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1

Línea de base del Proyecto de producción ecológica, comercialización y asociatividad de las mujeres en el medio rural: Características de las socias  

Microsoft Academic Search

El siguiente informe presenta los resultados de la evaluación línea de base de un proyecto de Grameen Loja de Ecuador, financiado por el Banco Interamericano de Desarrollo (Convenio de Financiamiento SP\\/SF-07-02-EC. y Cooperación Técnica no Reembolsable ATN\\/SF-1042-EC), cuyo objetivo es mejorar los ingresos y la salud de las mujeres microempresarias emprendedoras y sus familias en el sur del Ecuador, facilitando

Carlos Palán Tamayo

2009-01-01

2

ARTICULACIÓN DE LAS ORGANIZACIONES DE SEXOSERVIDORAS CON LAS POLÍTICAS DE SALUD EN MÉXICO: BARRIO DE LA MERCED 2003  

Microsoft Academic Search

1. Antecedentes El presente trabajo de investigación surge como respuesta a la inquietud de generar una perspectiva diferente que, además de explicar el fenómeno del sexoservicio y sus implicaciones en la salud, pueda determinar líneas de acción encauzadas al mejoramiento de las condiciones de vida y oportunidades objetivas en la obtención de servicios integrales de salud para las mujeres que

Manuel Enrique; Morales Santiago

3

La Mujer Chicana: An Annotated Bibliography, 1976.  

ERIC Educational Resources Information Center

|Intended to provide interested persons, researchers, and educators with information about "la mujer Chicana", this annotated bibliography cites 320 materials published between 1916 and 1975, with the majority being between 1960 and 1975. The 12 sections cover the following subject areas: Chicana publications; Chicana feminism and "el movimiento";…

Chapa, Evey, Ed.; And Others

4

Comparación de la percepción del riesgo de infección con el VIH y las prácticas sexuales en un grupo de trabajadoras sexuales y aspirantes  

Microsoft Academic Search

Background: Prostitution is regarded as a risk factor for sexually transmitted diseases including HIV\\/AIDS. Objective: To evaluate the perception of HIV\\/AIDS risk and risky sexual practices of commercial sex workers registered in a municipal clinic where they are licensed to work in comparison with recent women entrants. Material and methods: A survey was done in experienced sexual workers: street prostitutes,

José Manuel Ramírez Aranda; Esperanza Álvarez Garza

5

El chisme y las representaciones sociales de género y sexualidad  

Microsoft Academic Search

Este documento es resultado de una investigación realizada con estudiantes adolescentes que cursan el nivel medio superior en la Universidad Autónoma Chapingo (UACH), la cual imparte ingenierías en ciencias agronómicas y afines. El número de estudiantes varones es prácticamente tres veces superior al de las mujeres y ambos conviven en sus actividades escolares de tiempo completo. El objeto del trabajo

MARÍA EUGENIA; CHÁVEZ ARELLANO; VERÓNICA VÁZQUEZ GARCÍA; AURELIA DE LA ROSA REGALADO

6

Comunicaci?n de pareja y VIH en mujeres en desventaja social  

PubMed Central

Introducción La epidemia de VIH y SIDA se ha diseminado rápidamente a nivel mundial tendiendo a la feminización, pauperización y heterosexualización. La comunicación de pareja en torno el VIH es descrita como uno de los factores protectores en la adquisición de esta enfermedad, favoreciendo la adopción de conductas sexuales seguras tales como la negociación de pareja y la utilización de preservativo, consideróndose como un pilar fundamental en la incorporación de medidas de autocuidado en la sexualidad femenina. Objetivo Determinar el nivel de comunicación de pareja en torno al VIH en mujeres chilenas en desventaja social. Metodología Cuatrocientas noventa y seis mujeres contestaron la entrevista inicial de la investigación “Testing an HIV/AIDS Prevention Intervention for Chilean Women” (RO1 TW 006977 PI Cianelli). Se utilizó la escala “Health protective sexual communication scale (HPC)” (0–10 puntos). Se realizó un análisis descriptivo utilizando el programa SPSS 16.0. Resultados El promedio del nivel de comunicación de pareja fue de 3,26 ± 2,7 puntos con la pareja principal, de 2,52 ± 2,48 puntos con una segunda pareja y de 0 puntos con una tercera pareja. Los temas de menor comunicación entre las parejas fueron el uso de preservativo y la realización del test para VIH antes de tener relaciones sexuales. Conclusión Las mujeres de la muestra presentan bajos niveles de comunicación de pareja en relación a VIH con todas sus parejas sexuales. Son necesarias estrategias que potencien este tópico dentro de las intervenciones de prevención de VIH y SIDA de manera de fortalecer la adopción de conductas de autocuidado en torno al tema.

Rosina Cianelli, A.; Lilian Ferrer, L.; Margarita Bernales, S.; Natalia Villegas, R.

2009-01-01

7

Las Mujeres Saludables : Reaching Latinas for Breast, Cervical and Colorectal Cancer Prevention and Screening  

Microsoft Academic Search

Community health advisors have effectively promoted breast and cervical cancer prevention and screening among low-income Latina\\u000a women. Specific elements of such programs, such as enhanced social support, may explain successes. Promotion of colorectal\\u000a cancer screening has been less studied. Promotoras de Salud (i.e., Latina health advisors) implemented a 12-week program among women recruited from community-based organizations. The\\u000a program educated 366

Linda Larkey

2006-01-01

8

STAR inscribe 6.139 Mujeres en el primer año  

Cancer.gov

El Estudio del Tamoxifeno y Raloxifeno (STAR) inscribió en el primer año 6.139 mujeres posmenopáusicas con un alto riesgo de desarrollar cáncer de seno en este trascendental estudio para la prevención, que comenzó el primero de julio de 1999.

9

El consumo de tabaco y la exposición al humo de tabaco en el ambiente durante el embarazo pueden poner en peligro la salud de mujeres y niños en países en desarrollo  

Cancer.gov

Las conclusiones de un estudio del NIH indican que las tasas de consumo de tabaco durante el embarazo, así como la exposición de mujeres embarazadas y de sus niños al humo de tabaco en el ambiente constituyen amenazas significativas para la salud en varios países de ingresos medios y bajos. En unos pocos de los países en donde se tomaron las muestras, incluso algunos de América Latina, los índices de exposición al humo de tabaco probablemente ya son lo suficientemente altos como para justificar una preocupación considerable.

10

Diferencias en las características sociales, conductas de riesgo y prevalencia de infección por el virus de la inmunodeficiencia humana e infecciones de transmisión sexual entre trabajadoras del sexo españolas e inmigrantes en Cataluña  

Microsoft Academic Search

Background and objectiveTo describe and compare the social characteristics, human immunodeficiency virus (HIV), Chlamydia trachomatis and Neisseria gonorrhoae prevalences, and risk behaviours among immigrant female sex workers (FSW) according to their geographical area of origin.

Cinta Folch; Cristina Sanclemente; Anna Esteve; Elisa Martró; Sonia Molinos; Jordi Casabona

2009-01-01

11

Petrography of Mayan mortar, Isla Mujeres, Quintana Roo, Mexico  

SciTech Connect

Along coastal regions of the Yucatan Peninsula Mayan builders used a mixture of beach sand, shell fragments, and clasts of rock as mortar for construction. With exposure to subaerial conditions, the aragonitic sand was converted into a semi-lithified mortar. Petrographic analysis of mortar samples collected from Mayan ruins on the south end of Isla Mujeres indicates that the mortar is cemented by blocky, meniscus style, low Mg calcite. In addition to the cement, low Mg calcite also occurs as blocky equant crystals either replacing grains or filling grain-moldic porosity. X-ray analysis of both modern beach sand and mortar shows the sand is composed of aragonite and high Mg calcite but lacks low Mg calcite. Mortar, on the other hand, consists of low Mg calcite, high Mg calcite, and aragonite however aragonite is much less abundant than in the sand. Aragonitic ooids, pellets and bioclasts of beach sand used in mortar were dissolved producing moldic porosity. At the same time, CaCO/sub 3/ derived from this process was precipitated as low Mg calcite which formed meniscus cement and filled moldic porosity within the walls of Mayan structures producing a remarkably hard mortar.

Bain, R.J.

1985-01-01

12

Segmentadas y segregadas: las mujeres en la fuerza de trabajo en Venezuela Segmented and segregated: Women in the Venezuelan workforce  

Microsoft Academic Search

This article describes the main aspects of women's insertion into the workforce, in both the formal and informal sectors, and aims to provide insight into the different gender-derived inequities in the Venezuelan employment market. Women's invol- vement in the workplace continues to grow, yet this growth is highly concentrated in the informal sector. In the nineties, this presence rose by

Jacqueline Richter

13

La vulnerabilidad e invisibilidad de las mujeres ante el VIH\\/SIDA: constantes y cambios en el tema  

Microsoft Academic Search

This paper presents some thoughts on the problems endured by women facing HIV\\/AIDS. World and nationwide statistics show an upward trend of the epidemic among women, calling for the need to address this problem. A case is made for the way in which gender structure and relations facilitate the vulnerability of women to this disease, increasing their risk of infection

Cristina Herrera; Lourdes Campero

2002-01-01

14

ENTRENAMIENTO DE LAS HABILIDADES SOCIALES  

Microsoft Academic Search

No es ningún secreto que una de las partes más importantes de nuestra vida son las relaciones sociales. En cada una de las cosas que hacemos hay un componente de relaciones con los demás que determina en gran medida (facilitando o entorpeciendo) nuestra búsqueda de la felicidad. Es creencia común que las simpatía y el atractivo social de algunas personas

Nuria María Palanco López

2009-01-01

15

Las Vegas Strip History  

NSDL National Science Digital Library

Created by amateur cultural historian Deanna DeMatteo, this site offers "the most detailed history of the Las Vegas Strip on the Internet today," showing in words and graphics the evolution of the properties on the Strip from its beginning to the present. Drawing on materials provided by publications, professional Las Vegas historians, and the Nevada State Museum and Historical Society, DeMatteo offers a detailed, noncommercial history with plenty of photographs (many archival) of the strip from the first night club in 1930 named Pair O Dice to the first true casino hotel, El Rancho with 63 rooms in 1941, to Hilton's giant Paris Las Vegas opening earlier this Fall with 2,914 rooms. There is also a special topics section, covering people significant in the strip's development, such as Warren "Doc" Bayley and Howard Hughes. Launched in August, the Website is continually updated with new material. Note: to reach table of contents, click on the photograph at end of the homepage.

Dematteo, Deanna.

16

AMBIVALÊNCIA EM MULHERES SUBMETIDAS A LAQUEADURA TUBÁRIA Ambivalence in women submitted to tubal ligation Ambivalencia en mujeres sometidas a ligación de trompas  

Microsoft Academic Search

Resumen Estudio exploratorio, en que se utilizó la base de datos de una investigación con mujeres sometidas a ligadura de trompas, para determinar, con mayor precisión, la frecuencia de mujeres ambivalentes y analizar la distribución estadística de estas mujeres de acuerdo con variables seleccionadas y la forma en que originalmente se habían clasificado en respecto al procedimiento (totalmente o moderadamente

Gonçalves GAA; Garcia TR; Coelho EAC; Telma Ribeiro Garcia; Gleice Adriana Araújo Gonçalves

17

History: Las Vegas  

NSDL National Science Digital Library

Las Vegas (or "The Meadows" in Spanish) is a curious place, and it is not much of a stretch to say that it was transformed from a sleepy railroad town into a ring-a-ding swinging town in just a few decades during the 20th century. The Las Vegas Sun has gone above and beyond the call of duty by crafting a site that presents a multimedia-rich experience that narrates the history of this rather unique American city. Visitors should start their journey here by watching one or all eleven parts of their "Boomtown" video on the history of the town. Then visitors may want to take a look at the interactive map of the "Strip", which tells the fortunes of casinos and other buildings, past, present, and future, which have graced this notable region of mega-structures amidst the desert. After that, visitors should look at the "12 Voices from the Past" area. Voices like casino owner Benny Binion and former Nevada governor Mike O'Callaghan are featured here, and it's a great trip back through the city's varied past.

18

Las paradas repentinas y las estrategias cambiarias en América Latina  

Microsoft Academic Search

(Disponible en idioma inglés únicamente) Un análisis de varios estudios de casos específicos en la región sugiere que la capacidad de sostener una política monetaria creíble depende del grado de vulnerabilidad de los países a las repercusiones de las paradas repentinas. A este respecto, hay cuatro aspectos de vital importancia que atenúan esas repercusiones. La apertura de la economía de

Arturo Galindo; Alejandro Izquierdo

2003-01-01

19

LAS and its disciplinary ambitions  

Microsoft Academic Search

Since the late 1980s and early 1990s, Language and Academic Skills (LAS) practitioners have been vitally interested in legitimating LAS knowledge, practices, and academic identity, primarily to counter institutional marginalisation and institutional misperceptions of who we are and what we do. In the quest for legitimation we have become involved in the process of organising our professional lives (Becher, 1989,

Stephen Milnes

20

Apropiación y masificación de las tecnologías de la información y las comunicaciones (TIC) en las Mipyme  

Microsoft Academic Search

Innumerables son los beneficios que el uso de las tecnologías de la información y las comunicaciones (TIC) deriva en los procesos empresariales siendo de mayor relevancia el incremento en ventas, la disminución de costos totales, mejora en satisfacción de clientes y proveedores, mayor eficiencia, optimización de la educación del personal, mejoramiento de la comunicación con stakeholders y presencia global. Sin

GERMAN ELIECER RODRIGUEZ MELO

2011-01-01

21

Informe a la nación indica que continúa la disminución de las tasas de mortalidad por cáncer que empezó a principios de los noventa; Una sección especial destaca los cánceres asociados al exceso de peso y a la falta de actividad física adecuada  

Cancer.gov

Los índices de mortalidad por todos los cánceres combinados para hombres, mujeres y niños siguieron bajando en Estados Unidos entre 2004 y 2008, según el Informe Anual a la Nación sobre el Estado del Cáncer de 1975 a 2008. El índice general de diagnósticos nuevos de cáncer, que se conoce también como incidencia, bajaron entre los hombres un promedio de 0,6% por año entre 2004 y 2008. Los índices generales de incidencia de cáncer entre las mujeres bajaron 0,5% por año de 1998 hasta 2006; estos índices se nivelaron de 2006 a 2008.

22

EMPACT: THE LAS VEGAS INTERAGENCY PILOT PROGRAM  

EPA Science Inventory

ENPACT: The Las Vegas Interagency Pilot Project The Las Vegas Interagency Pilot Project of the EMPACT program has involved eleven efforts. These efforts are described in brief on the poster presentation. They include: Las Vegas Environmental Monitoring Inventory, the Qual...

23

Las perspectivas de las zonas económicas especiales de exportación  

Microsoft Academic Search

Con base en la actual globalización mundial de la economía y de la interdependencia comercial, tecnológica y financiera de los países y de la experiencia de la apertura económica de China, el gobierno colombiano propone la creación de las Zonas Económicas Especiales de Exportación, ZEEE, en los departamentos de Nariño, Valle del Cauca, Norte de Santander y Cesar para aumentar

Alexander Arévalo Luna; Paula Lucia Arevalo M

2002-01-01

24

Síntomas neurológicos de las enfermedades reumáticas  

Microsoft Academic Search

Resumen Una de las más importantes pero la menos co- mún de las manifestaciones de enfermedad autoinmune la constituye la vasculitis, la cual mo- difica la historia de la enfermedad, dependiendo del órgano afectado. Esta revisión incluye las más importantes manifestaciones y complicaciones de los sistemas nerviosos central y periférico que se desarrollan por vasculitis en las enfermedades reumáticas, ya

2007-01-01

25

Género, Clase, Etnia y Raza en la Presentación de la Mujer Inmigrante y Extranjera en Argentina (1880- 1930)  

Microsoft Academic Search

My dissertation “Género, clase, etnia y raza en la (re) presentación de la mujer inmigrante y extranjera en Argentina (1880 -1930),” studies the various ways in which the representation of immigrant and foreign women, who arrived to Argentina between 1880 and 1930, were shaped by the modalities of gender, race, ethnicity, and class in literary and visual texts. I approach

Alejandra Karina Carballo

2006-01-01

26

The Role Of Women In Popular Education In Bolivia: A Case Study Of The "Oficina Juridica Para La Mujer"  

ERIC Educational Resources Information Center

|This study examines how the Education Office of the "Oficina Juridica Para la Mujer" [Women's Legal Office] , a community-based popular education organization in Cochabamba, Bolivia, works with women to address personal, legal, and policy issues through local leadership training and popular education methodology. We investigate the…

Kollins, Judith M.; Hansman, Catherine A.

2005-01-01

27

Mecanismos psicofisiológicos implicados en la regulación afectiva y la restricción alimentaria de mujeres con riesgo de padecer bulimia nerviosa  

Microsoft Academic Search

El objetivo del estudio fue conocer el efecto de visualizar imágenes de comida bajo diferentes estados de ánimo y diferentes condiciones de restricción alimentaria en la modulación emocional de dos refle- jos defensivos (sobresalto motor y defensa cardiaca). 72 mujeres con riesgo de padecer bulimia ner- viosa fueron asignadas a dos grupos: 1) un grupo al que se inducía un

Sonia Rodríguez; José Luis Mata; Silvia Moreno; Jaime Vila

2007-01-01

28

Las Mujeres: Mexican American/Chicana Women. Photographs and Biographies of Seventeen Women from the Spanish Colonial Period to the Present. Revised Edition.  

ERIC Educational Resources Information Center

This booklet presents the lives of 17 Mexican American women and institutions that have made significant contributions to Mexican society from past to present day culture. The biographies cover the following women and institutions: Eulalia Arrila de Perez, Dona Maria del Carmen Calvillo, Jovita Idar, Maria Hernandez, Alicia Dickerson Montemayor,…

Ruthsdotter, Mary

29

El consumo femenino de la imagen de la mujer en la publicidad. El sexismo en las campañas publicitarias rechazadas por la audiencia  

Microsoft Academic Search

This article presents the results of research into the perceptions and attitudes of women with regard to gender\\u000arepresentations in advertising discourse. This study is\\u000apart of a research project begun in 2005 on the subject of\\u000athe consumption of the image of women in advertising\\u000aand the media carried out by the Catalan Institute of\\u000aWomen (ICD) of the

Nuria García-Muñoz; Luisa Martínez

2008-01-01

30

LAS HABILIDADES DE INTERACCIÓN SOCIAL Y LA PREPARACIÓN DE LAS FAMILIAS DE LOS NIÑOS Y DE LAS NIÑAS CON DIAGNÓSTICO PRESUNTIVO DE RETRASO MENTAL DESDE LAS PRIMERAS EDADES  

Microsoft Academic Search

Las habilidades sociales son un numeroso y variado conjunto de conductas que se ponen en juego en situaciones de interacción social, es decir, en situaciones en las que hay que relacionarse con otras personas. La Interacción social se refiere a las conductas necesarias para interactuar y relacionarse con los iguales y con los adultos de forma efectiva y mutuamente satisfactoria.

Elizabeth Gómez Núñez; Olga Lidia Núñez Rodriguez; Nemesio Jiménez Cepero; Ángel Luis Gómez Cardoso

2011-01-01

31

ROL DE LAS ALTERNATIVAS EN LA NEGOCIACIÓN  

Microsoft Academic Search

Teniendo en cuenta que el mundo está atravesando una veloz y profunda transformación; es importante considerar que para poder afrontar tales cambios la negociación racional, inteligente y profesionalizada constituye un elemento imprescindible para la sociedad, donde deben asumirse métodos adecuados para la administración y solución de conflictos. Las personas, los gobiernos y las organizaciones han tomado conciencia y madurado de

Marilyn López Molina; Zoila Banguela Villavicencio

2009-01-01

32

Las infecciones emergentes transmitidas por garrapatas  

Microsoft Academic Search

ResumenLas infecciones transmitidas por garrapatas aparecen por todo el mundo y son bien conocidas desde hace más de 100 años. Algunas enfermedades transmitidas por garrapatas son muy comunes mientras que otras son extremadamente raras. Las técnicas genéticas moleculares modernas (y la mayor disponibilidad de la reacción en cadena de la polimerasa) han llevado al descubrimiento y la clasificación de nuevos

Ingomar Mutz

2009-01-01

33

Variación temporal de las constantes fundamentales  

Microsoft Academic Search

La variación temporal de las constantes fundamentales es un problema que ha motivado numerosos trabajos teóricos y experimentales desde la hipótesis de los grandes números de Dirac en 1937. Entre los métodos experimentales y observacionales para establecer restricciones sobre la variación de las constantes fundamentes es importante mencionar: comparación entre relojes atómicos[1], métodos geofísicos[2][3], análisis de sistemas de absorción en

S. J. Landau; H. Vucetich

1999-01-01

34

Conservación y Acondicionamiento de las Raíces Frescas  

Microsoft Academic Search

La yuca (Manihot esculenta) es un alimento importante porque es fuente económica de calorías, especialmente para las gentes de pocos recursos económicos que habitan las regiones tropicales del mundo. Por tal razón, los científicos han hecho grandes esfuerzos para desarrollar variedades de mayor rendimiento y para diseñar tecnologías apropiadas de bajos insumos que mejoren la producción del cultivo. La aplicación

Teresa Sánchez; Lisímaco Alonso

35

Las Vegas Basin Seismic Response Project: Preliminary Results From Seismic Refraction Experiments, Las Vegas, NV  

Microsoft Academic Search

In May and September 2002, seismic refraction data were acquired in the Las Vegas basin. Located in the southern Basin and Range province, the cities of Las Vegas, North Las Vegas, and Henderson sit atop a fault-bounded basin with a depth of up to 5 km and basin dimensions of roughly 60 km wide (east-west) by 50 km in length

S. A. Zaragoza; C. M. Snelson; S. H. Harder; G. Kaip; B. Luke; B. J. Buck; A. D. Hanson

2002-01-01

36

UNA ESTIMACIÓN DE LAS NECESIDADES DE GASTO DE LAS COMUNIDADES AUTÓNOMAS  

Microsoft Academic Search

El objetivo de este trabajo consiste en realizar un cálculo de las necesidades de gasto relativas de las Comunidades Autónomas. El método propuesto en el trabajo se basa en la descomposición del índice de necesidades de gasto en una suma de los índices de necesidades de las distintas funciones de gasto, ponderados según su peso en un “presupuesto de gasto

Antoni Castells Oliveres

2001-01-01

37

Haga un mantenimiento adecuado de las cortadoras ...  

Center for Food Safety and Applied Nutrition (CFSAN)

... Las cortadoras de embutidos que se usan generalmente para cortar carnes rojas, quesos, frutas y verduras en los establecimientos minoristas y de ... More results from www.fda.gov/food/guidanceregulation/retailfoodprotection

38

Degradation analysis of linear alkylbenzene sulfonates (LAS)  

SciTech Connect

The degradation of mixtures of sodium salts of butyl-, decyl-, and dodecylbenzene sulfonate was studied as influenced by shaking for seven days, by the addition of soil and sand, and by changes in pH. LAS were analyzed by measurement of the absorbance at 223 nm or by reaction with methylene blue and measurement of the absorbance at 652 nm. Slurries containing 48.0 g/l. and 6.6 g/l. of LAS degraded at room temperature, which suggested a simple chemical decomposition of the LAS to simpler products since these concentrations prohibited microbial activity. None of the treatments significantly aided the degradation process, except the addition of soil, i.e., the addition of a source of microorganisms. Contrary to the LAS slurry data, the dodecylbenzene sulfonate solution did not degrade even after aging for 30 days; however, it degraded completely after 7 days on the addition of a glucose and nutrient solution.

Sandhu, S.S.; Warren, W.J.; Reed, A.

1980-01-01

39

Are LAS-codes a miracle ?  

Microsoft Academic Search

Large area synchronized (LAS)-CDMA has been proposed to enhance third generation and fourth generation wireless systems. LAS-CDMA is based on multiple access codes that result from a combination of LA codes and pulse compressing LS codes. To reduce multiple access interference and intersymbol interference in time dispersive channels, LS codes have perfect auto-correlation and cross-correlation functions in a certain vicinity

S. Stanczak; H. Boche; M. Haardt

2001-01-01

40

LAS INSTITUCIONES CULTURALES Y SU ACCIONAR EN LAS TRADICIONES MUSICALES. VISTO DESDE UNA PERSPECTIVA SOCIOLÓGICA  

Microsoft Academic Search

En Cuba, la preservación del patrimonio intangible, es decir, de la cultura popular y tradicional, las tradiciones orales, musicales, danzarías, etc., tienen una gran importancia en la vida de nuestras comunidades, particularmente en las zonas rurales. Para una mejor comprensión de la problemática los estudios se centran en la labor de la institución cultural y sus influencias en el desarrollo

Jaime Tamayo Rodríguez; Eyedelkis Medina García; Raida Rodríguez Noa

2012-01-01

41

Calendario sobre el Tiempo y las Estaciones  

NSDL National Science Digital Library

Este Web site contiene links a 12 calendarios (12 meses). Diciembre contiene siete actividades que combinan matemáticas con el tiempo y las estaciones. Por ejemplo, los chicos investigan a qué hora se pone el sol hoy, evalúan su día, o calculan cuántos días quedan para las vacaciones escolares. Se puede utilizar como actividad independiente, como actividad para hacer en casa, o como actividad de grupo. Disponible para descargar en formato pdf y en Inglés.

Terc

2010-01-01

42

Las Vegas bets on a sure winner  

SciTech Connect

To protect the quality of Lake Mead and Las Vegas Wash in Nevada, six water treatment alternatives and three wastewater treatment plants in the Las Vegas Valley were analyzed. The treatment plants and the treatment alternatives are described. Studies on cost-effectiveness, functional limitations, environmental impact, and energy-efficiency of the treatment alternatives are discussed. The low lime treatment mode should be used initially at area treatment facilities because of its proven dewatering characteristics, and the alum treatment mode should receive further testing. (4 diagrams, 1 map, 2 photos, 6 tables)

Gilbert, J.B.; Culp, G.L.; Salo, J.E.

1980-09-01

43

Alcoholism and Drug Abuse in Las Juntas  

Microsoft Academic Search

Background: Originally, while in Costa Rica I wanted to investigate alcoholism and drug addiction within the Las Juntas community. Specifically, I wanted to look at addiction as it pertains to the mining community in comparison with the rest of the public. I hypothesized that there may be cultural influences from the mining community, that may correlate with alcoholism and drug

Suzanne Wasserman

44

Optimal Speedup of Las Vegas Algorithms  

Microsoft Academic Search

Let A be a Las Vegas algorithm, i.e., A is a randomized algorithmthat always produces the correct answer when it stops but whose runningtime is a random variable. We consider the problem of minimizingthe expected time required to obtain an answer from A using strategieswhich simulate A as follows: run A for a fixed amount of timet 1 , then

Michael Luby; Alistair Sinclair; David Zuckerman

1993-01-01

45

Evaluating Las Vegas Algorithms: Pitfalls and Remedies  

Microsoft Academic Search

Stochastic search algorithms are among the most sucessful approaches for solving hard combinato- rial problems. A large class of stochastic search approaches can be cast into the framework of Las Vegas Algorithms (LVAs). As the run-time be- havior of LVAs is characterized by random vari- ables, the detailed knowledge of run-time distri- butions provides important information for the analysis of

Holger H. Hoos; Thomas Stützle

1998-01-01

46

Las Brigadas Internacionales: una aproximación historiográfica  

Microsoft Academic Search

El artículo consta de dos apartados. Al primero le hemos dado un enfoque cronològico, distinguiendo tres etapas: a) las obras publicadas por ambos bandos con finalidad propagandistica durante la Guerra Civil; b) de los anos cuarenta hasta los ochenta, en que observamos que se camina desde la vision mítica hasta los primeros estúdios críticos; c) a partir de 1996, con

Manuel Requena Gallego

2004-01-01

47

The Man and Las Tablas de Daimiel  

Microsoft Academic Search

\\u000a Human settlement in Las Tablas de Daimiel started 3600 years BP and developed into a rich culture of hunters, fishermen and\\u000a plant and animal gatherers that survived until the last third of the twentieth century. Very recently, unsustainable economic\\u000a development in the catchment resulted in strong pollution and depletion of water resources, forcing people to leave, impairing\\u000a the wetland ecological

M. Alvarez-Cobelas; S. Cirujano; A. Meco

48

Pressure leaching las cruces copper ore  

NASA Astrophysics Data System (ADS)

A hydrometallurgical process was developed for treating the Las Cruces massive sulfide-ore deposit located near Seville, Spain. A two-stage countercurrent leach process, consisting of an atmospheric leach and a pressure leach, was developed to effectively leach copper from the copper-bearing minerals and to generate a solution suitable for the subsequent solvent-extraction and copper-electrowinning operations. The results of batch and continuous miniplant tests are presented.

Berezowsky, R. M.; Xue, T.; Collins, M. J.; Makwana, M.; Barton-Jones, I.; Southgate, M.; Maclean, J. K.

1999-12-01

49

Impact of Mano a Mano-Mujer, an HIV prevention intervention, on depressive symptoms among Chilean women.  

PubMed

Worldwide, and in Chile, the number of women living with HIV is increasing. Depression is considered a factor that interferes with HIV prevention. Depression may reach 41% among low-income Chilean women. Depressed people are less willing to participate in behaviours that protect them against HIV. The aim of this study is to analyze the impact of Mano a Mano-Mujer (MM-M), and HIV prevention intervention, on depressive symptoms among Chilean women. A quasi-experimental design was used for this study. The research was conducted in Santiago, Chile; a total of 400 women participated in the study (intervention group, n=182; control group, n=218). The intervention was guided by the social-cognitive model and the primary health care model. The intervention consists of six 2-h sessions delivered in small groups. Sessions covered: HIV prevention, depression, partner's communication, and substance abuse. Face-to-face interviews were conducted at baseline and at 3-month follow-up. Chilean women who participated in MM-M significantly decreased, at 3 months follow up, their reported depressive symptoms. MM-M provided significant benefits for women's depression symptoms. In this study nurses participated as leaders for the screening of depressive symptoms and as facilitators of community interventions. PMID:22452388

Cianelli, R; Lara, L; Villegas, N; Bernales, M; Ferrer, L; Kaelber, L; Peragallo, N

2012-03-27

50

LAS MEDICINAS EN MI CASA Información para adultos sobre ...  

Center for Drug Evaluation (CDER)

Text Version... Dolores y fiebre son algunas de las razones más comunes por el cual las personas usan medicinas sin receta o de venta libre. ... More results from www.fda.gov/downloads/drugs/resourcesforyou

51

Geologic Studies for Seismic Hazard Assessment, Las Positas Fault Zone.  

National Technical Information Service (NTIS)

Since its existence was reported, the northeast trending Las Positas Fault Zone has been the subject of controversy. Because of proximity of the Las Positas Fault to Lawrence Livermore National Laboratory (LLNL) facilities, geologists from the Laboratory ...

D. W. Carpenter R. J. Clark

1982-01-01

52

Regulation of las and rhl Quorum Sensing in Pseudomonas aeruginosa  

Microsoft Academic Search

The production of several virulence factors by Pseudomonas aeruginosa is controlled according to cell density through two quorum-sensing systems, las and rhl. The las system is comprised of the transcriptional activator protein LasR and of LasI, which directs the synthesis of the autoinducer PAI-1. Similarly, the rhl system consists of the transcriptional activator protein RhlR and of RhlI, which directs

EVERETT C. PESCI; JAMES P. PEARSON; PATRICK C. SEED; BARBARA H. IGLEWSKI

1997-01-01

53

Acompañamiento de la ciencia colombiana a las políticas públicas  

Microsoft Academic Search

Este artículo analiza el acompañamiento que la investigación científica promovida por COLCIENCIAS ha realizado a las políticas públicas en Colombia, en especial las referidas al bienestar social. A través de un doble análisis cualitativo y cuantitativo, se evalúa la distribución y la cobertura temática de algunas de las investigaciones realizadas entre 1990 y 2002, en los diversos tópicos asociados con

Sergio Riaga; Ana María Villa; María Velasco

2004-01-01

54

LA INFLUENCIA DE LA CONFIANZA Y EL COMPROMISO SOBRE LAS FUNCIONES CREADORAS DE VALOR EN LAS RELACIONES COMERCIALES ENTRE EMPRESAS  

Microsoft Academic Search

El propósito de este trabajo es estudiar el efecto de la confianza y el compromiso sobre la creación de valor para el cliente. Para ello primero se examinan las distintas funciones creadoras de valor en las relaciones comerciales entre empresas. A continuación se plantea el modelo teórico que conecta la confianza y el compromiso con las funciones creadoras de valor.

J. A. López Sánchez; M. L Santos Vijande; J. A. Trespalacios Gutiérrez

2008-01-01

55

Advanced Airborne CO2 LAS System  

NASA Astrophysics Data System (ADS)

A unique airborne Laser Absorption Spectroscopy (LAS) system has been developed by ITT Space Systems, LLC to address the needs of the National Research Council Decadal Survey Tier 2 mission for Active Sensing of CO2 Emissions over Nights, Days and Seasons (ASCENDS). This instrument has undergone multiple airborne field tests in cooperation with our partners at NASA Langley Research Center (LaRC). The instrument was built largely with off-the-shelf components and uses high reliability telecom components, including lasers, modulators and fiber amplifiers as the transmitter. Multiple wavelengths are transmitted simultaneously from a single collimator and the return signal is collected by a simple 8” telescope that is fiber coupled to a HgCdTe APD. The analog signal is sampled with a high resolution scope card housed in a National Instruments PXI chassis and the digitized signal is then passed through our custom-built software-based lock-in processing system which allows separation of the signals from the individual wavelengths. The separated signals are then used in the standard Differential Absorption Lidar (DIAL) relations to determine the integrated column differential optical depth. This presentation will give a detailed overview of this multi-frequency, single-beam, synchronous lock-in LAS instrument including the basic methodology of the measurement. Recent improvements in the lock-in methodology designed to eliminate the effects of multi- path fading and frequency dependence of the electronic components will also be discussed.

Dobler, J. T.; Braun, M. G.; McGregor, D. P.; Erxleben, W. H.; Browell, E. V.; Harrison, F. W.

2009-12-01

56

Las Vegas Basin Seismic Response Project: Preliminary Results From Seismic Refraction Experiments, Las Vegas, NV.  

NASA Astrophysics Data System (ADS)

In May and September 2002, seismic refraction data were acquired in the Las Vegas basin. Located in the southern Basin and Range province, the cities of Las Vegas, North Las Vegas, and Henderson sit atop a fault-bounded basin with a depth of up to 5 km and basin dimensions of roughly 60 km wide (east-west) by 50 km in length (north-south). Previous isostatic gravity, seismic reflection, and aeromagnetic studies indicate that a series of sub-basins exist beneath the unconsolidated basin fill, with the deepest sub-basin occurring 5 km west of the fault block bounding the eastern edge of the basin (Frenchman Mountain). The basin is significantly deeper along its northern extremity, following the path of the fault block bounding the northern edge of the basin (Las Vegas Valley Shear Zone), and along the western edge of Frenchman Mountain. Recent, paleoseismic studies have indicated that faults in the Las Vegas region have the potential for an earthquake of M6.5 to 7.0. It is estimated that a M6.9 earthquake in the basin could produce about 11 billion dollars in damage and a significant number of deaths and/or injuries. In addition, an equivalent or larger event in the Death Valley fault zone, 150 km distance, would also be devastating to the metropolitan area of approximately 1.5 million residents. Therefore, it is essential to understand the seismic hazard posed to the Las Vegas region. This project is part of a larger collaborative effort to characterize the basin and its response to ground shaking. The University of Nevada, Las Vegas with assistance from the University of Texas at El Paso, students from UNLV and UTEP, volunteers from the community and several students from Centennial High school deployed 432 portable seismic recorders ("Texans") throughout the valley. Shot point locations were located at three quarries in the valley, one to the north, one to the east and one to the southwest. The profiles cross the Las Vegas Valley Shear zone as well as a prominent NW/SE trending step in the basin floor across which the basement drops from 2 to 4 km in depth. In addition, the profiles cross several Quaternary fault scarps, which have recently been identified as tectonic in origin. Preliminary analyses of the seismic refraction data indicate that the basin has an average P-wave velocity of 4.5 km/s and is in agreement with the estimated basin depths from isostatic gravity studies (2 to 5 km depth). Both tomographic inversion and forward modeling techniques are being used to analyze these data. These data will be used to produce a velocity model of the basin and image the basin/bedrock contact. In addition, these data will be integrated into a community model, which is being produced by the Las Vegas Basin Seismic Response working group to further assess the site response of the basin.

Zaragoza, S. A.; Snelson, C. M.; Harder, S. H.; Kaip, G.; Luke, B.; Buck, B. J.; Hanson, A. D.

2002-12-01

57

HISTÓRIA ORAL DE MULHERES COM FILHOS PORTADORES DE SÍNDROME DE DOWN ORAL HISTORY OF WOMEN WITH CHILDREN WITH DOWN SYNDROME HISTORIA ORAL DE LAS MUJERES CON HIJOS QUE TIENEN SÍNDROME DE DOWN  

Microsoft Academic Search

RESUMO: Este estudo buscou conhecer e compreender o processo de construção social da identidade de mulheres com filhos portadores de Síndrome de Down. Trata-se de um estudo de caso denominado história oral, realizado com três mulheres através de entrevista semi-estruturada, em setembro de 2007. Na análise de conteúdo temática emergiram sete categorias: Descoberta, Necessidades, Dificuldades, Falta de orientação, Informação sobre

Josete Boff; Rita Catalina; Aquino Caregnato; Caregnato RCA

58

Adsorption of linear alkylbenzene sulfonate (LAS) on soils  

Microsoft Academic Search

Experimental measurements of the adsorption of linear alkylbenzene sulfonate (LAS) on soils were made at 25°C using a continuous adsorption apparatus. The adsorption of LAS on natural soils could be divided into two stages: linear and exponentially increasing isotherms. At low LAS concentration (< 90 ?g ml?1), the adsorption isotherms were linear and Kd was among 1.2 to 2.0. At

Ziqing Ou; Ayfer Yediler; Yaowu He; Liangqing Jia; Antonius Kettrup; Tieheng Sun

1996-01-01

59

Estrategias sobre innovacion en las empresas multinacionales agroalimentarias  

Microsoft Academic Search

Las multinacionales agroalimentarias son las principales innovadoras del sector agroalimentario mundial y agentes econ�micos fundamentales del cambio tecnol�gico en el sector agroalimentario espa�ol. El estudio del comportamiento innovador de las multinacionales agroalimentarias presenta inter�s puesto que el 50% de la tecnolog�a relacionada mundialmente con la alimentaci�n procede de este tipo de empresas. Bas�ndonos en una muestra de m�s de 16.000

Ruth Rama; Oscar Alfranca; Nicholas von Tunzelmann

2003-01-01

60

Las Cumbres Observatory Global Telescope Network  

NASA Astrophysics Data System (ADS)

Las Cumbres Observatory Global Telescope (LCOGT) is a young organization dedicated to time-domain observations at optical and (potentially) near-IR wavelengths. To this end, LCOGT is constructing a worldwide network of telescopes, including the two 2 m Faulkes telescopes, as many as 17 × 1 m telescopes, and as many as 23 × 40 cm telescopes. These telescopes initially will be outfitted for imaging and (excepting the 40 cm telescopes) spectroscopy at wavelengths between the atmospheric UV cutoff and the roughly 1-?m limit of silicon detectors. Since the first of LCOGT''s 1 m telescopes are now being deployed, we lay out here LCOGT''s scientific goals and the requirements that these goals place on network architecture and performance, we summarize the network''s present and projected level of development, and we describe our expected schedule for completing it. In the bulk of the paper, we describe in detail the technical approaches that we have adopted to attain desired performance. In particular, we discuss our choices for the number and location of network sites, for the number and sizes of telescopes, for the specifications of the first generation of instruments, for the software that will schedule and control the network''s telescopes and reduce and archive its data, and for the structure of the scientific and educational programs for which the network will provide observations.

Brown, T. M.; Baliber, N.; Bianco, F. B.; Bowman, M.; Burleson, B.; Conway, P.; Crellin, M.; Depagne, É.; De Vera, J.; Dilday, B.; Dragomir, D.; Dubberley, M.; Eastman, J. D.; Elphick, M.; Falarski, M.; Foale, S.; Ford, M.; Fulton, B. J.; Garza, J.; Gomez, E. L.; Graham, M.; Greene, R.; Haldeman, B.; Hawkins, E.; Haworth, B.; Haynes, R.; Hidas, M.; Hjelstrom, A. E.; Howell, D. A.; Hygelund, J.; Lister, T. A.; Lobdill, R.; Martinez, J.; Mullins, D. S.; Norbury, M.; Parrent, J.; Paulson, R.; Petry, D. L.; Pickles, A.; Posner, V.; Rosing, W. E.; Ross, R.; Sand, D. J.; Saunders, E. S.; Shobbrook, J.; Shporer, A.; Street, R. A.; Thomas, D.; Tsapras, Y.; Tufts, J. R.; Valenti, S.; Vander Horst, K.; Walker, Z.; White, G.; Willis, M.

2013-09-01

61

El impacto de las reformas estructurales en la agricultura colombiana  

Microsoft Academic Search

Colombia, como la mayor parte de los países latinoamericanos, emprendió un ambicioso proceso de liberalización y reformas al clarear la década de los años noventa, el cual cobijó al sector agropecuario. Las reformas en el agro tuvieron tres períodos: desde el segundo semestre de 1990 hasta finales de 1992 se pusieron en marcha la mayoría de las reformas iniciales, de

Santiago Perry

2000-01-01

62

GIS Methodology for Quantifying Channel Change in Las Vegas, Nevada  

Microsoft Academic Search

This study applies spatial analyses to examine the consequences of accelerated urban expansion on a hydrologic system over a period of 24 years. Three sets of historical aerial photos are used in a GIS analysis to document the geomorphic history of Las Vegas Wash, which drains the rapidly growing Las Vegas urban area in southern Nevada. New spatial techniques are

Susan E. Buckingham; John W. Whitney

2007-01-01

63

Las denuncias que reciben las empresas: ¿se relacionan con la percepción de prestigio que poseen? Análisis en empresas argentinas  

Microsoft Academic Search

El trabajo tiene por objeto determinar a partir de un análisis no paramétrico utilizando el método de la r de Spearman, la existencia de una relación entre la percepción que el público tiene sobre las empresas y la cantidad de denuncias que reciben. El análisis efectuado se centra en el estudio de dos variables: el prestigio de las empresas, por

Fernando G. Torres

2008-01-01

64

Fate of linear alkylbenzene sulfonate (LAS) in activated sludge plants.  

PubMed

Monitoring data were collected in a pilot-scale municipal activated sludge plant to assess the fate of the C12-homologue of linear alkyl benzene sulfonate (LAS-C12). The pilot-plant was operated at influent LAS-C12 concentrations between 2 and 12 mg l(-1) and at sludge retention times of 10 and 27 days. Effluent and waste sludge concentrations varied between 5 and 10 microg l(-1) and between 37 and 69 microg g(-1) VSS, respectively. In the sludge samples only 2-8% was present as dissolved LAS-C12, whereas the remaining 92-98% was found to be adsorbed to the sludge. In spite of this high degree of sorption, more than 99% of the LAS-C12 load was removed by biodegradation, showing that not only the soluble fraction but also the adsorbed fraction of LAS-C12 is readily available for biodegradation. Sorption and biodegradation of LAS-C12 were also investigated separately. Sorption was an extremely fast and reversible process and could be described by a linear isotherm with a partition coefficient of 3.2 l g(-1) volatile suspended solids. From the results of biodegradation kinetic tests it was concluded that primary biodegradation of LAS-C12 cannot be described by a (growth) Monod model, but a secondary utilisation model should be used instead. The apparent affinity of the sludge to biodegrade LAS-C12 increased when the sludge was loaded with higher influent concentrations of LAS-C12. PMID:14769410

Temmink, H; Klapwijk, Bram

2004-02-01

65

El impacto de las crisis de subsistencias de la década de 1850 en el País Vasco  

Microsoft Academic Search

Este artículo analiza las últimas crisis de subsistencias en el País Vasco antes de la construcción de los ferrocarriles. Distingue el impacto en las zonas productoras (de trigo y\\/o de maíz) y en las ciudades. En dos de éstas, a pesar de la imagen de paz social transmitida por las autoridades fueristas vascas, las subsistencias suscitaron movilizaciones populares, sólo en

Rafael Ruzafa Ortega

2004-01-01

66

Environmental behavior of linear alkylbenzene sulfonate (LAS) in aquatic ecosystem  

NASA Astrophysics Data System (ADS)

LAS degradation rate in Donghu Lake water under aerobic was much faster than under anaerobic condition. The half life of LAS in aerobic and anaerobic environment was 3.2 days and 57 days, respectively. The degradation rate at 25 27°C was approximately 20 times higher than that at 1.5 3.5 °C. In a laboratory model aquatic ecosystem, two stages of bioconcentration in fish, daphnia and snail were observed. The first stage, on second day exposure, resulted from accumulation of intact LAS, and the second stage, on 16th day exposure, was due to metabolites. The bioconcentration factor (BCF) of LAS was extremely low in the muscle of hybrid carp (0.64), but rather high (2485) in the gall bladder.

Zhang, Yongyuan; Tan, Yuyun; Korte, F.

1991-03-01

67

Revisión Previa a la Concesión de la Licencia para las ...  

Center for Biologics Evaluation and Research (CBER)

Text VersionPage 1. Revisión Previa a la Concesión de la Licencia para las Vacunas Preventivas DIAPOSITIVA 1 Esta presentación ... More results from www.fda.gov/downloads/biologicsbloodvaccines/internationalactivities

68

Current Target Industry Analysis: Las Vegas Metropolitan Area.  

National Technical Information Service (NTIS)

This is the second of three reports dealing with the Las Vegas MSA's economic development potential in support of an overall effort to prepare an environmental impact statement for the proposed underground nuclear waste storage facility at Yucca Mountain....

M. R. Boyle

1988-01-01

69

Discriminación arancelaria y decisiones de localización de las empresas  

Microsoft Academic Search

El objetivo de trabajo es el de analizar los efectos que los procesos de integración económica entre los países tienen sobre las decisiones se toman en forma estratégica. Se justifica que en este contexto el tradicional argumento \\

José Méndez Naya

2006-01-01

70

Fate of linear alkylbenzene sulfonate (LAS) in activated sludge plants  

Microsoft Academic Search

Monitoring data were collected in a pilot-scale municipal activated sludge plant to assess the fate of the C12-homologue of linear alkyl benzene sulfonate (LAS-C12). The pilot-plant was operated at influent LAS-C12 concentrations between 2 and 12mgl?1 and at sludge retention times of 10 and 27 days. Effluent and waste sludge concentrations varied between 5 and 10?gl?1 and between 37 and

H. Temmink; Bram Klapwijk

2004-01-01

71

Photocatalytic Treatment of Linear Alkylbenzene Sulfonate (LAS) in Water  

Microsoft Academic Search

The photocatalytic degradation of aqueous linear alkylbenzene sulfonate (LAS) was studied. Two different photocatalysts, Degussa P25 TiO2 and Hombikat UV 100 TiO2, were used to degrade aqueous linear alkylbenzene sulfonate in slurry batch photoreactors. For a 100 mg\\/L LAS solution based on first–order rate constants, the optimum photocatalyst loading for Degussa P25 TiO2 was 4.0 g\\/L, while for Hombikat UV

Mehrab Mehrvar; Sarah Hatfield Venhuis

2005-01-01

72

Visualizing Large Datasets with LAS and Google Earth  

NASA Astrophysics Data System (ADS)

As experiments and simulations in Earth System Science grow larger and more complex, dataset volumes are growing explosively. Web-based visualization and analysis of these datasets is becoming a challenge due to large amount of data and the limit of network bandwidth. The Live Access Server (LAS) is a highly configurable Web server designed to provide flexible access to visualization and analysis products generated from geo- referenced scientific datasets. In this presentation, we introduce a new capability of LAS for interactively visualizing large datasets by utilizing the view-based refresh queries of Google Earth and the automatic decimation ("striding") capabilities of Ferret. When viewing a high resolution dataset on a global scale it is wasteful of bandwidth to handle the full resolution data. With the striding capability, Ferret selects every nth point along an axis, where n is the striding value. The striding values are dynamically computed based upon the size of the area of interest. The automatic striding approach minimizes the volume of data that need be touched to visualize a large geographic area. Higher resolutions are utilized for smaller areas to reveal the fine structures. The LAS provides this behavior using Google Earth as the user interface. As users zoom or pan on Google Earth, Google Earth interacts with LAS through a Network Link, which contains the URL of a LAS server. When the view inside Google Earth stops for a set number of seconds, it makes a request to a LAS server, sending the LAS server the latitude and longitude boundaries (bounding box) of the area currently in view. The LAS server uses that information to compute stride values, instruct Ferret to generate a visualization for that particular geographic area, and send the resulting image back to Google Earth.

Li, J.; Schweitzer, R.; Hankin, S.; Manke, A.; O'Brien, K.

2007-12-01

73

Airborne Validation of Active CO2 LAS Measurements  

Microsoft Academic Search

A unique, multi-frequency, single-beam, laser absorption spectrometer (LAS) that operates at 1.57 mum has been developed for a future space-based mission to determine the global distribution of sources and sinks of atmospheric carbon dioxide (CO2). A prototype of the space-based LAS system was developed by ITT, and it has been successfully flight tested in seven airborne campaigns conducted in different

E. V. Browell; J. Dobler; S. Kooi; Y. Choi; F. Harrison; B. Moore; T. Zaccheo

2009-01-01

74

Thermal expansion in metal\\/lithia-alumina-silica (LAS) composites  

Microsoft Academic Search

Lithia-alumina-silica (LAS) with metallic dispersions offers a new approach toward near-zero, isotropic, thermal expansion composites. The metallic phase contributes a positive coefficient of thermal expansion (CTE) to the negative CTE of the glass\\/ceramic matrix. In addition, the metal will increase the electrical and thermal conductivities over those of the matrix alone. The LAS system offers tailorable negative CTEs and light

E. G. Wolff

1988-01-01

75

LAS removal and biodegradation in a wastewater treatment plant  

SciTech Connect

Linear alkylbenzene sulfonate (LAS) biodegrades easily and loses it tensioactive properties quickly through a primary biodegradation process, as many works of literature testify. Many studies have been carried out in laboratories or in pilot plants, whereas few have been undertaken in a wastewater treatment plant (WWTP). In Italy, unlike in other countries, no detailed investigation has been made so far to establish LAS biodegradation in real WWTP conditions. EniChem Augusta (EA) and Consorzio Po-Sangone (CPS) have worked together for over two years on this problem, taking into consideration the large and central active sludge WWTP of the metropolitan area of Torino, north of Italy. Specific LAS data have been obtained, using established HPLC techniques, in influent and effluent streams, in the dissolved and adsorbed phases, to reach a complete mass balance. LAS removal >99% and LAS biodegradation of approximately 85% have been observed. Attention also has been given to LAS intermediates of biodegradation, namely the sulfophenyl carboxylates (SPC), using HPLC and GC-MS techniques, the latter after derivatization. The SPCs have been found present only in the waters and not in the adsorbed phases.

