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Sample records for sater ross katherine

  1. The Trial of Katherine Harrison.

    Science.gov (United States)

    Woodward, Walter W.

    2003-01-01

    Presents a lesson plan in which the teacher and students participate in a mock trial of Katherine Harrison, who was accused of witchcraft in the seventeenth century. Provides background information about the trial, as well as primary sources of the testimonies given by witnesses during the trial. (CMK)

  2. The Trial of Katherine Harrison.

    Science.gov (United States)

    Woodward, Walter W.

    2003-01-01

    Presents a lesson plan in which the teacher and students participate in a mock trial of Katherine Harrison, who was accused of witchcraft in the seventeenth century. Provides background information about the trial, as well as primary sources of the testimonies given by witnesses during the trial. (CMK)

  3. Pós-dradiviano Sateré-Mawé: parentesco y rituales de afinabiliadad

    OpenAIRE

    Alvarez,Gabriel O.

    2011-01-01

    El material etnográfico Sateré-Mawé fue analizado por la perspectiva de diferentes tradiciones teóricas de antropología del parentesco. El análisis del sistema de parentesco Sateré-Mawé permite cubrir un vacío bibliográfico acerca de la temática y también será la puerta de acceso que permitirá trascender el ámbito de los términos de parentesco para la comprehensión de la alteridad. Las conclusiones teóricas en el campo del parentesco, permiten una interpretación del ritual de la tucandira, qu...

  4. Katherine Brooke'ist / Tiina Lepiste

    Index Scriptorium Estoniae

    Lepiste, Tiina

    2007-01-01

    Ameerika teleseriaali "Vaprad ja ilusad" ("The Bold and the Beautiful") osatäitja Katherine Kelly Lang (Brooke). Artikli aluseks on Soap Opera Weekly ajakirjaniku Linda Susmani vestlus näitlejannaga

  5. Katherine Brooke'ist / Tiina Lepiste

    Index Scriptorium Estoniae

    Lepiste, Tiina

    2007-01-01

    Ameerika teleseriaali "Vaprad ja ilusad" ("The Bold and the Beautiful") osatäitja Katherine Kelly Lang (Brooke). Artikli aluseks on Soap Opera Weekly ajakirjaniku Linda Susmani vestlus näitlejannaga

  6. Demografia de um povo indígena da Amazônia brasileira: os sateré-mawé

    Directory of Open Access Journals (Sweden)

    Pery Teixeira

    2011-12-01

    Full Text Available Um levantamento sociodemográfico censitário participativo sobre a população sateré-mawé, realizado em 2002 e 2003, em duas terras indígenas e em quatro cidades situadas no oeste do Estado do Amazonas, revelou informações de relevância para a compreensão das características demográficas, econômicas, sociais e culturais daquele povo indígena. No cômputo geral, foram contados e entrevistados 7.502 indígenas nas terras indígenas e 998 nas áreas urbanas. O presente trabalho procura analisar a parcela dos dados levantados no que se refere às características sociodemográficas dos sateré-mawé, incluindo-se a estrutura etária e por sexo, a fecundidade, a mortalidade e a migração. O povo sateré-mawé apresenta uma repartição etária jovem, fruto de uma fecundidade elevada e de uma população idosa reduzida. Percebem-se intensos fluxos migratórios tanto no interior das terras indígenas onde habitam os sateré-mawé como em direção às cidades próximas, fluxos esses de caráter relativamente recente. Por sua vez, a mortalidade infantil no território indígena é elevada e espacialmente diferenciada, sendo maior nas cabeceiras de um dos dois principais rios que cortam o território sateré-mawé. Alguns elementos de determinação dos níveis e dos diferenciais da mortalidade das crianças são encontrados nas características socioeconômicas, de infraestrutura e nutricionais do povo sateré-mawé.

  7. Katherine Anne Porter on Her Contemporaries.

    Science.gov (United States)

    Bridges, Phyllis

    Personal experiences with and critical judgments of leading artists and intellectuals of the twentieth century are recorded in Katherine Anne Porter's essays, letters and conversations which provide snapshots of her attitudes and encounters. Porter's commentaries about such contemporaries as Ernest Hemingway, William Faulkner, Saul Bellow,…

  8. Katherine Anne Porter on Her Contemporaries.

    Science.gov (United States)

    Bridges, Phyllis

    Personal experiences with and critical judgments of leading artists and intellectuals of the twentieth century are recorded in Katherine Anne Porter's essays, letters and conversations which provide snapshots of her attitudes and encounters. Porter's commentaries about such contemporaries as Ernest Hemingway, William Faulkner, Saul Bellow,…

  9. Alf Ross

    DEFF Research Database (Denmark)

    Ryberg, Jesper

    En (overvejende) ny generation af akademikere møder og prøver Ross' tanker om emner som retfærdighed, demokrati, statsforfatningsret, ytringsfrihed, straf, erkendelsesteori, etik, logik, fri vilje og sygdom....

  10. Ross og demokratiet

    DEFF Research Database (Denmark)

    Svensson, Palle

    2006-01-01

    En kritisk analyse af Alf Ross' teori om demokrati på grundlag af Roberty A. Dahl's begrebsapparat.......En kritisk analyse af Alf Ross' teori om demokrati på grundlag af Roberty A. Dahl's begrebsapparat....

  11. Ross - for altid?

    DEFF Research Database (Denmark)

    Blume, Peter Erik

    2011-01-01

    Med baggrund i Jens Ewalds bog om Alf Ross omtaler artiklen en række de problemstillinger, som bogen behandler, samt vurderer den betydning, Ross har haft og måske fortsat har. Afslutningsvis betones den juridiske biografis betydning.......Med baggrund i Jens Ewalds bog om Alf Ross omtaler artiklen en række de problemstillinger, som bogen behandler, samt vurderer den betydning, Ross har haft og måske fortsat har. Afslutningsvis betones den juridiske biografis betydning....

  12. Ross og erkendelsesteorien

    DEFF Research Database (Denmark)

    Holtermann, Jakob von Holderstein

    2006-01-01

    Et argument for at den logiske positivismes notoriske problemer ikke - som almindeligt antaget - har gjort Alf Ross' retsfilosofi forældet. Mere konkret påvises det at Ross i virkeligheden passer bedre sammen med den empiriske erkendelsesteori der har rejst sig på den logiske positivismes ruiner....

  13. Victoria Land, Ross Sea, and Ross Ice Shelf, Antarctica

    Science.gov (United States)

    2002-01-01

    On December 19, 2001, MODIS acquired data that produced this image of Antarctica's Victoria Land, Ross Ice Shelf, and the Ross Sea. The coastline that runs up and down along the left side of the image denotes where Victoria Land (left) meets the Ross Ice Shelf (right). The Ross Ice Shelf is the world's largest floating body of ice, approximately the same size as France. Credit: Jacques Descloitres, MODIS Land Rapid Response Team, NASA/GSFC

  14. The ROSS Language Manual.

    Science.gov (United States)

    1982-09-01

    when receiving (Mary requests meeting) (tell Mary meet for lunch at Superfood ) (tell Eunice bring stock reports) (tell Secretary cancel other lunch...someone requests meeting) (if (equal ’stockbroker (ask !someone recall your occupation)) then (tell ?someone meet for lunch at Superfood ) (tell...meet for lunch at Superfood ). Several other prefixes commonly used when writing ROSS code, either to control evaluation or to dictate variables in

  15. Dance anthropology and the impact of 1930s Haiti on Katherine Dunham's scientific and artistic consciousness

    OpenAIRE

    2011-01-01

    Katherine Dunham (1909-2006) was one of the most critically and commercially successful dancers of the twentieth century. She established and ran the Katherine Dunham Dance Company, the earliest self-supporting predominantly black dance company and one of the first modern dance troupes to achieve international success. She was also one of the first African Americans to conduct anthropological fieldwork, and the first anthropologist to explore the function of dance in rituals and community lif...

  16. Bandura, Ross, and Ross: Observational Learning and the Bobo Doll

    Science.gov (United States)

    Artino, Anthony R., Jr.

    2007-01-01

    Since the publication of their seminal article entitled, "Transmission of Aggression Through Imitation of Aggressive Models" (Bandura, Ross, & Ross, 1961), the work of Albert Bandura and his co-authors has had an immeasurable impact on the field of psychology, in general, and educational psychology, more specifically. The purpose of this report is…

  17. Antarctica - Ross Ice Shelf

    Science.gov (United States)

    1990-01-01

    This color picture of Antarctica is one part of a mosaic of pictures covering the entire polar continent taken during the hours following Galileo's historic first encounter with its home planet. The view shows the Ross Ice Shelf to the right and its border with the sea. An occasional mountain can be seen poking through the ice near the McMurdo Station. It is late spring in Antarctica, so the sun never sets on the frigid, icy continent. This picture was taken about 6:20 p.m. PST on December 8, 1990. From top to bottom, the frame looks across about half of Antarctica.

  18. William F. Sater, La imagen heroica de Chile: Arturo Prat, santo secular, Santiago, Centro de Estudios Bicentenario, 2005, 231 págs.

    Directory of Open Access Journals (Sweden)

    SANTIAGO ARÁNGUIZ PINTO

    2011-10-01

    Full Text Available LA PERSONA Y LA FIGURA de Arturo Prat parece que, a simple vista, representan una misma y única unidad. Pero, si profundizamos algo más en la vida de este marino y abogado, nos daremos cuenta de que sus datos biográficos y la percepción que tuvo la sociedad de éste, varían considerablemente, pues, por su misma condición de héroe, está sujeto a los vaivenes interpretativos propios de la sobreabundante mitología nacional. Y es que el héroe, dice Sater, plantea otras problemáticas y disyuntivas cuando se le estudia, diferente a las del hombre público que posee figuración o renombre. En el héroe, por el contrario, confluyen elementos que responden a otro tipo de variables sociales, espirituales y culturales, y que es, por cierto, la preocupación fundamental que se ha propuesto desarrollar en este libro el historiador norteamericano. Analizar, comprender o estudiar la imagen heroica de Prat exige la participación de otros elementos analíticos que, a su vez, se plantean en relación a determinados momentos de la historia de Chile. No hay dudas al respecto: a nadie dejaba indiferente los rasgos y virtudes que desprendía la cautivante personalidad de Prat, considerando que éste era un ejemplo único de abnegación, heroísmo y de entrega hacia su patria, digno de imitar y difundir hacia el resto de la sociedad. Cada vez que ocurría alguna desgracia, el país requería a su vez de un estímulo moral para superar los problemas nacionales. ¿Cómo lograrlo? Recurriendo a Prat, que luego se transformaría en una práctica común, que excedió los límites de la mesura y el entendimiento.

