotensin system blockade plus oral methylprednisone for the treatment of proteinuria in IgA nephropathy Doble bloqueo del sistema renina-angiotensina más metilprednisona oral para el tratamiento de la proteinuria en la nefropatía por IgA

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Hernán Trimarchi

2007-10-01

Full Text Available Renin-angiotensin system inhibition is a widely accepted approach to initially deal with proteinuria in IgA nephropathy, while the role of immunosuppressants remains controversial in many instances. A prospective, uncontrolled, open-label trial was undertaken in patients with biopsy-proven IgA nephropathy with proteinuria > 0.5 g/day and normal renal function to assess the efficacy of a combination treatment of angiotensin converting enzyme inhibitors plus angiotensin receptor blockers enalapril valsartan coupled with methylprednisone to decrease proteinuria to levels below 0.5 g/day. Twenty patients were included: Age 37.45 ± 13.26 years (50% male; 7 patients (35% were hypertensive; proteinuria 2.2 ± 1.86 g/day; serum creatinine 1.07 ± 0.29 mg/dl; mean follow-up 60.10 ± 31.47 months. IgA nephropathy was subclassified according to Haas criteria. Twelve patients (60% were class II; seven (35% were class III and one (5% class V. All patients received dual reninangiotensin system blockade as tolerated. Oral methylprednisone was started at 0.5 mg/kg/day for the initial 8 weeks and subsequently tapered bi-weekly until the maintenance dose of 4 mg was reached. Oral steroids were discontinued after 24 weeks (6 months of therapy but renin-angiotensin inhibition remained unchanged. At 10 weeks of therapy proteinuria decreased to 0.15 ± 0.07 g/day (P El doble bloqueo del sistema renina-angiotensina con inhibidores de la enzima convertidora de angiotensina junto a bloqueadores del receptor tipo I de angiotensina II es aceptado como tratamiento en la proteinuria de la nefropatía por IgA, ya que el rol de los inmunosupresores continúa siendo controvertido. Estudio prospectivo, no controlado, abierto para pacientes con nefropatía por IgA con proteinurias >0.5 g/día y creatininas séricas <1.4 mg/dl, para evaluar la eficacia de tratamiento de enalapril más valsartán asociado a metilprednisona vía oral para disminuir las proteinurias a <0.5 g

Synthesis and characterisation of Cu(II), Ni(II), Mn(II), Zn(II) and VO(II ...

Indian Academy of Sciences (India)

Unknown

Synthesis and characterisation of Cu(II), Ni(II), Mn(II), Zn(II) and VO(II) Schiff base complexes derived from o-phenylenediamine and acetoacetanilide. N RAMAN*, Y PITCHAIKANI RAJA and A KULANDAISAMY. Department of Chemistry, VHNSN College, Virudhunagar 626 001, India e-mail: ra_man@123india.com.

Biologically active new Fe(II, Co(II, Ni(II, Cu(II, Zn(II and Cd(II complexes of N-(2-thienylmethylenemethanamine

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C. SPÎNU

2008-04-01

Full Text Available Iron(II, cobalt(II, nickel (II, copper (II, zinc(II and cadmium(II complexes of the type ML2Cl2, where M is a metal and L is the Schiff base N-(2-thienylmethylenemethanamine (TNAM formed by the condensation of 2-thiophenecarboxaldehyde and methylamine, were prepared and characterized by elemental analysis as well as magnetic and spectroscopic measurements. The elemental analyses suggest the stoichiometry to be 1:2 (metal:ligand. Magnetic susceptibility data coupled with electronic, ESR and Mössbauer spectra suggest a distorted octahedral structure for the Fe(II, Co(II and Ni(II complexes, a square-planar geometry for the Cu(II compound and a tetrahedral geometry for the Zn(II and Cd(II complexes. The infrared and NMR spectra of the complexes agree with co-ordination to the central metal atom through nitrogen and sulphur atoms. Conductance measurements suggest the non-electrolytic nature of the complexes, except for the Cu(II, Zn(II and Cd(II complexes, which are 1:2 electrolytes. The Schiff base and its metal chelates were screened for their biological activity against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa and the metal chelates were found to possess better antibacterial activity than that of the uncomplexed Schiff base.

Complexes of cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II) and dioxouranium(II) with thiophene-2-aldehydethiosemicarbazone

International Nuclear Information System (INIS)

Singh, Balwan; Misra, Harihar

1986-01-01

Metal complexes of thiosemicarbazides have been known for their pharmacological applications. Significant antitubercular, fungicidal and antiviral activities have been reported for thiosemicarbazides and their derivatives. The present study describes the systhesis and characterisation of complexes of Co II , Cu II , Zn II ,Cd II and UO II with thiosemicarbazone obtained by condensing thiophene-2-aldehyde with thiosemicarbazide. 17 refs., 2 tables. (author)

Mn(II), Zn(II) and VO(II) Schiff

Indian Academy of Sciences (India)

Home; Journals; Journal of Chemical Sciences; Volume 113; Issue 3. Synthesis and characterisation of Cu(II), Ni(II), Mn(II), Zn(II) and VO(II) Schiff base complexes derived from o-phenylenediamine and acetoacetanilide. N Raman Y Pitchaikani Raja A Kulandaisamy. Inorganic Volume 113 Issue 3 June 2001 pp 183-189 ...

Propuesta para la adopción de tecnología en el sistema bovino de doble propósito

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H. Suárez

2012-01-01

Full Text Available El presente trabajo tiene por objetivo proponer aspectos fundamentales para la adopción tecnológica en el sistema bovino de doble propósito. Esta propuesta plantea que el proceso de innovación tecnológica se inicia con la descripción del objetivo de la unidad de producción y su situación actual, con énfasis en el área que se pretenda aplicar. Enseguida, se debe identificar, correctamente, la necesidad que se pretende resolver y la alternativa tecnológica más pertinente. Cualquiera que sea el factor que detone la necesidad de tecnificación, la inversión realizada debe ser rentable. Después, se identifican los aspectos de flexibilidad de la alternativa tecnológica, para descubrir las posibilidades de retirarla y sustituirla por otra; o bien, modificarla según las nuevas necesidades de la unidad de producción. Luego, se debe verificar que el productor tenga interés genuino en adoptar la tecnología y que dispone de los recursos financieros necesarios. En este caso, se advierte que no porque la opción tecnológica haya funcionado bien en otra unidad de producción, también lo hará en ésta y viceversa. Además, se requiere que el productor realice la completa adopción de la alternativa tecnológica, que se capacite el personal que la pondrá en marcha y que se lleven a cabo las adecuaciones pertinentes en todo el sistema de producción. Una vez adoptada la alternativa, se deben evaluar los impactos generados. Se concluye que la innovación corresponde a un proceso de aprendizaje modulado en el tiempo, y que la pertinencia de los recursos tecnológicos debe ser objeto de análisis y actualización continua.

Desarrollo de una bomba reciprocante de doble efecto para desalinización de agua por medio de osmosis inversa

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Carlos Julián Ospina

2008-05-01

Full Text Available El presente artículo describe el trabajo realizado en el desarrollo de un sistema de bombeo para desalinización con membranas de osmosis inversa. El sistema debe cumplir con requerimientos de alta presión (4.8 MPa y bajos caudales (3.78 L/min, para operar la membrana de osmosis inversa en su rango de mínimo consumo energético. Para cumplir este objetivo se desarrolla un sistema de desplazamiento positivo de acción simple y doble efecto, impulsado con un motoreductor cicloidal. La bomba desarrollada es evaluada experimentalmente bajo condiciones de laboratorio. El análisis de los resultados evidencia altas eficiencias de conversión de energía a lo largo del ciclo de bombeo. Posteriormente, el sistema de bombeo es evaluado en conjunto con una membrana de osmosis inversa, obteniéndose resultados satisfactorios en cuanto a tasas de flujo y concentraciones de permeado. El diseño cumple con los requisitos para sustituir sistemas de bombeo usados en la actualidad, tecnológicamente más complejos y al mismo tiempo más costosos./ The present paper describes the work carried out in the development of a pump system for water desalination in a small reverse osmosis plant. The system must satisfy high pressure (4.8 MPa and low flow rates (3.78 L/min to operate the reverse osmosis membrane in its minimum energy consumption range. In order to achieve this objective, a positive displacement pump system (single action double effect driven by a cyclo speed reduction was developed. The system was tested under laboratory conditions. The analysis of the results shows high energy conversion efficiencies throughout the pumping cycle. The equipment was validated based on the acceptable flow and permeates concentration results. This design is able of replacing actual pump systems that are technologically complex and at the same time more expensive.

Hooks, fibulae, earrings and knives: a sample of the output of the metallurgy workshops of La Fonteta | Anzuelos, fíbulas, pendientes y cuchillos: una muestra de la producción de los talleres metalúrgicos de La Fonteta

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Alfredo González Prats

2010-12-01

Full Text Available In this paper we present some of the objects found amongst metallurgical refuse belonging to the earliest phases (Fonteta I and Fonteta II, c. 760-670 bc of Phoenician settlement: hooks, double-spring fibulae, earrings in the form of a crescent moon and iron knifes, assumed to be have been produced locally. | Entre los diversos objetos de metal recuperados en las escombreras metalúrgicas de Fonteta I y Fonteta II (c. 760-670 bc, destacamos los anzuelos, las fíbulas de doble resorte, los pendientes semilunares y los cuchillos de hierro, ante la certeza o presunción de su elaboración local.

Adoption of Double Entry Bookkeeping in Mexico and Spain Adopción de la partida doble en México y España

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Bernardo Bátiz-Lazo

2012-12-01

Full Text Available There are conflicting and even contradictory claims as to when exactly double entry bookkeeping arrived to New Spain as well as its diffusion during the colonial era. Although we fail to present evidence from Mexican private enterprise, we address the apparent contradictions while putting forward the idea that the history of "modern" accounting practice in Latin America should be framed by developments in its former colonial power. Our conclusion is that the history of Latin American accounting should be wary of extrapolating everyday practice by interpreting bibliographic material and proceed to pay greater attention to the appropriation of accounting technology through the examination of surviving company documents as well as informal educational practices amongst organizations based in Spain and its colonies.Las fuentes y la información disponible son contradictorias respecto al origen y difusión de la partida doble durante la colonización española y tras la independencia. Aunque no ofrecemos evidencia sobre actividades en el ámbito de la empresa privada, este artículo se propone acotar dicho debate y obtener nuevas conclusiones al proponer que la historia de la contabilidad "moderna" en América Latina debería estar enmarcada por los acontecimientos en la metrópoli. Nuestra conclusión es que la historia de la contabilidad en América Latina debe proceder con el examen de fuentes y prácticas de las organizaciones y no llegar a conclusiones únicamente basadas en el examen de libros de texto.

Adsorption of Pb(II), Cu(II), Cd(II), Zn(II), Ni(II), Fe(II), and As(V) on bacterially produced metal sulfides.

Science.gov (United States)

Jong, Tony; Parry, David L

2004-07-01

The adsorption of Pb(II), Cu(II), Cd(II), Zn(II), Ni(II), Fe(II) and As(V) onto bacterially produced metal sulfide (BPMS) material was investigated using a batch equilibrium method. It was found that the sulfide material had adsorptive properties comparable with those of other adsorbents with respect to the specific uptake of a range of metals and, the levels to which dissolved metal concentrations in solution can be reduced. The percentage of adsorption increased with increasing pH and adsorbent dose, but decreased with increasing initial dissolved metal concentration. The pH of the solution was the most important parameter controlling adsorption of Cd(II), Cu(II), Fe(II), Ni(II), Pb(II), Zn(II), and As(V) by BPMS. The adsorption data were successfully modeled using the Langmuir adsorption isotherm. Desorption experiments showed that the reversibility of adsorption was low, suggesting high-affinity adsorption governed by chemisorption. The mechanism of adsorption for the divalent metals was thought to be the formation of strong, inner-sphere complexes involving surface hydroxyl groups. However, the mechanism for the adsorption of As(V) by BPMS appears to be distinct from that of surface hydroxyl exchange. These results have important implications to the management of metal sulfide sludge produced by bacterial sulfate reduction.

Neuroimaging in cockroach phobia: An experimental study

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Francisco Rivero

2017-01-01

Full Text Available Antecedentes/Objetivo: En este estudio se exploran las características en neuroimagen de personas con fobia específica a peque ̃ nos animales (cucarachas, para determinar si existen diferencias en la actividad cerebral entre personas con y sin fobia a las cucarachas, bajo condi- ciones de estimulación fóbica y no fóbica. Método : Se estudiaron 24 adultos (12 con fobia. El diagnóstico de fobia específica se obtuvo mediante una entrevista estructurada y cuestionarios. Todos fueron expuestos a una presentación en video 3D durante una sesión de RMNf. Resultados: El grupo con fobia mostró activaciones diferenciales significativas, que fueron congruentes con el modelo de doble ruta en el procesamiento del miedo, a través del tálamo- amígdala (ruta I, y tálamo-corteza entorrinal-hipocampo-subículo-amígdala (ruta II. Además, se encontraron activaciones diferenciales en el globo pálido, en el giro hipocampal, ínsula, y en los pars orbitalis, triangularis y opercularis. Con respecto al grupo control, no se observaron activaciones de la ínsula ni el cingulado. Conclusiones: Parece evidenciarse un modelo de doble ruta en el procesamiento de estímulos fóbicos. Este doble proceso puede tener implicaciones para el tratamiento psicológico de las fobias específicas.

Synthesis and spectroscopic studies of biologically active tetraazamacrocyclic complexes of Mn(II, Co(II, Ni(II, Pd(II and Pt(II

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Monika Tyagi

2014-01-01

Full Text Available Complexes of Mn(II, Co(II, Ni(II, Pd(II and Pt(II were synthesized with the macrocyclic ligand, i.e., 2,3,9,10-tetraketo-1,4,8,11-tetraazacycoletradecane. The ligand was prepared by the [2 + 2] condensation of diethyloxalate and 1,3-diamino propane and characterized by elemental analysis, mass, IR and 1H NMR spectral studies. All the complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, IR, electronic and electron paramagnetic resonance spectral studies. The molar conductance measurements of Mn(II, Co(II and Ni(II complexes in DMF correspond to non electrolyte nature, whereas Pd(II and Pt(II complexes are 1:2 electrolyte. On the basis of spectral studies an octahedral geometry has been assigned for Mn(II, Co(II and Ni(II complexes, whereas square planar geometry assigned for Pd(II and Pt(II. In vitro the ligand and its metal complexes were evaluated against plant pathogenic fungi (Fusarium odum, Aspergillus niger and Rhizoctonia bataticola and some compounds found to be more active as commercially available fungicide like Chlorothalonil.

Corrección de cicatrices postraqueostomía mediante doble colgajo adipofascial opuesto Double opposite adipofascial flap for the correction of post-tracheostomy scars

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S. Llanos

2012-12-01

Full Text Available La traqueostomía es un procedimiento frecuentemente para asegurar una vía aérea permeable en casos de intubación prolongada, trauma facial severo y neoplasias de cabeza y cuello. Tras la extubación, el defecto se deja cerrar por segunda intención con el resultado de una cicatriz defectuosa, de pobre resultado estético y con frecuentes alteraciones funcionales asociadas, como por ejemplo disfagia. Se han descrito muchas técnicas para la corrección de estas cicatrices, sin embargo, algunas no corrigen los defectos funcionales y otras requieren una gran disección y movilización de los tejidos. Proponemos una técnica basada en dos colgajos adipofasciales de base opuesta y dependientes de circulación random realizada en 7 pacientes con cicatriz defectuosa postraqueostomía con buenos resultados estéticos y funcionales.Tracheostomy is a frequently used procedure to secure a viable airway in cases such as prolonged intubation, facial trauma and head and neck cancer. After decannulation, the defect is left to heal by secondary intention resulting in a poor aesthetic and functional outcome. Many techniques have been described to correct this defects, however they don´t correct functional defect and some of them require large and complex dissections and manipulation of subdermal tissues. In order to correct these defects we present a technique using a doble opposite adipofascial flap based on random irrigation. This technique has been used in 7 patients with good aesthetical and functional results.

Comportamiento a la Corrosión del Acero API X70 Soldado por el Proceso de Doble Arco Sumergido Inmerso en Diferentes Medios Corrosivos

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Omar Francisco Montes

Full Text Available Resumen Los aceros API X70 son aplicados en fabricación y construcción de tuberías para el transporte de hidrocarburos, sin embargo, a un lapso de tiempo se degradan debido al medio ambiente al cual están expuestos; influyendo en la velocidad y tipo de corrosión sobre las superficies del metal base (MB, zona afectada por el calor (ZAC y zona de fusión (ZF. A fin de conocer y evaluar la susceptibilidad a la corrosión en uniones del acero API X70 sometido a diferentes medios corrosivos, varias pruebas se llevaron a cabo por el proceso de soldadura de doble arco sumergido (DSAW, por sus siglas en inglés, las cuales fueron inmersas en diferentes electrolitos: Cloruro de Sodio (NaCl al 3,5% y Agua (H2O a temperatura ambiente para conocer su comportamiento. Se utilizaron técnicas electroquímicas de ruido electroquímico (RE y curvas de polarización cíclica (CPC para obtener velocidad y tipo de corrosión producida en cada una de las muestras analizadas, incluyendo las tres zonas: MB, ZAC y ZF. Además, se utilizaron técnicas de caracterización como microscopía óptica (MO y microscopía electrónica de barrido (MEB para el análisis superficial. La mayoría de las soldaduras presentan corrosión mixta, con mayores velocidades de corrosión en 3,5% de NaCl.

Effect of Cu(II), Cd(II) and Zn(II) on Pb(II) biosorption by algae Gelidium-derived materials.

Science.gov (United States)

Vilar, Vítor J P; Botelho, Cidália M S; Boaventura, Rui A R

2008-06-15

Biosorption of Pb(II), Cu(II), Cd(II) and Zn(II) from binary metal solutions onto the algae Gelidium sesquipedale, an algal industrial waste and a waste-based composite material was investigated at pH 5.3, in a batch system. Binary Pb(II)/Cu(II), Pb(II)/Cd(II) and Pb(II)/Zn(II) solutions have been tested. For the same equilibrium concentrations of both metal ions (1 mmol l(-1)), approximately 66, 85 and 86% of the total uptake capacity of the biosorbents is taken by lead ions in the systems Pb(II)/Cu(II), Pb(II)/Cd(II) and Pb(II)/Zn(II), respectively. Two-metal results were fitted to a discrete and a continuous model, showing the inhibition of the primary metal biosorption by the co-cation. The model parameters suggest that Cd(II) and Zn(II) have the same decreasing effect on the Pb(II) uptake capacity. The uptake of Pb(II) was highly sensitive to the presence of Cu(II). From the discrete model it was possible to obtain the Langmuir affinity constant for Pb(II) biosorption. The presence of the co-cations decreases the apparent affinity of Pb(II). The experimental results were successfully fitted by the continuous model, at different pH values, for each biosorbent. The following sequence for the equilibrium affinity constants was found: Pb>Cu>Cd approximately Zn.

PERAN MOTIVASI KERJA DAN DUKUNGAN SUAMI TERHADAP STRES KONFLIK PERAN GANDA DAN KEPUASAN PERKAWINAN

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Eva Meizara Puspita Dewi

2018-02-01

Full Text Available The purpose of this research was to analize (1 the impact of work motivation to conflict stress caused by doble roles on career women, (2 the effect of spouse support to conflict stress caused by doble roles on career women, (3 the influence of spouse support to marriage contentment on career women, and (4 The influence of conflict stress of doble roles on career women and their marriage contement. This research employed quantitatif approch. There were 30 employees of BNI Makassar branch taken as subjects based on purposive sampling method. The 4 scale research instrument was applied while regression program of SPSS windows 14.00 was employed to analize the data. Study found that (1 there were negative impact of work motivation to conflict stress of doble roles on career women (r=0,436, (2 there were negatif effect of spouse support to conflict stress caused by doble roles on career women (r=0,745, (3 there were positif influence of spouse support to marriage contentment on career women (r=0,645, and (4 there were negative influence of conflict stress of doble roles on career women and their marriage contement (r=0,429.

La espada de La Perla. Estudio de las empuñaduras de remaches con doble arco: un Unicum en la serie de armas europeas de la Edad del Bronce

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Gómez Ramos, Pablo

2001-12-01

Full Text Available The study of the Bronze-Age sword from La Perla (Madrid, Spain shows the development of a unique hilt design in the shape of a double-arch during the Early and Middle Bronze Ages. After the well-known paper by Almagro-Gorbea in 1972 on the Guadalajara sword, new archaeological finds during the last thirty years have shown the singularity of this system as against those employed in other parts of Europe, a singularity confirmed by numerous metallurgical analyses of Bronze Age swords.

El estudio de la espada madrileña de La Perla viene a constatar un modelo único de enmangar espadas en España durante el Bronce Antiguo y Medio, mediante empuñaduras de doble arco. Desde el trabajo clásico de Almagro Gorbea en 1972 sobre la espada de Guadalajara, se han venido sucediendo en estas casi tres décadas, nuevos hallazgos arqueológicos que refuerzan la singularidad del ejemplo español con respecto a otras áreas europeas y que se completa con la investigación de los análisis metalúrgicos realizados a numerosas espadas de la Edad del Bronce.

Physicochemical properties of 3,4,5-trimethoxybenzoates of Mn(II, Co(II, Ni(II and Zn(II

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W. FERENC

2005-09-01

Full Text Available The complexes of Mn(II, Co(II, Ni(II, Cu(II and Zn(II with 3,4,5-trimethoxybenzoic acid anion of the formula: M(C10H11O52·nH2O, where n = 6 for Ni(II, n = 1 for Mn(II, Co(II, Cu(II, and n = 0 for Zn, have been synthesized and characterized by elemental analysis, IR spectroscopy, X–ray diffraction measurements, thermogravimetry and magnetic studies. They are crystalline compounds characterized by various symmetry. They decompose in various ways when heated in air to 1273 K. At first, they dehydrate in one step and form anhydrous salts. The final products of decomposition are oxides of the respective metals (Mn2O3, Co3O4, NiO, CuO, ZnO. The solubilities of the analysed complexes in water at 293 K are in the orders of 10-2 – 10-4 mol dm-3. The magnetic susceptibilities of the Mn(II, Co(II, Ni(II and Cu(II complexes were measured over the range of 76–303 K and the magnetic moments were calculated. The results show that the 3,4,5-trimethoxybenzoates of Mn(II, Co(II and Ni(II are high-spin complexes but that of Cu(II forms a dimer [Cu2(C10H11O54(H2O2]. The carboxylate groups bind as monodentate or bidentate chelating or bridging ligands.

Synthesis and spectral studies of manganese(II), cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II) and mercury(II) complexes of 4-oxo-4H-1-benzopyran-3-carboxaldehyde hydrazone derivatives

International Nuclear Information System (INIS)

Nawar, N.; Khattab, M.A.; Bekheit, M.M.; El-Kaddah, A.H.

1996-01-01

A few complexes of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) with 4-oxo-4H-1-benzopyran-3-(carboxaldehyde-4-chlorobenzylhydrazone) (BCBH) and 4-oxo-4H-1-benzopyran-3-(carboxaldehyde-4-methylbenzylhydrazone) (BMBH) have been synthesised and characterized by elemental analysis, molar conductivities, magnetic measurements and infrared (IR) and visible spectral studies. The IR spectra show that BCBH and BMBH behave as bidentate ligands either in the keto or enol form. (author). 24 refs., 2 tabs

Reactogenicidad de la vacuna cubana trivalente contra la leptospirosis humana en un ensayo clínico de fase II

OpenAIRE

Raydel Martínez,; Alberto Pérez; Alberto Baly; Morelia Baró; Reynaldo Menéndez; Aroldo Ruíz; Amelia Urbino López; Manuel Díaz; Marlene Armesto

2001-01-01

Con el objetivo de evaluar la reactogenicidad de la vacuna cubana trivalente contra la leptospirosis humana (vax- SPIRAL) en grupos de voluntarios sanos utilizando diferentes dosis, se realizó un ensayo clínico controlado, aleatorio y a doble ciego. Los voluntarios fueron distribuidos en dos grupos (vacunados y placebos) para evaluar las reacciones adversas en diferentes concentraciones de dosis (0,25 y 0,5 mL). Los síntomas y signos locales evaluados fueron: dolor, rubor, infiltración local,...

Synthesis, Characterization, and Biological Activity of Mn(II, Fe(II, Co(II, Ni(II, Cu(II, Zn(II, and Cd(II Complexes of N-Thiophenoyl-N′-Phenylthiocarbohydrazide

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M. Yadav

2013-01-01

Full Text Available Mn(II, Fe(II, Co(II, Ni(II, Cu(II, Zn(II, and Cd(II complex of N-thiophenoyl -N′-phenylthiocarbohydrazide (H2 TPTH have been synthesized and characterized by elemental analysis, magnetic susceptibility measurements, infrared, NMR, electronic, and ESR spectral studies. The complexes were found to have compositions [Mn(H TPTH2], [Co(TPTH (H2O2], [Ni(TPTH (H2O2], [Cu(TPTH], [Zn(H TPTH], [Cd(H TPTH2], and [Fe(H TPTH2(EtOH]. The magnetic and electronic spectral studies suggest square planar geometry for [Cu(TPTH], tetrahedral geometry for [Zn(TPTH] and [Cd(H TPTH2], and octahedral geometry for rest of the complexes. The infrared spectral studies of the 1 : 1 deprotonated complexes suggest bonding through enolic oxygen, thiolato sulfur, and both the hydrazinic nitrogens. Thus, H2TPTH acts as a binegative tetradentate ligand. H2 TPTH and its metal complexes have been screened against several bacteria and fungi.

Agua, pobreza y uso del tiempo en México: Análisis cuantitativo como sustento del diseño de una política pública de doble dividendo

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Alejandro Guevara Sanginés

2015-01-01

Full Text Available Introducción: Los impactos de la escasez y contaminación del agua afectan a grandes sectores de la población, pero inciden de manera desproporcionada en los sectores de menores ingresos. El acceso al agua ha sido reconocido como un derecho fundamental para una vida digna por las Naciones Unidas (UN, 2010, por lo que si el Estado no pone los medios para el acceso universal al agua, estaría impidiendo la realización de los derechos humanos de una parte de la población. Así, la relación agua - pobreza es de la mayor importancia tanto desde el punto de vista de salud pública como el de equidad social. El presente trabajo estudia la relación entre la falta de acceso al agua, el tiempo destinado a trabajar y los niveles de ingreso. Método: Con información de dos rondas de la Encuesta Nacional sobre Uso del Tiempo 2002 y 2009 del INEGI, se estima la brecha de ingreso y de las horas trabajadas entre la población que destina tiempo en acarrear agua con aquella (estadísticamente comparable que no realiza esta actividad. Esto se hace a partir de un método de apareamiento (propensity score matching considerando características personales y del municipio donde éstas viven. Resultados: En ambos casos se observa una diferencia estadísticamente significativa. En el primero, la brecha del ingreso familiar trimestral era de alrededor de 9% en 2002 y de 12% en 2009. En el segundo, se estima que una persona que acarrea agua disminuye el tiempo que destinaba a trabajar en alrededor de 13% tanto en 2002 como en 2009. Estos resultados sugieren que la falta de acceso al agua es una condición que tiene un impacto significativo en hacer más proclive a una persona a caer en una condición de pobreza. Discusión o Conclusión: Una política de cobertura de dicho servicio tiene el doble efecto de atender un satisfactor fundamental de bienestar a la vez que libera a las personas de un tiempo adicional que puede aprovecharse en horas productivas. Ambos

Chemical speciation of Pb(II, Cd(II, Hg(II, Co(II, Ni(II, Cu(II and Zn(II binary complexes of l-methionine in 1,2-propanediol-water mixtures

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M. Padma Latha

2007-04-01

Full Text Available Chemical speciation of Pb(II, Cd(II, Hg(II, Co(II, Ni(II, Cu(II and Zn(II complexes of L-methionine in 0.0-60 % v/v 1,2-propanediol-water mixtures maintaining an ionic strength of 0.16 M at 303 K has been studied pH metrically. The active forms of ligand are LH2+, LH and L-. The predominant species detected are ML, MLH, ML2, ML2H, ML2H2 and MLOH. Models containing different numbers of species were refined by using the computer program MINIQUAD 75. The best-fit chemical models were arrived at based on statistical parameters. The trend in variation of complex stability constants with change in the dielectric constant of the medium is explained on the basis of electrostatic and non-electrostatic forces.

Doble difusión a partir de mediciones de microestructura en los canales Martínez y Baker, Patagonia chilena central (47,85°S

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Iván Pérez-Santos

2013-03-01

Full Text Available Con un microperfilador SCAMP (Self Contained Autonomous MicroProfile se detectó un proceso de Doble Difusión Convectiva (DDC, en los canales Martínez y Baker de la Patagonia central, Chile. Este perfilador midió temperatura y salinidad en la columna de agua con una resolución del orden de milímetros. El muestreo se efectuó en diciembre 2011, en 19 estaciones oceanográficas de ~55 m de profundidad. Los registros del microperfilador permitieron detectar la formación de escaleras termohalinas que caracterizan la formación de la DDC. Por medio del ángulo de Turner se confirmó que debajo de una capa superficial fuertemente estratificada (7-10 m se registraron eventos de DDC a profundidades entre 15 y 45 m. La DDC fue débil en la mayoría de los registros pero se evidenciaron eventos fuertes entre 15 y 40 m. En la capa subsuperficial, su origen se debió al intercalamiento de las masas aguas estuarinas (aguas frías y menos saladas encima de las oceánicas (aguas más cálidas y saladas, mientras que en la superficie la interacción océano-atmósfera favoreció su ocurrencia. La DDC en conjunto con el viento, las mareas y las ondas internas, puede constituir un mecanismo importante para la mezcla vertical, influenciando los flujos de calor, el hábitat de las especies marinas en estas profundidades y la exportación de carbono hacia los sedimentos.

Efectividad de la profilaxis analgésica con clonixinato de lisina en exodoncias: ensayo clínico aleatorio.

OpenAIRE

Pedro Aravena; Bruna Benso; Alejandra Bertín; Rocío Aravena-Torres

2013-01-01

RESUMEN Objetivo: Evaluar la efectividad de la profilaxis analgésica con dosis únicas de clonixinato de lisina (CL 125mg) en pacientes sometidos a extracciones dentales. Metodología: Ensayo clínico aleatorio, doble enmascaramiento placebo-controlado. Participaron pacientes ASA I y II con indicación de exodoncia dental de servicios públicos en la ciudad de Valdivia-Chile en el mes de octubre del 2012. Se asignó de manera aleatoria dos grupos: un grupo tratamiento quienes recibieron una dosis ...

Subiendo el listón: ¿como responde Finlandia al doble reto de la Educación secundaria?

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Pasi Sahlberg

2006-01-01

Full Text Available La Educación Secundaria ha estado en el centro del desarrollo de las políticas sociales y el sistema educativo en Finlandia durante las últimas tres décadas. Después de crear, en los años 70, una escuela comprensiva que dura nueve años y es igual para todos los alumnos, los objetivos de la política educativa han sido siempre que todos los que dejan la escuela básica puedan tener acceso a la educación superior que elijan. Hoy en día, el sistema educativo finlandés está considerado como un estándar internacional de la buena calidad, junto con su condición de equidad y acceso a todo el sistema. En este artículo, analizo el doble reto -o sea, calidad de y acceso a la educación secundaria- a través de tres dimensiones: la tasa de transición de la Educación Secundaria Básica a la Educación Secundaria Superior, tasas de finalización de la Educación Secundaria y el aprendizaje de los alumnos. Luego, argumento que Finlandia ha sido capaz de crear un sistema de Educación Secundaria que funciona bien a un coste razonable, porque ha utilizado estrategias de reforma educativa basadas en (1 una visión a largo plazo de una buena Educación Secundaria para todos, (2 mejorar la calidad de la Educación Primaria para todos los niños, (3 diseñar un sistema de intervención temprana y asesoramiento y consejo educativo en los centros educativos de Primaria y Secundaria, (4 ayudar a todos los alumnos a tener éxito en la transición de Primaria a Secundaria y crear caminos de segundas oportunidades para incrementar las tasas de éxito, y (5 promover la construcción de la capacidad lateral en la que las escuelas y los municipios aprenden unos de otros. La experiencia en Finlandia sugiere que mejorar la calidad de la Educación Secundaria requiere políticas sostenibles y liderazgo, cultivando profesionalidad y confianza en todo el sistema educativo, y acercamientos inteligentes al currículum y a la responsabilidad.

cobalt (ii), nickel (ii)

African Journals Online (AJOL)

DR. AMINU

Department of Chemistry Bayero University, P. M. B. 3011, Kano, Nigeria. E-mail: hnuhu2000@yahoo.com. ABSTRACT. The manganese (II), cobalt (II), nickel (II) and .... water and common organic solvents, but are readily soluble in acetone. The molar conductance measurement [Table 3] of the complex compounds in.

Cr(III,Mn(II,Fe(III,Co(II,Ni(II,Cu(II and Zn(II Complexes with Diisobutyldithiocarbamato Ligand

Directory of Open Access Journals (Sweden)

Mohammad Tarique

2011-01-01

Full Text Available The synthesis of sulphur and nitrogen containing dithiocarbamato ligand derived from diisobutylamine as well as its coordination compounds with 3d series transition metals is presented. These synthesized compounds were characterized on the basis of elemental analysis, conductometric measurements and IR spectral studies. The analytical data showed the stoichiometry 1:2 and 1:3 for the compounds of the types ML2 {M=Mn(II, Co(II, Ni(II, Cu(II and Zn(II} and M'L3{M'=Cr(III and Fe(III} respectively. The conductometric measurements proved the non-electrolytic behaviour of all the compounds. The bidentate nature of dithiocarbamato moiety was confirmed on the basis of IR spectral data.

La precipitación en el Pirineo español: diversidad espacial en las tendencias y escenarios futuros

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Vicente-Serrano, S. M.

2007-12-01

Full Text Available This paper analyses the spatial and temporal precipitation patterns in the Spanish Pyrenees since 1950. A multi-parametric approach is used by means of the analysis of total precipitation amount but also considering other important parameters such as the number of rainy days, the duration of the dry spells and the extreme precipitation events. Results show a general decrease of precipitation in second half of the twentieth century mainly in spring and summer. The precipitation decrease is mainly explained by the reduction in the frequency of the most intense precipitation events. Trend in rainy days has a great spatial and seasonal variability. The climate change models show in the Spanish Pyrenees a general decrease of precipitation amounts throughout the twentieth-one century, also showing a decrease in the frequency of days rainy, an increase of the intensity of the most extreme events and a noticeable increase in the duration of the dry spells.

En este trabajo se analizan los patrones espacio-temporales de las precipitaciones en el Pirineo español desde el año 1950 desde una perspectiva multiparamétrica, considerando no solo el volumen total de precipitación sino también diferentes parámetros que dan una importante información sobre la ocurrencia de las mismas, como el número de días de precipitación, las rachas secas y las precipitaciones extremas. Los resultados muestran un descenso generalizado de las precipitaciones a lo largo de la segunda mitad del siglo veinte, sobre todo durante la primavera y el verano. El descenso se explica fundamentalmente por la disminución de los eventos de mayor intensidad pues la tendencia en la frecuencia de días lluviosos tiene una gran variabilidad espacial. Los modelos de cambio climático muestran en sus predicciones un acusado descenso de las precipitaciones a lo largo del siglo veintiuno en el Pirineo, con un descenso en la frecuencia de días lluvioso, un aumento de la intensidad de

Efecto de la edad al primer parto y los días abiertos en un bovino doble propósito sobre la huella hídrica y de carbono

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Raúl Andrés Molina Benavides

2016-12-01

Full Text Available La actividad ganadera contribuye con la emisión de gases de efecto invernadero (EGEI y el consumo de agua fresca (CA. Por ende, el objetivo de esta investigación fue estimar el efecto de la edad al primer parto (EPP y los días abiertos (DA en un bovino doble propósito en pastoreo, trópico bajo colombiano, sobre las EGEI y el CA. Esta estimación se logró integrando 4 metodologías existentes: Dinámica de Sistemas, Large Ruminal Nutrition System, Huella de carbono y Huella hídrica. Durante toda su vida, 91 meses, desde el nacimiento hasta el sacrificio, la vaca produjo 5.879 kg de leche -4 lactancias-, emitió 16.066 kg CO2eq y consumió 12.804.569 L de agua. Al disminuir la EPP en un mes, el CA y  las EGEI se redujeron en 123.156 l y 155 kg CO2eq, respectivamente. Cuando se  mermaron los DA en 21, las EGEI bajaron 647 kg CO2eq y el CA se redujo en 455.455 L. Parámetros reproductivos como la EPP y los DA tienen una fuerte influencia sobre la dinámica del animal en el hato,  afectando su productividad, emisiones de gases de efecto invernadero y consumo de agua. 

Computer augumented modelling studies of Pb(II, Cd(II, Hg(II, Co(II, Ni(II, Cu(II and Zn(II complexes of L-glutamic acid in 1,2-propanediol–water mixtures

Directory of Open Access Journals (Sweden)

MAHESWARA RAO VEGI

2008-12-01

Full Text Available Chemical speciation of Pb(II, Cd(II, Hg(II, Co(II, Ni(II, Cu(II and Zn(II complexes of L-glutamic acid was studied at 303 K in 0–60 vol. % 1,2-propanediol–water mixtures, whereby the ionic strength was maintained at 0.16 mol dm-3. The active forms of the ligand are LH3+, LH2 and LH–. The predominant detected species were ML, ML2, MLH, ML2H and ML2H2. The trend of the variation in the stability constants with changing dielectric constant of the medium is explained based on the cation stabilizing nature of the co-solvents, specific solvent–water interactions, charge dispersion and specific interactions of the co-solvent with the solute. The effect of systematic errors in the concentrations of the substances on the stability constants is in the order alkali > > acid > ligand > metal. The bioavailability and transportation of metals are explained based on distribution diagrams and stability constants.

Fiscalidad de las transferencias internacionales de tecnología

OpenAIRE

Lucas Durán, Manuel Jesús

2008-01-01

I. Introducción. II. El reparto del poder tributario entre distintos estados: los convenios bilaterales para evitar la doble imposición. III. Concepto de ¿trasferencia de tecnología¿. 1. Concepto de canon por la cesión de uso de tecnología. IV. Fiscalidad directa de las transferencias internacionales de tecnología: 1. Transferencia Españaextranjero; 2. Transferencia extranjero-España. Bibliografía La innovación tecnológica es una de las actividades de mayor valor añadido ...

Synthesis and characterization of heterobimetallic complexes of the type [Cu(pn2][MCl4] where M = Co(II, Ni(II, Cu(II, Zn(II, Cd(II, and Hg(II

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Seema Yadav

2016-11-01

Full Text Available A series of new bimetallic transition metal complexes of the type [Cu(pn2] [MCl4] have been synthesized (where M = Co(II, Ni(II, Cu(II, Zn(II, Cd(II and Hg(II, pn = 1,3-diaminopropane and characterized by elemental analysis, molar conductance, TGA, IR and electronic spectra. All the compounds are 1:1 electrolyte in DMF. The Cu(II ion is square-planar while metal ions in the anionic moiety acquire their usual tetrahedral arrangement. On the basis of these studies it is concluded that anionic moiety is electrically stabilized by its cationic counterpart.

Small Diameter Bomb Increment II (SDB II)

Science.gov (United States)

2015-12-01

Selected Acquisition Report (SAR) RCS: DD-A&T(Q&A)823-439 Small Diameter Bomb Increment II (SDB II) As of FY 2017 President’s Budget Defense... Bomb Increment II (SDB II) DoD Component Air Force Joint Participants Department of the Navy Responsible Office References SAR Baseline (Production...Mission and Description Small Diameter Bomb Increment II (SDB II) is a joint interest United States Air Force (USAF) and Department of the Navy

Synthesis and structural characterization of nickel(II), cobalt(II), Zinc(II), manganese(II), cadmium(II) and uranium(VI) complexes of α-oximinoacetoacet-o/p-anisidide thiosemicarbazone

International Nuclear Information System (INIS)

Patel, P.S.; Patel, M.M.; Ray, R.M.

1993-01-01

A few metal complexes of α-oximinoacetoacet-o/p-anisidide thiosemicarbazones (OAOATS)/(OAPATS) with Ni(II), Co(II), Zn(II), Mn(II), Hg(II), Cd(II) and UO 2 (II) have been prepared and characterized by elemental analyses, conductivity, differential scanning calorimetry study, thermogravimetric analyses and infrared and electronic spectral measurements in conjunction with magnetic susceptibility measurements at room temperature. They have also been tested for their antimicrobial activities. (author). 24 refs., 2 tabs

Potencialidad de Cedrela odorata (Meliaceae para estudios dendrocronológicos en la selva central del Perú

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Manuel Jesús Pereyra Espinoza

2014-08-01

Full Text Available En este trabajo determinamos el potencial de Cedrela odorata para estudios dendrocronológicos en la Selva Central del Perú. Para ello, analizamos las características anatómicas que definen los anillos de crecimiento, desarrollamos una cronología de ancho de anillos y relacionamos el crecimiento de los árboles con los registros de precipitación. La cronología de ancho de anillos está compuesta por 47 series de 27 árboles y cubre el período 1795-2009. Los anillos están claramente delimitados por porosidad semicircular, asociados a bandas de parénquima marginal y paratraqueal. El crecimiento de los árboles estuvo relacionado con las precipitaciones de la estación lluviosa previa y con las de finales de la estación seca del corriente período de crecimiento. Así mismo, observamos una estrecha relación entre el crecimiento y las precipitaciones totales, considerando el ciclo hidrológico de diciembre a setiembre, para el periodo 1990-2009. Estos resultados indican la influencia de las precipitaciones en el crecimiento radial de C. odorata. La buena discriminación de los anillos anuales, la fuerte relación con la precipitación, el amplio rango de distribución y la longevidad de los árboles, hacen de C. odorata una especie promisoria para estudios dendrocli-matológicos y dendroecológicos en los bosques tropicales y subtropicales de América.

Competitive adsorption of copper(II), cadmium(II), lead(II) and zinc(II) onto basic oxygen furnace slag

International Nuclear Information System (INIS)

Xue Yongjie; Hou Haobo; Zhu Shujing

2009-01-01

Polluted and contaminated water can often contain more than one heavy metal species. It is possible that the behavior of a particular metal species in a solution system will be affected by the presence of other metals. In this study, we have investigated the adsorption of Cd(II), Cu(II), Pb(II), and Zn(II) onto basic oxygen furnace slag (BOF slag) in single- and multi-element solution systems as a function of pH and concentration, in a background solution of 0.01 M NaNO 3 . In adsorption edge experiments, the pH was varied from 2.0 to 13.0 with total metal concentration 0.84 mM in the single element system and 0.21 mM each of Cd(II), Cu(II), Pb(II), and Zn(II) in the multi-element system. The value of pH 50 (the pH at which 50% adsorption occurs) was found to follow the sequence Zn > Cu > Pb > Cd in single-element systems, but Pb > Cu > Zn > Cd in the multi-element system. Adsorption isotherms at pH 6.0 in the multi-element systems showed that there is competition among various metals for adsorption sites on BOF slag. The adsorption and potentiometric titrations data for various slag-metal systems were modeled using an extended constant-capacitance surface complexation model that assumed an ion-exchange process below pH 6.5 and the formation of inner-sphere surface complexes at higher pH. Inner-sphere complexation was more dominant for the Cu(II), Pb(II) and Zn(II) systems

Competitive adsorption of copper(II), cadmium(II), lead(II) and zinc(II) onto basic oxygen furnace slag

Energy Technology Data Exchange (ETDEWEB)

Xue Yongjie [School of Resource and Environment Science, Wuhan University, Hubei, Wuhan (China); Wuhan Kaidi Electric Power Environmental Protection Co. Ltd., Hubei, Wuhan (China)], E-mail: xueyj@mail.whut.edu.cn; Hou Haobo; Zhu Shujing [School of Resource and Environment Science, Wuhan University, Hubei, Wuhan (China)

2009-02-15

Polluted and contaminated water can often contain more than one heavy metal species. It is possible that the behavior of a particular metal species in a solution system will be affected by the presence of other metals. In this study, we have investigated the adsorption of Cd(II), Cu(II), Pb(II), and Zn(II) onto basic oxygen furnace slag (BOF slag) in single- and multi-element solution systems as a function of pH and concentration, in a background solution of 0.01 M NaNO{sub 3}. In adsorption edge experiments, the pH was varied from 2.0 to 13.0 with total metal concentration 0.84 mM in the single element system and 0.21 mM each of Cd(II), Cu(II), Pb(II), and Zn(II) in the multi-element system. The value of pH{sub 50} (the pH at which 50% adsorption occurs) was found to follow the sequence Zn > Cu > Pb > Cd in single-element systems, but Pb > Cu > Zn > Cd in the multi-element system. Adsorption isotherms at pH 6.0 in the multi-element systems showed that there is competition among various metals for adsorption sites on BOF slag. The adsorption and potentiometric titrations data for various slag-metal systems were modeled using an extended constant-capacitance surface complexation model that assumed an ion-exchange process below pH 6.5 and the formation of inner-sphere surface complexes at higher pH. Inner-sphere complexation was more dominant for the Cu(II), Pb(II) and Zn(II) systems.

Competitive adsorption of copper(II), cadmium(II), lead(II) and zinc(II) onto basic oxygen furnace slag.

Science.gov (United States)

Xue, Yongjie; Hou, Haobo; Zhu, Shujing

2009-02-15

Polluted and contaminated water can often contain more than one heavy metal species. It is possible that the behavior of a particular metal species in a solution system will be affected by the presence of other metals. In this study, we have investigated the adsorption of Cd(II), Cu(II), Pb(II), and Zn(II) onto basic oxygen furnace slag (BOF slag) in single- and multi-element solution systems as a function of pH and concentration, in a background solution of 0.01M NaNO(3). In adsorption edge experiments, the pH was varied from 2.0 to 13.0 with total metal concentration 0.84mM in the single element system and 0.21mM each of Cd(II), Cu(II), Pb(II), and Zn(II) in the multi-element system. The value of pH(50) (the pH at which 50% adsorption occurs) was found to follow the sequence Zn>Cu>Pb>Cd in single-element systems, but Pb>Cu>Zn>Cd in the multi-element system. Adsorption isotherms at pH 6.0 in the multi-element systems showed that there is competition among various metals for adsorption sites on BOF slag. The adsorption and potentiometric titrations data for various slag-metal systems were modeled using an extended constant-capacitance surface complexation model that assumed an ion-exchange process below pH 6.5 and the formation of inner-sphere surface complexes at higher pH. Inner-sphere complexation was more dominant for the Cu(II), Pb(II) and Zn(II) systems.

Preparation of Schiff s base complexes of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) and their spectroscopic, magnetic, thermal, and antifungal studies

International Nuclear Information System (INIS)

Parekh, H.M.; Patel, M.N.

2006-01-01

The potassium salt of salicylidene-DL-alanine (KHL), bis(benzylidene)ethylenediamine (A 1 ), thiophene-o-carboxaldene-p-toluidine (A 2 ), and its metal complexes of the formula [(M II (L)(A)(H 2 O)] (M=Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II); A = A 1 or A 2 ) are prepared. They are characterized by elemental analysis, magnetic susceptibility measurements, thermogravimetric analysis, and infrared and electronic spectral studies. The electronic spectral and magnetic moment data suggest an octahedral geometry for the complexes. All of these complexes, metal nitrates, fungicides (bavistin and emcarb), and ligands are screened for their antifungal activity against Aspergillus niger, Fusarium oxysporum, and Aspergillus flavus using a plate poison technique. The complexes show higher activity than those of the free ligands, metal nitrate, and the control (DMSO) and moderate activity against bavistin and emcarb [ru

Cu(II) AND Zn(II)

African Journals Online (AJOL)

Preferred Customer

SYNTHESIS OF 2,2-DIMETHYL-4-PHENYL-[1,3]-DIOXOLANE USING ZEOLITE. ENCAPSULATED Co(II), Cu(II) AND Zn(II) COMPLEXES. B.P. Nethravathi1, K. Rama Krishna Reddy2 and K.N. Mahendra1*. 1Department of Chemistry, Bangalore University, Bangalore-560001, India. 2Department of Chemistry, Government ...