Cavalli, L.; Gellera, A.; Landone, A. (EniChem Augusta Industriale, Milano (Italy))

1993-10-01

76

Modeling of Nonpoint Source Pollution in the Las Vegas Valley  

NASA Astrophysics Data System (ADS)

The point sources of pollution (including wastewater treatment plants) within urban areas are well known. However, the contribution of nonpoint source pollution to receiving waterbodies is not as well understood. In this study, the contributions of nonpoint source runoff is evaluated and compared to the loadings from the wastewater treatment facilities in the Las Vegas Valley of southern Nevada. The entire Las Vegas Valley watershed (approximately 2300 square miles) drains to Lake Mead on the Colorado River. Lake Mead is also the main source of drinking water for Las Vegas. Thus, any runoff generated from the Las Vegas Valley could potentially have adverse impact to this drinking water source. A GIS grid based model is developed to calculate total annual nonpoint nutrients and total solid loads from the Las Vegas Valley. The watershed is subdivided and loads are estimated for all land uses. GIS is used to calculate these loads for each grid cell and then ArcView GIS tools are used to track the accumulation of pollutant loads in the storm channel network. This study uses current data obtained from Clark County GIS Management Office and Clark County Regional Flood Control District. The results of this study will assist local and State agencies in developing Total Maximum Daily Loads for the Las Vegas Wash and provide a better understanding of nonpoint source pollution.

Reginato, M.; Piechota, T. C.

2001-12-01

77

77 FR 1720 - Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting, New Mexico  

Federal Register 2010, 2011, 2012, 2013

...DF0000] Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting...Bureau of Land Management (BLM), Las Cruces District Resource Advisory Council (RAC...is January 25, 2012, at the BLM Las Cruces District Office, 1800 Marquess...

2012-01-11

78

77 FR 55225 - Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting, New Mexico  

Federal Register 2010, 2011, 2012, 2013

...DF0000] Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting...Bureau of Land Management (BLM), Las Cruces District Resource Advisory Council (RAC...is September 19, 2012, at the BLM Las Cruces District Office, 1800 Marquess...

2012-09-07

79

76 FR 61379 - Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting, New Mexico  

Federal Register 2010, 2011, 2012, 2013

...XH0000] Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting...Bureau of Land Management (BLM), Las Cruces District Resource Advisory Council (RAC...is October 20, 2011, at the BLM Las Cruces District Office, 1800 Marquess...

2011-10-04

80

40 CFR 81.80 - Las Vegas Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Las Vegas Intrastate Air Quality Control Region. ...Quality Control Regions § 81.80 Las Vegas Intrastate Air Quality Control Region. The Las Vegas Intrastate Air Quality Control...

2010-07-01

81

40 CFR 81.80 - Las Vegas Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 2009-07-01 false Las Vegas Intrastate Air Quality Control Region. ...Quality Control Regions § 81.80 Las Vegas Intrastate Air Quality Control Region. The Las Vegas Intrastate Air Quality Control...

2009-07-01

82

40 CFR 81.80 - Las Vegas Intrastate Air Quality Control Region.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Las Vegas Intrastate Air Quality Control Region. ...Quality Control Regions § 81.80 Las Vegas Intrastate Air Quality Control Region. The Las Vegas Intrastate Air Quality Control...

2013-07-01

83

Contribution of Proteases and LasR to the Virulence of Pseudomonas aeruginosa during Corneal Infections  

Microsoft Academic Search

The roles of the Pseudomonas aeruginosa proteases LasB (elastase) and LasA and the transcriptional activator LasR, which regulates the expression of these proteases, were evaluated in a murine model of P. aeruginosa corneal infection. In scarified corneas, P. aeruginosa PAO-A1 (LasA negative) or PAO-B1A1 (LasB and LasA negative) at a dose of 10 8 CFU per eye caused very mild

MICHAEL J. PRESTON; PATRICK C. SEED; DEBBIE S. TODER; BARBARA H. IGLEWSKI; DENNIS E. OHMAN; JEAN K. GUSTIN; JOANNA B. GOLDBERG; GERALD B. PIER

1997-01-01

84

Actitudes de los candidatos y maestros de ciencias en servicio acerca del uso de las herramientas computadorizadas en las clases de ciencias  

NASA Astrophysics Data System (ADS)

Este estudio examino y comparo las actitudes de los candidatos a maestros de ciencias y los maestros de ciencias en servicio acerca de la utilizacion de las herramientas computadorizadas en las clases de ciencias. Tambien identifico y diferencio el uso que ellos dan a estas herramientas en las clases de ciencias. Este estudio presenta un diseno descriptivo exploratorio. Constituyeron la muestra trescientos diez sujetos que fueron candidatos a maestros de ciencias o maestros de ciencias en servicio. Para recoger los datos se construyo y valido un cuestionario de treinta y un itemes. Se utilizaron las pruebas estadisticas no parametricas Kruskal Wallis y Chi-cuadrado (test de homogeneidad) para establecer las diferencias entre las actitudes de los sujetos con relacion al uso de las herramientas computadorizadas en las clases de ciencias. Los hallazgos evidenciaron que son positivas y muy parecidas las actitudes de los candidatos a maestros y maestros en servicio hacia el uso de las herramientas computadorizadas. No hubo diferencias entre los candidatos y maestros en servicio en terminos de las actitudes de confianza y empatia hacia el uso de las herramientas computadorizadas en las clases de ciencias. En aspectos como el uso del banco de datos bibliografico Eric y el uso de las herramientas computadorizadas en actividades educativas como explorar conceptos, conceptuar, aplicar lo aprendido y hacer asignaciones hubo diferencias estadisticamente significativas entre los candidatos y los maestros en servicio. Al comparar las frecuencias observadas con las esperadas hubo mas maestros en servicio y menos candidatos que indicaron usar el anterior banco de datos y las herramientas computadorizadas en las mencionadas actividades educativas.

Bayuelo, Ezequiel

85

Photocatalytic treatment of linear alkylbenzene sulfonate (LAS) in water.  

PubMed

The photocatalytic degradation of aqueous linear alkylbenzene sulfonate (LAS) was studied. Two different photocatalysts, Degussa P25 TiO2 and Hombikat UV 100 TiO2, were used to degrade aqueous linear alkylbenzene sulfonate in slurry batch photoreactors. For a 100 mg/L LAS solution based on first-order rate constants, the optimum photocatalyst loading for Degussa P25 TiO2 was 4.0 g/L, while for Hombikat UV 100 TiO2 it was 2.0 g/L. The photoactivity of Degussa P25 TiO2 it was higher than that of Hombikat UV 100 TiO2 for the treatment of LAS. A mixture of both photocatalysts did not improve the LAS degradation rates in batch experiments. Combination of Degussa P25 TiO2 and 600 mg/L H2O2 along with irradiation with UV light at either 254 or 365 nm did not improve the LAS degradation rates over the photocatalytic or photolytic processes individually. PMID:15887569

Mehrvar, Mehrab; Venhuis, Sarah Hatfield

2005-01-01

86

76 FR 37034 - Proposed Modification of the Las Vegas, NV, Class B Airspace Area; Public Meetings; Correction  

Federal Register 2010, 2011, 2012, 2013

...Procedures, and Bill Ruggiero, Support Manager Las Vegas, TRACON, 699 Wright Brothers Lane, Las Vegas, NV 89119; telephone...Procedures, and Bill Ruggiero, Support Manager Las Vegas, TRACON, 699 Wright Brothers Lane, Las Vegas, NV 89119;...

2011-06-24

87

Las Opciones Reales y su influencia en la valoración de empresas  

Microsoft Academic Search

Las opciones reales son derechos que las empresas poseen sobre determinados activos y que les permiten adaptarse al entorno con mayor flexibilidad y soportando menores riesgos. Desde la perspectiva de las opciones reales, el activo total de la empresa se compone de las inversiones ejecutadas y en funcionamiento y de sus oportunidades futuras de inversión. Por tanto, se considera que

Manuel Espitia Escuer; Gema Pastor Agustín

2003-01-01

88

Effects of linear alkylbenzene sulfonate (LAS) on the adsorption behaviour of phenanthrene on soils  

Microsoft Academic Search

Experimental measurements of adsorption of phenanthrene were made at 25°C with and without the presence of linear alkylbenzene sulfonate (LAS) on two soils from Shenyang, P. R. China and LUFA, Speyer, Germany. Effects of LAS on the adsorption of phenanthrene were studied in LAS concentration range around its critical micelle concentration (cmc) with emphasis on low LAS levels which are

Ziqing Ou; Ayfer Yediler; Yaowu He; Antonius Kettrup; Tieheng Sun

1995-01-01

89

Anaerobic treatment of sludge: focusing on reduction of LAS concentration in sludge  

Microsoft Academic Search

Anaerobic degradation of linear alkylbenzene sulfonates (LAS) was tested in continuous stirred tank reactors (CSTR). LAS12 was used as a model compound and was spiked on sewage sludge. The experiments clearly showed that transformation of LAS12 occurred under anaerobic conditions. The degree of transformation varied between 14% and 25%. HPLC analysis showed that disappearance of LAS12 was followed by the

F. Haggensen; A. S. Mogensen; I. Angelidaki; B. K. Ahring

2002-01-01

90

VARIABLES SIGNIFICATIVAS EN LAS RELACIONES VIOLENTAS EN PAREJAS JÓVENES: UNA REVISIÓN  

Microsoft Academic Search

Resumen La violencia en las parejas jóvenes es un precursor de la violencia en las pare- jas adultas. En las parejas jóvenes la violencia suele ser psicológica, plantearse de forma sutil y ser menos grave que en las parejas en la vida adulta. Por lo que se refiere a los agresores, la violencia es más frecuente cuando hay ciertas variables

Itxaso González-Ortega; Enrique Echeburúa; Paz de Corral

2008-01-01

91

LAS ESTRUCTURAS SOCIALES DE LA ECONOMÍA: EN PIERRE BOURDIEU  

Microsoft Academic Search

Los últimos acontecimientos dentro y fuera de los Estados Unidos en materia económica llevan a re-pensar el rol que juegan tanto la propiedad inmobiliaria como la propiedad en general dentro de nuestras conceptualizaciones y sistema económico. En ese contexto, se inscribe el trabajo del sociólogo francés Pierre Bourdieu titulado Las Estructuras Sociales de la Economía. Originalmente, el autor comienza uno

Maximiliano E. Korstanje

2009-01-01

92

Las Máscaras Del Héroe: Radiografía De Un Anti-Héroe  

Microsoft Academic Search

Las máscaras del héroe depicts Spanish society from the Second Republic to the start of the Civil War, a period when Spain was torn by poverty and immorality. This intertextual historical novel portrays figures such as Pedro Luis de Gálvez, the last of the bohemians and a failed writer. We encounter Gálvez through the first-person narration of Navales, who hates

Emilio Ramón

2009-01-01

93

Linking Cooperation and Sustainable Development: The Las Nubes Coffee Partnership  

Microsoft Academic Search

York University, the Tropical Science Center (TSC), and COOPEAGRI, R.L. of Costa Rica and Timothy's World Coffee have formed a unique partnership to advance rural sustainable development in the Las Nubes region of southern Costa Rica. York's Faculty of Environmental Studies (FES) and TSC have promoted the creation of a biological corridor along the Río Peñas Blancas, between the montane

Howard E. Daugherty; Stefanie J. Hall; Paula Pelaez

94

Las Rocas Nos Cuentan (Rocks Tell Their Stories)  

ERIC Educational Resources Information Center

|Many Earth science lessons today still focus on memorizing the names of rocks and minerals. This led the author to develop a lesson that reveals the fascinating stories told by rocks through the study of their physical properties. He first designed the lesson for Puerto Rican teachers, hence its Spanish title: "Las Rocas Nos Cuentan Su Historia."…

Llerandi-Roman, Pablo A.

2012-01-01

95

Linear alkylbenzene sulfonates (LAS) in the terrestrial environment  

Microsoft Academic Search

The occurrence of linear alkylbenzene sulfonates (LAS) in a series of soil samples originating from the municipality of Roskilde has been studied. The study includes soil samples from eight different locations with different histories: a preserved natural area that has not been cultured for 50–100 years, a soil that has been ecologically cultured for 40 years, a soil sustainably manured

Lars Carlsen; Mai-Britt Metzon; Jeanette Kjelsmark

2002-01-01

96

Modeling Surfactant LAS Influenced PAHs Migration in Soil Column  

Microsoft Academic Search

The objective of the present work was to study the transport of Polycyclic Aromatic Hydrocarbons (PAHs) in artificially contaminated and oil field soil columns while Linear Alkylbenzene Sulfonate (LAS) was used as leaching solvent. Through soil column leaching experiments, the through curves (BTCs) of the tracer (Br?) and PAHs were obtained. The batch equilibrium experiments were conducted. The partition coefficients,

J. Chen; X. J. Wang; J. D. Hu; S. Tao

2006-01-01

97

Modeling of Nonpoint Source Pollution in the Las Vegas Valley  

Microsoft Academic Search

The point sources of pollution (including wastewater treatment plants) within urban areas are well known. However, the contribution of nonpoint source pollution to receiving waterbodies is not as well understood. In this study, the contributions of nonpoint source runoff is evaluated and compared to the loadings from the wastewater treatment facilities in the Las Vegas Valley of southern Nevada. The

M. Reginato; T. C. Piechota

2001-01-01

98

The petrology of the Las Canadas volcanoes, Tenerife, Canary islands  

Microsoft Academic Search

Tenerife is the largest of the seven Tertiary to Recent volcanic islands that make up the Canary Archipelago. The island is composed of volcanics belonging to the basanitetrachyte-phonolite assemblage that characterises many Atlantic islands. The most voluminous development of intermediate and salic volcanics has been in the centre of the island where the Las Canadas volcanoes arose upon a basement

William Ian Ridley

1970-01-01

99

Las Vegas Serves up Biodiesel for Local Schools  

SciTech Connect

This 2-page Clean Cities fact sheet describes the use of biodiesel as a fuel source in buses by the Clark County School District, located in Las Vegas, NV. It includes information on the history of the program, along with contact information for the local Clean Cities Coordinator and Clark County School District.

Not Available

2004-04-01

100

Geology of Las Vegas, Nevada, United States of America  

Microsoft Academic Search

Las Vegas is one of the fastest growing cities in the US. Its regional geologic setting is in the Basin and Range geomorphic province and in the Sevier orogenic belt. The city itself lies in a broad north-south valley formed by coalescing alluvial fans and lake beds which give rise to several soil and foundation problems. Although destructive earthquakes have

R. V. Wyman; M. Karakouzian; V. Bax-Valentine; L. Peterson; S. Palmer; D. B. Slemmons

1993-01-01

101

Mojave mirages: gender and performance in Las Vegas  

Microsoft Academic Search

The article explores the permeable boundaries between image, perception, experience, and realities through a series of personal observations on gender and performance in Las Vegas. The author'observations on this resort destination in the middle of the Mojave Desert are mingled with the narratives of women who came to the area during and after World War II. Lucrative jobs in wartime

Joanne L. Goodwin

2002-01-01

102

Source Water Assessment for the Las Vegas Valley Surface Waters  

Microsoft Academic Search

The 1996 amendment to the Safe Drinking Water Act of 1974 created the Source Water Assessment Program (SWAP) with an objective to evaluate potential sources of contamination to drinking water intakes. The development of a Source Water Assessment Plan for Las Vegas Valley surface water runoff into Lake Mead is important since it will guide future work on source water

S. P. Albuquerque; T. C. Piechota

2003-01-01

103

Une mesure de la discrimination dans l'écart de salaire entre hommes et femmes  

Microsoft Academic Search

[spa] Una medición de la discriminación en la diferencia de salario entre hombres y mujeres Las diferencias de salario entre hombres y mujeres se deben a multiples factores. Primero, los empleos ocupados no tienen las mismas caracterlsticas: las duraciones medias de trabajo de las mujeres son más cortas, esencialmente a causa del tiempo parcial (que afecta a un tercio de

Dominique Meurs; Sophie Ponthieux

2000-01-01

104

Una mímesis del tiempo: Fray Bartolomé de Las Casas y las formas de una gramática del relato  

Microsoft Academic Search

History of the Indies, by Friar Bartolomé de Las Casas, was written over a thirty-year span, and is a text willing to include everything that happened in that timeframe. The History is also a text interrupted by constant digressions that show a particular emplotment that operates by accumulation in order to reproduce in the reading time, the writing time. This

Mariana C. Zinni

2012-01-01

105

Geophysical Studies of the Las Vegas Urban Corridor  

NSDL National Science Digital Library

The Geophysical Studies of the Las Vegas Urban Corridor Area are part of an integrated effort to "geologically characterize the seismic hazards, water resources, and crustal structure of this rapidly growing urban corridor" by the USGS. The informational Web site contains a gravity map of the Las Vegas region, an aeromagnetic map, and a publications link with a list of over a dozen references. Seven of these publications are freely available for download with titles such as "Aeromagnetic Survey of the Amargosa Desert," "Nevada and California: A Tool for Understanding Near-Surface Geology," and Hydrology and Principal Facts for Gravity Stations in the Vicinity of Coyote Spring Valley, Nevada, with Initial Gravity Modeling Results." An interesting collection of unique resources, the site should be of interest to professionals in a wide variety of fields.

2001-01-01

106

Near-Ground optical turbulence measurements at Cerro Las Campanas  

NASA Astrophysics Data System (ADS)

We report preliminary results from Near-Ground optical turbulence measurements carried out at Cerro Las Campanas, the future site of the Giant Magellan Telescope (GMT), using MooSci (Moon Scintillomenter), DIMM (Differential Image Motion Monitor) and MASS (Multiple Aperture Scintillation Sensor), focusing on the effects above the future GMT enclosure. This campaign will continue with future observations of the NGL turbulence in order to better model the adaptive optics performance and aid in the design of the GMT AO instrumentation

Prieto, G.; Berdja, A.; Thomas-Osip, J. E.

2011-11-01

107

Solar hot water system installed at Las Vegas, Nevada  

NASA Astrophysics Data System (ADS)

A solar energy hot water system installed in a motor inn at Las Vegas, Nevada is described. The inn is a three story building with a flat roof for installation of the solar panels. The system consists of 1,200 square feet of liquid flat plate collectors, a 2,500 gallon insulated vertical steel storage tank, two heat exchangers, and pumps and controls. The system was designed to supply approximately 74 percent of the total hot water load.

1981-01-01

108

Geology of Las Vegas, Nevada, United States of America  

SciTech Connect

Las Vegas is one of the fastest growing cities in the US. Its regional geologic setting is in the Basin and Range geomorphic province and in the Sevier orogenic belt. The city itself lies in a broad north-south valley formed by coalescing alluvial fans and lake beds which give rise to several soil and foundation problems. Although destructive earthquakes have not occurred in the Las Vegas area in modern times, the record is very short. Major earthquakes could have taken place in the past when the area was unoccupied except for a few nomadic tribes. Studies are underway to better define the seismicity. Although the climate is hot and dry, flash flooding occurs frequently from late summer thunderstorms and torrential rains. The Regional Flood Control District is actively constructing retention basins and drainage improvements for diversion and protection from such floods. Water supply is a problem for the increasing population. The groundwater supply has long been overdrawn, and the allotment to Nevada under the Colorado River Compact will be completely utilized in the near future. Las Vegas has faced the problems of solid waste disposal, water treatment, rational water use, flooding and earthquakes - all of which are related to the unique geologic and geomorphic setting.

Wyman, R.V.; Karakouzian, M. (Univ. of Nevada, Las Vegas (United States)); Bax-Valentine, V. (Clark County Regional Flood Control District, Las Vegas, NV (United States)); Peterson, L.; Palmer, S. (Kleinfelder, Las Vegas, NV (United States)); Slemmons, D.B.

1993-03-01

109

GIS methodology for quantifying channel change in Las Vegas, Nevada  

USGS Publications Warehouse

This study applies spatial analyses to examine the consequences of accelerated urban expansion on a hydrologic system over a period of 24 years. Three sets of historical aerial photos are used in a GIS analysis to document the geomorphic history of Las Vegas Wash, which drains the rapidly growing Las Vegas urban area in southern Nevada. New spatial techniques are introduced to make quantitative measurements of the erosion at three specific time intervals in the hydrologic evolution of the channel and floodplain. Unlike other erosion studies that use two different elevation surfaces to assess erosion, this study used a single elevation surface to remove systematic and nonsystemic elevation errors. The spatial analysis quantifies channel changes for discrete time periods, calculates erosion volumes, and provides a foundation to examine how the specific mechanisms related to urban expansion have affected Las Vegas Wash. The erosion calculated over 24 years is the largest documented sediment loss attributed to the effect of rapid urban growth. ?? 2007 American Water Resources Association.

Buckingham, S. E.; Whitney, J. W.

2007-01-01

110

Source Water Assessment for the Las Vegas Valley Surface Waters  

NASA Astrophysics Data System (ADS)

The 1996 amendment to the Safe Drinking Water Act of 1974 created the Source Water Assessment Program (SWAP) with an objective to evaluate potential sources of contamination to drinking water intakes. The development of a Source Water Assessment Plan for Las Vegas Valley surface water runoff into Lake Mead is important since it will guide future work on source water protection of the main source of water. The first step was the identification of the watershed boundary and source water protection area. Two protection zones were delineated. Zone A extends 500 ft around water bodies, and Zone B extends 3000 ft from the boundaries of Zone A. These Zones extend upstream to the limits of dry weather flows in the storm channels within the Las Vegas Valley. After the protection areas were identified, the potential sources of contamination in the protection area were inventoried. Field work was conducted to identify possible sources of contamination. A GIS coverage obtained from local data sources was used to identify the septic tank locations. Finally, the National Pollutant Discharge Elimination System (NPDES) Permits were obtained from the State of Nevada, and included in the inventory. After the inventory was completed, a level of risk was assigned to each potential contaminating activity (PCA). The contaminants of concern were grouped into five categories: volatile organic compounds (VOCs), synthetic organic compounds (SOCs), inorganic compounds (IOCs), microbiological, and radionuclides. The vulnerability of the water intake to each of the PCAs was assigned based on these five categories, and also on three other factors: the physical barrier effectiveness, the risk potential, and the time of travel. The vulnerability analysis shows that the PCAs with the highest vulnerability rating include septic systems, golf courses/parks, storm channels, gas stations, auto repair shops, construction, and the wastewater treatment plant discharges. Based on the current water quality data (prior to treatment), the proximity of Las Vegas Wash to the intake, and the results of the vulnerability analysis of potential contaminating activities, it is determined that the drinking water intake is at a Moderate level of risk for VOC, SOC, and microbiological contaminants. The drinking water intake is at a High level of risk for IOC contaminants. Vulnerability to radiological contamination is Moderate. Source water protection in the Las Vegas Valley is strongly encouraged because of the documented influence of the Las Vegas Wash on the quality of the water at the intake.

Albuquerque, S. P.; Piechota, T. C.

2003-12-01

111

76 FR 35371 - Proposed Modification of the Las Vegas, NV, Class B Airspace Area; Public Meetings  

Federal Register 2010, 2011, 2012, 2013

...FURTHER INFORMATION CONTACT: John Gough, Manager, Airspace and Procedures, and Bill Ruggiero, Support Manager Las Vegas, TRACON, 699 Wright Brothers Lane, Las Vegas, NV 89119; telephone: (702) 597-5910. SUPPLEMENTARY INFORMATION: [[Page...

2011-06-17

112

Biotransformation of linear alkylbenzene sulfonate (LAS) by Phanerochaete chrysosporium : oxidation of alkyl side-chain  

Microsoft Academic Search

The white rot fungus Phanerochaete chrysosporium, which generally mineralizes substituted aromatics to CO2, transformed linear alkylbenzene sulfonate (LAS) surfactants mainly at their alkyl side chain. Degradation of LAS was evidenced by a zone of clearing on LAS-containing agar plates and colorimetric analysis of liquid cultures. Disappearance of LAS was virtually complete within 10 days in low nitrogen (2.4 mM N),

Jagjit S. Yadav; David L. Lawrence; Barbara A. Nuck; Thomas W. Federle; C. Adinarayana Reddy

2001-01-01

113

Linear alkyl benzene sulphonate (LAS) degradation by immobilized Pseudomonas aeruginosa under low intensity ultrasound  

Microsoft Academic Search

We studied the LAS degradation of immobilized Pseudomonas aeruginosa with low-intensity ultrasonic and the influence of original LAS concentration, pH, rotary velocity and different conditions of low-intensity ultrasonic irradiation on the degradation of LAS. In our experiment, the degradation rate of LAS was the main index. We found that low-intensity ultrasonic irradiation could improve the metabolism of microorganism cells and

Xiang Lijun; Wang Bochu; Li Zhimin; Duan Chuanren; Wang Qinghong; Liu Liu

2005-01-01

114

Percepción de las redes sociales en la escuela: colegio Felipe Palazon (Tarija – Bolivia)  

Microsoft Academic Search

No hay duda que desde hace mucho las tecnologías de la información y comunicación, asi como internet, tienen un crecimiento exponencial sin límites en todo el mundo, por las múltiples aplicaciones, y aporte en todos los ámbitos profesionales, lo mismo ocurre con el fenómeno de las redes sociales. En Bolivia y, específicamente en la ciudad de Tarija, siguen esta tendencia;

Carmelo Branimir España Villegas

2011-01-01

115

78 FR 20354 - Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting, New Mexico  

Federal Register 2010, 2011, 2012, 2013

...DF0000] Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting...Bureau of Land Management's (BLM) Las Cruces District Resource Advisory Council (RAC...meet on April 23, 2013, at the BLM Las Cruces District Office Main Conference Room...

2013-04-04

116

77 FR 18858 - Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting, New Mexico  

Federal Register 2010, 2011, 2012, 2013

...DF0000] Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting...Bureau of Land Management (BLM), Las Cruces District Resource Advisory Council (RAC...date is April 11 2012, at the BLM Las Cruces District Office, 1800 Marquess...

2012-03-28

117

77 FR 77090 - Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting, New Mexico  

Federal Register 2010, 2011, 2012, 2013

...DF0000] Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting...Bureau of Land Management's (BLM) Las Cruces District Resource Advisory Council (RAC...Museum, 4100 Dripping Springs Road, Las Cruces, NM, 88005 from 9 a.m.-4...

2012-12-31

118

78 FR 44590 - Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting, New Mexico  

Federal Register 2010, 2011, 2012, 2013

...DF0000] Notice of Public Meeting, Las Cruces District Resource Advisory Council Meeting...Bureau of Land Management's (BLM) Las Cruces District Resource Advisory Council (RAC...meet on August 22, 2013, at the BLM Las Cruces District Office Main Conference Room...

2013-07-24

119

LOS HÁBITOS DE ACTIVIDAD FÍSICA DE LAS PERSONAS MAYORES EN ESPAÑA Y CONDICIÓN SOCIAL  

Microsoft Academic Search

La investigación persigue comprobar las posibles desigualdades y diferencias según la posición social percibida en la práctica de actividad física semanal regular (una o dos veces por semana) de las personas mayores en España. La metodología cuantitativa empleada ha consistido en la aplicación de un cuestionario estructurado a una mues- tra aleatoria de las personas mayores de 65 años en

González Rivera; Martín Rodríguez; Jiménez-Beatty Navarro; Campos Izquierdo

120

Anaerobic biodegradation of linear alkylbenzene sulfonate (LAS) in upflow anaerobic sludge blanket (UASB) reactors  

Microsoft Academic Search

The anaerobic biodegradation of Linear Alkylbenzene Sulfonate (LAS) was studied in Upflow Anaerobic Sludge Blanket Reactors (UASB). One reactor was fed with easily degradable substrates and commercial LAS solution during a period of 3 months (Reactor 1), meanwhile a second reactor was fed with a commercial LAS solution without co-substrate (Reactor 2) during 4 months. Both reactors were operated with

José L. Sanz; Elayne Culubret; Juan de Ferrer; Alfonso Moreno; José L. Berna

2003-01-01

121

78 FR 2646 - Proposed Modification of Class B Airspace; Las Vegas, NV  

Federal Register 2010, 2011, 2012, 2013

...Modification of Class B Airspace; Las Vegas, NV AGENCY: Federal Aviation Administration...document, the FAA proposed to modify the Las Vegas, NV, Class B airspace area to ensure...Modification of Class B Airspace; Las Vegas, NV'' (77 FR 65332). The FAA...

2013-01-14

122

75 FR 38778 - Expansion of Foreign-Trade Zone 89 Las Vegas, NV  

Federal Register 2010, 2011, 2012, 2013

...1688] Expansion of Foreign-Trade Zone 89 Las Vegas, NV Pursuant to its authority under the Foreign-Trade...FTZ 89 to include a site in the City of North Las Vegas, Nevada, within the Las Vegas Customs and Border Protection port of entry...

2010-07-06

123

Las Relaciones Universidad- Empresa y su incidencia en la Producción Científica  

Microsoft Academic Search

El establecimiento de forma generalizada de las relaciones entre la Universidad y la empresa ha abierto un campo de estudio de gran interés, centrado en los efectos que tales relaciones pudiesen tener sobre las misiones universitarias tradicionales, especialmente sobre la investigación. En este artículo se analiza si las relaciones universidad empresa (RUE) inhiben la productividad científica de los profesores universitarios.

Liney Manjarrés-Henríquez; Antonio Gutiérrez-Gracia; Jaider Vega-Jurado; Andrés Carrión-García

2012-01-01

124

UNA METODOLOGÍA ADMINISTRATIVA PARA LAS PEQUEÑAS Y MEDIANAS EMPRESAS DE LA REGIÓN DE CELAYA  

Microsoft Academic Search

En los últimos años en nuestro país, ha venido cobrando especial relevancia el sector de los micros, pequeñas y medianas empresas (MIPyMES); las estrategias principales del gobierno, están enfocadas precisamente en el apoyo a este sector, que sustenta las cifras actuales de empleo. Sin embargo las condiciones económicas y financieras del entorno han generado un alto grado de incertidumbre, los

Nicolás Barajas-Andrade; Eugenio Guzmán-Soria; Juvencio Hernández-Martínez; Samuel Rebollar-Rebollar

2009-01-01

125

Determinantes de las respuestas a vacunas orales en países en vías de desarrollo  

Microsoft Academic Search

ExtractoLas vacunas orales que se han diseñado para uso global no inducen necesariamente las mismas respuestas inmunitarias en todos los niños de todo el mundo. De hecho, varias vacunas inducen a menudo respuestas medias de anticuerpos menos frecuentes y menores en niños en países en vías de desarrollo, lo que permite suponer que las vacunas pueden producir un efecto menos

David A. Sack; Firdausi Qadri; Ann-Mari Svennerholm

2008-01-01

126

Influence of water hardness on the bioavailability and toxicity of linear alkylbenzene sulphonate (LAS)  

Microsoft Academic Search

In the present work, the influence of Ca2+ concentration on the toxicity of single cut linear alkylbenzene sulfonate (LAS) homologues was studied. Precipitation boundary diagrams for each homologue were obtained, indicating turbid and clear zones depending on the LAS and Ca2+ concentrations. The separation between transparent and turbid zones is given by the so-called precipitation line. LAS toxicity to Daphnia

Coral Verge; Alfonso Moreno; José Bravo; José L. Berna

2001-01-01

127

VIOLENCIA CONTRA MUJERES: REFLEXIONES TEÓRICAS  

Microsoft Academic Search

Violence appears in different forms and circumstances and involves distinct kinds of violent acts against children, women, elderly and other defenseless persons. This serious problem, which degrades women's integrity, is denoted by terms like domestic violence, gender violence and violence against women. Gender violence can appear as physical, psychological, sexual, economic violence, as well as violence at work. Violence against

Leticia Casique Casique

128

Mecanismos de Acción de las Auxinas y los Herbicidas Auxínicos  

NSDL National Science Digital Library

Se muestra como las auxinas y los herbicidas auxínicos pueden inducir respuestas celulares y se describe el transporte basípeto de las auxinas. También se muestra como los receptores de auxinas reconocen las auxinas y los herbicidas auxínicos, los cuales inducen entonces la transmisión y traducción de señales para activar varios genes; el papel de los productos de esos genes en las respuestas de las plantas es también mostrado.

129

ÓPTIMO DE COBERTURA VEGETAL EN RELACIÓN A LAS PÉRDIDAS DE SUELO POR EROSIÓN HÍDRICA Y LAS PÉRDIDAS DE LLUVIA POR INTERCEPTACIÓN  

Microsoft Academic Search

RESUMEN Se establece, en una primera aproximación, el óptimo de cobertura en función de las pér- didas de suelo por erosión hídrica y de las pérdidas de lluvia por interceptación, en un mato- rral (romeral), en condiciones ambientales semiáridas mediterráneas, con un mismo tipo de suelo y dos tramos de pendiente de ladera, 11% y 25%. Se utiliza el promedio

Belmonte Serrato; Romero Díaz; López Bermúdez; E. Hernández Laguna

130

Revision curricular a partir de un analisis comparativo de las discrepancias en los curriculos de una escuela de optometria en Puerto Rico con las competencias requeridas para las agencias de revalida y acreditacion 2004  

NASA Astrophysics Data System (ADS)

El proposito de esta investigacion, un estudio cualitativo de caso, fue comparar y contrastar el curriculo vigente de la Escuela de Optometria de la UIAPR con las competencias y estandares requeridos por las agencias de acreditacion y de revalida. Con este proposito, decidimos realizar una revision y un analisis de documentos: el prontuario de cada uno de los cursos de los curriculos implantados en el 1993 y en el 2001; las competencias y estandares establecidos por las agencias de revalida y de acreditacion; y las estadisticas en las que se analiza el porcentaje de estudiantes que aprueban cada una de las partes de los examenes de revalida entre el 1998 al 2003. Se realizaron entrevistas dirigidas para dar apoyo y complementar la revision y el analisis de estos documentos. Los participantes de las entrevistas fueron tres estudiantes de la clase de optometria del 2004 (ultima clase del curriculo del 1993); tres estudiantes de la clase de optometria del 2005 (primera clase graduanda del curriculo vigente) y tres profesores y/o directores de los Departamentos de Ciencias Basicas, Ciencias Clinicas y Cuidado al Paciente. Esta investigacion se enmarco en el modelo de evaluacion curricular de discrepancia de Malcolm Provus y en el modelo de desarrollo basado en competencias. Uno de los hallazgos mas importantes del estudio es que los cambios que se implantaron al curriculo del 2001 no han logrado que los estudiantes mejoren su ejecucion en los examenes de revalida. Por otro lado, se encontro que el curriculo vigente atiende completamente los estandares de la practica de Optometria, pero no las competencias. Esta informacion fue validada mediante el uso de una tabla de cotejo para el analisis de los cursos y de la informacion obtenida de las entrevistas. El estudio determina y concluye que existen discrepancias entre los prontuarios de los cursos del curriculo y las competencias requeridas por la agencia de revalida. Segundo, que el Departamento de Ciencias Basicas es el que presenta mas deficiencias en el desarrollo de las competencias. El investigador recomienda disenar e implantar un curriculo basado en competencias y proveer formacion en didactica y procesos de aprendizaje a los profesores.

Rivera Pacheco, Andres

131

Hotel room suicide: Las Vegas and Clark County.  

PubMed

Our objective is to study the link between hotel registration and suicide. Clark County, which contains Las Vegas, drew our interest because of its extremely large number of hotel rooms. Case files of suicide from the Clark County Coroner were reviewed for years 2003-2005. The suicide rate of local residents registering in local hotels was 271/100,000. This is greater than the suicide rate in the general population of Clark County, 16.6/100,000, P<0.0001, Poisson distribution. Hotel guests from outside Clark County had a reduced rate of suicide, 4.6/100,000, P<0.0001. Residents of Clark County registering in local hotels have an increased suicide risk that is statistically significant. Possible explanations for the results are provided. PMID:17934685

Gemar, Kjersti; Zarkowski, Paul; Avery, David

2007-10-12

132

Influencia de los bancos y cajas como accionistas y acreedores en la manipulación contable de las empresas  

Microsoft Academic Search

En este trabajo utilizamos una base de datos formada por 13247 empresas españolas para el periodo 1996-2000 y estudiamos el efecto de la presencia de instituciones financieras –bien sea como accionista o como acreedor- en las practicas de manipulación de beneficios (earnings management) de las empresas. Encontramos que las instituciones financieras como accionistas estimulan las prácticas de manipulación contable en

Jordi Surroca; Josep A. Tribo

2007-01-01

133

La externalizacion del trabajo agrario y las empresas de servicios a la agricultura  

Microsoft Academic Search

Resumen: En este art�culo se analiza el proceso de externalizaci�n de las labores agrarias y el consiguiente desarrollo de una agricultura terciarizada. La fragmentada dimensi�n laboral y econ�mica de las explotaciones agrarias determina el proceso de externalizaci�n de las tareas agrarias en la medida en que no permite ni la incorporaci�n de innovaciones que exige el desarrollo del sistema alimentario

Alicia Langreo Navarro; Sociedad de Estudios

2002-01-01

134

Analytical methodology for linear alkylbenzene sulfonate (LAS) in waters and wastes  

Microsoft Academic Search

Analytical methodology has been developed for the measurement of linear alkylbenzene sulfonate (LAS) in a broad spectrum of\\u000a water and wastewater samples. In addition to providing the homolog-isomer composition of LAS, the gas chromatographic procedure\\u000a has been quantified by incorporation of an internal standard to provide a specific measurement of LAS. The applicability and\\u000a sensitivity of the standard, but non-specific,

Q. W. Osburn

1986-01-01

135

Inhibition of Biogas Production by Alkyl Benzene Sulfonates (LAS) in a Screening Test for Anaerobic Biodegradability  

Microsoft Academic Search

The effect of the inoculum source on the digestion of linear alkylbenzene sulfonates (LAS) under anaerobic conditions has\\u000a been investigated. The potential for primary and ultimate LAS biodegradation of anaerobic sludge samples obtained from wastewater\\u000a treatment plants (WWTPs) of different geographical locations was studied applying a batch test system. It was found that only\\u000a 4–22% of the LAS added to

M. Teresa Garcia; Encarna Campos; Manel Dalmau; Patricia Illán; Joaquin Sánchez-Leal

2006-01-01

136

“Ripple effects” and forecasting home prices in Los Angeles, Las Vegas, and Phoenix  

Microsoft Academic Search

We examine the time-series relationship between house prices in Los Angeles, Las Vegas, and Phoenix. First, temporal Granger\\u000a causality tests reveal that Los Angeles house prices cause house prices in Las Vegas (directly) and Phoenix (indirectly).\\u000a In addition, Las Vegas house prices cause house prices in Phoenix. Los Angeles house prices prove exogenous in a temporal\\u000a sense and Phoenix house

Rangan Gupta; Stephen M. Miller

2009-01-01

137

Environmental levels of Linear alkylbenzene Sulfonates (LAS) in sediments from the Tagus estuary (Portugal): environmental implications.  

PubMed

Sediments from the Tagus estuary (Portugal) were collected at 40 stations in July and December 2004. Total LAS concentrations ranged between 0.03 and 17.76 mg LAS.kg(-1) dry weight in July, and between 0.09 and 9.57 mg LAS.kg(-1) in December. Highest LAS concentrations were found at the upper northern part of the estuary, coincident with the localisation of an important waste water treatment station. According to the Predicted No Effect Concentration (PNEC) of 8.1 mg.kg(-1) derived for this compound, Environmental Risk Assessment (ERA) identified a hazard for the ecosystem at the station with the highest LAS concentration, and similar results are obtained by Equilibrium Partitioning Method (EPM). Nevertheless, LAS concentrations decreased significantly between samplings in the stations with the highest LAS concentrations in July, whereas increased LAS concentrations at adjacent stations were found in December. In the remaining stations, LAS concentrations were up to three orders of magnitude lower, representing no hazard for the sediment community. PMID:18228153

Hampel, M; Canário, J; Branco, V; Vale, C; Blasco, J

2008-01-29

138

Atmospheric Radioxenon Measurements in North Las Vegas, NV  

SciTech Connect

PNNL deployed the ARSA radioxenon measurement system in North Las Vegas for two weeks in February and March 2006 for the purpose of measuring the radioxenon background at a level of sensitivity much higher than previously done in the vicinity of the NTS. The measurements establish what might be expected if future measurements are taken at NTS itself. The measurements are also relevant to test site readiness. A second detector, the PEMS, built and operated by DRI, was deployed in conjunction with the ARSA and contained a PIC, aerosol collection filters, and meteorological sensors. Originally, measurements were also to be performed at Mercury, NV on the NTS, but these were canceled due to initial equipment problems with the ARSA detector. Some of the radioxenon measurements detected 133Xe at levels up to 3 mBq/m3. This concentration of radioxenon is consistent with the observation of low levels of radioxenon emanating from distance nuclear reactors. Previous measurements in areas of high nuclear reactor concentration have shown similar results, but the western US, in general, does not have many nuclear reactors. Measurements of the wind direction indicate that the air carrying the radioxenon came from south of the detector and not from the NTS.

Milbrath, Brian D.; Cooper, Matthew W.; Lidey, Lance S.; Bowyer, Ted W.; Hayes, James C.; McIntyre, Justin I.; Karr, L.; Shafer, D.; Tappen, J.

2006-07-31

139

Optimization of linear alkylbenzene sulfonate (LAS) degradation in UASB reactors by varying bioavailability of LAS, hydraulic retention time and specific organic load rate.  

PubMed

Degradation of linear alkylbenzene sulfonate (LAS) in UASB reactors was optimized by varying the bioavailability of LAS based on the concentration of biomass in the system (1.3-16 g TS/L), the hydraulic retention time (HRT), which was operated at 6, 35 or 80 h, and the concentration of co-substrates as specific organic loading rates (SOLR) ranging from 0.03-0.18 g COD/g TVS.d. The highest degradation rate of LAS (76%) was related to the lowest SOLR (0.03 g COD/g TVS.d). Variation of the HRT between 6 and 80 h resulted in degradation rates of LAS ranging from 18% to 55%. Variation in the bioavailability of LAS resulted in discrete changes in the degradation rates (ranging from 37-53%). According to the DGGE profiles, the archaeal communities exhibited greater changes than the bacterial communities, especially in biomass samples that were obtained from the phase separator. The parameters that exhibited more influence on LAS degradation were the SOLR followed by the HRT. PMID:23196232

Okada, Dagoberto Y; Delforno, Tiago P; Esteves, Andressa S; Sakamoto, Isabel K; Duarte, Iolanda C S; Varesche, Maria B A

2012-10-26

140

Comprehensive Housing Market Analysis: Las Vegas-Paradise, Nevada As of March 1, 2009.  

National Technical Information Service (NTIS)

The Las Vegas-Paradise, Nevada Housing Market Area (HMA) consists of Clark County, which is located in southern Nevada, bordering California. Las Vegas, the most populous city in the county and the county seat, is known as the Entertainment Capital of the...

2009-01-01

141

IUS Y LEX: NOTAS METODOLÓGICAS SOBRE LAS CLASIFICACIONES TAXONÓMICAS EN MARY DOUGLAS  

Microsoft Academic Search

Para Douglas las percepciones y las anomalías se relacionan no con la naturaleza en sí sino con un sistema de clasificación previo. La idiosincrasia cultural clasifica a su manera que elementos encajan en tal y\\/o cual lugar. Douglas está interesada en estudiar el rol de la metáfora y la anomalía como modos comparativos entre el orden cultural y natural. Al

Maximiliano Korstanje

2007-01-01

142

Las Células Dendríticas y su Papel de Centinelas del Sistema Inmune  

Microsoft Academic Search

La historia natural de estas células se divide en dos: células inmaduras y células maduras. Las CDe inmadu- ras se encuentran distribuidas ampliamente en tejidos linfoides y no linfoides y con una tasa de recambio rela- tivamente rápida (vida media menos de dos días). Esta alta tasa de recambio está asociada a una de las carac- terísticas particulares de esta

Melitza Iglesias

143

Linear Alkylbenzene Sulfonates (LAS) in Sewage Sludges, Soils and Sediments: Analytical Determination and Environmental Safety Considerations  

Microsoft Academic Search

Linear Alkylbenzenesulphonates (LAS), a major anionic surfactant used in laundry products, can be measured specifically in the environment by instrumental analysis. In addition to a desulphonation-gas chromatography approach, a method based on high performance liquid chromatography has been developed. The main features of the methods are outlined, and LAS concentrations measured in sewage sludge, sediments and sludge amended soils are

H. De Henau; E. Mathijs; W. D. Hopping

1986-01-01

144

Anaerobic bioprocessing of sewage sludge, focusing on degradation of linear alkylbenzene sulfonates (LAS)  

Microsoft Academic Search

Anaerobic degradation of sludge amended with linear alkylbenzene sulfonates (LAS) was tested in a one stage continuous stirred tank reactor (CSTR) and a two stage reactor system consisting of a CSTR as first step and upflow anaerobic sludge bed (UASB) reactor as the second step. Anaerobic removal of LAS was only observed at the second step but not at the

I. Angelidaki; L. Toräng; C. M. Waul; J. E. Schmidt

145

LAS homolog distribution shift during wastewater treatment and composting ecological implications  

Microsoft Academic Search

The behavior of LAS (linear alkylbenzene sulfonate) in different environmental compartments was studied through wastewater treatment process steps in sewage treatment plants of Alicante and Benidorm (activated sludge type) as well as in Guardamar (lagoons). The fate of LAS, using a specific HPLC method, was monitored during treatment sludge compostage and soil amendment operations. Finally, the marine sediments close to

D. Prats; F. Ruiz; B. Vazquez; D. Zarzo; J. L. Berna; A. Moreno

1993-01-01

146

La Noche de las Brujas Module. Nivel Primario. [The Night of the Witches Module. Primary Level.  

ERIC Educational Resources Information Center

|La Noche de las Brujas (Halloween) is the topic of this primary level unit. The objectives are to enable the child to: (1) draw scenery, using his imagination, about witches, castles, and devils; (2) write compositions on witches, devils, and Halloween; (3) explain the story "La Noche de las Brujas"; (4) tell about any adventures or incidents he…

Espinoza, Delia

147

EFFECT OF SECONDARY EFFLUENTS ON EUTROPHICATION IN LAS VEGAS BAY, LAKE MEAD, NEVADA  

EPA Science Inventory

The eutrophication potential of Lake Mead, with primary emphasis on Las Vegas Bay, was determined with Selenastrum capricornutum. Nutrient limitation profiles were determined for three sampling stations in Las Vegas Bay and one in Boulder Basin. After heavy metals were chelated w...

148

Geology of the Gualan and Southern Sierra de las Minas Quadrangles, Guatemala  

Microsoft Academic Search

The Gualan and Sierra de las Minas quadrangles straddle the Motagua Valley fault zone, a major southerly convex fault zone of Nuclear Central America, and the active transform boundary between the North American and Caribbean plates. Two distinctly different pre-Mesozoic metamorphic basement complexes are exposed in the area. The Chuacus Group crops out north of the Motagua Valley. The Las

K. R. Johnson

1984-01-01

149

Problem-Solving in Las Vegas: Students Are Building Skills and a Global Network.  

ERIC Educational Resources Information Center

Describes a project initiated at Silverado High School in Las Vegas, where students from Las Vegas and schools across the United States monitor the levels of radon in the atmosphere. Enables students to learn first hand about the collection, analysis, and interpretation of scientific data and to network with other students from the United States…

Budd, Gregory; Curry, Don

1995-01-01

150

La gestión de las relaciones con clientes y la empresa de alta rentabilidad de Galicia  

Microsoft Academic Search

RESUMEN La gestión de las relaciones con los clientes es un factor diferencial de las empresas de alta rentabilidad (AR), organizaciones que poseen un elevado rendimiento económico. El presente trabajo propone profundizar en la gestión de clientes como fuente de ventaja competitiva, aplicando la perspectiva de los recursos y capacidades. Con esta finalidad, ofrecemos los resultados obtenidos tras la realización

Pablo Cabanelas Lorenzo; Anxo Moreira

2009-01-01

151

El fenotipo de las mucinas en el es?fago de Barrett  

PubMed Central

Antecedentes El esófago de Barrett es una reconocida lesión precursora de adenocarcinoma esofágico. Aunque generalmente asociada al reflujo gastroesofágico, los mecanismos patogénicos de la enfermedad no son bien conocidos. El objetivo del presente estudio es explorar la historia natural e identificar marcadores de progreso del proceso precanceroso. Material y métodos Se utilizaron cortes histológicos de 67 especímenes de esófago correspondientes a 14 pacientes con esófago de Barrett, a los que se siguió entre 1 – 9 años. Se clasificaron las lesiones en: esófago de Barrett sin displasia, indefinido para displasia o con displasia. Se evaluó la expresión de diferentes mucinas en las células caliciformes y en las columnares usando técnicas de histoquímica e inmunohistoquímica. Resultados En todos los casos se comprobó la presencia de metaplasia intestinal incompleta. Las células columnares dentro del epitelio metaplásico contenían mucinas neutras. A mayor severidad de la lesión se encontró significativamente menor expresión de sialomucinas en las células columnares (p de tendencia igual a 0,03). En sujetos con lesiones indefinidas para displasia se observó un mayor contenido de sulfomucinas en las células caliciformes (p=0,034) y de MUC2 en las células columnares (p=0,029) que en sujetos con esófago de Barrett sin displasia. Se observó expresión de la mucina intestinal MUC2 y de la mucina gástrica MUC5AC en todas las muestras. MUC6, una mucina de las glándulas profundas gástricas, se presentó ocasionalmente. Conclusión La evaluación de los perfiles de mucinas en el esófago de Barrett sugiere una transición gradual del fenotipo del epitelio metaplásico a medida que la lesión avanza en el tiempo.