  19. Symbolism--The Main Artistic Style of Katherine Anne Porter's Short Stories

    Science.gov (United States)

    Wang, Ru

    2010-01-01

    The paper takes Katherine Anne Porter's two short stories: "Flowering Judas", "The Grave" as objects of study. It will try to analyze Porter's writing style through her imaginary conception, vivid psychological description and multiple symbolisms so that we can understand her studies and her attitudes to female psychological…

  20. Skills Planning for Industry Growth: A Case Study of the Katherine Arts Industry. Occasional Paper

    Science.gov (United States)

    Curry, Catherine

    2009-01-01

    The findings of a cultural industries skills audit undertaken in 2008 in Katherine, Northern Territory, are explored. The case study focusses in particular on the practical challenges and implications of auditing skills in a diverse industry sector and considers the usefulness of such an audit in preparing an industry for predicted change. This…

  1. FCJ-172 Posthumanism, Technogenesis, and Digital Technologies: A Conversation with N. Katherine Hayles

    Directory of Open Access Journals (Sweden)

    Holger Pötzsch

    2014-12-01

    Full Text Available An interview with N. Katherine Hayles by Holger Pötzsch. Hayles discusses the arc of her work, from her book How We Became Posthuman to her current exploration of nonconscious cognition. She also discusses technogenesis, the digital humanities and digital technologies more generally, and more recent engagements with objects and the sciences, including the work of object oriented ontology and Karen Barad.

  2. A literary approach to tuberculosis: lessons learned from Anton Chekhov, Franz Kafka, and Katherine Mansfield

    Directory of Open Access Journals (Sweden)

    Cristina Vilaplana

    2017-03-01

    Full Text Available Letters by notable writers from the past century can provide valuable information on the times in which they lived. In this article, attention is drawn to the lessons learned from three famous writers who died of tuberculosis: Anton Chekhov, Franz Kafka, and Katherine Mansfield. The characteristics of the course of the disease in the pre-antibiotic era and the importance of addressing mental health in the management of tuberculosis are discussed.

  3. The Art of Defamiliarization in Language in Katherine Mansfield’s Miss Brill

    Institute of Scientific and Technical Information of China (English)

    赵蔚榕

    2015-01-01

    As one of the best short story writers in Britain who ardently loved both music and poetry, Katherine Mansfield managed to add poetic and music beauty to story writing.“Miss Brill”is perfected by her unique writing style. Her poetic and musical lan⁃guage is applied in the story to strengthen the difficulty of understanding, prolong reader’s perception and achieve aesthetic effect.

  4. Earth - Ross Ice Shelf, Antarctica

    Science.gov (United States)

    1991-01-01

    This color picture of Antarctica is one part of a mosaic of pictures covering the entire Antarctic continent taken during the hours following Galileo's historic first encounter with its home planet. The view shows the Ross Ice Shelf. An occasional mountain can be seen poking through the ice. It is late spring in Antarctica, so the sun never sets on the frigid, icy continent. This picture was taken on December 8, 1990.

  5. El género de la intimidad: Katherine Mansfield y Clarice Lispector Writing, intimacy and gender: Katherine Mansfield & Clarice Lispector

    Directory of Open Access Journals (Sweden)

    Alejandra Josiowicz

    2010-06-01

    Full Text Available El artículo analiza problemas teóricos y críticos en relación a la escritura de la intimidad en los Diarios de Katherine Mansfield y en las crónicas del Jornal do Brasil de Clarice Lispector. En primer lugar, aborda la relación entre género literario y género sexual y entre feminismo y autobiografía. En segundo lugar, analiza la constitución de la voz en los géneros íntimos y problematiza la idea de intimidad tomando como punto de partida la teoría psicoanalítica. Luego, propone el análisis comparativo de ambas escritoras en torno a la idea de literatura periférica y a la de relación entre obra literaria e intimidad exhibida. Finalmente, se pregunta por el rol de la imagen de mujer y la comunidad femenina en su textualidad.The article deals with some of the theoretical problems of the writings of intimacy in the Journals of Katherine Mansfield and in chronicles written by Clarice Lispector in the Jornal do Brasil. Firstly, it examines the connections between literary genre and gender and between feminism and autobiography. Secondly, it considers the emergence of the self in the genres of intimacy and contends with the idea of the intimacy by making use of psychoanalytic theories. Subsequently, it analyzes both writers comparatively by considering the concept of the literature of the periphery. It also examines the bond between literary oeuvre and the intimacy exhibited in them. Finally, it judges the images of womanhood and of the feminine community in their intimate writings.

  6. On the Tragedy of Miss Brill in Katherine Mansfield's Miss Brill From the Perspective of Contrast

    Institute of Scientific and Technical Information of China (English)

    Xu Xiaojuan

    2016-01-01

    Miss Brill is a well-known short story of the English writer Katherine Mansfield who is adept in the description of one's interior monologue and analyzing the mental world of human being. Through contrasts between Miss Brill's recalls of her past and the present world, between her good mood from the very beginning to the very end and bad mood in the end, and between the aging Miss Brill and the young lovers, this paper shows the loneliness, disillusionment and tragedy of Miss Brill.

  7. A literary approach to tuberculosis: lessons learned from Anton Chekhov, Franz Kafka, and Katherine Mansfield.

    Science.gov (United States)

    Vilaplana, Cristina

    2017-03-01

    Letters by notable writers from the past century can provide valuable information on the times in which they lived. In this article, attention is drawn to the lessons learned from three famous writers who died of tuberculosis: Anton Chekhov, Franz Kafka, and Katherine Mansfield. The characteristics of the course of the disease in the pre-antibiotic era and the importance of addressing mental health in the management of tuberculosis are discussed. Copyright © 2016 The Author. Published by Elsevier Ltd.. All rights reserved.

  8. Gastrointestinal nematode community of spiny mice (Acomys dimidiatus) from St. Katherine, South Sinai, Egypt.

    Science.gov (United States)

    Soliman, Maha F M; Ibrahim, Mohamed M; Zalat, Samy M

    2015-12-01

    The objective of this work was to study gastrointestinal nematode community infecting Acomys dimidiatus in different wadis of St. Katherine, South Sinai, Egypt. Fieldwork was conducted in three Wadis over a 4 weeks period during April-May, 2003 in St. Katherine, South Sinai, Egypt. Faecal samples from 47 spiny mice were analysed for gastrointestinal nematode community. The nematodes community consisted of four genera Dentostomella spp., Syphacia spp., Aspicularis spp. and Spirurids species. The overall prevalence of infection was 55.3 %. A significant difference in prevalence was found per wadis. Wadi Toffaha showed the highest diversity when compared to other Wadis. Mean species richness was higher in Wadi Tlah (0.87) when compared to other Wadis. Syphacia spp. was frequently found coexisting with other nematodes. A significant interaction was found between both site and co-infection for Aspicularis spp. The spatial stability of nematode community was discussed compared to other related studies. In terms of similarity, the nematode community from Wadi Toffaha was closest to Wadi Tlah. In conclusion, this study showed that there is spatial variation in the distribution of nematode community. Possible factors affecting the stability of parasite community were discussed and further studies are needed.

  9. On Having Faith in the MDGs: A Response to Katherine Marshall (abstract

    Directory of Open Access Journals (Sweden)

    Philip Fountain

    2013-02-01

    Full Text Available Katherine Marshall’s thorough and thoughtful critique of my chapter raises a number of important objections. However, it appears that among her most important criticisms is that I didn’t write a different chapter. To clarify, my chapter was not a general survey of the literature on ‘religion and development’ (which has already been admirably carried out by Jones and Peterson, whom I cited. It was also not an attempt to present a systematic analysis of Marshall’s substantial corpus and its evolution over time. Nor, indeed, was it intended to be a comprehensive and detailed proposal as to where to go from here. These are all useful and valuable tasks – some are arguably more pressing than the argument I provided – but none were the goals of the chapter. (…

  10. Monuments to Academic Carelessness: The Self-fulfilling Prophecy of Katherine Frost Bruner.

    Science.gov (United States)

    Rekdal, Ole Bjørn

    2014-09-01

    In 1942, Katherine Frost Bruner published an article titled "Of psychological writing: Being some valedictory remarks on style." It was published in Journal of Abnormal and Social Psychology, the journal for which she served as editorial assistant between 1937 and 1941. Her collection of advice to writing scholars has been widely quoted, including by several editions of The Publication Manual of the American Psychological Association. The most frequently quoted message in Bruner's article deals with the importance of making sure that references in academic texts are complete and accurate. Exploring the citation history of this particular message reveals an ironic point: the great majority of those who have quoted Bruner's words on reference accuracy have not done so accurately. The case may serve as a reminder of the importance of the basic academic principle of striving to use primary sources. The most startling finding in this study is how frequently this principle is violated, even by authors who advise and educate academic writers.

  11. Bathymetry--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the bathymetry and shaded-relief maps of the Offshore of Fort Ross map area, California. Raster data file is included in...

  12. Contours--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the bathymetric contours for several seafloor maps of the Offshore of Fort Ross map area, California. The vector data file is...

  13. Sir Donald Ross, pioneer aortic valve surgeon.

    Science.gov (United States)

    Wheatley, David

    2015-06-01

    Tribute to Sir Donald Ross by David Wheatley, as read by Robert Kleinloog, President, Society of Cardiothoracic Surgeons of South Africa at the Annual Congress of the South African Heart Association 19 October 2014.

  14. Bathymetry--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the bathymetry and shaded-relief maps of the Offshore of Fort Ross map area, California. Raster data file is included in...

  15. Habitat--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the habitat map of the seafloor of the Offshore of Fort Ross map area, California. The polygon shapefile is included in...

  16. Contours--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the bathymetric contours for several seafloor maps of the Offshore of Fort Ross map area, California. The vector data file is...