Spectroscopic and thermal degradation behavior of Mg(II, Ca(II, Ba(II and Sr(II complexes with paracetamol drug

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Moamen S. Refat

2017-05-01

Full Text Available Complexes of Mg(II, Ca(II, Ba(II and Sr(II with paracetamol drug were synthesized and characterized by elemental analysis, conductivity, UV–Vis, IR, and 1H NMR spectroscopy and thermal analysis, as well as screened for antimicrobial activity. The IR spectral data suggested that the ligand behaves as paracetamol behaves as a neutral bidentate ligand coordinated to the metal ions via the lone pair of electrons of nitrogen and carbonyl-O atoms of the amide group. From the microanalytical data, the stoichiometry of the complexes reacts with Mg(II, Ca(II, Ba(II and Sr(II by molar ratios (2:1 (paracetamol:metal ion. The thermal behavior (TG/DTG of the complexes was studied. The ligand and their metal complexes were screened against both of antibacterial and fungicidal activities.

Efecto de la densidad de población y la fertilización en el cultivo de soya (Glycine max (L Merr de doble producción (forraje y grano

Directory of Open Access Journals (Sweden)

Forero P. Jaime A.

1986-03-01

Full Text Available En el estudio se utilizó un diseño de parcelas divididas, correspondiendo la fertilización a las parcelas principales y a las sub parcelas las tres densidades de población. La soya puede utilizarse como planta de doble fin. Con una población de 360000 plantas/ha con fertilización se logra la mejor producción de forraje en materia seca (865.44 kg/ha y la máxima producción de grano (1073 kq/ha. Se considera que este es el primer trabajo que se realiza en Colombia en donde se utiliza la soya como planta forrajera y a la vez productora de grano en condiciones de campo.The possibility of developing a "double production" (green forage and grain system, the influence of population densities and fertilization on soybean were studied. A design of divided plots was used (main plots: fertilization and subplots: three population densities l. The soybean can be used as a double purpose plant. A population density of 360000 plants/ha with fertilization gives the best forage yield in dry matter (865.44 kg/ha and the maximum grain production (1073 kq/ha. This work is considered to be the first done in Colombia using soybean as forage and grain producer under field conditions.

Solar photocatalytic removal of Cu(II), Ni(II), Zn(II) and Pb(II): Speciation modeling of metal-citric acid complexes

International Nuclear Information System (INIS)

Kabra, Kavita; Chaudhary, Rubina; Sawhney, R.L.

2008-01-01

The present study is targeted on solar photocatalytic removal of metal ions from wastewater. Photoreductive deposition and dark adsorption of metal ions Cu(II), Ni(II), Pb(II) and Zn(II), using solar energy irradiated TiO 2 , has been investigated. Citric acid has been used as a hole scavenger. Modeling of metal species has been performed and speciation is used as a tool for discussing the photodeposition trends. Ninety-seven percent reductive deposition was obtained for copper. The deposition values of other metals were significantly low [nickel (36.4%), zinc (22.2%) and lead (41.4%)], indicating that the photocatalytic treatment process, using solar energy, was more suitable for wastewater containing Cu(II) ions. In absence of citric acid, the decreasing order deposition was Cu(II) > Ni(II) > Pb(II) > Zn(II), which proves the theoretical thermodynamic predictions about the metals

Cd(II), Cu(II)

African Journals Online (AJOL)

user

Depending on the way goethite was pretreated with oxalic acid, affinity for Cd(II) varied ...... Effects and mechanisms of oxalate on Cd(II) adsorption on goethite at different ... precipitation, surfactant mediation, hydrothermal and micro-emulsion.

Sequestration of Cu(II), Ni(II), and Co(II) by ethyleneimine immobilized on silica

International Nuclear Information System (INIS)

Arakaki, Luiza N.H.; Alves, Ana Paula M.; Silva Filho, Edson C. da; Fonseca, Maria G.; Oliveira, Severino F.; Espinola, Jose Geraldo P.; Airoldi, Claudio

2007-01-01

Thermodynamic data on interaction of Cu(II), Ni(II), and Co(II) with silica modified with ethyleneimine are obtained by calorimetric titration. The amount of ethyleneimine anchored on silica surface was estimated to be 0.70 mmol g -1 . The enthalpies of binding Ni(II), Cu(II) and Co(II), are -3.59 ± 0.001, -4.88 ± 0.001, and -7.75 ± 0.003 kJ mol -1 , respectively

Double non-taxation and the use of hybrid entities

OpenAIRE

Parada Pino, Leopoldo

2017-01-01

La tesis analiza la interacción entre la doble no imposición y el uso de entidades híbridas dentro del contexto internacional, lo que incluye la aplicación de tratados internacionales para evitar la doble imposición. En este sentido, y contrariamente a la opinión mayoritaria de la doctrina fiscal internacional, el autor argumenta que la doble no imposición debería ser entendida de acuerdo a su naturaleza de resultado, es decir, no debería considerarse per se como un problema internacional ni ...

Efectos de la actividad humana en la cuenca del río San Carlos

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Adolfo Chaves Campos

Full Text Available Se analizó el efecto de las actividades agropecuarias en los recursos hídricos de la cuenca del río San Carlos, ubicado en la región noreste de Costa Rica, cuyo uso es fundamentalmente agropecuario. Los indicadores utilizados fueron: ph, temperatura, fosfatos, nitratos, oxígeno disuelto, sólidos totales, coliformes fecales y totales. Se determinó cuáles son los plaguicidas más utilizados y su impacto en el recurso hídrico; se verificó el arrastre de fertilizantes y partículas sólidas del suelo producto de la escorrentía superficial como consecuencia de las altas precipitaciones en zonas de explotación ganadera y cultivos, principalmente de caña de azúcar, piña, cítricos. Se encontró que existe una alta relación entre el nivel de las precipitaciones y la presencia de contaminantes en el cauce principal y cauces secundarios de la cuenca.

Solid-phase extraction of Mn(II), Co(II), Ni(II), Cu(II), Cd(II) and Pb(II) ions from environmental samples by flame atomic absorption spectrometry (FAAS)

Energy Technology Data Exchange (ETDEWEB)

Duran, Celal [Department of Chemistry, Faculty of Art and Science, Karadeniz Technical University, 61080 Trabzon (Turkey); Gundogdu, Ali [Department of Chemistry, Faculty of Art and Science, Karadeniz Technical University, 61080 Trabzon (Turkey); Bulut, Volkan Numan [Department of Chemistry, Giresun Faculty of Art and Science, Karadeniz Technical University, 28049 Giresun (Turkey); Soylak, Mustafa [Department of Chemistry, Faculty of Art and Science, Erciyes University, 38039 Kayseri (Turkey)]. E-mail: soylak@erciyes.edu.tr; Elci, Latif [Department of Chemistry, Faculty of Art and Science, Pamukkale University, 20020 Denizli (Turkey); Sentuerk, Hasan Basri [Department of Chemistry, Faculty of Art and Science, Karadeniz Technical University, 61080 Trabzon (Turkey); Tuefekci, Mehmet [Department of Chemistry, Faculty of Art and Science, Karadeniz Technical University, 61080 Trabzon (Turkey)

2007-07-19

A new method using a column packed with Amberlite XAD-2010 resin as a solid-phase extractant has been developed for the multi-element preconcentration of Mn(II), Co(II), Ni(II), Cu(II), Cd(II), and Pb(II) ions based on their complex formation with the sodium diethyldithiocarbamate (Na-DDTC) prior to flame atomic absorption spectrometric (FAAS) determinations. Metal complexes sorbed on the resin were eluted by 1 mol L{sup -1} HNO{sub 3} in acetone. Effects of the analytical conditions over the preconcentration yields of the metal ions, such as pH, quantity of Na-DDTC, eluent type, sample volume and flow rate, foreign ions etc. have been investigated. The limits of detection (LOD) of the analytes were found in the range 0.08-0.26 {mu}g L{sup -1}. The method was validated by analyzing three certified reference materials. The method has been applied for the determination of trace elements in some environmental samples.

El uso de fotocélulas de haz simple y doble para medir la velocidad en carreras®. The use of single- and dual-beam photocells to measure the sprint time®.

Directory of Open Access Journals (Sweden)

Juan García-López

2012-10-01

Full Text Available ResuemnEl objetivo del estudio fue analizar la influencia de la tecnología de las fotocélulas en el registro de tiempo y su fiabilidad durante de carreras de velocidad de corta distancia. Participaron 25 estudiantes (20.5±0.5 años; 1.78±0.02 m; 77.5±1.8 kg que fueron evaluados en 3 días (2 de familiarización y 1 de test. Se registraron aleatoriamente 3 carreras de aceleración y 3 velocidad lanzada, cronometradas simultáneamente a los 5, 10 y 15 m por dos sistemas de fotocélulas DSD Laser System®: haz simple y doble haz. El tipo de fotocélulas utilizadas influyó en el tiempo de carrera (F=11.92 y p 0.80 a los 10 y 5 m, respectivamente. En la carrera lanzada ambos sistemas midieron prácticamente igual (diferencias de ~0.005 s, obteniendo registros fiables a los 15 y 10 m, respectivamente. En conclusión, en carreras de aceleración la distancia mínima a registrar con haz simple debe ser de 10 m, y de 5 m con haz doble, mientras que en carreras lanzadas deberían utilizarse unas distancias mínimas de 15 y 10 m, respectivamente. Futuros estudios deberían analizar la distancia óptima a la primera fotocélula en las carreras de aceleración, para aumentar la fiabilidad de la medición y facilitar la comparación entre registros de diferentes estudios.AbstractThe purpose was to analyze the influence of the timing gates’ technology on both running time performance and its reliability during short sprint distances. Twenty-five physical students participated (20.5±0.5 yr; 1.78±0.02 m; 77.5±1.8 kg, whose were evaluated during 3 separate days (2 familiarization sessions and 1 testing session. Three standing-start and 3 flying-start runs were randomized and simultaneously registered at 5, 10 and 15 m by two timing gates DSD Laser System®: single- and dual-beam. The type of timing gates affected the performance (F=11.92 y p0.80 at the distances of 10 and 5 m, respectively. During the flying-start runs, both systems obtained a very

Average [O II] nebular emission associated with Mg II absorbers: dependence on Fe II absorption

Science.gov (United States)

Joshi, Ravi; Srianand, Raghunathan; Petitjean, Patrick; Noterdaeme, Pasquier

2018-05-01

We investigate the effect of Fe II equivalent width (W2600) and fibre size on the average luminosity of [O II] λλ3727, 3729 nebular emission associated with Mg II absorbers (at 0.55 ≤ z ≤ 1.3) in the composite spectra of quasars obtained with 3 and 2 arcsec fibres in the Sloan Digital Sky Survey. We confirm the presence of strong correlations between [O II] luminosity (L_{[O II]}) and equivalent width (W2796) and redshift of Mg II absorbers. However, we show L_{[O II]} and average luminosity surface density suffer from fibre size effects. More importantly, for a given fibre size, the average L_{[O II]} strongly depends on the equivalent width of Fe II absorption lines and found to be higher for Mg II absorbers with R ≡W2600/W2796 ≥ 0.5. In fact, we show the observed strong correlations of L_{[O II]} with W2796 and z of Mg II absorbers are mainly driven by such systems. Direct [O II] detections also confirm the link between L_{[O II]} and R. Therefore, one has to pay attention to the fibre losses and dependence of redshift evolution of Mg II absorbers on W2600 before using them as a luminosity unbiased probe of global star formation rate density. We show that the [O II] nebular emission detected in the stacked spectrum is not dominated by few direct detections (i.e. detections ≥3σ significant level). On an average, the systems with R ≥ 0.5 and W2796 ≥ 2 Å are more reddened, showing colour excess E(B - V) ˜ 0.02, with respect to the systems with R < 0.5 and most likely trace the high H I column density systems.

Structural information on the coordination compounds formed by manganese(II), cobalt(II), nickel(II), zinc(II), cadmium(II) and mercury(II) thiocyanates with 4-cyanopyridine N-oxide from their magnetic moments, electronic and infrared spectra

Science.gov (United States)

Ahuja, I. S.; Yadava, C. L.; Singh, Raghuvir

1982-05-01

Coordination compounds formed by the interaction of 4-cyanopyridine. N-oxide (4-CPO), a potentially bidentate ligand, with manganese(II), cobalt(II), nickel(II), zinc(II), cadmium(II) and rnercury(II) thiocyanates have been prepared and characterized from their elemental analyses, magnetic susceptibilities, electronic and infrared spectral studies down to 200 cm -1 in the solid state. The compounds isolated are: Mn(4-CPO) 2(NCS) 2, Co(4-CPO) 2(NCS) 2,Ni(4-CPO) 2(NCS) 2,Zn(4-CPO) 2(NCS) 2, Cd(4-CPO)(NCS) 2 and Hg(4-CPO) 2(SCN) 2. It is shown that 4-CPO acts as a terminal N-oxide oxygen bonded monodentate ligand in all the metal(II) thiocyanate complexes studied. Tentative stereochemistries of the complexes in the solid state are discussed. The ligand field parameters 10 Dq, B, β and λ calculated for the manganese(II), cobalt(II) and nickel(II) complexes are consistent with their proposed stereochemistries.

Macrocyclic receptor showing extremely high Sr(II)/Ca(II) and Pb(II)/Ca(II) selectivities with potential application in chelation treatment of metal intoxication.

Science.gov (United States)

Ferreirós-Martínez, Raquel; Esteban-Gómez, David; Tóth, Éva; de Blas, Andrés; Platas-Iglesias, Carlos; Rodríguez-Blas, Teresa

2011-04-18

Herein we report a detailed investigation of the complexation properties of the macrocyclic decadentate receptor N,N'-Bis[(6-carboxy-2-pyridil)methyl]-4,13-diaza-18-crown-6 (H(2)bp18c6) toward different divalent metal ions [Zn(II), Cd(II), Pb(II), Sr(II), and Ca(II)] in aqueous solution. We have found that this ligand is especially suited for the complexation of large metal ions such as Sr(II) and Pb(II), which results in very high Pb(II)/Ca(II) and Pb(II)/Zn(II) selectivities (in fact, higher than those found for ligands widely used for the treatment of lead poisoning such as ethylenediaminetetraacetic acid (edta)), as well as in the highest Sr(II)/Ca(II) selectivity reported so far. These results have been rationalized on the basis of the structure of the complexes. X-ray crystal diffraction, (1)H and (13)C NMR spectroscopy, as well as theoretical calculations at the density functional theory (B3LYP) level have been performed. Our results indicate that for large metal ions such as Pb(II) and Sr(II) the most stable conformation is Δ(δλδ)(δλδ), while for Ca(II) our calculations predict the Δ(λδλ)(λδλ) form being the most stable one. The selectivity that bp18c6(2-) shows for Sr(II) over Ca(II) can be attributed to a better fit between the large Sr(II) ions and the relatively large crown fragment of the ligand. The X-ray crystal structure of the Pb(II) complex shows that the Δ(δλδ)(δλδ) conformation observed in solution is also maintained in the solid state. The Pb(II) ion is endocyclically coordinated, being directly bound to the 10 donor atoms of the ligand. The bond distances to the donor atoms of the pendant arms (2.55-2.60 Å) are substantially shorter than those between the metal ion and the donor atoms of the crown moiety (2.92-3.04 Å). This is a typical situation observed for the so-called hemidirected compounds, in which the Pb(II) lone pair is stereochemically active. The X-ray structures of the Zn(II) and Cd(II) complexes show that

Solid Phase Extraction of Trace Al(III), Fe(II), Co(II), Cu(II), Cd(II) and Pb(II) Ions in Beverages on Functionalized Polymer Microspheres Prior to Flame Atomic Absorption Spectrometric Determinations.

Science.gov (United States)

Berber, Hale; Alpdogan, Güzin

2017-01-01

In this study, poly(glycidyl methacrylate-methyl methacrylate-divinylbenzene) was synthesized in the form of microspheres, and then functionalized by 2-aminobenzothiazole ligand. The sorption properties of these functionalized microspheres were investigated for separation, preconcentration and determination of Al(III), Fe(II), Co(II), Cu(II), Cd(II) and Pb(II) ions using flame atomic absorption spectrometry. The optimum pH values for quantitative sorption were 2 - 4, 5 - 8, 6 - 8, 4 - 6, 2 - 6 and 2 - 3 for Al(III), Fe(II), Co(II), Cu(II), Cd(II) and Pb(II), respectively, and also the highest sorption capacity of the functionalized microspheres was found to be for Cu(II) with the value of 1.87 mmol g -1 . The detection limits (3σ; N = 6) obtained for the studied metals in the optimal conditions were observed in the range of 0.26 - 2.20 μg L -1 . The proposed method was successfully applied to different beverage samples for the determination of Al(III), Fe(II), Co(II), Cu(II), Cd(II) and Pb(II) ions, with the relative standard deviation of <3.7%.

Efecto de la ingesta de un preparado lácteo con fibra dietética sobre el estreñimiento crónico primario idiopático The effect of a fibre enriched dietary milk product in chronic primary idiopatic constipation

OpenAIRE

J. López Román; A. B. Martínez Gonzálvez; A. Luque; J. A. Pons Miñano; A. Vargas Acosta; J. R. Iglesias; M. Hernández

2008-01-01

Objetivo: Determinar si la administración de un preparado lácteo enriquecido con un suplemento de fibra soluble (Naturfibra)®[inulina y maltodextrina resistente a la digestión (Fibersol 2®)], afecta a la sintomatología en el estreñimiento crónico primario idiopático. Ámbito: Sujetos de ambos sexos con estreñimiento según los criterios de Roma II. Sujetos: Se trata de un ensayo clínico doble ciego aleatorizado de intervención dietética realizado en 32 individuos con estreñimiento de ambos sexo...

Synthesis, characterization and thermal studies of nickel (II), copper (II), zinc (II) and cadmium (II) complexes with some mixed ligands

International Nuclear Information System (INIS)

Mitra, Samiran; Kundu, Parimal; Singh, Rajkumar Bhubon

1998-01-01

Dichloro-(DCA) and trichloroacetate(TCA) -cyclic ligand morpholine (Morph)/thiomorpholine (Tmorph)/methylmorpholine (Mmorph)/dimethyl-piperazine (DMP) complexes of nickel (II), copper (II), zinc (II) and cadmium (II) with the compositions [Ni(tmorph) 2 (DCA) 2 ], [Ni(tmorph) 2 (TCA) 2 ].2H 2 O, [Cu(DMP) 2 (TCA) 2 ],[ML 2 X 2 ].nH 2 O where M=Zn II or Cd II , L=Morph, DMP or tmorph and X=DCA or TCA and n=O except in case of [Cd (Morph) 2 (TCA) 2 ] where n=1 have been synthesised. Some intermediate complexes have been isolated by temperature arrest technique (pyrolysis) and characterised. Configurational and conformational changes have been studied by elemental analyses, IR and electronic spectra, magnetic moment data (in the case of Ni(II) and Cu(II) complexes) and thermal analysis. E a * , ΔH, and ΔS for the decomposition reaction of these complexes are evaluated and the stability of the complexes with respect to activation energy has also been compared. The linear correlation has been found between E a * and ΔS for the decomposition of the complexes. (author)

El silencio entre los profesionales de la salud, un arma de doble filo: a double-sided argument Silence among health care professionals

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Juan M. Leyva-Moral

2008-03-01

Full Text Available Justificación: el silencio dentro del lugar de trabajo se asocia con diversas causas, siendo el miedo, la desvinculación y la cooperación las principales razones que llevan al empleado a permanecer en silencio. Objetivo: explorar el significado que tiene el silencio entre los profesionales de la salud. Metodología: estudio cualitativo basado en la Teoría Fundamentada. Se utilizó la entrevista semi-estructurada y un cuestionario con preguntas abiertas. Resultados: tres categorías emergen del análisis de los textos: a Silencio como "un arma de doble filo" ya que se le asocian efectos positivos pero también negativos. b "prevención de consecuencias venideras" explora las situaciones y los motivos en los que los participantes consideran que es mejor permanecer en silencio. C "¡Yo no me callo!" aparece como resultado del análisis de aquellos participantes que siempre dicen lo que piensan. Conclusión: el silencio en el ámbito laboral genera sentimientos perjudiciales a nivel individual, tales como baja autoestima, frustración o rabia, mientras que a nivel grupal puede producir mayor cohesión por no haber discusiones de ningún tipo. No obstante, la calidad de la producción puede verse mermada ya que las personas se dedican a "seguir la corriente".Justification: silence in the workplace is associated with many causes, such as fear, deattachement and cooperation. Aim: to explore the meaning of silence among the healthcare professionals. Methodology: qualitative stuyd based on Grounded Theory. Semi-structured interviews were used as well as a questionnaire with open ended questions. Findings: three main domains emerge from the data anlysis: a Silence as a double-sided argument, b prevention of future consequences; c I don’t keep silent! Conclusion: silence within the workplace generates negative feelings at an individual level, such as low self-steem, frustration or anger. In a grupal level, silence can produce higher cohesi

Competition from Cu(II), Zn(II) and Cd(II) in Pb(II) binding to Suwannee River Fulvic Acid

NARCIS (Netherlands)

Chakraborty, P.; Chakrabarti, C.L.

2008-01-01

This is a study of trace metal competition in the complexation of Pb(II) by well-characterized humic substances, namely Suwannee River Fulvic Acid (SRFA) in model solutions. It was found that Cu(II) seems to compete with Pb(II) for strong binding sites of SRFA when present at the same concentration

Synthesis, investigation and spectroscopic characterization of piroxicam ternary complexes of Fe(II), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) with glycine and DL-phenylalanine

Science.gov (United States)

Mohamed, Gehad G.; El-Gamel, Nadia E. A.

2004-11-01

The ternary piroxicam (Pir; 4-hydroxy-2-methyl- N-(2-pyridyl)-2H-1,2-benzothiazine-3-carboxamide 1,1-dioxide) complexes of Fe(II), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) with various amino acids (AA) such as glycine (Gly) or DL-phenylalanine (PhA) were prepared and characterized by elemental analyses, molar conductance, IR, UV-Vis, magnetic moment, diffuse reflectance and X-ray powder diffraction. The UV-Vis spectra of Pir and the effect of metal chelation on the different interligand transitions are discussed in detailed manner. IR and UV-Vis spectra confirm that Pir behaves as a neutral bidentate ligand coordinated to the metal ions via the pyridine- N and carbonyl group of the amide moiety. Gly molecule acted as a uninegatively monodentate ligand and coordinate to the metal ions through its carboxylic group, in addition PhA acted as a uninegatively bidentate ligand and coordinate to the metal ions through its carboxylic and amino groups. All the chelates have octahedral geometrical structures while Cu(II)- and Zn(II)-ternary chelates with PhA have square planar geometrical structures. The molar conductance data reveal that most of these chelates are non electrolytes, while Fe(III)-Pir-Gly, Co(II)-, Ni(II)-, Cu(II)- and Zn(II)-Pir-PhA cheletes were 1:1 electrolytes. X-ray powder diffraction is used as a new tool to estimate the crystallinity of chelates as well as to elucidate their geometrical structures.

Coordination compounds of cobalt(II), nickel(II), copper(II), and zinc(II) with pantothenic acid

Energy Technology Data Exchange (ETDEWEB)

Shabilalov, A.A.; Yunuskhodzhaev, A.N.; Khodzhaev, O.F.; Azizov, M.A.

1986-11-01

The compounds Ni(PANA - H)/sub 2/ x 4H/sub 2/O (PANA stands for pantothenic acid, and - H indicates a deprotonated ligand), Cu(PANA - H)/sub 2/ x 2H/sub 2/O, Zn(PANA - H)/sub 2/ x H/sub 2/O, Co(PANA - H)Cl x H/sub 2/O, and Ni(PANA - H)Cl x 3H/sub 2/O have been synthesized on the basis of pantothenic acid and Co(II), Ni(II), Cu(II), and Zn(II) salts in aqueous media. The compounds have been identified by elemental and x-ray diffraction analysis. Some physicochemical properties (solubility, melting point, molar conductivity) of the compounds obtained have been studied. The structure of the compounds isolated has been established on the basis of an analysis of their IR, ESR, and electronic spectra, as well as derivatograms.

Spectroscopic and thermal degradation behavior of Mg(II), Ca(II), Ba(II) and Sr(II) complexes with paracetamol drug

OpenAIRE

Moamen S. Refat; Gehad G. Mohamed; Mohamed Y. El-Sayed; Hamada M.A. Killa; Hammad Fetooh

2017-01-01

Complexes of Mg(II), Ca(II), Ba(II) and Sr(II) with paracetamol drug were synthesized and characterized by elemental analysis, conductivity, UV–Vis, IR, and 1H NMR spectroscopy and thermal analysis, as well as screened for antimicrobial activity. The IR spectral data suggested that the ligand behaves as paracetamol behaves as a neutral bidentate ligand coordinated to the metal ions via the lone pair of electrons of nitrogen and carbonyl-O atoms of the amide group. From the microanalytical dat...

Optimization of simultaneous electrochemical determination of Cd(II), Pb(II), Cu(II) and Hg(II) at carbon nanotube-modified graphite electrodes.

Science.gov (United States)

Pikna, L'ubomír; Heželová, Mária; Kováčová, Zuzana

2015-01-01

The health of the environment is worsening every day. Monitoring of potentially toxic elements and remediation of environmental pollution are necessary. Therefore, the research and development of simple, inexpensive, portable and effective sensors is important. Electrochemistry is a useful component of the field of environment monitoring. The present study focuses on evaluating and comparing three types of electrodes (PIGE, PIGE/MWCNT/HNO3 and PIGE/MWCNT/EDTA/HNO3) employed for the simultaneous electrochemical determination of four potentially toxic elements: Cd(II), Pb(II), Cu(II) and Hg(II). Cyclic voltammograms were measured in an acetate buffer. The LOD, LOQ, the standard and relative precisions of the method and a prediction intervals were calculated (according to the technical procedure DIN 32 645) for the three electrodes and for each measured element. The LOD for PIGE/CNT/HNO3 (the electrode with narrowest calculated prediction intervals) was 2.98 × 10(-7) mol L(-1) for Cd(II), 4.83 × 10(-7) mol L(-1) for Pb(II), 3.81 × 10(-7) mol L(-1) for Cu(II), 6.79 × 10(-7) mol L(-1) for Hg(II). One of the benefits of this study was the determination of the amount of Hg(II) in the mixture of other elements.

La doble jerarquía del desarrollo económico y gobierno local en Chile: El caso de la salmonicultura y los municipios chilotes

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Arnt Fløysand

2010-08-01

Full Text Available A partir de los procesos recientes de reestructuración regional y desarrollo de la provincia de Chiloé, Chile, las comunidades tradicionales se ven enfrentadas a la “glocalización” de su base económica y de sus aspectos socioculturales. Se señala el punto de vista de las municipalidades en relación a los impactos generados por la industria salmonera y a las facultades con que cuenta el nivel local para manejarlos. Se demuestra que la salmonicultura en Chiloé no parece conducir a un ejemplo exitoso de reestructuración espacial, desarrollándose un sistema de innovación global, sin que los actores locales estén integrados e infuyan sobre las decisiones tomadas en los territorios sobre los cuales ejercen un rol y responsabilidad democrática. Se ve claramente la existencia de una doble jerarquía entre responsabilidades político-administrativas locales y el aparato público-privado para fomentar el desarrollo económico local, lo que debilita las estructuras locales democráticas en la búsqueda del crecimiento económico nacional.Given recent processes of regional restructuring and provincial development in Chiloé, Chile, traditional communities have witnessed the 'glocalisation of their economic base and socio-cultural aspects of their lives. Te article focuses on the municipal position in terms of the impacts generated by salmon aquaculture and the faculties that they exercise at the local level to manage them. It reveals that the salmon aquaculture industry in Chiloé does not appear to provide a successful example of spatial restructuring, developing a global innovation system without the full integration of local actors in decision-making in the territories over which they have a democratic role and responsibility. Tere is clear evidence of a double hierarchy between political-administrative responsibilities and the public-private apparatus for local economic development, which weakens local democratic structures in the

Synthesis, spectral characterization thermal stability, antimicrobial studies and biodegradation of starch–thiourea based biodegradable polymeric ligand and its coordination complexes with [Mn(II), Co(II), Ni(II), Cu(II), and Zn(II)] metals

OpenAIRE

Nahid Nishat; Ashraf Malik

2016-01-01

A biodegradable polymer was synthesized by the modification reaction of polymeric starch with thiourea which is further modified by transition metals, Mn(II), Co(II), Ni(II), Cu(II) and Zn(II). All the polymeric compounds were characterized by (FT-IR) spectroscopy, 1H NMR spectroscopy, 13C NMR spectroscopy, UV–visible spectra, magnetic moment measurements, thermogravimetric analysis (TGA) and antibacterial activities. Polymer complexes of Mn(II), Co(II) and Ni(II) show octahedral geometry, wh...

Extraction studies of Cd(II), Cu(II), Mn(II), Ni(II) and Zn(II) using N, N', N, N' -Bis((2-hydroxy-3,5-di-tert-butylbenzyl) (2-pyridylmethyl)) -ethylenediamine as a novel ligand

International Nuclear Information System (INIS)

Laus, R.; Anjos, A.D.; Naves, A.

2008-01-01

In the present study, the use of N,N',N,N'-bis((2-hydroxy-3,5-di-tert-butylbenzyl) (2- pyridylmethyl))-ethylenediamine (H2L) as ligand was evaluated in the liquid-liquid (water- chloroform) extraction of Cd(II), Cu(II), Mn(II), Ni(II) and Zn(II). Experiments were carried out to determine the pH for maximum extraction for each metal ion by ligand, maximum extraction capacity, extraction kinetics and extraction selectivity. The results revealed that the extraction of metal ions is dependent on the pH: maximum extraction maximum was obtained in the pH range of 4.5 - 6.0 for Cu(II) and 8.0 - 9.0 for Zn(II). Cd(II) and Mn(II) were best extracted at pH 9.0 and Ni(II) at 10.0. The ligand H2L was effective for the extraction of Cd(II), Cu(II) and Zn(II) (extraction efficient, %E equal 100%), whereas %E of 76% and 23.5% were observed for Mn(II) and Ni(II), respectively. The ligand presented high selectivity for the extraction of Cu(II) at pH 4.0. (author)

Preparation and Spectral Properties of Mixed-Ligand Complexes of VO(IV, Ni(II, Zn(II, Pd(II, Cd(II and Pb(II with Dimethylglyoxime and N-acetylglycine

Directory of Open Access Journals (Sweden)

Shayma A. Shaker

2010-01-01

Full Text Available A number of mixed-ligand complexes of the general formula [M(D(G] where D=dimethylglyoximato monoanion, G=N-acetylglycinato and M=VO(IV, Ni(II, Zn(II, Pd(II, Cd(II and Pb(II were prepared. Each complex was characterized by elemental analysis, determination of metal, infrared spectra, electronic spectra, (1H and 13C NMR spectra, conductivity and magnetic moments. All these complexes were not soluble in some of the organic solvent but highly soluble in dimethylformamide. The conductivity data showed the non-electrolytic nature of the complexes. The electronic spectra exhibited absorption bands in the visible region caused by the d-d electronic transition such as VO(IV, Ni(II and Pd(II. The IR and (1H, 13C NMR spectra which have indicate that the dimethylglyoxime was coordinated with the metal ions through the N and O atoms of the oxime group and N-acetylglycine was coordinated with metal ions through the N atom and terminal carboxyl oxygen atom.

Synthesis and characterization of polychelates of Cu(II), Ni(II), Co(II), Mn(II), Zn(II), oxovanadium(IV) and dioxouranium(VI) with 2,4-dihydroxybenzaldehyde-urea-formaldehyde polymer

International Nuclear Information System (INIS)

Patel, G.C.; Pancholi, H.B.; Patel, M.M.

1991-01-01

Polychelates of Cu(II), Ni(II), Co(II), Mn(II), Zn(II), oxovandium(IV) and dioxouranium(VI) with 2,4-dihydroxybenzaldehyde (2,4-DB)-urea(U)-formaldehyde(F) polymer (2,4-DBUF) have been prepared. Elemental analyses of the polychelates indicate a metal:ligand ratio of 1:2. The structures of the polychelates have been assigned on the basis of their elemental analyses, IR, reflectance spectra, magnetic moment, thermal data and their electrical conductivity behaviour. (author). 1 tab., 18 refs

Ni (II) and Cu(II) complexes of

African Journals Online (AJOL)

ADOWIE PERE

ABSTRACT: The objective of this study is to investigate the antimicrobial activity of novel. Schiff base metal complexes. The resistance of micro-organisms to classical antimicrobial compounds poses a challenge to effective management and treatment of some diseases. In line with this, copper (II), nickel (II) and cobalt (II) ...

Synthesis and characterization of chromium(III), manganese(II), iron(III), cobalt(II), nickel(II), copper(II), cadmium(II) and dioxouranium(VI) complexes of 4(2-pyridyl)-1-(2,4-dihydroxybenzaldehyde)-3-thiosemicarbazone

International Nuclear Information System (INIS)

Abu El-Reash, G.M.; Ibrahim, M.M.; Kenawy; El-Ayaan, Usama; Khattab, M.A.

1994-01-01

A few complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and dioxouranium(VI) with 4(2-pyridyl)-1-(2,4-dihydroxybenzaldehyde)-3-thiosemicarbazone have been synthesised and characterized on the basis of elemental analysis, IR, electronic NMR, and magnetic moment data. An octahedral structure is proposed for the Cr(III), Fe(III), Co(II) and Ni(H 3 PBT) 2 Cl 2 .2H 2 O complexes; a tetrahedral structure for the Mn(II) and Ni 2 (PBT)OAc.H 2 0 complexes and a square planar structure for the Cu(II) complexes. The antimicrobial and antifungal activities of H 3 PBT and of its metal(II) complexes are investigated. The results reveal that H 3 PBT exhibits greater antimicrobial activities than its complexes. (author). 34 refs., 4 figs., 2 tabs

Copper (II)

African Journals Online (AJOL)

CLEMENT O BEWAJI

Valine (2 - amino - 3 – methylbutanoic acid), is a chemical compound containing .... Stability constant (Kf). Gibb's free energy. ) (. 1. −. ∆. Mol. JG. [CuL2(H2O)2] ... synthesis and characterization of Co(ii), Ni(ii), Cu (II), and Zn(ii) complexes with ...

Synthesis and Spectral Investigations of Manganese(II, Cobalt(II, Nickel(II, Copper(II and Zinc(II Complexes of New Polydentate Ligands Containing a 1,8-Naphthyridine Moiety

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Sunkari Jyothi

2006-12-01

Full Text Available 2-(o-Hydroxyphenyl-1,8-naphthyridine (HN, 2-(4-hydroxy-6-methylpyran-2-one-3-yl-1,8-naphthyridine (HMPN and 2-(benzimidazol-2-yl-1,8-naphthyridine(BN react with acetates of Mn(II, Co(II, Ni(II, Cu(II and Zn(II to yield metal ioncomplexes of definite composition. These compounds were characterized by elementalanalyses, molar conductivity, magnetic susceptibility measurements, thermal studies, IR,UV-visible, NMR and mass spectral investigations. The complexes are found to have theformulae [M(HN2(H2O2], [M(HMPN2(H2O2] and [M(BN2(OAc2], respectively.

Coordination behavior of tetraaza [N4] ligand towards Co(II), Ni(II), Cu(II), Cu(I) and Pd(II) complexes: Synthesis, spectroscopic characterization and anticancer activity

Science.gov (United States)

El-Boraey, Hanaa A.

2012-11-01

Novel eight Co(II), Ni(II), Cu(II), Cu(I) and Pd(II) complexes with [N4] ligand (L) i.e. 2-amino-N-{2-[(2-aminobenzoyl)amino]ethyl}benzamide have been synthesized and structurally characterized by elemental analysis, spectral, thermal (TG/DTG), magnetic, and molar conductivity measurements. On the basis of IR, mass, electronic and EPR spectral studies an octahedral geometry has been proposed for Co(II), Ni(II) complexes and Cu(II) chloride complex, square-pyramidal for Cu(I) bromide complex. For Cu(II) nitrate complex (6), Pd(II) complex (8) square planar geometry was proposed. The EPR data of Cu(II) complexes in powdered form indicate dx2-y2 ground state of Cu(II) ion. The antitumor activity of the synthesized ligand and some selected metal complexes has been studied. The palladium(II) complex (8) was found to display cytotoxicity (IC50 = 25.6 and 41 μM) against human breast cancer cell line MCF-7 and human hepatocarcinoma HEPG2 cell line.

Spatial estimation of mean temperature and precipitation in areas of scarce meteorological information

Energy Technology Data Exchange (ETDEWEB)

Gomez, J.D. [Universidad Autonoma Chapingo, Chapingo (Mexico)]. E-mail: dgomez@correo.chapingo.mx; Etchevers, J.D. [Instituto de Recursos Naturales, Colegio de Postgraduados, Montecillo, Edo. de Mexico (Mexico); Monterroso, A.I. [departamento de Suelos, Universidad Autonoma Chapingo, Chapingo (Mexico); Gay, G. [Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico); Campo, J. [Instituto de Ecologia, Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico); Martinez, M. [Instituto de Recursos Naturales, Montecillo, Edo. de Mexico (Mexico)

2008-01-15

la estimacion de la temperatura y la precipitacion media anual y mensuales, tomando elementos de los metodos de interpolacion simple complementandolo con analisis estadisticos. Para la determinacion de la temperatura se generaron ecuaciones de regresion lineal simple relacionando la temperatura con la altura de las estaciones meteorologicas en la region de estudio, haciendo previamente una subdivision de la zona de acuerdo a las condiciones de humedad y aplicando dichas ecuaciones a los modelos de elevacion digital de la zona. La estimacion de la precipitacion se baso en las propuestas del metodo grafico a traves del analisis de los sistemas meteorologicos que afectan a cada una de las regiones de la zona de estudio a lo largo del ano y en el impacto que pueden tener las barreras montanosas en el movimiento del viento. En las estaciones meteorologicas con informacion de las zonas aledanas se analizaron los valores de precipitacion de acuerdo a su posicion en el paisaje, la exposicion a los vientos con humedad y el falso color que se asocia con los tipos y condicion de la vegetacion. Estos sitios fueron usados como referencia para asociar los valores de precipitacion con sitios semejantes sin informacion dentro del area de estudio y posteriormente se realizo la interpolacion usando analogias con las imagenes de falso color a las que se les superpuso un modelo de elevacion digital para trazar las isolineas con valores similares de precipitacion.

Removal of nickel(II and palladium(II from surface waters

Directory of Open Access Journals (Sweden)

V. Sharifzade

2013-04-01

Full Text Available A new sorbent was prepared using alumina and 5-Br-PADAP, and its adsorption ability for the removal of Ni(II and Pd(II from different waters was investigated. The procedure is based on retention of the analytes on the alumina load with 5-Br-PADAP at pH ~ 6. The separation/preconcentration conditions for the quantitative recoveries were investigated. The limit of detections (LOD based on three times the standard deviations of the blank, were 0.187 and 0.253 ng mL-1 for Ni(II and Pd(II, respectively. Obtained sorption capacities for 1 g sorbent were 6.0 mg Ni(II and 11.0 mg Pd(II. The linearity was maintained in the concentration range of 0.625 to 6.0 ng mL-1 for Ni(II and 0.416 to 7.0 ng mL-1 for Pd(II in the original solution. Eight replicate determinations of a mixture containing 2.0 µg mL-1 each of the elements in the final solution gave relative standard deviation of ±0.82 and ±1.12% for Ni(II and Pd(II, respectively. The proposed method was successfully applied to the determination trace amounts of Ni(II and Pd(II in the surface water samples.DOI: http://dx.doi.org/10.4314/bcse.v27i1.2

Evaluation of the computerized procedures Manual II (COPMA II)

International Nuclear Information System (INIS)

Converse, S.A.

1995-11-01

The purpose of this study was to evaluate the effects of a computerized procedure system, the Computerized Procedure Manual II (COPMA-II), on the performance and mental workload of licensed reactor operators. To evaluate COPMA-II, eight teams of two operators were trained to operate a scaled pressurized water reactor facility (SPWRF) with traditional paper procedures and with COPMA-II. Following training, each team operated the SPWRF under normal operating conditions with both paper procedures and COPMA-II. The teams then performed one of two accident scenarios with paper procedures, but performed the remaining accident scenario with COPMA-II. Performance measures and subjective estimates of mental workload were recorded for each performance trial. The most important finding of the study was that the operators committed only half as many errors during the accident scenarios with COPMA-II as they committed with paper procedures. However, time to initiate a procedure was fastest for paper procedures for accident scenario trials. For performance under normal operating conditions, there was no difference in time to initiate or to complete a procedure, or in the number of errors committed with paper procedures and with COPMA-II. There were no consistent differences in the mental workload ratings operators recorded for trials with paper procedures and COPMA-II

Efficiency of Chitosan for the Removal of Pb (II, Fe (II and Cu (II Ions from Aqueous Solutions

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Soheil Sobhanardakani

2014-09-01

Full Text Available Background: Heavy metals have been recognized as harmful environmental pollutant known to produce highly toxic effects on different organs and systems of both humans and animals. The aim of this paper is to evaluate the adsorption potential of chitosan for the removal of Pb(II, Fe(II and Cu(II ions from aqueous solutions. Methods: This study was conducted in laboratory scale. In this paper chitosan has been used as an adsorbent for the removal of Pb(II, Fe(II and Cu(II from aqueous solution. In batch tests, the effects of parameters like pH solution (1.0-8.0, initial metal concentrations (100-1000 mgL-1, contact time (5.0-150 min and adsorbent dose (1.0-7.0 g on the adsorption process were studied. Results: The results showed that the adsorption of Pb(II, Fe(II and Cu(II ions on chitosan strongly depends on pH. The experimental isothermal data were analyzed using the Langmuir and Freundlich equations and it was found that the removal process followed the Langmuir isotherm and maximum adsorption capacity for the adsorption of Pb(II, Fe(II and Cu(II ions by the chitosan were 55.5mg g−1, 71.4 mg g−1 and 59 mg g−1, respectively, under equilibrium conditions at 25±1 ºC. The adsorption process was found to be well described by the pseudo-second-order rate model. Conclusion: The obtained results showed that chitosan is a readily, available, economic adsorbent and was found suitable for removing Pb(II, Fe(II and Cu(II ions from aqueous solution.

Spectrophotometric determination of cobalt(II), nickel(II) and copper (II) with 1-(2 pyridylazo)-2-naphthol in micellar medium

International Nuclear Information System (INIS)

Shar, G.A.; Soomro, G.A.

2004-01-01

Spectrophotometric determination of cobalt(II), nickel(II) and copper(II) is carried out with 1-(2 pyridylazo)-2-naphthol as a complexing reagent in aqueous phase using non-ionic surfactant Tween 80. Beer's law is obeyed for Co(II), Ni(II) and Cu(II) over the range 0.5 - 4.0, 0.5 - 4.0 and 0.5 - 3.0 ngmL/sup -1/ with detection limit (2 σ) of 6.7, 3.2 and 3.9 ngmL/sup -1/. The max molar absorption, molar absorptivity, Sandell's sensitivity of Co(II), Ni(II) and Cu(II) are 580 nm, 570 nm and 555 nm; max (104 mol/sup -1/ cm /sup -1/) is 0.87, 1.8 and 1.6 and 6.8, 3.3 and 3.9 ng cm-2 respectively. The pH at which complex is formed for Co(II), Ni(II) and Cu(II) is 5, 5.5 and 6.5 respectively. The critical micelle concentration (CMC) of Tween 80 is 5%. The present method is compared with that of atomic absorption spectroscopy and no significant difference is noted between the two methods at 95% confidence level. The method has been applied to the determination of Co(II), Ni(II) and Cu(II) in industrial waste water and pharmaceutical samples. (author)

Synthesis, spectral characterization thermal stability, antimicrobial studies and biodegradation of starch–thiourea based biodegradable polymeric ligand and its coordination complexes with [Mn(II, Co(II, Ni(II, Cu(II, and Zn(II] metals

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Nahid Nishat

2016-09-01

Full Text Available A biodegradable polymer was synthesized by the modification reaction of polymeric starch with thiourea which is further modified by transition metals, Mn(II, Co(II, Ni(II, Cu(II and Zn(II. All the polymeric compounds were characterized by (FT-IR spectroscopy, 1H NMR spectroscopy, 13C NMR spectroscopy, UV–visible spectra, magnetic moment measurements, thermogravimetric analysis (TGA and antibacterial activities. Polymer complexes of Mn(II, Co(II and Ni(II show octahedral geometry, while polymer complexes of Cu(II and Zn(II show square planar and tetrahedral geometry, respectively. The TGA revealed that all the polymer metal complexes are more thermally stable than their parental ligand. In addition, biodegradable studies of all the polymeric compounds were also carried out through ASTM-D-5338-93 standards of biodegradable polymers by CO2 evolution method which says that coordination decreases biodegradability. The antibacterial activity was screened with the agar well diffusion method against some selected microorganisms. Among all the complexes, the antibacterial activity of the Cu(II polymer–metal complex showed the highest zone of inhibition because of its higher stability constant.

Removal of Ni (II), Co (II) and Pb (II) ions from aqueous media using ...

African Journals Online (AJOL)

Removal of Ni (II), Co (II) and Pb (II) ions from aqueous media using Starch ... The results showed that 0.025 % loaded SSMNPs gave the optimal sorption ... constants (Lagergren and Pseudo-2nd-order) for Ni2+ and Co2+ adsorption were ... Langmuir correlation coefficients showed a better fit for the adsorption isotherms.

Selective Hg(II) adsorption from aqueous solutions of Hg(II) and Pb(II) by hydrolyzed acrylamide-grafted PET films.

Science.gov (United States)

Rahman, Nazia; Sato, Nobuhiro; Sugiyama, Masaaki; Hidaka, Yoshiki; Okabe, Hirotaka; Hara, Kazuhiro

2014-01-01

Selective Hg(II) adsorption from aqueous solutions of Hg(II) and Pb(II) using hydrolyzed acrylamide (AAm)-grafted polyethylene terephthalate (PET) films was examined to explore the potential reuse of waste PET materials. Selective recovery of Hg(II) from a mixture of soft acids with similar structure, such as Hg(II) and Pb(II), is important to allow the reuse of recovered Hg(II). An adsorbent for selective Hg(II) adsorption was prepared by γ-ray-induced grafting of AAm onto PET films followed by partial hydrolysis through KOH treatment. The adsorption capacity of the AAm-grafted PET films for Hg(II) ions increased from 15 to 70 mg/g after partial hydrolysis because of the reduction of hydrogen bonding between -CONH2 groups and the corresponding improved access of metal ions to the amide groups. The prepared adsorbent was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The absorbent film showed high selectivity for the adsorption of Hg(II) over Pb(II) throughout the entire initial metal concentration range (100-500 mg/L) and pH range (2.2-5.6) studied. The high selectivity is attributed to the ability of Hg(II) ions to form covalent bonds with the amide groups. The calculated selectivity coefficient for the adsorbent binding Hg(II) over Pb(II) was 19.2 at pH 4.5 with an initial metal concentration of 100 mg/L. Selective Hg(II) adsorption equilibrium data followed the Langmuir model and kinetic data were well fitted by a pseudo-second-order equation. The adsorbed Hg(II) and Pb(II) ions were effectively desorbed from the adsorbent film by acid treatment, and the regenerated film showed no marked loss of adsorption capacity upon reuse for selective Hg(II) adsorption.

Dynamic PMU Compliance Test under C37.118.1aTM-2014

DEFF Research Database (Denmark)

Ghiga, Radu; Wu, Qiuwei; Martin, K.

2015-01-01

This paper presents a flexible testing methodology and the dynamic compliance of PMUs as per the new C37.118.1a amendment published in 2014. The test platform consists of test signal generator, a Doble F6150 amplifier, PMUs under test, and a PMU test result analysis kit. The Doble amplifier is used...

Resultados a corto-medio plazo en revascularización miocárdica aislada con injerto de arteria mamaria interna bilateral en 497 pacientes

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Carlos-Esteban Martín López

2016-01-01

Conclusiones: La cirugía de revascularización miocárdica con doble mamaria presenta unos excelentes resultados a corto y medio plazo independientemente de la edad. En pacientes con elevada comorbilidad, especialmente vasculopatía e insuficiencia renal, se debería individualizar la decisión del uso de doble mamaria.