Torrado, Julio; Piazuelo, Maria Blanca; Ruiz, Irune; Izarzugaza, Maria Isabel; Camargo, Maria Constanza; Delgado, Alberto; Abdirad, Afshin; Correa, Pelayo

2011-01-01

152

Roles of Pseudomonas aeruginosa las and rhl Quorum-Sensing Systems in Control of Elastase and Rhamnolipid Biosynthesis Genes  

Microsoft Academic Search

putative interaction between PAI-2 and RhlR, we demonstrated that (3H)PAI-2 binds to E. coli cells expressing RhlR and not to those expressing LasR. Finally, the specificity of the las and rhl systems was examined in E. coli bioassays. The las system was capable of mildly activating rhlA, and similarly, the rhl system partly activated lasB. However, these effects were much

JAMES P. PEARSON; EVERETT C. PESCI; BARBARA H. IGLEWSKI

1997-01-01

153

LAS AMERICAS Y LA CIVILIZACIÓN: PROCESO DE FORMACIÓN Y CAUSAS DEL DESARROLLO DESIGUAL DE LOS PUEBLOS AMERICANOS  

Microsoft Academic Search

Indudablemente Darcy Ribeiro se ha transformado en uno de los antropólogos latinoamericanos más influyentes de las últimas décadas. Centrado en el estudio de las causas económicas y políticas del desarrollo. En este contexto, la presente reseña examina su trabajo: Las Américas y la Civilización, obra publicada originalmente en 1972 por el Centro Editor de América Latina. El capítulo introductorio comienza

Maximiliano E. Korstanje

2009-01-01

154

40 CFR 81.82 - El Paso-Las Cruces-Alamogordo Interstate Air Quality Control Region.  

Code of Federal Regulations, 2010 CFR

...2009-07-01 false El Paso-Las Cruces-Alamogordo Interstate Air Quality...Regions § 81.82 El Paso-Las Cruces-Alamogordo Interstate Air Quality Control Region. The El Paso-Las Cruces-Alamogordo Interstate...

2009-07-01

155

40 CFR 81.82 - El Paso-Las Cruces-Alamogordo Interstate Air Quality Control Region.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false El Paso-Las Cruces-Alamogordo Interstate Air Quality...Regions § 81.82 El Paso-Las Cruces-Alamogordo Interstate Air Quality Control Region. The El Paso-Las Cruces-Alamogordo Interstate...

2010-07-01

156

The Las Cañadas caldera (Tenerife, Canary Islands): an overlapping collapse caldera generated by magma-chamber migration  

Microsoft Academic Search

The Las Cañadas caldera is one of the most important geological structures of Tenerife. Stratigraphic, structural, volcanological, petrological, geochronological, and geophysical data suggest that the Las Cañadas caldera resulted from multiple vertical collapse episodes that occurred during the construction of the Las Cañadas edifice Upper Group. Three long-term (?200ka) cycles of phonolitic explosive activity, each culminating with a caldera collapse,

J. Marti; A. Gudmundsson

2000-01-01

157

La internacionalización de empresas: relación entre el capital social, las tecnologías de la información relacional y la innovación  

Microsoft Academic Search

Este trabajo tiene como objetivo revisar el proceso de internacionalización de las empresas, estudiando su desempeño exportador y la influencia que ejercen variables como el capital social, las tecnologías de la información relacional (Web 2.0) y la innovación. Para cumplir este propósito se realiza una revisión sobre los fundamentos teóricos y conceptuales sobre la relación entre la internacionalización empresarial, las

María José Peláez Cano; Manuel Rodenes Adam

2010-01-01

158

Routine Diagnostic Venous Ultrasound and LAS for Leg Edema of Unknown Cause  

PubMed Central

Objective: To verify the diagnostic efficiency of venous duplex ultrasound and lymphangioscintigraphy (LAS) in establishing the cause of leg edema and to clarify the pathology of these leg edemas. Materials and Methods: Between April 2009, and March 2010, 62 patients with leg edema of unknown origin were referred to the Edema Clinic of the Yamaguchi University Graduate School of Medicine. All patients underwent a venous duplex ultrasound scan and LAS. Results: Of 62 patients, lymphatic insufficiency, venous insufficiency or both was diagnosed in 42 (68%), and lymphedema, in 29 (47%). Venous duplex ultrasound detected obvious venous disorders in only 13 (21%), and for 20 patients, the ultrasound and LAS did not reveal any abnormalities; however, for 15 of the 20 (24% of all patients), venous edema was attributed to functional causes. Conclusion: Venous duplex ultrasound and LAS assisted in the diagnosis of leg edema of unknown origin and also proved useful in establishing treatment strategies.

2010-01-01

159

Estimación de la Validez de Constructo y Consistencia Interna de la Escala de Impacto de las Imágenes Femeninas Presentadas por los Medios de Comunicación sobre Adolescentes Mujeres. * Construct Validity and Reliability of an Instrument to Assess the Impact of Female Images Presented by the Mass Media on Female Adolescents  

Microsoft Academic Search

This paper aimed to estimate reliability and construct validity of an instrument to assess the impact of female images presented by the mass media on body image of female adolescents (IMAMIF) of Larraín, Camus, Orellana and Arrieta, in a sample of 662 female adolescents. It is a questionnaire of 45 statements that evaluates the impact that female images presented by

M. Elena; Larraín Sundt

160

La Interacción de la Luz con las Biomoléculas  

NSDL National Science Digital Library

En esta lección se describe la naturaleza de la luz, la energía de los fotones y como dicha energía puede ser transferida a las biomoléculas. Se describen también tanto los procesos benéficos como los procesos dañinos por medio de los cuales las biomoléculas disipan la energía recibida.

161

Effect of linear alkylbenzene sulfonate (LAS) and atrazine on marine microalgae  

Microsoft Academic Search

Five marine microalgae (Tetraselmis chuii, Rhodomonas salina, Chaetoceros sp., Isochrysis galbana (T-iso) and Nannochloropsis gaditana), in the same biovolume quantity, were exposed to 72h growth-inhibition tests with atrazine and LAS. In all cases, the inhibition effect of atrazine was higher than that of LAS up to two orders of magnitude higher in the case of T. chuii. In a second

B. Debelius; J. M. Forja; A. Del Valls; L. M. Lubián

2008-01-01

162

The “Truth” Behind a Scandal: Jorge Ibargüengoitia’s Las muertas  

Microsoft Academic Search

Social criticism is central to Jorge Ibargüengoitia’s Las muertas (1977). However, it is often overlooked that Ibargüengoitia’s novel can also be considered to be a parody of creative nonfiction,\\u000a particularly of New Journalism. In Las muertas, Ibargüengoitia gives a humorous account of the infamous Poquianchis case (1963–1964) by drawing on the extensive press coverage\\u000a which the case elicited. \\u0009Ibargüengoitia’s borrowing

Charlotte Lange

2009-01-01

163

Stress Protein Responses in South African Freshwater Invertebrates Exposed to Detergent Surfactant Linear Alkylbenzene Sulfonate (LAS)  

Microsoft Academic Search

Stress responses can be measured at various levels of biological organization, from sub-organism through to ecosystem level.\\u000a This study aimed to investigate stress protein induction as a sub-organism level stress response in two South African freshwater\\u000a aquatic macroinvertebrates exposed to detergent linear alkylbenzene sulfonate (LAS). Shrimp Caridina nilotica and limpet Burnupia stenochorias were exposed to a range of LAS concentrations

Andrew K. Gordon; Gregory L. Blatch; Sheril Daniel; Wilhelmine J. Muller

2008-01-01

164

ANÁLISIS DE LAS COMUNIDADES CIENTÍFICAS Y ACADÉMICAS DE LAS CIENCIAS BÁSICAS MÉDICAS Y DE LA SALUD PÚBLICA EN COLOMBIA ¿UNA DIFERENCIA?  

Microsoft Academic Search

El objetivo de este trabajo es caracterizar la dinámica de los recursos humanos en investigación y su producción científica al interior de las comunidades de salud pública y ciencias básicas biomédicas del país. El enfoque de este estudio articula la evaluación del comportamiento de los recursos humanos y el tránsito hacia comunidades científicas, vistos desde la teoría del capital conocimiento

Hernán Jaramillo Salazar; Carolina Lopera Oquendo

2008-01-01

165

Effect of the test media and toxicity of LAS on the growth of Isochrysis galbana.  

PubMed

In this paper, the toxicity of linear alkylbenzene sulfonate (LAS) was evaluated in the marine microalga Isochrysis galbana using data of growth inhibition toxicity tests at 96-h exposure time. Toxicity was examined in standard conditions and by means of the modification of two variables of the test media: (1) the dilution water and (2) the content of nutrients in the test medium. For this purpose, a total of 10 toxicity test were designed: five dilution waters, four natural marine waters and one synthetic seawater; each in two different nutritive conditions, saturated nutrient concentration (SC) by the addition of modified f/2 nutritive medium, and natural nutrient concentration (NC), i.e., without the addition of f/2. At threshold toxicity levels, the dilution waters used in the test and the nutrient concentrations did not affect the toxicity of LAS. At IC50 concentrations, the toxicity of LAS is influenced by both variables: under SC conditions, the toxic effect of LAS diminishes, obtaining in all the tests IC50 > 10 mg/L LAS. Under NC conditions, IC50 concentrations ranging between 3.15 and 9.26 mg/L LAS have been obtained. PMID:18473164

Garrido-Perez, M C; Perales-VargasMachuca, J A; Nebot-Sanz, E; Sales-Márquez, D

2008-05-13

166

40 CFR 51.917 - What is the effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area?  

Code of Federal Regulations, 2010 CFR

...effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area...effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area? The Las Vegas, NV, 8-hour ozone nonattainment...

2010-07-01

167

40 CFR 51.917 - What is the effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area?  

Code of Federal Regulations, 2010 CFR

...effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area...effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area? The Las Vegas, NV, 8-hour ozone nonattainment...

2009-07-01

168

Gripe y otras infecciones respiratorias agudas en la población trabajadora. Impacto del brote de gripe A (H1N1)  

Microsoft Academic Search

IntroductionThis study aims to asses the impact of influenza and other acute respiratory infectious diseases (ARI) on the Catalan working population between January 2007 and December 2009, including the period of the influenza virus A (H1N1) pandemic in our region.

Constanza Albertí; Ramon Orriols; Rafael Manzanera; Josefina Jardí

2010-01-01

169

Identification of methyl triclosan and halogenated analogues in male common carp (Cyprinus carpio) from Las Vegas Bay and semipermeable membrane devices from Las Vegas Wash, Nevada  

USGS Publications Warehouse

Methyl triclosan and four halogenated analogues have been identified in extracts of individual whole-body male carp (Cyprinus carpio) tissue that were collected from Las Vegas Bay, Nevada, and Semipermeable Membrane Devices (SPMD) that were deployed in Las Vegas Wash, Nevada. Methyl triclosan is believed to be the microbially methylated product of the antibacterial agent triclosan (2, 4, 4'-trichloro-4-hydroxydiphenyl ether, Chemical Abstract Service Registry Number 3380-34-5, Irgasan DP300). The presence of methyl triclosan and four halogenated analogues was confirmed in SPMD extracts by comparing low- and high-resolution mass spectral data and Kovats retention indices of methyl triclosan with commercially obtained triclosan that was derivatized to the methyl ether with ethereal diazomethane. The four halogenated analogues of methyl triclosan detected in both whole-body tissue and SPMD extracts were tentatively identified by high resolution mass spectrometry. Methyl triclosan was detected in all 29 male common carp from Las Vegas Bay with a mean concentration of 596????g kg- 1 wet weight (ww) which is more than an order of magnitude higher than previously reported concentrations in the literature. The halogenated analogs were detected less frequently (21%-76%) and at much lower concentrations (< 51????g kg- 1 ww). None of these compounds were detected in common carp from a Lake Mead reference site in Overton Arm, Nevada.

Leiker, T. J.; Abney, S. R.; Goodbred, S. L.; Rosen, M. R.

2009-01-01

170

Tailor-made LasR agonists modulate quorum sensing in Pseudomonas aeruginosa.  

PubMed

The primary quorum sensing system in the opportunistic pathogen Pseudomonas aeruginosa is regulated through the synthesis and secretion of N-3-oxo-dodecanoyl-l-homoserine lactone (C12) which binds the transcriptional activator LasR. In this study we report the design, synthesis and biological evaluation of new analogs of C12. Analysis of the autoinducer binding site cavity of LasR revealed a positively charged cavity near the center of bound C12. Accordingly, we synthesized two piperidine-C12 diastereoisomers and tested their biological activity. Both analogs proved to be strong LasR agonists that showed a synergistic effect when presented together with the natural ligand. Moreover, binding of the analogs resulted in phenotypic changes characteristic of QS controlled receptor activation. PMID:24057196

Rabin, Nira; Delago, Antonia; Inbal, Boaz; Krief, Pnina; Meijler, Michael M

2013-10-01

171

An Aquatic Safety Assessment of Linear Alkylbenzene Sulfonate (LAS): Chronic Effects on Fathead Minnows  

Microsoft Academic Search

Life-cycle and embryo-larval toxicity tests were conducted on the fathead minnow (Pimephales promelas) with three commercial linear alkylbenzene sulfonates (LAS), anionic surfactants commonly used in laundry detergents. The no-observed-effect concentration (NOEC), as measured in life-cycle tests or estimated from embryo-larval tests, depended on the mean alkyl chain length of the LAS and was 5.1–8.4, 0.48, and 0.11–0.25 mg\\/liter for C11.2,

William F. Holman; Kenneth J. Macek

1980-01-01

172

After 58 years, an icon on the Las Vegas Strip closes  

NSDL National Science Digital Library

Las Vegas' Sahara Hotel and Casino closing after more than 58 yearshttp://news.blogs.cnn.com/2011/05/16/las-vegas-sahara-hotel-and-casino-closing-after-more-than-58-years/?hpt=C2Las Vegas Historyhttp://www.lasvegassun.com/history/Southern Nevada: The Boomtown Yearshttp://digital.library.unlv.edu/boomtown/Vegas Tripping: Implosionshttp://www.vegastripping.com/implosions/The Neon Museumhttp://neonmuseum.org/All that glitters is not gold, and when it comes to the glittering lights of the Vegas Strip, nothing is permanent. This weekend, the Sahara hotel saw its last guests leave as it ended its 58-year run on the Strip. The hotel was the brainchild of one Milton Prell, a former jewelry salesman who ran a bingo parlor in Montana. In 1952, he opened the Sahara, which he envisioned as a "jewel of the desert". The Sahara was the sixth hotel on the Strip, and with its fantastical Congo Room supper club and Casbar Lounge, it was a flourishing part of the "ring-a-ding-ding" 1950s and 1960s scene in Las Vegas. Characters who were part of the Strip's history included legendary entertainers Ray Bolger, Donald O'Connor, and Louis Prime, who performed there for years with his wife, Keely Smith. While plans for the site are in flux, it is hoped that some of the Sahara's iconic neon signs will end up in the nearby Neon Museum.The first link will take visitors to a nice article from this Saturday's Las Vegas Sun about the closing of the Sahara. The second link leads to piece from CNN's blog which also talks about the recent closing of this famed Strip stalwart. The third link will whisk users away to a terrific site from the Las Vegas Sun which chronicles the highs and lows of the Strip's history. Moving on, the fourth link leads to a nice digital collection from the University of Nevada, Las Vegas which documents the boom years of Southern Nevada through images, documents, and other archival items. The fifth link leads to a rather raucous and fun archive of Strip hotel implosions captured for posterity. Finally, the last link leads to the homepage of The Neon Museum in Las Vegas, which celebrates neon culture in all of its glory.

Grinnell, Max

2011-05-20

173

LA RESPONSABILIDAD SOCIAL DE LAS EMPRESAS TURÍSTICAS: PERCEPCIONES DE LOS ESTUDIANTES  

Microsoft Academic Search

El interés por la Responsabilidad Social Corporativa en el sector turístico queda reflejado por varios hechos. El primero es de naturaleza académica y hace referencia a que en las normas, documentos y propuestas del Espacio Europeo de Educación Superior se le otorga una importancia crítica a que el aprendizaje de competencias conlleven el respeto al medio ambiente y al patrimonio

José Alberto Martínez González

2012-01-01

174

La estructura de mercado del sector de las artes escénicas en España  

Microsoft Academic Search

La diversidad de agentes y de comportamientos, así como la complejidad que encierra la existencia e interrelación de dos mercados, el de la producción y el de la difusión, han dificultado el estudio del sistema escénico español desde perspectivas científicas. Con el objetivo de cubrir parcialmente ese vacío y presentar las especificidades de dicho sistema, el presente trabajo utiliza el

LLUÍS BONET; ANNA VILLARROYA

2009-01-01

175

Vegetation of Grassy Remnants in the Las Vegas Valley, Southern Nevada  

Microsoft Academic Search

The approximately 1000-km2 Las Vegas Valley contains a rich assemblage of unique plant communities in the eastern Mojave Desert. Yet, there is little published documentation of this vegetation as its destruction continues with proceeding urban development. Development has intensified after the 1998 Southern Nevada Public Land Management Act mandated the disposal of federal lands. We document plant communities at four

Jill E. Craig; Scott R. Abella

176

Continuous Hidden Markov Models: Application to automatic earthquake detection and classification at Las Canãdas caldera, Tenerife  

Microsoft Academic Search

A possible interaction of (volcano-) tectonic earthquakes with the continuous seismic noise recorded in the volcanic island of Tenerife was recently suggested. Also recently the zone close to Las Canadas caldera shows unusual high number of near (<25 km), possibly volcano-tectonic, earthquakes indicating signs of reawakening of the volcano putting high pressure on the risk analyst. Certainly for both tasks consistent

Moritz Beyreuther; Roberto Carniel; Joachim Wassermann

2008-01-01

177

Soltando las Amarras - Algunas consideraciones sobre la cancelación de la deuda con el FMI  

Microsoft Academic Search

Este trabajo tiene por objeto analizar dentro de los resultados y proyecciones de la deuda pública, el sentido, impacto y efectos de la decisión gubernamental de cancelar la deuda pública nacional contraída con el FMI. En tal propósito se analizan los motivos que condujeron a la decisión de desendeudarse con el FMI, examinándo las propuestas alternativas a aquella solución, barajadas

Agustin Torres

178

Apuntes sobre la información visual en la formación online de las futuras generaciones  

Microsoft Academic Search

Resumen: La información visual cobra cada vez más importancia en una sociedad en la que la imagen ha ido ganándole terreno al texto en distintos ámbitos. Las nuevas generaciones están cada vez más acostumbradas a la obtención de información a través de la pantalla de cualquier dispositivo que de una publicación impresa. La experiencia de la autora, a través de

María Teresa Sandoval Martín

2008-01-01

179

UN ANÁLISIS COMPARADO DE LOS MODELOS APLICADOS PARA LA FINANCIACIÓN DE LAS UNIVERSIDADES ANDALUZAS Y VALENCIANAS  

Microsoft Academic Search

Hasta fechas relativamente recientes los mecanismos de financiación de tipo incrementalista no suponían graves tensiones a la hora de distribuir fondos entre los diferentes servicios públicos. Pero en el actual contexto de persistente déficit de las Administraciones Públicas el diseño y utilización de sistemas de financiación que intenten racionalizar la asignacion de los recursos cobra un especial protagonismo, sobre todo

José Sánchez; Campillo Dolores; Moreno Herrero

180

POLÍTICA CRIMINAL DE LAS SANCIONES ALTERNATIVAS A LA PRISIÓN: CRITICAS AL DISCURSO OFICIAL  

Microsoft Academic Search

La pena privativa de libertad a través de la reclusión en el establecimiento carcelario, presentada como una opción alternativa y humanizante para el sistema punitivo vigente hasta el siglo XVII, que tenía como base las penas de muerte y corporales, desde su nacimiento se ha demostrado ineficiente para cumplir sus finalidades formalizadas por el ordenamiento, principalmente los que se refieren

Marcelo Nunes Apolinário

2008-01-01

181

Confianza, coacción y autoridad: un ensayo sobre el papel de la imitación en las relaciones laborales  

Microsoft Academic Search

Cualquier ensayo, sea este en el tema que sea, tiene ciertas limitaciones. En principio por especulativo, esta clase de monografías literarias no posee una estructura empírica que respalde los contenidos teóricos del mismo. Sin embargo, en muchas ocasiones los ensayos o las teorías son necesarios para interpretar y comprender contextualmente el mundo que nos rodea. Con estas aclaraciones en mente,

Maximiliano Korstanje

2007-01-01

182

DESARROLLO DE UN PROGRAMA DE SIMULACIÓN EN INGENIERÍA DE LAS REACCIONES QUÍMICAS (ECM035)  

Microsoft Academic Search

Resumen: La globalización y el auge de las nuevas tecnologías de información y comunicación y el creciente valor que tiene el conocimiento en la sociedad actual, han impuesto la presencia cada vez mayor de herramientas instruccionales asociadas al uso de plataformas educativas que han generado grandes retos en la educación así como en el docente y el alumno. Debido a

Judith Cuéllar

183

CAPABILITIES OF THE ENVIRONMENTAL MONITORING AND SUPPORT LABORATORY-LAS VEGAS  

EPA Science Inventory

This report describes the present and developing capabilities of the U.S. Environmental Protection Agency's Environmental Monitoring and Support Laboratory in Las Vegas, Nevada. Its purpose is to present comprehensive information in concise form to enable users of the Laboratory'...

184

Tectonic deposition of mercury in the Almadén district, Las Cuevas deposit, Spain  

NASA Astrophysics Data System (ADS)

The Las Cuevas mercury deposit is located in the northern part of the Almadén district, Ciudad Real, Spain. It displays characteristic epigenetic features. A reinterpretation of the geological context of the deposit and a detailed structural analysis indicate that the host rocks at Las Cuevas belong to the same stratigraphic units that host the old Almadén mine, but that they experienced a different tectonic evolution. Two types of ore are distinguished at Las Cuevas: (1) hydraulic breccias in a black quartzite, identical to the San Francisco horizon of the Almadén mine. This ore has been interpreted as syngenetic and is associated with an alkaline explosive volcanic event; and (2) a stockwork composed of horizontal subcritical tension cracks which developed along the contact between black shales and volcanic rocks in the hinge of a drag fold, and which is associated with advanced argillic alteration. Mobilization of mercury from type 1 to type 2 ore was related to a local inversion of the stress field associated with an increase of permeability by self-sealing, which probably occurred during uplift. Las Cuevas is representative of a whole class of mercury deposits hosted within basement rocks.

Jébrak, M.; Hernandez, A.

1995-10-01

185

El papel de las Brigadas Internationales en el cine documental extranjero (1936-1939)  

Microsoft Academic Search

El cine fue utilizado como elemento de propaganda durante la Guerra Civil española. Las Brigadas Internacionales nunca tuvieron una productora cinematográfica propia. Por esta razón, algunos documentales fueron filmados en el Reino Unido, los Estados Unidos y Francia, producidos por organismos progresistas. La estructura interna de los brigadistas no es analizada, pero se destaca su solidaridad en la lucha contra

Magi Crusells

2004-01-01

186

SIMULATION MODELING OF THE SHALLOW GROUND-WATER SYSTEM IN LAS VEGAS VALLEY, NEVADA  

EPA Science Inventory

The vast influx of population began pouring into the Las Vegas Valley in the 1940's the hydrologic regime of the Valley has undergone significant change. This domestic irrigation of vegetation together with wastewater return flows has caused a perennial stream leaving the Valley ...

187

Las Quinas: Un nuevo sitio de la Cultura de La Aguada en San Juan  

Microsoft Academic Search

The study of the Las Quinas rock shelter, in the Iglesia valley (San Juan, Argentina) confirms the existence of cul- tural traits that have been defined for the period of La Aguada influence in the preandean valleys of Iglesia and Calingasta, features such as settlements types, cultivated seeds, and gathering goods, ceramic and textile. Radio- carbon dating was indicated a

Mariano Gambier

2002-01-01

188

Nutrición deportiva en la infancia: Cumplimiento de las demandas metabólicas del crecimiento y el ejercicio  

Microsoft Academic Search

ExtractoLos objetivos fundamentales de la infancia son el crecimiento y la maduración óptimos. Estos procesos relacionados con el desarrollo exigen un balance energético y nitrogenado positivo. Aunque la actividad física regular puede intensificar el desarrollo en la infancia, un entrenamiento físico extenuante puede reducir las reservas de energía y nitrógeno del organismo que, entonces, deberán reemplazarse a través de la

C. L. Zanker

2006-01-01

189

Notes on a Critical Edition of Para las seis cuerdas by Jorge Luis Borges  

Microsoft Academic Search

Jorge Luis Borges orchestrated the canonization of his work, culminating in his Obras completas. The traces of this editorial endeavor are effaced in what Borges conceived as his complete works. The analysis of the various editions of Para las seis cuerdas demonstrates that the rationale behind the editorial changes is a conscious effort to present a collection of milongas with

Robert Folger

2001-01-01

190

PERCHLORATE UPTAKE BY SALT CEDAR (TAMARIX RAMOSISSIMA) IN THE LAS VEGAS WASH RIPARIAN ECOSYSTEM  

EPA Science Inventory

Perchlorate ion (CIO4-) has been identified in samples of dormant salt cedar (Tamarix ramosissima) growing in the Las vegas Wash. Perchlorate is an oxidenat, but its reduction is kineticaly hindered. CXoncern over thyrpoid effects caused the Environmental Protection Agency (EPA...

191

Helicopter noise survey performed at Las Vegas, Nevada, 19-21 January, 1984  

Microsoft Academic Search

The FAA conducted a noise measurement survey of helicopter operations at Las Vegas during the Annual Helicopter Association International Convention. The survey was performed during the period of January 19-21, 1984. The purpose of this noise survey was to obtain additional noise data for a number of different helicopter models during normal operations in an urban environment. This survey was

S. R. Albersheim

1984-01-01

192

Modelos vs. dibujos: el caso de la enseñanza de las fuerzas intermoleculares  

Microsoft Academic Search

Resumen: En el presente trabajo se analizan las explicaciones verbales y gráficas confeccionadas por docentes para explicar fenómenos de solubilidad, inmiscibilidad y formación de una emulsión con mezclas de agua, alcohol y aceite. El análisis permite considerar la complejidad de los lenguajes expertos como fuente de obstáculos epistemológicos en la comunicación entre docentes y estudiantes. Finalmente, se propone un marco

Lydia Galagovsky; María Angélica Di Giacomo; Verónica Castelo

193

Científicos que cuestionan los paradigmas dominantes: Algunas implicaciones para la enseñanza de las ciencias  

Microsoft Academic Search

In this work I present the topic of the scientists that challenge dominant paradigms. This reality can help us to deepen in the nature of the science, at the same time that can have applications for science teaching. Palabras clave: Filosofía de la ciencia, paradigmas dominantes, cambio conceptual, resistencia al descubrimiento, enseñanza de las ciencias.

Juan Miguel Campanario

2004-01-01

194

SOURCE AND PATHWAY DETERMINATION FOR BERYLLIUM FOUND IN BECHTEL NEVADA NORTH LAS VEGAS FACILITIES  

Microsoft Academic Search

In response to the report ''Investigation of Beryllium Exposure Cases Discovered at the North Las Vegas Facility of the National Nuclear Security Administration'', published by the U.S. Department of Energy (DOE), National Nuclear Security Administration (NNSA) in August 2003, Bechtel Nevada (BN) President and General Manager Dr. F. A. Tarantino appointed the Beryllium Investigation & Assessment Team (BIAT) to identify

2004-01-01

195

Capital intelectual: un modelo de mediciòn en las empresas del nuevo milenio  

Microsoft Academic Search

Resumen En el mundo globalizado en el que hoy viven las organizaciones, la dirección empresarial ha pasado de reconocer la importancia de los inversionistas, a reconocer el valor de los clientes y de aquéllos que trabajan en la organización. La empresa en sus productos o servicios vende algo más que el producto o servicio, vende un agregado representado por diversos

Juan Manuel Larios Prado

2010-01-01

196

SUELOS DE LA CUENCA DEL SANTO DOMINGO. SECTOR LAS MESAS. (CARACTERIZACIÓN FÍSICO- QUÍMICA). MÉRIDA-VENEZUELA  

Microsoft Academic Search

The soils of the area of Las Mesas, basin Santo Domingo, Mérida state, are conditioned in the fundamental for the position geomorphologic of strong slopes. The action biochemical is the one which permits the construction of the soils in spite of the conditions of discharges precipitation and of moderate temperatures. The soils in accordance with Soil Taxonomy (Soil Survey Staff,

Dolores Gutiérrez; Guido Ochoa; Jajaira Oballos; Juan Carlos Velásquez

197

Geology of the Gualan and Southern Sierra de las Minas Quadrangles, Guatemala  

NASA Astrophysics Data System (ADS)

The Gualan and Sierra de las Minas quadrangles straddle the Motagua Valley fault zone, a major southerly convex fault zone of Nuclear Central America, and the active transform boundary between the North American and Caribbean plates. Two distinctly different pre-Mesozoic metamorphic basement complexes are exposed in the area. The Chuacus Group crops out north of the Motagua Valley. The Las Ovejas Complex crops out south of the valley. Early Tertiary rift basins received clastic deposits of the Subinal Formation. Concurrently, hornblende diorite and La Union pluton granodiorites intruded the Las Ovejas. Sinistral strike slip motion began in the Miocene and the Junquillo pull apart basin formed between the Cabanas and Jubuco faults along the south side of the valley. Las Ovejas Complex rocks between these faults were mylonitized during the faulting. Southerly derived Plio-Quaternary alluvial fans in the Junquillo basin have been offset left laterally as much as 15 to 20 km from their source areas by the Jubuco fault. A shift in the active trace of the Jubuco fault led to uplift of the western Junquillo basin during the Quaternary. The Cabanas fault is now the active plate boundary.

Johnson, K. R.

198

Geophysical constraints on the location and geometry of the Las Vegas Shear Zone, Nevada  

USGS Publications Warehouse

We model the basin configuration beneath Las Vegas Valley, Nevada, on the basis of gravity, drillhole, and seismic reflection data. We locate and characterize the various strands of the Las Vegas Valley Shear Zone (LVVSZ) by variations in basin thickness beneath the valley. The pre-Tertiary bedrock surface is complex, with subbasins buried beneath the flat alluvial surface of the valley. We suggest that these basins are formed from transtensional strain. Subbasins elongated N70??W and N50??W are interpreted as strike-slip basins. The deepest subbasin is 5 km west of Frenchman Mountain and strikes N40??E. This basin probably formed by combined movement on nonparallel strands of the LVVZ and an earlier episode of normal faulting. The basin thickness map constrains the minimum depth of the inferred detachment fault beneath Las Vegas Valley to at least 4 km. Seismic reflection data do not image a detachment fault in the upper 10 km beneath Las Vegas Valley. Our results also illustrate the utility of gravity in determining basinal structures and providing a three-dimensional perspective in areas with limited seismic reflection control.

Langenheim, V. E.; Grow, J. A.; Jachens, R. C.; Dixon, G. L.; Miller, J. J.

2001-01-01

199

Crustal structure in the vicinity of Las Vegas, Nevada, from seismic and gravity observations  

USGS Publications Warehouse

A seismic-refraction profile indicates that the crust of the Earth increases in thickness by as much as 5 km over a horizontal distance of less than 25 km northeast of Las Vegas, Nevada. This feature correlates with a decrease in the Bouguer anomaly and an increase in the average surface altitude.

Roller, John C.

1963-01-01

200

Response-Induced Reversals of Preference in Gambling: An Extended Replication in Las Vegas  

Microsoft Academic Search

Extends previous studies (which used undergraduates in a laboratory setting) of the effects of response mode on information-processing strategies used in gambling decisions in a Las Vegas casino using a professional dealer as E and 44 casino patrons as Ss. As in the laboratory, the casino patrons used different strategies when choosing among pairs of bets than when attaching monetary

Sarah Lichtenstein; Paul Slovic

1973-01-01

201

La evaluación del desempeño de las empresas privatizadas en Colombia: ¿Coincide con la experiencia internacional?  

Microsoft Academic Search

Este estudio pretende evaluar si las empresas que fueron privatizadas en Colombia durante los años 1990 mejoraron sustancialmente su productividad y rentabilidad, como consecuencia de los cambios gerenciales que se debieron dar, o si por el contrario, continuaron en niveles similares, contrariando la hipótesis de que los nuevos dueños propiciarían cambios sustanciales en su estrategia, como lo demuestra la experiencia

Héctor Ochoa Díaz; Jaime Andrés Collazos Rodríguez

2004-01-01

202

El VIH y las ramificaciones para la seguridad alimentaria y la salud infantil en comunidades afectadas  

Microsoft Academic Search

ExtractoLos primeros casos de síndrome de inmunodeficiencia adquirida (SIDA), causada por el virus de la inmunodeficiencia humana (VIH), se identificaron en 1981. Actualmente se estima en 39 millones las personas infectadas en todo el mundo por el virus. Aunque el 64% de estos individuos viven actualmente en la pobreza de África subsahariana, la pandemia se está propagando en estos momentos

Noel W. Solomons; Gwen Ellen O’Donnell

2007-01-01

203

Las habilidades comunicativas en estudiantes de la especialidad contabilidad y finanzas: una propuesta de actuación  

Microsoft Academic Search

Las instituciones universitarias están llamadas a formar profesionales que darán continuidad a la obra social que construimos. La imagen del mismo lleva implícita el dominio de una serie de cualidades que le permitan expresarse correctamente. Un reciente estudio realizado a futuros graduados de quinto año en la especialidad Contabilidad y Finanzas del Centro Universitario Municipal de Lajas acerca del desarrollo

Daylin Yera Jacomino

2011-01-01

204

Methodology for designing air quality monitoring networks: II. Application to Las Vegas, Nevada, for carbon monoxide  

Microsoft Academic Search

An objective methodology presented in a companion paper (Liu et al., 1986) for determining the optimum number and disposition of ambient air quality stations in a monitoring network for carbon monoxide is applied to the Las Vegas, Nevada, area. The methodology utilizes an air quality simulation model to produce temporally-varying air quality patterns for each of a limited number of

J. L. McElroy; J. V. Behar; T. C. Meyers; M. K. Liu

1986-01-01

205

Books by Mail Service; A Conference Report (Las Vegas, Nevada, June 23, 1973).  

National Technical Information Service (NTIS)

When representatives of public libraries with programs to deliver books to patrons by mail met in Las Vegas, Nevada, in June of 1973, the conference brought to a sharp focus the emergence of two different types of books by mail (BBM) programs. One is the ...

C. H. Kim I. M. Sexton

1974-01-01

206

Books by Mail Service; A Conference Report (Las Vegas, Nevada, June 23, 1973).  

ERIC Educational Resources Information Center

|When representatives of public libraries with programs to deliver books to patrons by mail met in Las Vegas, Nevada, in June of 1973, the conference brought to a sharp focus the emergence of two different types of books by mail (BBM) programs. One is the urban or metropolitan program serving the four to six percent of the urban population who are…

Kim, Choong H.; Sexton, Irwin M.

207

METHODOLOGY FOR DESIGNING AIR QUALITY MONITORING NETWORKS: 2. APPLICATION TO LAS VEGAS, NEVADA, FOR CARBON MONOXIDE  

EPA Science Inventory

An objective methodology presented in a companion paper (Liu et al., 1986) for determining the optimum number and disposition of ambient air quality stations in a monitoring network for carbon monoxide is applied to the Las Vegas, Nevada, area. The methodology utilizes an air qua...

208

Between Poverty and a Lifestyle: The Leisure Activities of Homeless People in Las Vegas  

Microsoft Academic Search

Housed people judge homeless people, and in particular their leisure activities, as indicators of whether that person has chosen a “homeless lifestyle” and therefore deserves homelessness. To achieve a more complex understanding of contemporary homelessness, the author conducted ethnographic fieldwork over ten months in Las Vegas, Nevada, interviewing and participant observing dozens of homeless men and women, including observations of

Kurt Borchard

2010-01-01

209

LIGHTNING PERFORMANCE OF TRANSMISSION LINE LAS CLARITAS - SANTA ELENA UP 230 KV  

Microsoft Academic Search

The following work is calculated the lightning performance of transmission line Las Claritas - Santa Elena up 230 kV. This line has the particularity that goes through an area with high keraunic level and resistivity soil, where supports (towers or poles) are placed. When the commercial operation of the line begin, some outages by atmospheric discharges happen and to correct

210

Probabilistic risk assessment for linear alkylbenzene sulfonate (LAS) in sewage sludge used on agricultural soil.  

PubMed

Deterministic and probabilistic risk assessments were developed for commercial LAS in agricultural soil amended with sewage sludge. The procedure done according to ILSI Europe's Conceptual Framework [Schowanek, D., Carr, R., David, H., Douben, P., Hall, J., Kirchmann, H., Patria, L., Sequi, P., Smith, S., Webb, S.F., 2004. A risk-based methodology for deriving quality standards for organic contaminants in sewage sludge for use in agriculture-conceptual Framework. Regul. Toxicol. Pharmacol. 40 (3), 227-251], consists of three main steps. First, the most sensitive endpoint was determined. This was found to be the chronic ecotoxicity of LAS to soil invertebrates and plants. Additional endpoints, such as potential for plant uptake and transfer in the food chain, leaching to groundwater, surface erosion run-off, human health risk via drinking water, plant consumption and soil ingestion were also systematically evaluated but were all assessed to be of little toxicological significance. In the second step, a back-calculation was conducted from the Predicted No-Effect Concentration in soil (PNECsoil) to a safe level of LAS in sludge (here called 'Sludge Quality Standard'; SQS). The deterministic approach followed the default agricultural soil exposure scenario in the EU-Technical Guidance Document (TGD). The SQS for LAS was calculated as 49 g/kg sludge Dry Matter (DM). In order to assess the potential variability as a result of varying agricultural practices and local environmental conditions, two probabilistic exposure assessment scenarios were also developed. The mean SQS was estimated at 55 and 27.5 g/kg DM for the homogeneous soil mixing and soil injection scenarios, respectively. In the final step, the resulting SQS values were evaluated for consistency and relevance versus available information from agricultural experience and field tests. No build-up, adverse impact on soil fertility, agronomic performance, or animal/human health have been reported for agricultural fields which have received sludge with high LAS levels for up to 30 years. Distribution statistics of LAS concentrations in anaerobically digested sewage sludge measured across Europe were created (mean value: 5.56 g LAS/kg sludge DM). When compared to the above mean SQS values, adequate risk characterisation ratios of 0.08-0.2 were found. The 'ecological risk' parameter calculated for anaerobic sludge from the probabilistic approaches was below 3%. A regulatory Limit Value for LAS of 2.60 g/kg sludge DM was originally proposed in the 3rd Draft of the Working Document on Sludge [CEC, 2000b. Working Document on Sludge. Third Draft, Brussels 27 April 2000, DG. Environment, 18 p.]. The current assessment, based on an updated dataset and a refined assessment procedure, suggests that the need for a limit value for LAS in sewage sludge cannot be substantiated on a risk basis. PMID:17967498

Schowanek, Diederik; David, Helen; Francaviglia, Rosa; Hall, Jeremy; Kirchmann, Holger; Krogh, Paul Henning; Schraepen, Nathalie; Smith, Stephen; Wildemann, Tanja

2007-09-19

211

Comparación de dos sistemas de medida de las concentraciones de glucosa en líquido cefalorraquídeo en la anestesia intradural hiperbara  

Microsoft Academic Search

® (Beckman Coulter) con las reali- zadas con un glucómetro Ascensia EliteXL&Elite ® durante la anestesia espinal, después de administrar 10 mg de bupivacaína hiperbara para así disponer de un método rápido y fiable al medir las cifras de glucorra- quia durante una anestesia espinal continua y seguir su evolución. PACIENTES Y MÉTODOS: Estudio prospectivo de 34 pacientes bajo anestesia

J. Sánchez Morillo; J. Soliveres Ripoll; N. Estañ Capell; C. Solaz Roldán; P. Viñals Bellido; C. Quiñones Torrelo

2007-01-01

212

Public relations and strategic issues management challenges in Venezuela: A discourse analysis of Crystallex International Corporation in Las Cristinas  

Microsoft Academic Search

This investigation, using critical discourse analysis (CDA), seeks to develop an understanding of strategic issues management through Crystallex International Corporation’s discursive construction and management of legitimacy in the Las Cristinas mine in Venezuela. This analysis of the Las Cristinas case unearths elements that could provide useful insights about the Latin American environment in general and public relations efforts in that

Karina Peñaloza de Brooks; Damion Waymer

2009-01-01

213

Linear alkylbenzene sulfonate (LAS) in water of Lake Dianchi--spatial and seasonal variation, and kinetics of biodegradation.  

PubMed

For the purpose of elucidating the environmental characteristics of anion surfactants [linear alkylbenzene sulfonates (LAS)] in the water of Lake Dianchi, a sampling investigation in the field from October 2006 to July 2007 and a batch of biodegradation experiments in the laboratory were carried out. The results showed that concentrations of LAS ranged from 18.6 to 260.1 ?g L(-1), and the average concentration was 52.6 ?g L(-1) in Lake Dianchi. The highest concentrations of LAS were found in the Northwest region, and the distribution of LAS varied through seasons, with much lower concentrations in fall than in any other seasons. LAS can be primarily biodegraded by microorganisms in the lake water, and the percentage of degradation was >97% after 28 days. Biodegradation of LAS was well-fitted with the kinetic model presented in this paper, and the half-lives ranged from 3.2 to 16.3 days. Temperature, pH, and initial concentrations could affect the biodegradation of LAS, among which temperature was the major factor influencing on biodegradation of LAS in water of Lake Dianchi. PMID:20072810

Wang, Zhi; Xiao, Bangding; Wu, Xingqiang; Tu, Xinhai; Wang, Yingcai; Sun, Xiaolei; Song, Lirong

2010-01-14

214

Effect of linear alkylbenzene sulfonate (LAS) on ion transport and intracellular calcium in kidney distal epithelial cells (A6)  

Microsoft Academic Search

Linear alkylbenzene sulfonate (LAS) is found in near-shore environments receiving wastewater from urban treatment plants in a concentration reported to have physiological and toxic effect on aquatic organisms. The aim of this study was to investigate the effect LAS on ion transport and homeostasis in epithelia cells. A6 cells form a polarised epithelium when grown on permeable supports, actively absorb

H. F Bjerregaard; S Stærmose; J Vang

2001-01-01

215

Acute Toxicity of LAS Homologues in Marine Microalgae: Esterase Activity and Inhibition Growth as Endpoints of Toxicity  

Microsoft Academic Search

The toxicity of two linear alkylbenzene sulfonate (LAS) homologues (C10 and C13) was evaluated in four marine microalgae (Nannochloropsis gaditana, Tetraselmis suecica, Rhodomonas salina, and Isocrysis galbana), using growth inhibition rate and esterase activity (measured by flow cytometry) as endpoints. The inhibitor effect was higher for the C13 LAS homologue than for C11, in both responses analyzed. When both endpoints

M. Hampel; I. Moreno-Garrido; C. Sobrino; L. M. Lubián; J. Blasco

2001-01-01

216

77 FR 28569 - Reorganization and Expansion of Foreign-Trade Zone 89 Under Alternative Site Framework, Las Vegas...  

Federal Register 2010, 2011, 2012, 2013

...Foreign-Trade Zone 89 Under Alternative Site Framework, Las Vegas, NV Pursuant to its authority under the Foreign-Trade Zones...area of Clark County, Nevada, within and adjacent to the Las Vegas U.S. Customs and Border Protection port of entry, FTZ...

2012-05-15

217

Intensidad innovadora, permanencia exportadora, y destino de las exportaciones:análisis para una muestra de empresas de Cali  

Microsoft Academic Search

En este estudio se analiza la relación entre la exposición a los mercados internacionales (medida por medio de las exportaciones a los países desarrollados) y la innovación (en procesos, productos, diseño, empaque, organización y nuevas tecnologías). Básicamente, se busca estudiar la hipótesis de que las empresas realizan un mayor esfuerzo innovador en la medida en que enfrentan la competencia en

Alexander Correa Ospina

2005-01-01

218

Cómo medir la quiebra de las empresas en Santander, el modelo logístico: una herramienta para evaluar el riesgo de quiebra  

Microsoft Academic Search

Las propuestas contenidas en el documento del Nuevo Acuerdo de Capital de Basilea, para medir el riesgo de crédito, sirven de base para medir también el riesgo de quiebra de las empresas con base en la utilización de ratios financieros internos. En la práctica se presentan situaciones en la que es necesario tomar decisiones de acuerdo con el comportamiento de

José Joaquín Alzate Marín

2008-01-01

219

Degradation of lineal alkylbenzene sulphonate (LAS) in an acidogenic reactor bioaugmented with a Pseudomonas aeruginosa (M113) strain.  

PubMed

The degradation of of lineal alkylbenzene sulphonate (LAS) was studied in a two-stage anaerobic system where the acidogenic reactor was bioaugmented with a strain of Pseudomonas aeruginosa (M113). This is a strain, which under aerobic and denitrifying conditions uses LAS as carbon source. Results show that LAS was only degraded within the acidogenic stage while in the methanogenic reactor there was no degradation and eventually there was an inhibition due to a LAS accumulation in the sludge. During the experiment, the M113 strain remained in the acidogenic conglomerate (at around 10(4) CFU/mL) although there is no evidence of their involvement in LAS degradation. PMID:11575083

Almendariz, F J; Meráz, M; Soberón, G; Monroy, O

2001-01-01

220

La Mujer Chicana. (The Chicana Woman).  

ERIC Educational Resources Information Center

|As objectives for this secondary level unit, students are to: (1) read the unit with comprehension; (2) demonstrate their comprehension of the Chicana's history by participating in an oral discussion utilizing four discussion questions; and (3) correctly answer 15 of the 20 questions on a multiple choice test. The unit consists of a brief history…

Herrera, Gloria; Lizcano, Jeanette

221

Proyecto Del Progreso De La Mujer.  

ERIC Educational Resources Information Center

Women farmworkers and staff members of farmworker organizations revealed barriers (e.g. lack of education, training, transportation, family responsibility, spouse's cooperation) that limit women's participation in all levels of farmworker organizational structure. Available from Farmworker Data Network, 7905 W. 44th, Wheat Ridge, Colorado 80033…

Flores, Oralia T.

1979-01-01

222

Essays on La Mujer. Anthology No. 1.  

ERIC Educational Resources Information Center

|The 10 essays introduce some concepts and topics of particular concern and interest to those wishing to analyze the situation of the Chicana within her particular historical, social and economical context. Topics of the essays are: (1) the Chicana labor force; (2) the role of the Chicana within the student movement; (3) the Chicana and the…

Sanchez, Rosaura, Ed.; Cruz, Rosa Martinez, Ed.

223

El sentido libre de ser mujer  

Microsoft Academic Search

I want tho reflect or reveal a Kind of picture that could be like the images of a film, and that have to do with my life. My poetry is not separate from my life, but rather it forms part of my biography. Poety, to become poery, has to go through some transformations in order to make that work of

Juana Castro

2008-01-01

224

La Mujer Chicana. (The Chicana Woman).  

ERIC Educational Resources Information Center

As objectives for this secondary level unit, students are to: (1) read the unit with comprehension; (2) demonstrate their comprehension of the Chicana's history by participating in an oral discussion utilizing four discussion questions; and (3) correctly answer 15 of the 20 questions on a multiple choice test. The unit consists of a brief history…

Herrera, Gloria; Lizcano, Jeanette

225

Prevención de la listeriosis en mujeres hispanas ...  

Center for Food Safety and Applied Nutrition (CFSAN)

... Recientemente se informaron de brotes de listeriosis serios en California, Washington y Carolina del Norte, donde 12 casos de personas ... More results from www.fda.gov/food/foodborneillnesscontaminants/peopleatrisk

226

Prevención de la listeriosis en mujeres hispanas ...  

Center for Food Safety and Applied Nutrition (CFSAN)

Este completo manual incluye información de respaldo, preguntas y respuestas communes, y un conjunto de materiales reproducibles para ayudarle ... More results from www.fda.gov/food/foodborneillnesscontaminants/peopleatrisk

227

Effect of linear alkylbenzene sulfonate (LAS) and atrazine on marine microalgae.  

PubMed

Five marine microalgae (Tetraselmis chuii, Rhodomonas salina, Chaetoceros sp., Isochrysis galbana (T-iso) and Nannochloropsis gaditana), in the same biovolume quantity, were exposed to 72h growth-inhibition tests with atrazine and LAS. In all cases, the inhibition effect of atrazine was higher than that of LAS up to two orders of magnitude higher in the case of T. chuii. In a second part of the study, initial cellular densities for each microalga strain and fixed organic compound concentration were varied, and results show density has a clear influence in growth inhibition tests. Finally, the sum of all data obtained in the study was expressed in terms of "toxic cellular quota" (mass of chemical substance per cell). The result was a sigmoid curve with a good fit, including the two main factors in toxicity tests, initial cellular density and contaminant concentration. This toxic cellular quota exhibits a general tendency to increase with cell volume/size. PMID:18331743

Debelius, B; Forja, J M; Del Valls, A; Lubián, L M

2008-03-10

228

Marine microalgae toxicity test for linear alkylbenzene sulfonate (LAS) and alkylphenol ethoxylate (APEO).  

PubMed

Different microalgal species have been used in growth-inhibition tests to determine the toxic concentrations of anionic and non-ionic surfactants to phytoplankton. The species used were selected from different taxonomic groups, all of considerable ecological relevance to marine environments. The toxicity of the C13 LAS homologue to the microalgal species selected was usually one order of magnitude greater than that of the C11 homologue. The toxicity of a commercial LAS mixture to different microalgal species was also checked. For this material and C. gracilis, cellular counting by means of a Neubauer chamber and by use of a flow cytometer were compared; differences between the two methods were insignificant. The toxicity of decaethoxylated nonylphenol non-ionic surfactant to C. gracilis was also checked; the EC50 value for this compound was 1.0 mg L(-1). PMID:11760055

Moreno-Garrido, I; Hampel, M; Lubián, L M; Blasco, J

2001-10-01

229

Sealing 304L to lithia-alumina-silica (LAS) glass-ceramics  

SciTech Connect

The formation of a crack-free between 300 series stainless steel and a glass-ceramic is difficult owing to the high coefficients of thermal expansion of the stainless steels. Lithia-alumina-silica (LAS) glass-ceramics were successfully developed and sealed to 304L stainless steel. These crack-free seals were fabricated by two techniques: by adjusting the parent glass composition (reducing the Al{sub 2}O{sub 3} content), or by adjusting the sealing/crystallization cycle. All seals were hermetic, with leak rates < 10{sup -8} cc/sec STP helium. CTE and alloy yield strengths are given which show the feasibility of using these materials to make feedthroughs, pyrotechnic components, etc. Metallography, SEM, and wavelength dispersive spectroscopy show the quality and integrity of the glass-ceramic/stainless steel interface. These data are compared to those on the Inconel 718/LAS-glass seal system.

Moddeman, W.E.; Pence, R.E.; Massey, R.T.; Cassidy, R.T. [EG and G Mound Applied Technologies, Miamisburg, OH (United States); Kramer, D.P. [EG and G, Inc., Albuquerque, NM (United States). Electronic Components Div.