  17. The South Pole and the Ross Sea

    Science.gov (United States)

    2002-01-01

    This image shows a rare clear view of the South Pole (lower right) and the Ross Sea, Antarctica. The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) acquired the scene on December 26, 2001. The geographic South Pole is located in the center of Antarctica, at an altitude of 2,900 meters (9,300 feet). It rests on a continent-wide ice sheet that is 2,870 m thick, with the underlying bedrock only 30 m (98 feet) above sea level. The ice underlying the South Pole is as much as 140,000 years old, and is currently accumulating at about 82 cm (32 inches) per year. Roughly 2,500 km (1,550 miles) away is the green water of the Ross Sea, which indicates the presence of large numbers of phytoplankton. This is a highly productive part of the world's oceans. Also note the ice gathered around McMurdo Sound, seen toward the lefthand shoreline of the Ross Sea, at the edge of the Ross Ice Shelf. According to National Science Foundation researchers, this ice is making it difficult for penguins to reach their food supply. Separating the continental Antarctic ice sheet from the Ross Sea are the Queen Maud Mountains and the Ross Ice Shelf. Image courtesy the SeaWiFS Project, NASA/Goddard Space Flight Center, and ORBIMAGE

  18. X-Ray Spectroscopy, The Ellen Richards Prize, and Nuclear Proliferation: The Inspiring Life of Katherine Chamberlain

    Science.gov (United States)

    Geramita, Matthew

    2008-04-01

    In 1924, Katherine Chamberlain became the first woman to receive a doctorate in physics from the University of Michigan. As one of the first women in the world to earn a doctorate in physics, Katherine reached a level prominence in the scientific community that few women had achieved. As a scientist, Katherine studied the outer energy levels of various elements using x-ray spectroscopy at the University of Michigan. In her thesis, she showed the potential for x-rays to reduce highly oxidized compounds and in 1925 won the Ellen Richards Prize for the world's best scientific paper by a woman. As an educator, she taught an introduction to photography course for thirty-five years in the hopes of creating new ways to inspire a love for physics in her students. As a community leader, she worked with The United World Federalists and The Michigan Memorial Phoenix Project to find peaceful uses for nuclear energy. Looking at these aspects of Chamberlain's life offers a unique perspective on the physics community of the 1920's, physics education, and the nuclear panic that followed WWII.

  19. STS-110 Crew Interview: Jerry Ross

    Science.gov (United States)

    2002-01-01

    STS-110 Mission Specialist Jerry Ross is seen during this preflight interview, where he gives a quick overview of the mission before answering questions about his inspiration to become an astronaut and his career path. Ross outlines his role in the mission in general, and specifically during the docking and extravehicular activities (EVAs). He describes the payload (S0 Truss and Mobile Transporter) and the dry run installation of the S0 truss that will take place the day before the EVA for the actual installation. Ross discusses the planned EVAs in detail and outlines what supplies will be left for the resident crew of the International Space Station (ISS). He ends with his thoughts on the most valuable aspect of the ISS.

  20. Seafloor character--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents the seafloor-character map Offshore of Fort Ross, California (raster data file is included in "SeafloorCharacter_OffshoreFortRoss.zip,"...

  1. Seafloor character--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents the seafloor-character map Offshore of Fort Ross, California (raster data file is included in "SeafloorCharacter_OffshoreFortRoss.zip,"...

  2. Unlatching the Gate – Helping Adult Students Learn Mathematics by Katherine Safford-Ramus, (2008

    Directory of Open Access Journals (Sweden)

    Armin Hollenstein

    2010-08-01

    Full Text Available Katherine Safford-Ramus is an associate professor of mathematics at Saint Peter’s College, a Jesuit College in New Jersey, USA. She has been teaching introductory mathematics courses at the tertiary level for 24 years at a community college. This book is based on her doctoral thesis. In Chapter 1, Unlatching the Gate deliberates a rich specra of conditions for, and peculiarities of, mathematics learning by adults in a formal environment. Influential theories and empirical findings in the fields of educational psychology, adult education and mathematics education are surveyed with a focus on adult learners and – of course –teachers and institutions. The text does not discuss empirical research undertaken by the author; it examines her broad personal teaching experience in the light of the above-mentioned body of knowledge and proposes directions for the development of adult mathematics education. In this sense, Unlatching the Gate is a theoretical book reflecting on practical issues. The target audience would be adult educators and students of post secondary mathematics education.

  3. Healing in forgiveness: A discussion with Amanda Lindhout and Katherine Porterfield, PhD

    Directory of Open Access Journals (Sweden)

    Katherine A. Porterfield

    2014-09-01

    Full Text Available In 2008, Amanda Lindhout was kidnapped by a group of extremists while traveling as a freelance journalist in Somalia. She and a colleague were held captive for more than 15 months, released only after their families paid a ransom. In this interview, Amanda discusses her experiences in captivity and her ongoing recovery from this experience with Katherine Porterfield, Ph.D. a clinical psychologist at the Bellevue/NYU Program for Survivors of Torture. Specifically, Amanda describes the childhood experiences that shaped her thirst for travel and knowledge, the conditions of her kidnapping, and her experiences after she was released from captivity. Amanda outlines the techniques that she employed to survive in the early aftermath of her capture, and how these coping strategies changed as her captivity lengthened. She reflects on her transition home, her recovery process, and her experiences with mental health professionals. Amanda's insights provide an example of resilience in the face of severe, extended trauma to researchers, clinicians, and survivors alike. The article ends with an discussion of the ways that Amanda's coping strategies and recovery process are consistent with existing resilience literature. Amanda's experiences as a hostage, her astonishing struggle for physical and mental survival, and her life after being freed are documented in her book, co-authored with Sara Corbett, A House in the Sky.

  4. 36 CFR 7.69 - Ross Lake National Recreation Area.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 1 2010-07-01 2010-07-01 false Ross Lake National Recreation... INTERIOR SPECIAL REGULATIONS, AREAS OF THE NATIONAL PARK SYSTEM § 7.69 Ross Lake National Recreation Area... snowmobiles the following locations within the Ross Lake National Recreation Area: (1) State Highway 20,...

  5. Intestinal helminths of spiny mice (Acomys cahirinus dimidiatus) from St Katherine's Protectorate in the Sinai, Egypt.

    Science.gov (United States)

    Behnke, J M; Barnard, C J; Mason, N; Harris, P D; Sherif, N E; Zalat, S; Gilbert, F S

    2000-03-01

    Spiny mice, Acomys cahirinus dimidiatus, inhabiting the wadis close to St Katherine in the mountains of the Sinai peninsula, were trapped and their helminth parasites were studied. Sixty one mice provided faeces for analysis and 27 were killed and autopsied. Six species of helminths were recorded (the spirurid nematodes, Protospirura muricola (74.1%) and Mastophorus muris (11.1%), the oxyuroid nematodes, Dentostomella kuntzi (59.3%), Aspiculuris africana (3.7%), and Syphacia minuta (3.7%) and the hymenolepidid cestode Rodentolepis negevi (18.5%)). The spirurids were the dominant species present, accounting for up to 0.87% of total host body weight. Analysis of worm weights and lengths suggested that transmission had been taking place in the months preceding our study. No sex difference in the prevalence or abundance of spirurids was detected. Significant differences were identified in the abundance of total nematode burdens and the mean helminth species richness between the three wadis which provided multiple captures of mice. There was also a marked effect of host age on both parameters. A highly significant positive correlation between spirurid egg counts and total worm biomass indicated that non-invasive techniques based on egg counts could be used to quantify worm burdens and when this technique was applied to a larger sample size (n = 61), a significant difference between sites but no host sex or age effects were detected for spirurid faecal egg counts. The data suggest that there are differences between helminth component communities infecting spiny mice in different neighbouring wadis, a hypothesis which will be explored further through our continuing studies in the Sinai.

  6. STS-88 Crew Interview: Jerry Ross

    Science.gov (United States)

    1998-01-01

    Jerry Ross discusses the seven-day mission that will be highlighted by the mating of the U.S.-built Node 1 station element to the Functional Energy Block (FGB) which will already be in orbit, and two spacewalks to connect power and data transmission cables between the Node and the FGB. Node 1 will be the first Space Station hardware delivered by the Space Shuttle. He also disscusses the assembly sequence. The crew will conduct a series of rendezvous maneuvers similar to those conducted on other Shuttle missions to reach the orbiting FGB. Once the two elements are docked, Ross and Newman will conduct two scheduled spacewalks to connect power and data cables between the Node, PMAs and the FGB. The day following the spacewalks, Endeavour will undock from the two components, completing the first Space Station assembly mission.

  7. Deux lectures critiques d'Alf Ross

    OpenAIRE

    Millard, Eric

    2000-01-01

    Suivi de deux textes de Kelsen (Une théorie réaliste et la Théorie pure du droit ; notice HAL : http://halshs.archives-ouvertes.fr/halshs-00126308) et Hart (Sur le réalisme scandinave ; notice HAL : http://halshs.archives-ouvertes.fr/halshs-00126310); Présentation de deux textes d'Hans Kelsen et d'HLA Hart critiquant l'ouvrage On law and Justice de Ross

  8. Ross Ice Shelf, Antarctic Ice and Clouds

    Science.gov (United States)

    1991-01-01

    In this view of Antarctic ice and clouds, (56.5S, 152.0W), the Ross Ice Shelf of Antarctica is almost totally clear, showing stress cracks in the ice surface caused by wind and tidal drift. Clouds on the eastern edge of the picture are associated with an Antarctic cyclone. Winds stirred up these storms have been known to reach hurricane force.

  9. Phenolic compounds in Ross Sea water

    Science.gov (United States)

    Zangrando, Roberta; Barbaro, Elena; Gambaro, Andrea; Barbante, Carlo; Corami, Fabiana; Kehrwald, Natalie; Capodaglio, Gabriele

    2016-04-01

    Phenolic compounds are semi-volatile organic compounds produced during biomass burning and lignin degradation in water. In atmospheric and paleoclimatic ice cores studies, these compounds are used as biomarkers of wood combustion and supply information on the type of combusted biomass. Phenolic compounds are therefore indicators of paleoclimatic interest. Recent studies of Antarctic aerosols highlighted that phenolic compounds in Antarctica are not exclusively attributable to biomass burning but also derive from marine sources. In order to study the marine contribution to aerosols we developed an analytical method to determine the concentration of vanillic acid, vanillin, p-coumaric acid, syringic acid, isovanillic acid, homovanillic acid, syringaldehyde, acetosyringone and acetovanillone present in dissolved and particle phases in Sea Ross waters using HPLC-MS/MS. The analytical method was validated and used to quantify phenolic compounds in 28 sea water samples collected during a 2012 Ross Sea R/V cruise. The observed compounds were vanillic acid, vanillin, acetovanillone and p-coumaric acid with concentrations in the ng/L range. Higher concentrations of analytes were present in the dissolved phase than in the particle phase. Sample concentrations were greatest in the coastal, surficial and less saline Ross Sea waters near Victoria Land.