New Mn(II, Ni(II, Cd(II, Pb(II complexes with 2-methylbenzimidazole and other ligands. Synthesis, spectroscopic characterization, crystal structure, magnetic susceptibility and biological activity studies

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Shayma A. Shaker

2016-11-01

Full Text Available Synthesis and characterization of Mn(II, Ni(II, Cd(II and Pb(II mixed ligand complexes of 2-methylbenzimidazole with other ligands have been reported. The structure of the ligands and their complexes was investigated using elemental analysis, IR, UV–Vis, (1H, 13C NMR spectroscopy, molar conductivity and magnetic susceptibility measurements. In all the studies of complexes, the 2-methylbenzimidazole behaves as a neutral monodentate ligand which is coordinated with the metal ions through the N atom. While benzotriazole behaves as a neutral bidentate ligand which is coordinated with the Ni(II ion through the two N atoms. Moreover, the N-acetylglycine behaves as a bidentate ligand which is coordinated with the Mn(II, Ni(II and Pb(II ions through the N atom and the terminal carboxyl oxygen atom. The magnetic and spectral data indicate the tetrahedral geometry for Mn(II complex, irregular tetrahedral geometry for Pb(II complex and octahedral geometry for Ni(II complex. The X-ray single crystal diffraction method was used to confirm a centrosymmetric dinuclear Cd(II complex as each two metal ions are linked by a pair of thiocyanate N = S bridge. Two 2-methylbenzimidazole N-atom donors and one terminal thiocyanate N atom complete a highly distorted square pyramid geometry around the Cd atom. Besides, different cell types were used to determine the inhibitory effect of Mn(II, Ni(II, Cd(II and Pb(II complexes on cell growth using MTT assay. Cd(II complex showed cytotoxic effect on various types of cancer cell lines with different EC50 values.

Chelation of Cu(II, Zn(II, and Fe(II by Tannin Constituents of Selected Edible Nuts

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Magdalena Karamać

2009-12-01

Full Text Available The tannin fractions isolated from hazelnuts, walnuts and almonds were characterised by colorimetric assays and by an SE-HPLC technique. The complexation of Cu(II and Zn(II was determined by the reaction with tetramethylmurexide, whereas for Fe(II, ferrozine was employed. The walnut tannins exhibited a significantly weaker reaction with the vanillin/HCl reagent than hazelnut and almond tannins, but the protein precipitation capacity of the walnut fraction was high. The SE-HPLC chromatogram of the tannin fraction from hazelnuts revealed the presence of oligomers with higher molecular weights compared to that of almonds. Copper ions were most effectively chelated by the constituents of the tannin fractions of hazelnuts, walnuts and almonds. At a 0.2 mg/assay addition level, the walnut tannins complexed almost 100% Cu(II. The Fe(II complexation capacities of the tannin fractions of walnuts and hazelnuts were weaker in comparison to that of the almond tannin fraction, which at a 2.5 mg/assay addition level, bound Fe(II by ~90%. The capacity to chelate Zn(II was quite varied for the different nut tannin fractions: almond tannins bound as much as 84% Zn(II, whereas the value for walnut tannins was only 8.7%; and for hazelnut tannins, no Zn(II chelation took place at the levels tested.

Stability constants of glutarate complexes of copper(II), zinc(II), cobalt(II) and uranyl(II) by paper electrophoresis

International Nuclear Information System (INIS)

Singh, R.K.P.; Yadava, J.R.; Yadava, K.L.

1981-01-01

Stability constants of Copper(II), Zinc(II), Cobalt(II) and Uranyl(II) glutarates have been determined by paper electrophoresis. Glutaric acid (0.005 mol dmsup(-3)) was added to the background electrolyte : 0.1 mol dmsup(-3) HClO 4 . The proportions of (CH 2 ) 3 COOH COO - and (CH 2 ) 3 C 2 O 4 2- were varied by changing the pH of the electrolyte. These anions yielded the complexes Cu(CH 2 ) 3 C 2 O 4 , [Zn(CH 2 ) 3 COOH COO] + [Co(CH 2 ) 3 COOH COO] + and UO 2 (CH 2 ) 3 C 2 O 4 whose stability constants are found to be 10sup(3.9), 10sup(2.9), 10sup(2.7) and 10sup(13.5) respectively. (author)

Pb(II), Cd(II) and Zn(II) adsorption on low grade manganese ore ...

African Journals Online (AJOL)

Low grade manganese ore (LMO) of Orissa containing 58.37% SiO2, 25.05% MnO2, 8.8% Al2O3, and 5.03% Fe2O3 as the main constituents was taken to study its adsorption behaviour for Pb(II), Cd(II) and Zn(II) from aqueous solutions. The XRD studies showed the crystalline phases to be quartz, ß-MnO2, d-MnO2 and ...

Crystal Structure of Rat Carnitine Palmitoyltransferase II (CPT-II)

Energy Technology Data Exchange (ETDEWEB)

Hsiao,Y.; Jogl, G.; Esser, V.; Tong, L.

2006-01-01

Carnitine palmitoyltransferase II (CPT-II) has a crucial role in the {beta}-oxidation of long-chain fatty acids in mitochondria. We report here the crystal structure of rat CPT-II at 1.9 Angstroms resolution. The overall structure shares strong similarity to those of short- and medium-chain carnitine acyltransferases, although detailed structural differences in the active site region have a significant impact on the substrate selectivity of CPT-II. Three aliphatic chains, possibly from a detergent that is used for the crystallization, were found in the structure. Two of them are located in the carnitine and CoA binding sites, respectively. The third aliphatic chain may mimic the long-chain acyl group in the substrate of CPT-II. The binding site for this aliphatic chain does not exist in the short- and medium-chain carnitine acyltransferases, due to conformational differences among the enzymes. A unique insert in CPT-II is positioned on the surface of the enzyme, with a highly hydrophobic surface. It is likely that this surface patch mediates the association of CPT-II with the inner membrane of the mitochondria.

Multi-metals column adsorption of lead(II), cadmium(II) and manganese(II) onto natural bentonite clay.

Science.gov (United States)

Alexander, Jock Asanja; Surajudeen, Abdulsalam; Aliyu, El-Nafaty Usman; Omeiza, Aroke Umar; Zaini, Muhammad Abbas Ahmad

2017-10-01

The present work was aimed at evaluating the multi-metals column adsorption of lead(II), cadmium(II) and manganese(II) ions onto natural bentonite. The bentonite clay adsorbent was characterized for physical and chemical properties using X-ray diffraction, X-ray fluorescence, Brunauer-Emmett-Teller surface area and cation exchange capacity. The column performance was evaluated using adsorbent bed height of 5.0 cm, with varying influent concentrations (10 mg/L and 50 mg/L) and flow rates (1.4 mL/min and 2.4 mL/min). The result shows that the breakthrough time for all metal ions ranged from 50 to 480 minutes. The maximum adsorption capacity was obtained at initial concentration of 10 mg/L and flow rate of 1.4 mL/min, with 2.22 mg/g of lead(II), 1.71 mg/g of cadmium(II) and 0.37 mg/g of manganese(II). The order of metal ions removal by natural bentonite is lead(II) > cadmium(II) > manganese(II). The sorption performance and the dynamic behaviour of the column were predicted using Adams-Bohart, Thomas, and Yoon-Nelson models. The linear regression analysis demonstrated that the Thomas and Yoon-Nelson models fitted well with the column adsorption data for all metal ions. The natural bentonite was effective for the treatment of wastewater laden with multi-metals, and the process parameters obtained from this work can be used at the industrial scale.

Antibacterial Co(II, Ni(II, Cu(II and Zn(II complexes with biacetyl-derived Schiff bases

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MUHAMMAD IMRAN

2010-08-01

Full Text Available The condensation reactions of biacetyl with ortho-hydroxyaniline and 2-aminobenzoic acid to form bidendate NO donor Schiff bases were studied. The prepared Schiff base ligands were further utilized for the formation of metal chelates having the general formula [ML2(H2O2] where M = Co(II, Ni(II, Cu(II and Zn(II and L = HL1 and HL2. These new compounds were characterized by conductance measurements, magnetic susceptibility measurements, elemental analysis, and IR, 1H-NMR, 13C-NMR and electronic spectroscopy. Both Schiff base ligands were found to have a mono-anionic bidentate nature and octahedral geometry was assigned to all metal complexes. All the complexes contained coordinated water which was lost at 141–160 °C. These compounds were also screened for their in vitro antibacterial activity against four bacterial species, namely: Escherichia coli, Staphylococcus aureus, Salmonella typhi and Bacillus subtilis. The metal complexes were found to have greater antibacterial activity than the uncomplexed Schiff base ligands.

SEPARATION OF Fe (III, Cr(III, Cu(II, Ni(II, Co(II, AND Pb(II METAL IONS USING POLY(EUGENYL OXYACETIC ACID AS AN ION CARRIER BY A LIQUID MEMBRANE TRANSPORT METHOD

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La Harimu

2010-06-01

Full Text Available Fe (III, Cr(III, Cu(II, Ni(II, Co(II, and Pb(II  metal ions had been separated using poly(eugenyl oxyacetic acid as an ion carrier by bulk liquid membrane transport method. The effect of pH, polyeugenyl oxyacetic acid ion carrier concentration, nitric acid concentration in the stripping solution, transport time, and metal concentration were optimized. The result showed that the optimum condition for transport of metal ions was at pH 4 for ion Fe(III and at pH 5 for Cr(III, Cu(II, Ni(II, Co(II, and Pb(II ions. The carrier volumes were optimum with concentration of 1 x 10-3 M at 7.5 mL for Cr(III, Cu (II,  Ni(II, Co(II ions and at 8.5 mL for Fe(III and Pb(II ions. The concentration of HNO3 in stripping phase was optimum at 2 M for Fe(III and Cu(II ions, 1 M for Cr(III, Ni(II and Co(II ions, and 0.5 M for Pb(II ion. The optimum transport times were 36 h for Fe(III and Co(II ions, and 48 h for Cr(III, Cu (II, Ni(II, and Pb(II ions. The concentration of metal ions accurately transported were 2.5 x 10-4 M for Fe(III and Cr(III ions, and 1 M for Cu (II, Ni(II, Co(II, and Pb(II ions. Compared to other metal ions the transport of Fe(III was the highest with selectivity order of Fe(III > Cr(III > Pb(II > Cu(II > Ni(II > Co(II. At optimum condition, Fe(III ion was transported through the membrane at 46.46%.   Keywords: poly(eugenyl oxyacetic acid, transport, liquid membrane, Fe (III, Cr(III, Cu(II, Ni(II, Co(II, and Pb(II ions

Synthesis and Characterization of Multimetallic Fe(II) and Mn(II ...

African Journals Online (AJOL)

Iron(II) and Manganese(II) complexes of the resulting ligand were obtained from its reactions with Fe(II) and Mn(II) salts in absolute methanol for the metal to ligand ratio 2:3. These complexes were characterized by Solubility, Conductivity, IR and UV-VIS spectrometry, elemental analysis and mass spectrometry. Keywords: ...

(II) complexes

African Journals Online (AJOL)

activities of Schiff base tin (II) complexes. Neelofar1 ... Conclusion: All synthesized Schiff bases and their Tin (II) complexes showed high antimicrobial and ...... Singh HL. Synthesis and characterization of tin (II) complexes of fluorinated Schiff bases derived from amino acids. Spectrochim Acta Part A: Molec Biomolec.

Internacionalización de la educación superior en Costa Rica La experiencia de una maestría de doble titulación de la Universidad Nacional

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Arlette Pichardo Muñiz

2016-06-01

Full Text Available Costa Rica ha propiciado la movilidad internacional estudiantil y docente desde hace varias décadas, incluso como sede de programas internacionales de educación superior. El Centro Internacional de Política Económica para el Desarrollo Sostenible (CINPE de la Universidad Nacional (UNA en la actualidad imparte la Maestría en Gerencia del Comercio Internacional (MGCI, en doble titulación con el Instituto Tecnológico de Santo Domingo (INTEC, República Dominicana. Esta es la primera de su género en el país –según se conoce hasta la fecha– y, quizás, en Centroamérica, donde una universidad costarricense aporta el currículo y asume el liderazgo académico, incorporando la transculturalidad como valor agregado. El objetivo del artículo es difundir lecciones de esta experiencia que puedan ser útiles para otras iniciativas. En términos generales, los resultados de la sistematización indican que: (1 la inclusión de las dimensiones internacional e intercultural supone, primero, la internacionalización en casa; (2 la creación de condiciones iniciales para escalar peldaños superiores en el proceso de internacionalización, no ocurre de la noche a la mañana; (3 la gestión y gerencia suponen soluciones innovadoras y consensuadas; y (4 hace falta poner la debida atención en la armonización de procedimientos, instrumentos y formularios. Sobre la base de los principales hallazgos se presentan algunas conclusiones, en particular para la discusión de las implicaciones de un programa de esta naturaleza u otros con características similares.

Fe (III), Co(II), Ni(II), Cu(II) and Zn(II) complexes of schiff bases based-on glycine and phenylalanine: Synthesis, magnetic/thermal properties and antimicrobial activity

Science.gov (United States)

Sevgi, Fatih; Bagkesici, Ugur; Kursunlu, Ahmed Nuri; Guler, Ersin

2018-02-01

Zinc (II), copper (II), nickel (II), cobalt (II) and iron (III) complexes of Schiff bases (LG, LP) derived from 2-hydroxynaphthaldehyde with glycine and phenylalanine were reported and characterized by 1H NMR, 13C NMR, elemental analyses, melting point, FT-IR, magnetic susceptibility and thermal analyses (TGA). TGA data show that iron and cobalt include to the coordinated water and metal:ligand ratio is 1:2 while the complex stoichiometry for Ni (II), Cu (II) and Zn (II) complexes is 1:1. As expected, Ni (II) and Zn (II) complexes are diamagnetic; Cu (II), Co (II) and Fe (III) complexes are paramagnetic character due to a strong ligand of LG and LP. The LG, LP and their metal complexes were screened for their antimicrobial activities against five Gram-positive (Staphylococcus aureus, Methicillin resistant Staphylococcus aureus (MRSA), Bacillus cereus, Streptococcus mutans and Enterococcus faecalis) and three Gram-negative (Escherichia coli, Klebsiella pneumoniae and Pseudomonas aeruginosa) and one fungi (Candida albicans) by using broth microdilution techniques. The activity data show that ligands and their metal complexes exhibited moderate to good activity against Gram-positive bacteria and fungi.

DNA damage by the cobalt (II) and zinc (II) complexes of ...

African Journals Online (AJOL)

Using the single cell gel electrophoresis method, the tetraazamacrocycle Zn(II) complex (Zn(II)-L) and the tetraazamacrocycle Co(II) complex (Co(II)-L) were investigated focusing on their DNA damage to Tetrahymena thermophila. When the cells were treated with the 0.05, 0.25 and 0.50 mg/ml Zn(II)-L, the tail length ...

Syntheses and spectroscopic properties of mercury(II) and nickel(II ...

African Journals Online (AJOL)

Mercury(II) complex, [Hg2(BPTU-2H)Cl2] and nickel(II) complex, [Ni(BPTU-H)2] were prepared by reacting Bis(N-phenylthiourea), BPTU, with mercury(II) chloride and nickel(II) acetate respectively. The complexes were characterized by IR, diffuse reflectance, 1H NMR spectra and elemental analysis. BPTU acts as ...

Estudo do estresse do enfermeiro com dupla jornada de trabalho em um hospital de oncologia pediátrica de Campinas Estudio del estrés del enfermero con doble jornada de trabajo en un hospital de oncologia pediátrica de Campinas Study on the stress over the nurse who works in two shifts at a pediatric oncology hospital in Campinas

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Roberta Cova Pafaro

2004-06-01

Full Text Available Trata-se de um estudo que teve como objetivo investigar a presença e o nível de estresse emocional, os sintomas físicos e psicológicos, a intensidade do estresse e enfermeiros que fazem dupla jornada de trabalho comparados aos que não fazem, num hospital de oncologia pediátrica de Campinas. A população foi composta por 33 enfermeiros, sendo 24 em regime de dupla jornada e 9 em jornada única. Na metodologia foi utilizado o Inventario de Sintoma de Stress LIPP e a Escala Analógica Visual. Os resultados permitiram constatar que os enfermeiros classificados quanto as fases de estresse encontravam-se na fase de resistência, com referencia aos níveis de estresse os mesmos encontravam-se no nível médio de estresse, houve predominância dos sintomas psicológicos e os enfermeiros com dupla jornada estavam mais estressados em relação aos com jornada única.Se trata de un estudio que tuvo como objetivo investigar presencia y nivel de estrés emocional, síntomas físicos y psicológicos, intensidad del estrés y enfermeros que realizan doble jornada de trabajo comparados a los que no lo hacen, en un hospital de oncología pediátrica de Campinas. La población estuvo compuesta por 33 enfermeros, de los cuales 24 en régimen de doble jornada y 9 en jornada única. En la metodología fue utilizado el Inventario de Síntoma de Stress LIPP y la Escala Analógica Visual. Los resultados permitieron constatar que los enfermeros clasificados, en relación a las fases de estrés, se encontraban en la fase de resistencia; con referencia a los niveles de estrés los mismos se encontraban en el nivel medio de estrés; hubo predominio de los síntomas psicológicos y los enfermeros con doble jornada estaban más estresados que los de jornada única.This is a study that aimed investigating the presence and level of emotional stress, the physical and psychological symptoms, the intensity of stress and nurses who have two work shifts compared to the ones

Solar Type II Radio Bursts and IP Type II Events

Science.gov (United States)

Cane, H. V.; Erickson, W. C.

2005-01-01

We have examined radio data from the WAVES experiment on the Wind spacecraft in conjunction with ground-based data in order to investigate the relationship between the shocks responsible for metric type II radio bursts and the shocks in front of coronal mass ejections (CMEs). The bow shocks of fast, large CMEs are strong interplanetary (IP) shocks, and the associated radio emissions often consist of single broad bands starting below approx. 4 MHz; such emissions were previously called IP type II events. In contrast, metric type II bursts are usually narrowbanded and display two harmonically related bands. In addition to displaying complete dynamic spectra for a number of events, we also analyze the 135 WAVES 1 - 14 MHz slow-drift time periods in 2001-2003. We find that most of the periods contain multiple phenomena, which we divide into three groups: metric type II extensions, IP type II events, and blobs and bands. About half of the WAVES listings include probable extensions of metric type II radio bursts, but in more than half of these events, there were also other slow-drift features. In the 3 yr study period, there were 31 IP type II events; these were associated with the very fastest CMEs. The most common form of activity in the WAVES events, blobs and bands in the frequency range between 1 and 8 MHz, fall below an envelope consistent with the early signatures of an IP type II event. However, most of this activity lasts only a few tens of minutes, whereas IP type II events last for many hours. In this study we find many examples in the radio data of two shock-like phenomena with different characteristics that occur simultaneously in the metric and decametric/hectometric bands, and no clear example of a metric type II burst that extends continuously down in frequency to become an IP type II event. The simplest interpretation is that metric type II bursts, unlike IP type II events, are not caused by shocks driven in front of CMEs.

Synthesis and characterization of iron(III), manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) complexes of salicylidene-N-anilinoacetohydrazone (H2L1) and 2-hydroxy-1-naphthylidene-N-anilinoacetohydrazone (H2L2).

Science.gov (United States)

AbouEl-Enein, S A; El-Saied, F A; Kasher, T I; El-Wardany, A H

2007-07-01

Salicylidene-N-anilinoacetohydrazone (H(2)L(1)) and 2-hydroxy-1-naphthylidene-N-anilinoacetohydrazone (H(2)L(2)) and their iron(III), manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II) complexes have been synthesized and characterized by IR, electronic spectra, molar conductivities, magnetic susceptibilities and ESR. Mononuclear complexes are formed with molar ratios of 1:1, 1:2 and 1:3 (M:L). The IR studies reveal various modes of chelation. The electronic absorption spectra and magnetic susceptibility measurements show that the iron(III), nickel(II) and cobalt(II) complexes of H(2)L(1) have octahedral geometry. While the cobalt(II) complexes of H(2)L(2) were separated as tetrahedral structure. The copper(II) complexes have square planar stereochemistry. The ESR parameters of the copper(II) complexes at room temperature were calculated. The g values for copper(II) complexes proved that the Cu-O and Cu-N bonds are of high covalency.

Pecan nutshell as biosorbent to remove Cu(II), Mn(II) and Pb(II) from aqueous solutions.

Science.gov (United States)

Vaghetti, Julio C P; Lima, Eder C; Royer, Betina; da Cunha, Bruna M; Cardoso, Natali F; Brasil, Jorge L; Dias, Silvio L P

2009-02-15

In the present study we reported for the first time the feasibility of pecan nutshell (PNS, Carya illinoensis) as an alternative biosorbent to remove Cu(II), Mn(II) and Pb(II) metallic ions from aqueous solutions. The ability of PNS to remove the metallic ions was investigated by using batch biosorption procedure. The effects such as, pH, biosorbent dosage on the adsorption capacities of PNS were studied. Four kinetic models were tested, being the adsorption kinetics better fitted to fractionary-order kinetic model. Besides that, the kinetic data were also fitted to intra-particle diffusion model, presenting three linear regions, indicating that the kinetics of adsorption should follow multiple sorption rates. The equilibrium data were fitted to Langmuir, Freundlich, Sips and Redlich-Peterson isotherm models. Taking into account a statistical error function, the data were best fitted to Sips isotherm model. The maximum biosorption capacities of PNS were 1.35, 1.78 and 0.946mmolg(-1) for Cu(II), Mn(II) and Pb(II), respectively.

Physico - chemical investigation on Co(II), Ni(II), Cu(II), Zn(II), Cd(II), UO2+2 and VO+2 ions-O-(-N-3,5-dichloro-α-pyridone imino)

International Nuclear Information System (INIS)

Mathur, Praveen; Trivedi, Pradeep; Mehta, R.K.

1983-01-01

Studies on the interaction of newly synthesised ligand, O-(N-3, 5-dichloro-α-pyridone imino) benzene sulphonic acid (H 2 PB) with Co(II), Ni(II), Cu(II), Zn(II), Cd(II), UO 2 +2 and VO +2 have been carried out potentiometrically. Many physico-chemical studies on thermodynamics, elemental analysis, molecular weight, magnetic moment, conductance, electronic and IR spectra have also been made on the solid chelates and their adducts. The dissociation constants of H 2 PB and stabilities of its bivalent chelates have been evaluated potentiometrically at 25deg, 35deg and 45degC in aqueous medium (0.01M, 0.05M and 0.1M NaClO 4 ) by Bjerrum's method. The stability sequence is in agreement with the Irving-William's rule. (author)

Unsaturated b-ketoesters and their Ni(II, Cu(II and Zn(II complexes

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MUHAMMED BASHEER UMMATHUR

2009-03-01

Full Text Available A new series of b-ketoesters in which the keto group is attached to the olefinic linkage were synthesized by the reaction of methyl acetoacetate and aromatic aldehydes under specified conditions. The existence of these compounds predominantly in the intramolecularly hydrogen bonded enol form was well demonstrated from their IR, 1H-NMR and mass spectral data. Details on the formation of their [ML2] complexes with Ni(II, Cu(II and Zn(II and the nature of the bonding are discussed on the basis of analytical and spectral data.

Synthesis, spectral, thermal and antimicrobial studies on cobalt(II), nickel(II), copper(II), zinc(II) and palladium(II) complexes containing thiosemicarbazone ligand

Science.gov (United States)

El-Sawaf, Ayman K.; El-Essawy, Farag; Nassar, Amal A.; El-Samanody, El-Sayed A.

2018-04-01

The coordination characteristic of new N4-morpholinyl isatin-3-thiosemicarbazone (HL) towards Co(II), Ni(II), Cu(II), Zn(II) and Pd(II) has been studies. The structures of the complexes were described by elemental analyses, molar conductivity, magnetic, thermal and spectral (IR, UV-Vis, 1H and 13C NMR and ESR) studies. On the basis of analytical and spectral studies the ligand behaves as monobasic tridentate ONS donor forming two five membered rings towards cobalt, copper and palladium and afforded complexes of the kind [M(L)X], (Mdbnd Co, Cu or Pd; Xdbnd Cl, Br or OAc). Whereas the ligand bound to NiCl2 as neutral tridentate ONS donor and with ZnCl2 as neutral bidentate NS donor. The newly synthesized thiosemicarbazone ligand and some of its complexes were examined for antimicrobial activity against 2 gram negative bacterial strains (Escherichia coli Pseudomonas and aeruginosa), 2 gram positive bacterial strains (Streptococcus pneumoniae and Staphylococcus aureus)} and two Pathogenic fungi (Aspergillus fumigatus and Candida albicans). All metal complexes possess higher antimicrobial activity comparing with the free thiosemicarbazone ligand. The high potent activities of the complexes may arise from the coordination and chelation, which tends to make metal complexes act as more controlling and potent antimicrobial agents, thus hindering the growing of the microorganisms. The antimicrobial results also show that copper bromide complex is better antimicrobial agent as compared to the Schiff base and its metal complexes.

Equilibrium and kinetic studies of Pb(II, Cd(II and Zn(II sorption by Lagenaria vulgaris shell

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Mitić-Stojanović Dragana-Linda

2012-01-01

Full Text Available The sorption of lead, cadmium and zinc ions from aqueous solution by Lagenaria vulgaris shell biosorbent (LVB in batch system was investigated. The effect of relevant parameters such as contact time, biosorbent dosage and initial metal ions concentration was evaluated. The Pb(II, Cd(II and Zn(II sorption equilibrium (when 98% of initial metal ions were sorbed was attained within 15, 20 and 25 min, respectively. The pseudo first, pseudo-second order, Chrastil’s and intra-particle diffusion models were used to describe the kinetic data. The experimental data fitted the pseudo-second order kinetic model and intra-particle diffusion model. Removal efficiency of lead(II, cadmium(II and zinc(II ions rapidly increased with increasing biosorbent dose from 0.5 to 8.0 g dm-3. Optimal biosorbent dose was set to 4.0 g dm-3. An increase in the initial metal concentration increases the sorption capacity. The sorption data of investigated metal ions are fitted to Langmuir, Freundlich and Temkin isotherm models. Langmuir model best fitted the equilibrium data (r2 > 0.99. Maximal sorption capacities of LVB for Pb(II, Cd(II and Zn(II at 25.0±0.5°C were 0.130, 0.103 and 0.098 mM g-1, respectively. The desorption experiments showed that the LVB could be reused for six cycles with a minimum loss of the initial sorption capacity.

Recovery of Cd(II), Co(II) and Ni(II) from Chloride Medium by Solvent Extraction Using CYANEX 923 and CYANEX 272 I

International Nuclear Information System (INIS)

Ahmed, M.; El Dessouky, S.I.; El-Nadi, Y.A.; Daoud, J.A.; Saad, E.A.

2008-01-01

The paper aims to study the extraction and separation of Cd(II), Co(II) and Ni(II) from their mixtures in hydrochloric acid medium with CYANEX 923 in kerosene. Preliminary investigations showed that only Cd(II) is extracted with CYANEX 923 while Co(II) and Ni(II) are not extracted. Different parameters affecting the extraction of Cd(II) with CYANEX 923 such as hydrochloric acid, hydrogen ion, extractant and metal concentrations, temperature investigations were also investigated. The stoichiometry of the extracted metal species investigated was found to be HCdCl 3 . 2 CYANEX 923. The stripping of the extracted Cd(II) species is obtained with 0.1 M HCl solution. Co(II) was found to be extracted with CYANEX 272 at ph 5.8 leaving Ni(II) in the solution. A developed process for the sequential of Cd(II), Co(II) and Ni(II) from their mixture in hydrochloric acid medium is proposed

The type II collagen fragments Helix-II and CTX-II reveal different enzymatic pathways of human cartilage collagen degradation

DEFF Research Database (Denmark)

Charni-Ben Tabassi, N; Desmarais, S; Jensen, Anne-Christine Bay

2008-01-01

human recombinant cathepsins (Cats) and matrix-metalloproteases (MMPs). Next, we analyzed the spontaneous release of Helix-II and CTX-II from cartilage sections of patients with knee OA who were immediately deep frozen after joint replacement to preserve endogenous enzyme activity until assay. Cartilage....... Cat D was unable to digest intact cartilage. MMPs-1, -3, -7, -9, and -13 efficiently released CTX-II, but only small amount of Helix-II. Neither CTX-II nor Helix-II alone was able to reflect accurately the collagenolytic activity of Cats and MMPs as reflected by the release of hydroxyproline. In OA...

Thermal, spectral, magnetic and biological studies of thiosemicarbazones complexes with metal ions: Cu(II), Co(II), Ni(II), Fe(III), Zn(II), Mn(II) and UO2(VI)

International Nuclear Information System (INIS)

Mashaly, M.M.; Seleem, H.S.; El-Behairy, M.A.; Habib, H.A.

2004-01-01

Thiosemicarbazones ligands, isatin-3-thiosemicarbazone(HIT) and N-acetylisatin-3-thiosemicarbazone (HAIT), which have tridentate ONN coordinating sites were prepared. The complexes of both ligands with Cu(II), Co(II), Ni(II), Fe(III), Zn(II), Mn(II) and UO 2 (VI) ions were isolated. The ligands and their metal complexes were characterized by elemental analysis, IR, UV-Vis and mass spectra, also by conductance, magnetic moment and TG-DSC measurements. All the transition metal complexes have octahedral configurations, except Cu-complexes which have planar geometry and the UO 2 (VI) complexes which have coordination number 8 and may acquire the distorted dodecahedral geometry. Thermal studies explored the possibility of obtaining new complexes. Inversion from octahedral to square-planar configuration occurred upon heating the parent Ni-HIAT complex to form the corresponding pyrolytic product. The antifungal activity against the tested organisms showed that some metal complexes enhanced the activity with respect to the parent ligands. (author)

Competitive adsorption of Pb(II), Cu(II), and Zn(II) ions onto hydroxyapatite-biochar nanocomposite in aqueous solutions

Science.gov (United States)

Wang, Yu-Ying; Liu, Yu-Xue; Lu, Hao-Hao; Yang, Rui-Qin; Yang, Sheng-Mao

2018-05-01

A hydroxyapatite-biochar nanocomposite (HAP-BC) was successfully fabricated and its physicochemical properties characterized. The analyses showed that HAP nanoparticles were successfully loaded on the biochar surface. The adsorption of Pb(II), Cu(II), and Zn(II) by HAP-BC was systematically studied in single and ternary metal systems. The results demonstrated that pH affects the adsorption of heavy metals onto HAP-BC. Regarding the adsorption kinetics, the pseudo-second-order model showed the best fit for all three heavy metal ions on HAP-BC. In both single and ternary metal ion systems, the adsorption isotherm of Pb(II) by HAP-BC followed Langmuir model, while those of Cu(II) and Zn(II) fitted well with Freundlich model. The maximum adsorption capacity for each tested metal by HAP-BC was higher than that of pristine rice straw biochar (especially for Pb(II)) or those of other reported adsorbents. Therefore, HAP-BC could explore as a new material for future application in heavy metal removal.

Biosorption characteristics of copper (II), chromium (III), nickel (II), and lead (II) from aqueous solutions by Chara sp. and Cladophora sp.

Science.gov (United States)

Elmaci, Ayşe; Yonar, Taner; Ozengin, Nihan

2007-09-01

The aim of this research was to expose individual removals of copper, chromium, nickel, and lead from aqueous solutions via biosorption using nonliving algae species, Chara sp. and Cladophora sp. Optimum pH values for biosorption of copper (II), chromium (III), nickel (II), and lead (II) from aqueous solutions were determined to be 6, 7, 7, and 3 for Cladophora sp. and 5, 3, 5, and 4 for Chara sp. respectively. Maximum adsorption capacities of Chara sp. [10.54 for chromium (III) and 61.72 for lead (II)] and Cladophora sp. [6.59 for chromium (III) and 16.75 and 23.25 for lead (II)] for chromium (III) and lead (II) are similar. On the other hand, copper (II) and nickel (II) biosorption capacity of Cladophora sp. [14.28 for copper (II) and 16.75 for nickel (II)] is greater than Chara sp. [6.506 for copper (II) and 11.76 for nickel (II)]. Significantly high correlation coefficients indicated for the Langmuir adsorption isotherm models can be used to describe the equilibrium behavior of copper, chromium, nickel, and lead adsorption onto Cladophora sp. and Chara sp.

DNA damage by the cobalt (II) and zinc (II) complexes of ...

African Journals Online (AJOL)

STORAGESEVER

2008-09-03

Sep 3, 2008 ... distributed in grade 3. The results indicated that Co(II)-L induced a relatively high level of DNA damage in comparison with the level of damage induced by Zn(II)-L. Key words: Tetraazamacrocycle Zn(II) complex, tetraazamacrocycle Co(II) complex, Tetrahymena thermophila, DNA damage, the comet assay.

Synthesis and characterization of nickel(II), cobalt(II), copper(II), manganese(II), zinc(II), zirconium(IV), dioxouranium(VI) and dioxomolybdenum(VI) complexes of a new Schiff base derived from salicylaldehyde and 5-methylpyrazole-3-carbohydrazide

International Nuclear Information System (INIS)

Syamal, A.; Maurya, M.R.

1986-01-01

Synthesis of a new Schiff base derived from salicylaldehyde and 5-methylpyrazole-3-carbohydrazide, and its coordination compounds with nickel(II), cobalt(II), copper(II), manganese(II), zinc(II), zirconium(IV), dioxouranium(VI) and dioxomolybdenum(VI) are described. The ligand and the complexes have been characterized on the basis of analytical, conductance, molecular weight, i.r., electronic and n.m.r. spectra and magnetic susceptibility measurements. The stoichiometries of the complexes are represented as NiL . 3H 2 O, CoL . 2H 2 O, CuL, MnL . 2H 2 O, ZnL . H 2 O, Zr(OH) 2 (LH) 2 , Zr(OH) 2 L . 2MeOH, UO 2 L . MeOH and MoO 2 L . MeOH (where LH 2 =Schiff base). The copper(II) complex shows a subnormal magnetic moment due to antiferromagnetic exchange interaction while the nickel(II), cobalt(II) and manganese(II) complexes show normal magnetic moments at room temperature. The i.r. and n.m.r. spectral studies show that the Schiff base behaves as a dibasic and tridentate ligand coordinating through the deprotonated phenolic oxygen, enolic oxygen and azomethine nitrogen. (orig.)

Levels of Cd (II, Mn (II, Pb (II, Cu (II, and Zn (II in Common Buzzard (Buteo buteo from Sicily (Italy by Derivative Stripping Potentiometry

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P. Licata

2010-01-01

Full Text Available The purpose of this study was to determine the concentrations of heavy metals (Cd, Pb, Cu, Mn, and Zn in different organs (liver, kidney, muscle, lung, skin, and feathers of buzzards (Buteo buteo, utilized as a “biological indicator” for environmental contamination, from different areas of Sicily and to investigate the relationships between birds sex, age, and weight and metal levels in these samples. All samples of common buzzards were collected at the “Recovery Center of Wild Fauna” of Palermo, through the Zooprophilactic Institute. Potentiometric stripping analysis (PSA was used to determine the content of Cd(II, Cu(II, Mn(II, Pb(II, and Zn(II in bird tissues. For toxic metals, the highest levels of Pb were in liver and those of Cd in lung; Zn levels were higher than Cu and Mn in all tissues analyzed. The concentrations in liver, lung, kidney, and muscle could be considered as an indicative of chronic exposure to metals while the presence of metals in skin could be consequential to storing and elimination processes. The found concentrations of metals in the studied matrices required a highly sensitive method for their determination and a simple sample preparation procedure, and the proposed method was well suited for this purpose.

Complexes cobalt(II, zinc(II and copper(II with some newly synthesized benzimidazole derivatives and their antibacterial activity

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S. O. PODUNAVAC-KUZMANOVIC

1999-05-01

Full Text Available The preparation and properties of some complexes of cobalt(II, zinc(II and copper(II with several newly synthesized benzimidazole derivatives (L are reported. The complexes, of the general formula [MCl2L2] (M=Co(II, Zn(II and [CuCl2L(H2O], have a tetrahedral structure. The complexes were characterized by elemental analysis, molar conductivity, magnetic susceptibility measurements, IR and absorption electronic spectra. The antibacterial activitiy of the benzimidazoles and their complexes was evaluated against Erwinia carotovora subsp. carotovora and Erwinia amylovora. The complexes were found to be more toxic than the ligands.

Micellar effect on metal-ligand complexes of Co(II, Ni(II, Cu(II and Zn(II with citric acid

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Nageswara Rao Gollapalli

2009-12-01

Full Text Available Chemical speciation of citric acid complexes of Co(II, Ni(II, Cu(II and Zn(II was investigated pH-metrically in 0.0-2.5% anionic, cationic and neutral micellar media. The primary alkalimetric data were pruned with SCPHD program. The existence of different binary species was established from modeling studies using the computer program MINIQUAD75. Alkalimetric titrations were carried out in different relative concentrations (M:L:X = 1:2:5, 1:3:5, 1:5:3 of metal (M to citric acid. The selection of best chemical models was based on statistical parameters and residual analysis. The species detected were MLH, ML2, ML2H and ML2H2. The trend in variation of stability constants with change in mole fraction of the medium is explained on the basis of electrostatic and non-electrostatic forces. Distributions of the species with pH at different compositions of micellar media are also presented.

Complexes of Cu(II), Ni(II), Co(II), oxovanadium(IV) and dioxouranium(VI) with N,N'-ethylenebis (2-hydroxy-4-methylpropiophenoneimine)

International Nuclear Information System (INIS)

Patel, M.M.; Patel, M.R.; Patel, M.N.; Patel, R.P.

1982-01-01

Complexes of Cu(II), Ni(II), Co(II), oxovanadium(IV) and dioxouranium(VI) with the schiff base, N,N'-ethylenebis(2-hydroxy-4-methylpropiophenoneimine)(4-MeOHPEN), have been synthesised and characterised on the basis of elemental analyses, conductivity, magnetic moment, electronic and infrared spectral data. Square-planar structures are suggested for Cu(II), Ni(II) and Co(II) complexes while a distorted square-pyramidal structure is suggested for the oxovanadium(IV) complex. (author)

Elaboration of a Highly Porous RuII,II Analogue of HKUST-1.

Science.gov (United States)

Zhang, Wenhua; Freitag, Kerstin; Wannapaiboon, Suttipong; Schneider, Christian; Epp, Konstantin; Kieslich, Gregor; Fischer, Roland A

2016-12-19

When the dinuclear Ru II,II precursor [Ru 2 (OOCCH 3 ) 4 ] is employed under redox-inert conditions, a Ru II,II analogue of HKUST-1 was successfully prepared and characterized as a phase-pure microcrystalline powder. X-ray absorption near-edge spectroscopy confirms the oxidation state of the Ru centers of the paddle-wheel nodes in the framework. The porosity of 1371 m 2 /mmol of Ru II,II -HKUST-1 exceeds that of the parent compound HKUST1 (1049 m 2 / mmol).

Dynamic adsorption of mixtures of Rhodamine B, Pb (II), Cu (II) and Zn(II) ions on composites chitosan-silica-polyethylene glycol membrane

Science.gov (United States)

Mahatmanti, F. W.; Rengga, W. D. P.; Kusumastuti, E.; Nuryono

2018-04-01

The adsorption of a solution mixture of Rhodamine B, Pb (II), Cu (II) and Zn(II) was studied using dynamic methods employing chitosan-silica-polyethylene glycol (Ch/Si/P) composite membrane as an adsorptive membrane. The composite Ch/Si/P membrane was prepared by mixing a chitosan-based membrane with silica isolated from rice husk ash (ASP) and polyethylene glycol (PEG) as a plasticizer. The resultant composite membrane was a stronger and more flexible membrane than the original chitosan-based membrane as indicated by the maximum percentage of elongation (20.5 %) and minimum Young’s Modulus (80.5 MPa). The composite membrane also showed increased mechanical and hydrophilic properties compared to the chitosan membranes. The membrane was used as adsorption membrane for Pb (II), Cu (II), Cd (II) ions and Rhodamine B dyes in a dynamic system where the permeation and selectivity were determined. The permeation of the components was observed to be in the following order: Rhodamine B > Cd (II) > Pb (II) > Cu (II) whereas the selectivity was shown to decrease the order of Cu (II) > Pb (II) > Cd (II) > Rhodamine B.

Serum insulin-like growth factor II (IGF-II) in chronic heart failure

International Nuclear Information System (INIS)

Tong Lijun; Chen Donghai; Ji Naijun; Fan Bifu; Wang Chengyao; Mei Yibin; Li Fuyuan; Kao Yan

2004-01-01

Objective: To investigate the clinical significance of changes of serum insulin-like growth factor II (IGF-II) levels in patients with chronic heart failure. Methods: Serum IGF-II levels were measured with RIA in 132 cases of chronic heart failure and 45 controls. Results: Serum IGF-II levels were significantly higher in patients with chronic heart failure than those in the controls (t=0.033, P<0.001). IGF-II levels were highest in grade IV CHF patients (vs grade II t=3.963, P<0.01; vs grade III, t=3.578, P<0.01). In the twelve patients died in hospital, the serum IGF-II levels were significantly higher than those patients recovered (t=7.141, P<0.01). Conclusion: Serum IGF-II levels were increased in CHF patients and were highest in the most severe cases. (authors)

Roles sociales de la sociedad contemporánea en la película 'Multiplicity' de Harold Ramis

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Raquel Fernández Cobo

2015-10-01

Full Text Available Multiplicity (2010, dirigida por Harold Ramis, plasma en pantalla a través del motivo del doble los elementos que constituyen la crisis del sujeto y que representan al individuo bajo el signo de la disipación. Mediante un análisis temático y discursivo del motivo del doble examinamos cómo el protagonista, al intentar llevar a cabo la totalidad de los roles sociales, se ve abocada a las contradicciones más agudas de la sociedad, manifestadas, sobre todo, a nivel del cuerpo, tanto en el manifiesto simbolismo del motivo del doble como en el “terror biológico” que de forma absolutamente irónica y humorística se representa en el último clon del protagonista.

Ni(II, Pd(II and Pt(II complexes with ligand containing thiosemicarbazone and semicarbazone moiety: synthesis, characterization and biological investigation

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SULEKH CHANDRA

2008-07-01

Full Text Available The synthesis of nickel(II, palladium(II and platinum(II complexes with thiosemicarbazone and semicarbazone of p-tolualdehyde are reported. All the new compounds were characterized by elemental analysis, molar conductance measurements, magnetic susceptibility measurements, mass, 1H-NMR, IR and electronic spectral studies. Based on the molar conductance measurements in DMSO, the complexes may be formulated as [Ni(L2Cl2] and [M(L2]Cl2 (where M = Pd(II and Pt(II due to their non-electrolytic and 1:2 electrolytic nature, respectively. The spectral data are consistent with an octahedral geometry around Ni(II and a square planar geometry for Pd(II and Pt(II, in which the ligands act as bidentate chelating agents, coordinated through the nitrogen and sulphur/oxygen atoms. The ligands and their metal complexes were screened in vitro against fungal species Alternaria alternata, Aspergillus niger and Fusarium odum, using the food poison technique.

Litiasis única en vesícula doble tratada con ondas de choque extracorpórea Single lithiasis in double gallblader treated with extracorporeal shock waves

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Domingo Pérez González

2004-06-01

Full Text Available La vesícula biliar doble es una anomalía congénita poco frecuente. Su diagnóstico puede realizarse con ultrasonido y colecistografía. Se presenta una paciente de 27 años de edad, con antecedentes de intolerancia a las grasas y cólicos biliares a repetición, con vesícula duplicada; exteriormente fundida y dos conductos císticos independientes que desembocan en el hepatocolécodo, con un cálculo único, de 12 mm de diámetro, retrotransparente y 0 unidades Houndfield, ubicado en el cuello de la vesícula más desarrollada. Se aplicaron 2 259 ondas de choque extracorpóreas de 20,4 kilovoltios, generadas por el principio electromagnético; en una sesión de litroticia. Se detuvo fragmentación completa del cálculo. El tratamiento fue ambulatorio. La paciente se reincorporó a su vida laboral a las 24 horas. Durante la expulsión de los fragmentos tuvo varias crisis de dolor que cedieron con analgésicos orales. A los 6 meses, la vesícula afectada se encontraba libre de fragmentos y funcional. No existió complicación y hasta el momento se mantiene asintomáticaDouble gall bladder is an uncommon congenital abnormality. It may be diagnosed by ultrasound and cholecystography. It is reported the case of a 27-year-old patient with history of intolerance to fats and repeated biliary cholics, with duplicated gallbladder externally fused, and two independent cystic ducts flowing to the hepatocholedoco with a single calculus of 12 mm of diameter, retrotransparent and 0 Houndfield units, located in the neck of the more developed gallbladder. 2 259 extracorporeal shock waves of 20.4 kilovolts generated by the electromagnetic principle were applied in a lithotripsy session. The complete fragmentation of the calculus was stopped. The treatment was ambulatory. The patient reincorporated to her working life at 24 hours. During the expulsion of the fragments, she had several pain crises that were resolved with oral analgesics. Six months later, the

Anti-inflammatory drugs interacting with Zn(II), Cd(II) and Pt(II) metal ions.

Science.gov (United States)

Dendrinou-Samara, C; Tsotsou, G; Ekateriniadou, L V; Kortsaris, A H; Raptopoulou, C P; Terzis, A; Kyriakidis, D A; Kessissoglou, D P

1998-09-01

Complexes of Zn(II), Cd(II) and Pt(II) metal ions with the anti-inflammatory drugs, 1-methyl-5-(p-toluoyl)-1H-pyrrole-2-acetic acid (Tolmetin), alpha-methyl-4-(2-methylpropyl)benzeneacetic acid (Ibuprofen), 6-methoxy-alpha-methylnaphthalene-2-acetic acid (Naproxen) and 1-(4-chlorobenzoyl)-5-methoxy-2-methyl-1H-indole-3-acetic acid (indomethacin) have been synthesized and characterized. In the structurally characterized Cd(naproxen)2 complex the anti-inflammatory drugs acts as bidentate chelate ligand coordinatively bound to metal ions through the deprotonated carboxylate group. Crystal data for 1: [C32H26O8Cd], orthorhombic, space group P22(1)2(1), a = 5.693(2) (A), b = 8.760(3) (A), c = 30.74(1) (A), V = 1533(1) A3, Z = 2. Antibacterial and growth inhibitory activity is higher than that of the parent ligands or the platinum(II) diamine compounds.

Synthesis, spectroscopic and antimicrobial properties of Co(II), Ni (II ...

African Journals Online (AJOL)

The objective of this study is to investigate the antimicrobial activity of novel Schiff base metal complexes. The resistance of micro-organisms to classical antimicrobial compounds poses a challenge to effective management and treatment of some diseases. In line with this, copper (II), nickel (II) and cobalt (II) complexes of ...

RTNS-II [Rotating Target Neutron Source II] operational summary

International Nuclear Information System (INIS)

Heikkinen, D.W.

1988-09-01

The Rotating Target Neutron Source II facility (RTNS-II) operated for over nine years. Its purpose was to provide high intensities of 14 MeV neutrons for materials studies in the fusion energy program. For the period from 1982-1987, the facility was supported by both the US (Department of Energy) and Japan (Ministry of Education, Culture, and Science). RTNS-II contains two accelerator-based neutron sources which use the T(d,n) 4 He reaction. In this paper, we will summarize the operational history of RTNS-II. Typical operating parameters are given. In addition, a brief description of the experimental program is presented. The current status and future options for the facility are discussed. 7 refs., 5 tabs

[Evaluation of serum PIVKA-II by Lumipulse PrestoII assay].

Science.gov (United States)

Hiramatsu, Kumiko; Tanaka, Yasuhito; Takagi, Kazumi; Kani, Satomi; Goto, Takaaki; Takasaka, Yoshimitsu; Matsuura, Kentaro; Sugauchi, Fuminaka; Moriyama, Kazushige; Murakami, Hiroshi; Kitajima, Sachiko; Mizokami, Masashi

2009-03-01

Measurements of serum concentrations of Des-gamma-carboxy Prothrombin (PIVKA-II) are widely used for diagnosing hepatocellular carcinoma (HCC). Recently, in Lumipulsef assay, it was reported that antibodies against alkaline phosphatase (ALP) derived from anti bleeding sheets led false high values of PIVKA-II in the patients with HCC resection. To improve the previous issue, newly developed Lumipulse PrestoII assay was examined. (1) The assay was reliable and positively correlated with the previous assays (Lumipulse f and Picolumi, R = 0.997 and 0.994 (n=115), respectively). (2) Eleven cases, which had false high values of PIVKA-II by the Lumipulsef assay, were examined by the PrestoII assay with excess of inactive ALP. The false high values of 10 cases were improved, but only one was still high. False reactivity of this case was stronger than other cases, more effective adsorption was required. (3) Comparing the absorbent activity of inactive ALP among 6 different kinds, we found inactive ALP with much higher adsorbent activity. When this inactive ALP was applied to assay, false high values of PIVKA-II were improved in all 11 cases. In conclusion, the PrestoII assay, which applies the inactive ALP with high activity, is reliable and useful for clinical screening.

(II) COMPLEX COMPOUND

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electrochemical sensors, as well as in various chromatographic ... were carried out using Jenway pH meter Model 3320 and a conductivity ... Figure 1: the proposed molecular structure of the copper (II) Schiff base complex. M = Cu (II) or Mn (II).