1989-12-31

230

Geologic Interpretation of the Las Vegas Valley Based on Industry Seismic Reflection Data  

NASA Astrophysics Data System (ADS)

Las Vegas Valley, NV is located in the southern Basin and Range Province where the basin was formed by the Las Vegas Valley Shear Zone as well as by several thrust and normal faulting events that occurred by Cenozoic time. The geology and tectonic setting in the Las Vegas region is poorly understood given the fact that many structures have been covered by the constant growth of the City. National studies of ground motion and amplification of seismic energy placed Nevada third in the list of states having the potential for loss of life and property due to earthquakes. The Las Vegas area has a high potential for strong ground shaking due its thick basin fill and associated amplification. Due to the amplification effects within the Valley, moderate nearby quakes or large distant quakes will produce a large amount of damage in the Valley. Las Vegas, though not known for its earthquakes, has numerous micro quakes and an active seismic history. In a study using HAZUS to predict damage associated with a M6.9 earthquake, the loss would be billions of dollars with thousands of lives lost. Long-term economic loss would be in the several billions of dollars. Recently, several normal faults, which have the potential to produce a M6.5 to 7.0 earthquake, were reclassified as active tectonic fault with Quaternary movement. As a result, there has been increased effort to understand the Las Vegas Valley and to assess its potential for seismic hazards. One such effort included acquiring industry reflection profiles that cross the Valley. In the 1980's, north/south and east/west trending reflection lines with intersecting tie points were placed between Frenchman Mountain to the East and Spring Mountains to produce seismic profiles using Vibroseis. The profiles, which are over 200 kilometers in length and extend down to 5 s in time or approximately 15 km depth, will provide a tie between the surface work that is currently being conducted and the crustal velocity models that are being calculated to produce a seismic hazard potential for the Las Vegas Valley. The quality of the Vibroseis data is very high. We have been able to locate the basin/bedrock contact as well as several faults that cut the sections. All of which have been mapped on the shot point map. Most of the faults appear to be normal faults listric in character that trend north-south paralleling the structure of the southern Basin and Range. Basin geometry and associated minor folding, which have been truncated by minor faulting, can be seen across the profiles. Some faults can be seen as tectonic in origin while others are merely subsidence faulting from basin settling. With this new data we will identify structures that could potentially focus energy in the sub-surface adding to our growing knowledge of the basin geometry. In addition, this data will be incorporated into the seismic hazard model that is being developed for the Las Vegas Valley and will provide very detailed geologic information that has not been previously available.

Hirsch, A.; Snelson, C. M.

2003-12-01

231

Bifurcación de las soluciones de vientos impulsados por radiación en estrellas Be: formación de líneas  

NASA Astrophysics Data System (ADS)

Se ha estudiado la topología de la ecuación hidrodinámica no-lineal que describe el perfil de velocidades de vientos impulsados por radiación en estrellas tempranas. Al aplicar este modelo a estrellas Be se encuentra que existen dos tipos De soluciones: la estándar, que describe el viento polar, y una nueva, que describe un viento más denso y lento y que explicaría el disco que se encuentra alrededor de estos objetos. Existe una región de transición en donde ambas soluciones coexisten (bifurcación}). Ambas soluciones satisfacen en esta región las mismas condiciones de borde. Para estas dos soluciones se han obtenido los perfiles de líneas de hidrógeno del visible y del IR, resolviendo el transporte de radiación en el ``comoving frame". Para la solución estándar, se obtienen perfiles con componentes en emisión, mientras que para la nueva solución se obtienen perfiles en absorción. Se comparan cualitativamente los resultados con las observaciones.

Curé, M.; Rial, D.; Cidale, L.; Venero, R.

232

Quorum-Sensing-Negative (lasR) Mutants of Pseudomonas aeruginosa Avoid Cell Lysis and Death  

Microsoft Academic Search

In Pseudomonas aeruginosa, N-acylhomoserine lactone signals regulate the expression of several hundreds of genes, via the transcriptional regulator LasR and, in part, also via the subordinate regulator RhlR. This regulatory network termed quorum sensing contributes to the virulence of P. aeruginosa as a pathogen. The fact that two supposed PAO1 wild-type strains from strain collections were found to be defective

Karin Heurlier; Valerie Denervaud; Marisa Haenni; Lionel Guy; Viji Krishnapillai; Dieter Haas

2005-01-01

233

Pasado, presente y futuro de las dimensiones pública y social en el desarrollo conceptual del marketing  

Microsoft Academic Search

Resumen  Bien sabido es lo conveniente que resulta delimitar conceptual y metodológicamente un fenómeno o circunstancia antes de proceder\\u000a a su estudio, afirmación que cobra pleno sentido si a lo que se está haciendo referencia es a las dimensiones páblica y social\\u000a del marketing. A partir de dicho planteamiento, en el presente trabajo se lleva a cabo un análisis de la

José Luis Vézquez Burguete

2004-01-01

234

Formation of soil macropores and preferential migration of linear alkylbenzene sulfonate (LAS) in soils  

Microsoft Academic Search

Effects of freeze-thaw and wet-dry cycles on the formation of soil macropores and preferential flow under simulative conditions in the laboratory, and preferential migration of linear alkylbenzene sulfonate (LAS) in paddy and soybean soils in field lysimeters were studied. Results showed that both freeze-thaw and wet-dry cycles could cause macropores and preferential flow in soils and that the former was

Ziqing Ou; Liangqing Jia; Haiyan Jin; Ayfer Yediler; Xia Jiang; Antonius Kettrup; Tieheng Sun

1999-01-01

235

Effect of the test media and toxicity of LAS on the growth of Isochrysis galbana  

Microsoft Academic Search

In this paper, the toxicity of linear alkylbenzene sulfonate (LAS) was evaluated in the marine microalga Isochrysis galbana using data of growth inhibition toxicity tests at 96-h exposure time. Toxicity was examined in standard conditions and by\\u000a means of the modification of two variables of the test media: (1) the dilution water and (2) the content of nutrients in the

M. C. Garrido-Perez; J. A. Perales-VargasMachuca; E. Nebot-Sanz; D. Sales-Márquez

2008-01-01

236

Marine microalgae toxicity test for linear alkylbenzene sulfonate (LAS) and alkylphenol ethoxylate (APEO)  

Microsoft Academic Search

Different microalgal species have been used in growth-inhibition tests to determine the toxic concentrations of anionic and non-ionic surfactants to phytoplankton. The species used were selected from different taxonomic groups, all of considerable ecological relevance to marine environments. The toxicity of the C13 LAS homologue to the microalgal species selected was usually one order of magnitude greater than that of

I. Moreno-Garrido; M. Hampel; L. M. Lubián; J. Blasco

2001-01-01

237

Exposure of the marine deposit feeder Hydrobia ulvae to sediment associated LAS  

Microsoft Academic Search

Linear Alkylbenzene Sulfonates (LAS) effects (mortality, egestion rate, behaviour) on the marine deposit feeder Hydrobia ulvae were assessed in whole-sediment and water-only systems. The results were combined with a bioenergetic-based kinetic model of exposure pathways to account for the observed toxicity. The 10-d LC50 value based on the freely dissolved fraction was 9.3 times lower in spiked sediment (0.152 ± 0.001 (95%

A. Mauffret; A. Rico-Rico; A. Temara; J. Blasco

2010-01-01

238

Site response zones and short-period earthquake ground motion projections for the Las Vegas Basin  

Microsoft Academic Search

A deterministic seismic hazard analysis was conducted to address the effect of local soil conditions on earthquake-induced\\u000a strong ground motion in the Las Vegas Basin, Nevada (US). Using a large geological and geotechnical database, two response\\u000a units were defined: a fine-grained unit, predominantly clay; and a coarse-grained unit, predominantly gravel. A moderate number\\u000a of high-quality shallow shear wave velocity measurements

Barbara Luke; Ying Liu

2008-01-01

239

Novel dihydroquinoline-based MABAs; clues to the identity of LAS-190792: evaluation of WO20111411802.  

PubMed

Bifunctional aromatic compounds are claimed to contain a ?(2) agonist pharmacophore linked by a flexible lipophilic spacer incorporating a trans-4-aminocyclohexanol group to a muscarinic antagonist pharmacophore. The compounds display nanomolar affinity at both ?(2) and M(3) receptors and a prolonged duration of action in animal models. This application is the first from Almirall claiming such compounds although it has recently disclosed that LAS-190792 is progressing toward clinical development. PMID:22251094

Norman, Peter

2012-01-18

240

Giant gas bubbles in a rheomorphic vent fill at the Las Cañadas caldera, Tenerife (Canary Islands)  

Microsoft Academic Search

During rheomorphism subsequent to fallout deposition, a portion of the densely welded fallout of the La Grieta Member flowed\\u000a back into the vent from where it was erupted, while the rest of it flowed down the outer slopes of the Las Cañadas caldera\\u000a in Tenerife. The welded fallout and conduit-vent structure are physically connected and constitute a rare example of

Carles Soriano; Daniele Giordano; Inés Galindo; Marcel Hürlimann; Paola Ardia

2009-01-01

241

Longitudinal-acoustic-phonon softening in YS, LaS, and CeSe  

Microsoft Academic Search

The nonorthogonal tight-binding method of Varma and Weber is used to calculate the phonon spectra of YS, LaS, and CeSe, which exhibit strong anomalies in the longitudinal-acoustic branch, especially near the L point, where it crosses the transverse ones. The latter feature is found to arise from metal-metal interactions, which have their origin in the predominantly metal-derived electronic energy bands

M. M. Steiner; H. Eschrig; R. Monnier

1992-01-01

242

Spatial and temporal variability in fire occurrence within the Las Bayas Forestry Reserve, Durango, Mexico  

Microsoft Academic Search

Patterns of fire occurrence within the Las Bayas Forestry Reserve, Mexico are analyzed in relation to variability in climate,\\u000a topography, and human land-use. Significantly more fires with shorter fire return intervals occurred from 1900 to 1950 than\\u000a from 1950 to 2001. However, the frequency of widespread fire years (25% filter) was unchanged over time, as widespread fires\\u000a were synchronized by

S. A. Drury; T. T. Veblen

2008-01-01

243

Sealing 304L to lithia-alumina-silica (LAS) glass-ceramics  

Microsoft Academic Search

The formation of a crack-free between 300 series stainless steel and a glass-ceramic is difficult owing to the high coefficients of thermal expansion of the stainless steels. Lithia-alumina-silica (LAS) glass-ceramics were successfully developed and sealed to 304L stainless steel. These crack-free seals were fabricated by two techniques: by adjusting the parent glass composition (reducing the AlâOâ content), or by adjusting

W. E. Moddeman; R. E. Pence; R. T. Massey; R. T. Cassidy; D. P. Kramer

1989-01-01

244

Probabilistic risk assessment for linear alkylbenzene sulfonate (LAS) in sewage sludge used on agricultural soil  

Microsoft Academic Search

Deterministic and probabilistic risk assessments were developed for commercial LAS in agricultural soil amended with sewage sludge. The procedure done according to ILSI Europe’s Conceptual Framework [Schowanek, D., Carr, R., David, H., Douben, P., Hall, J., Kirchmann, H., Patria, L., Sequi, P., Smith, S., Webb, S.F., 2004. A risk-based methodology for deriving quality standards for organic contaminants in sewage sludge

Diederik Schowanek; Helen David; Rosa Francaviglia; Jeremy Hall; Holger Kirchmann; Paul Henning Krogh; Nathalie Schraepen; Stephen Smith; Tanja Wildemann

2007-01-01

245

LA INFLUENCIA DE LAS POLÍTICAS DE RESPONSABILIDAD SOCIAL Y LA PERTENENCIA A REDES DE COOPERACIÓN EN EL CAPITAL RELACIONAL Y ESTRUCTURAL DE LAS MICROEMPRESAS \\/ THE INFLUENCE OF SOCIAL RESPONSIBILITY POLICIES AND BELONGING TO COOPERATION NETWORKS IN THE RELATIONAL AND STRUCTURAL CAPITAL OF MICRO-ENTERPRISES  

Microsoft Academic Search

Las microempresas presentan algunos atributos que las distinguen de las grandes empresas y de los que se derivan algunos inconvenientes a la hora de adoptar principios y políticas de responsabilidad social. Sin embargo, los principios de responsabilidad social pueden y deben integrarse en cualquier tipo de organización, incluida la microempresa. En este trabajo, se estudia cómo las redes de cooperación

Sonia Benito Hernández; Pablo Esteban Sánchez

2012-01-01

246

Quantifying multi-temporal urban development characteristics in Las Vegas from Landsat and ASTER data  

USGS Publications Warehouse

Urban development has expanded rapidly in Las Vegas, Nevada of the United States, over the last fifty years. A major environmental change associated with this urbanization trend is the transformation of the landscape from natural cover types to increasingly anthropogenic impervious surface. This research utilizes remote sensing data from both the Landsat and Terra-Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instruments in conjunction with digital orthophotography to estimate urban extent and its temporal changes by determining sub-pixel impervious surfaces. Percent impervious surface area has shown encouraging agreement with urban land extent and development density. Results indicate that total urban land-use increases approximately 110 percent from 1984 to 2002. Most of the increases are associated with medium-to high-density urban development. Places having significant increases in impervious surfaces are in the northwestern and southeastern parts of Las Vegas. Most high-density urban development, however, appears in central Las Vegas. Impervious surface conditions for 2002 measured from Landsat and ASTER satellite data are compared in terms of their accuracy. ?? 2008 American Society for Photogrammetry and Remote Sensing.

Xian, G.; Crane, M.; McMahon, C.

2008-01-01

247

Surficial geology and distribution of post-impoundment sediment in Las Vegas Bay, Lake Mead  

USGS Publications Warehouse

Sidescan sonar imagery and seismic-reflection profiles were collected in the northwestern part of Las Vegas Bay to map the distribution and volume of sediment that has accumulated in this part of Lake Mead since impoundment. The mapping suggests that three ephemeral streams are the primary source of this sediment, and of these, Las Vegas Wash is the largest. Two deltas off the mouth of Las Vegas Wash formed at different lake elevations and account for 41% of the total volume of post-impoundment sediment within the study area. Deltas off the other two washes (Gypsum and Government) account for only 6% of the total volume. The sediment beyond the front of the deltas is primarily mud, and it only occurs in valley floors, where it forms a flat-lying blanket that is mostly less than 1.5 m thick. Although a thin layer, the fine-grained sediment accounts for approximately 53% of the total post-impoundment sediment volume of 5.7 x 106 m3 that has accumulated in the study area. This sediment appears to have been transported several kilometers from the river sources by density flows.

Twichell, David C.; Cross, VeeAnn A.; Rudin, Mark J.; Parolski, Kenneth F.; Rendigs, Richard R.

2001-01-01

248

The vitamin riboflavin and its derivative lumichrome activate the LasR bacterial quorum-sensing receptor.  

PubMed

Many bacteria use quorum sensing (QS) as an intercellular signaling mechanism to regulate gene expression in local populations. Plant and algal hosts, in turn, secrete compounds that mimic bacterial QS signals, allowing these hosts to manipulate QS-regulated gene expression in bacteria. Lumichrome, a derivative of the vitamin riboflavin, was purified and chemically identified from culture filtrates of the alga Chlamydomonas as a QS signal-mimic compound capable of stimulating the Pseudomonas aeruginosa LasR QS receptor. LasR normally recognizes the N-acyl homoserine lactone (AHL) signal, N-3-oxo-dodecanoyl homoserine lactone. Authentic lumichrome and riboflavin stimulated the LasR receptor in bioassays and lumichrome activated LasR in gel shift experiments. Amino acid substitutions in LasR residues required for AHL binding altered responses to both AHLs and lumichrome or riboflavin. These results and docking studies indicate that the AHL binding pocket of LasR recognizes both AHLs and the structurally dissimilar lumichrome or riboflavin. Bacteria, plants, and algae commonly secrete riboflavin or lumichrome, raising the possibility that these compounds could serve as either QS signals or as interkingdom signal mimics capable of manipulating QS in bacteria with a LasR-like receptor. PMID:18700823

Rajamani, Sathish; Bauer, Wolfgang D; Robinson, Jayne B; Farrow, John M; Pesci, Everett C; Teplitski, Max; Gao, Mengsheng; Sayre, Richard T; Phillips, Donald A

2008-09-01

249

Growth phenotypes of Pseudomonas aeruginosa lasR mutants adapted to the airways of cystic fibrosis patients  

PubMed Central

Summary The opportunistic pathogen Pseudomonas aeruginosa undergoes genetic change during chronic airway infection of cystic fibrosis (CF) patients. One common change is a mutation inactivating lasR, which encodes a transcriptional regulator that responds to a homoserine lactone signal to activate expression of acute virulence factors. Colonies of lasR mutants visibly accumulated the iridescent intercellular signal 4-hydroxy-2-heptylquinoline. Using this colony phenotype, we identified P. aeruginosa lasR mutants that emerged in the airway of a CF patient early during chronic infection, and during growth in the laboratory on a rich medium. The lasR loss-of-function mutations in these strains conferred a growth advantage with particular carbon and nitrogen sources, including amino acids, in part due to increased expression of the catabolic pathway regulator CbrB. This growth phenotype could contribute to selection of lasR mutants both on rich medium and within the CF airway, supporting a key role for bacterial metabolic adaptation during chronic infection. Inactivation of lasR also resulted in increased ?-lactamase activity that increased tolerance to ceftazidime, a widely used ?-lactam antibiotic. Loss of LasR function may represent a marker of an early stage in chronic infection of the CF airway with clinical implications for antibiotic resistance and disease progression.

D'Argenio, David A.; Wu, Manhong; Hoffman, Lucas R.; Kulasekara, Hemantha D.; Deziel, Eric; Smith, Eric E.; Nguyen, Hai; Ernst, Robert K.; Larson Freeman, Theodore J.; Spencer, David H.; Brittnacher, Mitchell; Hayden, Hillary S.; Selgrade, Sara; Klausen, Mikkel; Goodlett, David R.; Burns, Jane L.; Ramsey, Bonnie W.; Miller, Samuel I.

2009-01-01

250

Distribution and origin of dissolved gases of groundwaters at Las Cañadas aquifer, Tenerife, Canary Islands  

NASA Astrophysics Data System (ADS)

Volcanic aquifers commonly trap an important fraction of the main soluble components of fluids released from volcanic-hydrothermal system (CO2, SO2, H2S, HCl, HF, etc.). In particular, the interactions between volcanic gases and volcanic aquifers have been studied through hydrogeochemical parameters, as major and minor ions contents and dissolved gases in groundwaters. In the context of hydrogeochemical studies applied to active volcanic areas, studies of dissolved gases species in groundwater could be a useful tool to better understand the subsurface processes as gas-water-rock interaction or to strengthen the geochemical seismic-volcanic surveillance programs. In this work, we report the results of the geochemical characterization of dissolved gases (N2, O2, Ar, CO2, CH4, CO, H2, He, 222Rn, ?13CTDIC) in 96 groundwater samples from Las Cañadas aquifer (around Teide volcano) between May and October, 2006. The main aims of this work are: (1) to determine the background level of magmatic gas input in the aquifer during quiescent periods, (2) to better define the origin of dissolved gases in Las Cañadas aquifer, specially CO2, (3) to evaluate the gas-water-rock interaction processes occurring at depth, and (4) to delineate high permeable pathway of upward migration of volcanic-hydrothermal gases. In general, the dissolved gas phase in groundwaters of Las Cañadas aquifer is relatively enriched in endogenous gases (CO2, He and H2) while it is relatively depleted in atmospheric gases (N2, O2 and Ar). N2-O2-CO2 triangular diagram shows that dissolved gases in most of analyzed groundwater are variable mixtures of CO2-rich fluids from the volcanic-hydrothermal system (as represent the Teide fumaroles) with dissolved air. The relatively high N2/O2 ratio in some groundwater compared to the air saturated water suggests an O2 consumption during gas-water-rock interactions occurring at depth. Spatial distribution maps show anomalous concentration of 222Rn CH4, H2 and CO2 dissolved in groundwater at the westernmost area of Las Cañadas aquifer, which is in good spatial correlation with geophysical and geochemical anomalies related to 2004-2005 seismic-volcanic unrest at Tenerife Island. Determinations of ?13C values in the total dissolved inorganic carbon (TDIC) in groundwater in Las Cañadas aquifer ranging from -5 to +5 (‰ vs PDB). This result was explained by isotopic fractionation of either volcanic-hydrothermal CO2 partially dissolved in groundwater or due to precipitation of CaCO3 and CO2 degassing related to silicate hydrolysis dissolving Ca2+.

Marrero, R.; Melian, G.; Padron, E.; Sortino, F.; Hernandez Perez, P. A.; Lopez, D. L.; Perez, N.

2009-12-01

251

Fluid-rock interaction at Las Cañadas aquifer, Tenerife, Canary Islands  

NASA Astrophysics Data System (ADS)

Las Cañadas caldera, located at the central part of Tenerife, Canary Islands, is a large volcanic depression (16 x 9 km). The caldera is opened to the sea at the north side and filled by continuous layers of lava flows and fall deposits. These volcanic deposits form a good hydrogeological trap which is the largest ground water reserve of the island. In comparison, the basement of the caldera has low permeability. Numerous galleries (horizontal drains) intercept the Las Cañadas aquifer. During the last century, this aquifer has been overexploited depleting the water table as well as the water quality. The Teide-Pico Viejo volcanic complex is located at the margin of the caldera. The ascent of deep magmatic gases (e.g. CO2) confers aggressiveness to the waters causing rock dissolution and alteration. The aim of this work is to study water-rock interactions in Las Cañadas aquifer. Chemical diagrams showing the relative composition of Mg, Ca, Na and K as described by Giggenbach (1988) indicate that the waters discharged by the galleries correspond to the process of rock dissolution and evolution towards full rock-fluid equilibrium. The lower contents in Ca and Mg are found in the galleries which reach more deeply the north flank of the Teide Volcano, suggesting mineral precipitation and heating in this zone. Geochemical modeling of fluid-rock interactions using Chiller (Reed and Spycher, 1984) show that the gases discharged at Teide summit cannot generate the water compositions observed at Las Cañadas. These gases represent the separated phase of a condensation process within the volcanic edifice. Modeling of the gas-enriched Las Cañadas waters from the recharge zone with phonolitic rocks from the caldera show that the galleries waters correspond to the dissolution of 1 to 7 g of rock/liter of water and a relatively shallow circulation. The simulations suggest that waters have not encountered the ˜ 250° C temperature region suggested by the gas geothermometers. This behavior suggests that the heat source in this system is deep as suggested by geophysical studies.

Marrero, R.; López, D.; Pérez, N.

2003-12-01

252

An Aerial Radiological Survey of Selected Areas of the City of North Las Vegas  

SciTech Connect

As part of the proficiency training for the Radiological Mapping mission of the Aerial Measuring System (AMS), a survey team from the Remote Sensing Laboratory-Nellis (RSL-Nellis) conducted an aerial radiological survey of selected areas of the city of North Las Vegas for the purpose of mapping natural radiation background and locating any man-made radioactive sources. Survey areas were selected in collaboration with the City Manager's office and included four separate areas: (1) Las Vegas Motor Speedway (10.6 square miles); (2) North Las Vegas Downtown Area (9.2 square miles); (3) I-15 Industrial Corridor (7.4 square miles); and (4) Future site of University of Nevada Las Vegas campus (17.4 square miles). The survey was conducted in three phases: Phase 1 on December 11-12, 2007 (Areas 1 and 2), Phase 2 on February 28, 2008 (Area 3), and Phase 3 on March 19, 2008 (Area 4). The total completed survey covered a total of 44.6 square miles. The flight lines (without the turns) over the surveyed areas are presented in Figures 1, 2, 3, and 4. A total of eight 2.5-hour-long flights were performed at an altitude of 150 ft above ground level (AGL) with 300 feet of flight-line spacing. Water line and test line flights were conducted over the Lake Mead and Government Wash areas to ensure quality control of the data. The data were collected by the AMS data acquisition system (REDAR V) using an array of twelve 2-inch x 4-inch x 16-inch sodium iodide (NaI) detectors flown on-board a twin-engine Bell 412 helicopter. Data, in the form of gamma energy spectra, were collected continually (every second) over the course of the survey and were geo-referenced using a differential Global Positioning System. Collection of spectral data allows the system to distinguish between ordinary fluctuations in natural background radiation levels and the signature produced by man-made radioisotopes. Spectral data can also be used to identify specific radioactive isotopes. As a courtesy service, with the approval of the U.S. Department of Energy, National Nuclear Security Administration, Nevada Site Office, RSL-Nellis is providing this summary to the office of the Mayor of the City of North Las Vegas along with the gross-count-based exposure rate and man-made count contour maps and GIS shape files in electronic format on a compact disk.

Piotr Wasiolek

2008-06-01

253

Las Positas College Increase Female Students in Welding and Automotive Technology from 5% to 14%; Retention Increases to 94%  

NSDL National Science Digital Library

This brief case study highlights Las Positas College in Livermore, California, which took part in the CalWomen Tech project. The project involved each college participating in four core recruitment strategies. Outreach took form in the place of posters, flyers, brochures and a website. Las Positas used the slogan "Women in Technology RULE." As a result of these efforts, the college was able to increase recruitment and retention of female students. The lessons learned from Las Positas College would be useful for other community colleges and technical programs looking to improve in this area.

2012-01-30

254

New sample treatment for determination of linear alkylbenzene sulfonate (LAS) in agricultural soils by liquid chromatography with fluorescence detection  

Microsoft Academic Search

A new sample-treatment procedure has been developed for determination of total linear alkylbenzene sulfonate (LAS), i.e. homologues\\u000a and isomers, in agricultural soil. The procedure involves two steps, ultrasound-assisted extraction of LAS from the samples\\u000a with methanol then clean-up of the methanolic extracts and preconcentration of the LAS by solid-phase extraction on two adsorbent\\u000a cartridges (SAX and C18). The ultrasound-assisted procedure

M. Nimer; O. Ballesteros; A. Navalón; G. Crovetto; C. Verge; I. López; J. L. Berna; J. L. Vílchez

2007-01-01

255

Investigaccion-accion en la sala de clases sobre las creencias de la cultura de la ciencia de un grupo de estudiantes universitarios y su relacion reciproca con el aprendizaje de las ciencias biologicas  

NASA Astrophysics Data System (ADS)

La investigacion---accion que se llevo a cabo en la sala de clases tenia como punto de partida las creencias de la cultura de la ciencia de un grupo de estudiantes universitarios para luego examinar sus implicaciones en el proceso de aprendizaje de las Ciencias Biologicas. ¿Que se supone que hagan las creencias en relacion con el aprendizaje? ¿En que consiste incorporar este aspecto a la practica educativa universitaria? Utilizando el modelo de Kemmis y McTaggart (1987) la investigacion-accion se planteo como un proceso dinamico en cuatro momentos en espiral constituidos por la planificacion, la accion, la observacion y la reflexion. Cada una de las fases tuvo una intencion retrospectiva y prospectiva formando una espiral de autorreflexion del conocimiento y la accion. Se llevaron a cabo audio grabaciones en clases y analisis de documentos. Ademas, la profesora-investigadora hizo un portafolio para reflexionar sobre las creencias de la cultura de la ciencia que tienen los estudiantes y las creencias del aprendizaje que tiene la profesora y sobre como la comprension de estos elementos ayudo a mejorar su practica educativa a traves del tiempo. Los resultados obtenidos apuntan a que las creencias de la cultura de la ciencia que tiene el grupo de estudiantes son diversas. Ellos si creen que la ciencia tiene una cultura la cual describieron como: complicada y desconocida que evoluciona constantemente, que es un conjunto de metodos, que es altamente tecnologica, que resuelve problemas de salud, ayuda a interpretar la realidad del mundo que los rodea y su origen y que existen unas intersecciones entre la ciencia y el poder. Sobre las creencias del proceso de aprendizaje de la profesora-investigadora, estas senalan que el modelaje de actores, la vision de la academia que tiene ella asi como la participacion y negociacion entre todos los involucrados en el proceso educativo, son factores que inciden en el proceso de aprendizaje.

Cordova-Santiago, Lizzette Astrid

256

LAS FLECHAS EN EL ARTE LEVANTINO: APORTACIONES DESDE EL ANÁLISIS DE LOS PROYECTILES DEL REGISTRO ARQUEOLÓGICO DEL RIU DE LES COVES (ALT MAESTRAT, CASTELLÓ )  

Microsoft Academic Search

RESUMEN: En el presente trabajo se aborda el estudio de las flechas en el Arte Levantino a partir de su contrastación con los proyectiles en piedra tallada recuperados en los yacimientos meso- líticos y neolíticos más próximos a los abrigos pintados del núcleo de la Valltorta-Gasulla. El aná- lisis de las diferentes modalidades de representación y las distintas propuestas de

Javier FERNÁNDEZ LÓPEZ DE PABLO

257

Un acercamiento a la aplicación de la teoría de las inteligencias múltiples (IM) en la clase de inglés como idioma extranjero en el contexto universitario cubano  

Microsoft Academic Search

El desarrollo de habilidades relacionadas con el discurso oral es una de las prioridades de los estudiantes de lenguas extranjeras. La mayoría de las veces, la destreza en la comunicación verbal es lo que mide el conocimiento del alumno de la lengua extranjera (LE) o la segunda lengua (L2) que se está aprendiendo. Hay muchas razones por lo que las

Daniel Cima de Mesa; Adrian Abreus González

2011-01-01

258

De las capacidades dinámicas como enfoque de la estrategia a la integración de competencias para la construcción de un entorno colaborativo Univ - Emp  

Microsoft Academic Search

Este artículo intenta mostrar la importancia de avanzar de un enfoque de capacidades dinámicas a uno de competencias, para construir una estrategia de entornos colaborativos que permita aprovechar los esfuerzos y las oportunidades de la relación universidad- empresa. Para tal fin, el documento está organizado en tres partes: la primera, es una revisión amplia de las perspectivas desde las cuales

Patricia Roncancio R

2011-01-01

259

La promoción turística oficial en Internet y su relación con el desarrollo turístico de los destinos: Una aplicación a las Ciudades medias de Andalucía  

Microsoft Academic Search

Resumen: Este trabajo analiza las webs de promoción oficial de destinos turísticos de interior de Andalucía. En el mismo se confirma la existencia de una relación entre el desarrollo turístico y el nivel de desarrollo de las webs. El estudio aporta una metodología basada en la contabilización de elemento (“counting methods”), obteniendo como resultado un estudio descriptivo de las webs

Pablo Díaz Luque; Blanca López Catalán

2012-01-01

260

76 FR 3678 - Board Meeting: February 16, 2011-Las Vegas, NV, the U.S. Nuclear Waste Technical Review Board...  

Federal Register 2010, 2011, 2012, 2013

...NUCLEAR WASTE TECHNICAL REVIEW BOARD Board Meeting...Las Vegas, NV, the U.S. Nuclear Waste Technical Review Board Will Meet To Discuss...Nuclear Fuel and High-Level Radioactive Waste Pursuant to its authority under...

2011-01-20

261

75 FR 60496 - Kern Valley Railroad Company-Termination of Trackage Rights-in Las Animas County, CO  

Federal Register 2010, 2011, 2012, 2013

...TRANSPORTATION Surface Transportation Board [Docket No. AB 1069X] Kern Valley Railroad Company--Termination of Trackage Rights--in Las Animas County, CO On September 10, 2010, Kern Valley Railroad Company (KVR) filed with the Board a...

2010-09-30

262

Invasive Species Databases: Proceedings of a Workshop. Held in Las Vegas, Nevada on November 12-13, 1998.  

National Technical Information Service (NTIS)

The workshop, which was held in Las Vegas, Nevada, on November 12-13, 1998, in association with the American Phytopathological Society and Entomological Society of America, served as the basis for these proceedings. The introductory section for these proc...

R. L. Ridgway W. P. Gregg R. E. Stinner A. G. Brown

1999-01-01

263

An Aerial Radiological Survey of the City of North Las Vegas (Downtown) and the Motor Speedway  

SciTech Connect

As part of the proficiency training for the Radiological Mapping mission of the Aerial Measuring System (AMS), a survey team from the Remote Sensing Laboratory-Nellis (RSL-Nellis) conducted an aerial radiological survey on December 11-12, 2007, with the purpose of mapping natural radiation background and locating any man-made radioactive sources. The survey covered 19.4 square miles (9.2 square miles over the downtown area of the City of North Las Vegas and 10.2 square miles over the Las Vegas Motor Speedway [LVMS]). The flight lines over the surveyed areas are presented in Figures 1 and 2. A total of four 2.5-hour-long flights were performed at an altitude of 150 ft above ground level (AGL) with 300 ft of flight line spacing. Water line and test line flights were conducted over the Lake Mead and Government Wash areas to ensure quality control of the data. The data were collected by the AMS data acquisition system-REDAR V using an array of twelve 2-inch x 4-inch x 16-inch sodium iodide (NaI) detectors flown on-board a twin-engine Bell 412 helicopter. Data in the form of gamma energy spectra were collected continually (every second) over the course of the survey and were geo-referenced using a differential Global Positioning System. Collection of spectral data allows the system to distinguish between ordinary fluctuations in natural background radiation levels and the signature produced by man-made radioisotopes sources. Spectral data can also be used to identify specific radioactive isotopes. As a courtesy service with the approval of the U.S. Department of Energy, National Nuclear Security Administration, Nevada Site Office, RSL-Nellis is providing this summary to the office of the Mayor of City of North Las Vegas and LVMS security along with the gross counts-based exposure rate and man-made counts maps.

Piotr Wasiolek

2007-12-01

264

The Impacts of Reactive Terpene Emissions From Plants on the Air Quality of Las Vegas, Nevada  

NASA Astrophysics Data System (ADS)

Biogenic volatile organic compounds (BVOCs) emitted from vegetation can significantly impact tropospheric air quality by interacting with anthropogenic pollutants, such as oxides of nitrogen (NOx), to produce ozone and particulate matter (PM) in the form of secondary organic aerosols (SOA). Two classes of BVOCs, isoprene and monoterpenes, have been well characterized and, until recently, were thought to be the most prevalent BVOCs emitted. However, recent studies suggest that a class of very reactive BVOCs (VR-BVOCs) is emitted at rates which exceed those of monoterpenes (Goldstein et al. 2004). The chemistry of VR-BVOCs is complicated as these high molecular weight compounds have multiple reaction centers, complex structures, and are difficult to measure due to very low volatilities and rapid reaction rates. As a result of this difficulty, very little is known about VR-BVOC emissions and their concomitant effects on air quality. The present study examines emissions of VR-BVOCs, principally sesquiterpenes, from the dominant native and non-native vegetation in the Las Vegas metropolitan area. Measurements were obtained using a novel collection system involving a gas chromatograph and a custom-designed glass leaf chamber. In order to minimize losses due to the high reactivity and low vapor pressures of these compounds, the instrument system was field-portable, had very short transfer lines, and was made of inert materials (glass, Teflon). These data have been entered into a GIS framework to develop an emissions inventory for the Las Vegas metropolitan area. A series of atmospheric chemistry box model simulations utilizing the RACM2 chemical mechanism were run to assess impacts of sesquiterpenes on air quality for urban, suburban, and rural areas. Studying the magnitude of emissions of this class of BVOCs provides a more thorough understanding of the factors contributing to ozone concentrations and SOA formation. This information is of increasing importance as the Las Vegas area continues to expand at a rapid pace and local planners search for ways to mitigate air quality problems.

Papiez, M. R.; Potosnak, M. J.; Goliff, W. S.

2006-12-01

265

Interferograms showing land subsidence and uplift in Las Vegas Valley, Nevada, 1992-99  

USGS Publications Warehouse

The U.S. Geological Survey, in cooperation with the Nevada Department of Conservation and Natural Resources-Division of Water Resources and the Las Vegas Valley Water District, compiled 44 individual interferograms and 1 stacked interferogram comprising 29 satellite synthetic aperture radar acquisitions of Las Vegas Valley, Nevada, from 1992 to 1999. The interferograms, which depict short-term, seasonal, and long-term trends in land subsidence and uplift, are viewable with an interactive map. The interferograms show that land subsidence and uplift generally occur in localized areas, are responsive to ground-water pumpage and artificial recharge, and, in part, are fault controlled. Information from these interferograms can be used by water and land managers to mitigate land subsidence and associated damage. Land subsidence attributed to ground-water pumpage has been documented in Las Vegas Valley since the 1940s. Damage to roads, buildings, and other engineered structures has been associated with this land subsidence. Land uplift attributed to artificial recharge and reduced pumping has been documented since the 1990s. Measuring these land-surface changes with traditional benchmark and Global Positioning System surveys can be costly and time consuming, and results typically are spatially and temporally sparse. Interferograms are relatively inexpensive and provide temporal and spatial resolutions previously not achievable. The interferograms are viewable with an interactive map. Landsat images from 1993 and 2000 are viewable for frames of reference to locate areas of interest and help determine land use. A stacked interferogram for 1992-99 is viewable to visualize the cumulative vertical displacement for the period represented by the individual interferograms. The interactive map enables users to identify and estimate the magnitude of vertical displacement, visually analyze deformation trends, and view interferograms and Landsat images side by side. The interferograms and Landsat images are available for download, in formats for use with Geographic Information System software.

Pavelko, Michael T.; Hoffmann, Jorn; Damar, Nancy A.

2006-01-01

266

Influence of linear alkylbenzene sulfonate (LAS) on the structure of Alphaproteobacteria , Actinobacteria , and Acidobacteria communities in a soil microcosm  

Microsoft Academic Search

Background, aim, and scope  Linear alkylbenzene sulfonate (LAS) is the most used anionic surfactant in a worldwide scale and is considered a high-priority\\u000a pollutant. LAS is regarded as a readily biodegradable product under aerobic conditions in aqueous media and is mostly removed\\u000a in wastewater treatment plants, but an important fraction (20–25%) is immobilized in sewage sludge and persists under anoxic\\u000a conditions.

Jesús González-López; Clementina Pozo; Belén Rodelas

2010-01-01

267

Linear alkylbenzene sulfonate (LAS) in water of Lake Dianchi—spatial and seasonal variation, and kinetics of biodegradation  

Microsoft Academic Search

For the purpose of elucidating the environmental characteristics of anion surfactants [linear alkylbenzene sulfonates (LAS)]\\u000a in the water of Lake Dianchi, a sampling investigation in the field from October 2006 to July 2007 and a batch of biodegradation\\u000a experiments in the laboratory were carried out. The results showed that concentrations of LAS ranged from 18.6 to 260.1 ?g L???1, and the average

Zhi Wang; Bangding Xiao; Xingqiang Wu; Xinhai Tu; Yingcai Wang; Xiaolei Sun; Lirong Song

2010-01-01

268

Seismic Data for Evaluation of Ground Motion Hazards in Las Vegas in Support of Test Site Readiness Ground Motion  

SciTech Connect

In this report we describe the data sets used to evaluate ground motion hazards in Las Vegas from nuclear tests at the Nevada Test Site. This analysis is presented in Rodgers et al. (2005, 2006) and includes 13 nuclear explosions recorded at the John Blume and Associates network, the Little Skull Mountain earthquake and a temporary deployment of broadband station in Las Vegas. The data are available in SAC format on CD-ROM as an appendix to this report.

Rodgers, A

2008-01-16

269

Management and operating contractors' support services at McCarran International Airport, Las Vegas, Nevada  

SciTech Connect

This audit evaluated the Department of Energy's (Department) oversight of Lawrence Livermore, Los Alamos, and Sandia National Laboratories' need for support services at McCarran International Airport (McCarran), Las Vegas, Nevada. An examination followed generally accepted Government auditing standards for performance audits, included tests of internal controls, and compliance with laws and regulations necessary to satisfy the audits objective. Since this review was limited, it would not necessarily disclose all material internal control weaknesses. However, the finding relating to duplicate services and a lack of annual real property surveys showed internal control weaknesses. These should be considered when preparing the year-end assurance memorandum on internal control deficiencies.

Not Available

1989-08-09

270

First results from optical turbulence measurements at Cerro Las Campanas in 2010  

NASA Astrophysics Data System (ADS)

We report preliminary results from optical turbulence measurements carried out in 2010 at Cerro Las Campanas, the future site for the Giant Magellan Telescope (GMT). The instruments involved are MooSci, a lunar scintillometer for the near-ground optical turbulence profile, Differential Image Motion Monitor (DIMM) for the whole atmosphere total seeing, and MASS Multiple Aperture Scintillation Sensor (MASS) for high-altitude optical turbulence estimation. The main purpose of these measurements is to anticipate the optical turbulence strength above the future GMT enclosure, and to provide a means to model the future adaptive optics performance. We also discuss the significance of such a combination of instruments and some hypothetical limitations.

Berdja, A.; Prieto, G.; Thomas-Osip, J. E.

2011-09-01

271

Anaerobic degradation of linear alkylbenzene sulfonate (LAS) in fluidized bed reactor by microbial consortia in different support materials.  

PubMed

Four anaerobic fluidized bed reactors filled with activated carbon (R1), expanded clay (R2), glass beads (R3) and sand (R4) were tested for anaerobic degradation of LAS. All reactors were inoculated with sludge from a UASB reactor treating swine wastewater and were fed with a synthetic substrate supplemented with approximately 20 mg l(-1) of LAS, on average. To 560 mg l(-1) COD influent, the maximum COD and LAS removal efficiencies were mean values of 97+/-2% and 99+/-2%, respectively, to all reactors demonstrating the potential applicability of this reactor configuration for treating LAS. The reactors were kept at 30 degrees C and operated with a hydraulic retention time (HRT) of 18h. The use of glass beads and sand appear attractive because they favor the development of biofilms capable of supporting LAS degradation. Subsequent 16S rRNA gene sequencing and phylogenetic analysis of samples from reactors R3 and R4 revealed that these reactors gave rise to broad microbial diversity, with microorganisms belonging to the phyla Bacteroidetes, Firmicutes, Actinobacteria and Proteobacteria, indicating the role of microbial consortia in degrading the surfactant LAS. PMID:20189800

de Oliveira, Lorena Lima; Costa, Rachel Biancalana; Okada, Dagoberto Yukio; Vich, Daniele Vital; Duarte, Iolanda Cristina Silveira; Silva, Edson Luiz; Varesche, Maria Bernadete Amâncio

2010-03-01

272

New sample treatment for determination of linear alkylbenzene sulfonate (LAS) in agricultural soils by liquid chromatography with fluorescence detection.  

PubMed

A new sample-treatment procedure has been developed for determination of total linear alkylbenzene sulfonate (LAS), i.e. homologues and isomers, in agricultural soil. The procedure involves two steps, ultrasound-assisted extraction of LAS from the samples with methanol then clean-up of the methanolic extracts and preconcentration of the LAS by solid-phase extraction on two adsorbent cartridges (SAX and C18). The ultrasound-assisted procedure reduces extraction time (10 min in contrast with 6-12 h for conventional Soxhlet extraction) and requires only small volumes of organic solvent. The effect of different variables interacting in the ultrasound-assisted extraction process was studied. Finally, separation and quantification of the homologues and isomers of LAS was performed by liquid chromatography with fluorescence detection (LC-FD). 2-Octylbenzenesulfonic acid sodium salt (Na-2ØC8-LAS) was used as internal standard. The proposed method was satisfactorily used for determination of LAS in agricultural soil samples from the fertile plain of Granada (Spain). PMID:17225109

Nimer, M; Ballesteros, O; Navalón, A; Crovetto, G; Verge, C; López, I; Berna, J L; Vílchez, J L

2007-01-16

273

On an LAS-integrated soft PLC system based on WorldFIP fieldbus.  

PubMed

Communication efficiency is lowered and real-time performance is not good enough in discrete control based on traditional WorldFIP field intelligent nodes in case that the scale of control in field is large. A soft PLC system based on WorldFIP fieldbus was designed and implemented. Link Activity Scheduler (LAS) was integrated into the system and field intelligent I/O modules acted as networked basic nodes. Discrete control logic was implemented with the LAS-integrated soft PLC system. The proposed system was composed of configuration and supervisory sub-systems and running sub-systems. The configuration and supervisory sub-system was implemented with a personal computer or an industrial personal computer; running subsystems were designed and implemented based on embedded hardware and software systems. Communication and schedule in the running subsystem was implemented with an embedded sub-module; discrete control and system self-diagnosis were implemented with another embedded sub-module. Structure of the proposed system was presented. Methodology for the design of the sub-systems was expounded. Experiments were carried out to evaluate the performance of the proposed system both in discrete and process control by investigating the effect of network data transmission delay induced by the soft PLC in WorldFIP network and CPU workload on resulting control performances. The experimental observations indicated that the proposed system is practically applicable. PMID:21889140

Liang, Geng; Li, Zhijun; Li, Wen; Bai, Yan

2011-09-01

274

Excess air during aquifer storage and recovery in an arid basin (Las Vegas Valley, USA)  

NASA Astrophysics Data System (ADS)

The Las Vegas Valley Water District in Nevada, USA, has operated an artificial recharge (AR) program since 1989. In summer 2001, observations of gas exsolving from tap water prompted a study that revealed total dissolved gas (TDG) pressures approaching 2 atm with a gas composition that it is predominantly air. Measurements of TDG pressure at well heads and in the distribution system indicated two potential mechanisms for elevated TDG pressures: (1) air entrainment during AR operations, and (2) temperature changes between the winter recharge season and the summer withdrawal season. Air entrainment during pumping was investigated by intentionally allowing the forebay (upstream reservoir) of a large pumping station to drawdown to the point of vortex formation. This resulted in up to a 0.7 atm increase in TDG pressure. In general, the solubility of gases in water decreases as the temperature increases. In the Las Vegas Valley, water that acquired a modest amount of dissolved gas during winter artificial recharge operations experienced an increase in dissolved gas pressure (0.04 atm/°C) as the water warmed in the subsurface. A combination of air entrainment during AR operations and its amplification by temperature increase after recharge can account for most of the observed amounts of excess gas at this site.

Solomon, D. Kip; Cole, Erin; Leising, Joseph F.

2011-02-01

275

Giant Magellan Telescope Site Testing and Characterization at Las Campanas Observatory  

NASA Astrophysics Data System (ADS)

Las Campanas Observatory has been designated as the location for the Giant Magellan Telescope (GMT). We report results obtained since the commencement, in 2005, of a systematic site testing campaign at LCO. Measurements of the turbulence profile of the free-atmosphere above LCO have been collected with a MASS/DIMM. We examine the contribution to the seeing arising from turbulence in the ground layer (defined here as below an altitude of 500 m) through the difference between the turbulence integrals in the full atmosphere (as measured by DIMM) and in the free atmosphere (as measured by MASS). In preparation to characterize the Giant Magellan Telescope site and guide the development of its adaptive optics system, two campaigns to systematically compare the turbulence profiles obtained independently with three different instruments were conducted at Las Campanas Observatory in September, 2007 and January 2008. Slope detection and ranging (SLODAR) was used on the 2.5-m duPont telescope. SLODAR measures the Cn2 profile as a function of altitude through observations of double stars. The separation of the observed double star sets the maximum altitude and height resolution. Ground layer (altitudes < 1 km) and free atmosphere turbulence profiles are compared with those obtained with a lunar scintillometer (LuSci) and a multi-aperture scintillation sensor (MASS), respectively. In addition, the total atmospheric seeing was measured by both SLODAR and a differential image motion monitor (DIMM).

Thomas-Osip, Joanna E.; Prieto, Gabriel E.

2009-09-01

276

Seasonal subsidence and rebound in Las Vegas Valley, Nevada, observed by synthetic aperture radar interferometry  

USGS Publications Warehouse

Analyses of areal variations in the subsidence and rebound occurring over stressed aquifer systems, in conjunction with measurements of the hydraulic head fluctuations causing these displacements, can yield valuable information about the compressibility and storage properties of the aquifer system. Historically, stress-strain relationships have been derived from paired extensometer/piezometer installations, which provide only point source data. Because of the general unavailability of spatially detailed deformation data, areal stress-strain relations and their variability are not commonly considered in constraining conceptual and numerical models of aquifer systems. Interferometric synthetic aperture radar (InSAR) techniques can map ground displacements at a spatial scale of tens of meters over 100 km wide swaths. InSAR has been used previously to characterize larger magnitude, generally permanent aquifer system compaction and land subsidence at yearly and longer timescales, caused by sustained drawdown of ground-water levels that produces intergranular stresses consistently greater than the maximum historical stress. We present InSAR measurements of the typically small-magnitude, generally recoverable deformations of the Las Vegas Valley aquifer system occurring at seasonal timescales. From these we derive estimates of the elastic storage coefficient for the aquifer system at several locations in Las Vegas Valley. These high-resolution measurements offer great potential for future investigations into the mechanics of aquifer systems and the spatial heterogeneity of aquifer system structure and material properties as well as for monitoring ongoing aquifer system compaction and land subsidence.

Hoffmann, J.; Zebker, H. A.; Galloway, D. L.; Amelung, F.

2001-01-01

277

The Saccharomyces cerevisiae Homologue of Human Wiskott-Aldrich Syndrome Protein Las17p Interacts with the Arp2/3 Complex  

PubMed Central

Yeast Las17 protein is homologous to the Wiskott–Aldrich Syndrome protein, which is implicated in severe immunodeficiency. Las17p/Bee1p has been shown to be important for actin patch assembly and actin polymerization. Here we show that Las17p interacts with the Arp2/3 complex. LAS17 is an allele-specific multicopy suppressor of ARP2 and ARP3 mutations; overexpression restores both actin patch organization and endocytosis defects in ARP2 temperature-sensitive (ts) cells. Six of seven ARP2 ts mutants and at least one ARP3 ts mutant are synthetically lethal with las17? ts confirming functional interaction with the Arp2/3 complex. Further characterization of las17? cells showed that receptor-mediated internalization of ? factor by the Ste2 receptor is severely defective. The polarity of normal bipolar bud site selection is lost. Las17-gfp remains localized in cortical patches in vivo independently of polymerized actin and is required for the polarized localization of Arp2/3 as well as actin. Coimmunoprecipitation of Arp2p with Las17p indicates that Las17p interacts directly with the complex. Two hybrid results also suggest that Las17p interacts with actin, verprolin, Rvs167p and several other proteins including Src homology 3 (SH3) domain proteins, suggesting that Las17p may integrate signals from different regulatory cascades destined for the Arp2/3p complex and the actin cytoskeleton.