  10. Algunas notas sobre la proyección literaria en el epistolario de Pedro Salinas a Katherine Whitmore

    Directory of Open Access Journals (Sweden)

    Peragón López, Clara Eugenia

    2004-12-01

    Full Text Available Pedro Salinas' lover with no name that appears in his trilogy in loving poetry (La voz a ti debida. Razón de amor, Largo lament is presented with her own name in the group of letters sent by the poet to Katherine Whitmore. Through the analysis of these fascinating texts we will be able to establish tight relationship between his real world and his poetic world. Their content will reveal us a double documental and literary aspect of one of the best poems of love of the XX century.La amada innombrada en la trilogía de poesía amorosa de Pedro Salinas (La voz a ti debida. Razón de amor, Largo lamento se presenta con nombre propio en el conjunto de cartas enviadas por el poeta a Katherine Whitmore. A través del análisis de este fascinante epistolario podremos establecer una estrecha relación entre el mundo real y el mundo poético saliniano. Su contenido nos revelará un doble aspecto documental y literario y nos acercará a uno de los mejores poemarios de temática amorosa del siglo XX.

  11. Katherine Philips, Aphra Behn, and Sylvia Plath: “a passionate journey” towards “a revolution in female manners”

    Directory of Open Access Journals (Sweden)

    Giada Cacciavilni

    2010-06-01

    Full Text Available Katherine Philips, Aphra Behn, and Sylvia Plath were artists who struggled during their lives to express their thoughts and ideas. In addition to this, being women, they found it hard to be recognised as writers and their fight against social conventions and norms is now considered of huge importance since they managed to open doors for women that came after them. Katherine Philips started a feminine revolution which was taken over by Aphra Behn, and by Sylvia Plath about three centuries later. The three authors rebelled against the feminine mystique of their time and the subsequent domestification of women. In addition to this, they refused to be men’s shadows and raised a new awareness of women as active subjects that could finally use their voices to express themselves. The aim of this essay is to explore and interpret the ways in which these three women managed to subvert the prescribed role that society had in store for them by touching on different topics related to gender and the relationship between men and women. I will focus on their outlook on marriage and on women’s roles in society.

  12. Ross to the Rescue! Rutgers' Ross Todd's Quest to Renew School Libraries

    Science.gov (United States)

    Kenney, Brian

    2006-01-01

    This article presents an interview with Ross Todd, director of research at Rutgers University's Center for International Scholarship in School Libraries. Todd talks about the impact of the Ohio study, based on student's evaluation of their media centers, and his quest to renew school libraries. He stresses that part of the renewal and continuous…

  13. Elisabeth Kubler-Ross as a Religious Leader.

    Science.gov (United States)

    Klass, Dennis; Hutch, Richard A.

    1986-01-01

    Considers Elisabeth Kubler-Ross as a charismatic religious leader and examines the feminine quality of her message and leadership style. An examination of the prospects for an enduring cultural innovation based on Kubler-Ross's work concludes that her leadership does not conform to conditions necessary for institutionalization of her charismatic…

  14. Elisabeth Kubler-Ross as a Religious Leader.

    Science.gov (United States)

    Klass, Dennis; Hutch, Richard A.

    1986-01-01

    Considers Elisabeth Kubler-Ross as a charismatic religious leader and examines the feminine quality of her message and leadership style. An examination of the prospects for an enduring cultural innovation based on Kubler-Ross's work concludes that her leadership does not conform to conditions necessary for institutionalization of her charismatic…

  15. The Paediatric Cardiology Hall of Fame – Donald Nixon Ross.

    Science.gov (United States)

    Somerville, Jane

    2015-10-01

    Donald Nixon Ross, FRCS (4 October 1922 to 7 July 2014) was a South African-born British cardiothoracic surgeon, who developed the pulmonary autograft, known as the Ross procedure, for the treatment of aortic valve disease, and also performed the first heart transplant in the United Kingdom in 1968. This paper, written by Jane Somerville, Professor of Cardiology [Retired], Imperial College London, London, United Kingdom, provides the personal recollections about Donald Ross from Jane Somerville, and thus provides a unique snapshot of cardiac surgical history.

  16. Minevikupärandit Häädemeestelt / Eevi Ross

    Index Scriptorium Estoniae

    Ross, Eevi, 1938-

    2012-01-01

    Raamatututvustus: Minevikupärandit Häädemeestelt : valimik korrespondentide murdetekste. VIII / Eesti Teaduste Akadeemia Emakeele Selts ; kogunud Marta Mäesalu ; koostanud ja toimetanud: Helju Kaal, Eevi Ross. Tallinn : Emakeele Selts, 2012

  17. Minevikupärandit Häädemeestelt / Eevi Ross

    Index Scriptorium Estoniae

    Ross, Eevi, 1938-

    2012-01-01

    Raamatututvustus: Minevikupärandit Häädemeestelt : valimik korrespondentide murdetekste. VIII / Eesti Teaduste Akadeemia Emakeele Selts ; kogunud Marta Mäesalu ; koostanud ja toimetanud: Helju Kaal, Eevi Ross. Tallinn : Emakeele Selts, 2012

  18. Folds--Offshore of Fort Ross Map Area, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for folds for the geologic and geomorphic map of the Offshore of Fort Ross map area, California. The vector data file is included...

  19. Faults--Offshore of Fort Ross Map Area, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for faults for the geologic and geomorphic map of the Offshore of Fort Ross map area, California. The vector data file is included...

  20. Backscatter A [8101]--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of Fort Ross map area, California. Backscatter data are provided as separate grids...

  1. ROSS Skills, Knowledge, and Abilities Training Evaluation. Gaps and Recommendations

    Energy Technology Data Exchange (ETDEWEB)

    Ala, Maureen [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Gruidl, Jeremiah [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Buddemeier, Brooke [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2015-09-30

    This document describes the development of the ROSS SKAs, the cross-mapping of the SKAs to the available training, identifies gaps in the SKA and training, and provides recommendations to address those gaps.

  2. Backscatter B [7125]--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of Fort Ross map area, California. Backscatter data are provided as separate grids...

  3. Backscatter C [Swath]--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of Fort Ross map area, California. Backscatter data are provided as separate grids...

  4. The Ross II procedure: pulmonary autograft in the mitral position.

    Science.gov (United States)

    Athanasiou, Thanos; Cherian, Ashok; Ross, Donald

    2004-10-01

    The surgical management of mitral valve disease in women of childbearing age, young patients, and children with congenital mitral valve defects is made difficult by the prospect of lifelong anticoagulation. We suggest the use of a pulmonary autograft in the mitral position (Ross II procedure) as an alternative surgical technique. We present a review of the literature, historical perspectives, indications, selection criteria, and surgical technique for the Ross II procedure. Our literature search identified 14 studies that reported results from the Ross II operation. Performed in 103 patients, the overall in-hospital mortality was 7 (6.7%), with a late mortality of 10 (9%). Although further research is needed, current evidence suggests the Ross II operation is a valuable alternative in low-risk young patients where valve durability and the complication rate from other procedures is unsatisfactory and anticoagulation not ideal.

  5. Backscatter A [8101]--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of Fort Ross map area, California. Backscatter data are provided as separate grids...

  6. Bathymetry Hillshade--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the bathymetry and shaded-relief maps of the Offshore of Fort Ross map area, California. Raster data file is included in...

  7. Backscatter B [7125]--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of Fort Ross map area, California. Backscatter data are provided as separate...

  8. Backscatter C [Swath]--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of Fort Ross map area, California. Backscatter data are provided as separate...

  9. Backscatter A [8101]--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of Fort Ross map area, California. Backscatter data are provided as separate...

  10. Backscatter C [Swath]--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the acoustic-backscatter map of the Offshore of Fort Ross map area, California. Backscatter data are provided as separate grids...

  11. Bathymetry Hillshade--Offshore of Fort Ross, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the bathymetry and shaded-relief maps of the Offshore of Fort Ross map area, California. Raster data file is included in...

  12. Faults--Offshore of Fort Ross Map Area, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for faults for the geologic and geomorphic map of the Offshore of Fort Ross map area, California. The vector data file is included...

  13. Folds--Offshore of Fort Ross Map Area, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for folds for the geologic and geomorphic map of the Offshore of Fort Ross map area, California. The vector data file is included...

  14. ‘The 19th-century construction of the Renaissance’: Katherine Wheeler, Victorian Perceptions of Renaissance Architecture, Farnham England and Burlington, Vermont: Ashgate, 2014

    Directory of Open Access Journals (Sweden)

    Medina Lasansky

    2014-12-01

    Full Text Available Katherine Wheeler’s Victorian Perceptions of Renaissance Architecture provides a study of the architecture profession and the history of Renaissance architecture in nineteenth century England. Establishing a canon of Renaissance architectural history was key to the rise of architectural professionalism as well as the education of the architect. As we discover, the study of the Renaissance influenced design in England on all scales while also influencing the design of the architect himself.

  15. MaRIE 1.0: A briefing to Katherine Richardson-McDaniel, Staff Member for U. S. Senator Martin Heinrich (D-NM)

    Energy Technology Data Exchange (ETDEWEB)

    Barnes, Cris William [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2015-02-24

    At the request of Katherine Richardson-McDaniel, Staff Member to U.S. Senator Martin Heinrich (D-NM), a high-level briefing was requested about MaRIE 1.0, the Matter-Radiation Interactions in Extremes effort at Los Alamos National Laboratory. What it would be, the mission need motivation, the scientific challenge, and the current favorable impact on both programs and people are shown in viewgraph form.