IGF-II receptors and IGF-II-stimulated glucose transport in human fat cells

International Nuclear Information System (INIS)

Sinha, M.K.; Buchanan, C.; Raineri-Maldonado, C.; Khazanie, P.; Atkinson, S.; DiMarchi, R.; Caro, J.F.

1990-01-01

Insulin-like growth factor II (IGF-II) receptors have been described in rat but not in human adipocytes. In both species, IGF-II has been reported to stimulate glucose transport by interacting with the insulin receptor. In this study, we have unequivocally demonstrated the presence of IGF-II receptors in human adipocytes. 125I-labeled IGF-II specifically binds to intact adipocytes, membranes, and lectin-purified detergent solubilized extracts. Through the use of 0.5 mM disuccinimidyl suberate, 125I-IGF-II is cross-linked to a 260-kDa protein that is identified as the IGF-II receptor by displacement experiments with unlabeled IGF-II, IGF-I, and insulin and either by immunoprecipitation or by Western blot analysis with mannose 6-phosphate receptor antibodies. The concentrations of IGF-II required for half-maximal and maximal stimulation of glucose transport in human adipocytes are 35 and 100 times more than that of insulin. The possibility of IGF-II stimulating glucose transport by interacting predominantly with the insulin receptor is suggested by the following: (1) the concentration of IGF-II that inhibits half of insulin binding is only 20 times more than that of insulin; (2) the lack of an additive effect of IGF-II and insulin for maximal stimulation of glucose transport; (3) the ability of monoclonal insulin receptor antibodies to decrease glucose transport stimulated by submaximal concentrations of both IGF-II and insulin; and (4) the ability of IGF-II to stimulate insulin receptor autophosphorylation albeit at a reduced potency when compared with insulin

Emodin (1,3,8-trihydroxy-6-methylanthraquinone): a spectrophotometric reagent for the determination of beryllium(II), magnesium(II) and calcium(II)

International Nuclear Information System (INIS)

Pal, T.; Jana, N.R.

1993-01-01

The individual determination of Be II , Mg II or Ca II by conventional spectrophotometry and simultaneous determination of Mg II and Ca II in mixtures by first-derivative spectrophotometry are possible at trace levels, using emodin (1,3,8-trihydroxy-6-methylanthraquinone) as spectrophotometric reagent. Interference from other metal species, application of these methods to rock samples and statistical analysis of the results are discussed. (author)

Synthesis and studies on Cu(II), Co(II), Ni(II) complexes of Knoevenagel β-diketone ligands

Science.gov (United States)

Sumathi, S.; Tharmaraj, P.; Sheela, C. D.; Anitha, C.

2012-11-01

Transition metal complexes of various acetylacetone based ligands of the type ML [where M = Cu(II), Ni(II), Co(II); L = 3-(aryl)-pentane-2,4-dione] have been synthesized. The structural features have been derived from their elemental analysis, magnetic susceptibility, molar conductance, IR, UV-Vis, 1H NMR, Mass and ESR spectral studies. Conductivity measurements reveal that all the complexes are non-electrolytic in nature. Spectroscopic and other analytical data of the complexes suggest octahedral geometry for other metal(II) complexes. The redox behavior of the copper(II) complexes have been studied by cyclic voltammetry. The free ligands and their metal complexes have been screened for their in vitro biological activities against the bacteria Pseudomonas aeruginosa, Escherichia coli and Staphylococcus aureus as well as the fungus Candida albicans by well diffusion method. The zone of inhibition value indicates that the most of the metal(II) complexes are found to possess increased activities compared to those of the free ligands. All synthesized compounds may serve as potential photoactive materials as indicated from their characteristic fluorescence properties. The second harmonic generation (SHG) efficiency of the ligands (L1-L3) was found to be considerable effect than that of urea and KDP (potassium dihydrogen phosphate).

Bis(tripyrazol-1-ylmethanenickel(II tetracyanidonickelate(II dihydrate

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Sean Parkin

2009-12-01

Full Text Available The title complex, [Ni(C10H10N62][Ni(CN4]·2H2O, contains an octahedral nickel(II cation and a square-planar nickel(II anion. Both the cation and the anion reside on a crystallographic center of inversion. The NiII center in the cation is coordinated by six pyrazol-1-yl rings of two chelating tripyrazol-1-ylmethane [HC(pz3] ligands, with Ni—N distances that range between 2.0647 (19 and 2.0828 (19 Å. The NiII center in the anion is coordinated by four cyanide ligands, with Ni—C distances in the range 1.869 (2–1.869 (3 Å. The [Ni(CN4]2− anions are linked by inversion-related water molecules into extended chains that run parallel to the a axis.

Synthesis and properties of complexes of copper(II), nickel(II), cobalt(II) and uranyl ions with 3-(p-tolylsulphonamido)rhodamine

International Nuclear Information System (INIS)

El-Bindary, A.A.; El-Sonbati, A.Z.

2000-01-01

Metal complexes of copper(II), nickel(II), cobalt(II) and uranyl ions with 3-(p-tolylsulphonamido)rhodamine (HL) have been prepared and characterized by chemical and thermal analyses, molar conductivity , magnetic susceptibility measurements, and infrared, electronic and EPR spectra. The visible and EPR spectra indicated that the Cu(II) complex has a tetragonal geometry. From EPR spectrum of the Cu(II) complex,various parameters were calculated. The crystal field parameters of Ni(II) complex were calculated and were found to agree fairly well with the values reported for known square pyramidal complexes. The infrared spectral studies showed a monobasic bidentate behaviour with the oxygen and nitrogen donor system. Thermal stabilities of the complexes are also reported. (author)

Adsorption study of cadmium (II) and lead (II) on radish peels

International Nuclear Information System (INIS)

Anwar, J.; Shafique, U.; Salman, M.; Zaman, W.; Memoona, M.

2009-01-01

The removal efficiency of heavy metals like Cd(II) and Pb(II) from aqueous solutions by adsorption on Raphanus sativus (Radish peels) has been studied. The effects of time, pH, concentration of adsorbent and agitation speed on adsorption have been evaluated. It is found that radish peels powder has high removal efficiency for both the metals. Batch adsorption study has shown that Cd(II) and Pb(II) has been removed up to 88% and 86% respectively. Adsorption equilibriums for both metals have been described by the Langmuir isotherm. The maximum amount of heavy metals (Q ) adsorbed at max equilibrium were 7.5 and 1.23 mg/g for Cd(II) and Pb(II) respectively as evaluated by Langmuir isotherm. It is concluded that waste materials like radish peels can be used for removal of heavy metals from aqueous streams. (author)

Evaluation of climatic forecasts of rainfall for the Tlaxcala State (Mexico): 1998-2002

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Gay Garcia, C. [Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico (UNAM), Mexico, D.F. (Mexico); Hernandez Vazquez, M.; Jimenez Lopez, J. [Centro de Investigaciones en Ciencias Biologicas, Universidad Autonoma de Tlaxcala, Tlaxcala (Mexico); Lezama Gutierrez, J. [Departamento de Agrobiologia, Universidad Autonoma de Tlaxcala, Tlaxcala (Mexico); Magana Rueda, V.O.; Morales Acoltzi, T. [Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico, UNAM, Mexico, D.F. (Mexico); Orozco Flores, S. [Centro de Investigaciones en Ciencias Biologicas, Universidad Autonoma de Tlaxcala, Tlaxcala (Mexico)

2004-07-01

During the second semester of 1997 the Project Utilizacion de pronosticos climaticos para actividades agricolas de Tlaxcala was instrumented with the purpose of aiding decision making in agricultural activities in the estate of Tlaxcala, Mexico. The main objective of the project was to characterize extreme values of precipitation associated with El Nino/La Nina events, to produce useful forecasts for decision making. This was achieved through close contacts with the farmers whose specific needs were taken into account to the extent possible. In a sense such forecasts became forecasts watched over by producers. The method of ensemble of analogs was applied to historical data. The evaluation of annual and monthly forecasts is presented here. The results show that knowledge about the regional climate has been gained as it is reflected by the skill of the method to forecast. The forecast for the region, for the year 2003 is analyzed in terms of the precipitation anomalies. [Spanish] En el segundo semestre de 1997, se implemento el proyecto de investigacion Utilizacion de pronosticos climaticos para actividades agricolas en el estado de Tlaxcala. El objetivo principal del proyecto original fue el de caracterizar valores extremos de precipitacion asociados a los eventos El Nino/La Nina, producir pronosticos mensuales de precipitacion que fueran practicos en la toma de decisiones para los cultivos de temporal. Esto ultimo fue discutido con los productores cuyas necesidades y sugerencias fueron tomadas en cuenta, considerando un pronostico lo mas extendido posible. De esta manera los pronosticos se tornaron Pronosticos vigilados por los productores. El metodo de ensamble de analogos observados fue aplicado para generar los pronosticos de 1998-2002. La evaluacion de los pronosticos anuales y mensuales se presenta aqui. Los resultados muestran que se ha ganado conocimiento acerca del clima regional, como se refleja en la habilidad del metodo para pronosticar. Por ultimo, se

New complexes of Co(II, Ni(II, Cu(II with Schiff base N,N’-bis-(3-methoxy-saliciliden-3,3’-dimethylbenzidine

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Alan Ionela

2013-01-01

Full Text Available The new N,N’-bis-(3-methoxy-saliciliden-3,3’-dimetilbenzidine (H2L Schiff base and complexes with Co(II, Ni(II and Cu(II of type [M(HLCl(H2O] (M=Co(II, Cu(II [M2L(H2O4]X2 (M=Co(II, X=ClO4 and M=Cu(II, X=NO3 and [M2L(CH3COO2] (M=Co(II, Ni(II, Cu(II were synthesised. The ligand and complexes were characterized by elemental analysis, conductibility measurements, magnetic moments at room temperature, IR, NMR, UV-VIS-NIR, EPR spectra and thermogravimetric analysis. A molar ratio of 1:1 or 1:2 between ligand and metal was determined from the elemental analysis. Except for perchlorate complex that behave as electrolyte, the rest of complexes are non-electrolytes. The spectral data suggest a tetrahedral, pseudo-tetrahedral or square-planar stereochemistry respectively, data confirmed by magnetic behaviour of complexes. The antimicrobial tests indicate a fungicide effect both for ligand and complexes.

and copper(II)

Indian Academy of Sciences (India)

Unknown

(II) and copper(II)–zinc(II) complexes. SUBODH KUMAR1, R N PATEL1*, P V KHADIKAR1 and. K B PANDEYA2. 1 Department of Chemistry, APS University, Rewa 486 003, India. 2 CSJM University, Kanpur 208 016, India e-mail: (R N Patel) ...

Determination of Lead(II), Cadmium(II) and Copper(II) in Waste-Water and Soil Extracts on Mercury Film Screen-Printed Carbon Electrodes Sensor

International Nuclear Information System (INIS)

Mohd Fairulnizal Md Noh; Tothill, I.E.

2011-01-01

A sensor incorporating a three electrodes configuration have been fabricated using low cost screen-printing technology. These electrodes couples with Square Wave Stripping Voltammetry (SWSV) has provided a convenient screening tool for on-site detection of trace levels of Pb(II), Cd(II) and Cu(II). Modification of the graphite carbon surface based on in situ deposition of mercury film has been carried out. By appropriate choice of supporting medium and optimized parameters setting such as amount of mercury used the deposition potential, deposition time, frequency and scan rate, well resolved and reproducible response for Pb(II), Cd(II) and Cu(II) were obtained. The performance characteristics of the developed mercury film screen printed carbon electrode (MFSPCE) for 120 s deposition time showed that the linear range for Cd(II), Pb(II) and Cu(II) were 10 to 200 μg L -1 . The detection limit recorded for Cd(II), Pb(II) and Cu(II) were 2, 1 and 5 μg L -1 with relative standard deviation (RSD) of 6.5 %, 6.9 % and 7.5 %, respectively. Successful applications of the sensing device to waste-water and extracted soil samples were demonstrated. (author)

Kinetic and spectroscopic investigation of CoII, NiII, and N-oxalylglycine inhibition of the FeII/α-ketoglutarate dioxygenase, TauD

International Nuclear Information System (INIS)

Kalliri, Efthalia; Grzyska, Piotr K.; Hausinger, Robert P.

2005-01-01

Co II , Ni II , and N-oxalylglycine (NOG) are well-known inhibitors of Fe II /α-ketoglutarate (αKG)-dependent hydroxylases, but few studies describe their kinetics and no spectroscopic investigations have been reported. Using taurine/αKG dioxygenase (TauD) as a paradigm for this enzyme family, time-dependent inhibition assays showed that Co II and Ni II follow slow-binding inhibition kinetics. Whereas Ni II -substituted TauD was non-chromophoric, spectroscopic studies of the Co II -substituted enzyme revealed a six-coordinate site (protein alone or with αKG) that became five-coordinate upon taurine addition. The Co II spectrum was not perturbed by a series of anions or oxidants, suggesting the Co II is inaccessible and could be used to stabilize the protein. NOG competed weakly (K i ∼ 290 μM) with αKG for binding to TauD, with the increased electron density of NOG yielding electronic transitions for NOG-Fe II -TauD and taurine-NOG-Fe II -TauD at 380 nm (ε 38 90-105 M -1 cm -1 ). The spectra of the NOG-bound TauD species did not change significantly upon oxygen exposure, arguing against the formation of an oxygen-bound state mimicking an early intermediate in catalysis

II-VI semiconductor compounds

CERN Document Server

1993-01-01

For condensed matter physicists and electronic engineers, this volume deals with aspects of II-VI semiconductor compounds. Areas covered include devices and applications of II-VI compounds; Co-based II-IV semi-magnetic semiconductors; and electronic structure of strained II-VI superlattices.

Syntheses, structures, and properties of imidazolate-bridged Cu(II)-Cu(II) and Cu(II)-Zn(II) dinuclear complexes of a single macrocyclic ligand with two hydroxyethyl pendants.

Science.gov (United States)

Li, Dongfeng; Li, Shuan; Yang, Dexi; Yu, Jiuhong; Huang, Jin; Li, Yizhi; Tang, Wenxia

2003-09-22

The imidazolate-bridged homodinuclear Cu(II)-Cu(II) complex, [(CuimCu)L]ClO(4).0.5H(2)O (1), and heterodinuclear Cu(II)-Zn(II) complex, [(CuimZnL(-)(2H))(CuimZnL(-)(H))](ClO(4))(3) (2), of a single macrocyclic ligand with two hydroxyethyl pendants, L (L = 3,6,9,16,19,22-hexaaza-6,19-bis(2-hydroxyethyl)tricyclo[22,2,2,2(11,14)]triaconta-1,11,13,24,27,29-hexaene), have been synthesized as possible models for copper-zinc superoxide dismutase (Cu(2),Zn(2)-SOD). Their crystal structures analyzed by X-ray diffraction methods have shown that the structures of the two complexes are markedly different. Complex 1 crystallizes in the orthorhombic system, containing an imidazolate-bridged dicopper(II) [Cu-im-Cu](3+) core, in which the two copper(II) ions are pentacoordinated by virtue of an N4O environment with a Cu.Cu distance of 5.999(2) A, adopting the geometry of distorted trigonal bipyramid and tetragonal pyramid, respectively. Complex 2 crystallizes in the triclinic system, containing two similar Cu-im-Zn cores in the asymmetric unit, in which both the Cu(II) and Zn(II) ions are pentacoordinated in a distorted trigonal bipyramid geometry, with the Cu.Zn distance of 5.950(1)/5.939(1) A, respectively. Interestingly, the macrocyclic ligand with two arms possesses a chairlike (anti) conformation in complex 1, but a boatlike (syn) conformation in complex 2. Magnetic measurements and ESR spectroscopy of complex 1 have revealed the presence of an antiferromagnetic exchange interaction between the two Cu(II) ions. The ESR spectrum of the Cu(II)-Zn(II) heterodinuclear complex 2 displayed a typical signal for mononuclear trigonal bipyramidal Cu(II) complexes. From pH-dependent ESR and electronic spectroscopic studies, the imidazolate bridges in the two complexes have been found to be stable over broad pH ranges. The cyclic voltammograms of the two complexes have been investigated. Both of the two complexes can catalyze the dismutation of superoxide and show rather high activity.

Syntheses of polystyrene supported chelating resin containing the Schiff base derived from salicylaldehyde and triethylene tetramine and its copper(II), nickel(II), cobalt(II), iron(III), zinc(II), cadmium(II), molybdenum(VI), zirconium(IV) and uranium(VI) complexes

International Nuclear Information System (INIS)

Syamal, A.; Singh, M.M.

1998-01-01

A new polymer-anchored chelating ligand has been synthesized by the reaction of chloromethylated polystyrene (containing 0.94 mmol of Cl per gram of resin and 1% cross-linked with divinylbenzene) and the Schiff base derived from salicylaldehyde and triethylenetetramine. A new series of polystyrene supported, Cu(II), Ni(II), Co(II), Fe(III), Zn(II), Cd(II), Zr(IV), dioxomolybdenum (VI) and dioxouranium (VI) complexes of the formulae PS-LCu, PS-LNi, PS-LCo, PS-LFeCl.DMF, PS-LZn, PS-LCd, PS-LZr(OH) 2 . DMF, PS L MoO 2 and PS-LUO 2 (where PS-LH 2 = polymer-anchored Schiff base and DMF dimethyl-formamide) have been synthesized and characterised by elemental analysis, infrared, electronic spectra and magnetic susceptibility measurements. The complexes PS-LCu, PS-LNi and PS-LCo have square planar structure, PS-LFeCl.DMF, PS-LMoO 2 and PS-LUO 2 have octahedral structure, PS L Zn and PS-LCd are tetrahedral and PS-LZr(OH) 2 .DMF is pentagonal bipyramidal. The polymer-anchored Cu(II), Co(II) and Fe(III) complexes are paramagnetic while Ni(II), Zn(II), Cd(II), Zr(IV), dioxomolybdenum(VI) and dioxouranium(VI) complexes are diamagnetic. The negative shift of the v (C=N) (azomethine) and the positive shift of v (C--O)(phenolic) are indicative of ONNO donor behaviour of the polymer-anchored Schiff base. (author)

DNA binding and biological activity of mixed ligand complexes of Cu(II, Ni(II and Co(II with quinolones and N donor ligand

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S.M M Akram

2015-10-01

Full Text Available  AbstractMixed ligand complexes of  Cu(II, Ni(II and Co(II have been synthesized by using levofloxacin and bipyridyl and characterized using spectral and analytical techniques. The binding behavior of the Ni(II and Cu(II complexes with herring sperm DNA(Hs-DNA were determined using electronic absorption titration, viscometric measurements and cyclic voltammetry measurements. The binding constant calculated  for Cu(II and Ni(II complexes are 2.0 x 104 and 4.0 x 104 M-1 respectively. Detailed analysis reveals that these metal complexes interact with DNA through intercalative binding mode. The nuclease activity of  Cu(II and Ni(II complexes with ct-DNA was carried out using agarose gel electrophoresis technique. The antioxidant activities for the synthesized complexes have been tested and the antibacterial activity for Ni(II complex was also checked.Key words: Intercalation, hypochromism, red shift and  peak potential.

La fábrica de doble hoja en Madrid, un siglo de cerramiento moderno

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Ros García, Juan Manuel

2005-02-01

highlight the generation of trends in the use of technical systems for the compositional organization of each enclosure studied and all of them taken together, identifying the existence of the application of certain construction solutions related to internal architectural requirements, such as the representative and social nature of the work, economic resources available, compliance with the existing legislation, adaptation to a specific programme, growing importance of social satisfaction in residential endeavours, changes introduced with the appearance of new structural typologies, presence of buildings as the urban repercussion on city planning and new developments, and so on Hence, the internal consistency of a real change in the process of ideological modernity was favoured by the generalized constructional rationalization of the technical progress that made it possible; the purpose of this brief article is to discuss and evaluate each case in experimental terms.

El presente trabajo se centra en el desarrollo y la implantación del sistema de doble hoja en los cerramientos de fábrica dentro de la arquitectura residencial madrileña a lo largo de los dos primeros tercios del siglo XX. De una parte, se aborda la cuestión desde un campo de comprensión histórica comparada, en la que pueda llegarse a definir una conciencia clara de evolución o de impulso de progreso a través de ciertas y reconocidas manifestaciones arquitectónicas que sucedieron paralelamente con el período de revolución técnica en Europa y su más lenta penetración en nuestro país, centrando el análisis en su localización madrileña. De otra, se consideran los sistemas y métodos constructivos generales aplicados a distintas tipologías y determinados ejemplos notables, con el fin de asociarlos a posibles modos de innovación técnica en los procesos expansivos de la vivienda de calidad arquitectónica, a la que se atribuye una coherencia material y formal. La incorporación de los

Derecho y Literatura: Anatoliĭ Fedorovich Koni (1844-1927 (Sobre Cultura jurídica de la literatura y Cultura literaria del Derecho en la Rusia imperial de Alejandro II a Nicolás II

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José Calvo González

2011-01-01

Full Text Available El trabajo aborda la figura del eminente jurista ruso Anatoliĭ Fedorovich Koni, representativa de la corriente jurídica liberal-moderada en la etapa prerevolucionaria de Rusia. Recupera en su obra su interés por el gran mentor de la literatura rusa moderna, Pushkin, que vincula al programa de modernización inaugurado con las reformas judiciales de 1864. Detalla igualmente las relaciones personales con escritores contemporáneos, entre los que aparecen Chéjov, Dostoiesvki y Tolstói. Sobre esta base proyecta las imbricaciones Derecho y Literatura en una doble dirección, incluyendo las reflexiones jurídicas a partir de textos literarios así como las potencialidades de las categorías jurídicas en la creación literaria. Finalmente, inserta ambas construcciones en el ambiente de una cultura literaria y jurídica que estaba prefigurando el modernismo literario y (efímero y fallido modernismo jurídico.

Mixed ligand complexes of alkaline earth metals: Part XII. Mg(II, Ca(II, Sr(II and Ba(II complexes with 5-chlorosalicylaldehyde and salicylaldehyde or hydroxyaromatic ketones

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MITHLESH AGRAWAL

2002-04-01

Full Text Available The reactions of alkaline earth metal chlorides with 5-chlorosalicylaldehyde and salicylaldehyde, 2-hydroxyacetophenone or 2-hydroxypropiophenone have been carried out in 1 : 1 : 1 mole ratio and the mixed ligand complexes of the type MLL’(H2O2 (where M = Mg(II, Ca(II, Sr(II and Ba(II, HL = 5-chlorosalicylaldehyde and HL’ = salicylaldehyde, 2-hydroxyacetophenone or 2-hydroxypropiophenone have been isolated. These complexes were characterized by TLC, conductance measurements, IR and 1H-NMR spectra.

Intrafibrillar Mineral May be Absent in Dentinogenesis Imperfecta Type II (DI-II)

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Pople, John A

2001-03-29

High-resolution synchrotron radiation computed tomography (SRCT) and small angle x-ray scattering (SAXS) were performed on normal and dentinogenesis imperfecta type II (DI-II) teeth. Three normal and three DI-II human third molars were used in this study. The normal molars were unerupted and had intact enamel; donors were female and ranged in age from 18-21y. The DI-II specimens, which were also unerupted with intact enamel, came from a single female donor age 20y. SRCT showed that the mineral concentration was 33% lower on average in the DI-II dentin with respect to normal dentin. The SAXS spectra from normal dentin exhibited low-angle diffraction peaks at harmonics of 67.6 nm, consistent with nucleation and growth of the apatite phase within gaps in the collagen fibrils (intrafibrillar mineralization). In contrast, the low-angle peaks were almost nonexistent in the DI-II dentin. Crystallite thickness was independent of location in both DI-II and normal dentin, although the crystallites were significantly thicker in DI-II dentin (6.8 nm (s.d. = 0.5) vs 5.1 nm (s.d. = 0.6)). The shape factor of the crystallites, as determined by SAXS, showed a continuous progression in normal dentin from roughly one-dimensional (needle-like) near the pulp to two-dimensional (plate-like) near the dentin-enamel junction. The crystallites in DI-II dentin, on the other hand, remained needle-like throughout. The above observations are consistent with an absence of intrafibrillar mineral in DI-II dentin.

Adsorption of Cu(II), Hg(II), and Ni(II) ions by modified natural wool chelating fibers

International Nuclear Information System (INIS)

Monier, M.; Ayad, D.M.; Sarhan, A.A.

2010-01-01

The graft copolymerization of ethyl acrylate (EA) onto natural wool fibers initiated by potassium persulphate and Mohr's salt redox initiator system in limited aqueous medium was carried out in heterogeneous media. Ester groups of the grafted copolymers were partially converted into hydrazide function groups followed by hydrazone formation through reaction with isatin. Also the application of the modified fibers for metal ion uptake was studied using Cu(II), Hg(II) and Ni(II). The modified chelating fibers were characterized using FTIR spectroscopy, SEM and X-ray diffraction.

Cd(II and Pb(II complexes of the polyether ionophorous antibiotic salinomycin

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Tanabe Makoto

2011-09-01

Full Text Available Abstract Background The natural polyether ionophorous antibiotics are used for the treatment of coccidiosis in poultry and ruminants. They are effective agents against infections caused by Gram-positive microorganisms. On the other hand, it was found that some of these compounds selectively bind lead(II ions in in vivo experiments, despite so far no Pb(II-containing compounds of defined composition have been isolated and characterized. To assess the potential of polyether ionophores as possible antidotes in the agriculture, a detailed study on their in vitro complexation with toxic metal ions is required. In the present paper we report for the first time the preparation and the structure elucidation of salinomycin complexes with ions of cadmium(II and lead(II. Results New metal(II complexes of the polyether ionophorous antibiotic salinomycin with Cd(II and Pb(II ions were prepared and structurally characterized by IR, FAB-MS and NMR techniques. The spectroscopic information and elemental analysis data reveal that sodium salinomycin (SalNa undergoes a reaction with heavy metal(II ions to form [Cd(Sal2(H2O2] (1 and [Pb(Sal(NO3] (2, respectively. Abstraction of sodium ions from the cavity of the antibiotic is occurring during the complexation reaction. Salinomycin coordinates with cadmium(II ions as a bidentate monoanionic ligand through the deprotonated carboxylic moiety and one of the hydroxyl groups to yield 1. Two salinomycin anions occupy the equatorial plane of the Cd(II center, while two water molecules take the axial positions of the inner coordination sphere of the metal(II cation. Complex 2 consists of monoanionic salinomycin acting in polydentate coordination mode in a molar ratio of 1: 1 to the metal ion with one nitrate ion for charge compensation. Conclusion The formation of the salinomycin heavy metal(II complexes indicates a possible antidote activity of the ligand in case of chronic/acute intoxications likely to occur in the stock

Cd(II) and Pb(II) complexes of the polyether ionophorous antibiotic salinomycin

Science.gov (United States)

2011-01-01

Background The natural polyether ionophorous antibiotics are used for the treatment of coccidiosis in poultry and ruminants. They are effective agents against infections caused by Gram-positive microorganisms. On the other hand, it was found that some of these compounds selectively bind lead(II) ions in in vivo experiments, despite so far no Pb(II)-containing compounds of defined composition have been isolated and characterized. To assess the potential of polyether ionophores as possible antidotes in the agriculture, a detailed study on their in vitro complexation with toxic metal ions is required. In the present paper we report for the first time the preparation and the structure elucidation of salinomycin complexes with ions of cadmium(II) and lead(II). Results New metal(II) complexes of the polyether ionophorous antibiotic salinomycin with Cd(II) and Pb(II) ions were prepared and structurally characterized by IR, FAB-MS and NMR techniques. The spectroscopic information and elemental analysis data reveal that sodium salinomycin (SalNa) undergoes a reaction with heavy metal(II) ions to form [Cd(Sal)2(H2O)2] (1) and [Pb(Sal)(NO3)] (2), respectively. Abstraction of sodium ions from the cavity of the antibiotic is occurring during the complexation reaction. Salinomycin coordinates with cadmium(II) ions as a bidentate monoanionic ligand through the deprotonated carboxylic moiety and one of the hydroxyl groups to yield 1. Two salinomycin anions occupy the equatorial plane of the Cd(II) center, while two water molecules take the axial positions of the inner coordination sphere of the metal(II) cation. Complex 2 consists of monoanionic salinomycin acting in polydentate coordination mode in a molar ratio of 1: 1 to the metal ion with one nitrate ion for charge compensation. Conclusion The formation of the salinomycin heavy metal(II) complexes indicates a possible antidote activity of the ligand in case of chronic/acute intoxications likely to occur in the stock farming

Synthesis and characterization of zinc(II), cadmium(II) and mercury(II) complexes with bis(bidentate) Schiff bases

International Nuclear Information System (INIS)

Das, Mrinal Kanti; Ghosh, Shyamali

1998-01-01

A few Zn(II), Cd(II) and Hg(II) complexes of the bis(bidentate) Schiff bases derived from p-phenylenediamine and salicylaldehyde (H 2 Salpphen), and o-phenylenediamine and o-vanillin (H 2 Vanophen), of the type MCl 2 .H 2 L(H 2 L = H 2 Salpphen or H 2 Vanophen) have been synthesised. The complexes have been characterized by elemental analysis, infrared, 1 H and 13 C NMR and mass spectra. (author)

Synthesis, characterization and biological studies of 2-(4-nitro phenylaminocarbonyl)benzoic acid and its complexes with Cr(III), Co(II), Ni(II), Cu(II) and Zn(II)

International Nuclear Information System (INIS)

Aqeel Ashraf, M.; Jamil Maah, M.; Yusuf, I.

2012-01-01

Cr(III), Co(II), Ni(II), Cu(II) and Zn(II) salts of 2-(4-nitro phenylaminocarbonyl)benzoic acid were characterized by physical, analytical and spectroscopic studies and checked for their in-vitro antimicrobial activity against three bacterial strains, Mycobacterium smegmatis (Gram +ve), Escherichia coli (Gram -ve), Pseudomonas aeuroginosa (Gram -ve) and three fungal strains, Nigrospora oryzae, Aspergillus niger and Candida albicans. The antimicrobial activities of the metal complexes - were found to be greater than those of 2-(4-nitro phenylaminocarbonyl)benzoic acid alone.

Adsorption of Cu(II), Hg(II), and Ni(II) ions by modified natural wool chelating fibers

Energy Technology Data Exchange (ETDEWEB)

Monier, M., E-mail: monierchem@yahoo.com [Chemistry Department, Drexel University, Philadelphia, PA (United States); Chemistry Department, Faculty of Science, Mansoura University, Mansoura (Egypt); Ayad, D.M.; Sarhan, A.A. [Chemistry Department, Faculty of Science, Mansoura University, Mansoura (Egypt)

2010-04-15

The graft copolymerization of ethyl acrylate (EA) onto natural wool fibers initiated by potassium persulphate and Mohr's salt redox initiator system in limited aqueous medium was carried out in heterogeneous media. Ester groups of the grafted copolymers were partially converted into hydrazide function groups followed by hydrazone formation through reaction with isatin. Also the application of the modified fibers for metal ion uptake was studied using Cu(II), Hg(II) and Ni(II). The modified chelating fibers were characterized using FTIR spectroscopy, SEM and X-ray diffraction.

Adsorption of Cu(II), Hg(II), and Ni(II) ions by modified natural wool chelating fibers.

Science.gov (United States)

Monier, M; Ayad, D M; Sarhan, A A

2010-04-15

The graft copolymerization of ethyl acrylate (EA) onto natural wool fibers initiated by potassium persulphate and Mohr's salt redox initiator system in limited aqueous medium was carried out in heterogeneous media. Ester groups of the grafted copolymers were partially converted into hydrazide function groups followed by hydrazone formation through reaction with isatin. Also the application of the modified fibers for metal ion uptake was studied using Cu(II), Hg(II) and Ni(II). The modified chelating fibers were characterized using FTIR spectroscopy, SEM and X-ray diffraction. 2009 Elsevier B.V. All rights reserved.

Kinetic study on adsorption of Cr(VI), Ni(II), Cd(II) and Pb(II) ions from aqueous solutions using activated carbon prepared from Cucumis melo peel

Science.gov (United States)

Manjuladevi, M.; Anitha, R.; Manonmani, S.

2018-03-01

The adsorption of Cr(VI), Ni(II), Cd(II) and Pb(II), ions from aqueous solutions by Cucumis melo peel-activated carbon was investigated under laboratory conditions to assess its potential in removing metal ions. The adsorption behavior of metal ions onto CMAC was analyzed with Elovich, intra-particle diffusion rate equations and pseudo-first-order model. The rate constant of Elovich and intra-particle diffusion on CMAC increased in the sequence of Cr(VI) > Ni(II) > Cd(II) > Pb(II). According to the regression coefficients, it was observed that the kinetic adsorption data can fit better by the pseudo-first-order model compared to the second-order Lagergren's model with R 2 > 0.957. The maximum adsorption of metal ions onto the CMAC was found to be 97.95% for Chromium(VI), 98.78% for Ni(II), 98.55% for Pb(II) and 97.96% for Cd(II) at CMAC dose of 250 mg. The adsorption capacities followed the sequence Ni(II) ≈ Pb(II) > Cr(VI) ≈ Cd(II) and Ni(II) > Pb(II) > Cd(II) > Cr(VI). The optimum adsorption conditions selected were adsorbent dosage of 250 mg, pH of 3.0 for Cr(VI) and 6.0 for Ni(II), Cd(II) and Pb(II), adsorption concentration of 250 mg/L and contact time of 180.

Standardization of radioimmunoassay for dosage of angiotensin II (ang-II) and its methodological evaluation; Padronizacao do radioimunoensaio para dosagem de angiotensina II (ang-II) e sua validacao metodologica

Energy Technology Data Exchange (ETDEWEB)

Mantovani, Milene; Mecawi, Andre S.; Elias, Lucila L.K.; Antunes-Rodrigues, Jose, E-mail: llelias@fmrp.usp.b, E-mail: antunes@fmrp.usp.b [Universidade de Sao Paulo (FMRP/USP), Ribeirao Preto, SP (Brazil). Faculdade de Medicina

2011-10-26

This paper standardizes the radioimmunoassay (RIA) for dosage of ANG-II of rats, after experimental conditions of saline hypertonic (2%), treating with losartan (antagonist of ANG-II), hydric privation, and acute hemorrhage (25%). After that, the plasmatic ANG-II was extracted for dosage of RIA, whose sensitiveness was of 1.95 pg/m L, with detection of 1.95 to 1000 pg/m L. The treatment with saline reduced the concentration of ANG-II, while the administration pf losartan, the hydric administration and the hemorrhage increase the values, related to the control group. Those results indicate variations in the plasmatic concentration of ANG-II according to the experimental protocols, validating the method for evaluation of activity renin-angiotensin

Pius II. a utrakvismus

OpenAIRE

Šimek, Milan

2009-01-01

Milan Šimek Pius II. a utrakvismus Pius II. and utraquism Based on sources work - out, the thesis aims the description and analysis of the attitude alternation of Enea Sylvio Piccolomini - Pius II to the utraquism. The conclusions stress the postulate that Pius II. did not change that attitude, but just did not succed in quelling the utraquist movement. In the sense of political background that finally led to fatal dissention among both leaders, king Jiří of Poděbrady and pope Pius II.

Biosorption of Cd(II) and Zn(II) by nostoc commune: isotherm and kinetics studies

Energy Technology Data Exchange (ETDEWEB)

Morsy, Fatthy M. [Faculty of Science, Botany Department, Assiut University, Assiut (Egypt); Hassan, Sedky H.A. [Department of Biological Environment, Kangwon National University, Kangwon-do (Korea, Republic of); Koutb, Mostafa [Faculty of Science, Botany Department, Assiut University, Assiut (Egypt); Umm Al-Qura University, Faculty of Applied Science, Biology Department, Mecca (Saudi Arabia)

2011-07-15

In this study, Nostoc commune (cyanobacterium) was used as an inexpensive and efficient biosorbent for Cd(II) and Zn(II) removal from aqueous solutions. The effect of various physicochemical factors on Cd(II) and Zn(II) biosorption such as pH 2.0-7.0, initial metal concentration 0.0-300 mg/L and contact time 0-120 min were studied. Optimum pH for removal of Cd(II) and Zn(II) was 6.0, while the contact time was 30 min at room temperature. The nature of biosorbent and metal ion interaction was evaluated by infrared (IR) technique. IR analysis of bacterial biomass revealed the presence of amino, carboxyl, hydroxyl, and carbonyl groups, which are responsible for biosorption of Cd(II) and Zn (II). The maximum biosorption capacities for Cd(II) and Zn(II) biosorption by N. commune calculated from Langmuir biosorption isotherm were 126.32 and 115.41 mg/g, respectively. The biosorption isotherm for two biosorbents fitted well with Freundlich isotherm than Langmuir model with correlation coefficient (r{sup 2} < 0.99). The biosorption kinetic data were fitted well with the pseudo-second-order kinetic model. Thus, this study indicated that the N. commune is an efficient biosorbent for the removal of Cd(II) and Zn(II) from aqueous solutions. (Copyright copyright 2011 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

Cadmium(II) and lead(II) adsorption onto hetero-atom functional mesoporous silica and activated carbon

Science.gov (United States)

Machida, Motoi; Fotoohi, Babak; Amamo, Yoshimasa; Mercier, Louis

2012-07-01

Adsorption of cadmium(II) and lead(II) on amino-, mercapto-functionalized mesoporous silica (HMS) and carboxylic-functionalized activated carbon (AC) were examined. The resultant isotherms fitted the Langmuir model and amino-functionalized HMS exhibited the highest adsorption capacity for both cadmium(II) and lead(II). Adsorption affinities for cadmium(II) were always greater than those for lead(II) in all three adsorbent types, while the difference between the two values was the largest for mercapto-functionalized HMS indicating a selective adsorption of cadmium(II). Influence of equilibrium solution pH on adsorption of cadmium(II), lead(II) and their binary mixtures was also studied. Carboxylic-functionalized AC adsorbed cadmium(II) and lead(II) in a wide pH range than conditions for the mercapto-functionalized HMS. It was concluded that each functional group had its own characteristics and advantages for adsorption of heavy metal ions; amino-groups showed high adsorption capacity, while mercapto-groups had good selectivity toward cadmium(II) adsorption and a wide solution pH in adsorption by carboxylic-groups were established in this study.

Cadmium(II) and lead(II) adsorption onto hetero-atom functional mesoporous silica and activated carbon

International Nuclear Information System (INIS)

Machida, Motoi; Fotoohi, Babak; Amamo, Yoshimasa; Mercier, Louis

2012-01-01

Adsorption of cadmium(II) and lead(II) on amino-, mercapto-functionalized mesoporous silica (HMS) and carboxylic-functionalized activated carbon (AC) were examined. The resultant isotherms fitted the Langmuir model and amino-functionalized HMS exhibited the highest adsorption capacity for both cadmium(II) and lead(II). Adsorption affinities for cadmium(II) were always greater than those for lead(II) in all three adsorbent types, while the difference between the two values was the largest for mercapto-functionalized HMS indicating a selective adsorption of cadmium(II). Influence of equilibrium solution pH on adsorption of cadmium(II), lead(II) and their binary mixtures was also studied. Carboxylic-functionalized AC adsorbed cadmium(II) and lead(II) in a wide pH range than conditions for the mercapto-functionalized HMS. It was concluded that each functional group had its own characteristics and advantages for adsorption of heavy metal ions; amino-groups showed high adsorption capacity, while mercapto-groups had good selectivity toward cadmium(II) adsorption and a wide solution pH in adsorption by carboxylic-groups were established in this study.

Synthesis, characterization and biological studies of metal complexes of Co (II), Ni (II), Cu (II), Zn (II) with sulphadimidine-benzylidene

International Nuclear Information System (INIS)

Tahira, F.; Imran, M.; Iqbal, J.

2009-01-01

Some novel complexes of Co (II), Ni (II), Cu (II), and Zn (II) have been synthesized with a Schiff base ligand derived from sulphadimidine and benzaldehyde. The structural features of the complexes have been determined by elemental analysis, magnetic susceptibility, conductance measurement, UV/ Vis. and infrared spectroscopy. IR studies revealed that the Schiff base ligand Sulphadimidine-benzylidene has monoanionic bidendate nature and coordinate with metal ions through nitrogen atom of azomethine (>C = N) and deprotonated -NH group. All the complexes were assigned octahedral geometry on the basis of magnetic moment and electronic spectroscopic data. Low value of conductance supports their non-electrolytic nature. The ligand, as well as its complexes were checked for their in vitro antimicrobial activities against two gram positive bacterial strains, Bacillus subtillus. Staphylococcus aureus and one gram negative Salmonella typhae and five fungal strains, Nigrospora oryzae, Curvularia lunata, Drechslera rostrata, Aspergillus niger and Candida olbicans by disc diffusion method and agar plate technique, respectively. Both the antibacterial and antitungal activities of the synthesized metal complexes were found to be more as compared to parent drug and uncomplexed ligand. All the complexes contain coordinated water, which is lost at 141-160 degree C. (author)

Mutation and biochemical analysis in carnitine palmitoyltransferase type II (CPT II) deficiency

DEFF Research Database (Denmark)

Olpin, S E; Afifi, A; Clark, S

2003-01-01

Carnitine palmitoyltransferase type II (CPT II) deficiency has three basic phenotypes, late-onset muscular (mild), infantile/juvenile hepatic (intermediate) and severe neonatal. We have measured fatty acid oxidation and CPT II activity and performed mutation studies in 24 symptomatic patients...

Elizabeth II uus kunstigalerii

Index Scriptorium Estoniae

1999-01-01

Tähistamaks oma troonile asumise 50. aastapäeva, avab Elizabeth II 6. II 2002 Buckinghami palees uue kunstigalerii, mis ehitatakse palee tiibhoonena. Arhitekt John Simpson. Elizabeth II kunstikogust

Electrochemical, spectroscopic, and photophysical properties of structurally diverse polyazine-bridged Ru(II),Pt(II) and Os(II),Ru(II),Pt(II) supramolecular motifs.

Science.gov (United States)

Knoll, Jessica D; Arachchige, Shamindri M; Wang, Guangbin; Rangan, Krishnan; Miao, Ran; Higgins, Samantha L H; Okyere, Benjamin; Zhao, Meihua; Croasdale, Paul; Magruder, Katherine; Sinclair, Brian; Wall, Candace; Brewer, Karen J

2011-09-19

Five new tetrametallic supramolecules of the motif [{(TL)(2)M(dpp)}(2)Ru(BL)PtCl(2)](6+) and three new trimetallic light absorbers [{(TL)(2)M(dpp)}(2)Ru(BL)](6+) (TL = bpy = 2,2'-bipyridine or phen = 1,10-phenanthroline; M = Ru(II) or Os(II); BL = dpp = 2,3-bis(2-pyridyl)pyrazine, dpq = 2,3-bis(2-pyridyl)quinoxaline, or bpm = 2,2'-bipyrimidine) were synthesized and their redox, spectroscopic, and photophysical properties investigated. The tetrametallic complexes couple a Pt(II)-based reactive metal center to Ru and/or Os light absorbers through two different polyazine BL to provide structural diversity and interesting resultant properties. The redox potential of the M(II/III) couple is modulated by M variation, with the terminal Ru(II/III) occurring at 1.58-1.61 V and terminal Os(II/III) couples at 1.07-1.18 V versus Ag/AgCl. [{(TL)(2)M(dpp)}(2)Ru(BL)](PF(6))(6) display terminal M(dπ)-based highest occupied molecular orbitals (HOMOs) with the dpp(π*)-based lowest unoccupied molecular orbital (LUMO) energy relatively unaffected by the nature of BL. The coupling of Pt to the BL results in orbital inversion with localization of the LUMO on the remote BL in the tetrametallic complexes, providing a lowest energy charge separated (CS) state with an oxidized terminal Ru or Os and spatially separated reduced BL. The complexes [{(TL)(2)M(dpp)}(2)Ru(BL)](6+) and [{(TL)(2)M(dpp)}(2)Ru(BL)PtCl(2)](6+) efficiently absorb light throughout the UV and visible regions with intense metal-to-ligand charge transfer (MLCT) transitions in the visible at about 540 nm (M = Ru) and 560 nm (M = Os) (ε ≈ 33,000-42,000 M(-1) cm(-1)) and direct excitation to the spin-forbidden (3)MLCT excited state in the Os complexes about 720 nm. All the trimetallic and tetrametallic Ru-based supramolecular systems emit from the terminal Ru(dπ)→dpp(π*) (3)MLCT state, λ(max)(em) ≈ 750 nm. The tetrametallic systems display complex excited state dynamics with quenching of the (3)MLCT emission at

Synthesis, characterization and polymerization of methacrylates of copper (II), cobalt (II) and molybdenum (II). Generation of new materials

International Nuclear Information System (INIS)

Rojas Bolanos, Omar

2006-01-01

Coordination compounds of the species copper (II), cobalt (II) and molybdenum (II) with methacrylic acid were synthesized and characterized. Besides, it realized reactions of bromine addition to the doubles links of the species obtained previously, also too like reactions with dry HCl. Finally, it got hybrids materials by polymerization of the first compounds in an acrylic matrix. Research concluded with the characterization of all the products. (author) [es

Synthesis of amino functionalized magnetic graphenes composite material and its application to remove Cr(VI), Pb(II), Hg(II), Cd(II) and Ni(II) from contaminated water

International Nuclear Information System (INIS)

Guo, Xiaoyao; Du, Bin; Wei, Qin; Yang, Jian; Hu, Lihua; Yan, Liangguo; Xu, Weiying

2014-01-01

Highlights: • Graphenes magnetic composite nanoparticles (Fe 3 O 4 -GS) were used to adsorb metal ions. • The adsorption of metal ions onto Fe 3 O 4 -GS could be well interpreted by the Freundlich equation. • The adsorption of metal ions onto Fe 3 O 4 -GS fit pseudo-second order kinetic model. • Thermodynamic studies illustrated that the adsorption process was endothermic and spontaneous in nature. - Abstract: In the present study, a kind of graphenes magnetic material (Fe 3 O 4 -GS) was prepared by compositing graphene sheet with ferroferric oxide, and shown to be effictive for removing Cr(VI), Pb(II), Hg(II), Cd(II) and Ni(II) ions from aqueous solution. The synthesized sorbent was characterized by SEM, TEM, FTIR, XRD, XPS and BET, respectively. The pH ZPC value of the sorbent was estimated to be 3.5 by alkaline-titration methods. Fe 3 O 4 -GS can be simply recovered from water with magnetic separation at low magnetic field within one minute. The sorption capacities of the metals were 17.29, 27.95, 23.03, 27.83 and 22.07 mg g −1 for Cr(VI), Pb(II), Hg(II), Cd(II) and Ni(II), respectively. Kinetic data showed good correlation with pseudo-second-order equation and the Freundlich model was found to fit for the isotherm data of all the heavy metal ions. It was found that the metals sorption was accomplished mainly via chelation or ion exchange. The results of thermodynamic studies illustrate that the adsorption process was endothermic and spontaneous in nature

Caracterización de la ganadería de doble propósito en una región de Chiapas, México / Characterization of dual purpose livestock in a Region of Chiapas Mexico

Directory of Open Access Journals (Sweden)

Miguel Ángel Orantes-Zebadúa

2014-01-01

Full Text Available El objetivo del estudio fue caracterizar el sistema de ganado bovino de Doble Propósito (DP de la región 01 Centro de Chiapas, México y los factores socioeconómicos, tecnológicos y comerciales que limitan la producción. El estudio se desarrollo de octubre de 2007 a mayo de 2008. Se aplicó una encuesta aleatoria de 246 productores de una población de 1240 productores, correspondientes a nueve municipios de los 22 que conforma la región 01 Centro de Chiapas. Se analizaron variables cuantitativas, calculando medias aritméticas y porcentajes. En las variables cualitativas se realizaron tablas de frecuencias. Los datos fueron analizados utilizando el paquete estadístico Statistic® 6.0. Los resultados del estudio mostraron que la edad promedio de los productores fue de 50 años y con nivel de estudio de sexto de primaria promedio, 62 % son pequeños propietarios con un promedio de 26 ha y los ejidatarios representan solo 38 % con un promedio de 10 ha. La genética de los hatos está formada de ganado cebú/suizo (63 %, el ingreso económico es la ordeña (67 %, con producción promedio diario del hato de 54 I y el precio de venta del litro de leche a $2.62. Así mismo, 61 % de los productores realizan la comercialización de ganado y leche en el rancho. Aún no existe la organización empresarial y no han innovado tecnología para mejorar los procesos de comercialización.

Removal of Pb(II), Cu(II) and Cd(II) from aqueous solution by some fungi and natural adsorbents in single and multiple metal systems

International Nuclear Information System (INIS)

Shoaib, A.; Badar, T.; Aslam, N.