Madania, Ammar; Dumoulin, Pascal; Grava, Sandrine; Kitamoto, Hiroko; Scharer-Brodbeck, Claudia; Soulard, Alexandre; Moreau, Violaine; Winsor, Barbara

1999-01-01

278

Crystal Structure of the LasA Virulence Factor from Pseudomonas aeruginosa: Substrate Specificity and Mechanism of M23 Metallopeptidases  

SciTech Connect

Pseudomonas aeruginosa is an opportunist Gram-negative bacterial pathogen responsible for a wide range of infections in immunocompromized individuals and is a leading cause of mortality in cystic fibrosis patients. A number of secreted virulence factors, including various proteolytic enzymes, contribute to the establishment and maintenance of Pseudomonas infection. One such is LasA, an M23 metallopeptidase related to autolytic glycylglycine endopeptidases such as Staphylococcus aureus lysostaphin and LytM, and to DD-endopeptidases involved in entry of bacteriophage to host bacteria. LasA is implicated in a range of processes related to Pseudomonas virulence, including stimulating ectodomain shedding of the cell surface heparan sulphate proteoglycan syndecan-1 and elastin degradation in connective tissue. Here we present crystal structures of active LasA as a complex with tartrate and in the uncomplexed form. While the overall fold resembles that of the other M23 family members, the LasA active site is less constricted and utilizes a different set of metal ligands. The active site of uncomplexed LasA contains a five-coordinate zinc ion with trigonal bipyramidal geometry and two metal-bound water molecules. Using these structures as a starting point, we propose a model for substrate binding by LasA that explains its activity against a wider range of substrates than those used by related lytic enzymes, and offer a catalytic mechanism for M23 metallopeptidases consistent with available structural and mutagenesis data. Our results highlight how LasA is a structurally distinct member of this endopeptidase family, consistent with its activity against a wider range of substrates and with its multiple roles in Pseudomonas virulence.

Spencer, James; Murphy, Loretta M.; Conners, Rebecca; Sessions, Richard B.; Gamblin, Steven J. (Wales); (Bristol Med Sci); (NIMR)

2010-09-21

279

Aerosol Optical Properties of Smoke from the Las Conchas Wildfire, Los Alamos, NM  

NASA Astrophysics Data System (ADS)

The Las Conchas wildfire in Northern New Mexico started on June, 26 2011 and spread rapidly, eventually burning an area of 634 km2 (245 mi2). Due to the close proximity to the fire, the Los Alamos National Laboratory (LANL) was shut down and the town evacuated for several days. Immediately after LANL reopened (7/6/2011) the Earth and Environmental Sciences Division (EES-14) attained unique measurements of the smoke by sampling the ambient air. Three Integrated Photoacoustic/Nephelometer Spectrometers (DMT Inc.) were set up to measure aerosol light absorption and scattering coefficients. A University of Northwest Switzerland thermodenuder was used to remove compounds that are volatile at temperatures up to 200C. The aerosol's optical properties were measured before and after denuding the sample at 405nm (blue), 532nm (green), 781nm (red), and for non-denuded particles also at 375nm (ultraviolet). The aerosol size distributions were measured after the denuder with a Laser Aerosol Spectrometer (LAS, TSI Inc.) and black carbon was measured with a Single Particle Soot Photometer (SP2, DMT Inc.). Additionally, ambient measurements of Total Particulate Matter (PM2.5 and PM10) were collected continuously at the LANL air monitoring stations. These measurements are used in conjunction with numerical simulations to determine the bulk optical properties of the aerosol. Aerosols in wildfire smoke are composed of organic and black carbon (soot) particles that are formed during wood combustion and pyrolysis. The optical properties of the smoke particles are complex and lead to large uncertainties in assessing the global climate. During the measurement period, the Las Conchas fire provided very high particle concentrations (up to 200 ?g/m3) that were exploited to investigate their optical properties. By heating the particles to temperatures ranging from 75 to 200C in the denuder, volatile organics were removed and the optical properties of the remaining particles were measured. Denuding of the aerosols, removed the outer organic coatings leaving behind the inner core of black carbon (soot) and any compounds that did not volatize completely. By simultaneously measuring the optical properties of the non-denuded as well as the denuded aerosol, we can study how the coatings affect the optical properties. The absorption coefficient measurements showed that coatings can cause an increase or decrease in absorption. The photoacoustic measurements were also combined with SP2 measurements to gain a mechanistic understanding of the effect of composition on the mass light absorption cross-sections of carbonaceous aerosols emitted by fires.

Gorkowski, K.; Dubey, M. K.; Flowers, B. A.; Aiken, A. C.; Klein, B. Z.; Mazzoleni, C.; Sharma, N.; China`, S.

2011-12-01

280

Seguridad alimentaria para futuras mamás: Profesionales de ...  

Center for Food Safety and Applied Nutrition (CFSAN)

... “¡Necesito que mi médico me brinde información sobre seguridad alimentaria!” Esto es lo que han dicho las mujeres embarazadas durante las ... More results from www.fda.gov/food/foodborneillnesscontaminants/peopleatrisk

281

Effect of linear alkylbenzene sulfonate (LAS) on ion transport and intracellular calcium in kidney distal epithelial cells (A6).  

PubMed

Linear alkylbenzene sulfonate (LAS) is found in near-shore environments receiving wastewater from urban treatment plants in a concentration reported to have physiological and toxic effect on aquatic organisms. The aim of this study was to investigate the effect LAS on ion transport and homeostasis in epithelia cells. A6 cells form a polarised epithelium when grown on permeable supports, actively absorb sodium and secrete chloride. Only the addition of LAS (100 microM) to the apical solution of A6 epithelia resulted in an increase in the active ion transport measured as short circuit current (SCC) and transepithelial conductance (G(t)). This increase could not be affected by the sodium channel inhibitor amiloride (100 microM), indicating that LAS stimulated the chloride secretion. Change in the intracellular calcium concentration (Ca(2+))(i) was measured in fura-2 loaded A6 cells, since it known that increase in (Ca(2+))(i) stimulate chloride secretion. LAS induced a concentration-dependent increase in (Ca(2+))(i) from 5 to 200 microM, where the half-maximal stimulating concentration on 100 mM resulted in an increase in (Ca(2+))(i) from 108+/-15 to 570+/-26 nM (n=4; P<0.01). The increase in (Ca(2+))(i) could be blocked by the calcium chelator ethylenebis(5-oxyethylenenitrilo)tetraacetic acid (EGTA), showing that the effect of LAS was due to influx of extracellular calcium. Furthermore, it was shown that the calcium channel inhibitor verapamil (0.2 mM) abolished the LAS induced increase in (Ca(2+))(i) and Gt when applied to the apical solution. However, verapamil has no inhibitory effect on these parameters when the non-ionic detergent Triton X-100 (100 microM) was added to A6 cells. These results indicate that LAS induced a specific activation of calcium channels in the apical membrane of A6 epithelia, leading to increase in (Ca(2+))(i) and thereby increased chloride secretion as a result of stimulation of calcium-dependent chloride channels in the apical membrane. The change in ion homeostasis is thought to be the fundamental reason to the physiological and toxic effects induced by LAS in marine organism. PMID:11566588

Bjerregaard, H F; Staermose, S; Vang, J

282

La mujer en defensa de la mujer: voces femeninas del romanticismo cubano (Poesía y cuento)  

Microsoft Academic Search

Throughout history, women have played an important role in literature. Nevertheless, since Sappho's poetry until now, feminine voices have had to struggle for recognition of their works.\\u000aBefore the nineteenth century, women were almost ignored in Spanish literature. Society kept them as \\

Luis Marcelino Gómez

2001-01-01

283

Prevalence of ectoparasitic arthropods on wild animals and cattle in the Las Merindades area (Burgos, Spain).  

PubMed

This paper reports the prevalence of ectoparasitic arthropods in sampled groups of wild (n = 128; 16 species) and domestic (n = 69; 3 species) animals in the Las Merindades area of the Province of Burgos, Spain. The study revealed that wild animals were more infested and with a wider variety of ectoparasites than domestic animals. The parasitic prevalence was 67% for wild animals and 48% for livestock. In this way, 39% of animals were infected by ticks. Ixodes ricinus and Ixodes hexagonus were the most prevalent species whereas Dermacentor reticulatus showed affinity for the fox and wolf. The overall prevalence of parasitisation by fleas was 27%. Ctenophthalmus spp. showed the wider range host in wild animals, while Pulex irritans was the most frequent specie found. The parasitic prevalences by lice (Trichodectes melis, Trichodectes canis and Trichodectes mustelae) and by mite (Neotrombicula spp., Laelaps agilis and Sarcoptes scabiei) were 4% and 12%, respectively. In both cases only wild animals were found parasited. PMID:21894267

Domínguez-Peñafiel, G; Giménez-Pardo, C; Gegúndez, Mi; Lledó, L

2011-08-01

284

Giant Magellan Telescope site evaluation and characterization at Las Campanas Observatory  

NASA Astrophysics Data System (ADS)

Las Campanas Observatory has been designated as the location for the Giant Magellan Telescope (GMT). We report results obtained since the commencement, in 2005, of a systematic site testing campaign at LCO. Meteorological (cloud cover, temperature, pressure, wind, and humidity) and DIMM seeing data have been obtained at three potential sites, and are compared with identical data taken at the site of the twin Magellan 6.5m telescopes. In addition, measurements of the turbulence profile of the free-atmosphere above LCO have been collected with a MASS/DIMM. We examine the contribution to the seeing arising from turbulence in the ground layer (defined here as below an altitude of 500 m) through the difference between the turbulence integrals in the full atmosphere (as measured by DIMM) and in the free atmosphere (as measured by MASS). Additionally, we consider photometric quality, light pollution, and precipitable water vapor at LCO.

Thomas-Osip, Joanna E.; Prieto, Gabriel; Johns, Matt; Phillips, Mark M.

2008-08-01

285

Two campaigns to compare three turbulence profiling techniques at Las Campanas Observatory  

NASA Astrophysics Data System (ADS)

In preparation to characterize the Giant Magellan Telescope site and guide the development of its adaptive optics system, two campaigns to systematically compare the turbulence profiles obtained independently with three different instruments were conducted at Las Campanas Observatory in September, 2007 and January 2008. Slope detection and ranging (SLODAR) was used on the 2.5-m duPont telescope. SLODAR measures the C2n profile as a function of altitude through observations of double stars. The separation of the observed double star sets the maximum altitude and height resolution. Ground layer (altitudes < 1 km) and free atmosphere turbulence profiles are compared with those obtained with a lunar scintillometer (LuSci) and a multi-aperture scintillation sensor (MASS), respectively. In addition, the total atmospheric seeing was measured by both SLODAR and a differential image motion monitor (DIMM).

Thomas-Osip, Joanna; Bustos, Edison; Goodwin, Michael; Jenkins, Charles; Lambert, Andrew; Prieto, Gabriel; Tokovinin, Andrei

2008-08-01

286

Perchlorate uptake by salt cedar (Tamarix ramosissima) in the Las Vegas wash riparian ecosystem.  

PubMed

Perchlorate ion (ClO4-) has been identified in samples of dormant salt cedar (Tamarix ramosissima) growing in the Las Vegas Wash. Perchlorate is an oxidant, but its reduction is kinetically hindered. Concern over thyroid effects caused the Environmental Protection Agency (EPA) to add perchlorate to the drinking water Contaminant Candidate List (CCL). Beginning in 2001, utilities will look for perchlorate under the Unregulated Contaminants Monitoring Rule (UCMR). In wood samples acquired from the same plant growing in a contaminated stream, perchlorate concentrations were found as follows: 5-6 microg g(-1) in dry twigs extending above the water and 300 microg g(-1) in stalks immersed in the stream. Perchlorate was leached from samples of wood, and the resulting solutions were analyzed by ion chromatography after clean-up. The identification was confirmed by electrospray ionization mass spectrometry after complexation of perchlorate with decyltrimethylammonium cation. Because salt cedar is regarded as an invasive species, there are large scale programs aimed at eliminating it. However, this work suggests that salt cedar might play a role in the ecological distribution of perchlorate as an environmental contaminant. Consequently, a thorough investigation of the fate and transport of perchlorate in tamarisks is required to assess the effects that eradication might have on perchlorate-tainted riparian ecosystems, such as the Las Vegas Wash. This is especially important since water from the wash enters Lake Mead and the Colorado River and has the potential to affect the potable water source of tens of millions of people as well as irrigation water used on a variety of crops, including much of the lettuce produced in the USA. PMID:10902849

Urbansky, E T; Magnuson, M L; Kelty, C A; Brown, S K

2000-07-10

287

Asambleas tribales , \\  

Microsoft Academic Search

Durante años mis temas de investigación y de intervención en el campo de las adicciones han estado atravesados por las dimensiones de género (diferencias en las modalidades de adicción para las mujeres y los varones, y formas de ayudar específicas en cada caso) y por la relación entre la adicción a sustancias y los abusos (maltratos, violencia) hacia las personas.

Cristina Ravazzola

288

Preliminary Field Report on the Findings and Results of the Evaluation of the Cultural and Historical Resources of the Las Cruces Arroyo Lithic Site (EPCM 32:106:10:3) in Las Cruces, New Mexico.  

National Technical Information Service (NTIS)

The purpose of this evaluation of the Las Cruces Arroyo Lithic Site, El Paso Centennial Museum number 32:106:10:3, has been to evaluate the cultural and historical resources of the site and to make recommendations relative to their conservation prior to t...

T. W. Greiser

1973-01-01

289

Effect of carbon chain and phenyl isomer distribution on use properties of linear alkylbenzene sulfonate: A comparison of ‘high’ and ‘low’ 2-phenyl LAS homologs  

Microsoft Academic Search

Phenyl isomer distributions, within current commercial limits of HF and A1C13 linear alkylbenzene sulfonates (LAS), have little\\u000a effect on dishwashing performance in light-duty liquids (LDL), detergency performance in heavy-duty powders (HDP), and interfacial\\u000a tension value. The most important factor in determining performance differences among commercial LAS samples is carbon chain\\u000a homolog distribution. Both HF and A1C13 LAS perform equally well

K. Lee Matheson; Ted P. Matsoim

1983-01-01

290

Recepción y extensión de las explicaciones metafísicas de los números imaginarios en la España del siglo XIX  

Microsoft Academic Search

1. Preliminares El problema del rigor en Matemáticas puede afrontarse al menos desde dos puntos de vista. El primero, que encontramos sobre todo en las Matemáticas contemporáneas, procede del explosivo desarrollo de esta ciencia durante el Siglo XIX y se distingue sobre todo porque los matemáticos ejercientes son entrenados en ciertas técnicas que en líneas generales se componen de una

JOSÉ M. PACHECO CASTELAO

291

Propuesta de una escala para medir el grado de orientación al mercado de las cooperativas agroalimentarias españolas  

Microsoft Academic Search

El interés de este papel reside en el estudio de la orientación al mercado en un sector en el que la búsqueda del beneficio económico no es un factor prioritario: el sector cooperativista español. Como señala la legislación española, su objetivo es fundamentalmente la satisfacción de las necesidades de los socios cooperativistas, justificando de esta forma su pertenencia al sector

Jesús Cambra Fierro; Ana Fuster Mur

2004-01-01

292

What Happens in Vegas Does "Not" Stay in Vegas: Youth Leadership in the Immigrant Rights Movement in Las Vegas, 2006  

ERIC Educational Resources Information Center

|Students calling themselves the Las Vegas Activist Crew shut down the city's famed Strip on May 1, 2006, with an immigrant rights protest that was one of the largest demonstrations in Nevada's history. This research analyzes the ways that students engage in activism to improve their own social conditions and those of their communities. The…

Revilla, Anita Tijerina

2012-01-01

293

Descodificacion de las practicas discursivas en la obra poetica y narrativa de Ester de Izaguirre y Loreina Santos Silva  

Microsoft Academic Search

La obra de Ester de Izaguirre (Paraguay - 1923) y Loreina Santos Silva (Puerto Rico - 1933) delibera bajo distintos fondos tematicos la problematica del ser en tres practicas discursivas: la especulativa, la introspectiva y la testimonial. La primera diversificacion dialogica se da en el compendio de la obra poetica general como un proyecto hermeneutico que continuamente discurre sobre las

Rosa Tezanos-Pinto

2003-01-01

294

Las escuelas de secundaria en América Latina y el Caribe y la transición al mundo del trabajo  

Microsoft Academic Search

En este documento se analiza la organización de las escuelas secundarias en América Latina y el Caribe. Se tratan temas como son la provisión de escuelas para un conjunto estudiantil cada vez más heterogéneo y la triple función de preparar a los alumnos para la educación superior, formar ciudadanos serios y responsables y ofrecer cualquier tipo de formación que puedan

Claudio de Moura Castro; Martin Carnoy; Laurence Wolff

2000-01-01

295

Equilibrium partitioning theory to predict the sediment toxicity of the anionic surfactant C 12-2-LAS to Corophium volutator  

Microsoft Academic Search

The study of the effect of the sorption of linear alkylbenzene sulfonates (LAS) on the bioavailability to marine benthic organisms is essential to refine the environmental risk assessment of these compounds. According to the equilibrium partitioning theory (EqP), the effect concentration in water-only exposure will be similar to the effect concentration in the sediment pore water. In this work, sorption

Ángeles Rico-Rico; Ali Temara; Joop L. M. Hermens

2009-01-01

296

Ethnobotany and antibacterial activity of some plants used in traditional medicine of Zapotitlán de las Salinas, Puebla (México)  

Microsoft Academic Search

The village of Zapotitlán de las Salinas is situated in the Valley of Tehuacán-Cuicatlán, Puebla, Mexico. Plant species used by the local inhabitants to treat gastrointestinal diseases were identified using ethnobotanical, ethnographic and taxonomic methods. Out of 119 interviews, 44 plant species were registered, of which the following are the most frequently used (listed in descending order): Lippia graveolens H.B.

T. Hernández; M. Canales; J. G. Avila; A. Duran; J. Caballero; A. Romo de Vivar; R. Lira

2003-01-01

297

Solar Radiation as a Sole Source of Energy for Photovoltaics in Las Vegas, Nevada, for July and December.  

National Technical Information Service (NTIS)

Hourly global radiation data collection by the National Weather Service in Las Vegas, Nevada, is analyzed. Only the data for July and December 1977 and 1978 are used. Global radiation data represent the total direct solar radiation plus diffuse sky radiat...

D. Randerson

1981-01-01

298

NÚMERO Y SÍMBOLO EN LOS EXORDIOS DE L'ORFEO Y LAS VESPRO DELLA BEATA VERGINE DE CLAUDIO MONTEVERDI  

Microsoft Academic Search

La figura de la Música prologa en cinco estrofas los cinco actos de la «favola» de L'Orfeo como un antiguo oráculo, sin el cual difícilmente hubiera podido iniciarse la narración de esta mágica «favola». Tal y como ocurre con el primer número de las Vespro, el prólogo de L'Orfeo dista mucho de ser un simple exordio retórico, según la disposición

Josep Maria Gregori i Cifré

2005-01-01

299

Estimación de las funciones de costo marginal de abatimiento de material particulado para fuentes fijas en el Valle de Aburrá  

Microsoft Academic Search

Este artículo tiene como objetivo principal estimar las funciones de costo marginal de abatimiento de material particulado para fuentes fijas en el Valle de Aburrá. Esta información es necesaria si se desea establecer in Sistema de Permisos de Emisión Tranasables para el área Metropolitana, como política ambiental para el control de contaminación atmosférica por material particulado. Para la estimulación de

Milena Eveyde Mejía Giraldo; Iván David Oviedo Restrepo

2006-01-01

300

Ambient air monitoring during the 2011 Las Conchas wildland fire near Los Alamos, U.S.A.  

SciTech Connect

Air monitoring data collected during the Las Conchas fire near the Los Alamos National Laboratory during 2011 are presented. Data included are for selected radionuclides and selected metals found in particulate matter. None of these analytes were seen at levels which exceeded any state or federal standards.

Green, Andrew A. [Los Alamos National Laboratory; Schlemann, Shea A. [Los Alamos Technical Associates; Young, Daniel L. [Los Alamos National Laboratory

2012-08-31

301

Hydrostratigraphic Framework of the Raton, Vermejo, and Trinidad Aquifers in the Raton Basin, Las Animas County, Colorado.  

National Technical Information Service (NTIS)

Exploration for and production of coalbed methane has increased substantially in the Rocky Mountain region of the United States since the 1990s. During 1999-2004, annual production of natural gas (coalbed methane) from the Raton Basin in Las Animas County...

K. R. Watts

2006-01-01

302

What Happens in Vegas Does "Not" Stay in Vegas: Youth Leadership in the Immigrant Rights Movement in Las Vegas, 2006  

ERIC Educational Resources Information Center

Students calling themselves the Las Vegas Activist Crew shut down the city's famed Strip on May 1, 2006, with an immigrant rights protest that was one of the largest demonstrations in Nevada's history. This research analyzes the ways that students engage in activism to improve their own social conditions and those of their communities. The…

Revilla, Anita Tijerina

2012-01-01

303

Developing Fieldwork in Social and Cultural Geography: Illustrations from a Residential Field Class in Los Angeles and Las Vegas.  

ERIC Educational Resources Information Center

Argues that fieldwork develops student understanding of various concerns in social and cultural geography. Recommends using a new approach that focuses on the role of fieldwork in the research process and illustrates this approach by describing an account of a residential field class to Los Angeles (California) and Las Vegas (Nevada). (CMK)

May, Jon

1999-01-01

304

Female Adolescent Subjectivities in Las Vegas: Poststructural Thoughts on the Intersections of Gender, Sexuality, Consumer Logic and Curriculum  

ERIC Educational Resources Information Center

In this article, data collected from an ethnographic study of adolescent girls growing up in the city of Las Vegas in the US is used to further our understanding of the role of mediated sex and consumer culture and in relationship to emerging adolescent female identities. Girls in this study articulated a clear sense of their abilities to make…

Dentith, Audrey M.

2004-01-01

305

Los efectos de la estructura monopolística de los mercados en la evaluación de las empresas privatizadas en Colombia  

Microsoft Academic Search

Este estudio pretende evaluar si las empresas que fueron privatizadas en Colombia durante los años noventa mejoraron sustancialmente su productividad y rentabilidad, como consecuencia de los cambios gerenciales que se debieron dar, o si por el contrario, continuaron en niveles similares, contrariando la hipótesis de que los nuevos dueños propiciarían cambios sustanciales en su estrategia, como lo demuestra la experiencia

Jaime Andrés Collazos R; Héctor Ochoa D

2005-01-01

306

LA RELACIÓN ENTRE LAPOLÍTICA PARA PROMOVER EL DESARROLLO DE LAS MIPYMES EN COLOMBIA Y LOSMODELOS DE DESARROLLO E INDUSTRIALIZACIÓN  

Microsoft Academic Search

Este trabajo busca evidencia en la literatura sobre la posible relación existente en Colombia entre los instrumentos de política de promoción de micro, pequeñas y medianas empresas (MIPYMES) y los modelos de desarrollo económico e ndustrialización. Por lo tanto, se analizan los planes de desarrollo económico y se estudian las leyes y documentos aprobados por el Consejo Nacional de Política

MARÍA TERESA VICTORIA

2003-01-01

307

Failure Analysis of a Poly (Vinyl Chloride) (PVC) Plastic Natural Gas Transmission Pipe from Las Vegas, Nevada.  

National Technical Information Service (NTIS)

A natural gas leak from a poly(vinyl chloride) (PVC) gas distribution line was the reported cause of a fatal explosion in a motel complex in Las Vegas, Nevada. An analysis of the pipe was conducted to determine the cause of failure. The results indicated ...

S. D. Toner

1974-01-01

308

DERECHO E INNOVACIÓN METODOLÓGICA PARA LA ADQUISICIÓN DE LAS COMPETENCIAS Y HABILIDADES EN EL TITULO DE GRADO EN TRABAJO SOCIAL  

Microsoft Academic Search

El artículo presenta, en primer lugar, la estrecha relación entre el Derecho y el Trabajo Social y, en segundo lugar, la metodología innovadora en la docencia de las prácticas curriculares del Titulo de Grado de Trabajo Social de la Universidad de Murcia que aglutina la cooperación docente, profesional e institucional. El objetivo del Titulo es formar profesionales preparados para desarrollar

Enrique Pastor Seller

2011-01-01

309

Activities of the Laboratoire d'Astronomie Spatiale Rapport d'Activite du L.a.S. 1971 - 1972.  

National Technical Information Service (NTIS)

The activities of the Laboratoire d'Astronomie Spatiale (LAS) during the year 1971 to 1972 are presented. They include CEPHEE, TD-2, Faust, and Janus experiments as well as the work performed at the absolute calibration, optics, electronics, library depar...

1972-01-01

310

Morphological and physical characteristics of the Virgo Cluster - First results from the Las Campanas photographic survey  

NASA Astrophysics Data System (ADS)

Preliminary results are presented of a photographic survey of the Virgo cluster to the faintest convenient limit of the Las Campanas du Pont 2.5 m reflector, performed in order to study the complexity of both the surface and velocity distributions within the central 6 degree radius region. The survey is described and the resulting Catalog is discussed, and the frequency of galaxy types found and listed in the Catalog is described. The physical properties of the dwarfs are summarized, and luminosity functions are given separately for each morphological type. The progressive change of (MBT) faintward along the morphological sequence from Sc I through Sm and Im types is shown, leading to a calibration of the de Vaucouleurs Lambda luminosity index and a determination of its intrinsic dispersion. The preliminary results on the distribution of galaxies of all types in the two principal subclustering regions found are summarized, and the velocity distributions over the face of the 6 degree core are discussed for the various galaxy types.

Sandage, A.; Binggeli, B.; Tammann, G. A.

311

Fueling Population Growth in Las Vegas: How Large-scale Groundwater Withdrawal Could Burn Regional Biodiversity  

NSDL National Science Digital Library

This article from the September 2007 issue of BioScience provides information about urban development and the impacts on groundwater and biodiversity. Policy strategies are also discussed. Explosive growth in Las Vegas, Nevada, has stimulated demand for additional water supplies. To meet these needs, local officials hope to obtain rights to about 200,000 acre-feet (246.70 million cubic meters [m3]) per year from a regional groundwater aquifer extending from Salt Lake City, Utah, to Death Valley, California. Officials from satellite communities are pursuing rights to an additional 870,487 acre-feet (1.07 billion m3) per year. If granted, these new permits would trigger declines in groundwater across at least 78 basins covering nearly 130,000 square kilometers. Water-rights decisions have historically interpreted economic development as a more compelling public interest than maintenance of natural systems. If economic development continues to drive allocation decisions, consequent declines in the water table, spring discharge, wetland area, and streamflow will adversely affect 20 federally listed species, 137 other water-dependent endemic species, and thousands of rural domestic and agricultural water users in the region. Reducing consumption and implementing cost-effective technologies, such as recovery of urban runoff and shallow saline groundwater, indirect reuse of potable water, and desalinization, offer ways to meet metropolitan and ecological needs within the limits of the resource.

JAMES E. DEACON, AUSTIN E. WILLIAMS, CINDY DEACON WILLIAMS, JACK E. WILLIAMS (;)

2007-09-01

312

Using mixture tuned match filtering to measure changes in subpixel vegetation area in Las Vegas, Nevada  

NASA Astrophysics Data System (ADS)

In desert cities, securing sufficient water supply to meet the needs of both existing population and future growth is a complex problem with few easy solutions. Grass lawns are a major driver of water consumption and accurate measurements of vegetation area are necessary to understand drivers of changes in household water consumption. Measuring vegetation change in a heterogeneous urban environment requires sub-pixel estimation of vegetation area. Mixture Tuned Match Filtering has been successfully applied to target detection for materials that only cover small portions of a satellite image pixel. There have been few successful applications of MTMF to fractional area estimation, despite theory that suggests feasibility. We use a ground truth dataset over ten times larger than that available for any previous MTMF application to estimate the bias between ground truth data and matched filter results. We find that the MTMF algorithm underestimates the fractional area of vegetation by 5-10%, and calculate that averaging over 20 to 30 pixels is necessary to correct this bias. We conclude that with a large ground truth dataset, using MTMF for fractional area estimation is possible when results can be estimated at a lower spatial resolution than the base image. When this method is applied to estimating vegetation area in Las Vegas, NV spatial and temporal trends are consistent with expectations from known population growth and policy goals.

Brelsford, Christa; Shepherd, Doug

2013-09-01

313

Radial density and density evolution of radio galaxies in the Las Campanas redshift survey  

NASA Astrophysics Data System (ADS)

The sample of 1157 radio-identified galaxies from the Las Campanas Redshift Survey (LCRS) (Machalski & Condon \\cite{r9}) is used to determine the radial density of both star-forming (starburst) and AGN-type galaxies with the mean redshift of 0.07 and 0.18, respectively. It is shown that the radial density distribution of these radio galaxies is essentially different from the respective distribution of optical galaxies in the parent LCRS sample. While the optical galaxies reveal a systematic decrease of their spatial density with redshift (which likely is due to some incompleteness of the optical sample increasing with the apparent isophotal magnitude of galaxies), the radio-emitting galaxies exhibit evident positive evolution of their radial density with redshift. Moreover, most of this density evolution is connected to starburst-type galaxies whose evolution can be parametrized by g(z)~ (1+z){2.5+/- 0.5}. No evident density evolution is detected in LCRS AGN galaxies. Correcting the 1.4 GHz luminosity function (RLF) (Machalski & Godlowski \\cite{r10}) for the above density evolution in starbursts and assuming its lack in AGN, a pure luminosity evolution f(z)~ (1+z){2.4+/- 0.9} is found for AGN galaxies after the comparison of the corrected RLF with the local luminosity function based on nearby UGC galaxies (cf. Condon \\cite{r3}). Oppositely, no significant luminosity evolution in starbursts is found.

Machalski, J.; Godlowski, W.

2001-05-01

314

Application of flux-corrected transport to the Las Cruces Trench site  

SciTech Connect

Transport algorithms that are appropriate for high-grid Peclet numbers are finding more applications in modeling contaminant transport as more detail about the heterogeneities of the flow fields is incorporated into the models. In this paper, the fluid corrected transport (FCT) algorithm, which was originally designed for advection only, has been modified for application to advection and dispersion of solute in a heterogeneous variably saturated soil undergoing transient flow conditions. The results presented using field observations for the hydraulic parameters over a vertical two-dimensional plane show that complex flow fields can result. The model for water flow and solute transport through the soil at the Las Cruces Trench site predicts preferential flow, with the new water bypassing old water. Overall, the effects of spatial variability appear to impact the new water more than the old water, which indicates that solute plumes that originate with the application of the new water can be much more complex than the spatial variability of the water contents would suggest.

Hills, R.G. (New Mexico State Univ., Las Cruces, NM (United States)); Fisher, K.A. (Georgia Institute of Technology, Atlanta, GA (United States)); Kirkland, M.R. (Bath and Associates, Inc., El Paso, TX (United States)); Wierenga, P.J. (Univ. of Arizona, Tucson, AZ (United States))

1994-08-01

315

Carbon Dioxide Discharged through the Las Cañadas Aquifer, Tenerife, Canary Islands  

NASA Astrophysics Data System (ADS)

Carbon dioxide is one of the first gases to escape the magmatic environment due to its low solubility in basaltic magmas at low pressures. The exsolved CO2 gas migrates towards the surface through rock fractures and high permeability paths. If an aquifer is located between the magmatic environment and the surface, a fraction of the CO2 emitted is dissolved in the aquifer. In this paper, an estimation of the water mass balance and the CO2 budget in Las Cañadas aquifer, Tenerife, Canary Islands, is presented. Magmatic CO2 is transported by groundwater and discharged through man-made sub-horizontal drains or galleries that exist in this island, and by the flow of groundwater discharged laterally towards other aquifers or to the ocean. In addition, the pCO2 at the gallery mouth (or entrance) and at the gallery bottom (internal and deepest discharge point where the gallery starts) are calculated and mapped. The total CO2 advectively transported by groundwater is estimated to range from 143 to 211 t CO2 d-1. Considering that the diffuse soil emission of CO2 for the same area is 437 t d-1, the diffuse/dissolved CO2 flux ratio varies between 2 and 3. The high dissolved inorganic carbon content of groundwater explains the ability of this low temperature hydrothermal water to dissolve and transfer magmatic CO2 at volcanoes, even during quiescence periods.

Marrero, Rayco; López, Dina L.; Hernández, Pedro A.; Pérez, Nemesio M.

2008-01-01

316

Pseudomonas aeruginosa Las quorum sensing autoinducer suppresses growth and biofilm production in Legionella species.  

PubMed

Bacteria commonly communicate with each other by a cell-to-cell signalling mechanism known as quorum sensing (QS). Recent studies have shown that the Las QS autoinducer N-(3-oxododecanoyl)-l-homoserine lactone (3-oxo-C(12)-HSL) of Pseudomonas aeruginosa performs a variety of functions not only in intraspecies communication, but also in interspecies and interkingdom interactions. In this study, we report the effects of Pseudomonas 3-oxo-C(12)-HSL on the growth and suppression of virulence factors in other bacterial species that frequently co-exist with Ps. aeruginosa in nature. It was found that 3-oxo-C(12)-HSL, but not its analogues, suppressed the growth of Legionella pneumophila in a dose-dependent manner. However, 3-oxo-C(12)-HSL did not exhibit a growth-suppressive effect on Serratia marcescens, Proteus mirabilis, Escherichia coli, Alcaligenes faecalis and Stenotrophomonas maltophilia. A concentration of 50 microM 3-oxo-C(12)-HSL completely inhibited the growth of L. pneumophila. Additionally, a significant suppression of biofilm formation was demonstrated in L. pneumophila exposed to 3-oxo-C(12)-HSL. Our results suggest that the Pseudomonas QS autoinducer 3-oxo-C(12)-HSL exerts both bacteriostatic and virulence factor-suppressive activities on L. pneumophila alone. PMID:19383702

Kimura, Soichiro; Tateda, Kazuhiro; Ishii, Yoshikazu; Horikawa, Manabu; Miyairi, Shinichi; Gotoh, Naomasa; Ishiguro, Masaji; Yamaguchi, Keizo

2009-04-21

317

La caracterización de la gestión de la calidad como un proceso inherente a la gestión de la eficacia en las organizaciones  

Microsoft Academic Search

La gestión de la calidad cobra una importancia relevante en el logro de la eficacia para cualquier tipo de organización. Su caracterización permite determinar el conjunto de propiedades distintivas, para una vez identificadas y mediante un proceso de toma de decisiones, posibilite que las que se encuentran de manera correcta sigan comportándose de ese modo, y las que están de

Juan Carlos Mayo Alegre; Luis Manuel Pérez Proenza; Saadia Noemí Reyes Benítez; Néstor Alberto Loredo Carballo

2011-01-01

318

LA DECISIÓN DE INNOVAR DE LAS EMPRESAS TURÍSTICAS: UN ANÁLISIS EMPÍRICO DE LA INDUSTRIA HOSTELERA \\/ THE INNOVATION DECISION OF TOURISM FIRMS: AN EMPIRICAL ANALYSIS OF THE HOSPITALITY INDUSTRY  

Microsoft Academic Search

Este trabajo analiza los factores de índole tanto interna como externa que pueden ser determinantes en la decisión de emprender actividades innovadoras en las empresas hosteleras. Para llevar a cabo la contrastación empírica de las hipótesis propuestas se ha utilizado un modelo de regresión logística binaria. El estudio empírico utiliza una muestra de 443 empresas que forman parte de la

M. C. López-Fernández; A. M. Serrano-Bedia; R Gómez-López

2009-01-01

319

Análisis de la decisión de exportar de las empresas agroalimentarias españolas: una aproximación con datos microeconómicos\\/Agri-food Firms Export Behaviour: a Microeconomic Approach  

Microsoft Academic Search

El objetivo de este trabajo es estudiar el comportamiento estratégico de las empresas agroalimentarias españolas en relación a los mercados exteriores. Para llevar a cabo este objetivo se ha definido un modelo de competencia imperfecta en el que unas empresas compiten a la Cournot y otras de manera competitiva. Además, se ha supuesto que las empresas toman simultáneamente tres decisiones

M. AMEUR; A. GRACIA ROYO

2004-01-01

320

ANÁLISIS DE CONTENIDO DE LAS PUBLICACIONES ESPAÑOLAS SOBRE RELACIONES VERTICALES ENTRE EMPRESAS \\/ CONTENT ANALYSIS OF SPANISH PUBLICATIONS ON VERTICAL RELATIONSHIPS AMONG ENTERPRISES  

Microsoft Academic Search

En los últimos años los investigadores han mostrado un creciente interés en las relaciones interorganizativas verticales, principalmente en la Cadena de Suministro. La ausencia de trabajos previos de revisión bibliográfica sobre este tema, que permitan plantear las cuestiones clave a estudiar en Gestión de la Cadena de Suministro, nos ha llevado a realizar un análisis de contenido de la investigación

M. T. Martínez Fernández; T Vallet Bellmunt; R. Barreda Tarrazona

2010-01-01

321

“Our father has won a great victory”: the authorship of Berenguela's account of the battle of Las Navas de Tolosa, 1212  

Microsoft Academic Search

Scholars studying the letter of Berenguela to Blanche of Castile describing Alfonso VIII's victory at the battle of Las Navas de Tolosa initially interpreted it within a familial context. The letter is a source for the battle of Las Navas, one that is not quite an eyewitness account, but one penned by the daughter of Alfonso VIII who, by her

Theresa M. Vann

2011-01-01

322

SOURCE AND PATHWAY DETERMINATION FOR BERYLLIUM FOUND IN BECHTEL NEVADA NORTH LAS VEGAS FACILITIES  

SciTech Connect

In response to the report ''Investigation of Beryllium Exposure Cases Discovered at the North Las Vegas Facility of the National Nuclear Security Administration'', published by the U.S. Department of Energy (DOE), National Nuclear Security Administration (NNSA) in August 2003, Bechtel Nevada (BN) President and General Manager Dr. F. A. Tarantino appointed the Beryllium Investigation & Assessment Team (BIAT) to identify both the source and pathway for the beryllium found in the North Las Vegas (NLV) B-Complex. From September 8 to December 18, 2003, the BIAT investigated the pathway for beryllium and determined that a number of locations existed at the Nevada Test Site (NTS) which could have contained sufficient quantities of beryllium to result in contamination if transported. Operations performed in the B-1 Building as a result of characterization activities at the Engine Maintenance, Assembly, and Disassembly (EMAD); Reactor Maintenance, Assembly, and Disassembly (RMAD); Test Cells A and C; and the Central Support Facility in Area 25 had the greatest opportunity for transport of beryllium. Investigative monitoring and sampling was performed at these sites with subsequent transport of sample materials, equipment, and personnel from the NTS to the B-1 Building. The timeline established by the BIAT for potential transport of the beryllium contamination into the B-1 Building was from September 1997 through November 2002. Based on results of recently completed swipe sampling, no evidence of transport of beryllium from test areas has been confirmed. Results less than the DOE beryllium action level of 0.2 ???g/100 cm2 were noted for work support facilities located in Area 25. All of the identified sites in Area 25 worked within the B-1 tenant's residency timeline have been remediated. Legacy contaminants have either been disposed of or capped with clean borrow material. As such, no current opportunity exists for release or spread of beryllium contamination. Historical records indicate that there are locations at the NTS which contain hazardous quantities of beryllium; however, because beryllium was not always considered a contaminant of concern, complete characterization was not performed prior to remediation efforts. Today, it is not practical to characterize Area 25 for beryllium due to the successful remediation. Analysis of sample data collected in B-1 for the BIAT was performed for the purpose of confirming past results and identifying a source of beryllium through the use of markers. The results confirmed the presence of man-made beryllium contamination in the B-1 High Bay at levels consistent with the NNSA Report. No source markers were found that would be associated with NTS historical nuclear rocket or weapons-related operations. Beryllium contamination was identified in the southwest area of the B-1 High Bay in characteristic association with materials handled during historic metal-working operations. Use of source marker analysis suggests a contributor of beryllium found in carpeted areas of the B-Complex may be naturally occurring. Naturally occurring beryllium is not regulated by Title 10 Code of Federal Regulations Part 850 (10 CFR 850) (see Appendix A). No current uncontrolled beryllium source or transport pathways have been identified as available for spread of contamination to uncontrolled areas from the NTS.

BECHTEL NEVADA

2004-07-01

323

Degradation of linear alkylabenzene sulfonate (LAS) and its compounds in Donghu Lake (Hubei, P.R.C.) determined by high performance liquid chromatography (HPLC)  

NASA Astrophysics Data System (ADS)

Commercial linear alkylbenzene sulfonate (LAS), mixture of alkylchain lengths and phenyl position isomers (C10-C13), is widely used as a major constituent of household and industrial detergents in the People's Republic of China. Degradation process and behaviour of LAS compounds during an 82-hour lake water die-away study, with an added LAS concentration of 1.5mg·L-1, was quantified and accomplished by HPLO-UV after extractionon the SepPek C18 reversed-phase cartridges. The degradation rate became progressively faster with increasing chain length. The technique described in this study is fast, sensitive and specific, and can be used to determine low levels of LAS and for establishing water quality criteria and standards relating to LAS and its compounds.

Ayfer, Yediler; Xu, Ying; Zhang, Yongyuan; Chen, Junjian

1990-06-01

324

The influence of faults in basin-fill deposits on land subsidence, Las Vegas Valley, Nevada, USA  

Microsoft Academic Search

.  The role of horizontal deformation caused by pumping of confined-aquifer systems is recognized as contributing to the development\\u000a of earth fissures in semiarid regions, including Las Vegas Valley, Nevada. In spite of stabilizing water levels, new earth\\u000a fissures continue to develop while existing ones continue to lengthen and widen near basin-fill faults. A three-dimensional\\u000a granular displacement model based on Biot's

Thomas J. Burbey

2002-01-01

325

Enfermedad cerebrovascular en la Diabetes Mellitus y el síndrome metabólico. Validez de las tablas de riesgo en la Atención Primaria  

Microsoft Academic Search

Objetivos: Evaluar el riesgo de enfermedad cerebrovascular en la diabetes mellitus y el síndrome metabólico, y analizar la validez de las tablas de cálculo del riesgo cerebrovascular en la AP\\u000aDiseño: Estudio de cohorte multicéntrico. Emplazamiento y participantes: Áreas Básicas de Salud urbanas. Muestra aleatoria representativa de la población asignada entre 55 y 85 años de edad. Período entre 1998

Matilde González Solanellas; Marta Puig Soler; Ana Romagosa Perez-Portabella; Clàudia Caselles Montagut; Montserrat Grau Carod; Hegoi Segurola Gurrutxaga; Santiago Lancho Lancho; Edurne Zabaleta del Olmo

2009-01-01

326

Hydrothermal alteration and REE-Th mineralization at the Rodeo de Los Molles deposit, Las Chacras batholith, central Argentina  

Microsoft Academic Search

REE (rare-earth-element) and Th mineralization at the Rodeo de Los Molles deposit occurs within an elliptical body of hydrothermally altered rocks (fenite) located in a biotite monzogranite of the Las Chacras batholith. Ore assemblages are found as isolated patches of intergrown britholite, allanite, apatite, bastnaesite, fluorite, sphene, quartz, and aegirine-augite, as well as nodules of uranothorite and late-stage veins of

Raul Lira; Edward M. Ripley

1992-01-01

327

Valen Mas Que Mil Palabras: Las Etiquetas de Advertencia Pictoricas de Tabaco y Los Derechos Linguisticos de EEUU  

Microsoft Academic Search

Este informe pretende describir el problema fundamental de desigualdad reflejado y sostenido por el uso en EE.UU. de etiquetas sólo de texto y en inglés. Nuestra investigación demuestra una discriminación lingüística innegable en las advertencias de salud sobre el tabaco. El uso de etiquetas de advertencia escritas en inglés y sin dibujos ha creado una grave brecha en la conciencia

Jaron Browne; Susana Hennessey-Lavery; Kim Rogers

2007-01-01

328

Chronic effects of linear alkylbenzene sulfonate (LAS) and ammonia on rainbow trout ( Oncorhynchus mykiss) fry at water criteria limits  

Microsoft Academic Search

Rainbow trout fry was chronically exposed (54 days) to 0.2 mg l?1 LAS(C11–12). Although this concentration is considered to be the NOEC (no observed effect concentration), lamellar gill epithelia hypertrophied and swimming capacity was reduced. Furthermore, the exposure of the fish to a secondary stressor (low salinity challenge test) caused increased mortality. Un-ionized ammonia did not affect the above-mentioned parameters

Rudolf Hofer; Zsigmond Jeney; Franz Bucher

1995-01-01

329

Assessment of the potential toxicity of a linear alkylbenzene sulfonate (LAS) to freshwater animal life by means of cladoceran bioassays  

Microsoft Academic Search

The acute and chronic toxic effects of LAS on the cladocerans Daphnia similis, Ceriodaphnia dubia and Ceriodaphnia silvestrii were tested. Both types of toxicity bioassays and the methods of culture and stock maintenance of the test organisms conformed\\u000a to the recommendations of ABNT (Brazilian Society of Technical Standards), which closely follow the standard methods of USEPA.\\u000a The results obtained for

Katiuscia da Silva Coelho; Odete Rocha

2010-01-01

330

Characterization of the Sediment Routing System of the Argentine Las Peñas Thrust From ASTER Imagery Interpretation and DEM Terrain Analysis  

Microsoft Academic Search

In an arid region north of Mendoza, Argentina active structures of the Precordilleran fold and thrust belt control sedimentation in the proximal Andean foreland basin. Initiation of new thrust faults and along-strike growth of fault-propagation folds drives uplift of hanging-wall source areas. Drainage basin initiation and development in the Las Peñas thrust hanging-wall triggers erosion of sediment, controlling transport and

I. S. Abrahamson; J. Schmitt

2009-01-01

331

An Evaluation of Lead Contamination in Plastic Toys Collected from Day Care Centers in the Las Vegas Valley, Nevada, USA  

Microsoft Academic Search

Childhood exposure to environmental lead continues to be a major health concern. This study examined lead content within the\\u000a plastic of children’s toys collected from licensed day care centers in the Las Vegas valley, Nevada. It was hypothesized that\\u000a the use of lead as a plastics stabilizer would result in elevated lead (?600 ppm) in polyvinyl chloride plastics (PVC) compared\\u000a to

Shawn Gerstenberger

2010-01-01

332

Pseudomonas aeruginosa mutations in lasI and rhlI quorum sensing systems result in milder chronic lung infection  

Microsoft Academic Search

To understand the importance of quorum sensing in chronic Pseudomonas aeruginosa lung infection, the in vivo pathogenic effects of the wild-type P. aeruginosa PAO1 and its double mutant, PAO1 lasI rhlI, in which the signal- generating parts of the quorum sensing systems are defective were compared. The rat model of P. aeruginosa lung infection was used in the present study.

Hong Wu; Zhijun Song; Michael Givskov; Gerd Doring; Dieter Worlitzsch; Kalai Mathee; Jørgen Rygaard; Niels Høiby

2001-01-01

333

An analysis of urban thermal characteristics and associated land cover in Tampa Bay and Las Vegas using Landsat satellite data  

Microsoft Academic Search

Remote sensing data from both Landsat 5 and Landsat 7 systems were utilized to assess urban area thermal characteristics in Tampa Bay watershed of west-central Florida, and the Las Vegas valley of southern Nevada. To quantitatively determine urban land use extents and development densities, sub-pixel impervious surface areas were mapped for both areas. The urban–rural boundaries and urban development densities

George Xian; Mike Crane

2006-01-01

334

Analysis of the real estate market in Las Vegas: Bubble, seasonal patterns, and prediction of the CSW indices  

NASA Astrophysics Data System (ADS)

We analyze 27 house price indexes of Las Vegas from Jun. 1983 to Mar. 2005, corresponding to 27 different zip codes. These analyses confirm the existence of a real-estate bubble, defined as a price acceleration faster than exponential, which is found however to be confined to a rather limited time interval in the recent past from approximately 2003 to mid-2004 and has progressively transformed into a more normal growth rate comparable to pre-bubble levels in 2005. There has been no bubble till 2002 except for a medium-sized surge in 1990. In addition, we have identified a strong yearly periodicity which provides a good potential for fine-tuned prediction from month to month. A monthly monitoring using a model that we have developed could confirm, by testing the intra-year structure, if indeed the market has returned to ``normal'' or if more turbulence is expected ahead. We predict the evolution of the indexes one year ahead, which is validated with new data up to Sep. 2006. The present analysis demonstrates the existence of very significant variations at the local scale, in the sense that the bubble in Las Vegas seems to have preceded the more global USA bubble and has ended approximately two years earlier (mid 2004 for Las Vegas compared with mid-2006 for the whole of the USA).

Zhou, Wei-Xing; Sornette, Didier

2008-01-01

335

LasI/R and RhlI/R Quorum Sensing in a Strain of Pseudomonas aeruginosa Beneficial to Plants?  

PubMed Central

Pseudomonas aeruginosa possesses three quorum-sensing (QS) systems which are key in the expression of a large number of genes, including many virulence factors. Most studies of QS in P. aeruginosa have been performed in clinical isolates and have therefore focused on its role in pathogenicity. P. aeruginosa, however, is regarded as a ubiquitous organism capable of colonizing many different environments and also of establishing beneficial associations with plants. In this study we examined the role of the two N-acyl homoserine lactone systems known as RhlI/R and LasI/R in the environmental rice rhizosphere isolate P. aeruginosa PUPa3. Both the Rhl and Las systems are involved in the regulation of plant growth-promoting traits. The environmental P. aeruginosa PUPa3 is pathogenic in two nonmammalian infection models, and only the double las rhl mutants are attenuated for virulence. In fact it was established that the two QS systems are not hierarchically organized and that they are both important for the colonization of the rice rhizosphere. This is an in-depth genetic and molecular study of QS in an environmental P. aeruginosa strain and highlights several differences with QS regulation in the clinical isolate PAO1.

Steindler, Laura; Bertani, Iris; De Sordi, Luisa; Schwager, Stephan; Eberl, Leo; Venturi, Vittorio

2009-01-01

336

The role of faulting on surface deformation patterns from pumping-induced groundwater flow (Las Vegas Valley, USA)  

NASA Astrophysics Data System (ADS)

Land subsidence and earth fissuring can cause damage in semiarid urbanized valleys where pumping exceeds natural recharge. In places such as Las Vegas Valley (USA), Quaternary faults play an important role in the surface deformation patterns by constraining the migration of land subsidence and creating complex relationships with surface fissures. These fissures typically result from horizontal displacements that occur in zones where extensional stress derived from groundwater flow exceeds the tensile strength of the near-surface sediments. A series of hypothetical numerical models, using the finite-element code ABAQUS and based on the observed conditions of the Eglington Fault zone, were developed. The models reproduced the (1) long-term natural recharge and discharge, (2) heavy pumping and (3) incorporation of artificial recharge that reflects the conditions of Las Vegas Valley. The simulated hydrostratigraphy consists of three aquifers, two aquitards and a relatively dry vadose zone, plus a normal fault zone that reflects the Quaternary Eglington fault. Numerical results suggest that a 100-m-wide fault zone composed of sand-like material produces: (1) conditions most similar to those observed in Las Vegas Valley and (2) the most favorable conditions for the development of fissures to form on the surface adjacent to the fault zone.