  16. Western Ross Sea continental slope gravity currents

    Science.gov (United States)

    Gordon, Arnold L.; Orsi, Alejandro H.; Muench, Robin; Huber, Bruce A.; Zambianchi, Enrico; Visbeck, Martin

    2009-06-01

    Antarctic Bottom Water of the world ocean is derived from dense Shelf Water that is carried downslope by gravity currents at specific sites along the Antarctic margins. Data gathered by the AnSlope and CLIMA programs reveal the presence of energetic gravity currents that are formed over the western continental slope of the Ross Sea when High Salinity Shelf Water exits the shelf through Drygalski Trough. Joides Trough, immediately to the east, offers an additional escape route for less saline Shelf Water, while the Glomar Challenger Trough still farther east is a major pathway for export of the once supercooled low-salinity Ice Shelf Water that forms under the Ross Ice Shelf. The Drygalski Trough gravity currents increase in thickness from ˜100 to ˜400 m on proceeding downslope from ˜600 m (the shelf break) to 1200 m (upper slope) sea floor depth, while turning sharply to the west in response to the Coriolis force during their descent. The mean current pathway trends ˜35° downslope from isobaths. Benthic-layer current and thickness are correlated with the bottom water salinity, which exerts the primary control over the benthic-layer density. A 1-year time series of bottom-water current and hydrographic properties obtained on the slope near the 1000 m isobath indicates episodic pulses of Shelf Water export through Drygalski Trough. These cold (34.75) pulses correlate with strong downslope bottom flow. Extreme examples occurred during austral summer/fall 2003, comprising concentrated High Salinity Shelf Water (-1.9 °C; 34.79) and approaching 1.5 m s -1 at descent angles as large as ˜60° relative to the isobaths. Such events were most common during November-May, consistent with a northward shift in position of the dense Shelf Water during austral summer. The coldest, saltiest bottom water was measured from mid-April to mid-May 2003. The summer/fall export of High Salinity Shelf Water observed in 2004 was less than that seen in 2003. This difference, if real

  17. Climate variability and Ross River virus transmission.

    Science.gov (United States)

    Tong, S; Bi, P; Donald, K; McMichael, A J

    2002-08-01

    (1) To examine the feasibility to link climate data with monthly incidence of Ross River virus (RRv). (2) To assess the impact of climate variability on the RRv transmission. An ecological time series analysis was performed on the data collected between 1985 to 1996 in Queensland, Australia. Information on the notified RRv cases was obtained from the Queensland Department of Health. Climate and population data were supplied by the Australian Bureau of Meteorology and the Australian Bureau of Statistics, respectively. Spearman's rank correlation analyses were performed to examine the relation between climate variability and the monthly incidence of notified RRv infections. The autoregressive integrated moving average (ARIMA) model was used to perform a time series analysis. As maximum and minimum temperatures were highly correlated with each other (r(s)=0.75), two separate models were developed. For the eight major cities in Queensland, the climate-RRv correlation coefficients were in the range of 0.12 to 0.52 for maximum and minimum temperatures, -0.10 to 0.46 for rainfall, and 0.11 to 0.52 for relative humidity and high tide. For the whole State, rainfall (partial regression coefficient: 0.017 (95% confidence intervals 0.009 to 0.025) in Model I and 0.018 (0.010 to 0.026) in Model II), and high tidal level (0.030 (0.006 to 0.054) in Model I and 0.029 (0.005 to 0.053) in Model II) seemed to have played significant parts in the transmission of RRv in Queensland. Maximum temperature was also marginally significantly associated with the incidence of RRv infection. Rainfall, temperature, and tidal levels may be important environmental determinants in the transmission cycles of RRv disease.

  18. Radiological Operations Support Specialist (ROSS) Pilot Course Summary and Recommendations

    Energy Technology Data Exchange (ETDEWEB)

    Alai, M. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Askin, A. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Buddemeier, B. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Wogan, L. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Doshi, P. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Tai, L. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2016-09-30

    In support of the Department of Homeland Security / Science and Technology Directorate’s (DHS/S&T) creation of a new position called the Radiological Operations Support Specialist (ROSS), Lawrence Livermore National Laboratory (LLNL) in Sub-task 1.1 and 1.2 has assisted in the development of the ROSS skills, knowledge, and abilities (SKAs); identified potentially relevant training; cross-mapped the training to the SKAs; and identified gaps in the training related to the SKAs, as well as their respective level of training knowledge - current versus desired. In the follow on task, Sub-task 1.3, a 5 day ROSS Pilot Training course was developed to fill the priority gaps identified in Sub-Task 1.2. Additionally, in Sub-Task 1.5, LLNL has performed a gap analysis of electronic tools, handbooks, and job-aides currently available to the ROSS and developed recommendations for additional and next generation tools to ensure the operational effectiveness of the ROSS position. This document summarizes the feedback received from the instructors and pilot course observers on what worked in the course and what could be improved as well as an assessment of the Pre- and Post-Test administered to the students.

  19. A composite semiresorbable armoured scaffold stabilizes pulmonary autograft after the Ross operation: Mr Ross's dream fulfilled.

    Science.gov (United States)

    Nappi, Francesco; Spadaccio, Cristiano; Fraldi, Massimiliano; Montagnani, Stefania; Fouret, Pierre; Chachques, Juan Carlos; Acar, Christophe

    2016-01-01

    Use of resorbable external reinforcement of the pulmonary autograft during the Ross operation has been suggested, but the differential regional potential for dilation of the aorta, mainly regarding the neo-root and the neo-Valsalva sinuses, represents an unresolved issue. Auxetic materials could be useful in preventing dilation given their favorable mechanical properties. We designed a composite semiresorbable armoured bioprosthesis constituted by polydioxanone and expanded polytetrafluoroethylene and evaluated its effectiveness as a pulmonary autograft reinforcement device in an animal model of the Ross procedure. An experimental model of the Ross procedure was performed in 20 three-month-old growing lambs. The pulmonary autograft was alternatively nonreinforced (control group n = 10) or reinforced with composite bioprosthesis (reinforced group n = 10). Animals were followed up during growth for 6 months by angiography and echocardiography. Specific stainings for extracellular matrix and immunohistochemistry for metalloproteinase-9 were performed. Reference aortic diameter increased from 14 ± 1 mm to 19 ± 2 mm over 6 months of growth. In the control group, pulmonary autograft distension (28 ± 2 mm) was immediately noted, followed by aneurysm development at 6 months (40 ± 2 mm, P < .001 vs reference). In the reinforced group, an initial dilation to 18 ± 1 mm was detected and the final diameter was 27 ± 2 mm (42% increase). Two deaths due to pulmonary autograft rupture occurred in the control group. On histology, the control group showed medial disruption with connective fibrous replacement, whereas in the reinforced group compensatory intimal hyperplasia was present in the absence of intimal tears. The bioprosthesis promoted a positive matrix rearrangement process favoring neoarterialization and elastic remodeling as demonstrated on specific staining for elastin collagen and metalloproteinase-9. The device adapted and functionally compensated for the

  20. 凯瑟琳·曼斯菲尔德短篇小说的艺术特色%THE ART OF KATHERINE MANSFIELD'S SHORT-STORIES

    Institute of Scientific and Technical Information of China (English)

    祁艳红

    1999-01-01

    @@ Katherine Mansfield is "one of the best-known writers with original writing style in the English literature of the 20th century".She is also one of representative figures in the second development period of western short -stories. Her works have a minute style, rich in poetic flavor. Character's psychology is portrayed to the life. They are a milestone in the history of English short stories entering into modern mature period. The essay aims to explore some of Mansfield's major artistic devices.

  1. Human radiation studies: Remembering the early years: Oral history of medical physicist Katherine L. Lathrop and physician Paul V. Harper, conducted January 26, 1995

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-09-01

    This report provides a transcript of an interview with Ms. Katherine L. Lathrop and Dr. Paul V. Hopper by representatives of the DOE Office of Human Radiation Research. Ms. Lathrop and Dr. Hopper were chosen for this interview because of their long-standing interest and research experience in the development of nuclear medicine. After brief biographical sketches the researchers provide a broad and interesting description of their roles in the initial uses of many radiopharmaceuticals, their experiences in human experimentation, and interactions with many other pioneers in nuclear medicine.

  2. 76 FR 22338 - Proposed Fort Ross-Seaview Viticultural Area; Comment Period Reopening

    Science.gov (United States)

    2011-04-21

    ... Alcohol and Tobacco Tax and Trade Bureau 27 CFR Part 9 RIN 1513-AB44 Proposed Fort Ross-Seaview... the Fort Ross-Seaview viticultural area in western Sonoma County, California. Through this notice, TTB is soliciting comments on the establishment of the Fort Ross-Seaview viticultural area as proposed...

  3. 77 FR 56859 - Federal Register Notification of Redesignation of Potential Wilderness as Wilderness, Ross Lake...

    Science.gov (United States)

    2012-09-14

    ..., Ross Lake National Recreation Area, North Cascades National Park Service Complex, Washington AGENCY... acres of North Cascades National Park, Ross Lake National Recreation Area, and Lake Chelan National... also designated an additional 5,226 acres of potential wilderness within Ross Lake National...

  4. Ross Ice Shelf and the Queen Maude Mounains, Antarctica

    Science.gov (United States)

    1991-01-01

    Part of the Ross Ice Shelf and the Queen Maude Mounains of Antarctica (55.5N, 178.0W) are in the background of this scene, oriented toward the south. Low stratocumulus clouds are predominant throughout most of the scene.

  5. Abundances in the metal poor dwarf Ross 451

    Science.gov (United States)

    Spiesman, William J.

    1990-01-01

    High dispersion echelle spectra of the high velocity subdwarf Ross 451 (= G236-080) were obtained using the 4-m telescope at Kitt Peak. Initial abundance determinations for six elements are presented, using absolute oscillator strengths and metal-poor stellar-atmosphere models.

  6. A time inhomogeneous Cox-Ingersoll-Ross diffusion with jumps

    CERN Document Server

    Hoepfner, Reinhard

    2009-01-01

    We consider a time inhomogeneous Cox-Ingersoll-Ross diffusion with positive jumps. We exploit a branching property to prove existence of a unique strong solution under a restrictive condition on the jump measure. We give Laplace transforms for the transition probabilities, with an interpretation in terms of limits of mixtures over Gamma laws.