2011-01-01

Six fungal and 10 natural biosorbents were analyzed for their Cu(II), Cd(II) and Pb(II) uptake capacity from single, binary and ternary metal ion system. Preliminary screening biosorption of assays revealed 2 fungi (Aspergillus niger and Cunninghamella echinulata) and three natural [Cicer arietinum husk, Moringa oleifera flower and soil (clay)] adsorbents hold considerable high adsorption efficiency and capacity for 3 meta l ions amongst the adsorbents. Further biosorption trials with five elected adsorbents showed a considerable reduction in metal uptake capability of adsorbents in binary- and ternary systems as compared to singly metal system. Cd(II) manifested the highest inhibitory effect on the biosorption of other metal ions, followed by Pb(II) and Cu(II). On account of metal preference, the selectivity order for metal ion towards the studied biomass matrices was Pb(II) (40-90%) > Cd(II) (2-53%) > Cu(II) (2-30%). (author)

Syntheses and spectroscopic properties of mercury(II) and nickel(II ...

African Journals Online (AJOL)

Syntheses and spectroscopic properties of mercury(II) and nickel(II) ... The complexes were characterized by IR, diffuse reflectance, 1H NMR spectra and elemental ... coordinating through thiolato sulphur and hydrazinic nitrogen atoms.

Low-temperature Synthesis of Tin(II) Oxide From Tin(II) ketoacidoximate Precursor

KAUST Repository

Alshankiti, Buthainah

2015-01-01

Sn (II) oxide finds numerous applications in different fields such as thin film transistors1, solar cells2 and sensors.3 In this study we present the fabrication of tin monoxide SnO by using Sn (II) ketoacid oximate complexes as precursors. Tin (II

Biosorption optimization of lead(II), cadmium(II) and copper(II) using response surface methodology and applicability in isotherms and thermodynamics modeling

International Nuclear Information System (INIS)

Singh, Rajesh; Chadetrik, Rout; Kumar, Rajender; Bishnoi, Kiran; Bhatia, Divya; Kumar, Anil; Bishnoi, Narsi R.; Singh, Namita

2010-01-01

The present study was carried out to optimize the various environmental conditions for biosorption of Pb(II), Cd(II) and Cu(II) by investigating as a function of the initial metal ion concentration, temperature, biosorbent loading and pH using Trichoderma viride as adsorbent. Biosorption of ions from aqueous solution was optimized in a batch system using response surface methodology. The values of R 2 0.9716, 0.9699 and 0.9982 for Pb(II), Cd(II) and Cu(II) ions, respectively, indicated the validity of the model. The thermodynamic properties ΔG o , ΔH o , ΔE o and ΔS o by the metal ions for biosorption were analyzed using the equilibrium constant value obtained from experimental data at different temperatures. The results showed that biosorption of Pb(II) ions by T. viride adsorbent is more endothermic and spontaneous. The study was attempted to offer a better understating of representative biosorption isotherms and thermodynamics with special focuses on binding mechanism for biosorption using the FTIR spectroscopy.

Biosorption optimization of lead(II), cadmium(II) and copper(II) using response surface methodology and applicability in isotherms and thermodynamics modeling

Energy Technology Data Exchange (ETDEWEB)

Singh, Rajesh; Chadetrik, Rout; Kumar, Rajender; Bishnoi, Kiran; Bhatia, Divya; Kumar, Anil [Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana (India); Bishnoi, Narsi R., E-mail: nrbishnoi@gmail.com [Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana (India); Singh, Namita [Department of Bio and Nanotechnology, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana (India)

2010-02-15

The present study was carried out to optimize the various environmental conditions for biosorption of Pb(II), Cd(II) and Cu(II) by investigating as a function of the initial metal ion concentration, temperature, biosorbent loading and pH using Trichoderma viride as adsorbent. Biosorption of ions from aqueous solution was optimized in a batch system using response surface methodology. The values of R{sup 2} 0.9716, 0.9699 and 0.9982 for Pb(II), Cd(II) and Cu(II) ions, respectively, indicated the validity of the model. The thermodynamic properties {Delta}G{sup o}, {Delta}H{sup o}, {Delta}E{sup o} and {Delta}S{sup o} by the metal ions for biosorption were analyzed using the equilibrium constant value obtained from experimental data at different temperatures. The results showed that biosorption of Pb(II) ions by T. viride adsorbent is more endothermic and spontaneous. The study was attempted to offer a better understating of representative biosorption isotherms and thermodynamics with special focuses on binding mechanism for biosorption using the FTIR spectroscopy.

Iodine capture by Hofmann-type clathrate Ni(II)(pz)[Ni(II)(CN)_4

International Nuclear Information System (INIS)

Massasso, Giovanni; Long, Jerome; Haines, Julien; Devautour-Vinot, Sabine; Maurin, Guillaume; Larionova, Joulia; Guerin, Christian; Guari, Yannick; Grandjean, Agnes; Onida, Barbara; Donnadieu, Bruno

2014-01-01

The thermally stable Hofmann-type clathrate framework Ni(II)(pz)[Ni(II)(CN)_4] (pz = pyrazine) was investigated for the efficient and reversible sorption of iodine (I_2) in the gaseous phase and in solution with a maximum adsorption capacity of 1 mol of I_2 per 1 mol of Ni(II)pz)[Ni(II)(CN)_4] in solution. (authors)

Adsorption characteristics of Pb(II) and Cu(II) ions by domestic clays

International Nuclear Information System (INIS)

Kwon, Ee Yol; Noh, Hea Ran

1990-01-01

This investigation was carried out to study the adsorption characteristics of Pb(II) and Cu(II) ions in aqueous solution by using clays of Gampo 35, Bentonite (chulwon) and Mangwoon 95 which were dug in the country. As the results, the adsorption of metal ions clays were reached equilibrium by shaking for about 40-60 minutes. In acidic solution, the adsorptivity of clays was increased as pH increased, however, Gampo 35 showed the high adsorptivity over 90% even at pH2-3. Pb(II) ion showed better removal efficiency than Cu(II) ion. The adsorptivities of adsorbents showed following order: Gampo 35>Bentonite> Mangwoon 95. The adsorption isotherms of Pb(II) ion on clays were well fitted in Freundlich's equation. Freundlich constantstion isotherms of Pb(II) ion on clays were well fitted in Freundlich's equation. Freundlich constants (1/n) of Gampo 35, Bentonite and Mangwoon 95 were 0.195, 0.271 and 0.314, respectively.(Author)

The Formation of Metal (M=Co(II), Ni(II), and Cu(II)) Complexes by Aminosilanes Immobilized within Mesoporous Molecular Sieves

International Nuclear Information System (INIS)

Park, Dong Ho; Park, Sung Soo; Choe, Sang Joon

1999-01-01

The immobilization of APTMS(3-(2-aminoethylamino)propyltrimethoxysilane) and AAPTMS(3-(2-(2-aminoethyl) aminoethylamino)propyltrimethoxysilane) on the surface of high quality mesoporous molecular sieves MCM-41 and MCM-48 have been confirmed by F.T.-IR spectroscopy, Raman spectroscopy, 29 Si solid state NMR, and a surface polarity measurement using Reichardt's dye. The formation of metal (Co(II), Ni(II), and Cu(II)) complexes by immobilized aminosilanes have been investigated by photoacoustic spectroscopy(PAS). The assignment of UV-Vis. PAS bands makes it possible to identify the structure of metal complexes within mesoporous molecular sieves. Co(II) ion may be coordinated mainly in a tetrahedral symmetry by two APTMS onto MCM-41, and in an octahedral one by two AAPTMS. Both Ni(II) and Cu(II) coordinated by aminosilanes within MCM-41 form possibly the octahedral complexes such as [Ni(APTMS) 2 (H 2 O) 2 ] 2+ , [Ni(AAPTMS) 2 ] 2+ , [Cu(APTMS) 2 (H 2 O) 2 ] 2+ , and [Cu(AAPTMS)(H 2 O) 3 ] 2+ , respectively. The PAS band shapes of complexes onto MCM-48 are similar to those of corresponding MCM-41 with the variation of PAS intensity. Most of metal ion(II) within MCM-41 and MCM-48 are coordinated by aminosilanes without the impregnation on the surface

Intrafibrillar Mineral May be Absent in Dentinogenesis Imperfecta Type II (DI-II); TOPICAL

International Nuclear Information System (INIS)

Pople, John A.

2001-01-01

High-resolution synchrotron radiation computed tomography (SRCT) and small angle x-ray scattering (SAXS) were performed on normal and dentinogenesis imperfecta type II (DI-II) teeth. Three normal and three DI-II human third molars were used in this study. The normal molars were unerupted and had intact enamel; donors were female and ranged in age from 18-21y. The DI-II specimens, which were also unerupted with intact enamel, came from a single female donor age 20y. SRCT showed that the mineral concentration was 33% lower on average in the DI-II dentin with respect to normal dentin. The SAXS spectra from normal dentin exhibited low-angle diffraction peaks at harmonics of 67.6 nm, consistent with nucleation and growth of the apatite phase within gaps in the collagen fibrils (intrafibrillar mineralization). In contrast, the low-angle peaks were almost nonexistent in the DI-II dentin. Crystallite thickness was independent of location in both DI-II and normal dentin, although the crystallites were significantly thicker in DI-II dentin (6.8 nm (s.d.= 0.5) vs 5.1 nm (s.d.= 0.6)). The shape factor of the crystallites, as determined by SAXS, showed a continuous progression in normal dentin from roughly one-dimensional (needle-like) near the pulp to two-dimensional (plate-like) near the dentin-enamel junction. The crystallites in DI-II dentin, on the other hand, remained needle-like throughout. The above observations are consistent with an absence of intrafibrillar mineral in DI-II dentin

Adsorption of Cs(I), Sr(II), Eu(III), Co(II) and Cd(II) by Al2O3

International Nuclear Information System (INIS)

Shiao, S.Y.; Egozy, Y.; Meyer, R.E.

1981-01-01

Adsorption of Cs(I), Sr(II), Eu(III), Co(II) and Cd(II) by Al 2 O 3 was carried out over a wide range of NaCl concentration and solution pH. In the medium pH region (pH 5 to 9), adsorption depends strongly on pH and less on salt concentration. However, in the high pH region (pH above 9), the salt dependence of the distribution coefficient becomes important. (author)

Synthesis, Characterization and Antimicrobial Activity of Cu(II, Co(II and Ni(II Complexes with O, N, and S Donor Ligands

Directory of Open Access Journals (Sweden)

Vidyavati Reddy

2008-01-01

Full Text Available The complexes of the type ML2 [where M = Cu(II, Co(II, and Ni(II] L = 1-phenyl-1-ene-3-(2-hydroxyphenyl-prop-2-ene with 3- substituted-5-mercapto-4-amino-1,2,4-triazoles. Schiff base ligands have been prepared by reacting 3-(2-hydroxyphenyl-1-phenylprop-2-en-1-one and 3-phenyl/pyridyl-4-amino-5-mercapto-1,2,4-triazoles in an alcoholic medium. The complexes are non-electrolytes in DMF. The resulting complexes were characterized by elemental analysis, magnetic measurements, conductivity measurements and spectral studies. The Schiff base acts as a tridentate dibasic and coordinating through the deprotonated oxygen, thioenolic sulphur and azomethine nitrogen atoms. It is found that Cu(II, Co(II, and Ni(II complexes exhibited octahedral geometry. The antimicrobial activities of ligands and its complexes were screened by cup plate method.

Shark class II invariant chain reveals ancient conserved relationships with cathepsins and MHC class II.

Science.gov (United States)

Criscitiello, Michael F; Ohta, Yuko; Graham, Matthew D; Eubanks, Jeannine O; Chen, Patricia L; Flajnik, Martin F

2012-03-01

The invariant chain (Ii) is the critical third chain required for the MHC class II heterodimer to be properly guided through the cell, loaded with peptide, and expressed on the surface of antigen presenting cells. Here, we report the isolation of the nurse shark Ii gene, and the comparative analysis of Ii splice variants, expression, genomic organization, predicted structure, and function throughout vertebrate evolution. Alternative splicing to yield Ii with and without the putative protease-protective, thyroglobulin-like domain is as ancient as the MHC-based adaptive immune system, as our analyses in shark and lizard further show conservation of this mechanism in all vertebrate classes except bony fish. Remarkable coordinate expression of Ii and class II was found in shark tissues. Conserved Ii residues and cathepsin L orthologs suggest their long co-evolution in the antigen presentation pathway, and genomic analyses suggest 450 million years of conserved Ii exon/intron structure. Other than an extended linker preceding the thyroglobulin-like domain in cartilaginous fish, the Ii gene and protein are predicted to have largely similar physiology from shark to man. Duplicated Ii genes found only in teleosts appear to have become sub-functionalized, as one form is predicted to play the same role as that mediated by Ii mRNA alternative splicing in all other vertebrate classes. No Ii homologs or potential ancestors of any of the functional Ii domains were found in the jawless fish or lower chordates. Copyright © 2011 Elsevier Ltd. All rights reserved.

COMPOSITIONS BASED ON PALLADIUM(II AND COPPER(II COMPOUNDS, HALIDE IONS, AND BENTONITE FOR OZONE DECOMPOSITION

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T. L. Rakitskaya

2017-05-01

bromide ion. For Cu(II-KBr/N-Bent composition, kinetic and calculation data show that, in the presence of bromide ions, copper(II inhibits the ozone decomposition. For Pd(II-KBr/NBent composition, it has been found that the maximum activity is attained at СPd(II = 1.02·10-5 mol/g. For bimetallic Pd(II- Cu(II-KBr/N-Bent composition, changes in τ0, τ1/2, k1/2, and Q1/2 parameters depending on a Pd(II content are similar to those for monometallic Pd(II-KBr/NBent composition; however, values of the parameters are higher for the monometallic system. Thus, the inhibiting effect of Cu(II is observed even in the presence of palladium(II.

La Contabilità pratica prima di Luca Pacioli: Origine della Partita Doppia

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Carlo Antinori

2006-12-01

El trabajo prosigue con un estudio comparativo de las prácticas contables previas a la publicación del Tractatus XI de Luca Pacioli, contenido en su Summa de Arithmetica, seguidas en las principales regiones italianas: Venecia y sus territorios, Milán y la Lombardía, Génova y la Liguria, la Emilia-Romaña y la Toscana. Se describen las particularidades de los distintos tipos de contabilidad surgidos en cada una de estas regiones, señalando las similitudes y diferencias entre cada uno de ellos, así como sus respectivas aproximaciones a la partida doble. El artículo se detiene especialmente en la asignación que Federico Melis hace en exclusiva a la Toscana como descubridora de la contabilidad por partida doble. A estos efectos, estudia las características que Luca Pacioli atribuye a este método contable, por considerar que las mismas constituyen el paradigma de la partida doble. Luego se pasa revista a las diferencias existentes entre el modelo pacioliano y el propuesto por Federico Melis, diferencias que se considera son debidas a un excesivo provincianismo de este autor, empeñado en atribuir a la Toscana la paternidad de la contabilidad por partida doble, cuando en realidad parece que este método fue desarrollado casi simultáneamente en diversas regiones italianas.

Evolved H II regions

International Nuclear Information System (INIS)

Churchwell, E.

1975-01-01

A probable evolutionary sequence of H II regions based on six distinct types of observed objects is suggested. Two examples which may deviate from this idealized sequence, are discussed. Even though a size-mean density relation of H II regions can be used as a rough indication of whether a nebula is very young or evolved, it is argued that such a relation is not likely to be useful for the quantitative assignment of ages to H II regions. Evolved H II regions appear to fit into one of four structural types: rings, core-halos, smooth structures, and irregular or filamentary structures. Examples of each type are given with their derived physical parameters. The energy balance in these nebulae is considered. The mass of ionized gas in evolved H II regions is in general too large to trace the nebula back to single compact H II regions. Finally, the morphological type of the Galaxy is considered from its H II region content. 2 tables, 2 figs., 29 refs

Biosorption of copper(II) and lead(II) onto potassium hydroxide treated pine cone powder.

Science.gov (United States)

Ofomaja, A E; Naidoo, E B; Modise, S J

2010-08-01

Pine cone powder surface was treated with potassium hydroxide and applied for copper(II) and lead(II) removal from solution. Isotherm experiments and desorption tests were conducted and kinetic analysis was performed with increasing temperatures. As solution pH increased, the biosorption capacity and the change in hydrogen ion concentration in solution increased. The change in hydrogen ion concentration for lead(II) biosorption was slightly higher than for copper(II) biosorption. The results revealed that ion-exchange is the main mechanism for biosorption for both metal ions. The pseudo-first order kinetic model was unable to describe the biosorption process throughout the effective biosorption period while the modified pseudo-first order kinetics gave a better fit but could not predict the experimentally observed equilibrium capacities. The pseudo-second order kinetics gave a better fit to the experimental data over the temperature range from 291 to 347 K and the equilibrium capacity increased from 15.73 to 19.22 mg g(-1) for copper(II) and from 23.74 to 26.27 for lead(II). Activation energy was higher for lead(II) (22.40 kJ mol(-1)) than for copper(II) (20.36 kJ mol(-1)). The free energy of activation was higher for lead(II) than for copper(II) and the values of DeltaH* and DeltaS* indicate that the contribution of reorientation to the activation stage is higher for lead(II) than copper(II). This implies that lead(II) biosorption is more spontaneous than copper(II) biosorption. Equilibrium studies showed that the Langmuir isotherm gave a better fit for the equilibrium data indicating monolayer coverage of the biosorbent surface. There was only a small interaction between metal ions when simultaneously biosorbed and cation competition was higher for the Cu-Pb system than for the Pb-Cu system. Desorption studies and the Dubinin-Radushkevich isotherm and energy parameter, E, also support the ion-exchange mechanism. Copyright 2010 Elsevier Ltd. All rights reserved.

Spectroscopic evaluation of Co(II), Ni(II) and Cu(II) complexes derived from thiosemicarbazone and semicarbazone

Science.gov (United States)

Chandra, Sulekh; Kumar, Anil

2007-12-01

Co(II), Ni(II) and Cu(II) complexes were synthesized with thiosemicarbazone (L 1) and semicarbazone (L 2) derived from 2-acetyl furan. These complexes were characterized by elemental analysis, molar conductance, magnetic moment, mass, IR, electronic and EPR spectral studies. The molar conductance measurement of the complexes in DMSO corresponds to non-electrolytic nature. All the complexes are of high-spin type. On the basis of different spectral studies six coordinated geometry may be assigned for all the complexes except Co(L) 2(SO 4) and Cu(L) 2(SO 4) [where L = L 1 and L 2] which are of five coordinated square pyramidal geometry.

Iodometric determination of peroxydiphosphate in the presence of copper(II) or iron(II) as catalyst.

Science.gov (United States)

Kapoor, S; Sharma, P D; Gupta, Y K

1975-09-01

Peroxydiphosphate can be determined iodometrically in the presence of a large excess of potassium iodide with copper(II) or iron(II) as catalyst through the operation of the Cu(II)/Cu(I) or Fe(II)/Fe(III) cycle. The method is applicable in HClO(4), H(2)SO(4), HCl and CH(3)COOH acid media in the range 0.1-1.0M studied. Nickel, manganese(II), cobalt(II), silver, chloride and phosphate are without effect.

Quininium tetrachloridozinc(II

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Li-Zhuang Chen

2009-10-01

Full Text Available The asymmetric unit of the title compound {systematic name: 2-[hydroxy(6-methoxyquinolin-1-ium-4-ylmethyl]-8-vinylquinuclidin-1-ium tetrachloridozinc(II}, (C20H26N2O2[ZnCl4], consists of a double protonated quininium cation and a tetrachloridozinc(II anion. The ZnII ion is in a slightly distorted tetrahedral coordination environment. The crystal structure is stabilized by intermolecular N—H...Cl and O—H...Cl hydrogen bonds.

Synthesis, characterization and biological studies of 2-(4-nitrophenylamino-carbonyl)benzoic acid and its complexes with Cr(III), Co(II), Ni(II), Cu(II) and Zn(II)

International Nuclear Information System (INIS)

Imran, M; Nazir, S.; Latif, S.; Mahmood, Z.

2010-01-01

Cr(III), Co(II), Ni(II), Cu(II) and Zn(II) complexes of 2-(4-Nitrophenyl aminocarbonyl)benzoic acid were synthesized and characterized on the basis of physical, analytical and spectroscopic data. The ligands, as well as its metal complexes were checked for their in-vitro antimicrobial activity against three bacterial strains, Mycobacterium smegmatis, Escherichia coli, Pseudomonas aeuroginosa, and three fungal strains, Nigrospora oryzae, Aspergillus niger and Candida albicans. Disc diffusion method and Tube diffusion test were used for antibacterial and antifungal activities, respectively. The synthesized complexes only show significant antifungal activity but inactive for antibacterial, however, in general, the metal complexes were found to be more active against antimicrobial activities as compared to their un complexed ligand. (author)

Teleconexiones atmosféricas-oceánicas (océanos Pacífico y Atlántico moduladoras de veranos húmedos y secos en el Núcleo del Monzón de Norte América

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Omar Llanes-Cárdenas

2017-01-01

Full Text Available En décadas recientes, la irregularidad de las precipitaciones ha tenido diversos efectos ambientales y socioeconómicos adversos a nivel mundial. El objetivo de este trabajo fue analizar la resolución de cuatro Modelos Climáticos Regionales (MCR’s forzados por ERA - Interim para capturar los monzones extremos húmedos y secos en el Núcleo del Monzón de Norte América (NMNA, considerando los mecanismos oceánicos del Pacífico y del Atlántico. De las bases de datos disponibles en la red y para el período 1990 - 2008, se obtuvo: (1 promedio de las observaciones (obs media después de haber obtenido 4 conjuntos de datos de precipitación observados: UDel, CLICOM, GPCP y CRU, (2 d el Experimento Regional Coordinado de Reducción de Escala (COR DEX - de Norte América (NA se obtuvieron cuatro MCR’s forzados por ERA - Interim : RegCM4 ( Reg1 y Reg2, HadGEM3 - RA, RCA3.5 y REMO, (3 número e intensidad de los huracanes del Pacífico y (4 cálculo de las anomalías del Jet de Niveles Bajos del Caribe (CLLJ , Varianza Filtrada (VF, Oscilación Decadal del Pacífico (PDO y Oscilación Multidecadal del Atlántico (AMO. Se seleccionaron dos monzones extremos: uno húmedo (1990 y otro seco (2005. Se aplicó una prueba de normalidad de Shapiro Wilk a los datos a es tudiar. Se calculó una correlación de Pearson y una prueba de hipótesis con nivel de confianza de 95 % (P < 0.05 y 99 % (P < 0.01 entre los modelos, Era - Interim, las observaciones y los índices oceánicos. Sin considerar los índices oceánicos, HadGEM3 - RA y ERA - Interim capturan de mejor manera la precipitación en los monzones húmedos, en tanto que ERA - Interim y Reg1 resultaron ser mejores para capturar la precipitación para monzones secos. El monzón de 1990 presentó casi el doble de precipitación que el 200 5. Esta anomalía húmeda al parecer se asocia con la ocurrencia de 16 huracanes cerca del Golfo de California en 1990, lo que contrasta con el 2005, cuando solo se

Enhanced removal of Cd(II) and Pb(II) by composites of mesoporous carbon stabilized alumina

Energy Technology Data Exchange (ETDEWEB)

Yang, Weichun [Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha 410017 (China); Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Lushan South Road 932, Changsha 410017 (China); Tang, Qiongzhi; Wei, Jingmiao; Ran, Yajun [Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha 410017 (China); Chai, Liyuan [Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha 410017 (China); Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Lushan South Road 932, Changsha 410017 (China); Wang, Haiying, E-mail: haiyw25@163.com [Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Lushan South Road 932, Changsha 410017 (China); Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Lushan South Road 932, Changsha 410017 (China)

2016-04-30

Graphical abstract: - Highlights: • Mesoporous carbon stabilized alumina was prepared by one-pot hard-templating method. • MC/Al{sub 2}O{sub 3} showed excellent performance for Cd(II) and Pb(II) adsorption. • Enhanced adsorption was due to the high surface area and special functional groups. - Abstract: A novel adsorbent of mesoporous carbon stabilized alumina (MC/Al{sub 2}O{sub 3}) was synthesized through one-pot hard-templating method. The adsorption potential of MC/Al{sub 2}O{sub 3} for Cd(II) and Pb(II) from aqueous solution was investigated compared with the mesoporous carbon. The results indicated the MC/Al{sub 2}O{sub 3} showed excellent performance for Cd(II) and Pb(II) removal, the adsorption capacity reached 49.98 mg g{sup −1} for Cd(II) with initial concentration of 50 mg L{sup −1} and reached 235.57 mg g{sup −1} for Pb(II) with initial concentration of 250 mg L{sup −1}, respectively. The kinetics data of Cd(II) adsorption demonstrated that the Cd(II) adsorption rate was fast, and the removal efficiencies with initial concentration of 10 and 50 mg L{sup −1} can reach up 99% within 5 and 20 min, respectively. The pseudo-second-order kinetic model could describe the kinetics of Cd(II) adsorption well, indicating the chemical reaction was the rate-controlling step. The mechanism for Cd(II) and Pb(II) adsorption by MC/Al{sub 2}O{sub 3} was investigated by X-ray photoelectron spectroscopy (XPS) and Fourier transformed infrared spectroscopy (FTIR), and the results indicated that the excellent performance for Cd(II) and Pb(II) adsorption of MC/Al{sub 2}O{sub 3} was mainly attributed to its high surface area and the special functional groups of hydroxy-aluminum, hydroxyl, carboxylic through the formation of strong surface complexation or ion-exchange. It was concluded that MC/Al{sub 2}O{sub 3} can be recognized as an effective adsorbent for removal of Cd(II) and Pb(II) in aqueous solution.

Gimnasio doble, en Giessen – Alemania

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Novotny - Mähner, -

1967-12-01

Full Text Available This gymnasium occupies a ground area of 30 x 30 m, and it comprises two gymnasium halls, with folding partitions, which make it easy to convert them into a single large hall, if necessary. There are also the usual dressing rooms, showers and various other services. A stand, with capacity for 400 spectators, is an important additional feature. But the most outstanding aspect of this project is the structure and roof, which is highly novel, both constructionally and architecturally.Construido sobre una superficie de 30 x 30 m, el edificio alberga: dos salas de gimnasia —con una compartimentación plegable, que hace factible el convertirlas en una gran sala en caso necesario—; los vestuarios; duchas; etc. Hay una tribuna con capacidad para 400 espectadores; pero, en esta edificación, hay que destacar la solución adoptada para su estructura y cubierta por la novedad que presenta, tanto desde el punto de vista constructivo como formal.

Labio doble: Caso clínico y revisión de la literatura Lábio duplo: relato de caso e revisão da literatura Double lip: Report of a case and review of the literature

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P. Olímpio Aguiar

2011-06-01

Full Text Available El labido doble es una anomalía rara que se caracteriza por una redundancia de la mucosa labial visible al abrir la boca o al sonreir. Afecta con mayor frecuencia al labio superior. Su tratamiento es quirúrgico, para lo cual están descritas diversas técnicas. En la paciente que presentamos se realizaron resecciones elípticas de la mucosa y del tejido submucoso combinadas con una z-plastia vertical en la parte central del labio superior. Los resultados estéticos y funcionales de nuestro caso fueron satisfactorios.Lábio duplo é uma anomalia rara caracterizada por uma redundância de mucosa labial visível à abertura bucal ou ao sorriso. Ocorre com maior freqüência no lábio superior. O tratamento é cirúrgico sendo descritas algumas técnicas para sua correção. Na paciente apresentada foram realizadas ressecções elípticas de mucosa e tecido submucoso combinadas a uma z-plastia vertical na parte central do lábio superior. Os resultados estético e funcional foram satisfactórios.Double lip is a rare anomaly characterized by a redundancy of labial mucosa visible during mouth opening or during smiling. It occurs more frequently in the upper lip. The treatment is surgical and there are many techniques for its correction. In our clinical case we used an elliptical excision of mucosal and submucosal tissue combined with a vertical midline z-plasty of the upper lip. Satisfactory aesthetic result was achived.

Simultaneous Determination of Cobalt (II and Nickel (II By First Order Derivative Spectrophotometry in Micellar Media

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Rajni Rohilla

2012-01-01

Full Text Available A first-derivative spectrophotometry method for the simultaneous determination of Co (II and Ni (II with Alizarin Red S in presence of Triton X-100 is described. Measurements were made at the zero-crossing wavelengths at 549.0 nm for Co (II and 546.0 nm for Ni (II. The linearity is obtained in the range of 0.291- 4.676 μg/ml of Ni (II and 0.293- 4.124 μg/ml of Co (II in the presence of each other by using first derivative spectrophotometric method. The possible interfering effects of various ions were studied. The validity of the method was examined by using synthetic mixtures of Co (II and Ni (II. The developed derivative procedure, using the zero crossing technique, has been successfully applied for the simultaneous analysis of Co (II and Ni (II in spiked water samples.

Synthesis and Characterization of Cu(II), Co(II) and Ni(II) Complexes of Trithiocyanuric Acid: The Structure of {N,N'-Bis(3-Aminopropyl)-1,3-Propanediamine}-(Trithiocyanurato)Nickel(II)

Czech Academy of Sciences Publication Activity Database

Kopel, P.; Trávníček, Zdeněk; Kvítek, L.; Černošek, Z.; Wrzeszcz, G.; Marek, J.

2003-01-01

Roč. 56, č. 1 (2003), s. 1-11 ISSN 0095-8972 R&D Projects: GA ČR GA203/00/0152; GA AV ČR IBS5038351 Institutional research plan: CEZ:AV0Z5038910 Keywords : Copper(II) * cobalt(II) and nickel(II) complexes * Trithiocyanuric acid Subject RIV: CE - Biochemistry Impact factor: 0.841, year: 2003

Antimicrobial and mutagenic activity of some carbono- and thiocarbonohydrazone ligands and their copper(II), iron(II) and zinc(II) complexes.

Science.gov (United States)

Bacchi, A; Carcelli, M; Pelagatti, P; Pelizzi, C; Pelizzi, G; Zani, F

1999-06-15

Several mono- and bis- carbono- and thiocarbonohydrazone ligands have been synthesised and characterised; the X-ray diffraction analysis of bis(phenyl 2-pyridyl ketone) thiocarbonohydrazone is reported. The coordinating properties of the ligands have been studied towards Cu(II), Fe(II), and Zn(II) salts. The ligands and the metal complexes were tested in vitro against Gram positive and Gram negative bacteria, yeasts and moulds. In general, the bisthiocarbonohydrazones possess the best antimicrobial properties and Gram positive bacteria are the most sensitive microorganisms. Bis(ethyl 2-pyridyl ketone) thiocarbonohydrazone, bis(butyl 2-pyridyl ketone)thiocarbonohydrazone and Cu(H2nft)Cl2 (H2nft, bis(5-nitrofuraldehyde)thiocarbonohydrazone) reveal a strong activity with minimum inhibitory concentrations of 0.7 microgram ml-1 against Bacillus subtilis and of 3 micrograms ml-1 against Staphylococcus aureus. Cu(II) complexes are more effective than Fe(II) and Zn(II) ones. All bisthiocarbono- and carbonohydrazones are devoid of mutagenic properties, with the exception of the compounds derived from 5-nitrofuraldehyde. On the contrary a weak mutagenicity, that disappears in the copper complexes, is exhibited by monosubstituted thiocarbonohydrazones.

Chemically modified activated carbon with 1-acylthiosemicarbazide for selective solid-phase extraction and preconcentration of trace Cu(II), Hg(II) and Pb(II) from water samples.

Science.gov (United States)

Gao, Ru; Hu, Zheng; Chang, Xijun; He, Qun; Zhang, Lijun; Tu, Zhifeng; Shi, Jianping

2009-12-15

A new sorbent 1-acylthiosemicarbazide-modified activated carbon (AC-ATSC) was prepared as a solid-phase extractant and applied for removing of trace Cu(II), Hg(II) and Pb(II) prior to their determination by inductively coupled plasma optical emission spectrometry (ICP-OES). The separation/preconcentration conditions of analytes were investigated, including effects of pH, the shaking time, the sample flow rate and volume, the elution condition and the interfering ions. At pH 3, the maximum static adsorption capacity of Cu(II), Hg(II) and Pb(II) onto the AC-ATSC were 78.20, 67.80 and 48.56 mg g(-1), respectively. The adsorbed metal ions were quantitatively eluted by 3.0 mL of 2% CS(NH2)2 and 2.0 mol L(-1) HCl solution. Common coexisting ions did not interfere with the separation. According to the definition of IUPAC, the detection limits (3sigma) of this method for Cu(II), Hg(II) and Pb(II) were 0.20, 0.12 and 0.45 ng mL(-1), respectively. The relative standard deviation under optimum conditions is less than 4.0% (n=8). The prepared sorbent was applied for the preconcentration of trace Cu(II), Hg(II) and Pb(II) in certified and water samples with satisfactory results.

Identification and Characterization of Novel Immunomodulatory Bursal-derived Pentapeptide-II (BPP-II)*

Science.gov (United States)

Feng, Xiu-Li; Liu, Qing-Tao; Cao, Rui-Bing; Zhou, Bin; Ma, Zhi-Yong; Deng, Wen-Lei; Wei, Jian-Chao; Qiu, Ya-Feng; Wang, Fang-Quan; Gu, Jin-Yan; Wang, Feng-Juan; Zheng, Qi-Sheng; Ishag, Hassan; Chen, Pu-Yan

2012-01-01

The bursa of Fabricius, the acknowledged central humoral immune organ, plays a vital role in B lymphocyte differentiation. However, there are few reports of the molecular basis of the mechanism on immune induction and potential antitumor activity of bursal-derived peptides. In this paper, a novel bursal-derived pentapeptide-II (BPP-II, MTLTG) was isolated and exerted immunomodulatory functions on antibody responses in vitro. Gene microarray analyses demonstrated that BPP-II regulated expression of 2478 genes in a mouse-derived hybridoma cell line. Immune-related gene ontology functional procedures were employed for further functional analysis. Furthermore, the majority of BPP-II-regulated pathways were associated with immune responses and tumor processes. Moreover, BPP-II exhibited immunomodulatory effects on antigen-specific immune responses in vivo, including enhancement of avian influenza virus (H9N2 subtype)-specific antibody and cytokine production and modification of T cell immunophenotypes and lymphocyte proliferation. Finally, BPP-II triggered p53 expression and stabilization and selectively inhibited tumor cell proliferation. These data identified the multifunctional factor, BPP-II, as a novel biomaterial representing an important linking between the humoral central immune system and immune induction, including antitumor. Information generated in this study elucidates further the mechanisms involved in humoral immune system and represents the potential basis of effective immunotherapeutic strategies for treating human tumors and immune improvement. PMID:22184121

Identification and characterization of novel immunomodulatory bursal-derived pentapeptide-II (BPP-II).

Science.gov (United States)

Feng, Xiu-Li; Liu, Qing-Tao; Cao, Rui-Bing; Zhou, Bin; Ma, Zhi-Yong; Deng, Wen-Lei; Wei, Jian-Chao; Qiu, Ya-Feng; Wang, Fang-Quan; Gu, Jin-Yan; Wang, Feng-Juan; Zheng, Qi-Sheng; Ishag, Hassan; Chen, Pu-Yan

2012-02-03

The bursa of Fabricius, the acknowledged central humoral immune organ, plays a vital role in B lymphocyte differentiation. However, there are few reports of the molecular basis of the mechanism on immune induction and potential antitumor activity of bursal-derived peptides. In this paper, a novel bursal-derived pentapeptide-II (BPP-II, MTLTG) was isolated and exerted immunomodulatory functions on antibody responses in vitro. Gene microarray analyses demonstrated that BPP-II regulated expression of 2478 genes in a mouse-derived hybridoma cell line. Immune-related gene ontology functional procedures were employed for further functional analysis. Furthermore, the majority of BPP-II-regulated pathways were associated with immune responses and tumor processes. Moreover, BPP-II exhibited immunomodulatory effects on antigen-specific immune responses in vivo, including enhancement of avian influenza virus (H9N2 subtype)-specific antibody and cytokine production and modification of T cell immunophenotypes and lymphocyte proliferation. Finally, BPP-II triggered p53 expression and stabilization and selectively inhibited tumor cell proliferation. These data identified the multifunctional factor, BPP-II, as a novel biomaterial representing an important linking between the humoral central immune system and immune induction, including antitumor. Information generated in this study elucidates further the mechanisms involved in humoral immune system and represents the potential basis of effective immunotherapeutic strategies for treating human tumors and immune improvement.

Removal of Ni(II), Zn(II) and Pb(II) ions from single metal aqueous solution using rice husk-based activated carbon

Energy Technology Data Exchange (ETDEWEB)

Taha, Mohd F., E-mail: faisalt@petronas.com.my; Shaharun, Maizatul S. [Fundamental and Applied Sciences Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750, Perak Darul Ridzuan (Malaysia); Shuib, Anis Suhaila, E-mail: anisuha@petronas.com.my; Borhan, Azry [Chemical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750, Perak Darul Ridzuan (Malaysia)

2014-10-24

An attempt was made to investigate the potential of rice husk-based activated carbon as an alternative low-cost adsorbent for the removal of Ni(II), Zn(II) and Pb(II) ions from single aqueous solution. Rice husk-based activated carbon was prepared via treatment of rice husk with NaOH followed by the carbonization process at 400°C for 2 hours. Three samples, i.e. raw rice husk, rice husk treated with NaOH and rice husk-based activated carbon, were analyzed for their morphological characteristics using field-emission scanning electron microscope/energy dispersive X-ray (FESEM/EDX). These samples were also analyzed for their carbon, hydrogen, nitrogen, oxygen and silica contents using CHN elemental analyzer and FESEM/EDX. The porous properties of rice husk-based activated carbon were determined by Brunauer-Emmett-Teller (BET) surface area analyzer, and its surface area and pore volume were 255 m{sup 2}/g and 0.17 cm{sup 2}/g, respectively. The adsorption studies for the removal of Ni(II), Zn(II) and Pb(II) ions from single metal aqueous solution were carried out at a fixed initial concentration of metal ion (150 ppm) with variation amount of adsorbent (rice husk-based activated carbon) as a function of varied contact time at room temperature. The concentration of each metal ion was analyzed using atomic absorption spectrophotometer (AAS). The results obtained from adsorption studies indicate the potential of rice husk as an economically promising precursor for the preparation of activated carbon for removal of Ni(II), Zn(II) and Pb(II) ions from single aqueous solution. Isotherm and kinetic model analyses suggested that the experimental data of adsorption studies fitted well with Langmuir, Freundlich and second-order kinetic models.

αII-spectrin and βII-spectrin do not affect TGFβ1-induced myofibroblast differentiation.

Science.gov (United States)

Piersma, Bram; Wouters, Olaf Y; Bank, Ruud A

2018-05-03

Mechanosensing of fibroblasts plays a key role in the development of fibrosis. So far, no effective treatments are available to treat this devastating disorder. Spectrins regulate cell morphology and are potential mechanosensors in a variety of non-erythroid cells, but little is known about the role of spectrins in fibroblasts. We investigate whether αII- and βII-spectrin are required for the phenotypic properties of adult human dermal (myo)fibroblasts. Knockdown of αII- or βII-spectrin in fibroblasts did not affect cell adhesion, cell size and YAP nuclear/cytosolic localization. We further investigated whether αII- and βII-spectrin play a role in the phenotypical switch from fibroblasts to myofibroblasts under the influence of the pro-fibrotic cytokine TGFβ1. Knockdown of spectrins did not affect myofibroblast formation, nor did we observe changes in the organization of αSMA stress fibers. Focal adhesion assembly was unaffected by spectrin deficiency, as was collagen type I mRNA expression and protein deposition. Wound closure was unaffected as well, showing that important functional properties of myofibroblasts are unchanged without αII- or βII-spectrin. In fact, fibroblasts stimulated with TGFβ1 demonstrated significantly lower endogenous mRNA levels of αII- and βII-spectrin. Taken together, despite the diverse roles of spectrins in a variety of other cells, αII- and βII-spectrin do not regulate cell adhesion, cell size and YAP localization in human dermal fibroblasts and are not required for the dermal myofibroblast phenotypical switch.

Receptors for insulin-like growth factor II (IGF-II) in the rat kidney glomerulus

International Nuclear Information System (INIS)

Haskell, J.F.; Pillion, D.J.; Meezan, E.

1986-01-01

Renal glomeruli were isolated by a technique involving renal perfusion with a solution containing magnetic iron oxide particles, followed by homogenization, sieving and isolation over a strong magnet. Isolated glomeruli were treated with 1% Triton X-100 to solubilize plasma membrane components while insoluble basement membrane components were removed by centrifugation. [ 125 I]Insulin-like growth factor-II (IGF-II) binding to this preparation was competitively inhibited by increasing amounts of unlabelled IGF-II, with 50% inhibition of binding observed at an IGF-II concentration of 1 ng/ml. [ 125 I]IGF-II was covalently cross-linked to its receptor with disuccinimidyl suberate in two tissues known to contain IGF-II receptors, the rat chondrosarcoma chondrocyte and the rat kidney tubule, as well as in rat renal glomeruli. In all three cases, a specific high-molecular weight (Mr = 255,000) band could be identified on autoradiograms of dodecyl sulfate polyacrylamide gels. These results indicate that the rat glomerulus contains a high-affinity receptor for IGF-II. This finding is consistent with the hypothesis that IGF-II plays a role in glomerular growth and differentiation

Solid phase selective separation and preconcentration of Cu(II) by Cu(II)-imprinted polymethacrylic microbeads.

Science.gov (United States)

Dakova, Ivanka; Karadjova, Irina; Ivanov, Ivo; Georgieva, Ventsislava; Evtimova, Bisera; Georgiev, George

2007-02-12

Ion-imprinted polymer (IIP) particles are prepared by copolymerization of methacrylic acid as monomer, trimethylolpropane trimethacrylate as crosslinking agent and 2,2'-azo-bis-isobutyronitrile as initiator in the presence of Cu(II), a Cu(II)-4-(2-pyridylazo)resorcinol (Cu(II)-PAR) complex, and PAR only. A batch procedure is used for the determination of the characteristics of the Cu(II) solid phase extraction from the IIP produced. The results obtained show that the Cu(II)-PAR IIP has the greatest adsorption capacity (37.4 micromol g(-1) of dry copolymer) among the IIPs investigated. The optimal pH value for the quantitative preconcentration is 7, and full desorption is achieved by 1 M HNO(3). The selectivity coefficients (S(Cu/Me)) for Me=Ni(II), Co(II) are 45.0 and 38.5, respectively. It is established that Cu(II)-PAR IIPs can be used repeatedly without a considerable adsorption capacity loss. The determination of Cu(II) ions in seawater shows that the interfering matrix does not influence the preconcentration and selectivity values of the Cu(II)-PAR IIPs. The detection and quantification limits are 0.001 micromol L(-1) (3sigma) and 0.003 micromol L(-1) (6sigma), respectively.

Use of APACHE II and SAPS II to predict mortality for hemorrhagic and ischemic stroke patients.

Science.gov (United States)

Moon, Byeong Hoo; Park, Sang Kyu; Jang, Dong Kyu; Jang, Kyoung Sool; Kim, Jong Tae; Han, Yong Min

2015-01-01

We studied the applicability of the Acute Physiology and Chronic Health Evaluation II (APACHE II) and Simplified Acute Physiology Score II (SAPS II) in patients admitted to the intensive care unit (ICU) with acute stroke and compared the results with the Glasgow Coma Scale (GCS) and National Institutes of Health Stroke Scale (NIHSS). We also conducted a comparative study of accuracy for predicting hemorrhagic and ischemic stroke mortality. Between January 2011 and December 2012, ischemic or hemorrhagic stroke patients admitted to the ICU were included in the study. APACHE II and SAPS II-predicted mortalities were compared using a calibration curve, the Hosmer-Lemeshow goodness-of-fit test, and the receiver operating characteristic (ROC) curve, and the results were compared with the GCS and NIHSS. Overall 498 patients were included in this study. The observed mortality was 26.3%, whereas APACHE II and SAPS II-predicted mortalities were 35.12% and 35.34%, respectively. The mean GCS and NIHSS scores were 9.43 and 21.63, respectively. The calibration curve was close to the line of perfect prediction. The ROC curve showed a slightly better prediction of mortality for APACHE II in hemorrhagic stroke patients and SAPS II in ischemic stroke patients. The GCS and NIHSS were inferior in predicting mortality in both patient groups. Although both the APACHE II and SAPS II systems can be used to measure performance in the neurosurgical ICU setting, the accuracy of APACHE II in hemorrhagic stroke patients and SAPS II in ischemic stroke patients was superior. Copyright © 2014 Elsevier Ltd. All rights reserved.

Better prognostic marker in ICU - APACHE II, SOFA or SAP II!

Science.gov (United States)

Naqvi, Iftikhar Haider; Mahmood, Khalid; Ziaullaha, Syed; Kashif, Syed Mohammad; Sharif, Asim

2016-01-01

This study was designed to determine the comparative efficacy of different scoring system in assessing the prognosis of critically ill patients. This was a retrospective study conducted in medical intensive care unit (MICU) and high dependency unit (HDU) Medical Unit III, Civil Hospital, from April 2012 to August 2012. All patients over age 16 years old who have fulfilled the criteria for MICU admission were included. Predictive mortality of APACHE II, SAP II and SOFA were calculated. Calibration and discrimination were used for validity of each scoring model. A total of 96 patients with equal gender distribution were enrolled. The average APACHE II score in non-survivors (27.97+8.53) was higher than survivors (15.82+8.79) with statistically significant p value (discrimination power than SAP II and SOFA.

VELOCITY-RESOLVED [C ii] EMISSION AND [C ii]/FIR MAPPING ALONG ORION WITH HERSCHEL *,**

Science.gov (United States)

Goicoechea, Javier R.; Teyssier, D.; Etxaluze, M.; Goldsmith, P.F.; Ossenkopf, V.; Gerin, M.; Bergin, E.A.; Black, J.H.; Cernicharo, J.; Cuadrado, S.; Encrenaz, P.; Falgarone, E.; Fuente, A.; Hacar, A.; Lis, D.C.; Marcelino, N.; Melnick, G.J.; Müller, H.S.P.; Persson, C.; Pety, J.; Röllig, M.; Schilke, P.; Simon, R.; Snell, R.L.; Stutzki, J.

2015-01-01

We present the first ~7.5′×11.5′ velocity-resolved (~0.2 km s−1) map of the [C ii] 158 μm line toward the Orion molecular cloud 1 (OMC 1) taken with the Herschel/HIFI instrument. In combination with far-infrared (FIR) photometric images and velocity-resolved maps of the H41α hydrogen recombination and CO J=2-1 lines, this data set provides an unprecedented view of the intricate small-scale kinematics of the ionized/PDR/molecular gas interfaces and of the radiative feedback from massive stars. The main contribution to the [C ii] luminosity (~85 %) is from the extended, FUV-illuminated face of the cloud (G0>500, nH>5×103 cm−3) and from dense PDRs (G≳104, nH≳105 cm−3) at the interface between OMC 1 and the H ii region surrounding the Trapezium cluster. Around ~15 % of the [C ii] emission arises from a different gas component without CO counterpart. The [C ii] excitation, PDR gas turbulence, line opacity (from [13C ii]) and role of the geometry of the illuminating stars with respect to the cloud are investigated. We construct maps of the L[C ii]/LFIR and LFIR/MGas ratios and show that L[C ii]/LFIR decreases from the extended cloud component (~10−2–10−3) to the more opaque star-forming cores (~10−3–10−4). The lowest values are reminiscent of the “[C ii] deficit” seen in local ultra-luminous IR galaxies hosting vigorous star formation. Spatial correlation analysis shows that the decreasing L[C ii]/LFIR ratio correlates better with the column density of dust through the molecular cloud than with LFIR/MGas. We conclude that the [C ii] emitting column relative to the total dust column along each line of sight is responsible for the observed L[C ii]/LFIR variations through the cloud. PMID:26568638

VELOCITY-RESOLVED [C ii] EMISSION AND [C ii]/FIR MAPPING ALONG ORION WITH HERSCHEL.