Hernandez-Marin, Martin; Burbey, Thomas J.

2009-12-01

337

Removal of nutrients and metals by constructed and naturally created wetlands in the Las Vegas Valley, Nevada.  

PubMed

Increased water use associated with rapid growth in the Las Vegas Valley has inadvertently led to the creation of unique wetland systems in Southern Nevada with an abundance of biological diversity. Constructed and naturally created wetlands in the Las Vegas Valley watershed were studied to characterize and understand their potential role for improving ecosystem services (i.e., water purification). Nutrient and metal removal was assessed at four sites including a natural urban runoff wetland, a constructed urban runoff wetland, a constructed wastewater wetland, and a natural urban runoff/wastewater wetland. Plant nutrient uptake was dependent on ambient nutrient concentrations in water and sediments of specific wetlands, irrespective of the type of plants present. Phosphorus was mostly concentrated in below-ground plant parts whereas nitrogen was concentrated in above-ground parts. As for metalloids, bulrushes were more efficient than cattails at taking up arsenic and selenium. Averaging all the wetland sites and plant species, total nitrogen, phosphorus, arsenic and selenium removal was 924.2, 61.5, 0.30, and 0.38 kg/ha/year, respectively. Our findings suggest that natural and created wetland systems can improve water quality in the Las Vegas Valley watershed for some common pollutants, however, other measures are still needed to improve water quality below regulatory thresholds. PMID:21125423

Adhikari, Achyut R; Acharya, Kumud; Shanahan, Seth A; Zhou, Xiaoping

2010-12-02

338

The Las Campanas Infrared Survey - V. Keck spectroscopy of a large sample of extremely red objects  

NASA Astrophysics Data System (ADS)

We present deep Keck spectroscopy, using the Deep Imaging Multi-Object Spectrograph and the Low-Resolution Imaging Spectrometer spectrographs, of a large and representative sample of 67 extremely red objects (EROs) to H= 20.5 in three fields (SSA22, Chandra Deep Field South and NTT Deep Field) drawn from the Las Campanas Infrared Survey (LCIRS). Using the colour cut (I-H) > 3.0 (Vega magnitudes) adopted in earlier papers in this series, we verify the efficiency of this selection for locating and studying distant old sources. Spectroscopic redshifts are determined for 44 sources, of which only two are contaminating low-mass stars. When allowance is made for incompleteness, the spectroscopic redshift distribution closely matches that predicted earlier on the basis of photometric data. Our spectra are of sufficient quality that we can address the important question of the nature and homogeneity of the z > 0.8 ERO population. A dominant old stellar population is inferred for 75 per cent of our spectroscopic sample, a higher fraction than that seen in smaller, less complete samples with broader photometric selection criteria (e.g. R-K). However, only 28 per cent have spectra with no evidence of recent star formation activity, such as would be expected for a strictly passively evolving population. More than ~30 per cent of our absorption-line spectra are of the `E+A' type with prominent Balmer absorption consistent, on average, with mass growth of 5-15 per cent in the past gigayear. We use our spectroscopic redshifts to improve earlier estimates of the spatial clustering of this population as well as to understand the significant field-to-field variation. Our spectroscopy enables us to pinpoint a filamentary structure at z= 1.22 in the Chandra Deep Field South. Overall, our study suggests that the bulk of the ERO population is an established population of clustered massive galaxies undergoing intermittent activity consistent with continued growth over the redshift interval 0.8 < z < 1.6.

Doherty, M.; Bunker, A. J.; Ellis, R. S.; McCarthy, P. J.

2005-08-01

339

Las Palmeras Molecular Dynamics: A flexible and modular molecular dynamics code  

NASA Astrophysics Data System (ADS)

Las Palmeras Molecular Dynamics (LPMD) is a highly modular and extensible molecular dynamics (MD) code using interatomic potential functions. LPMD is able to perform equilibrium MD simulations of bulk crystalline solids, amorphous solids and liquids, as well as non-equilibrium MD (NEMD) simulations such as shock wave propagation, projectile impacts, cluster collisions, shearing, deformation under load, heat conduction, heterogeneous melting, among others, which involve unusual MD features like non-moving atoms and walls, unstoppable atoms with constant-velocity, and external forces like electric fields. LPMD is written in C++ as a compromise between efficiency and clarity of design, and its architecture is based on separate components or plug-ins, implemented as modules which are loaded on demand at runtime. The advantage of this architecture is the ability to completely link together the desired components involved in the simulation in different ways at runtime, using a user-friendly control file language which describes the simulation work-flow.As an added bonus, the plug-in API (Application Programming Interface) makes it possible to use the LPMD components to analyze data coming from other simulation packages, convert between input file formats, apply different transformations to saved MD atomic trajectories, and visualize dynamical processes either in real-time or as a post-processing step.Individual components, such as a new potential function, a new integrator, a new file format, new properties to calculate, new real-time visualizers, and even a new algorithm for handling neighbor lists can be easily coded, compiled and tested within LPMD by virtue of its object-oriented API, without the need to modify the rest of the code.LPMD includes already several pair potential functions such as Lennard-Jones, Morse, Buckingham, MCY and the harmonic potential, as well as embedded-atom model (EAM) functions such as the Sutton-Chen and Gupta potentials. Integrators to choose include Euler (if only for demonstration purposes), Verlet and Velocity Verlet, Leapfrog and Beeman, among others. Electrostatic forces are treated as another potential function, by default using the plug-in implementing the Ewald summation method.

Davis, Sergio; Loyola, Claudia; González, Felipe; Peralta, Joaquín

2010-12-01

340

Geohydrologic reconnaissance of Lake Mead National Recreation Area; Las Vegas Wash to Opal Mountain, Nevada  

USGS Publications Warehouse

The study is a geohydrologic reconnaissance of about 170 square miles in the Lake Mead National Recreation Area from Las Vegas Wash to Opal Mountain, Nevada. The study is one of a series that describes the geohydrology of the recreation area and that indentifies areas where water supplies can be developed. Precipitation in this arid area is about 5 inches per year. Streamflow is seasonal and extremely variable except for that in the Colorado River, which adjoins the area. Pan evaporation is more than 20 times greater than precipitation; therefore, regional ground-water supplies are meager except near the Colorado River, Lake Mead, and Lake Mohave. Large ground-water supplies can be developed near the river and lakes, and much smaller supplies may be obtained in a few favorable locations farther from the river and lakes. Ground water in most of the areas probably contains more than 1,000 milligrams per liter of dissolved solids, but water that contains less than 1,000 milligrams per liter of dissolved solids can be obtained within about 1 mile of the lakes. Crystalline rocks of metamorphic, intrusive and volcanic origin crop out in the area. These rocks are overlain by conglomerate and mudstone of the Muddy Creek Formation, gravel and conglomerate of the older alluvium, and sand and gravel of the Chemehuevi Formation and younger alluvium. The crystalline rocks, where sufficiently fractured, yield water to springs and would yield small amounts of water to favorably located wells. The poorly cemented and more permeable beds of the older alluvium, Chemehuevi Formation, and younger alluvium are the better potential aquifers, particularly along the Colorado River and Lakes Mead and Mohave. Thermal springs in the gorge of the Colorado River south of Hoover Dam discharge at least 2,580 acre-feet per year of water from the volcanic rocks and metamorphic and plutonic rocks. The discharge is much greater than could be infiltrated in the drainage basin above the springs. Transbasin movement of ground water probably occurs , and perhaps the larger part of the spring discharge is underflow from Eldorado Valley. The more favorable sites for ground-water development are along the shores of Lakes Mead and Mohave and are the Fire Mountain, Opal Mountain to Aztec Wash, and Hemenway Wash sites. Wells yielding several hundred gallons per minute of water of acceptable chemical quality can be developed at these sites. (USGS)

Laney, R. L.

1981-01-01

341

Enzymatic Depilation of Animal Hide: Identification of Elastase (LasB) from Pseudomonas aeruginosa MCM B-327 as a Depilating Protease  

PubMed Central

Conventional leather processing involving depilation of animal hide by lime and sulphide treatment generates considerable amounts of chemical waste causing severe environmental pollution. Enzymatic depilation is an environmentally friendly process and has been considered to be a viable alternative to the chemical depilation process. We isolated an extracellular protease from Pseudomonas aeruginosa strain MCM B-327 with high depilation activity using buffalo hide as a substrate. This 33 kDa protease generated a peptide mass fingerprint and de novo sequence that matched perfectly with LasB (elastase), of Pseudomonas aeruginosa. In support of this data a lasB mutant of MCM B-327 strain lacked depilatory activity and failed to produce LasB. LasB heterologously over-produced and purified from Escherichia coli also exhibited high depilating activity. Moreover, reintroduction of the lasB gene to the P. aeruginosa lasB mutant via a knock-in strategy also successfully restored depilation activity thus confirming the role of LasB as the depilating enzyme.

Pandeeti, Emmanuel Vijay Paul; Pitchika, Gopi Krishna; Jotshi, Jyotsna; Nilegaonkar, Smita S.; Kanekar, Pradnya P.; Siddavattam, Dayananda

2011-01-01

342

Actitudes de madres adolescentes y adultas y su relación con la personalidad de sus hijos Attitudes of adolescent and adult mothers and their relation with their children's personality profile  

Microsoft Academic Search

La presente investigación tuvo el propósito de indagar si hay diferencias entre las actitudes de las madres adolescentes y adultas e identificar si existe una relación entre las actitudes de las madres y el perfil de personalidad de sus hijos. Participaron 35 mujeres con sus hijos, quienes cursaban el primer grado de primaria; 17 fueron madres siendo adolescentes y 18

Iris Xóchitl; Galicia Moyeda; Lucina Jiménez Vega; Susana Pavón Figueroa; Alejandra Sánchez Velasco

2006-01-01

343

Morphology and mechanics of large collapses: Sotano de las Golondrinas, Mexico  

NASA Astrophysics Data System (ADS)

The dynamics and mode of formation of large karst pipes are not yet fully understood. We present precise Lidar and structural field data of the 340+ m deep open karst shaft el Sotano de las Golondrinas, and test the geometry on a a simplified 2D evolution model. The Golondrinas shaft is located in the San Luis county, northeastern México and is developed in massive, early cretaceous (Barremian-Coniacian) reef- limestones (El Abra/ El Doctor fm.). It is a bell-shaped breakout dome that has reached the land surface, i.e. a classical Einstrurtzdoline. The dimensions and shape makes it to an interesting case study, as it has similar dimensions as breccia-pipes encountered in many paleokarsts, but is incompletely filled, so that internal structure can be easily inspected. Second, with regard to stress mechanisms controlling roof collapse, the large dimensions (270 - 130 m diameter at the base) reduce the influence (anisotropy) of geological structures in comparison to smaller pipes (e.g. <70 m diameter). We may thus test morphology against the shape of various tectonic and gravitational stress distributions. During our field campaign in 2009, it was decided to re-map the cavity using laser (Lidar and rangefinders) in order to obtain exact dimensions and high-resolution images of morphology and geologic structure. The maximum explored depth is a fissure at -512 m with the main floor between 325 and 400 meters below the skylight entrance of 80 m diameter. Overall, the shaft is cigar-shaped and oval in outline. Its horizontal length/width ratio at floor level is about 2.31, with an azimuth of elongation of about 125 degrees true. The shaft is developed along a major, steep fracture zone (115°, true) which makes up the north wall. The fracture has no detectable off-set, in all very few faults were observed. The strike of the guiding fracture, the azimuth of elongation and the direction of the least horizontal stress direction (111°, true) coincide. Where it occurs, bedding is almost horizontal. A simple 2D grid model was made to test morphological evolution of collapse into a dissolving void, using dissolution rate, yield strength and bed thickness as input parameters. Breakdown processes was represented with a beam model on unsupported beds. So far, our experiments mimic the observed bottle-shaped morphology. Probability-based models of sinkhole hazard are closely related to the expected mature architecture of the collapse-pipe field. As a comparison to the Sotano de los Golondrinas, a late Paleozoic to early Mesozoic field of collapse pipes exposed on Svalbard consists of > 250-m-tall breccia-filled collapse pipes in limestone but related to deep dissolution of underlying gypsum. The average pipe diameter is 60 m, pipes are typically asymmetric by 15% of the diameter but aspect rations similar to Golondrines are not uncommon. Several of the 50 pipes reach diameters of over 150m. The lack of terrigenous material inside the pipes suggests they did not reach the surface. Collapse breccia pipes form strong vertical heterogeneities in rock properties such as porosity and permeability, matrix density, cement, mechanical strength and lithology, affecting fluid-flow characteristics on a meter to hundred-meter scale. It is rare that pipe fields are well exposed at the kilometre scale. Studies at the km scale are fundamental for understanding basic karst and collapse processes, and yield petrophysical models that can be applied predictively to natural hazards and groundwater or hydrocarbon exploitation in paleokarst settings.

Lauritzen, S.-E.; Hammer, Ø.; Wheeler, W.; Redfield, T.; Blanco, M.; Rosales Lagarde, L.; Jamtveit, B.

2012-04-01

344

Integrating NASA's Land Analysis System (Las) Image Processing Software with an Appropriate Geographic Information System (Gis): A Review of Candidates in the Public Domain.  

National Technical Information Service (NTIS)

A user requirements analysis (URA) was undertaken to determine and appropriate public domain Geographic Information System (GIS) software package for potential integration with NASA's LAS (Land Analysis System) 5.0 image processing system. The necessity f...

G. L. Rochon

1989-01-01

345

Abundancias químicas de las estrellas CP del grupo HgMn ? Leporis y 53 Tauri. II. Boro, Berilio, Carbono, Magnesio, Aluminio y Silicio  

NASA Astrophysics Data System (ADS)

Se determinan las abundancias químicas de los elementos más livianos presentes en dos estrellas CP del grupo HgMn, ? Lep y 53 Tau, utilizando espectros IUE de alta resolución y técnicas de cálculo de espectros sintéticos. Para el cálculo de las líneas se utiliza la lista mas completa de datos atómicos disponible y el programa SYNTHE. Para el cálculo de la abundancia de un elemento se comparan, para cada imagen, los perfiles observados del mayor número de líneas presentes con los perfiles calculados obtenidos por variación de las abundancias iniciales, reteniendo la abundancia para la cual el acuerdo entre las líneas observadas y calculadas es considerado visualmente el mejor. Los resultados obtenidos son comparados con los estimados por la teoría de la difusión.

López García, Z.; Malaroda, S. M.; Faraggiana, R.

346

A CONSTRUÇÃO DA IMAGEM EM O ESPELHO IN PRIMEIRAS ESTÓRIAS DE JOÃO GUIMARÃES ROSA E EM LAS MENINAS DE PABLO PICASSO THE CONSTRUCTION OF THE IMAGE IN JOÃO GUIMARÃES ROSAS O ESPELHO IN PRIMEIRAS ESTÓRIAS AND IN PABLO PICASSOS LAS MENINAS  

Microsoft Academic Search

This article untitled The construction of the image in João Guimarães Rosa's O Espelho in Primeiras Estórias and in Pablo Picasso's Las Meninas was developed with the purpose of semiotically analyzing the works O Espelho, a short story present in João Guimarães Rosa's Primeiras Estórias and Pablo Picasso's painting Las Meninas, whose starting point was the baroque artist Diego Velázquez's

Fabiana Mori

347

The influence of faults in basin-fill deposits on land subsidence, Las Vegas Valley, Nevada, USA  

NASA Astrophysics Data System (ADS)

The role of horizontal deformation caused by pumping of confined-aquifer systems is recognized as contributing to the development of earth fissures in semiarid regions, including Las Vegas Valley, Nevada. In spite of stabilizing water levels, new earth fissures continue to develop while existing ones continue to lengthen and widen near basin-fill faults. A three-dimensional granular displacement model based on Biot's consolidation theory (Biot, MA, 1941, General theory of three-dimensional consolidation. Jour. Applied Physics 12:155-164) has been used to evaluate the nature of displacement in the vicinity of two vertical faults. The fault was simulated as (1) a low-permeability barrier to horizontal flow, (2) a gap or structural break in the medium, but where groundwater flow is not obstructed, and (3) a combination of conditions (1) and (2). Results indicate that the low-permeability barrier greatly enhances horizontal displacement. The fault plane also represents a location of significant differential vertical subsidence. Large computed strains in the vicinity of the fault may suggest high potential for failure and the development of earth fissures when the fault is assumed to have low permeability. Results using a combination of the two boundaries suggest that potential fissure development may be great at or near the fault plane and that horizontal deformation is likely to play a key role in this development. Résumé. On considère que la déformation horizontale provoquée par un pompage dans un aquifère captif joue un rôle dans le développement des fissures du sol en régions semi-arides, comme la vallée de Las Vegas (Nevada). Malgré des niveaux d'eau stabilisés, de nouvelles fissures du sol continuent de se développer en longueur et en largeur au voisinage de failles dans les bassins sédimentaires. Un modèle de déplacement granulaire tri-dimensionnel, basé sur la théorie de la consolidation de Biot (Biot, M A, 1941, General theory of three-dimensional consolidation. Jour. Applied Physics 12:155-164), a été utilisé pour évaluer la nature du déplacement au voisinage de deux failles verticales. La faille a été simulée comme 1) une barrière de faible perméabilité pour l'écoulement horizontal, 2) une rupture structurale dans le milieu, mais sans obstruction de l'écoulement, et 3) une combinaison des deux précédentes conditions. Les résultats indiquent que la barrière de faible perméabilité favorise fortement le déplacement horizontal. Le plan de faille constitue aussi un lieu de subsidence différentielle verticale significative. Les fortes contraintes calculées au voisinage de la faille laissent penser qu'il existe un fort potentiel de rupture et le développement de fissures du sol quand on suppose que la faille possède une faible perméabilité. Les résultats utilisant une combinaison des deux conditions suggèrent que le développement potentiel de fissures peut être grand sur ou à proximité du plan de faille et que la déformation horizontale joue vraisemblablement un rôle clé dans ce développement. Resumen. Se conoce la contribución que la deformación horizontal causada por el bombeo de sistemas acuíferos confinados tienen en el desarrollo de fisuras en regiones semiáridas, como es el caso del Valle de Las Vegas (Nevada, Estados Unidos de América). A pesar de la estabilización de los niveles, se continúa desarrollando nuevas fisuras, mientras las ya existentes se alargan y ensanchan cerca de las fallas de relleno de cuenca. Se ha utilizado un modelo tridimensional de desplazamiento granular basado en la teoría de consolidación de Biot (Biot, M.A., 1941. General theory of three-dimensional consolidation. J. Applied Physics, 12: 155-164) para evaluar la naturaleza del desplazamiento junto a dos fallas verticales. Se ha simulado cada falla como (1) una barrera de baja permeabilidad al flujo horizontal, (2) un hueco o ruptura estructural en el medio pero sin obstrucción al flujo de aguas subterráneas, y (3) una combinación de las dos condiciones anteriores. Los res

Burbey, Thomas

2002-07-01

348

The Evolutionarily Conserved Protein LAS1 Is Required for Pre-rRNA Processing at Both Ends of ITS2  

PubMed Central

Ribosome synthesis entails the formation of mature rRNAs from long precursor molecules, following a complex pre-rRNA processing pathway. Why the generation of mature rRNA ends is so complicated is unclear. Nor is it understood how pre-rRNA processing is coordinated at distant sites on pre-rRNA molecules. Here we characterized, in budding yeast and human cells, the evolutionarily conserved protein Las1. We found that, in both species, Las1 is required to process ITS2, which separates the 5.8S and 25S/28S rRNAs. In yeast, Las1 is required for pre-rRNA processing at both ends of ITS2. It is required for Rrp6-dependent formation of the 5.8S rRNA 3? end and for Rat1-dependent formation of the 25S rRNA 5? end. We further show that the Rat1-Rai1 5?-3? exoribonuclease (exoRNase) complex functionally connects processing at both ends of the 5.8S rRNA. We suggest that pre-rRNA processing is coordinated at both ends of 5.8S rRNA and both ends of ITS2, which are brought together by pre-rRNA folding, by an RNA processing complex. Consistently, we note the conspicuous presence of ?7- or 8-nucleotide extensions on both ends of 5.8S rRNA precursors and at the 5? end of pre-25S RNAs suggestive of a protected spacer fragment of similar length.

Schillewaert, Stephanie; Wacheul, Ludivine; Lhomme, Frederic

2012-01-01

349

The evolutionarily conserved protein Las1 is required for pre-rRNA processing at both ends of ITS2.  

PubMed

Ribosome synthesis entails the formation of mature rRNAs from long precursor molecules, following a complex pre-rRNA processing pathway. Why the generation of mature rRNA ends is so complicated is unclear. Nor is it understood how pre-rRNA processing is coordinated at distant sites on pre-rRNA molecules. Here we characterized, in budding yeast and human cells, the evolutionarily conserved protein Las1. We found that, in both species, Las1 is required to process ITS2, which separates the 5.8S and 25S/28S rRNAs. In yeast, Las1 is required for pre-rRNA processing at both ends of ITS2. It is required for Rrp6-dependent formation of the 5.8S rRNA 3' end and for Rat1-dependent formation of the 25S rRNA 5' end. We further show that the Rat1-Rai1 5'-3' exoribonuclease (exoRNase) complex functionally connects processing at both ends of the 5.8S rRNA. We suggest that pre-rRNA processing is coordinated at both ends of 5.8S rRNA and both ends of ITS2, which are brought together by pre-rRNA folding, by an RNA processing complex. Consistently, we note the conspicuous presence of ~7- or 8-nucleotide extensions on both ends of 5.8S rRNA precursors and at the 5' end of pre-25S RNAs suggestive of a protected spacer fragment of similar length. PMID:22083961

Schillewaert, Stéphanie; Wacheul, Ludivine; Lhomme, Frédéric; Lafontaine, Denis L J

2011-11-14

350

RE-LIVING LAS VEGAS: A multi-user, mixed-reality edutainment environment based on the enhancement of original archival materials  

Microsoft Academic Search

The article describes Re-Living Las Vegas, a project focused on the underrated, and often untold, history of Las Vegas and three of its casinos, Sands, Riviera and Stardust, between 1955 and 1965, the so-called golden music age of the city. The purpose of the project is to create a media-scalable system that can make historical archival materials free to be

Marco Antognozzi; Andrea Bottino; Aniello De Santi; Vittoria Lera; Marco Locatelli; Daniel Cook

2009-01-01

351

Mapping surface mineralogy and scattering behavior using backscattered reflectance from a hyperspectral midinfrared airborne CO 2 laser system (MIRACO2LAS)  

Microsoft Academic Search

Airborne, high-spectral resolution, thermal-infrared (TIR) MIRACO 2LAS reflectance data were evaluated for mapping surface mineralogy and scattering behavior for a variety of semi-arid, geological test sites in Australia. MIRACO2LAS is a rapidly tuned, airborne CO2 laser system that measures backscattered (bidirectional) reflectance at 100 wavelengths between 9.1 and 11.2 ?m for 2-m footprints in line profile mode. An operational methodology

Thomas J. Cudahy; Lewis B. Whitbourn; Philip M. Connor; Peter Mason; Richard N. Phillips

1999-01-01

352

Bioaccumulation and toxicity of 4-nonylphenol (4NP) and 4-(2-dodecyl)-benzene sulfonate (LAS) in Lumbriculus variegatus (Oligochaeta) and Chironomus riparius (Insecta)  

Microsoft Academic Search

The discharge of surfactants, such as 4-nonylphenol (4-NP) and linear alkylbenzene sulfonates (LAS), into water bodies leads to accumulation of the chemicals in the sediments and may thus pose a problem to benthic organisms. To study the bioaccumulation of surfactants, Oligochaeta worm Lumbriculus variegatus was exposed to sediment-spiked, [14C]-labeled 4-NP and 4-(2-dodecyl)-benzene sulfonate (C12-LAS) in three different sediments (S1–S3). The

K. Mäenpää; J. V. K. Kukkonen

2006-01-01

353

Aplicaciones prácticas de la fisiología de los herbicidas en las plantas  

NSDL National Science Digital Library

Esta lección se focaliza en el impacto de las características de la planta y el herbicida, importantes para determinar el desempeño del herbicida. Se usarán imágenes visuales para ilustrar varios principios, incluyendo el sitio de absorción del herbicida en la planta, transporte, el sitio de acción sensible, y efectos del ambiente sobre el desempeño del herbicida. Esta información provee la base para maximizar la utilidad del uso de los herbicidas.

354

Difusión de resultados iniciales del Estudio del Tamoxifeno y del Raloxifeno (STAR): el fármaco para el tratamiento de la osteoporosis, raloxifeno, es tan efectivo como el Tamoxifeno en la prevención de cáncer de seno invasor  

Cancer.gov

Los resultados iniciales del Estudio del Tamoxifeno y del Raloxifeno, STAR, demuestran que el fármaco raloxifeno, actualmente utilizado para prevenir y tratar la osteoporosis en mujeres posmenopáusicas, funciona tan bien como el tamoxifeno para reducir el riesgo de cáncer de seno entre las mujeres posmenopáusicas que tienen riesgo elevado de padecer la enfermedad. Preguntas y respuestas

355

Reavivando las Zonas Muertas de las Costas  

NSDL National Science Digital Library

The issue-focused, peer-reviewed article addresses how dead zones, or areas that cannot support life, are increasing along the coast due to: agricultural runoff and fertilizers industrial waste, and acid rain, which is produced by the burning of fossil fuels.

Robert Howarth (Cornell University;)

2000-09-01

356

On-road vehicle particulate matter and gaseous emission distributions in Las Vegas, Nevada, compared with other areas.  

PubMed

During the spring and summer of 2000, 2001, and 2002, gaseous and particulate matter (PM) fuel-based emission factors for approximately 150,000 low-tailpipe, individual vehicles in the Las Vegas, NV, area were measured via on-road remote sensing. For the gaseous pollutants (carbon monoxide, hydrocarbons, and nitrogen oxide), a commercial vehicle emissions remote sensing system (VERSS) was used. The PM emissions were determined using a Lidar-based VERSS. Emission distributions and their shapes were analyzed and compared with previous studies. The large skewness of the distributions is evident for both gaseous pollutants and PM and has important implications for emission reduction policies, because the majority of emissions are attributed to a small fraction of vehicles. Results of this Las Vegas study and studies at other geographical locations were compared. The gaseous pollutants were found to be close to those measured by VERSS in other U.S. cities. The PM emission factors for spark ignition and diesel vehicles are in the range of previous tunnel and dynamometer studies. PMID:15242151

Mazzoleni, Claudio; Kuhns, Hampden D; Moosmüller, Hans; Keislar, Robert E; Barber, Peter W; Robinson, Norman F; Watson, John G; Nikolic, Djordje

2004-06-01

357

An analysis of urban thermal characteristics and associated land cover in Tampa Bay and Las Vegas using Landsat satellite data  

USGS Publications Warehouse

Remote sensing data from both Landsat 5 and Landsat 7 systems were utilized to assess urban area thermal characteristics in Tampa Bay watershed of west-central Florida, and the Las Vegas valley of southern Nevada. To quantitatively determine urban land use extents and development densities, sub-pixel impervious surface areas were mapped for both areas. The urban-rural boundaries and urban development densities were defined by selecting certain imperviousness threshold values and Landsat thermal bands were used to investigate urban surface thermal patterns. Analysis results suggest that urban surface thermal characteristics and patterns can be identified through qualitatively based urban land use and development density data. Results show the urban area of the Tampa Bay watershed has a daytime heating effect (heat-source), whereas the urban surface in Las Vegas has a daytime cooling effect (heat-sink). These thermal effects strongly correlated with urban development densities where higher percent imperviousness is usually associated with higher surface temperature. Using vegetation canopy coverage information, the spatial and temporal distributions of urban impervious surface and associated thermal characteristics are demonstrated to be very useful sources in quantifying urban land use, development intensity, and urban thermal patterns. ?? 2006 Elsevier Inc. All rights reserved.

Xian, G.; Crane, M.

2006-01-01

358

Assessment of the potential toxicity of a linear alkylbenzene sulfonate (LAS) to freshwater animal life by means of cladoceran bioassays.  

PubMed

The acute and chronic toxic effects of LAS on the cladocerans Daphnia similis, Ceriodaphnia dubia and Ceriodaphnia silvestrii were tested. Both types of toxicity bioassays and the methods of culture and stock maintenance of the test organisms conformed to the recommendations of ABNT (Brazilian Society of Technical Standards), which closely follow the standard methods of USEPA. The results obtained for EC(50) (48 h) were: 14.17 mg L(-1) for D. similis, 11.84 mg L(-1) for C. dubia and 13.52 mg L(-1) for C. silvestrii. In the chronic toxicity tests performed on C. dubia and C. silvestrii, there was a significant decrease in the fecundity of the exposed animals; the value of NOEC for C. dubia and C. silvestrii were 1.00 mg L(-1) and 2.50 mg L(-1), respectively. Cladoceran bioassays provided evidence that LAS concentration as low as 1.00 mg L(-1) can damage invertebrate animal life in freshwaters, concentrations that can be found in many eutrophic rivers and reservoirs. PMID:20091119

Coelho, Katiuscia da Silva; Rocha, Odete

2010-01-21

359

Ethnobotany and antibacterial activity of some plants used in traditional medicine of Zapotitlán de las Salinas, Puebla (México).  

PubMed

The village of Zapotitlán de las Salinas is situated in the Valley of Tehuacán-Cuicatlán, Puebla, Mexico. Plant species used by the local inhabitants to treat gastrointestinal diseases were identified using ethnobotanical, ethnographic and taxonomic methods. Out of 119 interviews, 44 plant species were registered, of which the following are the most frequently used (listed in descending order): Lippia graveolens H.B. et K. (Verbenaceae), Lantana achyranthifolia Desf. (Verbenaceae), Turnera diffusa (Willd.) ex Schult. (Turneraceae), Lippia oaxacana Rob. et Greenm. (Verbenaceae), Gymnolaena oaxacana (Greenm.) Rydb. (Asteraceae), Cordia curassavica (Jacq.) Roem. et Schult. (Boraginaceae), Lantana camara L. (Verbenaceae) and Acalypha hederacea Torrey (Euphorbiaceae). From these plants, hexane, chloroform and ethanol extracts were prepared in order to assess their antibacterial activity against 14 bacterial strains causing the most common gastrointestinal diseases in Mexican population. All hexane extracts showed antibacterial activity against Gram-positive and Gram-negative bacteria. There is a correlation between the frequency of mention (of plant use) and the antibacterial activity. In conclusion, the knowledge of plants most frequently used for gastrointestinal infections in Zapotitlán de las Salinas is supported by scientific rationale. PMID:12963140

Hernández, T; Canales, M; Avila, J G; Duran, A; Caballero, J; Romo de Vivar, A; Lira, R

2003-10-01

360

Methodologies for selecting industries for regions and communities: A critical evaluation of the Las Vegas target industry analysis  

SciTech Connect

This report evaluates recent research conducted by a contractor for the state of Nevada. The research was designed to identify industries for which the Las Vegas area might provide competitive locations for new and expansion investment; it made use of target industry analysis (TIA) to identify specific industries that might be part of the future economy of the region and thus provide a baseline for assessing the impact of the Yucca Mountain repository project. This report briefly describes three TIA approaches - the conventional simple screening approach, simultaneous approach, and an alternative hybrid approach - and analytical hierarchy modeling, which is another industry selection methodology. It evaluates the data, methodology, and findings of the state of Nevada study, and it also discusses additional measures of locational advantage and economic development that were not considered in the study. The report then examines how industries search for new locations and reviews methodologies that assess the predictability of industries choosing particular locations. The report concludes that, although the state of Nevada study provides a general impression of industries likely to locate in the Las Vegas area, the relatively simplistic TIA approach it uses and the additional refinements still needed to make TIA an accurate predictor of future economic structure cast some doubt on the validity of the research findings.

Allison, T.

1992-03-01

361

Novel Inhibitors of the Pseudomonas aeruginosa Virulence Factor LasB: a Potential Therapeutic Approach for the Attenuation of Virulence Mechanisms in Pseudomonal Infection?†§  

PubMed Central

Pseudomonas elastase (LasB), a metalloprotease virulence factor, is known to play a pivotal role in pseudomonal infection. LasB is secreted at the site of infection, where it exerts a proteolytic action that spans from broad tissue destruction to subtle action on components of the host immune system. The former enhances invasiveness by liberating nutrients for continued growth, while the latter exerts an immunomodulatory effect, manipulating the normal immune response. In addition to the extracellular effects of secreted LasB, it also acts within the bacterial cell to trigger the intracellular pathway that initiates growth as a bacterial biofilm. The key role of LasB in pseudomonal virulence makes it a potential target for the development of an inhibitor as an antimicrobial agent. The concept of inhibition of virulence is a recently established antimicrobial strategy, and such agents have been termed “second-generation” antibiotics. This approach holds promise in that it seeks to attenuate virulence processes without bactericidal action and, hence, without selection pressure for the emergence of resistant strains. A potent inhibitor of LasB, N-mercaptoacetyl-Phe-Tyr-amide (Ki = 41 nM) has been developed, and its ability to block these virulence processes has been assessed. It has been demonstrated that thes compound can completely block the action of LasB on protein targets that are instrumental in biofilm formation and immunomodulation. The novel LasB inhibitor has also been employed in bacterial-cell-based assays, to reduce the growth of pseudomonal biofilms, and to eradicate biofilm completely when used in combination with conventional antibiotics.

Cathcart, George R. A.; Quinn, Derek; Greer, Brett; Harriott, Pat; Lynas, John F.; Gilmore, Brendan F.; Walker, Brian

2011-01-01

362

Gestación y trabajo: protocolización de la asistencia a la trabajadora embarazada en Salud Laboral. II. Protocolo de revisión médico-laboral de la trabajadora embarazada Pregnancy and work: occupational health procedure for pregnant women at work. II. Occupational health procedure for pregnant women  

Microsoft Academic Search

In this second section we propose a procedure to facili- tate the safety of the female worker during her pregnancy and breast feeding period. Therefore, based on the legal and scientific aspects discussed in the first section of this publi- cation, we present a guide for the analysis of a work station that gathers the different agents that can be

363

Effect of temperature and organic nutrients on the biodegradation of linear alkylbenzene sulfonate (LAS) during the composting of anaerobically digested sludge from a wastewater treatment plant.  

PubMed

Limits on the application of biosolids (anaerobically processed sludges from wastewater treatment plants) as fertilizers for the amendment of soil are becoming greater because of the accumulation of recalcitrant substances, making necessary the use of techniques that bring the concentration of xenobiotics to lower concentrations than those permitted. In general, the biosolids composting process is sufficient to reduce the usual concentration of linear alkylbenzene sulfonates (LAS) to low levels. In this work, an assessment is made on the effect of temperature in the capacity of enriched bacterial populations to biodegrade LAS, together with the influence that the available nutrients may have in the biodegradation of these compounds. The results show that the microbial metabolism of LAS was not observed in the thermophilic range. The optimum temperature for the biodegradation of LAS appears to be around 40 degrees C, this is, the lowest assayed here, and at this temperature the differences in the biodegradation of LAS among the nutritionally supplemented cultures are small. PMID:16298520

Sanz, E; Prats, D; Rodríguez, M; Camacho, A

2005-11-18

364

Heavy Metal Contamination and Salt Efflorescence Associated With Decorative Landscaping Rocks, Las Vegas, Nevada: The Need for Regulations  

NASA Astrophysics Data System (ADS)

Las Vegas, Nevada is one of the fastest growing cities in the United States. Faced with water restrictions, decorative rock xeroscaping has become a very popular form of landscaping. Currently, there are no regulations controlling the geochemistry of the decorative rocks that can be used for these purposes. In this study, we examined three sites containing two different decorative rock products. The landscaping rocks, underlying soil, and surface salt crusts were analyzed to determine their mineralogy and chemistry. Methods of analysis include scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP), thin section analysis, and laser particle size analysis (LPSA). Preliminary results indicate the presence of halite (NaCl), bloedite (Na2Mg(SO4)2 4H2O), a hydrated magnesium sulfate, and possibly copper sulfate and copper chloride mineral phases in the surface salt crusts. Both copper minerals are regarded as hazardous substances by the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA); these agencies have established minimum exposure limits for human contact with these substances. Copper sulfate and copper chloride are not naturally occurring minerals in the soils of the Las Vegas Valley, and analyses indicate that their formation may be attributed to the mineralogy of the decorative landscaping rocks. Further testing is needed to characterize this potential health hazard; however the preliminary results of this study demonstrate the need for regulations controlling the geochemistry of decorative rocks used for urban landscaping.

Mrozek, S. A.; Buck, B. J.; Brock, A. L.

2004-12-01

365

A preliminary assessment of earthquake ground shaking hazard at Yucca Mountain, Nevada and implications to the Las Vegas region  

SciTech Connect

As part of early design studies for the potential Yucca Mountain nuclear waste repository, the authors have performed a preliminary probabilistic seismic hazard analysis of ground shaking. A total of 88 Quaternary faults within 100 km of the site were considered in the hazard analysis. They were characterized in terms of their probability o being seismogenic, and their geometry, maximum earthquake magnitude, recurrence model, and slip rate. Individual faults were characterized by maximum earthquakes that ranged from moment magnitude (M{sub w}) 5.1 to 7.6. Fault slip rates ranged from a very low 0.00001 mm/yr to as much as 4 mm/yr. An areal source zone representing background earthquakes up to M{sub w} 6 1/4 = 1/4 was also included in the analysis. Recurrence for these background events was based on the 1904--1994 historical record, which contains events up to M{sub w} 5.6. Based on this analysis, the peak horizontal rock accelerations are 0.16, 0.21, 0.28, and 0.50 g for return periods of 500, 1,000, 2,000, and 10,000 years, respectively. In general, the dominant contributor to the ground shaking hazard at Yucca Mountain are background earthquakes because of the low slip rates of the Basin and Range faults. A significant effect on the probabilistic ground motions is due to the inclusion of a new attenuation relation developed specifically for earthquakes in extensional tectonic regimes. This relation gives significantly lower peak accelerations than five other predominantly California-based relations used in the analysis, possibly due to the lower stress drops of extensional earthquakes compared to California events. Because Las Vegas is located within the same tectonic regime as Yucca Mountain, the seismic sources and path and site factors affecting the seismic hazard at Yucca Mountain also have implications to Las Vegas. These implications are discussed in this paper.

Wong, I.G.; Green, R.K.; Sun, J.I. [Woodward-Clyde Federal Services, Oakland, CA (United States); Pezzopane, S.K. [Geological Survey, Denver, CO (United States); Abrahamson, N.A. [Abrahamson (Norm A.), Piedmont, CA (United States); Quittmeyer, R.C. [Woodward-Clyde Federal Services, Las Vegas, NV (United States)

1996-12-31

366

Systems dynamic model to forecast salinity load to the Colorado River due to urbanization within the Las Vegas Valley.  

PubMed

This study evaluates the impact of urban growth in the Las Vegas Valley (LVV), Nevada, USA on salinity of the Colorado River. In the past thirty eight years the LVV population has grown from 273,288 (1970) to 1,986,146 (2008). The wastewater effluents and runoff from the valley are diverted back to the Colorado River through the Las Vegas Wash (LVW). With the growth of the valley, the salinity released from urban areas has increased the level of TDS in the wastewater effluents, ultimately increasing the TDS in the Colorado River. The increased usage of water softeners in residential and commercial locations is a major contributor of TDS in the wastewater effluents. Controlling TDS release to the Colorado River is important because of the 1944 Treaty signed between the USA and Mexico. In addition, the agriculture salinity damage cost for the Colorado River has been estimated to be more than $306 a million per year using 2004 salinity levels. With the expected growth of LVV in coming years the TDS release into Lake Mead will increase over time. For this purpose, it is important to investigate future TDS release into the Colorado in anticipation of potential TDS reducing measures to be adopted. In this research, a dynamic simulation model was developed using system dynamics modeling to carry out water and TDS mass balances over the entire LVV. The dynamic model output agreed with historic data with an average error of 2%. Forecasts revealed that conservation efforts can reduce TDS load by 16% in the year 2035 when compared to the current trend. If total population using water softeners can be limited to 10% in the year 2035, from the current 30% usage, TDS load in the LVW can be reduced by 7%. PMID:21514626

Venkatesan, Arjun K; Ahmad, Sajjad; Johnson, Walter; Batista, Jacimaria R

2011-04-22

367

Seguridad alimentaria para futuras mamás: Durante el ...  

Center for Food Safety and Applied Nutrition (CFSAN)

... Datos: Aproximadamente el 85% de las mujeres embarazadas en los EE.UU. está en riesgo de padecer toxoplasmosis. (American Journal of ... More results from www.fda.gov/food/foodborneillnesscontaminants/peopleatrisk

368

Cambios en el seno y el riesgo de desarrollar cáncer  

Cancer.gov

Hoja informativa acerca de los diversos cambios en los senos que experimentan las mujeres. Contiene información general sobre los métodos usados para distinguir entre cambios benignos y cambios que pueden ser cancerosos.

369

Ternary lanthanum sulfide selenides ?-LaS2-xSex (0  

NASA Astrophysics Data System (ADS)

Mixed lanthanum sulfide selenides LaS2-xSex (0LaS2-xSex compounds crystallize in space group P21/a, no. 14, and adopt the ?-LnS2 (Ln=Y, La-Lu) structure type with a pronounced site preference for the chalcogen atoms. The mixed chalcogenides form a complete miscible series with lattice parameters a=820-849 pm, b=413-425 pm and c=822-857 pm (??90°) following Vegard’s rule. Raman signals indicate the presence of mixed X22- dianions, a species rarely evidenced in literature, besides the well known anions S22- and Se22-. The band gaps of the LaS2-xSex compounds, determined by optical spectroscopy, decrease nearly linearly with increasing amount of selenium.

Bartsch, Christian; Doert, Thomas

2012-01-01

370

Log ASCII Standard (LAS) Files for Geophysical (Gamma Ray) Wireline Well Logs and Their Application to Geologic Cross Section C-C' Through the Central Appalachian Basin  

USGS Publications Warehouse

U.S. Geological Survey (USGS) regional geologic cross section C-C' (Ryder and others, 2008) displays key stratigraphic intervals in the central Appalachian basin. For this cross section, strata were correlated by using descriptions of well cuttings and gamma ray well log traces. This report summarizes the procedures used to convert gamma ray curves on paper well logs to the digital Log ASCII (American Standard Code for Information Interchange) Standard (LAS) format using the third-party software application Neuralog. The procedures could be used with other geophysical wireline logs also. The creation of digital LAS files from paper well logs by using Neuralog is very helpful, especially when dealing with older logs with limited or nonexistent digital data. The LAS files from the gamma ray logs of 11 wells used to construct cross section C-C' are included in this report. They may be downloaded from the index page as a single ZIP file.

Trippi, Michael H.; Crangle, Robert D., Jr.

2009-01-01

371

Paradoxes, Protests and the Mujeres de Negro of Northern Mexico  

Microsoft Academic Search

On November 25, 2002, thousands of people marched through the streets of Mexico City and demanded, in the name of social justice, an end to the violence against women in northern Mexico. ‘Ni Una Más’ (not one more) was their chant and is also the name of their social justice campaign. Their words referred to the hundreds of women and

Melissa W. Wright

2005-01-01

372

La mujer en la astronomía: pasado y presente  

Microsoft Academic Search

There exists a long and honorable tradition of participation of women in astronomy, affording many significant contributions to the field. Historically, however, many of these contributions have remained ignored, or recorded under the names of husbands, brothers or bosses. The present report includes an historical perspective, summarizing some of the most signicant contributions done along the last three centuries by

G. Dubner

1998-01-01

373

Mujeres de mucha monta’: Women expressing their erotic desires  

Microsoft Academic Search

The collection of short stories analysed here may not become a classic in Latin American literature; but it has certainly caused great upheaval within the Uruguayan context. Uruguayan women's literature has had a well known precedent of erotic expression in the controversial poet Delmira Agustini and some contemporary representatives such as Teresa Porzecanski, Helena Corbellini and Andrea Blanqué, but never

Estela Valverde

2004-01-01

374

La mujer en la astronomía: pasado y presente  

NASA Astrophysics Data System (ADS)

There exists a long and honorable tradition of participation of women in astronomy, affording many significant contributions to the field. Historically, however, many of these contributions have remained ignored, or recorded under the names of husbands, brothers or bosses. The present report includes an historical perspective, summarizing some of the most signicant contributions done along the last three centuries by female astronomers. Briefly: Catherina Hevelius (1646-1693), author of the largest and last stars catalog made without the aid of a telescope; Nicole-Reine Lepaute (1723-1788) extraordinary mathematician who predicted the path of Halley's Comet in 1757; Caroline Herschel (1750-1848) assistant of her brother William, discovered 8 comets, reduced the positions to a common epoch and published the catalog of 2500 nebulae observed by her brother, was elected honorary member of the Royal Astronomical Society (RAS); Maria Mitchell (1818-1889), professor of astronomy and director of the Vassar College Observatory, dedicated her life to women's education; Williamina Fleming (1857-1911)discovered 94 of the 107 Wolf-Rayet stars known at her time, the bulk of the first HD catalog was based on her spectral types classification; Annie Cannon (1863-1941) examined and classified nearly 500.000 stars, rearranged Fleming's spectral system, defining the OBAFGKM series; Henrietta Swan Leavitt (1868-1921) worked cataloging variable stars, discovered the period-luminosity relations in Cepheids; Cecilia Payne-Gaposhkin combined observations with theory to obtain a temperature scale for Cannon's spectral types; Ruby Payne-Scott (1912-1981), the first female radioastronomer in the world, developed the theory of aperture synthesis, in which most of the larger radio interferometers are based. The present trends are analized based on statistics of the International Astronomical Union (IAU): women represent 11.8% of the total of IAU members; in Argentina the percentage is 33.3%, the highest among countries with more than one member. Based on studies carried out by the American Astronomical Society (AAS) (Boyce 1993) it is concluded that there is virtually no difference in the productivity of men and women. Papers, however, receive different rate depending on the gender of the author (Billard 1993). In CONICET (Argentina), based on studies carried out by the Network of Gender, Science and Technology (for all sciences), it is concluded that even when women are majority in the lower categories, the female percentage rapidly decay for higher categories, suggesting than gender facts may be biasing promotions. Most of these data are taken from Mercury XXI, No. 1, 1992

Dubner, G.

375

Infección por VPH en mujeres con artritis reumatoide  

Microsoft Academic Search

Background: Human papillomavirus (HPV) is the main risk factor for the development of cervical cancer, which remains the most com- mon malignancy in our country. There are studies in which immunosuppressed patients have an increased risk of suffering an infection by HPV. Objective: To determine the prevalence of HPV infection in patients with rheumatoid arthritis (RA) compared with women matched

Diana E Flores Alvarado; Rocío Ortiz López; Mario Alberto; Garza Elizondo; Jacqueline Rodríguez Amado; Brenda R Vázquez Fuentes; Anajulia González Betancourt

376

Retinol sérico en mujeres mexicanas urbanas durante el periodo perinatal  

Microsoft Academic Search

Objective. To establish the prevalence of vitamin A defi- ciency during pregnancy and lactation in a group of urban Mexican women. Material and methods. A group of preg- nant women who attended a prenatal care program were invited to participate. Subjects had no added pathologies and were less than 20 weeks pregnant. Evaluations were performed 3 times during pregnancy until

Esther Casanueva; Roxana Valdés-Ramos; Frania Pfeffer; Arlene Ricalde-Moreno; Elsy García-Villegas; Carlos Meza

1999-01-01

377

CharacteriStics and utilization of midwives in a selected rural area of East Pakistan  

Microsoft Academic Search

\\u000a Resumen  El propósito de este estudio [ue el de obtener información ocerca de la utilización de porieras por parte de las mujeres del\\u000a pueblo y conocer más acerca de las características y pradicas de esas parteros.\\u000a \\u000a \\u000a Se prepararon doe formularios para entrevista; el primero fue usado para encuestar 632 mujeres del pueblo y determinar por\\u000a quien fueron asistidas en sus dos

H. T. Croley; S. Z. Haider; Sultana Begum; Harold C. Gustafson

1966-01-01

378

Full House: The Las Vegas building boom has stretched the creativity and resources of the fastest-growing school district in the nation. Edutopia, September/October 2004  

ERIC Educational Resources Information Center

|This once sleepy community, founded by Mormon missionaries in 1855 and jumpstarted by gambling 85 years later, now gobbles up real estate faster than a conventioneer chowing down at a midnight buffet. Every day of the week, two acres of Las Vegas area land are developed for commercial or residential use in a frenetic drive to accommodate the…

Furger, Roberta

2004-01-01

379

Diseño de un procedimiento en pruebas de cumplimiento para la actividad de supervisión o monitoreo en las áreas de producción de la empresa provincial de la industria alimenticia  

Microsoft Academic Search

El desarrollo de la economía impone exigencias a las industrias; medidas en términos de producción y calidad, por lo que cobra gran importancia la implementación de un procedimiento para organizar, planificar, dirigir y fiscalizar la actividad de supervisión a lo largo de todo el proceso, y no después de elaborado el producto, lo que puede resultar muy costoso. En la

Yolanda Ramona Pons Rodríguez

2011-01-01

380

Una nueva especie de Euglena (Euglenozoa: Euglenales) aislada de ambientes extremófilos en las Pailas de Barro del Volcán Rincón de la Vieja, Costa Rica  

Microsoft Academic Search

A new species of euglena isolated from a hot and acid mud pool located in Las Pailas de Barro, Volcán Rincón de la Vieja, Costa Rica is described. This species inhabits hot and acid environments. Euglena pailasen- sis sp. nov. main features are: the absence of flagella, the presence filaments like \\

Ana Sittenfeld; Maribelle Vargas; Ethel Sánchez; Marielos Mora; Aurelio Serrano

381

APLICACIÓN DE LAS DIFERENCIAS FINITAS PARA EL FLUJO DE CONTAMINANTES EN EL ACUÍFERO DE AYAMONTE APPLICATION OF FINITE DIFFERENCES FOR POLLUTANTS FLOW IN THE AYAMONTE WATER BEARER  

Microsoft Academic Search

RESUMEN Si planteamos un modelo para el flujo de aguas subterráneas en un acuífero, implícitamente se modeliza el flujo de contaminantes móviles disueltos; teniendo en cuenta esta premisa, nuestro análisis del flujo de contaminan- tes en el acuífero de Ayamonte quedará representada en el estudio del flujo de las aguas subterráneas en un medio hidrogeológico estable y uniforme, condiciones que

Alfonso Romero Baylón; Daniel Lovera Dávila

382

Lysossomal Membrane Stability of the brown mussel Perna perna (Linnaeus) (Mollusca, Bivalvia) exposed to the anionic surfactant Linear Alkylbenzene Sulphonate (LAS)  

Microsoft Academic Search

The effects of the Linear Alkylbenzene Sulphonate (LAS) were evaluated on the mussel Perna perna (Linnaeus, 1758), using a cellular level biomarker. The Neutral Red Retention Time (NRRT) assay was used to estimate effects at cellular levels. Significant effects were observed for the NRRT assay, even in low concentrations. The effects at cellular level were progressive, suggesting that the organisms

MARINA F. STEFANONI; DENIS M. S. ABESSA

2008-01-01

383

A McOndo Writer's Take on Literature in the Era of Audiovisual and Digital Communication: The Case of Alberto Fuguet's "Las Peliculas de mi vida"  

ERIC Educational Resources Information Center

|Alberto Fuguet, one of the leaders of the McOndo writers who seek cultural direction from the United States and exploit mass-media formulas, is a polarizing figure in contemporary Latin American culture. His most recent full-length novel, the semi-autobiographical "Las peliculas de mi vida" (2003), has led many to conclude that Fuguet is simply a…

Maier, Linda S.