  7. Isad ja tütred, isad ja pojad / Jüri Ross, Kristine Ross, Fjodor Berman ...[jt.] ; üles kirjutanud Jaana Liigand

    Index Scriptorium Estoniae

    2011-01-01

    Büroomaailma juht Jüri Ross ja turundusdirektor Kristine Ross, BLRT Grupi omanik Fjodor Berman ja BLRT Grupi tütarfirma Refonda tegevdirektor Mark Berman, Saaremaa Laevakompanii ja paljude firmade omanik Vjatšeslav Leedo ja Mosaiigi kohviku omanik Katrin Leedo ärist, juhtimisest ja omavahelistest suhetest

  8. Isad ja tütred, isad ja pojad / Jüri Ross, Kristine Ross, Fjodor Berman ...[jt.] ; üles kirjutanud Jaana Liigand

    Index Scriptorium Estoniae

    2011-01-01

    Büroomaailma juht Jüri Ross ja turundusdirektor Kristine Ross, BLRT Grupi omanik Fjodor Berman ja BLRT Grupi tütarfirma Refonda tegevdirektor Mark Berman, Saaremaa Laevakompanii ja paljude firmade omanik Vjatšeslav Leedo ja Mosaiigi kohviku omanik Katrin Leedo ärist, juhtimisest ja omavahelistest suhetest

  9. 凯瑟琳·曼斯菲尔德和《已故上校的女儿》%Katherine Mansfield And The Danghters of the Late Colonel

    Institute of Scientific and Technical Information of China (English)

    蒋萍

    2001-01-01

    This paper can be devided into two parts . The first part gives a brief introduction toKatherine Mansficld, her life, her thoughts and her contribution to the development of modern English short stories. The second part shows her writing techniques with one of her successful stories, The Daughters of the Late Colonel

  10. ROSS: An Object-Oriented Language for Constructing Simulations.

    Science.gov (United States)

    1984-12-01

    W. Giarla, S. Narain, E. Cesar , and S. Turner, R-3158-AF, October 1984. Fast Concurrent Simulation Using the Time Warp Mechanism, Part I: Local Contru... Villanueva , and H. M. Markowitz, The Simscript H Pmoramming Language, Prentice-Hall, Englewood Cliffs, New Jersey, 1968. Klahr, P., J. Ellis, W. Giarla, S...Narain, E. Cesar , and S. Turner, TWIRL Tactical Warfare in the ROSS Lanuage, The Rand Corporation, R.3158-AF, October 1984. Klahr, P., and W. S

  11. Ross sea ice motion, area flux, and deformation

    Science.gov (United States)

    kwok, Ron

    2005-01-01

    The sea ice motion, area export, and deformation of the Ross Sea ice cover are examined with satellite passive microwave and RADARSAT observations. The record of high-resolution synthetic aperture radar (SAR) data, from 1998 and 2000, allows the estimation of the variability of ice deformation at the small scale (10 km) and to assess the quality of the longer record of passive microwave ice motion. Daily and subdaily deformation fields and RADARSAT imagery highlight the variability of motion and deformation in the Ross Sea. With the passive microwave ice motion, the area export at a flux gate positioned between Cape Adare and Land Bay is estimated. Between 1992 and 2003, a positive trend can be seen in the winter (March-November) ice area flux that has a mean of 990 x 103 km2 and ranges from a low of 600 x 103 km2 in 1992 to a peak of 1600 x 103 km2 in 2001. In the mean, the southern Ross Sea produces almost twice its own area of sea ice during the winter. Cross-gate sea level pressure (SLP) gradients explain 60% of the variance in the ice area flux. A positive trend in this gradient, from reanalysis products, suggests a 'spinup' of the Ross Sea Gyre over the past 12 yr. In both the NCEP-NCAR and ERA-40 surface pressure fields, longer-term trends in this gradient and mean SLP between 1979 and 2002 are explored along with positive anomalies in the monthly cross-gate SLP gradient associated with the positive phase of the Southern Hemisphere annular mode and the extrapolar Southern Oscillation.

  12. Note On The Ross Sea Shelf Water Downflow Processes (antarctica)

    Science.gov (United States)

    Bergamasco, A.; Defendi, V.; Spezie, G.; Budillon, G.; Carniel, S.

    In the framework of the CLIMA Project of the Italian National Program for Research in Antarctica, three different experimental data sets were acquired along the continental shelf break; two of them (in 1997 and 2001) close to Cape Adare, the 1998 one in the middle of the Ross Sea (i.e. 75 S, 177 W). The investigations were chosen in order to explore the downslope flow of the bottom waters produced in the Ross Sea, namely the High Salinity Shelf Water (HSSW, the densest water mass of the southern ocean coming from its formation site in the polynya region in Terra Nova bay), and the Ice Shelf Water (ISW, originated below the Ross Ice Shelf and outflowing northward). Both bottom waters spill over the shelf edge and mix with the Circumpolar Deep Water (CDW) contributing to the formation of the Antarctic Bottom Waters (AABW). Interpreting temperature, salinity and density maps in terms of cascading processes, both HSSW and ISW overflows are evidenced during, respectively, 1997 and 1998. During the 2001 acquisition there is no presence of HSSW along the shelf break, nevertheless distribution captures the evidence of a downslope flow process.

  13. “A Refusal of Strict Patterns of Interpretation”: Metaphor, Narrative, and Literary Connections in Katherine Mansfield’s “The Fly”

    Directory of Open Access Journals (Sweden)

    Elena Glotova

    2014-08-01

    Full Text Available This paper explores how narrative and metaphor combine to articulate the moral and ideological message in a short story “The Fly” by Katherine Mansfield. The research addresses some of the most popular interpretations of the story that demonstrate its ambiguity and intertextual connections. The story metaphorical language is compared with the metaphorical patterns that account for symbolism in a related short story “Small Fry” by Anton Chekhov. The paper argues that cognitive stylistic approach to narrative study can provide the necessary tools to explain the patterns of imagery that produce the story ambiguity. Personification as an important ontological metaphor generates patterns that rationalize the formation of symbolic individuality in existence.

  14. Amphibian Seismological Studies in the Ross Sea, Antarctica

    Science.gov (United States)

    Schmidt-Aursch, Mechita; Kuk Hong, Jong; Lee, Won Sang; Geissler, Wolfram; Yun, Sukyoung; Gohl, Karsten; Park, Yongcheol; Yoo, Hyun Jae

    2016-04-01

    The Antarctic Ross Sea is one of the key regions for polar research activities. Research stations from several countries located at the coast are the base for inland expeditions. Even in the austral summer, the Ross Sea is party covered with drifting ice fields; this requires an icebreaker for all marine explorations. Therefore, large geophysical surveys in the Ross Sea are difficult. But the area is of special interest for seismologists: The Terror Rift in the western Ross Sea is a prominent neotectonic structure of the West Antarctic Rift System (WARS). It is located near the coast in the Victoria Land Basin and extends parallel to the Transantarctic Mountains. The rifting processes and the accompanying active onshore volcanism lead to increased seismicity in the region. The annual waxing and waning of the sea-ice and the dynamics of the large Ross Ice Shelf and nearby glaciers generate additional seismic signals. Investigation on seismological activities associated with the WARS and the cryogenic signals simultaneously would give us an unprecedented opportunity to have a better understanding of the Evolution of the WARS (EWARS) and the rapid change in the cryospheric environment nearby. The Korea Polar Research Institute (KOPRI) and the Alfred-Wegener-Institut (AWI) have conducted a pilot study off the Korean Jang Bogo research station in the Terra Nova Bay by developing a collaborative research program (EWARS) since 2011 to explore seismicity and seismic noise in this region. Four broadband ocean-bottom seismometers (OBS) from the German DEPAS pool were deployed in January 2012 with the Korean research icebreaker RV Araon. Three instruments could successfully be recovered after 13 months, the fourth OBS was not accessible due to local sea-ice coverage. We have successfully completed a second recovery operation in January 2014. All stations recorded data of good quality, one station stopped after 8 months due to a recorder error. The OBS recovered in 2014

  15. Ross Ice Shelf Seismic Survey and Future Drilling Recommendation

    Science.gov (United States)

    van Haastrecht, Laurine; Ohneiser, Christian; Gorman, Andrew; Hulbe, Christina

    2016-04-01

    The Ross Ice Shelf (RIS) is one of three gateways through which change in the ocean can be propagated into the interior of West Antarctica. Both the geologic record and ice sheet models indicate that it has experienced widespread retreat under past warm climates. But inland of the continental shelf, there are limited data available to validate the models. Understanding what controls the rate at which the ice shelf will respond to future climate change is central to making useful climate projections. Determining the retreat rate at the end of the last glacial maximum is one part of this challenge. In November 2015, four lines of multi-channel seismic data, totalling over 45 km, were collected on the Ross Ice Shelf, approximately 300 km south of Ross Island using a thumper seismic source and a 96 channel snow streamer. The seismic survey was undertaken under the New Zealand Antarctic Research Institute (NZARI) funded Aotearoa New Zealand Ross Ice Shelf Programme to resolve bathymetric details and to image sea floor sediments under a proposed drilling site on the ice shelf, at about 80.7 S and 174 E. The thumper, a purpose-built, trailer mounted, weight-drop seismic source was towed behind a Hägglund tracked vehicle to image the bathymetry and sediments underneath the RIS. Seismic data collection on an ice shelf has unique challenges, in particular strong attenuation of the seismic energy by snow and firn, and complex multiple ray paths. The thumper, which consists of a heavy weight (250kg) that is dropped on a large, ski mounted steel plate, produced a consistent, repeatable higher energy signal when compared to sledge hammer source and allowed for a greater geographic coverage and lower environmental impact than an explosive source survey. Our survey revealed that the seafloor is smooth and that there may be up to 100 m of layered sediments beneath the seafloor and possibly deeper, more complex structures. A multiple generated by internally reflected seismic energy

  16. Unique manifestations of mixed-phase cloud microphysics over Ross Island and the Ross Ice Shelf, Antarctica

    Science.gov (United States)

    Scott, Ryan C.; Lubin, Dan

    2016-03-01

    Spaceborne radar and lidar observations from the CloudSat and CALIPSO satellites are used to compare seasonal variations in the microphysical and radiative properties of clouds over Ross Island, Antarctica, with two contrasting Arctic atmospheric observatories located in Barrow, Alaska, and Summit, Greenland. At Ross Island, downstream from recurrent intrusions of marine air over the West Antarctic Ice Sheet and eastern Ross Ice Shelf, clouds exhibit a tendency toward the greatest geometrical thickness and coldest temperatures in summer, the largest average ice water content, IWC, at low altitude during summer and autumn, the most abundant IWC at cold mixed-phase temperatures (-40°C