Science.gov (United States)

Goicoechea, Javier R; Teyssier, D; Etxaluze, M; Goldsmith, P F; Ossenkopf, V; Gerin, M; Bergin, E A; Black, J H; Cernicharo, J; Cuadrado, S; Encrenaz, P; Falgarone, E; Fuente, A; Hacar, A; Lis, D C; Marcelino, N; Melnick, G J; Müller, H S P; Persson, C; Pety, J; Röllig, M; Schilke, P; Simon, R; Snell, R L; Stutzki, J

2015-10-10

We present the first ~7.5'×11.5' velocity-resolved (~0.2 km s -1 ) map of the [C ii] 158 μ m line toward the Orion molecular cloud 1 (OMC 1) taken with the Herschel /HIFI instrument. In combination with far-infrared (FIR) photometric images and velocity-resolved maps of the H41 α hydrogen recombination and CO J =2-1 lines, this data set provides an unprecedented view of the intricate small-scale kinematics of the ionized/PDR/molecular gas interfaces and of the radiative feedback from massive stars. The main contribution to the [C ii] luminosity (~85 %) is from the extended, FUV-illuminated face of the cloud ( G 0 >500, n H >5×10 3 cm -3 ) and from dense PDRs ( G ≳10 4 , n H ≳10 5 cm -3 ) at the interface between OMC 1 and the H ii region surrounding the Trapezium cluster. Around ~15 % of the [C ii] emission arises from a different gas component without CO counterpart. The [C ii] excitation, PDR gas turbulence, line opacity (from [ 13 C ii]) and role of the geometry of the illuminating stars with respect to the cloud are investigated. We construct maps of the L [C ii]/ L FIR and L FIR / M Gas ratios and show that L [C ii]/ L FIR decreases from the extended cloud component (~10 -2 -10 -3 ) to the more opaque star-forming cores (~10 -3 -10 -4 ). The lowest values are reminiscent of the "[C ii] deficit" seen in local ultra-luminous IR galaxies hosting vigorous star formation. Spatial correlation analysis shows that the decreasing L [C ii]/ L FIR ratio correlates better with the column density of dust through the molecular cloud than with L FIR / M Gas . We conclude that the [C ii] emitting column relative to the total dust column along each line of sight is responsible for the observed L [C ii]/ L FIR variations through the cloud.

Sequestration of chelated copper by structural Fe(II): Reductive decomplexation and transformation of Cu{sup II}-EDTA

Energy Technology Data Exchange (ETDEWEB)

He, Hongping [State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092 (China); Wu, Deli, E-mail: wudeli@tongji.edu.cn [State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092 (China); Zhao, Linghui [State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092 (China); Luo, Cong [School of Civil and Environmental Engineering, Georgia Institute of Technology, GA 30332 (United States); Dai, Chaomeng; Zhang, Yalei [State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092 (China)

2016-05-15

Highlights: • Structural Fe(II) was found to reveal high sequestration potential in various chelated copper. • Chelated copper was reduced to Cu(0) and Cu{sub 2}O by =Fe(II), whcih was oxidized to Fe{sub 2}O{sub 3}·H{sub 2}O. • Both electron transfer and surface =Fe(II) were found to be crucial during chelated copper reduction. • The indispensible role of reductive decomplexation was identified in chelated copper sequestration. - Abstract: Chelated coppers, such as Cu{sup II}-EDTA, are characteristically refractory and difficult to break down because of their high stability and solubility. Cu{sup II}–EDTA sequestration by structural Fe(II) (=Fe(II)) was investigated intensively in this study. Up to 101.21 mgCu(II)/gFe(II) was obtained by =Fe(II) in chelated copper sequestration under near neutral pH condition (pH 7.70). The mechanism of Cu{sup II}-EDTA sequestration by =Fe(II) was concluded as follows: 3Cu{sup II}–EDTA + 7=Fe(II) + 9H{sub 2}O → Cu(0) ↓ + Cu{sub 2}O ↓ (the major product) + 2Fe{sub 2}O{sub 3}·H{sub 2}O ↓ + 3Fe{sup II}–EDTA +14H{sup +} Novel results strongly indicate that Cu{sup II} reductive transformation induced by surface =Fe(II) was mainly responsible for chelated copper sequestration. Cu(0) generation was initially facilitated, and subsequent reduction of Cu(II) into Cu(I) was closely combined with the gradual increase of ORP (Oxidation-Reduction Potential). Cu-containing products were inherently stable, but Cu{sub 2}O would be reoxidized to Cu(II) with extra-aeration, resulting in the release of copper, which was beneficial to Cu reclamation. Concentration diminution of Cu{sup II}–EDTA within the electric double layer and competitive adsorption were responsible for the negative effects of Ca{sup 2+}, Mg{sup 2+}. By generating vivianite, PO{sub 4}{sup 3−} was found to decrease surface =Fe(II) content. This study is among the first ones to identify the indispensible role of reductive decomplexation in chelated copper

RTNS-II operations guidebook

International Nuclear Information System (INIS)

Heikkinen, D.W.

1985-01-01

This guidebook is intended to provide training criteria, procedures and guidelines for operation of the RTNS-II neutron sources and ancilliary equipment. Use of this document requires full knowledge of the RTNS-II Facility Safety Procedure (FSP) and any Operational Safety Procedures (OSP) in effect. The RTNS-II FSP defines the hazards which may be encountered at RTNS-II and defines the procedures which must be followed in performing any task including operations. The purpose of this document is to provide a central source of detailed information concerning systems and equipment used in operating the RTNS-II neutron sources on a day-to-day basis. All members of the Operations Group are expected to be familiar with its contents. It is also intended to be used in training new members of the Operations Group

Cobalt(III), nickel(II) and ruthenium(II) complexes of 1,10 ...

Indian Academy of Sciences (India)

Co(II) and Ru(II) complexes investigated in this study effect photocleavage of the supercoiled ... DNA is related to their utility in the design and development of synthetic restriction ..... ∗Quasi-reversible/irreversible (electrochemical behaviour of ...

Cobalt(II), nickel(II), copper(II), zinc(II) and hafnium(IV) complexes of N'-(furan-3-ylmethylene)-2-(4-methoxyphenylamino)acetohydrazide.

Science.gov (United States)

Emam, Sanaa M; El-Saied, Fathy A; Abou El-Enein, Saeyda A; El-Shater, Heba A

2009-03-01

Cobalt(II), nickel(II), copper(II), zinc(II) and hafnium(IV) complexes of furan-2-carbaldehyde 4-methoxy-N-anilinoacetohydrazone were synthesized and characterized by elemental and thermal (TG and DTA) analyses, IR, UV-vis and (1)H NMR spectra as well as magnetic moment and molar conductivity. Mononuclear complexes are obtained with 1:1 molar ratio except complexes 3 and 9 which are obtained with 1:2 molar ratios. The IR spectra of ligand and metal complexes reveal various modes of chelation. The ligand behaves as a neutral bidentate one and coordination occurs via the carbonyl oxygen atom and azomethine nitrogen atom. The ligand behaves also as a monobasic tridentate one and coordination occurs through the enolic oxygen atom, azomethine nitrogen atom and the oxygen atom of furan ring. Moreover, the ligand behaves as a neutral tridentate and coordination occurs via the carbonyl oxygen, azomethine nitrogen and furan oxygen atoms as well as a monobasic bidentate and coordination occurs via the enolic oxygen atom and azomethine nitrogen atom. The electronic spectra and magnetic moment measurements reveal that all complexes possess octahedral geometry except the copper complex 10 possesses a square planar geometry. The thermal studies showed the type of water molecules involved in metal complexes as well as the thermal decomposition of some metal complexes.

Thiol-functionalized polysilsesquioxane as efficient adsorbent for adsorption of Hg(II) and Mn(II) from aqueous solution

International Nuclear Information System (INIS)

Niu, Yuzhong; Qu, Rongjun; Liu, Xiguang; Mu, Lei; Bu, Baihui; Sun, Yuting; Chen, Hou; Meng, Yangfeng; Meng, Lina; Cheng, Lin

2014-01-01

Highlights: • PMPSQ was promising adsorbent for the removal of Hg(II) and Mn(II). • The adsorption kinetics followed the pseudo-second-order model. • The adsorption isotherms can be described by the monolayer Langmuir model. • The adsorption was controlled by film diffusion and chemical ion-exchange mechanism. - Abstract: Thiol-functionalized polysilsesquioxane was synthesized and used for the adsorption of Hg(II) and Mn(II) from aqueous solution. Results showed that the optimal pH was about 6 and 5 for Hg(II) and Mn(II), respectively. Adsorption kinetics showed that the adsorption equilibriums were established within 100 min and followed pseudo-second-order model. Adsorption isotherms revealed that the adsorption capacities increased with the increasing of temperature. The adsorption was found to be well described by the monolayer Langmuir isotherm model and took place by chemical ion-exchange mechanism. The thermodynamic properties indicated the adsorption processes were spontaneous and endothermic nature. Selectively adsorption showed that PMPSQ can selectively adsorb Hg(II) from binary ion systems in the presence of the coexistent ions Mn(II), Cu(II), Pb(II), Co(II), and Ni(II). Based on the results, it is concluded that PMPSQ had comparable high adsorption efficiency and could be potentially used for the removal of Hg(II) and Mn(II) from aqueous solution

cobalt(II), nickel(II)

Indian Academy of Sciences (India)

Unknown

procedures. The supporting electrolyte, NaClO4 used in the voltammetric experiment was purchased from. Sigma. IR spectra were recorded in KBr medium on .... (13⋅6). L = Schiff base ligand form of one broad band envelope. The electronic spectra of Co(II) complex showed two spin-allowed transitions at 17856 and ...

Luminescence properties of copper(I), zinc(II) and cadmium(II) coordination compounds with picoline ligands

Energy Technology Data Exchange (ETDEWEB)

Małecki, Jan Grzegorz, E-mail: gmalecki@us.edu.pl; Maroń, Anna

2017-06-15

Mononuclear coordination compounds of copper(I) – [Cu(PPh{sub 3}){sub 2}(picoline)(NO{sub 3})], zinc(II) – [ZnCl{sub 2}(picoline){sub 2}] (picoline=3– and 4–methylpyridine) and polymeric cadmium(II) – [CdCl{sub 2}(β-picoline){sub 2}]{sub n} were prepared and their luminescence properties in solid state and acetonitrile solutions were determined. Single crystal X-ray crystallography revealed distorted tetrahedral geometry around the central ions of the compounds. The compounds exhibit green photoluminescence in solid state and in acetonitrile solutions. The emission of copper(I) compounds originated from metal-to-ligand charge transfer state combined with nitrato-to-picoline charge transfer state i.e. ({sup 1}(M+X)LCT). The presence of nitrato ligand in the coordination sphere of copper(I) compounds quenches the emission. Luminescence of zinc(II) and cadmium(II) compounds results from chloride-to-picoline charge transfer state and the quantum efficiency in the case of the polymeric Cd(II) compound reaches 39%. The photoluminescence quantum yields of the mononuclear zinc(II) compounds vary from 10 to 16% depending on the conditions (solid state, solution). - Graphical abstract: Coordination compounds of copper(I), zinc(II) and polymeric cadmium(II) with picoline ligands were prepared and their luminescence properties in solid state and acetonitrile solutions were determined. The compounds exhibit green photoluminescence in solid state and in acetonitrile solutions. Emission of copper(I) compounds originated from {sup 1}(M+X)LCT state. Luminescence of zinc(II) and cadmium(II) compounds results from chloride-to-picoline charge transfer state and the quantum efficiency in the case of the polymeric Cd(II) compound reaches 39%. The photoluminescence quantum yields of the mononuclear zinc(II) compounds vary from 10 to 16% depending on the conditions (solid state, solution).

BES-II fast data reconstruction

International Nuclear Information System (INIS)

Rong Gang; Zhang Jiawen; Guo Yiqing; Zhang Shaoqiang; Zhao Dixin

2002-01-01

The BES-II fast data reconstruction is reported. Based on PC FARM and/or a 'Distributed Clustered Linux PC System', BES-II fast data reconstruction system is set up. With this system the BES-II data can be fully reconstructed in about 20 minutes after data collection. It takes only 12 minutes to fully reconstruct 30000 events, collected with BES-II detector at BEPC Collider, with a P III-800 PC. The detector performance can be examined based on fully reconstructed data in about 20 minutes after data taking in the BES-II experiment

TAF(II)250: a transcription toolbox.

Science.gov (United States)

Wassarman, D A; Sauer, F

2001-08-01

Activation of RNA-polymerase-II-dependent transcription involves conversion of signals provided by gene-specific activator proteins into the synthesis of messenger RNA. This conversion requires dynamic structural changes in chromatin and assembly of general transcription factors (GTFs) and RNA polymerase II at core promoter sequence elements surrounding the transcription start site of genes. One hallmark of transcriptional activation is the interaction of DNA-bound activators with coactivators such as the TATA-box binding protein (TBP)-associated factors (TAF(II)s) within the GTF TFIID. TAF(II)250 possesses a variety of activities that are likely to contribute to the initial steps of RNA polymerase II transcription. TAF(II)250 is a scaffold for assembly of other TAF(II)s and TBP into TFIID, TAF(II)250 binds activators to recruit TFIID to particular promoters, TAF(II)250 regulates binding of TBP to DNA, TAF(II)250 binds core promoter initiator elements, TAF(II)250 binds acetylated lysine residues in core histones, and TAF(II)250 possesses protein kinase, ubiquitin-activating/conjugating and acetylase activities that modify histones and GTFs. We speculate that these activities achieve two goals--(1) they aid in positioning and stabilizing TFIID at particular promoters, and (2) they alter chromatin structure at the promoter to allow assembly of GTFs--and we propose a model for how TAF(II)250 converts activation signals into active transcription.

Synthesis of Pb(II Imprinted Carboxymethyl Chitosan and the Application as Sorbent for Pb(II Ion

Directory of Open Access Journals (Sweden)

Abu Masykur

2014-07-01

Full Text Available The aims of this research is to synthesize Pb(II imprinted polymers with carboxymethyl chitosan (CMC as polymers and bisphenol A diglycidyl ether (BADGE as cross-linker (Pb-IIP. Chitosan (CTS, non imprinted polymer (NIP and Pb-IIP were characterized using infrared (IR spectroscopy, X-ray diffraction (XRD, surface area analyzer (SAA, scanning electron microscopy (SEM, and energy dispersive X-ray (EDX spectroscopy. The result showed that the adsorption was optimum at pH 5 and contact time of 250 min. Adsorption of Pb(II ion with all of adsorbents followed pseudo-second order kinetic equation. Adsorption of Pb(II ion on CTS followed Freundlich isotherm while that on NIP and Pb-IIP followed the Langmuir adsorption isotherm. The adsorbent of Pb-IIP give higher capacity than the NIP and CTS. Adsorption capacity of Pb-IIP, NIP and CTS were 167.1, 128.9 and 76.1 mg/g, respectively. NIP gave higher adsorption selectivity for Pb(II/Ni(II and Pb(II/Cu(II, whereas Pb-IIP showed higher adsorption selectivity for Pb(II/Cd(II.The hydrogen bonding dominated interaction between Pb(II ion on NIP and Pb-IIP.

Synthesis, NMR characterization, X-ray crystal structure of Co(II) Ni(II) and Cu(II) complexes of a pyridine containing self-assembling

International Nuclear Information System (INIS)

Ranjbar, M.; Taghavipour, M.; Moghimi, A.; Aghabozorg, H.

2002-01-01

In the recent years, the self-assembling systems have been attracted chemists. The intermolecular bond in such systems mainly consists of ion pairing and hydrogen bonding [1,2]. The reaction between self-assembling system liquid LH 2 (py dc=2,6-pyridinedicarboxylic acid and py da=2,6- pyridine diamin) with cobalt (II) nitrate, nickel (II) chloride, and copper (II) acetate in water leads to the formation of self- assemble coordination complexes, [py da.H] 2 [M(py dc) 2 ]. H 2 O, M=Co(II),Ni(II), and Cu(II). The characterization was performed using elemental analysis, ESI mass spectroscopy, 1 H and 13 C NMR and X-ray crystallography. The crystal systems are monoclinic with space group P2 1 /n and four molecules per unit cell. These complexes shows 13 C NMR resonances of cationic counter ion [(py dc,H)] + in DMSO- d 6 but no signal corresponding to the two coordinated ligands [py dc] 2- The metal atoms are six-coordinated with a distorted octahedral geometry. The two [py de] 2- units are almost perpendicular to each other

New instruments at IPNS: POSY II and SAD II

International Nuclear Information System (INIS)

Crawford, R.K.; Felcher, G.P.; Kleb, R.; Epperson, J.E.; Thiyagarajan, P.

1988-01-01

Three new instruments are currently in varying degrees of development/construction at IPNS. One of these, the Glass, Liquid, and Amorphous Materials Diffractometer (GLAD) is the subject of a separate paper in these Proceedings, and so will not be discussed further here. The other two, a second neutron reflectometer (POSY II) and a second small-angle diffractometer (SAD II) are described briefly below. 5 refs., 1 fig., 1 tab

Differential Binding of Co(II) and Zn(II) to Metallo-beta-Lactamase Bla2 from Bacillus anthracis

Energy Technology Data Exchange (ETDEWEB)

Hawk, M.; Breece, R; Hajdin, C; Bender, K; Hu, Z; Costello, A; Bennett, B; Tierney, D; Crowder, M

2009-01-01

In an effort to probe the structure, mechanism, and biochemical properties of metallo-{beta}-lactamase Bla2 from Bacillus anthracis, the enzyme was overexpressed, purified, and characterized. Metal analyses demonstrated that recombinant Bla2 tightly binds 1 equiv of Zn(II). Steady-state kinetic studies showed that mono-Zn(II) Bla2 (1Zn-Bla2) is active, while di-Zn(II) Bla2 (ZnZn-Bla2) was unstable. Catalytically, 1Zn-Bla2 behaves like the related enzymes CcrA and L1. In contrast, di-Co(II) Bla2 (CoCo-Bla2) is substantially more active than the mono-Co(II) analogue. Rapid kinetics and UV-vis, 1H NMR, EPR, and EXAFS spectroscopic studies show that Co(II) binding to Bla2 is distributed, while EXAFS shows that Zn(II) binding is sequential. To our knowledge, this is the first documented example of a Zn enzyme that binds Co(II) and Zn(II) via distinct mechanisms, underscoring the need to demonstrate transferability when extrapolating results on Co(II)-substituted proteins to the native Zn(II)-containing forms.

Ulex europaeus agglutinin II (UEA-II) is a novel, potent inhibitor of complement activation.

Science.gov (United States)

Lekowski, R; Collard, C D; Reenstra, W R; Stahl, G L

2001-02-01

Complement is an important mediator of vascular injury following oxidative stress. We recently demonstrated that complement activation following endothelial oxidative stress is mediated by mannose-binding lectin (MBL) and activation of the lectin complement pathway. Here, we investigated whether nine plant lectins which have a binding profile similar to that of MBL competitively inhibit MBL deposition and subsequent complement activation following human umbilical vein endothelial cell (HUVEC) oxidative stress. HUVEC oxidative stress (1% O(2), 24 hr) significantly increased Ulex europaeus agglutinin II (UEA-II) binding by 72 +/- 9% compared to normoxic cells. UEA-II inhibited MBL binding to HUVEC in a concentration-dependent manner following oxidative stress. Further, MBL inhibited UEA-II binding to HUVEC in a concentration-dependent manner following oxidative stress, suggesting a common ligand. UEA-II (< or = 100 micromol/L) did not attenuate the hemolytic activity, nor did it inhibit C3a des Arg formation from alternative or classical complement pathway-specific hemolytic assays. C3 deposition (measured by ELISA) following HUVEC oxidative stress was inhibited by UEA-II in a concentration-dependent manner (IC(50) = 10 pmol/L). UEA-II inhibited C3 and MBL co-localization (confocal microscopy) in a concentration-dependent manner on HUVEC following oxidative stress (IC(50) approximately 1 pmol/L). Finally, UEA-II significantly inhibited complement-dependent neutrophil chemotaxis, but failed to inhibit fMLP-mediated chemotaxis, following endothelial oxidative stress. These data demonstrate that UEA-II is a novel, potent inhibitor of human MBL deposition and complement activation following human endothelial oxidative stress.

A Comparative Study on the Sorption Characteristics of Pb(II and Hg(II onto Activated Carbon

Directory of Open Access Journals (Sweden)

N. Muthulakshmi Andal

2010-01-01

Full Text Available Biosorption equilibrium and kinetics of Pb(II and Hg(II on coconut shell carbon (CSC were investigated by batch equilibration method. The effects of pH, adsorbent dosage, contact time, temperature and initial concentration of Pb(II and Hg(II on the activated carbon of coconut shell wastes were studied. Maximum adsorption of Pb(II occurred at pH 4.5 and Hg(II at pH 6. The sorptive mechanism followed the pseudo second order kinetics. The equilibrium data were analysed by Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. The equilibration data fitted well with both Langmuir and Freundlich isotherm model. The Langmuir adsorption capacity for Pb(II was greater than Hg(II. The mean free energy of adsorption calculated from Dubinin-Radushkevich (D-R isotherm model indicated that the adsorption of metal ions was found to be by chemical ion exchange. Thermodynamic parameter showed that the sorption process of Pb(II onto SDC was feasible, spontaneous and endothermic under studied conditions. A comparison was evaluated for the two metals.

Validace HPLC metody stanovení piroxikamu v plasmě s využitím SPME a deproteinace

OpenAIRE

Kuželová, Kristýna

2015-01-01

Validation of HPLC evaluatoin of piroxicam in plasma using SPME and precipitation Rigorous Thesis Mgr. Kristýna Kuželová Charles University in Prague, Faculty of Pharmacy in Hradec Kralove, Department of Pharmaceutical Chemistry and Drug Control, Heyrovského 1203, Hradec Králové The purpose of this thesis was bioanalytical evalution of piroxicam using High Performance Liquid Chromatagraphy (HPLC). Piroxicam was isolated from plasma using SPME and protein precipitacion. Plasma was adjusted to ...

Estimacion del impacto economico de la sequia agricola en el cultivo de maiz

OpenAIRE

Gallardo Ballat, Yurisbel; Brown Manrique, Oscar

2016-01-01

Se realiza una investigacion para determinar el impacto economico que provoca la sequia agricola en el cultivo de maiz en el municipio Venezuela. Se establecen tres escenarios de precipitaciones: seco, normal y lluvioso, asi como los niveles de impactos (bajo, medio y alto) a los que puede estar sometido el cultivo en condiciones de secano. En la investigacion se emplea la matriz de riesgo como herramienta fundamental para la determinacion de perdidas y ganancias financieras, teniendo en cuen...

Efecto de la energía cinética de la lluvia sobre la dinámica de las propiedades físicas y el encostramiento en un suelo arcilloso sin vegetación

OpenAIRE

Regüés-Muñoz, D.; Torri, D

2002-01-01

[ES] El abandono de cultivos causa en ocasiones un deterioro progresivo del suelo. El contexto climático Mediterráneo, por su régimen estacional de precipitaciones, favorece el encostramiento en suelos arcillosos descubiertos durante ciertas tormentas. El objetivo de este trabajo es diferenciar que factores distinguen dichas tormentas críticas, por medio de realizar series de simulaciones de lluvia en campo y laboratorio, combinando diferentes características de la lluvia y condic...

Transport with Astra in TJ-II; Transporte con Astra en TJ-II

Energy Technology Data Exchange (ETDEWEB)

Lopez-Bruna, D; Castejon, F; Fontdecaba, J M

2004-07-01

This report describes the adaptation of the numerical transport shell ASTRA for performing plasma calculations in the TJ-II stellarator device. Firstly, an approximation to the TJ-II geometry is made and a simple transport model is shared with two other codes in order to compare these codes (PROCTR, PRETOR-Stellarator) with ASTRA as calculation tool for TJ-II plasmas are provided: interpretative and predictive transport. The first consists in estimating the transport coefficients from real experimental data, thes being taken from three TJ-II discharges. The predictive facet is illustrated using a model that is able to includes self-consistently thedynamics of transport barriers. The report includes this model, written in the ASTRA programming language, to illustrate the use of ASTRA. (Author) 26 refs.

Patient-related barriers to pain management: the Barriers Questionnaire II (BQ-II).

Science.gov (United States)

Gunnarsdottir, Sigridur; Donovan, Heidi S; Serlin, Ronald C; Voge, Catherine; Ward, Sandra

2002-10-01

Patients' beliefs can act as barriers to optimal management of cancer pain. The Barriers Questionnaire (BQ) is a tool used to evaluate such barriers. Here, the BQ has been revised to reflect changes in pain management practices, resulting in the Barriers Questionnaire-II (BQ-II), a 27-item, self report instrument. This paper presents the results from two studies where the psychometric properties of the BQ-II were evaluated. In the first study, the responses of 27 nurses trained in pain management were compared to responses of a convenience sample of 12 patients with cancer. The results indicated that patients with cancer had higher mean scores on the BQ-II than did nurses trained in pain management. In the second study, a convenience sample of 172 patients with cancer responded to the BQ-II and a set of pain and quality of life (QOL) measures. A factor analysis supported four factors. Factor one, physiological effects, consists of 12 items addressing the beliefs that side effects of analgesics are inevitable and unmanageable, concerns about tolerance, and concerns about not being able to monitor changes in one's body when taking strong pain medications. Factor two, Fatalism, consists of three items addressing fatalistic beliefs about cancer pain and its management. Factor three, Communication, consists of six items addressing the concern that reports of pain distract the physician from treating the underlying disease, and the belief that 'good' patients do not complain of pain. The fourth and final factor, harmful effects, consists of six items addressing fear of becoming addicted to pain medication and the belief that pain medications harm the immune system. The BQ-II total had an internal consistency of 0.89, and alpha for the subscales ranged from 0.75 to 0.85. Mean (SD) scores on the total scale was 1.52 (0.73). BQ-II scores were related to measures of pain intensity and duration, mood, and QOL. Patients who used adequate analgesics for their levels of pain had

Standardization of radioimmunoassay for dosage of angiotensin II (ang-II) and its methodological evaluation

International Nuclear Information System (INIS)

Mantovani, Milene; Mecawi, Andre S.; Elias, Lucila L.K.; Antunes-Rodrigues, Jose

2011-01-01

This paper standardizes the radioimmunoassay (RIA) for dosage of ANG-II of rats, after experimental conditions of saline hypertonic (2%), treating with losartan (antagonist of ANG-II), hydric privation, and acute hemorrhage (25%). After that, the plasmatic ANG-II was extracted for dosage of RIA, whose sensitiveness was of 1.95 pg/m L, with detection of 1.95 to 1000 pg/m L. The treatment with saline reduced the concentration of ANG-II, while the administration pf losartan, the hydric administration and the hemorrhage increase the values, related to the control group. Those results indicate variations in the plasmatic concentration of ANG-II according to the experimental protocols, validating the method for evaluation of activity renin-angiotensin

Lead (II) and nickel (II) adsorption kinetics from aqueous metal ...

African Journals Online (AJOL)

This paper discusses the kinetics of lead (II) and Nickel (II) ions adsorption from aqueous solutions using chemically modified and unmodified agricultural adsorbents at 28°C, pH 6.2 and 0.01M NaCl ionic strength. The removal of the two metals were found to increase with increase in chemical modification, the sequence ...

Algebra II workbook for dummies

CERN Document Server

Sterling, Mary Jane

2014-01-01

To succeed in Algebra II, start practicing now Algebra II builds on your Algebra I skills to prepare you for trigonometry, calculus, and a of myriad STEM topics. Working through practice problems helps students better ingest and retain lesson content, creating a solid foundation to build on for future success. Algebra II Workbook For Dummies, 2nd Edition helps you learn Algebra II by doing Algebra II. Author and math professor Mary Jane Sterling walks you through the entire course, showing you how to approach and solve the problems you encounter in class. You'll begin by refreshing your Algebr

Structural characterization and antioxidant properties of Cu(II) and Ni(II) complexes derived from dicyandiamide

Science.gov (United States)

Kertmen, Seda Nur; Gonul, Ilyas; Kose, Muhammet

2018-01-01

New Cu(II) and Ni(II) complexes derived from dicyandiamide were synthesized and characterised by spectroscopic and analytical methods. Molecular structures of the complexes were determined by single crystal X-ray diffraction studies. In the complexes, the Cu(II) or Ni(II) ions are four-coordinate with a slight distorted square planar geometry. The ligands (L-nPen and L-iPen) derived from dicyandiamide formed via nucleophilic addition of alcohol solvent molecule in the presence Cu(II) or Ni(II) ions. Complexes were stabilised by intricate array of hydrogen bonding interactions. Antioxidant activity of the complexes was evaluated by DPPH radical scavenging and CUPRAC methods. The complexes exhibit antioxidant activity, however, their activities were much lower than standard antioxidants (Vitamin C and trolox).

Polymerization of Methyl Methacrylate Catalyzed by Co(II), Cu(II), and Zn(II) Complexes Bearing N-Methyl-N-((pyridin-2-yl)methyl) cyclohexanamine

Energy Technology Data Exchange (ETDEWEB)

Ahn, Seoung Hyun; Lee, Hyosun [Kyungpook National University, Daegu (Korea, Republic of); Shin, Jongwon [POSTECH, Pohang (Korea, Republic of); Nayab, Saira [Shaheed Benazir Bhutto University, Sheringal (Pakistan)

2016-05-15

We demonstrated the synthesis and characterization of Co(II), Cu(II), and Zn(II) complexes ligated to N-methyl-N-((pyridin-2-yl)methyl)cyclohexanamine. The complex [Co(nmpc)Cl{sub 2}] in the presence of MMAO showed the highest catalytic activity for MMA polymerization at 60 °C compared with its Zn(II) and Cu(II) analogs. The metal center showed an obvious influence on the catalytic activity, although this appeared to have no effect on the stereo-regularity of the resultant PMMA. X-ray diffraction analysis revealed that [Co(nmpc)Cl{sub 2}] and [Zn(nmpc)Cl{sub 2}] crystallized in the monoclinic system with space group P2{sub 1}/c and existed as monomeric and solvent-free complexes.

Spectroscopic, Elemental and Thermal Analysis, and Positron Annihilation Studies on Ca(II), Sr(II), Ba(II), Pb(II), and Fe(III) Penicillin G Potassium Complexes

Science.gov (United States)

Refat, M. S.; Sharshara, T.

2015-11-01

The [Pb(Pin)2] · 3H2O, [M(Pin)(H2O)2(Cl)] · nH2O (M = SrII, CaII or BaII; n = 0-1), and [Fe(Pin)2(Cl)(H2O)] · H2O penicillin G potassium (Pin) complexes were synthesized and characterized using elemental analyses, molar conductivity, thermal analysis and electronic spectroscopy techniques. The positron annihilation lifetime (PAL) and Doppler broadening (DB) techniques have been employed to probe the defects and structural changes of Pin ligand and its complexes. The PAL and DB line-shape parameters were discussed in terms of the structure, molecular weight, ligand-metal molar ratio, and other properties of the Pin complexes.

Preparation, infrared, raman and nmr spectra of N,N'-diethylthiourea complexes with zinc(II), cadmium(II) and mercury(II) halides

Energy Technology Data Exchange (ETDEWEB)

Marcotrigiano, G [Bari Univ. (Italy). Cattedra di Chimica, Facolta di Medicina-Veterinaria

1976-05-01

Several complexes of N,N'-diethylthiourea (Dietu) with zinc(II), cadmium(II) and mercury(II) halides were prepared and characterized by i.r. (4000-60 cm/sup -1/), raman (400-60 cm/sup -1/), in the solid state and n.m.r. and conductometric methods in solution. The complexes Zn(Dietu)/sub 2/X/sub 2/, Cd(Dietu)/sub 2/X/sub 2/ (X=Cl, Br, I) and Hg(Dietu)/sub 2/X/sub 2/ (X=Br, I) are tetrahedral species in which intramolecular -NH...X interactions have been observed. The 1:1 mercury(II) complexes, Hg(Dietu)X/sub 2/ (X=Cl, Br), appear to have a dimeric tetrahedral halide-bridged structure in the solid state. In all these complexes N,N'-diethylthiourea is sulphur-bonded to the metal.

Probing HeII Reionization at z>3.5 with Resolved HeII Lyman Alpha Forest Spectra

Science.gov (United States)

Worseck, Gabor

2017-08-01

The advent of GALEX and COS have revolutionized our view of HeII reionization, the final major phase transition of the intergalactic medium. COS spectra of the HeII Lyman alpha forest have confirmed with high confidence the high HeII transmission that signifies the completion of HeII reionization at z 2.7. However, the handful of z>3.5 quasars observed to date show a set of HeII transmission 'spikes' and larger regions with non-zero transmission that suggest HeII reionization was well underway by z=4. This is in striking conflict with predictions from state-of-the-art radiative transfer simulations of a HeII reionization driven by bright quasars. Explaining these measurements may require either faint quasars or more exotic sources of hard photons at z>4, with concomitant implications for HI reionization. However, many of the observed spikes are unresolved in G140L spectra and are significantly impacted by Poisson noise. Current data cannot reliably probe the ionization state of helium at z>3.5.We request 41 orbits to obtain science-grade G130M spectra of the two UV-brightest HeII-transmitting QSOs at z>3.5 to confirm and resolve their HeII transmission spikes as an unequivocal test of early HeII reionization. These spectra are complemented by recently obtained data from 8m telescopes: (1) Echelle spectra of the coeval HI Lya forest to map the underlying density field that modulates the HeII absorption, and (2) Our dedicated survey for foreground QSOs that may source the HeII transmission. Our recent HST programs revealed the only two viable targets to resolve the z>3.5 HeII Lyman alpha forest, and to conclusively solve this riddle.

The TFIID components human TAF(II)140 and Drosophila BIP2 (TAF(II)155) are novel metazoan homologues of yeast TAF(II)47 containing a histone fold and a PHD finger.

Science.gov (United States)

Gangloff, Y G; Pointud, J C; Thuault, S; Carré, L; Romier, C; Muratoglu, S; Brand, M; Tora, L; Couderc, J L; Davidson, I

2001-08-01

The RNA polymerase II transcription factor TFIID comprises the TATA binding protein (TBP) and a set of TBP-associated factors (TAF(II)s). TFIID has been extensively characterized for yeast, Drosophila, and humans, demonstrating a high degree of conservation of both the amino acid sequences of the constituent TAF(II)s and overall molecular organization. In recent years, it has been assumed that all the metazoan TAF(II)s have been identified, yet no metazoan homologues of yeast TAF(II)47 (yTAF(II)47) and yTAF(II)65 are known. Both of these yTAF(II)s contain a histone fold domain (HFD) which selectively heterodimerizes with that of yTAF(II)25. We have cloned a novel mouse protein, TAF(II)140, containing an HFD and a plant homeodomain (PHD) finger, which we demonstrated by immunoprecipitation to be a mammalian TFIID component. TAF(II)140 shows extensive sequence similarity to Drosophila BIP2 (dBIP2) (dTAF(II)155), which we also show to be a component of Drosophila TFIID. These proteins are metazoan homologues of yTAF(II)47 as their HFDs selectively heterodimerize with dTAF(II)24 and human TAF(II)30, metazoan homologues of yTAF(II)25. We further show that yTAF(II)65 shares two domains with the Drosophila Prodos protein, a recently described potential dTAF(II). These conserved domains are critical for yTAF(II)65 function in vivo. Our results therefore identify metazoan homologues of yTAF(II)47 and yTAF(II)65.

Synthesis and structural characterisation of iron(II) and copper(II) diphosphates containing flattened metal oxotetrahedra

Energy Technology Data Exchange (ETDEWEB)

Keates, Adam C. [School of Chemistry, University of Southampton, Southampton, Hampshire SO17 1B,. UK (United Kingdom); Wang, Qianlong [Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY (United Kingdom); Weller, Mark T., E-mail: m.t.weller@bath.ac.uk [Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY (United Kingdom)

2014-02-15

Single crystal and bulk polycrystalline forms of K{sub 2}MP{sub 2}O{sub 7} (M=Fe(II), Cu(II)) have been synthesised and their structures determined from single crystal X-ray diffraction data. Both compounds crystallize in the tetragonal system, space group P-42{sub 1}m. Their structures are formed from infinite sheets of linked oxopolyhedra of the stoichiometry [MP{sub 2}O{sub 7}]{sup 2−} with potassium cations situated between the layers. The MO{sub 4} tetrahedra share oxygen atoms with [P{sub 2}O{sub 7}]{sup 4−} diphosphate groups and the potassium ions have KO{sub 8} square prismatic geometry. In both compounds the M(II) centre has an unusual strongly flattened, tetrahedral coordination to oxygen, as a result of the Jahn–Teller (JT) effect for the high spin d{sup 6} Fe(II) and p-orbital mixing or a second order JT effect for d{sup 9} Cu(II) centres in four fold coordination. The uncommon transition metal ion environments found in these materials are reflected in their optical absorption spectra and magnetism data. - Graphical abstract: The structures of the tetragonal polymorphs of K{sub 2}MP{sub 2}O{sub 7}, M=Cu(II), Fe(II), consist of infinite sheets of stoichiometry [MP{sub 2}O{sub 7}]{sup 2−}, formed from linked pyrophosphate groups and MO{sub 4} tetrahedra, separated by potassium ions. In both compounds the unusual tetrahedral coordination of the M(II) centre is strongly flattened as a result of Jahn–Teller (JT) effects for high spin, d{sup 6} Fe(II) and p-orbital mixing and second-order JT effects for d{sup 9} Cu(II). Display Omitted - Highlights: • Tetrahedral copper and iron(II) coordinated by oxygen. • New layered phosphate structure. • Jahn–Teller and d{sup 10} distorted coordinations.

Synthesis and structural characterisation of iron(II) and copper(II) diphosphates containing flattened metal oxotetrahedra

International Nuclear Information System (INIS)

Keates, Adam C.; Wang, Qianlong; Weller, Mark T.

2014-01-01

Single crystal and bulk polycrystalline forms of K 2 MP 2 O 7 (M=Fe(II), Cu(II)) have been synthesised and their structures determined from single crystal X-ray diffraction data. Both compounds crystallize in the tetragonal system, space group P-42 1 m. Their structures are formed from infinite sheets of linked oxopolyhedra of the stoichiometry [MP 2 O 7 ] 2− with potassium cations situated between the layers. The MO 4 tetrahedra share oxygen atoms with [P 2 O 7 ] 4− diphosphate groups and the potassium ions have KO 8 square prismatic geometry. In both compounds the M(II) centre has an unusual strongly flattened, tetrahedral coordination to oxygen, as a result of the Jahn–Teller (JT) effect for the high spin d 6 Fe(II) and p-orbital mixing or a second order JT effect for d 9 Cu(II) centres in four fold coordination. The uncommon transition metal ion environments found in these materials are reflected in their optical absorption spectra and magnetism data. - Graphical abstract: The structures of the tetragonal polymorphs of K 2 MP 2 O 7 , M=Cu(II), Fe(II), consist of infinite sheets of stoichiometry [MP 2 O 7 ] 2− , formed from linked pyrophosphate groups and MO 4 tetrahedra, separated by potassium ions. In both compounds the unusual tetrahedral coordination of the M(II) centre is strongly flattened as a result of Jahn–Teller (JT) effects for high spin, d 6 Fe(II) and p-orbital mixing and second-order JT effects for d 9 Cu(II). Display Omitted - Highlights: • Tetrahedral copper and iron(II) coordinated by oxygen. • New layered phosphate structure. • Jahn–Teller and d 10 distorted coordinations

Quality assurance guidance for TRUPACT-II [Transuranic Package Transporter-II] payload control

International Nuclear Information System (INIS)

1989-10-01

The Transuranic Package Transporter-II (TRUPACT-II) Safety Analysis Report for Packaging (SARP) approved by the Nuclear Regulatory Commission (NRC), discusses authorized methods for payload control in Appendix 1.3.7 and the Quality Assurance (QA) requirements in Section 9.3. Subsection 9.3.2.1 covers maintenance and use of the TRUPACT-II and the specific QA requirements are given in DOE/WIPP 89-012. Subsection 9.3.2.2 covers payload compliance, for which this document was written. 6 refs

TRUPACT-II, a regulatory perspective

International Nuclear Information System (INIS)

Gregory, P.C.; Spooner, O.R.

1995-01-01

The Transuranic Package Transporter II (TRUPACT-II) is a US Nuclear Regulatory Commission (NRC) certified Type B packaging for the shipment of contact-handled transuranic (CH-TRU) material by the US Department of Energy (DOE). The NRC approved the TRUPACT-II design as meeting the requirements of Title 10, Code of Federal Regulations, Part 71 (10 CFR 71) and issued Certificate of Compliance (CofC) Number 9218 to the DOE. There are currently 15 certified TRUPACT-IIs. Additional TRUPACT-IIs will be required to make more than 15,000 shipments of CH-TRU waste to the Waste Isolation Pilot Plant (WIPP) site near Carlsbad, New Mexico. The TRUPACT-II may also be used for the DOE inter-site and intra-site shipments of CH-TRU waste. The Land Withdrawal Act (Public Law 102-579), enacted by the US Congress, October 30, 1992, and an agreement between the DOE and the State of New Mexico, signed August 4, 1987, both stipulate that only NRC approved packaging may be used for shipments of TRU waste to the WIPP. Early in the TRUPACT-II development phase it was decided that the transportation system (tractor, trailer, and TRUPACT-II) should be highway legal on all routes without the need for oversize and/or overweight permits. In large measure, public acceptance of the DOE's efforts to safely transport CH-TRU waste depends on the public's perception that the TRUPACT-II is in compliance with all applicable regulations, standards, and quality assurance requirements. This paper addresses some of the numerous regulations applicable to Type B packaging, and it describes how the TRUPACT-II complies with these regulations

Communications Received from Certain Member States Regarding Guidelines for the Export of Nuclear Material, Equipment and Technology. Nuclear Transfers and Nuclear-Related Dual-Use Transfers; Comunicaciones Recibidas De Diversos Estados Miembros Relativas A Las Directrices Para La Exportacion De Tecnologia, Equipo Y Materiales Nucleares. Transferencias Nucleares Y Transferencias De Equipo, Materiales V Tecnologia Afin Al Doble Uso En Materia Nuclear

Energy Technology Data Exchange (ETDEWEB)

NONE

1993-04-15

The Director General has received a Note Verbale dated 5 March 1993 from the Ministry of Foreign Affairs of the Slovak Republic. The purpose of the Note Verbale is to provide information on that Governments' guidelines for Nuclear Transfers and for Transfers of of Nuclear-related Dual-use Equipment, Material and Related Technology. In the light of the wish expressed at the end of each Note Verbale, the text of the Note Verbale is annexed hereto [Spanish] El Director General ha recibido una nota verbal de fecha 5 de marzo de 1993 del Ministerio de Relaciones Exteriores de la RepUblica Eslovaca. El objetivo de la nota verbal es proporcionar informaciOn sobre las Directrices para las transferencias nucleares y las Directrices para la transferencia de equipo, materiales y tecnologia afin al doble uso en materia nuclear, de dicho Gobierno. Atendiendo a los deseos expresados al final de la nota verbal, se adjunta al presente documento el texto de la nota verbal.

Synchronous determination of mercury (II) and copper (II) based on quantum dots-multilayer film

International Nuclear Information System (INIS)

Ma Qiang; Ha Enna; Yang Fengping; Su Xingguang

2011-01-01

Graphical abstract: We developed a sensitive sensor for synchronous detection of Hg (II) and Cu (II) based on the quenchedand recovered PL intensity of QDs-multilayer films. Solutions containing Hg (II) or Cu (II) were used to quench the fluorescence of the QDs-multilayer films firstly. Then, glutathione (GSH) was used to remove Hg (II) or Cu (II) from the QDs-multilayer films due to stronger affinity of GSH-metal ions than that of QDs metal ions. Thus, the fluorescence of QDs-multilayer films was recovered. Highlights: → QDs-multilayer films were developed for synchronous detection of Hg (II) and Cu (II). → Hg (II) and Cu (II) could quench the photoluminescence of the QDs-multilayer films. → Glutathione was used to remove metal ions and recovery photoluminescence of QDs-multilayer films. - Abstract: A sensitive sensor for mercury (II) and copper (II) synchronous detection was established via the changed photoluminescence of CdTe quantum dots (QDs) multilayer films in this work. QDs were deposited on the quartz slides to form QDs-multilayer films by electrostatic interactions with poly(dimethyldiallyl ammonium chloride) (PDDA). Hg 2+ or Cu 2+ could quench the photoluminescence of the QDs-multilayer films, and glutathione (GSH) was used to remove Hg 2+ or Cu 2+ from QDs-multilayer films due to strong affinity of GSH-metal ions, which resulted in the recovered photoluminescence of QDs-multilayer films. There are good linear relationships between the metal ions concentration and the photoluminescence intensity of QDs in the quenched and recovered process. It was found that the Stern-Volmer constants for Hg 2+ are higher than that for Cu 2+ . Based on different quenching and recovery constant between Hg 2+ and Cu 2+ , the synchronous detection of Hg 2+ and Cu 2+ can be achieved. The linear ranges of this assay were obtained from 0.005 to 0.5 μM for Hg 2+ and from 0.01 to 1 μM for Cu 2+ , respectively. And the artificial water samples were determined by this

Communications Received from Certain Member States Regarding Guidelines for Transfers of Nuclear-related Dual-use Equipment, Materials, Software and Related Technology; Comunicaciones recibidas de diversos Estados Miembros relativas a las directrices para las transferencias de equipos, materiales y programas informaticos (software) de doble uso del ambito nuclear y tecnologia relacionada

Energy Technology Data Exchange (ETDEWEB)

NONE

2006-04-11

The Director General of the International Atomic Energy Agency has received Notes Verbales, dated 1 December 2005, from the Resident Representatives to the Agency of Argentina, Australia, Austria, Belarus, Belgium, Brazil, Bulgaria, Canada, Croatia, Czech Republic, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Japan, Republic of Korea, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, New Zealand, Poland, Portugal, Slovenia, South Africa, Spain, Sweden, Switzerland, Turkey, Ukraine, the United Kingdom of Great Britain and Northern Ireland and the United States of America, relating to transfers of nuclear-related dual-use equipment, materials, software and related technology [Spanish] El Director General del Organismo Internacional de Energia Atomica ha recibido Notas verbales de fecha 1 de diciembre de 2005 de los Representantes Permanentes ante el Organismo de Alemania, Argentina, Australia, Austria, Belarus, Belgica, Brasil, Bulgaria, Canada, Croacia, Eslovenia, Espana, Estados Unidos de America, Estonia, Finlandia, Francia, Grecia, Hungria, Irlanda, Italia, Japon, Letonia, Lituania, Luxemburgo, Malta, Nueva Zelandia, Paises Bajos, Polonia, Portugal, Reino Unido de Gran Bretana e Irlanda del Norte, Republica Checa, Republica de Corea, Sudafrica, Suecia, Suiza, Turquia y Ucrania relativas a las transferencias de equipos, materiales y programas informaticos de doble uso del ambito nuclear y tecnologia relacionada.

The physics design of EBR-II; Physique du reacteur EBR-II; Fizicheskij raschet ehksperimental'nogo reaktora - razmnozhitelya EVR-II; Aspectos fisicos del reactor EBR-II

Energy Technology Data Exchange (ETDEWEB)

Loewenstein, W. B. [Argonne National Laboratory, Argonne, IL (United States)

1962-03-15

The physics design oi EBR-II. Calculations of the static, dynamic and long-term reactivity behaviour of EBR-II are reported together with results and analysis of EBR-II dry critical and ZPR-III mock-up experiments. Particular emphasis is given to reactor-physics design problems which arise after the conceptual design is established and before the reactor is built or placed into operation. Reactor-safety analyses and hazards-evaluation considerations are described with their influence on the reactor design. The manner of utilizing the EBR-II mock-up on ZPR-III data and the EBR-II dry critical data is described. These experiments, their analysis and theoretical predictions are the basis for predetermining the physics behaviour of the reactor system. The limitations inherent in applying the experimental data to the performance of the power-reactor system are explored in some detail. This includes the specification of reactor core size and/or fuel-alloy enrichment, provisions for adequate operating and shut-down reactivity, determination of operative temperature and power coefficients of reactivity, and details of power- and flux-distribution as a function of position within the reactor structure. The overall problem of transferring information from simple idealized analytical or experimental geometry to actual hexagonal reactor geometry is described. Nuclear performance, including breeding, of the actual reactor system is compared with that of the idealized conceptual system. The long-term reactivity and power behaviour of the reactor blanket is described within the framework of the proposed cycling of the fuel and blanket alloy. Safety considerations, including normal and abnormal rates of reactivity-insertion, the implication of postulated reactivity effects based on the physical behaviour of the fuel alloy and reactor structure as well as extrapolation of TREAT experiments to the EBR-II system are analysed. The EBR-II core melt-down problem is reviewed. (author

Ni(II) and Cu(II) binding with a 14-aminoacid sequence of Cap43 protein, TRSRSHTSEGTRSR.