2011-01-01

384

Project EXCEL (Experience-Based Education Learning Program) of the Las Cruces Public Schools. Evaluation Report for the 1976-77 School Year.  

ERIC Educational Resources Information Center

|Patterned after the Appalachia Educational Laboratory program model, the experience-based career education (EBCE) Project EXCEL was evaluated for its effectiveness after one semester of implementation. Project EXCEL (Experienced-Based Career Education and Learning Program) was implemented in Las Cruces, New Mexico, and was designed to provide an…

Far West Lab. for Educational Research and Development, San Francisco, CA.

385

Estimating the economic impacts of a hub airline serving a tourist destination: the case of america west airlines and las vegas, nevada  

Microsoft Academic Search

Airlines are an important component of regional economies. The economic impact of an airline goes beyond the usual impacts of their payroll and expenditures. Airlines also may affect business productivity and the critical economic base of a regional economy. This article estimates the economic impact of America West Airlines on Las Vegas, Nevada. Key aspects of the study were measurement

John H. Brown; Thomas M. Carroll; Dan S. Rickman; R. Keith Schwer

1995-01-01

386

A McOndo Writer's Take on Literature in the Era of Audiovisual and Digital Communication: The Case of Alberto Fuguet's "Las Peliculas de mi vida"  

ERIC Educational Resources Information Center

Alberto Fuguet, one of the leaders of the McOndo writers who seek cultural direction from the United States and exploit mass-media formulas, is a polarizing figure in contemporary Latin American culture. His most recent full-length novel, the semi-autobiographical "Las peliculas de mi vida" (2003), has led many to conclude that Fuguet is simply a…

Maier, Linda S.

2011-01-01

387

40 CFR 51.917 - What is the effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area?  

Code of Federal Regulations, 2013 CFR

...NV, 8-hour ozone nonattainment area? 51.917 Section 51.917 Protection of Environment...Ambient Air Quality Standard § 51.917 What is the effective date...NV, 8-hour ozone nonattainment area? The Las Vegas, NV,...

2013-07-01

388

Risk-induced social impacts: The effects of the proposed nuclear waste repository on residents of the Las Vegas metropolitan area  

Microsoft Academic Search

This report examines important and major impacts of the proposed high-level nuclear waste repository on Las Vegas metropolitan residents. The data utilized in the report consist of interview data collected in the 1988, Urban Risk Survey and data for Clark County residents collected as part of the 1989 Nevada Telephone Survey. The use of two different data sets which were

Alvin H. Mushkatel; K. David Pijawka; Marilyn Dantico

1990-01-01

389

Full House: The Las Vegas building boom has stretched the creativity and resources of the fastest-growing school district in the nation. Edutopia, September/October 2004  

ERIC Educational Resources Information Center

This once sleepy community, founded by Mormon missionaries in 1855 and jumpstarted by gambling 85 years later, now gobbles up real estate faster than a conventioneer chowing down at a midnight buffet. Every day of the week, two acres of Las Vegas area land are developed for commercial or residential use in a frenetic drive to accommodate the…

Furger, Roberta

2004-01-01

390

Captura y Reconfiguración Cooptada del Estado en Guatemala, México y Colombia Análisis conceptual de las memorias de la Primera Discusión Internacional Sobre Captura y Reconfiguración Cooptada del Estado  

Microsoft Academic Search

La evidencia muestra que el narcotráfico es importante en el fortalecimiento de la corrupción de Guatemala, México y Colombia; por lo tanto, es problemático analizar de modo separado ambos fenómenos. Los hechos muestran también que las organizaciones narcotraficantes de los tres países han aprendido a regular la coerción del Estado. Este aprendizaje ha representado un salto que va desde la

Luis Jorge Garay-Salamanca; Isaac de León-Beltrán; Eduardo Salcedo-Albarán

2010-01-01

391

Contributions to the Study of Cultural Resources: Archaeology of the Old Spanish Trail/Mormon Road from Las Vegas, Nevada to the California Border.  

National Technical Information Service (NTIS)

A portion of the Old Spanish Trail/Mormon Road from Las Vegas to the California border was intensively examined by BLM archaeologists between 1987 and 1989. Historic research indicates that the trail was forged in 1844 and utilized as an immigration route...

K. Myhrer W. G. White S. D. Rolf

1990-01-01

392

A Successful Program for Women Faculty and Graduate Students in Natural Sciences, Mathematics, and Engineering at the University of Nevada, Las Vegas.  

ERIC Educational Resources Information Center

Introduces a program initiated at the University of Nevada, Las Vegas to stimulate the retention and promotion of women scientists, mathematicians, and engineers and support women graduate students in the same fields. Results of the program suggest that such initiatives can increase the number of women in science, mathematics, and engineering.…

Rees, Margaret N. (Peg); Amy, Penny; Jacobson, Ellen; Weistrop, Donna E.

2000-01-01

393

BEA Annual Convention: A Look Back at BEA 97 and Preparing for BEA 98, April 3-6, Las Vegas, Nevada.  

ERIC Educational Resources Information Center

The 42nd annual Broadcast Education Association (BEA) Convention ("Reinventing Electronic Media: Multimedia in the New Millennium") for electronic media educators was held April 3-6, 1997 in Las Vegas, Nevada. This article outlines events at the 1997 convention and provides a "sneak peek" at planning for the 1998 convention, "Electronic Media:…

Feedback, 1997

1997-01-01

394

A rich community of Felidae (Mammalia, Carnivora) from the late Miocene (Turolian, MN 13) site of Las Casiones (Villalba Baja, Teruel, Spain)  

Microsoft Academic Search

Several new fossil remains of Felidae from the late Miocene (Turolian age, MN 13, local zone M2) locality of Las Casiones (near the village of Villalba Baja, Teruel, Spain) are studied in the present paper. This felid community includes the machairodontines Amphimachairodus giganteus, Paramachaerodus orientalis, and Metailurus major, and the felines Pristifelis attica and a small, undetermined species, previously unknown

Manuel J. Salesa; María Dolores Pesquero; Gema Siliceo; Mauricio Antón; Luis Alcalá; Jorge Morales

2012-01-01

395

Correlación entre la estructura de bandas y las propiedades físicas de óxidos cerámicos de estructura perovskita con metales de transición (I): Propiedades de conducción electrónica  

Microsoft Academic Search

En este artículo se revisa los principales modelos teóricos, que pretenden dar una explicación sobre las propiedades de con- ducción electrónica de óxidos cerámicos con estructura perovskita, que incluyen en la posición B metales de transición del primer período (Fe, Co, Ni, Mn), en conexión con su estructura de bandas y el carácter de sus electrones más externos, así como

L. SÁNCHEZ; J. R. JURADO

396

Six month progress report on the Waste Package Project at the University of Nevada, Las Vegas, July 1991--January 1992: Management, quality assurance and overview  

SciTech Connect

The progress of the waste package project at the University of Nevada, Las Vegas was the subject of this report. It covered aspects of management and quality assurance, container design, application of ASME Pressure Vessel Codes, structural analysis of containers, design of rock tunnels for storage, and heat transfer phenomena. (MB)

Ladkany, S.G.

1991-01-01

397

Six month progress report on the Waste Package Project at the University of Nevada, Las Vegas, July 1991--January 1992: Management, quality assurance and overview  

SciTech Connect

The progress of the waste package project at the University of Nevada, Las Vegas was the subject of this report. It covered aspects of management and quality assurance, container design, application of ASME Pressure Vessel Codes, structural analysis of containers, design of rock tunnels for storage, and heat transfer phenomena. (MB)

Ladkany, S.G.

1991-12-31

398

PROCEEDINGS OF THE NATIONAL GROUND WATER QUALITY SYMPOSIUM (3RD) HELD IN LAS VEGAS, NEVADA ON SEPTEMBER 15-17, 1976  

EPA Science Inventory

The Third National Ground Water Quality Symposium was held in Las Vegas, September 15-17, 1976, in conjunction with the annual convention of the National Water Well Association. There were eight main sessions encompassing twenty-four technical papers. These were concerned with th...

399

Educar haciendo uso de las nuevas tecnologías y medios digitales. Algunas pautas básicas. Educating using new technologies and digital media. Some basic guidelines  

Microsoft Academic Search

Las nuevas tecnologías y los medios digitales plantean nuevas posibilidades educativas, dando paso a lo que se conoce como e-learning. Sin embargo, contar con estos medios no garantiza sin más el conseguir los mejores resultados de aprendizaje, pues también se requiere la implantación paralela de nuevos modelos pedagógicos. Estos modelos afectarán tanto al diseño de los materiales educativos en formato

Ana M; Fermoso García; Alberto Pedrero

400

PA01.43. In-vitro cyto chemical & flow-cytometry studies with las02- a coded herbo-mineral compound  

PubMed Central

Purpose: The drug optimization and understanding the mechanisms of action of drugs on the deregulation of cell cycle which is frequently considered as the cause of progression in cancer can provide important insights for new cancer treatment strategies. The drug LAS02 is a herbo mineral drug prepared as per ancient Ayurvedic literature. Method: In this study the effect of LAS02 was studied by analyzing the effect on cell cycle by flow cytometery on cancer cell lines breast cancer (MCF7), cervical cancer (HELA), colon cancer (COLO 205) and prostate cancer (DU 145), procured from NCCS, Pune. The cells were treated by different doses of LAS02, and assay for proliferation was performed by MTT assay test, subsequently, these were analyzed by flow cytometer for cell cycle analysis. Result: The results showed inhibition of proliferation in MCF7 by 77% and HELA cells by 78% at dose of 500?g/ml in MTT assay. In cell cycle analysis for COLO 205 treated with LAS02, the percentage retention of the cells in G0/ G1 phase was 73.07% at 300?g/ml as compared to 52.16% in the control after 24hrs. In DU 145, treated with LAS02, cells that retained at G0/G1 phase were 79.28% at a dose of 400?g/ml after 48hrs; as compared to control of 62.41%. The apoptosis observed at 400?g/ml drug concentration was 43.51%. Conclusion: The study shows that LAS02 acts as a potent anti cancerous compound by inhibiting proliferation as well as by inducing retention of cells in G0/G1 phase along with apoptosis significantly at in vitro level. Therefore, LAS02 arrests the cancerous cells in G0/G1 phase and prevented the entry of pre cancerous stem cells from G0/G1 phase into G2, the subsequent proliferative stage and inhibits cancer cells from completing the cell cycle. Such a finding is unique with this new drug, which holds a great promise as one of the most effective and safest cancerostatic drug.

Asthana, Aditi; Saxena, R C; Singh, Vandana; Sharma, Vinamra; Srivastava, Ashok; Trivedi, V. P.

2012-01-01

401

Abundance Results from the Las Campanas Observatory and McDonald Observatory High-Resolution Metal-Poor Star Survey  

NASA Astrophysics Data System (ADS)

We have undertaken a survey to collect high-resolution and high S/N spectra for more than 300 metal-poor stars. The majority of our sample was selected from the HK Survey of Beers, Preston, and Shectman, and nearly all stars with estimated [Fe/H] < -2.5 have been observed with the MIKE spectrograph on the Magellan-Clay Telescope at Las Campanas Observatory. Additional metal-poor targets were selected based on their kinematic properties and observed with the Tull spectrograph on the Smith Telescope at McDonald Observatory. Previous abundance analyses based on high-resolution and high S/N spectra have been performed for only about 20% of the sample. While this sample naturally allows us to reconfirm and expand upon previously-detected low metallicity abundance trends and identify new stars with unique abundance signatures, its real power is the ability to probe chemical dispersion in abundance ratios. We exploit this attribute by performing line-by-line differential abundance analyses for many elements in large numbers of stars at a single metallicity and evolutionary state. This allows us to assess the evolution of the cosmic scatter of the chemistry of the ISM at very early times in the halo of the Galaxy. Generous funding has been provided by the U.S. National Science Foundation (grant AST 09-08978 to C.S.).

Roederer, Ian U.; Preston, G.; Shectman, S.; Thompson, I.; Sneden, C.

2011-01-01

402

Characterization and prediction of spatial variability of unsaturated hydraulic properties in a field soil: Las Cruces, New Mexico  

SciTech Connect

A 91-m transect was set up in an irrigated field near Las Cruces, New Mexico to investigate the spatial variability of unsaturated soil properties. A total of 455 sampling points were monitored along a grid consisting of 91 stations placed 1 m apart by 5 depths per station. Post-irrigation soil water tension and water content measurements were recorded over 45 days at 11 time periods. The instantaneous profile was used to estimate the unsaturated hydraulic conductivity at the 455 sampling points. Fifty soil samples were also taken for analyzing sand, silt, and clay content distributions. The spatial and temporal variability of soil water tension and water content were investigated along with the spatial variability of parameters of an unsaturated hydraulic conductivity model. Results of the analysis show that spatial variation in soil water tension and water content is consistent with the soil texture spatial variability. In addition, the spatial distribution of the estimated parameter value of unsaturated hydraulic conductivity reflects the soil texture distribution. Using the statistics of the estimated hydraulic parameter values, a stochastic soil water tension model was employed to reproduce the variability of observed soil water tension. Although many assumptions were made, the results of the simulation appear promising.

Yeh, T.C.J.; Greenholtz, D.E. (Arizona Univ., Tucson, AZ (United States). Dept. of Hydrology and Water Resources); Nash, M.S. (New Mexico State Univ., Las Cruces, NM (United States). Dept. of Crop and Soil Sciences); Wierenga, P.J. (Arizona Univ., Tucson, AZ (United States). Dept. of Soil and Water Science)

1991-01-01

403

Characterization and prediction of spatial variability of unsaturated hydraulic properties in a field soil: Las Cruces, New Mexico  

SciTech Connect

A 91-m transect was set up in an irrigated field near Las Cruces, New Mexico to investigate the spatial variability of unsaturated soil properties. A total of 455 sampling points were monitored along a grid consisting of 91 stations placed 1 m apart by 5 depths per station. Post-irrigation soil water tension and water content measurements were recorded over 45 days at 11 time periods. The instantaneous profile was used to estimate the unsaturated hydraulic conductivity at the 455 sampling points. Fifty soil samples were also taken for analyzing sand, silt, and clay content distributions. The spatial and temporal variability of soil water tension and water content were investigated along with the spatial variability of parameters of an unsaturated hydraulic conductivity model. Results of the analysis show that spatial variation in soil water tension and water content is consistent with the soil texture spatial variability. In addition, the spatial distribution of the estimated parameter value of unsaturated hydraulic conductivity reflects the soil texture distribution. Using the statistics of the estimated hydraulic parameter values, a stochastic soil water tension model was employed to reproduce the variability of observed soil water tension. Although many assumptions were made, the results of the simulation appear promising.

Yeh, T.C.J.; Greenholtz, D.E. [Arizona Univ., Tucson, AZ (United States). Dept. of Hydrology and Water Resources; Nash, M.S. [New Mexico State Univ., Las Cruces, NM (United States). Dept. of Crop and Soil Sciences; Wierenga, P.J. [Arizona Univ., Tucson, AZ (United States). Dept. of Soil and Water Science

1991-12-31

404

Characteristics of Combined Submerged Membrane Bioreactor with Granular Activated Carbon (GAC) in Treating Lineal Alkylbenzene Sulphonates (LAS) Wastewater  

NASA Astrophysics Data System (ADS)

A combined MBR (cMBR) with granular activated carbon (GAC) was used as a backbone system to treat the synthetic lineal alkylbenzene sulphonates (LAS) wastewater. The GAC was added in the MBR to improve the resistance of membrane fouling. A parallel conventional MBR (pMBR) without the GAC was run to give a contrast. The results of the process demonstrate that the cMBR process was more efficient than pMBR. It was found that the TMP changes of the cMBR were slower than the pMBR. The results demonstrated that the cMBRs membrane was better than the pMBR's after a clean period run. It was the GAC scrubbing to the membrane that delayed the membrane fouling of the cMBR. Variable critical flux was found in MBR, which showed that the cMBR could make the critical flux better than pMBR in the run time, but GAC could not improve the critical flux at the end of the period for the severe membrane fouling. Based on this theory, a variable critical flux (J) of MBR was put forward, and the relationship of J with time (t) was: J = 16.081e-0.0177t.

Guo, Jifeng; Xia, Siqing; Lu, Yanjun

2010-11-01

405

Simultaneous measurement of sphericity and scattering phase functions from single atmospheric aerosol particles in Las Cruces, NM  

NASA Astrophysics Data System (ADS)

We report upon the collection of elastic light scattering patterns with high angular resolution and large angular coverage from single atmospheric aerosol particles in Las Cruces, NM. Radiative forcing due to aerosols is a primary source of uncertainty in climate models. Characterization of tropospheric aerosols is carried out by inversion of optical measurements made remotely by land-based instruments and satellites. An integral part of the retrieval procedure is accounting for particle shape (i.e. nonsphericity). In-situ and laboratory measurements of aerosol particles play a critical role in validating and constraining the inversion procedure used in climate models. In this work, we utilize high angular resolution and large angular coverage scattering patterns to simultaneously calculate particle sphericity and the scattering phase of individual atmospheric particles. We examine the relationship between a particle's sphericity and its phase function. In addition, we explore the differences in phase function between nonspherical particles that have high sphericity (i.e. complex particles with overall round shape) and spherical particles. We conclude by commenting on the possible impacts of our findings on inversion procedures used in aerosol characterization.

Martin, Sean; Aptowicz, Kevin; Pan, Yong-Le; Chang, Richard; Pinnick, Ronald

2013-03-01

406

1.4 GHz luminosity function of galaxies in the Las Campanas redshift survey and its evolution  

NASA Astrophysics Data System (ADS)

The sample of 1157 radio-identified galaxies from the Las Campanas Redshift Survey (LCRS) (Machalski & Condon 1999) is used to derive the 1.4 GHz luminosity functions of both star-forming (starburst) galaxies with the mean redshift ? 0.07, and AGN- type ones with ? 0.18. These functions are used as a direct measure of their evolution inferred from the evolutionary models of the entire population of radio sources. Comparing these measured functions with the corresponding local luminosity functions determined by Condon (1989) and Cotton & Condon (1998), we found that assuming the `translation evolution' form of Condon (1984) (also Saunders et al. 1990), the amount of luminosity and/or density evolution in the LCRS sample is of the same order as the uncertainty in determination of the local functions, although the data available do not exclude mild evolution at the rate predicted by the evolutionary models. The above is supported by the starburst-type and AGN-type LCRS galaxies from the bright part of their luminosity functions which produce a spectral power density evidently higher than corresponding UGC galaxies, though the spatial densities of these UGC and LCRS galaxies are comparable. This is consistent with luminosity evolution of galaxies, at least those very luminous within their type.

Machalski, J.; Godlowski, W.

2000-08-01

407

Estimation of spatio-temporal recharge of aquifers in mountainous karst terrains: Application to Sierra de las Nieves (Spain)  

NASA Astrophysics Data System (ADS)

We describe a method for estimating the daily, spatially distributed recharge of aquifers in mountainous karst terrains using a water balance. Water recharge into an aquifer is a highly variable process over both time and space. Many methods have been developed to assess aquifer recharge although most have been applied to detrital aquifers. Many karst aquifers, especially in Mediterranean areas, occur in mountainous environments where rainfall and evapotranspiration can vary considerably over space and time and where there are usually few rainfall and temperature monitoring stations. We have used an advanced geostatistical method to estimate daily rainfall and temperature. The method involves kriging with an external drift using a climatological semi-variogram model inferred by modified maximum-likelihood. The depth of the soil-epikarst layer is estimated from remote sensing and terrain analysis data together with field observations and electrical resistivity tomography. Because of the karst nature of the mountainous terrain, concentrated infiltration is allowed for in some places. The parameters are calibrated against the cumulative discharge of various springs. The method is illustrated by a case study of the Sierra de las Nieves aquifer in the mountainous karst region of southern Spain.

Pardo-Igúzquiza, E.; Durán-Valsero, J. J.; Dowd, P. A.; Guardiola-Albert, C.; Liñan-Baena, C.; Robledo-Ardila, P. A.

2012-11-01

408

Estudio comparativo de las moléculas isovalentes de interés atmosférico CF3Cl y CF3Br y sus correspondientes halógenos aislados Cl y Br.  

NASA Astrophysics Data System (ADS)

Los estados Rydberg moleculares han suscitado en los últimos años un creciente interés entre los espectroscopistas experimentales, motivado en parte por el desarrollo de nuevas técnicas espectroscópicas capaces de investigar estos estados altamente excitados electrónicamente. Los procesos de fotoabsorción que implican estados Rydberg en los derivados halogenados del metano son de gran importancia, debido a su abundancia en la atmósfera y a sus implicaciones medioambientales. Por ello, la obtención de datos relativos a sus fuerzas de oscilador es de gran interés. En este trabajo se aborda el estudio de dichas propiedades para las moléculas isovalentes CF3Cl y CF3Br. Ambas moléculas presentan idéntica estructura electrónica para el estado fundamental por lo que se espera que sus espectros Rydberg presenten grandes similitudes, en ausencia de perturbaciones. Por ello y dada la escasez de datos relativos a fuerzas de oscilador, hemos establecido la corrección de nuestros resultados en base a las analogías esperadas en las intensidades espectrales correspondientes a transiciones análogas. Por otro lado, Novak y col. [1] han encontrado experimentalmente un marcado carácter atómico en el espectro correspondiente a estas moléculas, siendo muy similar a los de los átomos de Cl y Br. Por ello en el presente trabajo, además de establecer la comparación entre ambas moléculas hemos buscado las similitudes con sus respectivos halógenos. Los cálculos relativos a las especies moleculares se han realizado utilizando la Metodología Molécular de Orbítales de Defecto Cuántico (MQDO) [2], mientras que para el estudio de los átomos de Cl y Br se empleó la versión relativista del método (RQDO) [3].

Mayor, E.; Velasco, A. M.; Martín, I.; Lavín, C.

409

The Las Vegas Thesis  

ERIC Educational Resources Information Center

|Following "reflexive ethnography" and utilizing an approach of "performative narrative" and "layered text", this article explores how Bachelor of Arts students in the Teaching of English as a Foreign Language program at a public university in Mexico successfully manage the writing of an inductive-oriented thesis in English by resisting…

Sughrua, William

2010-01-01

410

The Las Vegas Thesis  

ERIC Educational Resources Information Center

Following "reflexive ethnography" and utilizing an approach of "performative narrative" and "layered text", this article explores how Bachelor of Arts students in the Teaching of English as a Foreign Language program at a public university in Mexico successfully manage the writing of an inductive-oriented thesis in English by resisting…

Sughrua, William

2010-01-01

411

VARIACIONES MICROCLIMÁTICAS EN INVERNADERO: EFECTO SOBRE LAS RELACIONES HÍDRICAS E INTERCAMBIO DE GASES EN PIMENTÓN (Capsicum annuum) GREENHOUSE MICROCLIMATIC VARIATIONS: EFFECTS ON WATER RELATIONS AND GAS EXCHANGE ON BELL PEPPER (Capsicum annuum)  

Microsoft Academic Search

? ? ? ? ?2 s ? ? ? ? ?1 ) sobre el microclima en invernaderos y las relaciones hídricas e intercambio de gases en tres híbridos de Capsicum annuum. Las mediciones de microclima incluyeron temperatura y humedad relativa a 4, 2.5 y 1.5 m. En ambas condiciones de radiación, la temperatura y humedad relativa entre 1.5 y 4.0

Ronald Da-Silva; Andreína D' Aubeterre; Josu Allende; Fermín Rada; Rafael Figueiral; Vivero El Horticultor

412

Mobilization of Ag, heavy metals and Eu from the waste deposit of the Las Herrerias mine (Almería, SE Spain)  

NASA Astrophysics Data System (ADS)

We studied the mobility of silver, heavy metals and europium in waste from the Las Herrerías mine in Almería (SE Spain). The most abundant primary mineral phases in the mine wastes are hematite, hydrohematite, barite, quartz, muscovite, anorthite, calcite and phillipsite. The minor phase consisted of primary minerals including ankerite, cinnabar, digenite, magnesite, stannite, siderite and jamesonite, and secondary minerals such as glauberite, szomolnokite, thenardite and uklonscovite. The soils show high concentrations of Ag (mean 21.6 mg kg-1), Ba (mean 2.5%), Fe (mean 114,000 mg kg-1), Sb (mean 342.5 mg kg-1), Pb (mean 1,229.8 mg kg-1), Zn (mean 493 mg kg-1), Mn (mean 4,321.1 mg kg-1), Cd (mean 1.2 mg kg-1) and Eu (mean 4.0 mg kg-1). The column experiments showed mobilization of Ag, Al, Ba, Cu, Cd, Eu, Fe, Mn, Ni, Sb, Pb and Zn, and the inverse modelling showed that the dissolution of hematite, hausmannite, pyrolusite and anglesite can largely account for the mobilization of Fe, Mn and Pb in the leaching experiment. The mobility of silver may be caused by the presence of kongsbergite and chlorargyrite in the waste, while the mobility of Eu seems to be determined by Eu(OH)3, which controls the solubility of Eu in the pH-Eh conditions of the experiments. The mineralogy, pH, Eh and geochemical composition of the mine wastes may explain the possible mobilization of heavy metals and metalloids. However, the absence of contaminants in the groundwater may be caused by the carbonate-rich environment of “host-rocks” that limits their mobility.

Navarro, A.; Cardellach, E.

2009-02-01

413

Sr Isotopes and Migration of Prairie Mammoths (Mammuthus columbi) from Laguna de las Cruces, San Luis Potosi, Mexico  

NASA Astrophysics Data System (ADS)

Asserting mobility of ancient humans is a major issue for anthropologists. For more than 25 years, Sr isotopes have been used as a resourceful tracer tool in this context. A comparison of the 87Sr/86Sr ratios found in tooth enamel and in bone is performed to determine if the human skeletal remains belonged to a local or a migrant. Sr in bone approximately reflects the isotopic composition of the geological region where the person lived before death; whereas the Sr isotopic system in tooth enamel is thought to remain as a closed system and thus conserves the isotope ratio acquired during childhood. Sr isotope ratios are obtained through the geologic substrate and its overlying soil, from where an individual got hold of food and water; these ratios are in turn incorporated into the dentition and skeleton during tissue formation. In previous studies from Teotihuacan, Mexico we have shown that a three-step leaching procedure on tooth enamel samples is important to assure that only the biogenic Sr isotope contribution is analyzed. The same Sr isotopic tools can function concerning ancient animal migration patterns. To determine or to discard the mobility of prairie mammoths (Mammuthus columbi) found at Laguna de las Cruces, San Luis Potosi, México the leaching procedure was applied on six molar samples from several fossil remains. The initial hypothesis was to use 87Sr/86Sr values to verify if the mammoth population was a mixture of individuals from various herds and further by comparing their Sr isotopic composition with that of plants and soils, to confirm their geographic origin. The dissimilar Sr results point to two distinct mammoth groups. The mammoth population from Laguna de Cruces was then not a family unit because it was composed by individuals originated from different localities. Only one individual was identified as local. Others could have walked as much as 100 km to find food and water sources.

Solis-Pichardo, G.; Perez-Crespo, V.; Schaaf, P. E.; Arroyo-Cabrales, J.

2011-12-01

414

Bioaccumulation and toxicity of 4-nonylphenol (4-NP) and 4-(2-dodecyl)-benzene sulfonate (LAS) in Lumbriculus variegatus (Oligochaeta) and Chironomus riparius (Insecta).  

PubMed

The discharge of surfactants, such as 4-nonylphenol (4-NP) and linear alkylbenzene sulfonates (LAS), into water bodies leads to accumulation of the chemicals in the sediments and may thus pose a problem to benthic organisms. To study the bioaccumulation of surfactants, Oligochaeta worm Lumbriculus variegatus was exposed to sediment-spiked, [14C]-labeled 4-NP and 4-(2-dodecyl)-benzene sulfonate (C12-LAS) in three different sediments (S1-S3). The sediments were characterized for organic carbon (OC) content and particle size distribution. The acute toxicity was examined by exposing L. variegatus and three to four instar Chironomus riparius (Insecta) larvae in water-only exposure to 4-NP and LAS at different concentrations. After 48-h exposure, lethal water concentrations (LC50) and lethal body residues (LBR50) were estimated using liquid scintillation counting. Chronic toxicity was evaluated in two different sediments by exposing first instar C. riparius larvae to sediment-spiked chemicals at different concentrations. After 10 days, the sublethal effects of surfactants were observed by measuring wet weight and head capsule length. Finally, another 10-day test was set up in order to measure the LAS body residues associated with sublethal effects in C. riparius in S2 sediment. The bioaccumulation test revealed that the bioaccumulation of both 4-NP and LAS increased as the sediment organic matter content decreased. It is assumed that the chemical binding to organic material decreased chemical bioavailability. The acute toxicity tests showed that L. variegatus was more tolerant of 4-NP, and C. riparius was more tolerant of LAS when based on water exposure concentration. The LBR-estimates revealed, however, that L. variegatus tolerated clearly higher tissue residues of both chemicals compared with C. riparius. Both chemicals had sublethal effects on C. riparius growth in sediment exposure, reducing larvae wet weight and head capsule size. 4-NP, however, showed an irregular dose-response pattern. The characteristics of the exposure media affected the bioaccumulation potential of both chemicals. Thus, exposure concentrations offered no prediction of body residue, and therefore it is proposed that organism body residue offered a more accurate dose-metric for chemical exposure than the chemical concentration of the environment. PMID:16458370

Mäenpää, K; Kukkonen, J V K

2006-02-02

415

Application of Similar Media Scaling and Conditional Simulation for Modeling Water Flow and Tritium Transport at the Las Cruces Trench Site  

NASA Astrophysics Data System (ADS)

Similar media scaling and geostatistical analyses are used to characterize the spatial variability of soil hydraulic properties at the Las Cruces Trench Site in New Mexico. A simple method is described for conditioning the hydraulic properties used for unsaturated water flow and solute transport modeling, based on the spatial distributions of initial field-measured water contents and a set of scale-mean hydraulic parameters determined from the scaling analysis. This method is used to estimate hydraulic properties for numerical simulations of the latest field-scale flow and transport experiment conducted at the Las Cruces Trench Site. Relatively good matches between the observed and simulated flow and transport behavior are obtained without model calibration. The results of this study suggest that using similar media scaling in conjunction with the described conditioning procedure can significantly reduce the uncertainty in predictions of water flow and solute transport in spatially variable soils.

Rockhold, Mark L.; Rossi, Richard E.; Hills, Richard G.

1996-03-01

416

Geologic and geophysical maps of the Las Vegas 30' x 60' quadrangle, Clark and Nye counties, Nevada, and Inyo County, California  

USGS Publications Warehouse

Las Vegas and Pahrump are two of the fastest growing cities in the US, and the shortage of water looms as among the greatest future problems for these cities. These new maps of the Las Vegas 30 x 60-minute quadrangle provide a geologic and geophysical framework and fundamental earth science database needed to address societal issues such as ground water supply and contamination, surface flood, landslide, and seismic hazards, and soil properties and their changing impact by and on urbanization. The mountain ranges surrounding Las Vegas and Pahrump consist of Mesozoic, Paleozoic and Proterozoic rocks. A majority of these rocks are Paleozoic carbonate rocks that are part of Nevada's carbonate rock aquifer province. The Spring Mountains represent a major recharge site in the province, where maximum altitude is 3,632 m (Charleston Peak) above sea level. Rocks in the Sheep and Las Vegas Ranges and Spring Mountains contain correlative, northeast-striking, southeast-verging thrust faults that are part of the Cretaceous, Sevier orogenic belt. These thrusts were offset during the Miocene by the Las Vegas Valley shear system (LVVSZ). We conducted new mapping in the Blue Diamond area, highlighting refined work on the Bird Spring thrust, newly studied ancient landslides, and gravity-slide blocks. We conducted new mapping in the Las Vegas Range and mapped previously unrecognized structures such as the Valley thrust and fold belt; recognition of these structures has led to a refined correlation of Mesozoic thrust faults across the LVVSZ. New contributions in the quadrangle also include a greatly refined stratigraphy of Paleozoic bedrock units based on conodont biostragraphy. We collected over 200 conodont samples in the quadrangle and established stratigraphic reference sections used to correlate units across the major Mesozoic thrust faults. Quaternary deposits cover about half of the map area and underlie most of the present urbanized area. Deposits consist of large coalescing alluvial fans that grade downslope to extensive areas of fine-grained sediment indicative of groundwater-discharge during the Pleistocene. In the central areas of Las Vegas and Pahrump valleys, Quaternary fault scarps associated with past ground-water discharge deposits suggest a genetic relationship. In collaboration with NBMG and University of Nevada, a variety of ages of gravelly alluvium are newly mapped using surficial characteristics and soil development, along with reassessment of previously published mapping during compilation. Reconnaissance geochronology (thermoluminescence and U-series) of eolian and authigenic components of surficial and buried soils and spring deposits is applied to test hypotheses of geomorphic and hydrologic response to climate change over the past 100 k.y.). The major structure in the Las Vegas quadrangle is the LVVSZ. Because the LVVSZ is concealed by thick basin-fill deposits of Quaternary and Tertiary age, it was characterized primarily based on geophysics. Likewise, the newly described State line fault system in Pahrump Valley has also been characterized by geophysics, where geophysically inferred structures correlate remarkably with surface structures defined by our new geologic mapping in the Mound Spring and Hidden Hills Ranch 7.5-minute quadrangles.

Page, William R.; Lundstrom, Scott, C.; Harris, Anita G.; Langenheim, Victoria E.; Workman, Jeremiah B.; Mahan, Shannon A.; Paces, James B.; Dixon, Gary L.; Rowley, Peter D.; Burchfiel, B. C.; Bell, John W.; Smith, Eugene I.

2005-01-01

417

Toxicity of a novel herbomineral preparation las01 on human cancer cell lines and its safety profile in humans and animals.  

PubMed

Polyhedral formulations based on Rasayana therapy described in Charaka Samhita showed remarkable improvement in quality of life of various cancer patients who have been found to be refractory or poor responders to modern chemotherapy and radiation treatment. One of the most recent novel herbomineral preparation, Las01 prepared absolutely as per the instruction given in the ancient Ayurvedic literature has been found to be effective as a potent anticancer drug in the human cell lines, the MCF-7 and Hela cancer cell lines. This novel preparation of Las01 is also found to be devoid of toxicity both in animals as well as in human subjects, which is the main drawback of chemotherapeutic agents used in modern system of medicine. Our results warrant multicentric clinical trials on a large scale which seems to be a future promising drug to cure incurables cancer patients. PMID:22969832

Sheikh, Saba; Srivastava, Ashok; Tripathi, Rajesh; Tripathi, Shalini; Trivedi, V P; Saxena, R C

2012-08-30

418

Nuevo estudio relaciona a los índices de utilización de servicios de atención médica más que a la biología con las desigualdades en salud por cáncer colorrectal  

Cancer.gov

Los índices más altos de incidencia y mortalidad por cáncer colorrectal que experimentan los afroamericanos pueden deberse principalmente a las diferencias en la utilización de servicios médicos y en menor proporción a la biología, según un nuevo estudio dirigido por investigadores del NCI. Índices más bajos de seguimiento podrían resultar en un retraso del diagnóstico y de tratamiento y en un aumento de la mortalidad.

419

Gaseous Mercury Monitoring at a Complex Source: The Las Cuevas Decommissioned Mining Complex and Current Hg Storage Facility (Almadén District, Spain)  

NASA Astrophysics Data System (ADS)

The Las Cuevas decommissioned mining complex was the third in importance in the world’s largest mercury mining district: Almadén (south-central Spain). Mining took place during two well differentiated periods: 1. Roman time; and 2. From 1982 to 2000. In 2004 the mine was transformed into a mercury storage and handling facility, away from urban areas. Furthermore, the area served as a test site for the design and implementation of a mercury safe storage vessel, a study funded by European LIFE-Env programme (Project MERSADE, LIFE06 ENV/ES/PREP/03) (Llanos et al., 2010). On this basis, Las Cuevas site can be regarded as a complex source of atmospheric mercury for the local environmental compartments, including emissions from the plant activity, partly reclamated old mineral dumps, contaminated soils, and other minor sources, such as cavities produced by mine collapse. We studied the emissions with two LUMEX RA-915+ Hg analyzers, one LUMEX RA-915Light device and a complete TEKRAN equipment, including Mercury Speciation Unit (model 1130) and Particulate Mercury Unit (Model 1135). Data has been treated with ISC-AERMOD program, in order to obtain models for contamination plumes derived from Las Cuevas whole area. The results confirm the mercury storage facility as the main local source for mercury, releasing some 3,15 kg Hg y-1, whereas contaminated soils and reclamated dumps represent local minor sources. Over 99,9% of local atmospheric mercury is Gaseous Elemental Mercury, with Reactive Gaseous Mercury representing 0,25 per mil, and particulate bound mercury, 1,8 per mil. Citation: Llanos, W.; Higueras, P.; Oyarzun, R.; Esbrí, J.M.; López-Berdonces, M.A.; García-Noguero, E.M.; Martínez-Coronado, A. (2010) A preliminary environmental assessment at the site of the European prototype installation of a safe deposit for surplus mercury from industry: The Las Cuevas mining complex, Almadén District, Spain. Science of the Total Environment, 408: 4901-4905.

Higueras, P. L.; Esbri, J. M.; Llanos, W. R.; Oyarzun, R.; Martinez-Coronado, A.; Grupo de Estudios En Minería Y Medioambiente-Gemm

2010-12-01

420

Removal of metal ions at low concentration by micellar-enhanced ultrafiltration (MEUF) using sodium dodecyl sulfate (SDS) and linear alkylbenzene sulfonate (LAS)  

Microsoft Academic Search

Micellar-enhanced ultrafiltration (MEUF) has been used to remove dissolved metals including Cd2+, Cu2+, Ni2+, Pb2+, and Zn2+ from synthetic water using two anionic surfactants: sodium dodecyl sulfate (SDS), and linear alkylbenzene sulfonate (LAS) in a lab-scale membrane system. The effect of surfactant concentration, pH and conductivity on metal retention was studied. The molar concentration ratio of the surfactant to metal

E. Samper; M. Rodríguez; M. A. De la Rubia; D. Prats

2009-01-01

421

Influence of linear alkylbenzene sulfonate (LAS) as organic cosolvent on leaching behaviour of PCDD\\/Fs from fly ash and soil  

Microsoft Academic Search

The leaching of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD\\/Fs) was measured in soil and standard fly ash column eluted with pure water and linear alkylbenzene sulfonate (LAS) - water. The data obtained were used to evaluate the leachability of PCDD\\/Fs from waste dump like incineration residual slag and fly ash deposition. The leaching rate was shown to be increased significantly by

K.-W Schramm; W. Z. Wu; B. Henkelmann; M. Merk; Y. Xu; Y. Y. Zhang; A. Kettrup

1995-01-01

422

A McOndo Writer's Take on Literature in the Era of Audiovisual and Digital Communication: The Case of Alberto Fuguet's Las películas de mi vida  

Microsoft Academic Search

: Alberto Fuguet, one of the leaders of the McOndo writers who seek cultural direction from the United States and exploit mass-media formulas, is a polarizing figure in contemporary Latin American culture. His most recent full-length novel, the semi-autobiographical Las películas de mi vida (2003), has led many to conclude that Fuguet is simply a pawn of North American cultural

Linda S. Maier

2011-01-01

423

A McOndo Writer's Take on Literature in the Era of Audiovisual and Digital Communication: The Case of Alberto Fuguet's Las películas de mi vida  

Microsoft Academic Search

Alberto Fuguet, one of the leaders of the McOndo writers who seek cultural direction from the United States and exploit mass-media formulas, is a polarizing figure in contemporary Latin American culture. His most recent full-length novel, the semi-autobiographical Las películas de mi vida (2003), has led many to conclude that Fuguet is simply a pawn of North American cultural hegemony

Linda S. Maier

2011-01-01

424

An Examination of Elemental Stability in the Fin Ray of the White Sturgeon with Laser Ablation Sampling–Inductively Coupled Plasma–Mass Spectrometry (LAS-ICP-MS)  

Microsoft Academic Search

Laser ablation sampling–inductively coupled plasma–mass spectrometry (LAS-ICP-MS) was used to examine the elemental composition of the opaque growth zones in the leading ray from the pectoral fin of 10 white sturgeon Acipenser transmontanus recaptured from the Columbia River. Changes in the elemental composition were detected within 2 years after their initial capture, with significant correlations among the concentrations of Sr,

Geoffrey I. Veinott; R. Douglas Evans

1999-01-01

425

Eruption and magma crystallization ages of Las Tres Vírgenes (Baja California) constrained by combined 230Th\\/ 238U and (U–Th)\\/He dating of zircon  

Microsoft Academic Search

Las Tres Vírgenes volcano is a calc-alkaline composite cone located near the main Gulf of California escarpment on the E coast of the Baja California peninsula. High-sensitivity ion microprobe U-series (230Th\\/238U) ages for zircon from La Vírgen tephra average 121?10+12 ka (1?; MSWD=2.7), with discrete age peaks at ?100 and 160 ka. The noble gas mass spectrometric (U–Th)\\/He zircon age, corrected for

Axel K. Schmitt; Daniel F. Stockli; Brian P. Hausback

2006-01-01

426

Creating an Evidence-Based Admissions Formula for a New Dental School: University of Nevada, Las Vegas, School of Dental Medicine  

Microsoft Academic Search

This article reports development of an evidence-based admissions formula that effectively incorporates the admissions criteria most likely to influence dental school performance. This study utilized peer-reviewed literature and analysis of admissions and performance data from the first three classes of students at the University of Nevada, Las Vegas, School of Dental Medicine (UNLV-SDM). We used Pearson's correlation, linear regression, and

Karl Kingsley; Jeremy Sewell; Marcia Ditmyer; Susan O'Malley; Gillian M. Galbraith

427

New 40Ar/39Ar isotopic dates from Miocene volcanic rocks in the Lake Mead area and southern Las Vegas Range, Nevada  

USGS Publications Warehouse

New 40Ar/39Ar dates on volcanic rocks interlayered with synextensional Miocene sedimentary rocks in the western Lake Mead area and southern end of the Las Vegas Range provide tight constraints on magmatism, basin formation, and extensional deformation in the Basin and Range province of southern Nevada. Vertical axis rotations associated with movement along the Las Vegas Valley shear zone occurred after 15.67??0.10 Ma (2??), based on a 40Ar/39Ar date from a tuff in the Gass Peak formation in the southern Las Vegas Range. Basaltic magmatism in the western Lake Mead area began as early as 13.28??0.09 Ma, based on a date from a basalt flow in the Lovell Wash Member of the Horse Spring Formation. Isotopic dating of a basalt from the volcanic rocks of Callville Mesa indicates that these rocks are as old as 11.41??0.14 Ma, suggesting that volcanic activity began shortly after formation of the Boulder basin, the extensional basin in which the informally named red sandstone unit was deposited. The red sandstone unit is at least as old as 11.70??0.08 Ma and contains megabreccia deposits younger than 12.93??0.10 Ma. This results shows that formation of the Boulder basin was associated with development of topographic relief that was probably generated by movement along the Saddle Island low-angle normal fault. Stratal tilting associated with extension occurred both prior to and after 11.5 Ma.

Harlan, S. S.; Duebendorfer, E. M.; Deibert, J. E.

1998-01-01

428

Receptor modeling of near-roadway aerosol mass spectrometer data in Las Vegas, Nevada, with EPA PMF  

NASA Astrophysics Data System (ADS)

Ambient non-refractory PM1 aerosol particles were measured with an Aerodyne High Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-AMS) at an elementary school 20 m from the US 95 freeway in Las Vegas, Nevada, during January 2008. Additional collocated continuous measurements of black carbon (BC), carbon monoxide (CO), nitrogen oxides (NOx), and meteorological data were collected. The US Environmental Protection Agency's (EPA) positive matrix factorization (PMF) data analysis tool was used to apportion organic matter (OM) as measured by HR-AMS, and rotational tools in EPA PMF were used to better characterize the solution space and pull resolved factors toward known source profiles. Three- to six-factor solutions were resolved. The four-factor solution was the most interpretable, with the typical AMS PMF factors of hydrocarbon-like organic aerosol (HOA), low-volatility oxygenated organic aerosol (LV-OOA), biomass burning organic aerosol (BBOA), and semi-volatile oxygenated organic aerosol (SV-OOA). When the measurement site was downwind of the freeway, HOA composed about half the OM, with SV-OOA and LV-OOA accounting for the rest. Attempts to pull the PMF factor profiles toward source profiles were successful but did not qualitatively change the results, indicating that these factors are very stable. Oblique edges were present in G-space plots, suggesting that the obtained rotation may not be the most plausible one. Since solutions found by pulling the profiles or using Fpeak retained these oblique edges, there appears to be little rotational freedom in the base solution. On average, HOA made up 26 % of the OM, and it made up nearly half of the OM when the monitoring site was downwind of US 95 during morning rush hour. LV-OOA was highest in the afternoon and accounted for 26 % of the OM. BBOA occurred in the evening hours, was predominantly from the residential area to the north, and on average constituted 12 % of the OM; SV-OOA accounted for the remaining third of the OM. Use of the pulling techniques available in EPA PMF and ME-2 suggested that the four-factor solution was very stable.

Brown, S. G.; Lee, T.; Norris, G. A.; Roberts, P. T.; Collett, J. L., Jr.; Paatero, P.; Worsnop, D. R.

2011-08-01

429

Degradación de Marismas Costera: el Impacto de la Eutrofización en la Supervivencia del las Marismas Costeras en New England y Central California, USA. (Salt Marsh Deterioration in New England and Central California: Impacts of Eutrophication on Salt Marsh Survival.)  

EPA Science Inventory

Las marismas costeras proporcionan numerosos beneficios a los ecosistemas, incluyendo la proporción del hábitat de la flora y fauna, la protección de las zonas costeras contra inundaciones durante eventos extremos, mejoran la calidad del agua para las almejas y ostras a través de...

430

EL CAPITAL RELACIONAL DE LAS COOPERATIVAS DE CRÉDITO EN ESPAÑA: UN ESTUDIO CUALITATIVO DE SUS INTANGIBLES SOCIALES MEDIANTE EL ANÁLISIS DELPHI \\/ THE RELATIONAL CAPITAL OF THE CREDIT COOPERATIVES IN SPAIN: A QUALITATIVE STUDY OF THEIR SOCIAL INTANGIBLE USING THE DELPHI ANALYSIS  

Microsoft Academic Search

Especialmente en el caso de las cajas de ahorro, el capital social ha sido recurrentemente utilizado para explicar la aportación que ciertas entidades bancarias realizan al desarrollo económico y social de sus territorios de actuación. Las cooperativas de crédito, como organizaciones singulares en nuestro sistema financiero, poseen unos intangibles de características particulares. Así, la reputación corporativa, las relaciones sociales, con

Elies SEGUÍ-MAS; Ricardo J SERVER IZQUIERDO

431

Las Alpujarras region (South East Spain) HLA genes study: evidence of a probable success of 17th century repopulation from North Spain.  

PubMed

Conquest of Granada Muslim Kingdom (1492 AD) finished with Muslim occupation; they were mostly North African Berbers who had reached Iberia by 711 AD. A politics of Iberian Christianization followed after this date: Jewish were expelled in 1492 and Moriscos (Spaniards practicing Muslim religion or speaking Arab) were expelled from all Spanish territory on 1609 AD. Las Alpujarras is a southern Spain mountainous secluded region, which underwent a repopulation from North Spain and a specific Muslim (Moriscos)-Christian war took place according to historical records. Both Las Alpujarras repopulation by northern Iberians and Moriscos expulsion success have been debated and are regarded as non-clarified episodes. In this study, we have addressed the question whether the repopulation succeeded by determining HLA genes of present day Las Alpujarras inhabitants and compared with those of other Mediterranean populations HLA frequencies and genealogies. HLA frequencies show ambiguous results because of extant HLA similar gene frequencies there exist in North Africa and Spain. This is reflected by the finding of North and South western Mediterraneans close relatedness of HLA dendrograms and correspondence analyses. However, the genealogical study of extended HLA haplotypes particularly Alpujarran high frequency of HLA-A29-B44-DRB1*0701-DQA1*02-DQB1*02 (not found in Algerians but frequent in North and Central Spain) and Alpujarran low frequency extended haplotype HLA-A3-B7-DRB1*1501-DQA1*0102-DQB1*0602 (frequent in North Europe) reveals that a significant HLA gene flow from North Spain is observed in present day Alpujarrans: both haplotypes are characteristic of North Spain and North Europe, respectively. This may indicate that enforced Alpujarran repopulation from North Spain may have been a success, which was started by Spanish King Philip II in 1571 AD. PMID:21633894

Longás, Javier; Martínez-Laso, Jorge; Rey, Diego; Areces, Cristina; Casado, Eduardo Gómez; Parga-Lozano, Carlos; Luna, Francisco; de Salamanca, Mercedes Enriquez; Moral, Pedro; Arnaiz-Villena, Antonio

2011-06-03

432

A Three-dimensional Modeling Approach of the Role of Faulting in Land Surface Deformation: The Case of the Eglington Fault in Las Vegas Valley  

NASA Astrophysics Data System (ADS)

Overpumping in Las Vegas Valley has caused an increase in effective stress and the accumulation of strain in critical zones. As a consequence of this stress-strain configuration, surface deformation expressed in the form of earth fissures and land subsidence has been occurring most commonly in zones adjacent to quaternary faults. The Eglington Fault, located in the north-west portion of Las Vegas Valley, has had a profound affect on surface deformation patterns by restraining the migration of land subsidence and creating complex hydromechanical failure mechanisms. Fissures typically result from horizontal displacements that occur in zones where extensional stress derived from groundwater flow exceeds the tensile strength of the near-surface sediments. A series of hypothetical numerical models using the finite-element code ABAQUS, and based on the observed conditions of the Eglington Fault zone, were developed to gain a better understanding of the mechanisms responsible for the observed land subsidence and fissuring patterns. Model simulations were developed using three time steps to reproduce the (1) long-term period of natural recharge and discharge, (2) heavy pumping and (3) artificial recharge that reflect the conditions of Las Vegas Valley over the past 75 years. The simulated hydrostratigraphy consists of three aquifers, two aquitards and a relatively dry vadoze zone. In addition, a normal fault zone that reflects the Quaternary Eglington fault was included in the models. The fault zone was simulated using four different widths and two different types of materials with contrasting hydromechanical properties. Numerical results suggest that a 100 m wide fault zone composed of sand-like material represents: (1) conditions most similar to those observed in Eglington Fault zone and (2) the most favorable conditions for the development of fissures forming on the surface adjacent to the fault zone.