  17. Cirurgia de Ross em crianças Ross procedure in children

    Directory of Open Access Journals (Sweden)

    Valdester Cavalcante PINTO Jr

    1999-04-01

    Full Text Available Objetivo: Os substitutos valvares atuais não preenchem os requisitos de uma prótese ideal. A técnica de Ross tenta oferecer, principalmente às crianças, um auto-enxerto em posição aórtica, livre de eventos tromboembólicos, hemólise e com excepcional durabilidade. O homoenxerto em posição pulmonar também tem mostrado bom desempenho a longo prazo. Nosso objetivo é demonstrar a viabilidade da técnica e os resultados da experiência inicial com o procedimento. Casuística e Métodos: Foram operados entre jan/97 e dez/98, 12 pacientes. Insuficiência aórtica - 5 casos, insuficiência aórtica e mitral - 3 casos, insuficiência aórtica e membrana subaórtica - 2 casos, estenose aórtica - 1 caso, reoperação de plastia da valva aórtica - 1 caso. O sexo predominante foi o masculino (75%. A idade variou de 8 a 15 anos (M = 12,17±2,04. A classe funcional III representou 58,3% e II 41,7%. A avaliação pré-operatória foi realizada com auxílio do ecocardiograma e pós-operatória com ecocardiograma e cateterismo cardíaco. Os homoenxertos utilizados foram mantidos em solução preservante antibiótica. Os procedimentos foram realizados com circulação extracorpórea e cardioplegia cristalóide gelada. Resultados: As intercorrências foram: febre 75%, insuficiência cardíaca congestiva (ICC 25%, hipertensão arterial sistêmica (HAS 33,3%, sangramento 8,33%, hipersecreção pulmonar 8,33% e isquemia miocárdica 8,33%. Ecocardiograma pós-operatório demonstrou insuficiência aórtica discreta em 4 casos. Angiocardiografia evidenciou ausência de insuficiência aórtica ou pulmonar, gradiente VE-Ao em 2 casos (16 mmHg e 9 mmHg e gradiente VD-TP em 2 casos (13,5 mmHg e 9,5 mmHg. Encontram-se em classe funcional I (91,6% e II (8,4%. Conclusões: A técnica é eficaz, reprodutível e de baixa mortalidade. É necessário maior tempo de acompanhamento para avaliação dos enxertos.Current prosthetic replacement for aortic valve disease

  18. Downslope flow across the Ross Sea shelf break (Antarctica)

    Science.gov (United States)

    Bergamasco, A.; Budillon, G.; Carniel, S.; Defendi, V.; Meloni, R.; Paschini, E.; Sclavo, M.; Spezie, G.

    2003-12-01

    The analysis of some high-resolution hydrological data sets acquired during the 1997, 1998, 2001 and 2003 austral summers across the Ross Sea continental shelf break are here presented. The main focus of these cruises carried out in the framework of the Italian National Antarctic Program was the investigation of the downslope flow of the dense waters originated inside the Ross Sea. Such dense waters, flow near the bottom and, reaching the continental shelf break, ventilate the deep ocean. Two Antarctic continental shelf mechanisms can originate dense and deep waters. The former mechanism involves the formation, along the Victoria Land coasts, of a dense and saline water mass, the High Salinity Shelf Water (HSSW). The HSSW formation is linked to the rejection of salt into the water column as sea ice freezes, especially during winter, in the polynya areas, where the ice is continuously pushed offshore by the strong katabatic winds. The latter one is responsible of the formation of a supercold water mass, the Ice Shelf Water (ISW). The salt supplied by the HSSW recirculated below the Ross Ice Shelf, the latent heat of melting and the heat sink provided by the Ross Ice Shelf give rise to plumes of ISW, characterized by temperatures below the sea-surface freezing point. The dense shelf waters migrate to the continental shelf-break, spill over the shelf edge and descend the continental slope as a shelf-break gravity current, subject to friction and possibly enhanced by topographic channelling. Friction, in particular, breaks the constraint of potential vorticity conservation, counteracting the geostrophic tendency for along slope flow. The density-driven downslope motion or cascading entrains ambient water, namely the lower layer of the CDW, reaches a depth where density is the same and spreads off-slope. In fact, the cascading event is inhibited by friction without entrainment. The downslope processes are important for the ocean and climate system because they play a

  19. Cryptoendolithic lichen and cyanobacterial communities of the Ross Desert, Antarctica

    Science.gov (United States)

    Friedmann, E. I.; Hua, M.; Ocampo-Friedmann, R.

    1988-01-01

    Cryptoendolithic microbial communities in the Ross Desert (McMurdo Dry Valleys) are characterized on the basis of photosynthetic microorganisms and fungi. Two eukaryotic communities (the lichen-dominated and Hemichloris communities) and three cyanobacterial communities (the red Gloeocapsa, Hormathonema-Gloeocapsa, and Chroococcidiopsis communities) are described. Eleven coccoid, one pleurocapsoid, and five filamentous cyanobacteria occurring in these communities are characterized and illustrated. The moisture grade of the rock substrate seems to affect pH, formation of primary iron stain, and the distribution of microbial communities.

  20. The Era of Newton, Herschel and Lord Rosse

    Science.gov (United States)

    Bennett, Jim

    2009-08-01

    In the eighteenth century England was dominant in building telescopes and instrumentation. This paper describes the contributions of the most important opticians and telescope builders, from Newton’s Opticks and the telescope design that bears his name, through various instrument makers who constructed ‘popular’ telescopes and published descriptions of mirror grinding (Smith, the Dollonds and their patent on achromatic lenses), to Herschel, who refined the description of his polishing procedures, and Lord Rosse, who attempted to communicate his through publication. The narrative of theory, practice and communication takes unexpected turns.

  1. Uma releitura da obra de Elisabeth Kubler-Ross

    OpenAIRE

    Afonso, Selene Bevil??qua Chaves; Minayo, Maria Cec??lia de Souza

    2013-01-01

    Este artigo apresenta uma releitura de parte da obra de Elizabeth Ross, uma das autoras mais citadas sobre a quest??o da terminalidade da vida, do luto e do morrer. Sua obra tem sido de grande contribui????o tanto para os profissionais de sa??de como para pais, m??es, filhos, parentes, leigos e religiosos que vivenciam o luto. Tamb??m tem sido alvo de controv??rsias relacionadas a quest??es ??ticas e quanto a seu rigor cient??fico. Os livros aqui comentados s??o: On...

  2. Jimmy, Sinclair, and Jim: on the biographical trail of James Sinclair Ross Jimmy, Sinclair, and Jim: on the biographical trail of James Sinclair Ross

    Directory of Open Access Journals (Sweden)

    John J. O'Connor

    2008-04-01

    Full Text Available The deaths of Earle Birney and Robertson Davies late in 1995 reminded readers of Canadian literature that the old order—those writers born before the First World War—was quickly passing. Of the major figures born in the early years of this century (Birney, Davies, Callaghan, MacLennan, Ross, only Ross was still living at the beginning of 1996, albeit in very poor health in a nursing home in Vancouver. The deaths of Earle Birney and Robertson Davies late in 1995 reminded readers of Canadian literature that the old order—those writers born before the First World War—was quickly passing. Of the major figures born in the early years of this century (Birney, Davies, Callaghan, MacLennan, Ross, only Ross was still living at the beginning of 1996, albeit in very poor health in a nursing home in Vancouver.

  3. 76 FR 55404 - Announcement of Funding Awards Resident Opportunity and Self-Sufficiency (ROSS)-Service...

    Science.gov (United States)

    2011-09-07

    ... URBAN DEVELOPMENT Announcement of Funding Awards Resident Opportunity and Self- Sufficiency (ROSS... Availability (NOFA) for the Resident Opportunity and Self-Sufficiency (ROSS)-Service Coordinators Program. This announcement contains the consolidated names and addresses of the award recipients for this year under the...

  4. 77 FR 30320 - General Management Plan/Environmental Impact Statement, Ross Lake National Recreation Area, North...

    Science.gov (United States)

    2012-05-22

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF THE INTERIOR National Park Service General Management Plan/Environmental Impact Statement, Ross Lake National Recreation... the Final Environmental Impact Statement for the new General Management Plan (GMP) for Ross...

  5. 75 FR 32802 - Certificate of Alternative Compliance for the Offshore Supply Vessel ROSS CANDIES

    Science.gov (United States)

    2010-06-09

    ... SECURITY Coast Guard Certificate of Alternative Compliance for the Offshore Supply Vessel ROSS CANDIES... Alternative Compliance was issued for the offshore supply vessel ROSS CANDIES as required by 33 U.S.C. 1605(c... Title 33, Code of Federal Regulation, part 81, has been issued for the offshore supply vessel...

  6. Giving to Excellence: Generating Philanthropic Support for UK Higher Education. Ross-CASE Report 2016

    Science.gov (United States)

    Jain, Yashraj

    2016-01-01

    This report presents findings from the 2016 Ross-CASE Survey of Philanthropic Giving to Universities in UK. The project was conducted by CASE Europe and funded by HEFCE and the Ross-Group. This year's survey comes at a time of great change for the UK charity sector. The historical trend data of previous surveys will be invaluable in helping…

  7. 75 FR 69432 - Ross Bachofer v. Calpine Corporation; Notice of Complaint

    Science.gov (United States)

    2010-11-12

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Ross Bachofer v. Calpine Corporation; Notice of Complaint November 4, 2010..., 18 CFR 385.206 and section 206 of the Federal Power Act, 16 U.S.C. 2824c, Ross Bachofer...