Science.gov (United States)

Zoroddu, M A; Kowalik-Jankowska, T; Kozlowski, H; Salnikow, K; Costa, M

2001-03-01

The tetradecapeptide containing the 10 aminoacid repeated sequence on the C-terminus of the Ni(II)-induced Cap43 protein, was analyzed for Ni(II) and Cu(II) binding. A combined pH-metric and spectroscopic UV-VIS, EPR, CD and NMR study of Ni(II) and Cu(II) binding to the blocked CH3CO-Thr-Arg-Ser-Arg-Ser-His-Thr-Ser-Glu-Gly-Thr-Arg-Ser-Arg-NH2 (Ac-TRSRSHTSEGTRSR-Am) peptide, modeling a part of the C-terminal sequence of the Cap43 protein, revealed the formation of octahedral complexes involving imidazole nitrogen of histidine, at pH 5.5 and pH 7 for Cu(II) and Ni(II), respectively; a major square planar 4N-Ni(II) complex (about 100% at pH 9, log K* = -28.16) involving imidazole nitrogen of histidine and three deprotonated amide nitrogens of the backbone of the peptide was revealed; a 3N-Cu(II) complex (maximum about 70% at pH 7, log K*=-13.91) and a series of 4N-Cu(II) complexes starting at pH 5.5 (maximum about 90% at pH 8.7, log K* = -21.39 for CuH(-3)L), were revealed. This work supports the existence of a metal binding site at the COOH-terminal part of the Cap43 peptide.

Stability constants of salicylate of zinc(II), cobalt(II), uranyl(II) and thorium(IV) by paper electrophoresis

International Nuclear Information System (INIS)

Singh, R.K.P.; Yadava, J.R.; Yadava, P.C.; Yadava, K.L.

1983-01-01

Stability constants of zinc(II), cobalt(II), uranyl(II) and thorium(IV) have been determined by paper electrophoresis. Salicylic acid (0.005 mol dm - 3 ) was added to the background electrolyte: 0.1 mol dm - 3 HClO 4 . The proportions of C 6 H 4 OHCOO - and C 6 H 4 OCOO/sup =/ were varied by changing the pH of the electrolyte. These anions yielded the complexes, ZnC 6 H 4 OHCOO + , CoC 6 H 4 OHCOO + , Th(C 6 H 4 OHCOO) 4 and UO 2 (C 6 H 4 OCOO) 2 /sup =/ whose stability constants are found to be 10/sup 3.1/, 10/sup 3.2/, 10/sup 11.6/ and 10/sup 22.2/, respectively (μ = 0.1, temp. 40 0 C). (author)

Nuclear physics II

International Nuclear Information System (INIS)

Elze, T.

1988-01-01

This script consisting of two parts contains the matter of the courses Nuclear Pyhsics I and II, as they were presented in the winter term 1987/88 and summer term 1988 for students of physics at Frankfurt University. In the present part II the matter of the summer term is summarized. (orig.) [de

Structural and antimicrobial studies of coordination compounds of VO(II, Co(II, Ni(II and Cu(II with some Schiff bases involving 2-amino-4-chlorophenol

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A. P. MISHRA

2009-05-01

Full Text Available Complexes of tailor-made ligands with life essential metal ions may be an emerging area to answer the problem of multi-drug resistance (MDR. The coordination complexes of VO(II, Co(II, Ni(II and Cu(II with the Schiff bases derived from 2-hydroxyacetophenone/2-chlorobenzaldehyde with 2-ami¬no-4-chlorophenol were synthesized and characterized by elemental analysis, molar conductance, electronic spectra, FT-IR, ESR, FAB mass, thermal and magnetic susceptibility measurements. The FAB mass and thermal data show degradation of the complexes. The ligand A (2-hydroxyacetophenone-2amino-4-chlorophenol behaved as tridentate and ligand B (2-chlorobenzylidene-2-amino-4-chlorophenol as bidentate, coordinating through O and N donors. The complexes [VO(A(H2O]×xH2O, [M(A(H2On]×xH2O for Co and Ni, [Cu(A(H2O] and [VO(B2]×xH2O, [M(B2(H2On] for Co and Cu and [Ni(B2] exhibited coordination numbers 4, 5 or 6. X-ray powder diffraction data (a = 11.00417 Å, b = 11.706081 Å and c = 54.46780 Å showed that [Cu(CACP2(H2O2], complex 8, crystallized in the orthorhombic system. The in vitro biological screening effects of the investigated compounds were tested against the bacteria Escherichia coli, Staphylococcus aureus and Streptococcus fecalis and the fungi Aspergillus niger, Trichoderma polysporum and Candida albicans by the serial dilution method. A comparative study of the MIC values of the Schiff base and their [M(B2(H2O2] complexes (Co(II, complex 6 and Cu(II, complex 8, indicated that the metal complexes exhibited a higher or lower antimicrobial activity than 2-chlorobenzylidene-2-amino-4-chlorophenol as the free ligand (B.

Biosorption of cadmium (II) and lead (II) from aqueous solutions using mushrooms: A comparative study

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Vimala, R., E-mail: vimararagu@yahoo.co.in [School of Biotechnology, Chemical and Biomedical Engineering, VIT University, Vellore 632014, Tamil Nadu (India); Das, Nilanjana [School of Biotechnology, Chemical and Biomedical Engineering, VIT University, Vellore 632014, Tamil Nadu (India)

2009-08-30

Sorption capacity of oyster mushroom (Pleurotus platypus), button mushroom (Agaricus bisporus) and milky mushroom (Calocybe indica) were evaluated on biosorption of heavy metals, viz. cadmium (II) and lead (II) from aqueous solutions. The optimum sorption conditions were studied for each metal separately. The desired pH of the aqueous solution was found to be 6.0 for the removal of cadmium (II) and 5.0 for removal of lead (II) for all the mushrooms. The percent removal of both the metals was found to increase with the increase in biosorbent dosage and contact time. The fitness of the biosorption data for Langmuir and Freundlich adsorption models was investigated. It was found that biosorption of cadmium (II) and lead (II) ions onto the biomass of the three mushrooms were better suitable to Langmuir than Freundlich adsorption model. P. platypus showed the highest metal uptake potential for cadmium (q{sub max} 34.96 mg/g) whereas A. bisporus exhibited maximum potential for lead (q{sub max} 33.78 mg/g). Milky mushroom showed the lowest metal uptake capacity for both the metals. The present data confirms that mushrooms may be used as efficient biosorbent for the removal of cadmium (II) and lead (II) ions from aqueous solution.

Profesar la profesión de profesor. Entre el filósofo y el agente doble Professing the teacher's profession. Between the philosopher and the double agent

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Jose Garcia Molina

2013-03-01

Full Text Available

Desde su puesta en marcha el Plan Bolonia ha generado un amplio debate alrededor de la deriva mercantilista-neoliberal que introduce en todos los niveles de la institución universitaria. La tensión entre visiones idealizadas de la universidad, seguramente inviables, y visiones utilitaristas, a todas luces injustas, centra el foco de la discusión. Tales tensiones sacan a la luz la pluriversidad y multiversidad que atraviesan la universidad actual.

¿A qué da y a qué puede dar forma todavía la universidad y sus profesionales? Tomando como referencia algunas enseñanzas de Alain Badiou y de Jacques Derrida intentamos pensar la situación universitaria y los vínculos entre el profesar, el profesor y la profesión. El análisis pretende sintetizar, de otras maneras, lo que la universidad puede o puede ser en la actualidad. Síntesis que nos lleva a pensar la función del docente universitario mediante las metáforas del filósofo y el agente doble.

From its beginnings the Bolonya plan has generated a wide debate around its market-oriented and neoliberal tendencies, present at all levels of the university institution. The tension between idealized views of the university, probably impossible to realize, and utilitarian views, clearly unjust, centers the focus of the debate. These tensions bring to light the pluriversity and multiversity that traverse the contemporary university.

To what does the university and its professionals still give form? Taking as a reference some teachings by Alain Badiou and Jacques Derrida, we try to think the university situation, and the links between professing, the professor, and the profession. The analysis attempts to synthesize, in a different way

Interesting properties of some iron(II), copper(I) and copper(II ...

Indian Academy of Sciences (India)

Administrator

Tridendate ligands with nitrogen centers, generally well-known as the tripod ligands, have been of considerable interest to inorganic chemists dealing with the preparation of model compounds for hemocyanin, tyrosinase etc. We have found that such ligands when complexed with iron(II) and copper(II) and copper(I) ions ...

Técnica de doble pedículo lateral en reconstrucción mamaria después de tumorectomía Double lateral pedicle technique in breast reconstruction after tumorectomy

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Orlando Rafael Expósito Reyes

2007-12-01

Full Text Available Los tumores mamarios aparecen cada vez con mayor frecuencia, e igualmente las secuelas poco estéticas de la cirugía de estos. Se presenta la técnica quirúrgica de doble pedículo externo (superior e inferior en la reconstrucción mamaria después de una tumorectomía por fibroadenoma gigante de la mama izquierda. Se planificó la intervención tomando como referencia la técnica de Skoog (pedículo lateral externo, por la localización, el área ocupada por la masa mamaria (3/4 partes de la mama y para conservar la irrigación del complejo areola-pezón. Para llenar el vacío dejado por el tumor, se utilizó un segundo pedículo inferolateral que se liberó, rotó y fijó a la fascia muscular, con sutura no absorbible, en el área del cuadrante superior interno, lo cual sirvió de relleno o apoyo al complejo areola-pezón y a su pedículo. Se obtuvo un resultado estético bueno, que satisfizo las expectativas de la paciente y de los médicos, al conservarse la mama y su forma.Breast tumors are more and more frequent, as well as the little aesthetic sequelae of their surgery. The external double pedicle surgical technique (upper and lower in breast reconstruction after a tumorectomy due to giant fibroadenoma of the left breast was presented. The operation was planned taking Skoog’s technique as a reference (external lateral pedicle by the localization, the area occupied by the breast mass (3/4 parts of the breast and to preserve the irrigation of the areola-nipple complex. To fill the gap left by the tumor, it was used a second inferolateral pedicle that was released, rotated and fixed to the muscle fascia with non-absorbable suture in the area of the upper internal quadrant that served as a filling or support to the areola-nipple complex and to its pedicle. A good aesthetic result that satisfied the patients and specialists’ expectations was obtained on conserving the breast and its form.

Zn(II, Mn(II and Sr(II Behavior in a Natural Carbonate Reservoir System. Part I: Impact of Salinity, Initial pH and Initial Zn(II Concentration in Atmospheric Conditions

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Auffray B.

2016-07-01

Full Text Available The sorption of inorganic elements on carbonate minerals is well known in strictly controlled conditions which limit the impact of other phenomena such as dissolution and/or precipitation. In this study, we evidence the behavior of Zn(II (initially in solution and two trace elements, Mn(II and Sr(II (released by carbonate dissolution in the context of a leakage from a CO2 storage site. The initial pH chosen are either equal to the pH of the water-CO2 equilibrium (~ 2.98 or equal to the pH of the water-CO2-calcite system (~ 4.8 in CO2 storage conditions. From this initial influx of liquid, saturated or not with respect to calcite, the batch experiments evolve freely to their equilibrium, as it would occur in a natural context after a perturbation. The batch experiments are carried out on two natural carbonates (from Lavoux and St-Emilion with PCO2 = 10−3.5 bar, with different initial conditions ([Zn(II]i from 10−4 to 10−6 M, either with pure water or 100 g/L NaCl brine. The equilibrium regarding calcite dissolution is confirmed in all experiments, while the zinc sorption evidenced does not always correspond to the two-step mechanism described in the literature. A preferential sorption of about 10% of the concentration is evidenced for Mn(II in aqueous experiments, while Sr(II is more sorbed in saline conditions. This study also shows that this preferential sorption, depending on the salinity, is independent of the natural carbonate considered. Then, the simulations carried out with PHREEQC show that experiments and simulations match well concerning the equilibrium of dissolution and the sole zinc sorption, with log KZn(II ~ 2 in pure water and close to 4 in high salinity conditions. When the simulations were possible, the log K values for Mn(II and Sr(II were much different from those in the literature obtained by sorption in controlled conditions. It is shown that a new conceptual model regarding multiple Trace Elements (TE sorption is

Perovskite phases in the systems Asup(II)O-Usup(VI)O/sub 3/. 2. On the system A/sub 2/sup(II)Bsup(II)Usup(VI)O/sub 6/, with Asup(II), Bsup(II) = Ba, Sr, Ca

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Griffiths, A J; Kemmler-Sack, S [Tuebingen Univ. (Germany, F.R.). Lehrstuhl fuer Anorganische Chemie 2

1980-07-01

Studies on the system A/sub 2/sup(II)Bsup(II)Usup(VI)O/sub 6/ with Asup(II), Bsup(II) = Ba, Sr, Ca or combinations of these have shown that the alkaline earth ions cannot substitute each other in all proportions. The perovskites were studied by X-ray diffraction and vibrational spectroscopic methods. The lattice vibration region of the far infrared spectra proved to be of particular value in providing information on the occupancy of the A and B sites. Analysis of the spectra shows that, in the majority of cases, contary to the geometrical predictions some of the larger alkaline earth ions occupy the six-coordinated B sites and some smaller ions the A positions. The number of ions that take in this A reversible B site-exchange can amount to 20%, but is normally smaller.

The Bipolar II Depression Questionnaire: A Self-Report Tool for Detecting Bipolar II Depression.

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Chi Ming Leung

Full Text Available Bipolar II (BP-II depression is often misdiagnosed as unipolar (UP depression, resulting in suboptimal treatment. Tools for differentiating between these two types of depression are lacking. This study aimed to develop a simple, self-report screening instrument to help distinguish BP-II depression from UP depressive disorder. A prototype BP-II depression questionnaire (BPIIDQ-P was constructed following a literature review, panel discussions and a field trial. Consecutively assessed patients with a diagnosis of depressive disorder or BP with depressive episodes completed the BPIIDQ-P at a psychiatric outpatient clinic in Hong Kong between October and December 2013. Data were analyzed using discriminant analysis and logistic regression. Of the 298 subjects recruited, 65 (21.8% were males and 233 (78.2% females. There were 112 (37.6% subjects with BP depression [BP-I = 42 (14.1%, BP-II = 70 (23.5%] and 182 (62.4% with UP depression. Based on family history, age at onset, postpartum depression, episodic course, attacks of anxiety, hypersomnia, social phobia and agoraphobia, the 8-item BPIIDQ-8 was constructed. The BPIIDQ-8 differentiated subjects with BP-II from those with UP depression with a sensitivity/specificity of 0.75/0.63 for the whole sample and 0.77/0.72 for a female subgroup with a history of childbirth. The BPIIDQ-8 can differentiate BP-II from UP depression at the secondary care level with satisfactory to good reliability and validity. It has good potential as a screening tool for BP-II depression in primary care settings. Recall bias, the relatively small sample size, and the high proportion of females in the BP-II sample limit the generalization of the results.

Mu2e-II Injection from PIP-II

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Neuffer, David [Fermilab

2018-04-26

We discuss injection of 800 MeV proton beam from PIP-II into the production target for Mu2e-II, assuming a targeting and μ production scenario similar to mu2e. The incoming beam trajectory must be modified from the mu2e parameters to match the focusing fields. Adding a vertical deflection at injection enables the injected beam to reach the target. Other differences from the mu2e system must be considered, including changes in the target structure, the radiation shielding and beam dump/absorber. H- beam should be stripped to p+. Other variations are discussed.

Syntheses, spectroscopic and thermal analyses of cyanide bridged heteronuclear polymeric complexes: [M(L)2Ni(CN)4]n (Ldbnd N-methylethylenediamine or N-ethylethylenediamine; Mdbnd Ni(II), Cu(II), Zn(II) or Cd(II))

Science.gov (United States)

Karaağaç, Dursun; Kürkçüoğlu, Güneş Süheyla

2016-02-01

Polymeric tetracyanonickelate(II) complexes of the type [M(L)2Ni(CN)4]n (Ldbnd N-methylethylenediamine (men) or N-ethylethylenediamine (neen); Mdbnd Ni(II), Cu(II), Zn(II) or Cd(II)) have been prepared and characterized by FT-IR, Raman spectroscopy, thermal and elemental analysis techniques. Additionally, FT-IR and Raman spectral analyses of men and neen have experimentally and theoretically investigated in the range of 4000-250 cm-1. The corresponding vibration assignments of men and neen are performed by using B3LYP density functional theory (DFT) method together with 6-31 G(d) basis set. The spectral features of the complexes suggest that the coordination environment of the M(II) ions are surrounded by the two symmetry related men and neen ligands and the two symmetry related N atom of cyanide groups, whereas the Ni(II) atoms are coordinated with a square-planar to four C atoms of the cyanide groups. Polymeric structures of the complexes consist of one dimensional alternative chains of [M(L)2]2+ and [Ni(CN)4]2- moieties. The thermal decompositions in the temperature range 30-700 °C of the complexes were investigated in the static air atmosphere.

Plasma opening switch development for the Particle Beam Fusion Accelerator II (PBFA II)

International Nuclear Information System (INIS)

Stinnett, R.W.; McDaniel, D.H.; Rochau, G.E.

1987-01-01

The authors conducted plasma opening switch (POS) experiments on Sandia National Laboratories' new Particle Beam Fusin Accelerator II (PBFA II) (12 MV, 100 TW, 50 ns), on the Supermite accelerator (2 MV, 2 TW, 50 ns) and on the Naval Research Laboratory's Gamble II accelerator (1.8 MV, 1.6 TW, 70 ns). The POS systems on the PBFA II and Supermite accelerators use a newly developed flashboard plasma source to provide the plasma necessary to conduct the large (> 1 MA) currents produced byu these accelerators. In the Supermite experiments, the plasma opening switch conducted currents up to 1 MA before opening in less than 10 ns into an electron beam load. These experiments achieved significant voltage gain relative to the voltage across a matched load. In experiments on Gamble II, power gains of up to 1.7 were achieved using a POS in a strongly coaxial geometry (r/sub outer//r/sub inner/ = 2) with a large magnetic field at the cathode. The POS system on PBFA II is unique because of its size and voltage. This POS system is designed to conduct over 6 MA before opening. In present experiments it has conducted currents of 4-5 MA for over 50 ns

TBscore II

DEFF Research Database (Denmark)

Rudolf, Frauke; Lemvik, Grethe; Abate, Ebba

2013-01-01

Abstract Background: The TBscore, based on simple signs and symptoms, was introduced to predict unsuccessful outcome in tuberculosis patients on treatment. A recent inter-observer variation study showed profound variation in some variables. Further, some variables depend on a physician assessing...... them, making the score less applicable. The aim of the present study was to simplify the TBscore. Methods: Inter-observer variation assessment and exploratory factor analysis were combined to develop a simplified score, the TBscore II. To validate TBscore II we assessed the association between start...

Beryllium(II), manganese(II) and uranyl(VI)-salicylamide complexes

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Maurya, P L; Agarwala, B V; Dey, A K [Allahabad Univ. (India)

1977-01-01

The preparation, composition, general properties and i.r. absorption spectra of the solid chelates formed by salicylamide with beryllium(II), manganese(II) and uranyl(VI) are described. The complexes have been synthesized by refluxing a mixture of ethanolic solutions of the reactants (metal:ligand :: 1:2) for several hours in the presence of alkali. Attempts to isolate the complexes by the interaction of ethanolic solutions of the metal salts and the ligand in the absence of alkali did not succeed.

Structural analysis of group II chitinase (ChtII) catalysis completes the puzzle of chitin hydrolysis in insects.

Science.gov (United States)

Chen, Wei; Qu, Mingbo; Zhou, Yong; Yang, Qing

2018-02-23

Chitin is a linear homopolymer of N -acetyl-β-d-glucosamines and a major structural component of insect cuticles. Chitin hydrolysis involves glycoside hydrolase family 18 (GH18) chitinases. In insects, chitin hydrolysis is essential for periodic shedding of the old cuticle ecdysis and proceeds via a pathway different from that in the well studied bacterial chitinolytic system. Group II chitinase (ChtII) is a widespread chitinolytic enzyme in insects and contains the greatest number of catalytic domains and chitin-binding domains among chitinases. In Lepidopterans, ChtII and two other chitinases, ChtI and Chi-h, are essential for chitin hydrolysis. Although ChtI and Chi-h have been well studied, the role of ChtII remains elusive. Here, we investigated the structure and enzymology of Of ChtII, a ChtII derived from the insect pest Ostrinia furnacalis We present the crystal structures of two catalytically active domains of Of ChtII, Of ChtII-C1 and Of ChtII-C2, both in unliganded form and complexed with chitooligosaccharide substrates. We found that Of ChtII-C1 and Of ChtII-C2 both possess long, deep substrate-binding clefts with endochitinase activities. Of ChtII exhibited structural characteristics within the substrate-binding cleft similar to those in Of Chi-h and Of ChtI. However, Of ChtII lacked structural elements favoring substrate binding beyond the active sites, including an extra wall structure present in Of Chi-h. Nevertheless, the numerous domains in Of ChtII may compensate for this difference; a truncation containing one catalytic domain and three chitin-binding modules ( Of ChtII-B4C1) displayed activity toward insoluble polymeric substrates that was higher than those of Of Chi-h and Of ChtI. Our observations provide the last piece of the puzzle of chitin hydrolysis in insects. © 2018 by The American Society for Biochemistry and Molecular Biology, Inc.

The Influence of Mg(II and Ca(II Ions on Rutin Autoxidation in Weakly Alkaline Aqueous Solutions

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Živanović Slavoljub C.

2016-09-01

Full Text Available Rutin (quercetin-3-O-rutinoside is one of the most abundant bioflavonoids with various biological and pharmacological activities. Considering the ubiquitous presence of Mg(II and Ca(II ions in biological systems we decided to investigate their influence on the autoxidation of rutin in weakly alkaline aqueous solutions. Changes in UV-Vis spectra recorded during the rutin autoxidation in aqueous solution at pH 8.4 revealed that this process was very slow in the absence of metal ions. The presence of Mg(II and, especially Ca(II ion, increased the transformation rate of rutin. UV-Vis spectra recorded after prolonged autoxidation indicated the formation of humic acidlike products in the presence of Mg(II and Ca(II ions. Four new compounds formed during the initial stage of rutin autoxidation in the presence of Mg(II and Ca(II ions were detected by HPLCDAD. Based on the analysis of their DAD UV-Vis spectra and comparison of their retention times with the retention time value for rutin, we concluded that the initial rutin transformation products were formed by the water addition on double bond in ring C and hydroxylation of ring B. A very small decrease of the initial rutin concentration (4% was observed by HPLC-DAD in the absence of metal ions for the period of 90 minutes. However, rutin concentration decrease was much larger in the presence of Mg(II and Ca(II ions (14% and 24%, respectively. The more pronounced effect of Ca(II ion on the rutin autoxidation may be explained by the stronger binding of Mg(II ion to rutin and thus greater stabilizing effect on reaction intermediates caused by its higher ionic potential (charge/ionic radius ratio in comparison to Ca(II ion. The results of this study may contribute to the better understanding of interactions of Mg(II and Ca(II ions with natural phenolic antioxidants which are important for their various biological activities.

On the ortho-positronium quenching reactions promoted by Fe(II), Fe(III), Co(III), Ni(II), Zn(II) and Cd(II) cyanocomplexes

Science.gov (United States)

Fantola Lazzarini, Anna L.; Lazzarini, Ennio

The o-Ps quenching reactions promoted in aqueous solutions by the following six cyanocomplexes: [Fe(CN) 6] 4-; [Co(CN) 6] 3-; [Zn(CN) 4] 2-; [Cd(CN) 6] 2-; [Fe(CN) 6] 3-; [Ni(CN) 4] 2- were investigated. The first four reactions probably consist in o-Ps addition across the CN bond, their rate constants at room temperature, Tr, being ⩽(0.04±0.02) × 10 9 M -1 s -1, i.e. almost at the limit of experimental errors. The rate constant of the fifth reaction, in o-Ps oxydation, at Tr is (20.3±0.4) × 10 9 M -1 s -1. The [Ni(CN) 4] 2-k value at Tr, is (0.27±0.01) × 10 9 M -1 s -1, i.e. 100 times less than the rate constants of o-Ps oxydation, but 10 times larger than those of the o-Ps addition across the CN bond. The [Ni(CN) 4] 2- reaction probably results in formation of the following positronido complex: [Ni(CN) 4Ps] 2-. However, it is worth noting that the existence of such a complex is only indirectly deduced. In fact it arises from comparison of the [Ni(CN) 4] 2- rate constant with those of the Fe(II), Zn(II), Cd(II), and Co(III) cyanocomplexes, which, like the Ni(II) cyanocomplex, do not promote o-Ps oxydation or spin exchange reactions.

International Literature Review on WHODAS II (World Health Organization Disability Assessment Schedule II

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Federici, Stefano

2009-06-01

Full Text Available This review is a critical analysis regarding the study and utilization of the World Health Organization Disability Assessment Schedule II (WHODAS II as a basis for establishing specific criteria for evaluating relevant international scientific literature.The WHODAS II is an instrument developed by the World Health Organisation in order to assess behavioural limitations and restrictions related to an individual’s participation, independent from a medical diagnosis. This instrument was developed by the WHO’s Assessment, Classification and Epidemiology Group within the framework of the WHO/NIH Joint Project on Assessment and Classification of Disablements. To ascertain the international dissemination level of for WHODAS II’s utilization and, at the same time, analyse the studies regarding the psychometric validation of the WHODAS II translation and adaptation in other languages and geographical contests. Particularly, our goal is to highlight which psychometric features have been investigated, focusing on the factorial structure, the reliability, and the validity of this instrument. International literature was researched through the main data bases of indexed scientific production: the Cambridge Scientific Abstracts – CSA, PubMed, and Google Scholar, from 1990 through to December 2008.The following search terms were used:“whodas”, in the field query, plus “title” and “abstract”.The WHODAS II has been used in 54 studies, of which 51 articles are published in international journals, 2 conference abstracts, and one dissertation abstract. Nevertheless, only 7 articles are published in journals and conference proceedings regarding disability and rehabilitation. Others have been published in medical and psychiatric journals, with the aim of indentifying comorbidity correlations in clinical diagnosis concerning patients with mental illness. Just 8 out of 51 articles have studied the psychometric properties of the WHODAS II. The

Linac Coherent Light Source II (LCLS-II) Conceptual Design Report

International Nuclear Information System (INIS)

Stohr, J.

2011-01-01

The LCLS-II Project is designed to support the DOE Office of Science mission, as described in the 22 April 2010 Mission Need Statement. The scope of the Project was chosen to provide an increase in capabilities and capacity for the facility both at project completion in 2017 and in the subsequent decade. The Project is designed to address all points of the Mission Need Statement (MNS): (1) Expanded spectral reach; (2) Capability to provide x-ray beams with controllable polarization; (3) Capability to provide 'pump' pulses over a vastly extended range of photon energies to a sample, synchronized to LCLS-II x-ray probe pulses with controllable inter-pulse time delay; and (4) Increase of user access through parallel rather than serial x-ray beam use within the constraint of a $300M-$400M Total Project Cost (TPC) range. The LCLS-II Project will construct: (1) A hard x-ray undulator source (2-13 keV); (2) A soft x-ray undulator source (250-2,000 eV); (3) A dedicated, independent electron source for these new undulators, using sectors 10-20 of the SLAC linac; (4) Modifications to existing SLAC facilities for the injector and new shielded enclosures for the undulator sources, beam dumps and x-ray front ends; (5) A new experiment hall capable of accommodating four experiment stations; and (6) Relocation of the two soft x-ray instruments in the existing Near Experiment Hall (NEH) to the new experiment hall (Experiment Hall-II). A key objective of LCLS-II is to maintain near-term international leadership in the study of matter on the fundamental atomic length scale and the associated ultrafast time scales of atomic motion and electronic transformation. Clearly, such studies promise scientific breakthroughs in key areas of societal needs like energy, environment, health and technology, and they are uniquely enabled by forefront X-ray Free Electron Laser (X-FEL) facilities. While the implementation of LCLS-II extends to about 2017, it is important to realize that LCLS-II only

Predictive value of SAPS II and APACHE II scoring systems for patient outcome in a medical intensive care unit

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Amina Godinjak

2016-11-01

Full Text Available Objective. The aim is to determine SAPS II and APACHE II scores in medical intensive care unit (MICU patients, to compare them for prediction of patient outcome, and to compare with actual hospital mortality rates for different subgroups of patients. Methods. One hundred and seventy-four patients were included in this analysis over a oneyear period in the MICU, Clinical Center, University of Sarajevo. The following patient data were obtained: demographics, admission diagnosis, SAPS II, APACHE II scores and final outcome. Results. Out of 174 patients, 70 patients (40.2% died. Mean SAPS II and APACHE II scores in all patients were 48.4±17.0 and 21.6±10.3 respectively, and they were significantly different between survivors and non-survivors. SAPS II >50.5 and APACHE II >27.5 can predict the risk of mortality in these patients. There was no statistically significant difference in the clinical values of SAPS II vs APACHE II (p=0.501. A statistically significant positive correlation was established between the values of SAPS II and APACHE II (r=0.708; p=0.001. Patients with an admission diagnosis of sepsis/septic shock had the highest values of both SAPS II and APACHE II scores, and also the highest hospital mortality rate of 55.1%. Conclusion. Both APACHE II and SAPS II had an excellent ability to discriminate between survivors and non-survivors. There was no significant difference in the clinical values of SAPS II and APACHE II. A positive correlation was established between them. Sepsis/septic shock patients had the highest predicted and observed hospital mortality rate.

Foam separation of Cu (II) and Ni(II) from aqueous solutions and simulated wastewaters

International Nuclear Information System (INIS)

Shakir, K.; Beheir, Sh.G.; Aziz, M.

2003-01-01

Batch experiments on the removal of Cu(II) and Ni(II) from aqueous solutions were performed through two foam separation techniques: precipitate flotation (PTF) an adsorbing colloid flotation (ACF). In ACF, Fe(III), oxyhydroxide was used as co precipitant and/or adsorbing colloid and sodium lauryl sulfate was used as a collector. ACF required a lower collector concentration than PTF. foreign ions were found to decrease the percent removal, the extent of decrease being higher by divalent ions than that by monovalent ones. However, the percent removal could be improved, even in presence of foreign ions, by addition of Al(II) as an activator. High removals could be attained for Cu(II) and Ni(II) from simulated wastewaters containing different concentrations of both metal ions. The addition of concentrations below the limits recommended by the egyptian regulations for environmental discharge

Serum insulin-like growth factor II (IGF-II) and adrenomedullin (ADM) in coronary heart disease

International Nuclear Information System (INIS)

Tong Lijun; Ji Naijun; Fan Bifu; Wang Chengyao; Mei Yibin; Chen Donghai; Li Fuyuan

2005-01-01

Objective: To investigate the changes of serum insulin-like growth factor (IGF-II) and adrenomedullin (ADM) levels in patients with coronary heart disease (CHD). Methods: Serum IGF-II and ADM levels were measured with RIA in 90 CHD patients and 40 controls. Results: Serum IGF-II and ADM levels were significantly higher in CHD patients than those in controls (P 0.05). Serum IGF-II and ADM levels were significantly higher in the patients complicated with myocardial infarction (MI) than those in patients without this complication (t=2.831, t=2.328, both P 0.05). Conclusion: Serum IGF-II and ADM levels were increased in CHD patients, most markedly in those complicated with MI. (authors)

Spiral chain structure of high pressure selenium-II' and sulfur-II from powder x-ray diffraction

International Nuclear Information System (INIS)

Fujihisa, Hiroshi; Yamawaki, Hiroshi; Sakashita, Mami; Yamada, Takahiro; Honda, Kazumasa; Akahama, Yuichi; Kawamura, Haruki; Le Bihan, Tristan

2004-01-01

The structure of high pressure phases, selenium-II ' (Se-II ' ) and sulfur-II (S-II), for α-Se 8 (monoclinic Se-I) and α-S 8 (orthorhombic S-I) was studied by powder x-ray diffraction experiments. Se-II ' and S-II were found to be isostructural and to belong to the tetragonal space group I4 1 /acd, which is made up of 16 atoms in the unit cell. The structure consisted of unique spiral chains with both 4 1 and 4 3 screws. The results confirmed that the structure sequence of the pressure-induced phase transitions for the group VIb elements depended on the initial molecular form. The chemical bonds of the phases are also discussed from the interatomic distances that were obtained

Digital logic circuit design with ALTERA Quartus II

International Nuclear Information System (INIS)

Lee, Seung Ho

2009-09-01

This book consists 31 chapters about digital logic circuit with ALTERA Quartus II. It includes the introduction of ALTERA Quartus II, ALTERA Quartus II schematic editor, ALTERA Quartus II compiler, ALTERA Quartus II simulator, ALTERA Quartus II timing analyzer, how to use HBE-COMBO II training and HBE-COMBO II training kit with schematic editor, VHDL grammar and practice of ALTERA Quartus II and HBE-COMBO II training kit with VHDL.

Dust in H II regions

International Nuclear Information System (INIS)

Isobe, S.

1977-01-01

Several pieces of evidence indicate that H II regions may contain dust: 1) the continuum light scattered by dust grains (O'Dell and Hubbard, 1965), 2) thermal radiation from dust grains at infrared wavelengths (Ney and Allen, 1969), 3) the abnormal helium abundance in some H II regions (Peimbert and Costero, 1969), etc. Although observations of the scattered continuum suggest that the H II region cores may be dust-free, dust grains and gas must be well mixed in view of the infrared observations. This difficulty may be solved by introducing globules with sizes approximately 0.001 pc. These globules and the molecular clouds adjacent to H II regions are the main sources supplying dust to H II regions. (Auth.)

Derivation of electron density and temperature from (S II) and (O II) line intensity ratios

Energy Technology Data Exchange (ETDEWEB)

Canto, J; Meaburn, J; Theokas, A C [Manchester Univ. (UK). Dept of Astronomy; Elliott, K H [Anglo-Australian Observatory, Epping (Australia)

1980-12-01

Line intensity ratios for (S II) and (O II) due to collisional de-excitation are briefly discussed. Comparison is made between various reaction rate parameters presented by separate investigators. Included are observations of ratios obtained from the Orion nebula which experimentally confirm the reaction rates of Pradhan as best representing the observed distribution of these ratios. (O II) and (S II) contour plots are also presented, which allow effective electron temperatures and densities to be estimated from pairs of line ratios.

SPECIATION OF BINARY COMPLEXES OF Pb(II) AND Cd(II) WITH ...

African Journals Online (AJOL)

ABSTRACT. Chemical speciation of L-Asparagine complexes of Pb(II) and Cd(II) in presence of (0-50% v/v) dimethyl sulfoxide(DMSO)-water mixtures has been studied potentiometrically at 303.0 K and at an ionic strength of 0.16 mol L-1. The models containing different number of species were refined by using the ...

Structural properties of MHC class II ligands, implications for the prediction of MHC class II epitopes.

Directory of Open Access Journals (Sweden)

Kasper Winther Jørgensen

2010-12-01

Full Text Available Major Histocompatibility class II (MHC-II molecules sample peptides from the extracellular space allowing the immune system to detect the presence of foreign microbes from this compartment. Prediction of MHC class II ligands is complicated by the open binding cleft of the MHC class II molecule, allowing binding of peptides extending out of the binding groove. Furthermore, only a few HLA-DR alleles have been characterized with a sufficient number of peptides (100-200 peptides per allele to derive accurate description of their binding motif. Little work has been performed characterizing structural properties of MHC class II ligands. Here, we perform one such large-scale analysis. A large set of SYFPEITHI MHC class II ligands covering more than 20 different HLA-DR molecules was analyzed in terms of their secondary structure and surface exposure characteristics in the context of the native structure of the corresponding source protein. We demonstrated that MHC class II ligands are significantly more exposed and have significantly more coil content than other peptides in the same protein with similar predicted binding affinity. We next exploited this observation to derive an improved prediction method for MHC class II ligands by integrating prediction of MHC- peptide binding with prediction of surface exposure and protein secondary structure. This combined prediction method was shown to significantly outperform the state-of-the-art MHC class II peptide binding prediction method when used to identify MHC class II ligands. We also tried to integrate N- and O-glycosylation in our prediction methods but this additional information was found not to improve prediction performance. In summary, these findings strongly suggest that local structural properties influence antigen processing and/or the accessibility of peptides to the MHC class II molecule.

A metal-organic framework nanocomposite made from functionalized magnetite nanoparticles and HKUST-1 (MOF-199) for preconcentration of Cd(II), Pb(II), and Ni(II)

International Nuclear Information System (INIS)

Ghorbani-Kalhor, Ebrahim

2016-01-01

The author describes the preparation of a magnetic metal organic framework of type MOF-199 containing magnetite (Fe 3 O 4 ) nanoparticles carrying covalently immobilized 4-(thiazolylazo) resorcinol (Fe 3 O 4 -TAR). This material is shown to represent a viable sorbent for separation and preconcentration of Cd(II), Pb(II), and Ni(II) ions. Box-Behnken design was applied to optimize the parameters affecting preconcentration. Following elution with 0.6 mol L −1 EDTA, the ions were quantified by FAAS. The capacity of the sorbent ranged between 185 and 210 mg g −1 . The limits of detection are 0.15, 0.40, and 0.8 ng mL −1 for Cd(II), Ni(II), and Pb(II) ions, respectively. The relative standard deviations are <8.5 %. The method was successfully applied to the rapid extraction of trace amounts of these ions from sea food and agri food. (author)

Differential Effect of Solution Conditions on the Conformation of the Actinoporins Sticholysin II and Equinatoxin II

Directory of Open Access Journals (Sweden)

EDSON V.F. FAUTH

2014-12-01

Full Text Available Actinoporins are a family of pore-forming proteins with hemolytic activity. The structural basis for such activity appears to depend on their correct folding. Such folding encompasses a phosphocholine binding site, a tryptophan-rich region and the activity-related N-terminus segment. Additionally, different solution conditions are known to be able to influence the pore formation by actinoporins, as for Sticholysin II (StnII and Equinatoxin II (EqtxII. In this context, the current work intends to characterize the influence of distinct solution conditions in the conformational behavior of these proteins through molecular dynamics (MD simulations. The obtained data offer structural insights into actinoporins dynamics in solution, characterizing its conformational behavior at the atomic level, in accordance with previous experimental data on StnII and EqtxII hemolytic activities.

The influence of Fe(II) competition on the sorption and migration of Ni(II) in MX-80 bentonite

International Nuclear Information System (INIS)

Pfingsten, Wilfried; Bradbury, Mike; Baeyens, Bart

2011-01-01

Highlights: → We model the diffusion of Ni(II) through bentonite using different sorption models. → We examine sorption competition of Fe(II) and Ni(II) at different concentrations. → Ni(II) breakthrough is 15 times earlier with Fe(II) sorption competition. → Ni(II) sorption is non-linear and depends on the Fe(II) concentration levels. → Sorption competition is important and has to be modelled by reactive transport codes. - Abstract: The results from batch sorption experiments on montmorillonite systems have demonstrated that bivalent transition metals compete with one another for sorption sites. For safety analysis studies of high level radioactive waste repositories with compacted bentonite near fields, the importance of competitive sorption on the migration of radionuclides needs to be evaluated. Under reducing conditions, the bentonite porewater chosen has a Fe(II) concentration of ∼5.3 x 10 -5 M through saturation with siderite. The purpose of this paper is to assess the influence of such high Fe(II) concentrations on the transport of Ni(II) through compacted bentonite, Ni(II) was chosen as an example of a bivalent transition metal. The one-dimensional calculations were carried out at different Ni(II) equilibrium concentrations at the boundary (Ni(II) EQBM ) with the reactive transport code MCOTAC incorporating the two site protolysis non electrostatic surface complexation/cation exchange sorption model, MCOTAC-sorb. At a Ni(II) EQBM level of 10 -7 M without Fe(II) competition, the reactive transport calculations using a constant K d approach and the MCOTAC-sorb calculation yielded the same breakthrough curves. At higher Ni(II) EQBM (10 -5 M), the model calculations with MCOTAC-sorb indicated a breakthrough which was shifted to later times by a factor of ∼5 compared with the use of the constant K d approach. When sorption competition was included in the calculations, the magnitude of the influence depended on the sorption characteristics of the

Current status of experimental breeder reactor-II [EBR-II] shutdown planning

International Nuclear Information System (INIS)

McDermott, M. D.; Griffin, C. D.; Michelbacher, J. A.; Earle, O. K.

2000-01-01

The Experimental Breeder Reactor--II (EBR-II) at Argonne National Laboratory--West (ANL-W) in Idaho, was shutdown in September, 1994 as mandated by the US Department of Energy. This sodium cooled reactor had been in service since 1964, and was to be placed in an industrially and radiologically safe condition for ultimate decommissioning. The deactivation of a liquid metal reactor presents unique concerns. The first major task associated with the project was the removal of all fueled assemblies. In addition, sodium must be drained from systems and processed for ultimate disposal. Residual quantities of sodium remaining in systems must be deactivated or inerted to preclude future hazards associated with pyrophoricity and generation of potentially explosive hydrogen gas. A Sodium Process Facility was designed and constructed to react the elemental sodium from the EBR-II primary and secondary systems to sodium hydroxide for disposal. This facility has a design capacity to allow the reaction of the complete inventory of sodium at ANL-W in less than two years. Additional quantities of sodium from the Fermi-1 reactor are also being treated at the Sodium Process Facility. The sodium environment and the EBR-II configuration, combined with the radiation and contamination associated with thirty years of reactor operation, posed problems specific to liquid metal reactor deactivation. The methods being developed and implemented at EBR-II can be applied to other similar situations in the US and abroad

Gas dynamics of H II regions. II. Two-dimensional axisymmetric calculations

International Nuclear Information System (INIS)

Bodenheimer, P.; Tenorio-Tagle, G.; Yorke, H.W.

1979-01-01

The evolution of H II regions is calculated with a two-dimensional hydrodynamic numerical procedure under the assumption that the exciting star is born within a cool molecular cloud whose density is about 10 3 particles cm -3 . As the ionization of the cloud's edge is completed, a large pressure gradient is set up and ionized cloud material expands into the ionized low-density (1 particle cm -3 ) intercloud medium, with velocities larger than 30 km s -1 .The calculations are made under the simplifying assumptions that (i) within the H II region, ionization equilibrium holds at all times, (ii) the ionization front is a discontinuity, thus its detailed structure is not calculated, (iii) the temperature of each region (H II region, neutral cloud, and intercloud medium) is constant in time, (iv) all ionizing photons come radially from the exciting star. Four cases are calculated and compared with observations: (1) the edge of the cloud is overrun by a supersonic ionization front, (2) the initial Stroemgren sphere surrounding the star lies deep inside the cloud, thus the cloud's edge is ionized by a subsonic ionization front, (3) the ionization front breaks through two opposite faces of the same cloud simultaneously, (4) the flow encounters an isolated globule of density 10 3 particles cm -3 shortly after emerging from the molecular cloud.The phenomena here considered show how evolving H II regions are an important input of kinetic energy to the interstellar medium

Linac Coherent Light Source II (LCLS-II) Conceptual Design Report

Energy Technology Data Exchange (ETDEWEB)

Stohr, J

2011-11-16

The LCLS-II Project is designed to support the DOE Office of Science mission, as described in the 22 April 2010 Mission Need Statement. The scope of the Project was chosen to provide an increase in capabilities and capacity for the facility both at project completion in 2017 and in the subsequent decade. The Project is designed to address all points of the Mission Need Statement (MNS): (1) Expanded spectral reach; (2) Capability to provide x-ray beams with controllable polarization; (3) Capability to provide 'pump' pulses over a vastly extended range of photon energies to a sample, synchronized to LCLS-II x-ray probe pulses with controllable inter-pulse time delay; and (4) Increase of user access through parallel rather than serial x-ray beam use within the constraint of a $300M-$400M Total Project Cost (TPC) range. The LCLS-II Project will construct: (1) A hard x-ray undulator source (2-13 keV); (2) A soft x-ray undulator source (250-2,000 eV); (3) A dedicated, independent electron source for these new undulators, using sectors 10-20 of the SLAC linac; (4) Modifications to existing SLAC facilities for the injector and new shielded enclosures for the undulator sources, beam dumps and x-ray front ends; (5) A new experiment hall capable of accommodating four experiment stations; and (6) Relocation of the two soft x-ray instruments in the existing Near Experiment Hall (NEH) to the new experiment hall (Experiment Hall-II). A key objective of LCLS-II is to maintain near-term international leadership in the study of matter on the fundamental atomic length scale and the associated ultrafast time scales of atomic motion and electronic transformation. Clearly, such studies promise scientific breakthroughs in key areas of societal needs like energy, environment, health and technology, and they are uniquely enabled by forefront X-ray Free Electron Laser (X-FEL) facilities. While the implementation of LCLS-II extends to about 2017, it is important to realize that

EBR-II Data Digitization

Energy Technology Data Exchange (ETDEWEB)

Yoon, Su-Jong [Idaho National Lab. (INL), Idaho Falls, ID (United States); Rabiti, Cristian [Idaho National Lab. (INL), Idaho Falls, ID (United States); Sackett, John [Idaho National Lab. (INL), Idaho Falls, ID (United States)

2014-08-01

1. Objectives To produce a validation database out of those recorded signals it will be necessary also to identify the documents need to reconstruct the status of reactor at the time of the beginning of the recordings. This should comprehends the core loading specification (assemblies type and location and burn-up) along with this data the assemblies drawings and the core drawings will be identified. The first task of the project will be identify the location of the sensors, with respect the reactor plant layout, and the physical quantities recorded by the Experimental Breeder Reactor-II (EBR-II) data acquisition system. This first task will allow guiding and prioritizing the selection of drawings needed to numerically reproduce those signals. 1.1 Scopes and Deliverables The deliverables of this project are the list of sensors in EBR-II system, the identification of storing location of those sensors, identification of a core isotopic composition at the moment of the start of system recording. Information of the sensors in EBR-II reactor system was summarized from the EBR-II system design descriptions listed in Section 1.2.

El criterio del pago efectivo a la luz del Derecho de la Unión Europea

OpenAIRE

Soler Roch, María Teresa

2013-01-01

Tomando como referencia el tema objeto de la sentencia del TJUE de 2 de abril de 2010 (asunto C-157/10, en el caso BBVA), el presente artículo reflexiona sobre el criterio del pago efectivo del impuesto en el Estado de la fuente —adoptado por la legislación española y en una mayoría de los Convenios de doble imposición— como exigencia para aplicar la deducción por doble imposición internacional en el Estado de residencia. Para ello, el artículo reflexiona sobre las cláusulas tax sparing como ...

How to accurately estimate BH masses of AGN with double-peaked emission lines

OpenAIRE

Xue Guang Zhang; Deborah Dultzin; Ting Gui Wang

2008-01-01

Presentamos una nueva relación para determinar la masa virial del Agujero Negro central en Núcleos Activos de Galaxias con perfiles de doble pico en las líneas anchas de baja ionización. Se discute cuál es el parámetro adecuado para estimar la velocidad local de las regiones de emisión y la relación para estimar la distancia de éstas regiones a la fuente de ionización. Seleccionamos 17 objetos con perfiles de doble pico del SDSS y con líneas de absorción medibles para determinar las masas...

The Belle II Experiment

CERN Document Server

Kahn, J

2017-01-01

Set to begin data taking at the end of 2018, the Belle II experiment is the next-generation B-factory experiment hosted at KEK in Tsukuba, Japan. The experiment represents the cumulative effort from the collaboration of experimental and detector physics, computing, and software development. Taking everything learned from the previous Belle experiment, which ran from 1998 to 2010, Belle II aims to probe deeper than ever before into the field of heavy quark physics. By achieving an integrated luminosity of 50 ab−1 and accumulating 50 times more data than the previous experiment across its lifetime, along with a rewritten analysis framework, the Belle II experiment will push the high precision frontier of high energy physics. This paper will give an overview of the key components and development activities that make the Belle II experiment possible.

Digital optical computer II

Science.gov (United States)

Guilfoyle, Peter S.; Stone, Richard V.

1991-12-01

OptiComp is currently completing a 32-bit, fully programmable digital optical computer (DOC II) that is designed to operate in a UNIX environment running RISC microcode. OptiComp's DOC II architecture is focused toward parallel microcode implementation where data is input in a dual rail format. By exploiting the physical principals inherent to optics (speed and low power consumption), an architectural balance of optical interconnects and software code efficiency can be achieved including high fan-in and fan-out. OptiComp's DOC II program is jointly sponsored by the Office of Naval Research (ONR), the Strategic Defense Initiative Office (SDIO), NASA space station group and Rome Laboratory (USAF). This paper not only describes the motivational basis behind DOC II but also provides an optical overview and architectural summary of the device that allows the emulation of any digital instruction set.