Hernandez-Marin, M.; Burbey, T. J.

2008-12-01

433

Effect of linear alkylbenzene sulphonate (LAS) on the mineralization, metabolism and uptake of 14C-phenanthrene in a model ecosystem (water-lava-plant-air).  

PubMed

The aim of this work was to evaluate the effect of linear alkylbenzene sulfonate (LAS, 200 mg l(-1)) on the fate of phenanthrene in a model ecosystem "water-lava-hydrophytes-air". The experiments were conducted using two closed cultivation chamber systems. Rushes (Juncus effesus) were selected as a representative hydrophyte. Five hundred micrograms per liter of phenanthrene in a culture solution containing a 14C-activity of 75 microCi per chamber was applied (i) to investigate the degradation of the labeled test substance and the transfer processes within the system; (ii) to determine the mass-balance possible and (iii) to detect the occurrence of volatile test substances, their volatile metabolites and the degradation end-product CO2 in the gas phase. Most of the applied 14C-activity was found in the plant (41-45%), in which approximately 95% was associated with plant roots and approximately 5% with shoots. The 14C-activity recovered in the form of VOCs and CO2 was measured in lava (18-29%, 8-11%), and in the culture solution (10-14% and 1%), respectively. Majority of the applied 14C-activity existed in two forms, i.e. (1) polar metabolites (26%), of which 91% were found in plant roots, and (2) un-extractable residues (23%), most of which were in plant roots (40%) and bounded to lava (58%). The presence of LAS significantly increased the volatilization of phenanthrene and its metabolites, inhibited its mineralization and decreased the level of 14C-activity in lava. Moreover, LAS reduced the phenanthrene level in plant roots. PMID:16019053

Jiang, Xia; Yediler, Ayfer; Yufang, Song; Sun, Tieheng; Kettrup, Antonius

2005-07-12

434

210Pb-derived history of PAH and PCB accumulation in sediments of a tropical inner lagoon (Las Matas, Gulf of Mexico) near a major oil refinery  

NASA Astrophysics Data System (ADS)

Concentrations of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) were measured in a sediment core from the tropical freshwater inner lagoon of Las Matas, near the petroleum industrial area of Minatitlán-Coatzacoalcos, in the Gulf of Mexico. A 210Pb-derived chronology was used to reconstruct the historical PAH and PCB accumulation in the site during one century (1906-2005). Both geochemical and sedimentological data indicated that a major change occurred in 1947 ± 4, including a shift to coarser sediments and a significant decrease of Al, Li, Fe, organic C and total N contents. This was likely due to the changes in hydrology caused by the confinement of Las Matas Lagoon due to the construction of the Trans-Isthmus road in 1946. PAHs in these samples show relatively low concentrations (259-1176 ng g-1), and the congener relative abundances indicate the influence of pyrogenic (petroleum combustion) sources. Total PCB concentrations in the sediments ranged from 24 to 77 ng g-1, and are composed by low chlorinated PCBs, with 3- and 4-CB as the prevalent species (51-65% and 29-40%, respectively). PAHs and PCBs were detected at depths corresponding to the early 1900s, when Minatitlán refinery started operations, although their time evolution appears to be influenced by different accumulation processes. The PCB background is most likely produced by the combustion of natural organic matter, and an industrial contribution can be recognized when normalizing with OC contents. We concluded that atmospheric deposition is the most significant source of PAHs and PCBs for this water body. This study also provided evidence of the alteration of the wetlands surrounding this industrial area due to urbanization; the fragmentation and alteration of Las Matas Lagoon hydrology contributes to the gradual loss of the wetlands in the zone.

Ruiz-Fernández, Ana Carolina; Sprovieri, Mario; Piazza, Rossano; Frignani, Mauro; Sanchez-Cabeza, Joan-Albert; Feo, Maria Luisa; Bellucci, Luca Giorgio; Vecchiato, Marco; Pérez-Bernal, Libia Hascibe; Páez-Osuna, Federico

2012-04-01

435

Chivo expiatorio, nación y comedia en Las paces de los reyes y judía de Toledo de Lope de Vega  

Microsoft Academic Search

El ensayo examina la utilidad del concepto de chivo expiatorio acuñado por el filósofo y crítico literario René Girard para analizar el proceso de construcción de la identidad nacional y su relación con la teoría dramática de la comedia en La judía de Toledo \\/ Las paces de los Reyes (1610) de Lope de Vega. Tal concepto aparece estrechamente vinculado

Javier Lorenzo

2009-01-01

436

Estudio de Asignación de Opciones Individualizadas de Tratamiento (TAILORx): preguntas y respuestas  

Cancer.gov

Hoy se inició el Estudio de Asignación de Opciones Individualizadas de Tratamiento (Trial Assigning IndividuaLized Options for Treatment (Rx), o TAILORx, el cual evaluará si los genes que están frecuentemente asociados con el riesgo de recurrencia entre las mujeres con cáncer de seno en etapa inicial pueden ser utilizados para asignar a las pacientes el tratamiento más adecuado y efectivo.

437

El ojo de Circe. Poemas escogidos 1995-2005  

Microsoft Academic Search

Un libro por centavos n.º 24 “Desde la otra orilla, sueño y locura, o desde las márgenes de un orbe regenteado por quienes pensaron que la mujer es la clase obrera del hombre, como afirmara con sorna Carlos Marx, hasta las acusadas de relapsas mientras eran conducidas a la pira en la larga noche de la Inquisición, como Prisca, Doris,

Lucía Estrada

438

Immunosuppressive but non-LasR-inducing analogues of the Pseudomonas aeruginosa quorum-sensing molecule N-(3-oxododecanoyl)-l-homoserine lactone.  

PubMed

The Pseudomonas aeruginosa quorum-sensing molecule N-(3-oxododecanoyl)-l-homoserine lactone (1) is involved not only in bacterial activation but also in subversion of the host immune system, and this compound might thus be used as a template to design immunosuppressive agents, provided derivatives devoid of quorum-sensing activity could be discovered. By use of a leukocyte proliferation assay and a newly developed bioluminescent P. aeruginosa reporter assay, systematic modification of 1 allowed us to delineate the bacterial LasR-induction and host immunosuppressive activities. The main determinant is replacement of the methylene group proximal to the ?-ketoamide in the acyl chain of 1 with functions containing heteroatoms, especially an NH group. This modification can be combined with replacement of the homoserine lactone system in 1 with stable cyclic groups. For example, we found the simple compound N(1)-(5-chloro-2-hydroxyphenyl)-N(3)-octylmalonamide (25d) to be over twice as potent as 1 as an immune suppressor while displaying LasR-induction antagonist activity. PMID:21488685

Jadhav, Gopal P; Chhabra, Siri Ram; Telford, Gary; Hooi, Doreen S W; Righetti, Karima; Williams, Paul; Kellam, Barrie; Pritchard, David I; Fischer, Peter M

2011-04-13

439

MAS-NMR studies of lithium aluminum silicate (LAS) glasses and glass-ceramics having different Li2O/Al2O3 ratio  

NASA Astrophysics Data System (ADS)

Emergence of phases in lithium aluminum silicate (LAS) glasses of composition (wt%) xLi2O-71.7SiO2-(17.7-x)Al2O3-4.9K2O-3.2B2O3-2.5P2O5 (5.1?x?12.6) upon heat treatment were studied. 29Si, 27Al, 31P and 11B MAS-NMR were employed for structural characterization of both LAS glasses and glass-ceramics. In glass samples, Al is found in tetrahedral coordination, while P exists mainly in the form of orthophosphate units. B exists as BO3 and BO4 units. 27Al NMR spectra show no change with crystallization, ruling out the presence of any Al containing phase. Contrary to X-ray diffraction studies carried out, 11B (high field 18.8 T) and 29Si NMR spectra clearly indicate the unexpected crystallization of a borosilicate phase (Li,K)BSi2O6, whose structure is similar to the aluminosilicate virgilite. Also, lithium disilicate (Li2Si2O5), lithium metasilicate (Li2SiO3) and quartz (SiO2) were identified in the 29Si NMR spectra of the glass-ceramics. 31P NMR spectra of the glass-ceramics revealed the presence of Li3PO4 and a mixed phase (Li,K)3PO4 at low alkali concentrations.

Ananthanarayanan, A.; Kothiyal, G. P.; Montagne, L.; Revel, B.

2010-01-01

440

Molecular Basis for the Recognition of Structurally Distinct Autoinducer Mimics by the Pseudomonas aeruginosa LasR Quorum Sensing Signaling Receptor  

PubMed Central

The human pathogen Pseudomonas aeruginosa coordinates the expression of virulence factors using quorum sensing, a signaling cascade triggered by the activation of signal receptors by small molecule autoinducers. These homoserine lactone autoinducers stabilize their cognate receptors and activate their functions as transcription factors. As quorum sensing regulates the progression of infection and host immune resistance, significant efforts have been devoted towards the identification of small molecules that disrupt this process. Screening efforts have identified a class of triphenyl compounds that are structurally distinct from the homoserine lactone autoinducer, yet interact specifically and potently with LasR receptor to modulate quorum sensing (Muh et al., 2006a). Here we present the high-resolution crystal structures of the ligand-binding domain of LasR in complex with the autoinducer N-3-oxo-dodecanoyl homoserine lactone (1.4 Å resolution), and with the triphenyl mimics TP-1, TP-3, and TP-4 (to between 1.8-2.3 Å resolution). These crystal structures provide a molecular rationale for understanding how chemically distinct compounds can be accommodated by a highly selective receptor and provides the framework for the development of novel quorum sensing regulators, utilizing the triphenyl scaffold.

Zou, Yaozhong; Nair, Satish K.

2009-01-01

441

Anisotropy of Magnetic Susceptibility (AMS) of the Neogene Volcanic Succession at the Sierra Juarez - Las PintasVolcanic Province, Northeastern Baja California, Mexico: Preliminary Results  

NASA Astrophysics Data System (ADS)

The Sierra Juarez-Las Pintas Volcanic Province is among the largest in northern Baja California. For this work, we focused on a bimodal volcanic succession of late Miocene age, composed of an extensive ignimbrite unit and few dispersed basaltic flows that crop out in central Sierra Juarez and northern Sierra Las Tinajas. The ignimbrite is zoned, composed by three distinctive members: a basal unwelded white tuff, a mid-section unwelded orange tuff, and an upper red welded tuff. The basaltic flows are olivine-rich. Samples were collected in five sites that define a NE-SW section across the Sierra Juarez Escarpment, in the western boundary of the so-called Gulf Extensional Province. In each of these sites a stratigraphic column composed of more than one geologic unit was sampled. The total number of analyzed cores is ca. 160. The preliminary results show vertical and lateral variations of the AMS of the ignimbrite that can be interpreted in terms of the local flow direction and processes of emplacement of these volcanic deposits. Such variations, in turn, are likely to reflect variations in the dynamics of the eruptive process that produced them. Although the AMS of all the rocks in this province display a complex set of orientations, in this work is shown that when examined in detail important clues concerning the geological evolution of the province can be obtained from these data.

Mendoza-Borunda, R.; Cañón-Tapia, E.; Suárez-Vidal, F.; Gradilla-Martínez, L.

2010-12-01

442

Geology of La Gloria and Las Cumbres Volcanic Fields. Two highly eroded avalanche caldera complexes at the eastern sector of the Trans-Mexican Volcanic Belt.  

NASA Astrophysics Data System (ADS)

La Gloria and Las Cumbres Volcanic Fields form part of a nearly NE-SW aligned volcanic range formed by the Cofre de Perote extinct volcano in the north and the active Citlaltépetl volcano to the south. This mainly andesitic volcanic range is one of the most striking morphological features in the eastern Trans-Mexican Volcanic Belt (TMVB). Practically all the stratovolcanoes that form this volcanic range has experienced partial collapse of their east flanks, which reflects the influence of the pre-volcanic structure of the basement. One of the main aspects in the geology of this area is to determine the distribution of the avalanche deposits derived from Las Cumbres and La Gloria volcanoes. The former has a well defined crater and the second one just remaining of the old edifice. We present the geologic map showing the field data with the stratigraphic relations, geochemical analyses and isotopic dating from La Gloria in order to compare the lavas that are still forming the eroded edifices with the avalanche deposits. This information will help to establish a model of the volcanic evolution of the eastern sector of the TMVB.

Rodriguez, S. R.; Layer, P.; Capra, L.

2006-12-01

443

Molecular Basis for the Recognition of Structurally Distinct Autoinducer Mimics by the Pseudomonas aeruginosa LasR Quorum-Sensing Signaling Receptor  

SciTech Connect

The human pathogen Pseudomonas aeruginosa coordinates the expression of virulence factors using quorum sensing, a signaling cascade triggered by the activation of signal receptors by small-molecule autoinducers. These homoserine lactone autoinducers stabilize their cognate receptors and activate their functions as transcription factors. Because quorum sensing regulates the progression of infection and host immune resistance, significant efforts have been devoted toward the identification of small molecules that disrupt this process. Screening efforts have identified a class of triphenyl compounds that are structurally distinct from the homoserine lactone autoinducer, yet interact specifically and potently with LasR receptor to modulate quorum sensing (Muh et al., 2006a). Here we present the high-resolution crystal structures of the ligand binding domain of LasR in complex with the autoinducer N-3-oxo-dodecanoyl homoserine lactone (1.4 {angstrom} resolution), and with the triphenyl mimics TP-1, TP-3, and TP-4 (to between 1.8 {angstrom} and 2.3 {angstrom} resolution). These crystal structures provide a molecular rationale for understanding how chemically distinct compounds can be accommodated by a highly selective receptor, and provide the framework for the development of novel quorum-sensing regulators, utilizing the triphenyl scaffold.

Zou, Yaozhong; Nair, Satish K.; (UIUC)

2010-01-12

444

Sensing the ups and downs of Las Vegas: InSAR reveals structural control of land subsidence and aquifer-system deformation  

USGS Publications Warehouse

Land subsidence in Las Vegas, Nevada, United States, between April 1992 and December 1997 was measured using spaceborne interferometric synthetic aperture radar. The detailed deformation maps clearly show that the spatial extent of subsidence is controlled by geologic structures (faults) and sediment composition (clay thickness). The maximum detected subsidence during the 5.75 yr period is 19 cm. Comparison with leveling data indicates that the subsidence rates declined during the past decade as a result of rising ground-water levels brought about by a net reduction in ground-water extraction. Temporal analysis also detects seasonal subsidence and uplift patterns, which provide information about the elastic and inelastic properties of the aquifer system and their spatial variability.

Amelung, F.; Galloway, D. L.; Bell, J. W.; Zebker, H. A.; Laczniak, R. J.

1999-01-01

445

Water Resources Estimation of the Biosphere Reserve "Sierra de las Minas" in Guatemala, by Using a Distributed Hydrological Model and Considering Lack of Data  

NASA Astrophysics Data System (ADS)

The UNESCO Biosphere Reserve "Sierra de las Minas" is part of the Guatemalan System of Protected Areas and contains the largest cloud forests of Guatemala. Its southern slopes flow into the Motagua Valley, one of the more active zones in the country and paradoxically, the most arid and driest zone of Central America. The main objective of this work was to obtain a better estimation of the water resources coming from the southern slopes of the "Sierra de las Minas", and to have an analysis tool to better understand key hydrological processes involved on water sustainable management practices, as the environmental services initiatives on the zone. Unfortunately, the lack of data was the general framework. The selected model was the so called TETIS, which is a conceptual distributed model developed by our research group. A simple and efficient method was used for parameter maps estimation with a 100 m cell size. The model was calibrated at daily time step in the Teculután basin with 187 km2, by applying a new split-parameter structure coupled with the SCE-UA automatic optimization algorithm, in order to obtain the set of optimal correction factors of the model. For a period of medium daily precipitation within the validation period, we obtained a simulated discharge very close to the observed data (the monthly Nash and Sutcliffe model efficiency coefficient was 0.83). We present here a precipitation spatial and sensitivity analysis, and a simple approach for estimate the contribution of cloud forests to the hydrological balance. Finally, the calibration results were extrapolated to the Uyús ungaged basin to simulate its flow regime and to evaluate its water resources.

Morales-de La Cruz, M.; Frances Garcia, F.

2007-12-01

446

Estimates of hydraulic properties from a one-dimensional numerical model of vertical aquifer-system deformation, Lorenzi site, Las Vegas, Nevada  

USGS Publications Warehouse

Land subsidence related to aquifer-system compaction and ground-water withdrawals has been occurring in Las Vegas Valley, Nevada, since the 1930's, and by the late 1980's some areas in the valley had subsided more than 5 feet. Since the late 1980's, seasonal artificial-recharge programs have lessened the effects of summertime pumping on aquifer-system compaction, but the long-term trend of compaction continues in places. Since 1994, the U.S. Geological Survey has continuously monitored water-level changes in three piezometers and vertical aquifer-system deformation with a borehole extensometer at the Lorenzi site in Las Vegas, Nevada. A one-dimensional, numerical, ground-water flow model of the aquifer system below the Lorenzi site was developed for the period 1901-2000, to estimate aquitard vertical hydraulic conductivity, aquitard inelastic skeletal specific storage, and aquitard and aquifer elastic skeletal specific storage. Aquifer water-level data were used in the model as the aquifer-system stresses that controlled simulated vertical aquifer-system deformation. Nonlinear-regression methods were used to calibrate the model, utilizing estimated and measured aquifer-system deformation data to minimize a weighted least-squares objective function, and estimate optimal property values. Model results indicate that at the Lorenzi site, aquitard vertical hydraulic conductivity is 3 x 10-6 feet per day, aquitard inelastic skeletal specific storage is 4 x 10-5 per foot, aquitard elastic skeletal specific storage is 5 x 10-6 per foot, and aquifer elastic skeletal specific storage is 3 x 10-7 per foot. Regression statistics indicate that the model and data provided sufficient information to estimate the target properties, the model adequately simulated observed data, and the estimated property values are accurate and unique.

Pavelko, Michael T.

2004-01-01

447

U.S. Geological Survey Subsidence Interest Group Conference; proceedings of the Technical Meeting, Las Vegas, Nevada, February 14-16, 1995  

USGS Publications Warehouse

Introducation to Papers: This report is a compilation of short papers that are based on oral presentations summarizing the results of recent research that were given at the third meeting of the Subsidence Interest Group held in Las Vegas, Nevada, February 14?16, 1995. The report includes case studies of land subsidence and aquifer-system deformation resulting from fluid withdrawal, geothermal development, and mine collapse. Methods for monitoring land subsidence using Global Positioning System technology for the rapid and accurate measurement of changes in land-surface altitude also are described. The current status of numerical simulation of land subsidence in the USGS is summarized, and several of the short papers deal with the development and application of new numerical techniques for simulation and quantification of aquifersystem deformation. Not all oral presentations made at the meeting are documented in this report. Several of the presentations were of ongoing research and as such, the findings were provisional in nature and were offered at the meeting to stimulate scientific discussion and debate among colleagues. The information presented in this report, although only a subset of the proceedings of the meeting in Las Vegas, should help expand the scientific basis for management decisions to mitigate or control the effects of land subsidence. The short papers describing the results of these studies provide a cross section of ongoing research in aquifer mechanics and land subsidence and also form an assessment of the current technology and 'state of the science.' The analytical and interpretive methods described in this report will be useful to scientists involved in studies of ground-water hydraulics and aquifer-system deformation.

edited by Prince, Keith R.; Leake, Stanley A.

1997-01-01

448

Eruption and magma crystallization ages of Las Tres Vírgenes (Baja California) constrained by combined 230Th/238U and (U Th)/He dating of zircon  

NASA Astrophysics Data System (ADS)

Las Tres Vírgenes volcano is a calc-alkaline composite cone located near the main Gulf of California escarpment on the E coast of the Baja California peninsula. High-sensitivity ion microprobe U-series (230Th/238U) ages for zircon from La Vírgen tephra average 121- 10+ 12 ka (1?; MSWD = 2.7), with discrete age peaks at ˜ 100 and 160 ka. The noble gas mass spectrometric (U Th)/He zircon age, corrected for disequilibrium and pre-eruptive storage, is 36 ± 3 ka. This result for the eruption age of La Vírgen tephra is significantly older than previously postulated historic or Holocene ages that were based on an 18th century map reference and 14C dating of accidental charcoal, respectively. The new (U Th)/He zircon age is consistent with a > 26 ± 4 ka age derived from cosmogenic He exposure dating of an overlying basaltic lava flow [Hausback, B.P. and Abrams, M.J., 1996. Plinian eruption of La Virgen Tephra, Volcán Las Tres Virgenes, Baja California Sur, Mexico. Eos, Transactions, American Geophysical Union, 77(46, Suppl.): 813 814.]. U Pb zircon analysis of ignimbrites erupted from the adjacent Early Pleistocene La Reforma and El Aguajito calderas yielded ages of 1.38 ± 0.03 Ma (n = 12; MSWD = 1.0) and 1.17 ± 0.07 Ma (n = 23; MSWD = 1.3), respectively. No evidence for these ages is found among La Vírgen zircons, whereas pre-Quaternary zircon xenocrysts are common. The La Vírgen magma, therefore, evolved unrelated to Early Pleistocene magmatism in adjacent calderas, but assimilated local basement rocks. A gap between average Th U and (U Th)/He zircon ages suggests that zircon crystallization was discontinuous in the La Vírgen magma chamber. In addition, partial resorption of zircon suggests episodic thermal rejuvenation, most likely by basaltic recharge. Based on the zircon record, the > 100 ka lifetime of the thermal anomaly that sustained repeated intrusive pulses significantly exceeds the age of the last eruption. This strengthens the view that Tres Vírgenes has a potential for future eruptions.

Schmitt, Axel K.; Stockli, Daniel F.; Hausback, Brian P.

2006-11-01

449

INNOVATIVE MEANS OF DEALING WITH POTENTIAL SOURCES OF GROUND WATER CONTAMINATION: PROCEEDINGS OF THE NATIONAL GROUND WATER QUALITY SYMPOSIUM (7TH) HELD AT LAS VEGAS, NEVADA ON SEPTEMBER 26-28, 1984  

EPA Science Inventory

The Seventh National Ground Water Quality Symposium was held in Las Vegas, Nevada, on September 26-28, 1984. The symposium was dedicated to the memory of Mahdi S. Hantush (1921-1984), a pioneering scientist who specialized in the application of mathematics to solve transient grou...

450

Health Hazard Evaluation Report: HETA-2009-0121-3106, University Medical Center, Las Vegas, Navada, March 2010. Evaluation of Exposures to Healthcare Personnel from Cisplatin during a Mock Interperitoneal Operation.  

National Technical Information Service (NTIS)

On March 24, 2009, NIOSH received a management request for an HHE at the UMC, in Las Vegas, Nevada. The HHE request was submitted because a new medical procedure was being proposed, and some hospital staff were concerned about potential exposures to cispl...

G. Burr J. Couch

2010-01-01

451

DESARROLLO Y PROVISIÓN INICIAL DE ENTRENAMIENTO INTENSIVO EN LAS HABILIDADES SOCIALES Y PREPARACIÓN PARA EL TRABAJO EN ADULTOS CON TRAUMATISMO ENCÉFALO-CRANEAL: POSIBILIDADES DE REPLICACIÓN EN EL RÍO DE LA PLATA  

Microsoft Academic Search

Resumen Los déficit en habilidades sociales luego de traumatismo encéfalo-craneal severo son predominantes. Sin embargo, el desarrollo y la provisión de tratamientos preventivos durante el proceso de rehabilita- ción no han estado a la par de las necesidades en esta área. Este estudio describe el desarrollo conceptual y la provisión inicial de programas intensivos de entrenamiento de habilidades sociales y

THOMAS D. UPTON; PAOLA PREMUDA; JAMES BORDIERI

452

El lugar de las actividades físicas cooperativas en una programación de Educación Física por dominios de acción The place of physical activities in a cooperative program of physical education across domains of action  

Microsoft Academic Search

Resumen: En éste trabajo analizamos el lugar que deben ocupar las Actividades Físicas Cooperativas (AFC) en el currículum de Educación Física (EF) en el momento actual. En un primer apartado defendemos que la corriente que más nos puede ayudar a dotar a nuestra área de un mayor rigor y una lógica de funcionamiento a la hora de secuenciar los aprendizajes

Víctor Manuel López Pastor

453

The Guyanas = Las Guayanas. America = Las Americas [Series].  

ERIC Educational Resources Information Center

|Written for teachers to use with migrant children in elementary grades and to highlight the many Americas, this bilingual English/Spanish social studies resource booklet provides historical and cultural background information on the Guyanas--French Guyana, Surinam, and Guyana. A table of contents indicates the language--Spanish or English--in…

Toro, Leonor

454

Remote Sensing Study - Las Vegas Wash Basin, Las Vegas, Nevada.  

National Technical Information Service (NTIS)

The aerial reconnaissance program reports were designed to fulfill the following objectives: Establish the presence of and discharge patterns for the pollutant seepage; establish the presence of industrial/municipal wastes entering the Wash; locate and do...

1972-01-01

455

Substitution of active-site His-223 in Pseudomonas aeruginosa elastase and expression of the mutated lasB alleles in Escherichia coli show evidence for autoproteolytic processing of proelastase.  

PubMed Central

The neutral metalloprotease elastase is one of the major proteins secreted into the culture medium by many Pseudomonas aeruginosa strains. Encoded by the lasB gene, the 33-kDa elastase is initially synthesized as a 53-kDa preproenzyme which is processed to the mature form via a 51-kDa proelastase intermediate. To facilitate studies on proteolytic processing of elastase precursors and on secretion, we developed systems for overexpression of lasB in Escherichia coli under the control of the inducible T7 and tac promoters. Although the 51-kDa proelastase form was detectable in E. coli under inducible conditions, most of the elastase produced under these conditions was found in an enzymatically active 33-kDa form. The amino-terminal sequence of the first 15 amino acid residues of this 33-kDa elastase species was identical to that of the mature P. aeruginosa enzyme, suggesting that processing was autocatalytic. To test this possibility, the codon in lasB encoding His-223, a presumed active-site residue, was changed to encode Asp-223 (lasB1) and Tyr-223 (lasB2). The effects of these mutations on enzyme activity and processing were examined. No proteolytic or elastolytic activities were detected in extracts of E. coli cells containing the lasB mutant alleles. Overexpression of the mutated lasB genes in E. coli resulted in the accumulation of the corresponding 51-kDa proelastase species. These were processed in vitro to the respective 33-kDa forms by incubation with exogenous purified elastase, without an increase in proteolytic activity. Molecular modeling studies suggest that the mutations have little or no effect on the conformation of the mutant elastases. In addition, wild-type elastase and the mutant proelastases were localized to the periplasm of E. coli. The present results confirm that His-223 is essential for elastase activity and provide evidence for autoproteolytic processing of proelastase. Images FIG. 2 FIG. 4A FIG. 4B FIG. 4C FIG. 5 FIG. 6

McIver, K; Kessler, E; Ohman, D E

1991-01-01

456

Risk of exposure to second hand smoke for adolescents in Las Vegas casinos: an evaluation of the Nevada Clean Indoor Air Act.  

PubMed

Since the Surgeon General's groundbreaking report of 1964, "Smoking and Health," the medical and scientific communities have uncovered the devastating effects of tobacco smoke on health. In reaction to these findings, local and state governments have enacted a variety of clean air acts to prevent unnecessary exposure to this known carcinogen. The Nevada Clean Indoor Air Act (NCIAA), a non-comprehensive smoke-free law, permits smoking in designated areas of casinos, bars, and taverns. With many Las Vegas casinos catering to all ages, this study was designed to evaluate the efficacy of NCIAA in protecting children from second hand smoke exposure. Using a device that measures ambient air particle matter concentrations, this study sampled the air quality in 15 casino gaming areas and corresponding non-smoking, children-friendly areas. The results indicate that current policy fails to preserve indoor air quality in these children-friendly areas. Furthermore, this research suggests the adoption of a more comprehensive, 100% smoke-free policy as the only effective remedy. PMID:23113419

Cochran, Christopher; Henriques, Dominic; York, Nancy; Lee, Kiyoung

2012-01-01

457

LISTA PRELIMINAR COMENTADA DE LAS \\  

Microsoft Academic Search

A preliminary annotated list of the leafhoppers collected at Fundo Genova, Chanchamayo province and Fundo Santa Teresa, Satipo province, Peru, is presented. A total of 46 species is reported, 28 in the subfamily Cicadellinae, 9 in the subfamily Deltocephalinae, 4 in the subfamily Agalliinae, 1 in the subfamily Gyponinae, 2 in the subfamily Ledrinae, 1 in the subfamily Nioniinae, and

Pedro W. Lozada Robles; Germán A. Arellano Cruz

458

Ecuador. America = Las Americas [Series].  

ERIC Educational Resources Information Center

|Designed for elementary teachers to use with migrant students, this bilingual English/Spanish social studies resource booklet provides an encyclopedia-style overview of Ecuador's history, geography, economy, and culture. Topics include the history of Ecuador's flag and coat of arms, geographic regions, food, Quito (the capital), recent wildlife…

Toro, Leonor; Doran, Sandra

459

A LAS PREGUNTAS EPISTEMOLOGICAS BASICASl  

Microsoft Academic Search

Because of academic, scientific and social variables the examination of the different behaviorisms categories is necessary in an epistemological framework. This article presents a comparison between J. R. Kantor's Interbehaviorism and B. F. Skinner's Radical Behaviorism. The questions from which these authors postures are identified and their historical evolution are: (1) ¿What is knowledge?, (2) ¿What is known?, (3) ¿How

BLANCA PATRICIA BALLESTEROS; AMANDA REY

2001-01-01

460

OA01.13. An evaluation on mutra taila bindu pariksha with a modified device in LAS01 (a herbo-mineral compound) treated cancer patients  

PubMed Central

Purpose: Ashtavidh rogi pariksha one of the main diagnostic methods described in Ayurveda includes Mutra Taila Bindu Pariksha (MTBP), which is simple and cost effective. Modern diagnostic investigations of tumor markers and radiological procedures are costly and usual tests for recording different stages of cancer. MTBP is also used at Lavanya Ayurvedic Hospital in Cancer patients as diagnostic and prognostic parameters. Test depends on pattern of spreading of oil drop over surface of patient's urine. Method: This procedure was modified keeping all parameters fixed like distance at which sesame oil falls and procedure of collection of urine sample. This equipment was attached with a photographic device. 50 randomly selected cases were divided into two groups. Group I consisted of 10 healthy volunteers and group II consisted of 40 pre diagnosed cases of different types of cancer. Patients were made to sleep at 9 PM. On next morning (5 AM) mid stream urine of the first urination was collected in a standard sized beaker of 250 ml. Sample beaker was kept in a specifically designed glass and fibre cabinet, which was devoid of air. A 10 ml glass burette filled with Tila taila (Sesame oil) was fixed over beaker containing urine. One drop of sesame oil was dropped over the stable surface of urine from a distance of 2 cm. The oil drop dispersal pattern on the surface of collected urine sample was recorded photographically. It was analysed periodically at monthly intervals for three times. Result: The results of oil spreading nature, direction and shape over urine surface were compared with modern biochemical, haematological and radiological parameters in different stages of cancer. Conclusion: The pattern of dispersal of sesame oil was progressively changed in relation to the improvement in subjective and bjective parameters in LAS01 treated cases.

Sharma, Vinamra; Tiwari, Anoop; Tripathi, Rajesh; Srivastava, Ashok; Saxena, R C; Trivedi, V. P.

2012-01-01

461

MAS-NMR investigations of the crystallization behaviour of lithium aluminum silicate (LAS) glasses containing P2O5 and TiO2 nucleants  

NASA Astrophysics Data System (ADS)

Lithium aluminum silicate (LAS) glass of composition (mol%) 20.4Li2O-4.0Al2O3-68.6SiO2-3.0K2O-2.6B2O3-0.5P2O5-0.9TiO2 was prepared by melt quenching. The glass was then nucleated and crystallized based on differential thermal analysis (DTA) data and was characterized by 29Si, 31P, 11B and 27Al MAS-NMR. XRD and 29Si NMR showed that lithium metasilicate (Li2SiO3) is the first phase to c form followed by cristobalite (SiO2) and lithium disilicate (Li2Si2O5). 29Si MAS-NMR revealed a change in the network structure already for the glasses nucleated at 550 °C. Since crystalline Li3PO4, as observed by 31P MAS-NMR, forms concurrently with the silicate phases, we conclude that crystalline Li3PO4 does not act as a nucleating agent for lithium silicate phases. Moreover, 31P NMR indicates the formation of M-PO4 (M=B, Al or Ti) complexes. The presence of BO3 and BO4 structural units in all the glass/glass-ceramic samples is revealed through 11B MAS-NMR. B remains in the residual glass and the crystallization of silicate phases causes a reduction in the number of alkali ions available for charge compensation. As a result, the number of trigonally coordinated B (BO3) increases at the expense of tetrahedrally coordinated B (BO4). The 27Al MAS-NMR spectra indicate the presence of tetrahedrally coordinated Al species, which are only slightly perturbed by the crystallization.

Ananthanarayanan, A.; Kothiyal, G. P.; Montagne, L.; Revel, B.

2010-06-01

462

In vitro biotransformation of surfactants in fish. Part I: linear alkylbenzene sulfonate (C12-LAS) and alcohol ethoxylate (C13EO8).  

PubMed

Developing regulatory activities (e.g., REACh, [DGEE. 2003. Directorates General Enterprise and Environment. The new EU chemicals legislation REACH. DG Enterprise, Brussels, Belgium. (http://www.europa.eu.int/comm/enterprise/reach/index_en.htm)]) will require bioaccumulation to be assessed for thousands of chemicals. Further, there is increasing pressure to reduce, refine or replace animal tests. Given this scenario, there is an urgent need to evaluate the feasibility of in vitro systems to supply data useful for bioaccumulation estimation. Subcellular and cellular hepatic systems were tested to determine the biotransformation of two surfactants: C12-2-LAS (2-phenyl dodecane p-sulfonate) and an alcohol ethoxylate C13EO8 (Octaethylene glycol monotridecyl ether). The subcellular systems tested were liver homogenates and microsomes from the common carp (Cyprinus carpio) and rainbow trout (Oncorhynchus mykiss). Cellular systems consisted of primary hepatocytes from the common carp (Cyprinus carpio) and PLHC-1 cells, hepatocarcinoma cells from the desert topminnow (Poeciliopsis lucida). All in vitro systems were exposed to radiolabeled test compounds and assayed for biotransformation using liquid scintillation and thin layer chromatographic methods. First-order kinetics were used to estimate rates of biotransformation. Bioconcentration of test materials in fish were predicted using an in vitro to in vivo metabolic rate extrapolation model linked to a mass-balance model commonly used to predict bioaccumulation in fish. Subcellular biotransformation rates for each of the surfactants were greatest with microsomes. Cellular loss rates exceeded subcellular rates, leading to lower predicted BCF values. Predicted BCFs corresponded closely to measured values in several fish species, verifying the utility of in vitro systems in refining Kow-only-based BCFs via the inclusion of biotransformation rates. PMID:18407314

Dyer, Scott D; Bernhard, Mary Jo; Cowan-Ellsberry, Christina; Perdu-Durand, Elisabeth; Demmerle, Susanne; Cravedi, Jean-Pierre

2008-04-14

463

1-Dodecane-sulfonic-acid-sodium-salt(LAS) assisted hydrothermal synthesis of Cd{sub x}Zn{sub 1-x}S solid solution as efficient photocatalysts under visible light irradiation  

SciTech Connect

With anionic surfactant LAS assisted, series of zinc cadmium sulfide semiconductor photocatalysts were synthesized by hydrothermal method. These products were characterized by X-ray diffraction (XRD), UV-Vis absorption spectra (UV-Vis) and scanning electron microscopy (FESEM). The photocatalytic activities of as-prepared samples were evaluated by photocatalytic hydrogen production from water under visible-light irradiation. The best synthesis parameters are: Composition 0.9:0.1 (Cd:Zn molar ratio), Temperature 160 deg. C, Hydrothermal Time 48 Hour, LAS Concentration 1.7 mmol/L, the maximum visible-light-catalytic hydrogen production rate is 161.25 {mu}mol/h (lambda>430 nm) which is higher than those of by coprecipitation method. The experiment results indicate that surfactant assisted hydrothermal method is an effective way to get highly active CdZnS solid solution photocatalyst.

Jia, B.; Guo, L. J. [State Key Laboratory of Multiphase Flow in power Engineering, Xi'an Jiaotong University (China)

2010-03-01

464

Derivation of predicted no effect concentrations (PNEC) for marine environmental risk assessment: Application of different approaches to the model contaminant Linear Alkylbenzene Sulphonates (LAS) in a site-specific environment  

Microsoft Academic Search

Four sediment-dwelling marine organisms were exposed to sediments spiked with increasing concentrations of Linear Alkylbenzene Sulphonate (LAS). The selected endpoint mortality was reported daily and acute LC50 (96 h), as well as final LC10 values were calculated for the derivation of environmentally safe predicted no effect concentrations (PNEC) for the sediment compartment. PNECs were estimated by both application of assessment factors

M. Hampel; E. González-Mazo; C. Vale; J. Blasco

2007-01-01

465

Single-particle laser-induced-fluorescence spectra of biological and other organic-carbon aerosols in the atmosphere: Measurements at New Haven, Connecticut, and Las Cruces, New Mexico  

NASA Astrophysics Data System (ADS)

This study focuses on organic carbon (OC) aerosols, including natural biological aerosols, in the Earth's troposphere, and on laser-induced fluorescence (LIF) spectral methods for studying these aerosols. LIF spectra of atmospheric OC and biological aerosols (having diameters greater than approximately 3 ?m) measured at New Haven, Connecticut, and Las Cruces, New Mexico, are reported. A hierarchical clustering method was used to cluster approximately 90% of the single-particle LIF spectra into 8-10 groups. Some of these groups have spectra that are similar to spectra of some important classes of atmospheric aerosol, such as humic/fulvic acids and humic-like substances, bacteria, cellulose, marine aerosol, and polycyclic aromatic hydrocarbons (PAH). A comparison with previous measurements made at Adelphi, Maryland, reveals that the most highly populated clusters found at Adelphi, and some of the less populated ones, also appear in the LIF spectra at New Haven and Las Cruces, even though the regional climates at these locations is different (New England/Atlantic Coastal, for New Haven and Adelphi, and Chihuahuan Desert for Las Cruces), and the measurements were made in different seasons. The results are consistent with some (perhaps most) of the fluorors in OC and biological atmospheric aerosols being common to these three sites. On average, spectra characteristic of humic/fulvic acids and humic-like substances (HULIS) comprise 28-43% of fluorescent particles at all three sites; whereas cellulose-like spectra contribute only 1-3%.

Pan, Yong-Le; Pinnick, Ronald G.; Hill, Steven C.; Rosen, James M.; Chang, Richard K.

2007-12-01

466

Mechanized and Natural Soil-to-Air Transfer of Trifluralin and Prometryn from a Cotton Field in Las Cruces, New Mexico.  

PubMed

Two pre-emergence herbicides (trifluralin and prometryn) were applied on a cotton field in Las Cruces, New Mexico, and their atmospheric particle and gas-phase concentrations were measured during mechanized soil preparation and natural wind erosion sampling events before and after herbicide application. Air sampling was conducted using samplers mounted at various heights from the ground and at various locations on the field. During mechanized soil management with a disk harrow, sampling occurred at two distances from the tractor ("near-source", 4 m downwind and "far-source", 20-100 m from the disking tractor). Natural background (no disking) sampling events occurred during daytime and at night. Both herbicides were quantifiable for all postapplication sampling events, including background sampling that occurred 8, 38, and 40 days after herbicide application. Average concentrations in both the gas and particle phases ranged from about 10 to 350 ng/m(3). Averaging by event type, mean total prometryn concentrations were 2 (night background) to 8 (near-source) times higher than the corresponding trifluralin concentrations. Prometryn/trifluralin ratios were higher in airborne samples than in soil, indicative of trifluralin losses during daytime sampling, possibly via atmospheric reactions. Prometryn particle phase mass fractions were generally higher than those for trifluralin for all sampling events, consistent with Kair/soil-oc partition coefficients, and particle-phase mass fractions were higher for near-source disking and daytime background sampling compared to far-source and nighttime. Daytime natural background prometryn concentrations could be as high as those measured during disking, and background samples showed significant relationships to meteorological parameters (air temperature, relative humidity, and dewpoint). Mechanical disturbance by tilling operations reduced the ability to predict airborne herbicide concentrations on the basis of meteorological conditions. Prometryn concentrations were higher for larger particle sizes (Dp > 1.8 ?m), while no clear patterns with particle size were observed for trifluralin. Trifluralin concentrations in the smallest size bin (PM0.18) were 2-50 times higher than prometryn for the three disking events where an impactor was used, indicating the importance of measuring size-resolved herbicide distributions in future studies. PMID:24040758

Holmén, Britt A; Kasumba, John; Hiscox, April; Wang, Junming; Miller, David

2013-10-02

467

Ground-water quality and geochemistry of Las Vegas Valley, Clark County, Nevada, 1981-83; implementation of a monitoring network  

USGS Publications Warehouse

As a result of rapid urban growth in Las Vegas Valley, rates of water use and wastewater disposal have grown rapidly during the last 25 years. Concern has developed over the potential water quality effects of this growth. The deep percolation of wastewater and irrigation return flow (much of which originates as imported water from Lake Mead), along with severe overdraft conditions in the principal aquifers of the valley, could combine to pose a long-term threat to groundwater quality. The quantitative investigations of groundwater quality and geochemical conditions in the valley necessary to address these concerns would include the establishment of data collection networks on a valley-wide scale that differ substantially from existing networks. The valley-wide networks would have a uniform areal distribution of sampling sites, would sample from all major depth zones, and would entail repeated sampling from each site. With these criteria in mind, 40 wells were chosen for inclusion in a demonstration monitoring network. Groundwater in the northern half of the valley generally contains 200 to 400 mg/L of dissolved solids, and is dominated by calcium, magnesium , and bicarbonate ions, reflecting a chemical equilibrium between the groundwater and the dominantly carbonate rocks in the aquifers of this area. The intermediate to deep groundwater in the southern half of the valley is of poorer quality (containing 700 to 1,500 mg/L of dissolved solids) and is dominated by calcium, magnesium, sulfate, and bicarbonate ions, reflecting the occurrence of other rock types including evaporite minerals among the still-dominant carbonate rocks in the aquifers of this part of the valley. The poorest quality groundwater in the valley is generally in the lowland parts of the valley in the first few feet beneath the water table, where dissolved solids concentrations range from 2,000 to > 7,000 mg/L , and probably reflects the effects of evaporite dissolution, secondary recharge, and evapotranspiration. The most common water quality constraint on potential groundwater use is the high salinity. No evidence of large-scale contamination of deep groundwater was found in this study. (Author 's abstract)

Dettinger, M. D.

1987-01-01

468

EL CULTO K EN LA ERA CONTEMPORANEA: CRÓNICA, GÉNESIS Y APOTEOSIS DEL PROCESO KIRCHNERISTA  

Microsoft Academic Search

Desde el año 2003, con la asunción de N. Kirchner y posterior relevo de su mujer Cristina F. de Kirchner la Argentina ha experimentado una nueva razón para creer en la política pero a un costo muy alto. El trauma inicial que subsumió a la Argentina en grandes tasas de pobreza y desocupación consolidaron las bases para el nacimiento de

Maximiliano E. Korstanje

2011-01-01

469

Using Intervention Mapping as a Participatory Strategy: Development of a Cervical Cancer Screening Intervention for Hispanic Women  

ERIC Educational Resources Information Center

|Cervical cancer is preventable with treatment of precancerous lesions and treatable at early stages. Hispanics have higher rates of cervical cancer and lower rates of screening. "Ayndando a las Mujeres con Informaccion, Guia, y Amor para su Salud" (AMIGAS) is an intervention to increase cervical cancer screening in U.S. women of Mexican origin.…

Byrd, Theresa L.; Wilson, Katherine M.; Smith, Judith Lee; Heckert, Andrea; Orians, Carlyn E.; Vernon, Sally W.; Fernandez-Esquer, Maria E.; Fernandez, Maria E.

2012-01-01

470

Preguntas y respuestas acerca del Estudio del Tamoxifeno y Raloxifeno (STAR)  

Cancer.gov

El Estudio del Tamoxifeno y Raloxifeno (STAR, por sus siglas en inglés) es un estudio clínico (un estudio de investigación conducido con voluntarios) diseñado para ver cómo el medicamento raloxifeno (Evista®) se compara con el medicamento tamoxifeno (Nolvadex®) en reducir la incidencia de cáncer del seno en las mujeres con alto riesgo de desarrollar la enfermedad.

471

Women of Mexico: The Consecrated and the Commoners, 1519-1900. La Mujer Latina Series.  

ERIC Educational Resources Information Center

|This collective biography offers insight into the more famous and infamous women in Mexico's history and weaves the tale of how their ways and deeds have shaped both a culture and a nation. The book starts with the conquest and ends with the twentieth century, outlining the lives of Mexican women and their causes. The women described in the book…

Gugliotta, Bobette

472

Manifestaciones de la Violencia Doméstica en una Muestra de Hombres Homosexuales y Mujeres Lesbianas Puertorriqueñas  

Microsoft Academic Search

This study analyzed a lesbian, gay, bisexual and transgender sample in Puerto Rico that experience domestic violence. The sample consists of 201 lesbian and gay subjects selected by availability that have been living together for sixth or more months. Findings suggest that psychological and physical abuse was statistically significant in the lesbian subjects. Sexual abuse was statistically significant in the

Felipe Reyes Mena; José R. Rodríguez; Sarah Malavé; San Juan

2005-01-01

473

Aceptabilidad a suplementos nutricios en mujeres embarazadas o lactando y niños menores de cinco años  

Microsoft Academic Search

Objective. The present study explores the acceptance and consumption of nutritional supplements that form part of a governmental program to support nutritionally vulnerable groups. Material and Methods. Pregnant and lactating women, and mothers of malnourished toddlers, infants and children were interviewed. Data were collected, after in- troduction with an interview guide with an open-ended for- mat, through face-to-face interviews conducted

Homero Martínez; Lourdes Campero; Guadalupe Rodríguez; Juan Rivera

1999-01-01

474

Significado de los cambios en los senos: Guía para la salud de la mujer  

Cancer.gov

E-book que describe los cambios o padecimientos específicos de los senos e incluye información sobre cómo se detectan, diagnostican y tratan estos cambios. Aquí se explica que si bien la mayoría de los cambios en los senos no son cancerosos, estos deben ser examinados por un médico. También se ofrece información sobre los pasos a seguir después de un resultado anormal de una mamografía y se incluye una lista de preguntas para el doctor.

475

A Standards-Based Thematic Unit: "La Mujer Que Brillaba Aun Mas Que el Sol"  

ERIC Educational Resources Information Center

This unit was created as a result of a summer institute sponsored by the National K-12 Foreign Language Resource Center at Iowa State University, Ames, Iowa. The Center's goal is to improve student learning of foreign languages in kindergarten through twelfth grade (K-12). To this end, the Center provides professional support for foreign language…

Bullitt, Leslie Kay; Gonzalez, Augusta C.; Luna, Boni

1998-01-01

476

La representación del cuerpo de la mujer en la publicidad de revistas femeninas  

Microsoft Academic Search

This work involves the analysis of the use made by luxury fashion brand graphic advertising of women's bodies in the main trendy woman's magazines. On the one hand, the physical and aesthetic models associated with the female body are approached from the point of view of nonverbal communication. On the other, the said models are related to the social importance

MARÍA DOLORES CÁCERES ZAPATERO; PALOMA DÍAZ SOLOAGA

477

Mano a Mano Mujer: An Effective HIV Prevention for Chilean Women  

PubMed Central

The impact of a professionally-facilitated peer group intervention for HIV prevention among 400 low income Chilean women was examined using a quasi-experimental design. At three months post-intervention, the intervention group had higher HIV-related knowledge, more positive attitudes towards people living with HIV, fewer perceived condom use barriers, greater self-efficacy, higher HIV reduction behavioral intentions, more communication with partners about safer sex, and decreased depression symptoms. However, they did not have increased condom use or self-esteem. More attention to gender barriers is needed. This intervention offers a model for reducing HIV for women in Chile and other Latin American countries.

Cianelli, Rosina; Ferrer, Lilian; Norr, Kathleen F.; Miner, Sarah; Irarrazabal, Lisette; Bernales, Margarita; Peragallo, Nilda; Levy, Judith; Norr, James L.; McElmurry, Beverly

2012-01-01

478

EFECTOS SOBRE LA ENFERMEDAD CARDIOVASCULAR DE LA TERAPIA HORMONAL DE REEMPLAZO EN LA MUJER CLIMATERICA: ACTUALIZACION  

Microsoft Academic Search

THE HORMONE REPLACEMENT THERAPY EFFECTS ON CARDIOVASCULAR DISEASE IN CLIMATERIC WOMAN The reason of this review is that when being coronary heart disease (CHD) the main cause of morbility and mortality in 65 years older women from west countries (45 % of the deaths) and to exist controversy in the prescription of the hormone replacement therapy (HRT) for primary and

Luis Daniel Navarro

479

A Standards-Based Thematic Unit: "La Mujer Que Brillaba Aun Mas Que el Sol"  

ERIC Educational Resources Information Center

|This unit was created as a result of a summer institute sponsored by the National K-12 Foreign Language Resource Center at Iowa State University, Ames, Iowa. The Center's goal is to improve student learning of foreign languages in kindergarten through twelfth grade (K-12). To this end, the Center provides professional support for foreign language…

Bullitt, Leslie Kay; Gonzalez, Augusta C.; Luna, Boni

1998-01-01

480

El consumo femenino de la imagen de la mujer en la publicidad  

Microsoft Academic Search

This article presents the results of research into the per- ceptions and attitudes of women with regard to gender representations in advertising discourse. This study is part of a research project begun in 2005 on the subject of the consumption of the image of women in advertising and the media carried out by the Catalan Institute of Women (ICD) of

Núria García-Muñoz; Luisa Martínez

2009-01-01