TYPE II-P SUPERNOVAE FROM THE SDSS-II SUPERNOVA SURVEY AND THE STANDARDIZED CANDLE METHOD

International Nuclear Information System (INIS)

D'Andrea, Chris B.; Sako, Masao; Dilday, Benjamin; Jha, Saurabh; Frieman, Joshua A.; Kessler, Richard; Holtzman, Jon; Konishi, Kohki; Yasuda, Naoki; Schneider, D. P.; Sollerman, Jesper; Wheeler, J. Craig; Cinabro, David; Nichol, Robert C.; Lampeitl, Hubert; Smith, Mathew; Atlee, David W.; Bassett, Bruce; Castander, Francisco J.; Goobar, Ariel

2010-01-01

We apply the Standardized Candle Method (SCM) for Type II Plateau supernovae (SNe II-P), which relates the velocity of the ejecta of a SN to its luminosity during the plateau, to 15 SNe II-P discovered over the three season run of the Sloan Digital Sky Survey-II Supernova Survey. The redshifts of these SNe-0.027 0.01) as all of the current literature on the SCM combined. We find that the SDSS SNe have a very small intrinsic I-band dispersion (0.22 mag), which can be attributed to selection effects. When the SCM is applied to the combined SDSS-plus-literature set of SNe II-P, the dispersion increases to 0.29 mag, larger than the scatter for either set of SNe separately. We show that the standardization cannot be further improved by eliminating SNe with positive plateau decline rates, as proposed in Poznanski et al. We thoroughly examine all potential systematic effects and conclude that for the SCM to be useful for cosmology, the methods currently used to determine the Fe II velocity at day 50 must be improved, and spectral templates able to encompass the intrinsic variations of Type II-P SNe will be needed.

Expression Profiles of Cellular Retinol-binding Protein, Type II (CRBP II in Erlang Mountainous Chickens

Directory of Open Access Journals (Sweden)

H. D. Yin

2014-03-01

Full Text Available Cellular retinol-binding protein II (CRBP II belongs to the family of cellular retinol-binding proteins and plays a major role in absorption, transport, and metabolism of vitamin A. In addition, because vitamin A is correlated with reproductive performance, we measured CRBP II mRNA abundance in erlang mountainous chickens by real-time PCR using the relative quantification method. The expression of CRBP II showed a tissue-specific pattern and egg production rate-dependent changes. The expression was very high (p<0.05 in jejunum and liver, intermediate in kidney, ovary, and oviduct, and lowest (p<0.05 in heart, hypothalamus, and pituitary. In the hypothalamus, oviduct, ovary, and pituitary, CRBP II mRNA abundance were correlated to egg production rate, which increased from 12 wk to 32 wk, peaked at 32 wk relative to the other time points, and then decreased from 32 wk to 45 wk. In contrast, the expression of CRBP II mRNA in heart, jejunum, kidney, and liver was not different at any of the ages evaluated in this study. These data may help to understand the genetic basis of vitamin A metabolism, and suggest that CRBP II may be a candidate gene to affect egg production traits in chickens.

Nsls-II Boster

Science.gov (United States)

Gurov, S. M.; Akimov, A. V.; Akimov, V. E.; Anashin, V. V.; Anchugov, O. V.; Baranov, G. N.; Batrakov, A. M.; Belikov, O. V.; Bekhtenev, E. A.; Blum, E.; Bulatov, A. V.; Burenkov, D. B.; Cheblakov, P. B.; Chernyakin, A. D.; Cheskidov, V. G.; Churkin, I. N.; Davidsavier, M.; Derbenev, A. A.; Erokhin, A. I.; Fliller, R. P.; Fulkerson, M.; Gorchakov, K. M.; Ganetis, G.; Gao, F.; Gurov, D. S.; Hseuh, H.; Hu, Y.; Johanson, M.; Kadyrov, R. A.; Karnaev, S. E.; Karpov, G. V.; Kiselev, V. A.; Kobets, V. V.; Konstantinov, V. M.; Kolmogorov, V. V.; Korepanov, A. A.; Kramer, S.; Krasnov, A. A.; Kremnev, A. A.; Kuper, E. A.; Kuzminykh, V. S.; Levichev, E. B.; Li, Y.; Long, J. De; Makeev, A. V.; Mamkin, V. R.; Medvedko, A. S.; Meshkov, O. I.; Nefedov, N. B.; Neyfeld, V. V.; Okunev, I. N.; Ozaki, S.; Padrazo, D.; Petrov, V. V.; Petrichenkov, M. V.; Philipchenko, A. V.; Polyansky, A. V.; Pureskin, D. N.; Rakhimov, A. R.; Rose, J.; Ruvinskiy, S. I.; Rybitskaya, T. V.; Sazonov, N. V.; Schegolev, L. M.; Semenov, A. M.; Semenov, E. P.; Senkov, D. V.; Serdakov, L. E.; Serednyakov, S. S.; Shaftan, T. V.; Sharma, S.; Shichkov, D. S.; Shiyankov, S. V.; Shvedov, D. A.; Simonov, E. A.; Singh, O.; Sinyatkin, S. V.; Smaluk, V. V.; Sukhanov, A. V.; Tian, Y.; Tsukanova, L. A.; Vakhrushev, R. V.; Vobly, P. D.; Utkin, A. V.; Wang, G.; Wahl, W.; Willeke, F.; Yaminov, K. R.; Yong, H.; Zhuravlev, A.; Zuhoski, P.

The National Synchrotron Light Source II is a third generation light source, which was constructed at Brookhaven National Laboratory. This project includes a highly-optimized 3 GeV electron storage ring, linac preinjector, and full-energy synchrotron injector. Budker Institute of Nuclear Physics built and delivered the booster for NSLS-II. The commissioning of the booster was successfully completed. This paper reviews fulfilled work by participants.

Neuroprotective Effects and Mechanisms of Curcumin-Cu(II) and -Zn(II) Complexes Systems and Their Pharmacological Implications.

Science.gov (United States)

Yan, Fa-Shun; Sun, Jian-Long; Xie, Wen-Hai; Shen, Liang; Ji, Hong-Fang

2017-12-28

Alzheimer's disease (AD) is the main form of dementia and has a steadily increasing prevalence. As both oxidative stress and metal homeostasis are involved in the pathogenesis of AD, it would be interesting to develop a dual function agent, targeting the two factors. Curcumin, a natural compound isolated from the rhizome of Curcuma longa , is an antioxidant and can also chelate metal ions. Whether the complexes of curcumin with metal ions possess neuroprotective effects has not been evaluated. Therefore, the present study was designed to investigate the protective effects of the complexes of curcumin with Cu(II) or Zn(II) on hydrogen peroxide (H₂O₂)-induced injury and the underlying molecular mechanisms. The use of rat pheochromocytoma (PC12) cells, a widely used neuronal cell model system, was adopted. It was revealed that curcumin-Cu(II) complexes systems possessed enhanced O₂ ·- -scavenging activities compared to unchelated curcumin. In comparison with unchelated curcumin, the protective effects of curcumin-Cu(II) complexes systems were stronger than curcumin-Zn(II) system. Curcumin-Cu(II) or -Zn(II) complexes systems significantly enhanced the superoxide dismutase, catalase, and glutathione peroxidase activities and attenuated the increase of malondialdehyde levels and caspase-3 and caspase-9 activities, in a dose-dependent manner. The curcumin-Cu(II) complex system with a 2:1 ratio exhibited the most significant effect. Further mechanistic study demonstrated that curcumin-Cu(II) or -Zn(II) complexes systems inhibited cell apoptosis via downregulating the nuclear factor κB (NF-κB) pathway and upregulating Bcl-2/Bax pathway. In summary, the present study found that curcumin-Cu(II) or -Zn(II) complexes systems, especially the former, possess significant neuroprotective effects, which indicates the potential advantage of curcumin as a promising agent against AD and deserves further study.

Spin Crossover in Fe(II)-M(II) Cyanoheterobimetallic Frameworks (M = Ni, Pd, Pt) with 2-Substituted Pyrazines.

Science.gov (United States)

Kucheriv, Olesia I; Shylin, Sergii I; Ksenofontov, Vadim; Dechert, Sebastian; Haukka, Matti; Fritsky, Igor O; Gural'skiy, Il'ya A

2016-05-16

Discovery of spin-crossover (SCO) behavior in the family of Fe(II)-based Hofmann clathrates has led to a "new rush" in the field of bistable molecular materials. To date this class of SCO complexes is represented by several dozens of individual compounds, and areas of their potential application steadily increase. Starting from Fe(2+), square planar tetracyanometalates M(II)(CN)4(2-) (M(II) = Ni, Pd, Pt) and 2-substituted pyrazines Xpz (X = Cl, Me, I) as coligands we obtained a series of nine new Hofmann clathrate-like coordination frameworks. X-ray diffraction reveals that in these complexes Fe(II) ion has a pseudo-octahedral coordination environment supported by four μ4-tetracyanometallates forming its equatorial coordination environment. Depending on the nature of X and M, axial positions are occupied by two 2X-pyrazines (X = Cl and M(II) = Ni (1), Pd (2), Pt (3); X = Me and M(II) = Ni (4), Pd (5)) or one 2X-pyrazine and one water molecule (X = I and M(II) = Ni (7), Pd (8), Pt (9)), or, alternatively, two distinct Fe(II) positions with either two pyrazines or two water molecules (X = Me and M(II) = Pt (6)) are observed. Temperature behavior of magnetic susceptibility indicates that all compounds bearing FeN6 units (1-6) display cooperative spin transition, while Fe(II) ions in N5O or N4O2 surrounding are high spin (HS). Structural changes in the nearest Fe(II) environment upon low-spin (LS) to HS transition, which include ca. 10% Fe-N distance increase, lead to the cell expansion. Mössbauer spectroscopy is used to characterize the spin state of all HS, LS, and intermediate phases of 1-9 (see abstract figure). Effects of a pyrazine substituent and M(II) nature on the hyperfine parameters in both spin states are established.

The synthesis and characterization of 1,2-dihydroxyimino-3,6-di-aza-8,9-O-iso-butylidene nonane and its complexes with Ni(II), Cu(II), Zn(II) and Cd(II)

International Nuclear Information System (INIS)

Canpolat, E.; Kaya, M.; Gorgulu, A.O.

2002-01-01

1,2-dihydroxyimino-3,6-di-aza-8,9-O-iso-butylidene nonane (H 2 L) was synthesized starting from 1,2-O-iso-butylidene-4-aza-6-amino hexane (RNH 2 ) and antichloroglyoxime. Ni(II) and Cu(II) complexes of H 2 L have a metal:ligand ratio 1:2 and the ligand coordinates through two N atoms, as do most of the vic-dioximes. However, Zn(II) and Cd(II) complexes of H 2 L have a metal: ligand ratio 1:1 and one chloride ion and one water molecule are also coordinated to the metal ion. Structures of the ligand and its transition-metal complexes are proposed, according to elemental analysis, IR, 13 C and 1 H NMR spectra, magnetic susceptibility measurements and thermogravimetric analyses (TGA). (author)

High precision measurements of hyperfine structure in Tm II, N2+ and Sc II

International Nuclear Information System (INIS)

Mansour, N.B.; Dinneen, T.P.; Young, L.

1988-01-01

We have applied the technique of collinear fast-ion-beam laser spectroscopy to measure the hyperfine structure (hfs) in Sc II, Tm II and N 2 + . Laser induced fluorescence was observed from a 50 keV ion beam which was superimposed with the output of an actively stabilized ring dye laser (rms bandwidth 2 and the excited 3d4p configuration of Sc II and in the 4f 13 6s and 4f 13 5d configurations of the Tm II. The fine and hyperfine structure of N 2 + has been observed in the (0,1) and (1,2) band of B 2 Σ/sub u/ + /minus/X 2 Σ/sub g/ + system. Higher resolution measurements of the metastable 3d 2 configuration in Sc II were also made by laser-rf double resonance. The experimental results will be compared with those obtained by multiconfiguration Hartree-Fock ab-initio calculations. 15 refs., 4 figs., 5 tabs

Mo/Si multilayers with enhanced TiO II- and RuO II-capping layers

Science.gov (United States)

Yulin, Sergiy; Benoit, Nicolas; Feigl, Torsten; Kaiser, Norbert; Fang, Ming; Chandhok, Manish

2008-03-01

The lifetime of Mo/Si multilayer-coated projection optics is one of the outstanding issues on the road of commercialization of extreme-ultraviolet lithography (EUVL). The application of Mo/Si multilayer optics in EUVL requires both sufficient radiation stability and also the highest possible normal-incidence reflectivity. A serious problem of conventional high-reflective Mo/Si multilayers capped by silicon is the considerable degradation of reflective properties due to carbonization and oxidation of the silicon surface layer under exposure by EUV radiation. In this study, we focus on titanium dioxide (TiO II) and ruthenium dioxide (RuO II) as promising capping layer materials for EUVL multilayer coatings. The multilayer designs as well as the deposition parameters of the Mo/Si systems with different capping layers were optimized in terms of maximum peak reflectivity at the wavelength of 13.5 nm and longterm stability under high-intensive irradiation. Optimized TiO II-capped Mo/Si multilayer mirrors with an initial reflectivity of 67.0% presented a reflectivity drop of 0.6% after an irradiation dose of 760 J/mm2. The reflectivity drop was explained by the partial oxidation of the silicon sub-layer. No reflectivity loss after similar irradiation dose was found for RuO II-capped Mo/Si multilayer mirrors having initial peak reflectivity of 66%. In this paper we present data on improved reflectivity of interface-engineered TiO II- and RuO II-capped Mo/Si multilayer mirrors due to the minimization of both interdiffusion processes inside the multilayer stack and absorption loss in the oxide layer. Reflectivities of 68.5% at the wavelength of 13.4 nm were achieved for both TiO II- and RuO II-capped Mo/Si multilayer mirrors.

Data handling at EBR-II [Experimental Breeder Reactor II] for advanced diagnostics and control work

International Nuclear Information System (INIS)

Lindsay, R.W.; Schorzman, L.W.

1988-01-01

Improved control and diagnostics systems are being developed for nuclear and other applications. The Experimental Breeder Reactor II (EBR-II) Division of Argonne National Laboratory has embarked on a project to upgrade the EBR-II control and data handling systems. The nature of the work at EBR-II requires that reactor plant data be readily available for experimenters, and that the plant control systems be flexible to accommodate testing and development needs. In addition, operational concerns require that improved operator interfaces and computerized diagnostics be included in the reactor plant control system. The EBR-II systems have been upgraded to incorporate new data handling computers, new digital plant process controllers, and new displays and diagnostics are being developed and tested for permanent use. In addition, improved engineering surveillance will be possible with the new systems

pH-dependence of the specific binding of Cu(II) and Zn(II) ions to the amyloid-β peptide

International Nuclear Information System (INIS)

Ghalebani, Leila; Wahlström, Anna; Danielsson, Jens; Wärmländer, Sebastian K.T.S.; Gräslund, Astrid

2012-01-01

Highlights: ► Cu(II) and Zn(II) display pH-dependent binding to the Aβ(1–40) peptide. ► At pH 7.4 both metal ions display residue-specific binding to the Aβ peptide. ► At pH 5.5 the binding specificity is lost for Zn(II). ► Differential Cu(II) and Zn(II) binding may help explain metal-induced AD toxicity. -- Abstract: Metal ions like Cu(II) and Zn(II) are accumulated in Alzheimer’s disease amyloid plaques. The amyloid-β (Aβ) peptide involved in the disease interacts with these metal ions at neutral pH via ligands provided by the N-terminal histidines and the N-terminus. The present study uses high-resolution NMR spectroscopy to monitor the residue-specific interactions of Cu(II) and Zn(II) with 15 N- and 13 C, 15 N-labeled Aβ(1–40) peptides at varying pH levels. At pH 7.4 both ions bind to the specific ligands, competing with one another. At pH 5.5 Cu(II) retains its specific histidine ligands, while Zn(II) seems to lack residue-specific interactions. The low pH mimics acidosis which is linked to inflammatory processes in vivo. The results suggest that the cell toxic effects of redox active Cu(II) binding to Aβ may be reversed by the protective activity of non-redox active Zn(II) binding to the same major binding site under non-acidic conditions. Under acidic conditions, the protective effect of Zn(II) may be decreased or changed, since Zn(II) is less able to compete with Cu(II) for the specific binding site on the Aβ peptide under these conditions.

Cirugía de tipo uno y medioventricular en la doble salida del ventrículo izquierdo One a half ventricular surgery type in the double outlet of left ventricle

Directory of Open Access Journals (Sweden)

Luis Marcano Sanz

2012-03-01

Full Text Available La doble salida del ventrículo izquierdo es muy poco frecuente, en la cual la aorta y la arteria pulmonar, emergen completa o predominantemente del ventrículo izquierdo. Cuando se acompañan de comunicación interventricular y de estenosis pulmonar la corrección se realiza usualmente con interposición de un conducto entre el ventrículo derecho y la arteria pulmonar. El objetivo del presente trabajo es presentar un caso tratado con cirugía de tipo uno y medio ventricular, pues, hasta donde conocemos, esta técnica no ha sido empleada en esta enfermedad para evitar el uso de conductos protésicos. Se reporta en una niña de 3 años de edad, a quien se le cerró la comunicación interventricular, se desconectó la arteria pulmonar del ventrículo izquierdo y se anastomosó al nuevo tracto de salida del ventrículo derecho, y se realizó derivación cavopulmonar parcial. Después de 6 años de seguimiento presenta buena evolución clínica, ecocardiográfica y capacidad funcional adecuada.The double outlet of the left ventricle is uncommon, where the aorta and the pulmonary artery emerge total or predominantly from the left ventricle. When they are accompanied of an interventricular communication and of pulmonary stenosis, the correction is usually carried out with the insertion of a conduct between the right ventricle and the pulmonary artery. The objective of present paper is to present a case treated with one half ventricular surgery type and ventricular medium, since until is known, this technique has not used in this disease to avoid the use of prosthetic conducts. Authors reports the case of a girl aged 3 undergoes the closure of the interventricular communication, switching off the pulmonary artery of the left ventricle and anastomosing it to the new outlet tract of right ventricle, carrying out a partial cavopulmonary bypass. After 6 years of follow-up she has a good clinical and echocardiographic evolution as well as a appropriate

TRUPACT-II procedures and maintenance instructions

International Nuclear Information System (INIS)

1994-01-01

The purpose of this document is to provide the technical requirements for operation, inspection and maintenance of a TRUPACT-II Shipping Package and directly related components. This document shall supply the minimum requirements as specified in the TRUPACT-II Safety Analysis Report for Packaging (SARP) and Certificate of Compliance (C of C) 9218. In the event there is a conflict between this document and the TRUPACT-II SARP (NRC Certificate of Compliance No. 9218), the TRUPACT-II SARP shall govern. This document details the operations, maintenance, repair, replacement of components, as well as the documentation required and the procedures to be followed to maintain the integrity of the TRUPACT-II container. These procedures may be modified for site use, but as a minimum all parameters and format listed herein must be included in any site modified version. For convenience and where applicable steps may be performed out of sequence. Packaging and payload handling equipment and transport trailers have been specifically designed for use with the TRUPACT-II Packaging. This document discusses the minimum required procedures for use of the adjustable center of gravity lift fixture and the TRUPACT-II transport trailer in conjunction with the TRUPACT-II Packaging

Angiotensin II (AngII) induces the expression of suppressor of cytokine signaling (SOCS)-3 in rat hypothalamus - a mechanism for desensitization of AngII signaling.

Science.gov (United States)

Torsoni, Márcio A; Carvalheira, José B; Calegari, Vivian C; Bezerra, Rosangela M N; Saad, Mário J A; Gontijo, José A; Velloso, Lício A

2004-04-01

Angiotensin II exerts a potent dypsogenic stimulus on the hypothalamus, which contributes to its centrally mediated participation in the control of water balance and blood pressure. Repetitive intracerebroventricular (i.c.v.) injections of angiotensin II lead to a loss of effect characterized as physiological desensitization to the peptide's action. In the present study, we demonstrate that angiotensin II induces the expression of suppressor of cytokine signaling (SOCS)-3 via angiotensin receptor 1 (AT1) and JAK-2, mostly located at the median preoptic lateral and anterodorsal preoptic nuclei. SOCS-3 produces an inhibitory effect upon the signal transduction pathways of several cytokines and hormones that employ members of the JAK/STAT families as intermediaries. The partial inhibition of SOCS-3 translation by antisense oligonucleotide was sufficient to significantly reduce the refractoriness of repetitive i.c.v. angiotensin II injections, as evaluated by water ingestion. Thus, by acting through AT1 on the hypothalamus, angiotensin II induces the expression of SOCS-3 which, in turn, blocks further activation of the pathway and consequently leads to desensitization to angiotensin II stimuli concerning its dypsogenic effect.

ECLESIOLOGIA DO VATICANO II

Directory of Open Access Journals (Sweden)

Víctor Codina

2013-01-01

Full Text Available Não se pode compreender a eclesiologia do Vaticano II sem conhecer a vida, o estilo pastoral e o carisma de João XXIII, que convocou o Concílio e abriu o caminho em direção a uma nova configuração eclesial que acabava com séculos de uma Igreja de Cristandade. O Vaticano II implica uma transição de uma Igreja clerical a uma Igreja Povo de Deus, povo de batizados. A passagem de uma Igreja juridicista e legalista a uma Igreja Mistério de comunhão em Cristo. Mudar de uma Igreja triunfalista e ligada ao poder mundano a uma Igreja vivificada pela força renovadora do Espírito. A Igreja está a caminho rumo ao Reino de Deus juntamente com todos os cristãos e com toda a humanidade. A recepção do Vaticano II supõe uma conversão pastoral: voltar ao Evangelho e abrir-se aos novos sinais dos tempos seguindo o Espírito que inspirou João XXIII. ABSTRACT: You cannot understand the Ecclesiology of Vatican II without knowing the life, the pastoral style and the charisma of John XXIII, who convened the Council and opened the way toward a new ecclesial setting that ended centuries of a church of Christendom. The Vatican II involves a transition from a clerical Church to a “People (baptized people of God” Church. The Vatican II implies the passage from a juridical and legalistic Church to a Church as the Mystery of the communion in Christ. The Vatican II implies the change from a triumphalistic Church and connected to worldly power to a Church vivified by the renewing force of the Spirit. The Church is on its way toward the Kingdom of God together with all Christians and all mankind. The reception of the Vatican II supposes a pastoral conversion: a return to the Gospel and openness to new signs of the times following the Spirit that inspired John XXIII.

FeII/MgII Emission Line Ratio in High Redshift Quasars

DEFF Research Database (Denmark)

Dietrich, M.; Hamann, F.; Appenzeller, I.

2003-01-01

the evolution of the FeII/MgII ratio over a wider range in cosmic time, we measured this ratio for composite quasar spectra which cover a redshift range of 0 4 quasars must have started already at an epoch corresponding to z_f = 6 to 9, when the age of the universe was ~0.5 Gyr (H_o = 72 km/s/Mpc, Omega_M = 0...

Glutamate Ligation in the Ni(II)- and Co(II)-Responsive Escherichia coli Transcriptional Regulator, RcnR

Energy Technology Data Exchange (ETDEWEB)

Carr, Carolyn E. [Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States; Musiani, Francesco [Laboratory; Huang, Hsin-Ting [Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States; Chivers, Peter T. [Departments of Biosciences and Chemistry, Durham University, Durham DH1 3LE, United Kingdom; Ciurli, Stefano [Laboratory; Maroney, Michael J. [Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States

2017-05-18

Escherichia coli RcnR (resistance to cobalt and nickel regulator, EcRcnR) is a metal-responsive repressor of the genes encoding the Ni(II) and Co(II) exporter proteins RcnAB by binding to PRcnAB. The DNA binding affinity is weakened when the cognate ions Ni(II) and Co(II) bind to EcRcnR in a six-coordinate site that features a (N/O)5S ligand donor-atom set in distinct sites: while both metal ions are bound by the N terminus, Cys35, and His64, Co(II) is additionally bound by His3. On the other hand, the noncognate Zn(II) and Cu(I) ions feature a lower coordination number, have a solvent-accessible binding site, and coordinate protein ligands that do not include the N-terminal amine. A molecular model of apo-EcRcnR suggested potential roles for Glu34 and Glu63 in binding Ni(II) and Co(II) to EcRcnR. The roles of Glu34 and Glu63 in metal binding, metal selectivity, and function were therefore investigated using a structure/function approach. X-ray absorption spectroscopy was used to assess the structural changes in the Ni(II), Co(II), and Zn(II) binding sites of Glu → Ala and Glu → Cys variants at both positions. The effect of these structural alterations on the regulation of PrcnA by EcRcnR in response to metal binding was explored using LacZ reporter assays. These combined studies indicate that while Glu63 is a ligand for both metal ions, Glu34 is a ligand for Co(II) but possibly not for Ni(II). The Glu34 variants affect the structure of the cognate metal sites, but they have no effect on the transcriptional response. In contrast, the Glu63 variants affect both the structure and transcriptional response, although they do not completely abolish the function of EcRcnR. The structure of the Zn(II) site is not significantly perturbed by any of the glutamic acid variations. The spectroscopic and functional data obtained on the mutants were used to calculate models of the metal-site structures of EcRcnR bound to Ni(II), Co(II), and Zn(II). The results are interpreted

Biosorption of Fe (II) and Cd (II) ions from aqueous solution using a ...

African Journals Online (AJOL)

ADOWIE PERE

Biosorption of Fe (II) and Cd (II) ions from aqueous solution using a low cost ... human activities in the environment poses a lot of risk ... ion exchange or reverse osmosis, electrochemical treatment ..... is the adsorption coefficient, n indicates the.

SPEAR II performance

International Nuclear Information System (INIS)

Paterson, J.M.

1975-01-01

The single beam and colliding beam performance of the SLAC electron-positron storage ring SPEAR II is described. The sevenfold increase in harmonic number in SPEAR II in comparison to SPEAR I has made significant changes in single beam behavior. Strong synchrobetatron resonances and a new transverse instability are observed, and our first studies of these phenomena are described. Measurements on current dependent bunch lengthening are presented. (auth)

Silver precipitation from electrolytic effluents; Precipitacion de plata de efluentes electroliticos

Energy Technology Data Exchange (ETDEWEB)

Rivera, I.; Patino, F.; Cruells, M.; Roca, A.; Vinals, J.

2004-07-01

The recovery of silver contained in electrolytic effluents is attractive due to its high economic value. These effluents are considered toxic wastes and it is not possible to dump them directly without any detoxification process. One of the most important way for silver recovery is the precipitation with sodium ditionite, sodium borohidride or hydrazine monohidrate. In this work, the most significant aspects related to the use of these reagents is presented. Results of silver precipitation with sodium ditionite from effluents containing thiosulfate without previous elimination of other species are also presented. silver concentration in the final effluents w <1 ppm. (Author) 15 refs.

Arsenic precipitation from metallurgical effluents; Precipitacion de arsenico desde efluentes metalurgicos

Energy Technology Data Exchange (ETDEWEB)

Navarro, P.; Vargas, C.; Araya, E.; Martin, I.; Alguacil, F. J.

2004-07-01

In the mining-metallurgical companies different liquid effluents are produced, which can contain a series of dissolved elements that are considered dangerous from an environmental point of view. One of these elements is the arsenic, especially in the state of oxidation +5 that can be precipitated as calcium or iron arsenate. To fulfil the environmental requests it should have in solution a content of arsenic lower than 0,5 mg/l and the obtained solid product should be very stable under the condition in which it will be stored. this work looks for the best conditions of arsenic precipitation, until achieving contents in solution lower than such mentioned concentration. Also, the stability of the precipitates was studied. (Author) 7 refs.

Synthesis and Crystal Structures of Luminescent Mononuclear Ni(ii and Cd(ii Complexes with 1,10-phenanthroline

Directory of Open Access Journals (Sweden)

Ecaterina Tocana

2017-12-01

Full Text Available New supramolecular systems of Ni(II and Cd(II with 1,10-phenanthroline constructed by non-covalent interactions have been synthesized and characterized by single-crystal X-ray diffractometry. The smaller nickel(II ion forms a cis complex with outer-sphere perchlorates, while the cadmium(II ion forms a trans complex involving inner-sphere perchlorates. Both compoundsrevealintraligand-basedluminescentproperties.

Interaction of Cr (III), Ni (II), Pb (II) with DTPA complexes of essential metal ions

International Nuclear Information System (INIS)

Gulzar, S.; Zahida; Maqsood, T.; Naqvi, R.R.

2002-01-01

With the increase of anthropogenic activities in the environment, heavy metal toxicity (Chromium, Nickel and Lead) is more common now. DTPA (diethylene triamine pentaacetic acid) a polyamino carboxylic acid is widely used to form hydrophilic and stable complexes with most of the metal ions. In this spectrophotometric study, concentration of Cr(III), Ni(II) and Pb(II) (toxic metal ions) exchanged with Fe(III), Zn(II) and Ca(II) from their DTPA complexes were estimated at pH 4,7 and 9. Concentration of added metal was varied from 1-4 times to that of complexed metal. (author)

Study of physicochemical parameters for cadmium (II) and mercury (II) phytoremediation using the specie Eichhornia Crassipes (water hyacinth)

International Nuclear Information System (INIS)

Poma Llantoy, Victor R.; Valderrama Negron, Ana C.

2014-01-01

In this work, the studies were performed to measure the sorption capacity of metal ions Cd (II) and Hg (II) using the specie Eichhornia crassipes (water hyacinth). This study includes assays where the nutrient concentration, the pH and the metal ion concentration were optimized. These tests were carried out at room temperature and with aqueous solutions of Cd (II), Hg (II), in which the samples of Eichhornia crassipes were placed. To confirm the removal of these metals, the waste solutions after the treatment with the Water Hyacinth species were treated using the method APHA 3030-e. However, Eichhornia crassipes samples were treated using the EPA 200.3 method. The concentration of Cd (II) was determined by an ICP-OES spectrometer and Hg (II), by an atomic absorption spectrophotometer. The results showed: Optimal dosage 1 mL of A and 0,5 mL of B, optimum pH 5, optimum concentration of Cd (II) and Hg (II) 5 mg/L for each ion. With these parameters, it was started the removal of 5 mg/L of the metal ions contained in 1 L of solution. Being the percentages of sorption 16,56% for Cd (II) and 15,6% for Hg (II) after a period of 7 days. (author)

Integrated Procurement Management System, Version II

Science.gov (United States)

Collier, L. J.

1985-01-01

Integrated Procurement Management System, Version II (IPMS II) is online/ batch system for collecting developing, managing and disseminating procurementrelated data at NASA Johnson Space Center. Portions of IPMS II adaptable to other procurement situations.

Contact angle study on the activation mechanisms of sphalerite with Cu(II) and Pb(II); Estudio de los mecanismos de activacion de la esfalerita con Cu(II) y Pb(II)

Energy Technology Data Exchange (ETDEWEB)

Davila Pulido, G. I.; Uribe Salas, A.

2011-07-01

This article presents results of an experimental study on the sphalerite activation with Cu(II) and Pb(II), whose main objective was to investigate the activation mechanisms and to evaluate the magnitude of the hydrophobization achieved with both chemical species. The hydrophobicity acquired by the mineral due to the interaction with the activator and collector (sodium isopropyl xanthate) is characterized making use of the contact angle technique. The results show that Cu(II) replaces the Zn of the external layers of the mineral, promoting the sulfide (S{sup 2}-) oxidation to produce a mixture of CuS, Cu{sub 2}S and S{sup o}, of hydrophobic nature. The subsequent interaction with xanthate increases the hydrophobicity of the mineral surface. In turn, Pb(II) activation of sphalerite is due to the formation of a PbS layer that reacts with xanthate to produce hydrophobic species (e.g., PbX{sub 2}). It is also observed that the hydrophobicity of sphalerite activated with Pb(II) is favored under air atmospheres, as compared to that obtained under nitrogen atmospheres. It is concluded that the hydrophobicity achieved by lead activation may be of the same order of magnitude to that deliverately induced by copper activation. (Author) 11 refs.

Preliminary PBFA II design

International Nuclear Information System (INIS)

Johnson, D.L.; VanDevender, J.P.; Martin, T.H.

1980-01-01

The upgrade of Sandia National Laboratories particle beam fusion accelerator, PBFA I, to PBFA II presents several interesting and challenging pulsed power design problems. PBFA II requires increasing the PBFA I output parameters from 2 MV, 30 TW, 1 MJ to 4 MV, 100 TW, 3.5 MJ with the constraint of using much of the same PBFA I hardware. The increased PBFA II output will be obtained by doubling the number of modules (from 36 to 72), increasing the primary energy storage (from 4 MJ to 15 MJ), lowering the pulse forming line (PFL) output impedance, and adding a voltage doubling network

Photoreactions of ruthenium(II) and osmium(II) complexes with deoxyribonucleic acid (DNA).

Science.gov (United States)

Moucheron, C; Kirsch-De Mesmaeker, A; Kelly, J M

1997-09-01

The design of Ru(II) and Os(II) complexes which are photoreactive with deoxyribonucleic acid (DNA) represents one of the main targets for the development of novel molecular tools for the study of DNA and, in the future, for the production of new, metal-based, anti-tumor drugs. In this review, we explain how it is possible to make a complex photoreactive with nucleobases and nucleic acids. According to the photophysical behaviour of the Ru(II) compounds, two types of photochemistry are expected: (1) photosubstitution of a ligand by a nucleobase and another monodentate ligand, which takes place from the triplet, metal-centred (3MC) state; this state is populated thermally from the lowest lying triplet metal to ligand charge transfer (3MLCT) state; (2) photoreaction from the 3MLCT state, corresponding to photoredox processes with DNA bases. The two photoreactivities are in competition. By modulating appropriately the redox properties of the 3MLCT state, an electron transfer process from the base to the excited complex takes place, and is directly correlated with DNA cleavage or the formation of an adduct of the complex to DNA. In this adduct, guanine is linked by N2 to the alpha-position of a non-chelating nitrogen of the polyazaaromatic ligand without destruction of the complex. Different strategies are explained which increase the affinity of the complexes for DNA and direct the complex photoreactivity to sites of special DNA topology or targeted sequences of bases. Moreover, the replacement of the Ru(II) ion by the Os(II) ion in the photoreactive complexes leads to an increased specificity of photoreaction. Indeed, only one type of photoreactivity (from the 3MLCT state) is present for the Os(II) complexes because the 3MC state is too high in energy to be populated at room temperature.

Radiative parameters for some transitions in Cu(II) and Ag(II) spectrum

International Nuclear Information System (INIS)

Biemont, E.; Blagoev, K.; Campos, J.; Mayo, R.; Malcheva, G.; Ortiz, M.; Quinet, P.

2005-01-01

Radiative parameters for transitions depopulating the levels belonging to the 3d 8 4s 2 configuration of Cu(II) and 4d 9 6s and 4d 9 5d configurations of Ag(II) have been obtained both theoretically and experimentally. On the experimental side, a laser-produced plasma was used as a source of Cu(II) and Ag(II) spectra. The light emitted by the plasma was focused on the input slit of a grating monochromator coupled with a time-resolved optical multichannel analyzer system. Spectral response calibration of the experimental system was made using a deuterium lamp in the wavelength range extending from 200 to 400-bar nm, and a standard tungsten lamp in the range from 350 to 600-bar nm. The transition probabilities were obtained using measured branching fractions and available radiative lifetimes of the corresponding states. On the theoretical side, a relativistic Hartree-Fock (HFR) approach, including core-polarization effects, has been used for the calculations. A reasonable agreement theory-experiment has been observed

Modeling Fe II Emission and Revised Fe II (UV) Empirical Templates for the Seyfert 1 Galaxy I Zw 1

Science.gov (United States)

Bruhweiler, F.; Verner, E.

2008-03-01

We use the narrow-lined broad-line region (BLR) of the Seyfert 1 galaxy, I Zw 1, as a laboratory for modeling the ultraviolet (UV) Fe II 2100-3050 Å emission complex. We calculate a grid of Fe II emission spectra representative of BLR clouds and compare them with the observed I Zw 1 spectrum. Our predicted spectrum for log [nH/(cm -3) ] = 11.0, log [ΦH/(cm -2 s-1) ] = 20.5, and ξ/(1 km s-1) = 20, using Cloudy and an 830 level model atom for Fe II with energies up to 14.06 eV, gives a better fit to the UV Fe II emission than models with fewer levels. Our analysis indicates (1) the observed UV Fe II emission must be corrected for an underlying Fe II pseudocontinuum; (2) Fe II emission peaks can be misidentified as that of other ions in active galactic nuclei (AGNs) with narrow-lined BLRs possibly affecting deduced physical parameters; (3) the shape of 4200-4700 Å Fe II emission in I Zw 1 and other AGNs is a relative indicator of narrow-line region (NLR) and BLR Fe II emission; (4) predicted ratios of Lyα, C III], and Fe II emission relative to Mg II λ2800 agree with extinction corrected observed I Zw 1 fluxes, except for C IV λ1549 (5) the sensitivity of Fe II emission strength to microturbulence ξ casts doubt on existing relative Fe/Mg abundances derived from Fe II (UV)/Mg II flux ratios. Our calculated Fe II emission spectra, suitable for BLRs in AGNs, are available at http://iacs.cua.edu/people/verner/FeII. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 05-26555.

Adsorption and thermodynamic studies of Cu(II) and Zn(II) on organofunctionalized-kaolinite

International Nuclear Information System (INIS)

Guerra, Denis Lima; Airoldi, Claudio; Sousa, Kaline S. de

2008-01-01

Kaolinite-bearing clay samples from Perus, Sao Paulo state, Brazil, were used for chemical modification process with dimethyl sulfoxide and organofunctionalized with the silyating agent (RO) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH 2 in the present study. The resulting material and natural kaolinite were subjected adsorpion process with Cu(II) and Zn(II) from aqueous solution at pH 6.0 and controlated temperature of 298 K. The Langmuir adsorption isotherm model has been applied to fit the experimental data. The results showed that the chemical modification process increases the basal spacing of the natural kaolinite from 0.711 to 0.955 nm. The energetic effects caused by Cu(II) and Zn(II) interactions were determined through calorimetric titration at the solid-liquid interface and gave a net thermal effect that enabled the calculation of the exothermic values and the equilibrium constant

Synthesis, spectroscopic and DNA binding ability of Co{sup II}, Ni{sup II}, Cu{sup II} and Zn{sup II} complexes of Schiff base ligand (E)-1-(((1H-benzo[d]imidazol-2-yl)methylimino)methyl)naphthalen-2-ol. X-ray crystal structure determination of cobalt (II) complex

Energy Technology Data Exchange (ETDEWEB)

Yarkandi, Naeema H. [Chemistry Department, Faculty of Applied Science, Umm Al–Qura University, Makkah (Saudi Arabia); El-Ghamry, Hoda A., E-mail: helghamrymo@yahoo.com [Chemistry Department, Faculty of Applied Science, Umm Al–Qura University, Makkah (Saudi Arabia); Chemistry Department, Faculty of Science, Tanta University, Tanta (Egypt); Gaber, Mohamed [Chemistry Department, Faculty of Science, Tanta University, Tanta (Egypt)

2017-06-01

A novel Schiff base ligand, (E)-1-(((1H-benzo[d]imidazol-2-yl)methylimino)methyl)naphthalen-2-ol (HL), has been designed and synthesized in addition to its metal chelates [Co(L){sub 2}]·l2H{sub 2}O, [Ni(L)Cl·(H{sub 2}O){sub 2}].5H{sub 2}O, [Cu(L)Cl] and [Zn(L)(CH{sub 3}COO)]. The structures of the isolated compounds have been confirmed and identified by means of different spectral and physicochemical techniques including CHN analysis, {sup 1}H &{sup 13}C NMR, mass spectral analysis, molar conductivity measurement, UV–Vis, infrared, magnetic moment in addition to TGA technique. The infrared spectral results ascertained that the ligand acts as monobasic tridentate binding to the metal centers via deprotonated hydroxyl oxygen, azomethine and imidazole nitrogen atoms. The UV–Vis, magnetic susceptibility and molar conductivity data implied octahedral geometry for Co(II) & Ni(II) complexes, tetrahedral for Zn(II) complex and square planar for Cu(II) complex. X-ray structural analysis of Co(II) complex 1 has been reported and discussed. Moreover, the type of interaction between the ligand & its complexes towards salmon sperm DNA (SS-DNA) has been examined by the measurement of absorption spectra and viscosity which confirmed that the ligand and its complexes interact with DNA via intercalation interaction as concluded from the values of binding constants (K{sub b}). - Highlights: • Synthesis of Co{sup II}, Ni{sup II}, Cu{sup II} and Zn{sup II} complexes of the Schiff base ligand based on 2-(aminomethyl)benzimidazole moiety. • The constitutions and structures of the ligand and complexes were elucidated. • Molecular structure of Co{sup II} complex was confirmed by single crystal X-ray diffraction method. • The ligand and its complexes interact with SS-DNA via intercalation mods.

World War II Homefront.

Science.gov (United States)

Garcia, Rachel

2002-01-01

Presents an annotated bibliography that provides Web sites focusing on the U.S. homefront during World War II. Covers various topics such as the homefront, Japanese Americans, women during World War II, posters, and African Americans. Includes lesson plan sources and a list of additional resources. (CMK)

Synthesis of poly(aminopropyl/methyl)silsesquioxane particles as effective Cu(II) and Pb(II) adsorbents.

Science.gov (United States)

Lu, Xin; Yin, Qiangfeng; Xin, Zhong; Li, Yang; Han, Ting

2011-11-30

Poly(aminopropyl/methyl)silsesquioxane (PAMSQ) particles have been synthesized by a one-step hydrolytic co-condensation process using 3-aminopropyltriethoxysilane (APTES) and methyltrimethoxysilane (MTMS) as precursors in the presence of base catalyst in aqueous medium. The amino functionalities of the particles could be controlled by adjusting the organosilanes feed ratio. The compositions of the amino-functionalized polysilsesquioxanes were confirmed by FT-IR spectroscopy, solid-state (29)Si NMR spectroscopy, and elemental analysis. The strong adsorbability of Cu(II) and Pb(II) ions onto PAMSQ particles was systematically examined. The effect of adsorption time, initial metal ions concentration and pH of solutions was studied to optimize the metal ions adsorbability of PAMSQ particles. The kinetic studies indicated that the adsorption process well fits the pseudo-second-order kinetics. Adsorption phenomena appeared to follow Langmuir isotherm. The PAMSQ particles demonstrate the highest Cu(II) and Pb(II) adsorption capacity of 2.29 mmol/g and 1.31 mmol/g at an initial metal ions concentration of 20mM, respectively. The PAMSQ particles demonstrate a promising application in the removal of Cu(II) and Pb(II) ions from aqueous solutions. Copyright © 2011 Elsevier B.V. All rights reserved.

Homology modeling and docking of AahII-Nanobody complexes reveal the epitope binding site on AahII scorpion toxin.

Science.gov (United States)

Ksouri, Ayoub; Ghedira, Kais; Ben Abderrazek, Rahma; Shankar, B A Gowri; Benkahla, Alia; Bishop, Ozlem Tastan; Bouhaouala-Zahar, Balkiss

2018-02-19

Scorpion envenoming and its treatment is a public health problem in many parts of the world due to highly toxic venom polypeptides diffusing rapidly within the body of severely envenomed victims. Recently, 38 AahII-specific Nanobody sequences (Nbs) were retrieved from which the performance of NbAahII10 nanobody candidate, to neutralize the most poisonous venom compound namely AahII acting on sodium channels, was established. Herein, structural computational approach is conducted to elucidate the Nb-AahII interactions that support the biological characteristics, using Nb multiple sequence alignment (MSA) followed by modeling and molecular docking investigations (RosettaAntibody, ZDOCK software tools). Sequence and structural analysis showed two dissimilar residues of NbAahII10 CDR1 (Tyr27 and Tyr29) and an inserted polar residue Ser30 that appear to play an important role. Indeed, CDR3 region of NbAahII10 is characterized by a specific Met104 and two negatively charged residues Asp115 and Asp117. Complex dockings reveal that NbAahII17 and NbAahII38 share one common binding site on the surface of the AahII toxin divergent from the NbAahII10 one's. At least, a couple of NbAahII10 - AahII residue interactions (Gln38 - Asn44 and Arg62, His64, respectively) are mainly involved in the toxic AahII binding site. Altogether, this study gives valuable insights in the design and development of next generation of antivenom. Copyright © 2018 Elsevier Inc. All rights reserved.

TRUPACT-II container maintenance program plan

International Nuclear Information System (INIS)

1990-11-01

This document details the maintenance/repair and replacement of components, as well as the documentation required and the procedures to be followed to maintain the integrity of the TRUPACT-II container, in accordance with requirements of the TRUPACT-II Container Operations and Maintenance Manual, OM-134, the TRUPACT-II Container Safety Analysis Report (SARP), and the TRUPACT-II Container Certificate of Compliance (Number 9218). The routine shipping and receiving inspections required by the Department of Transportation (DOT), Department of Energy (DOE), Nuclear Regulatory Commission (NRC) and other regulations are not addressed in this document. This document applies to all DOE shipping and receiving sites that use the TRUPACT-II containers

Habitar las incomodidades en investigaciones feministas y activistas desde una práctica reflexiva

Directory of Open Access Journals (Sweden)

Itziar Gandarias Goikoetxea

2014-12-01

Full Text Available A partir de una investigación en curso cuyo objetivo es estudiar las dificultades y posibilidades para la articulación de alianzas políticas entre organizaciones de mujeres migradas y feministas autóctonas en el País Vasco, presento mediante una práctica reflexiva algunas de las incomodidades más relevantes surgidas durante este proceso relacionadas con: (i moverse en la incertidumbre, (ii asumir las diferencias, (iii hablar sobre las participantes de la investigación y en último lugar, (iv habitar mi doble rol como investigadora y activista. Más que resolverlas, esta práctica de reflexividad es una apuesta por politizar las metodologías feministas y reivindicar la ética de la incomodidad como una herramienta indispensable para habitar los espacios fronterizos entre investigación y activismo.

MHC class II expression in lung cancer.

Science.gov (United States)

He, Yayi; Rozeboom, Leslie; Rivard, Christopher J; Ellison, Kim; Dziadziuszko, Rafal; Yu, Hui; Zhou, Caicun; Hirsch, Fred R

2017-10-01

Immunotherapy is an exciting development in lung cancer research. In this study we described major histocompatibility complex (MHC) Class II protein expression in lung cancer cell lines and patient tissues. We studied MHC Class II (DP, DQ, DR) (CR3/43, Abcam) protein expression in 55 non-small cell lung cancer (NSCLC) cell lines, 42 small cell lung cancer (SCLC) cell lines and 278 lung cancer patient tissues by immunohistochemistry (IHC). Seven (12.7%) NSCLC cell lines were positive for MHC Class II. No SCLC cell lines were found to be MHC Class II positive. We assessed 139 lung cancer samples available in the Hirsch Lab for MHC Class II. There was no positive MHC Class II staining on SCLC tumor cells. MHC Class II expression on TILs in SCLC was significantly lower than that on TILs in NSCLC (P＜0.001). MHC Class II was also assessed in an additional 139 NSCLC tumor tissues from Medical University of Gdansk, Poland. Patients with positive staining of MHC Class II on TILs had longer regression-free survival (RFS) and overall survival (OS) than those whose TILs were MHC Class II negative (2.980 years, 95% CI 1.628-4.332 vs. 1.050 years, 95% CI 0.556-1.554, P=0.028) (3.230 years, 95% CI 2.617-3.843 vs. 1.390 years, 95% CI 0.629-2.151, P=0.014). MHC Class II was expressed both in NSCLC cell lines and tissues. However, MHC Class II was not detected in SCLC cell lines or tissue tumor cells. MHC Class II expression was lower on SCLC TILs than on NSCLC TILs. Loss of expression of MHC Class II on SCLC tumor cells and reduced expression on SCLC TILs may be a means of escaping anti-cancer immunity. Higher MHC Class II expression on TILs was correlated with better prognosis in patients with NSCLC. Copyright © 2017. Published by Elsevier B.V.

Potassium iron(III)hexacyanoferrate(II) supported on polymethylmethacrylate ion-exchanger for removal of strontium(II)

International Nuclear Information System (INIS)

Taj, S.; Ashraf Chaudhry, M.; Mazhar, M.

2009-01-01

Potassium iron(III)hexacyanoferrate(II) supported on poly metylmethacrylate has been synthesized and investigated for the strontium(II) removal from HNO 3 and HCl solutions. The ion exchange material characterized by different techniques and found to be stable in 1.0-4.0 M HNO 3 solutions, has been used to elaborate different parameters related to ion exchange and sorption processes involved. The data collected suggested its use to undertake removal of Sr(II) from more acidic active waste solutions. Thus the material synthesized had been adjudged to present better chances of application for Sr(II) removal as compared to other such materials. (author)

Receptor binding radiotracers for the angiotensin II receptor: radioiodinated [Sar1, Ile8]angiotensin II