  8. Critiquing Research Methodology: Comments on Broader Concerns about Complex Statistical Studies. A Response to Ross

    Science.gov (United States)

    Stapleton, Paul

    2006-01-01

    Steven Ross's (2005) recent paper empirically measuring the efficacy of formative assessment compared to the summative variety found that the former produced positive effects on some aspects of language learning. In this critique, it is contended that Ross's study is flawed because his two groups of learners, one receiving summative assessment and…

  9. Against Raising Hope of Raising the Dead: Contra Moody and Kubler-Ross.

    Science.gov (United States)

    Vicchio, Stephen J.; And Others

    1979-01-01

    Kubler-Ross and Moody have made assertions about survival after death. They argued that the subjects were not dead, but in the process of dying. An alternative explanation to this "glimpse of the afterlife" approach is offered. Other theological objections are raised to the Moody/Kubler-Ross approach. (Author)

  10. Against Raising Hope of Raising the Dead: Contra Moody and Kubler-Ross.

    Science.gov (United States)

    Vicchio, Stephen J.; And Others

    1979-01-01

    Kubler-Ross and Moody have made assertions about survival after death. They argued that the subjects were not dead, but in the process of dying. An alternative explanation to this "glimpse of the afterlife" approach is offered. Other theological objections are raised to the Moody/Kubler-Ross approach. (Author)

  11. Does temperature structure phytoplankton community composition in the Ross Sea, Antarctica?

    Science.gov (United States)

    The Ross Sea polynya experiences one of the largest phytoplankton blooms in the Southern Ocean. Energy flow potential within the Ross Sea food web is primarily set by diatoms and prymnesiophytes, the latter dominated by Phaeocystis antarctica. We investigated physical, chemical,...

  12. Three artotrogids (Crustacea: Copepoda: Siphonostomatoida from the Ross Sea, Antarctica

    Directory of Open Access Journals (Sweden)

    Mercedes Conradi

    2014-12-01

    Full Text Available The Artotrogidae, one of the most primitive of siphonostomatoid families, consists currently of 117 species in 21 genera. Most of these species (65% are poorly or incompletely described since they have been rarely recorded in recent decades and, when encountered, have been found in very low numbers. During the 19th Italian Antarctic Expedition, with the RV Italica, to the Ross Sea in austral summer 2004, some artotrogid copepods were collected. This paper redescribes two species of artotrogid copepods, which are known only from the Southern Ocean, Neobradypontius neglectus and Cryptopontius latus, and describes for the first time a male of the genus Neobradypontius. Furthermore, a new species is described and added to Sestropontius, increasing the number of known species of this genus to three. The main discrepancies between the original descriptions and the specimens of the two species collected from the Ross Sea redescribed here were on the armature of the antennary exopod and leg 5. The new species, Sestropontius italicae, shares with its most similar congener, S. mckinnoni, the armature of the third endopodal segment of leg 1 and leg 2 and that of the third exopodal segment of leg 4. However, the segmentation of the antennae and the armature on the antennary exopod are different.

  13. The oceanography and ecology of the Ross Sea.

    Science.gov (United States)

    Smith, Walker O; Ainley, David G; Arrigo, Kevin R; Dinniman, Michael S

    2014-01-01

    The continental shelf of the Ross Sea exhibits substantial variations in physical forcing, ice cover, and biological processes on a variety of time and space scales. Its circulation is characterized by advective inputs from the east and exchanges with off-shelf regions via the troughs along the northern portions. Phytoplankton biomass is greater there than anywhere else in the Antarctic, although nitrate is rarely reduced to levels below 10 μmol L(-1). Overall growth is regulated by irradiance (via ice at the surface and by the depths of the mixed layers) and iron concentrations. Apex predators reach exceptional abundances, and the world's largest colonies of Adélie and emperor penguins are found there. Krill are represented by two species (Euphausia superba near the shelf break and Euphausia crystallorophias throughout the continental shelf region). Equally important and poorly known is the Antarctic silverfish (Pleuragramma antarcticum), which is also consumed by most upper-trophic-level predators. Future changes in the Ross Sea environment will have profound and unpredictable effects on the food web.

  14. Decadal trends in air-sea CO2 exchange in the Ross Sea (Antarctica)

    Science.gov (United States)

    Tagliabue, Alessandro; Arrigo, Kevin R.

    2016-05-01

    Highly productive Antarctic shelf systems, like the Ross Sea, play important roles in regional carbon budgets, but the drivers of local variations are poorly quantified. We assess the variability in the Ross Sea carbon cycle using a regional physical-biogeochemical model. Regionally, total partial pressure of CO2 (pCO2) increases are largely controlled by the biological pump and broadly similar to those in the offshore Southern Ocean. However, this masks substantial local variability within the Ross Sea, where interannual fluctuations in total pCO2 are driven by the biological pump and alkalinity, whereas those for anthropogenic pCO2 are related to physical processes. Overall, the high degree of spatial variability in the Ross Sea carbon cycle causes extremes in aragonite saturation that can be as large as long-term trends. Therefore, Antarctic shelf polynya systems like the Ross Sea will be strongly affected by local processes in addition to larger-scale phenomena.

  15. Past ice-sheet behaviour: retreat scenarios and changing controls in the Ross Sea, Antarctica

    Science.gov (United States)

    Halberstadt, Anna Ruth W.; Simkins, Lauren M.; Greenwood, Sarah L.; Anderson, John B.

    2016-05-01

    Studying the history of ice-sheet behaviour in the Ross Sea, Antarctica's largest drainage basin can improve our understanding of patterns and controls on marine-based ice-sheet dynamics and provide constraints for numerical ice-sheet models. Newly collected high-resolution multibeam bathymetry data, combined with two decades of legacy multibeam and seismic data, are used to map glacial landforms and reconstruct palaeo ice-sheet drainage. During the Last Glacial Maximum, grounded ice reached the continental shelf edge in the eastern but not western Ross Sea. Recessional geomorphic features in the western Ross Sea indicate virtually continuous back-stepping of the ice-sheet grounding line. In the eastern Ross Sea, well-preserved linear features and a lack of small-scale recessional landforms signify rapid lift-off of grounded ice from the bed. Physiography exerted a first-order control on regional ice behaviour, while sea floor geology played an important subsidiary role. Previously published deglacial scenarios for Ross Sea are based on low-spatial-resolution marine data or terrestrial observations; however, this study uses high-resolution basin-wide geomorphology to constrain grounding-line retreat on the continental shelf. Our analysis of retreat patterns suggests that (1) retreat from the western Ross Sea was complex due to strong physiographic controls on ice-sheet drainage; (2) retreat was asynchronous across the Ross Sea and between troughs; (3) the eastern Ross Sea largely deglaciated prior to the western Ross Sea following the formation of a large grounding-line embayment over Whales Deep; and (4) our glacial geomorphic reconstruction converges with recent numerical models that call for significant and complex East Antarctic ice sheet and West Antarctic ice sheet contributions to the ice flow in the Ross Sea.

  16. 75 FR 31805 - Announcement of Funding Awards for the Resident Opportunity and Self-Sufficiency (ROSS)-Service...

    Science.gov (United States)

    2010-06-04

    ... URBAN DEVELOPMENT Announcement of Funding Awards for the Resident Opportunity and Self-Sufficiency (ROSS... Resident Opportunity and Self-Sufficiency (ROSS) Service Coordinators Program funding for Fiscal Year 2009... questions concerning the FY 2009 Resident Opportunity and Self-Sufficiency (ROSS) Service...

  17. Late Wisconsin and early holocene glacial history, inner Ross Embayment, Antarctica

    Science.gov (United States)

    Denton, George H.; Bockheim, James G.; Wilson, Scott C.; Stuiver, Minze

    1991-01-01

    Lateral drift sheets of outlet glaciers that pass through the Transantarctic Mountains constrain past changes of the huge Ross ice drainage system of the Antarctic Ice Sheet. Drift stratigraphy suggests correlation of Reedy III (Reedy Glacier), Beardmore, Britannia (Hatherton/Darwin Glaciers), Ross Sea (McMurdo Sound), and younger (Terra Nova Bay) drifts; radiocarbon dates place the outer limits of Ross Sea drift in late Wisconsin time at 24,000 to 13,000 yr B.P. Outlet glacier profiles from these drifts constrain late Wisconsin ice sheet surface elevations. Within these constraint, two extreme late Wisconsin reconstructions are given of the Ross ice drainage system. Both show little elevation change of the polar plateau coincident with extensive ice shelf grounding along the inner Ross Embayment. However, in the central Ross Embayment, one reconstruction shows floating shelf ice, where as the other shows a grounded ice sheet. Massive late Wisconsin/Holocene recession of grounded ice from the western Ross Embayment, which was underway at 13,040 yr B.P. and completed by 6600 to 6020 yr B.P., was accompanied by little change in plateau ice levels inland of the Transantarctic Mountains.

  18. Variability and Trends in Sea Ice Extent and Ice Production in the Ross Sea

    Science.gov (United States)

    Comiso, Josefino; Kwok, Ronald; Martin, Seelye; Gordon, Arnold L.

    2011-01-01

    Salt release during sea ice formation in the Ross Sea coastal regions is regarded as a primary forcing for the regional generation of Antarctic Bottom Water. Passive microwave data from November 1978 through 2008 are used to examine the detailed seasonal and interannual characteristics of the sea ice cover of the Ross Sea and the adjacent Bellingshausen and Amundsen seas. For this period the sea ice extent in the Ross Sea shows the greatest increase of all the Antarctic seas. Variability in the ice cover in these regions is linked to changes in the Southern Annular Mode and secondarily to the Antarctic Circumpolar Wave. Over the Ross Sea shelf, analysis of sea ice drift data from 1992 to 2008 yields a positive rate of increase in the net ice export of about 30,000 sq km/yr. For a characteristic ice thickness of 0.6 m, this yields a volume transport of about 20 cu km/yr, which is almost identical, within error bars, to our estimate of the trend in ice production. The increase in brine rejection in the Ross Shelf Polynya associated with the estimated increase with the ice production, however, is not consistent with the reported Ross Sea salinity decrease. The locally generated sea ice enhancement of Ross Sea salinity may be offset by an increase of relatively low salinity of the water advected into the region from the Amundsen Sea, a consequence of increased precipitation and regional glacial ice melt.

  19. Holocene glacier dynamics on James Ross Island, NE Antarctic Peninsula

    Science.gov (United States)

    Davies, B. J.; Glasser, N. F.; Hambrey, M.

    2013-12-01

    The northern Antarctic Peninsula is currently warming very rapidly, which has resulted in ice sheet thinning, ice-shelf collapse, and rapid and widespread glacier recession. These small mountain glaciers are predicted to make a large sea level contribution over the coming century. Reconstructing past rates, volumes and magnitudes of change, particularly with respect to the former configuration of former ice sheets and ice shelves, is vital to contextualise contemporary change and to improve predictions of future ice-sheet behaviour. The aim of this research is therefore to investigate the relationship of deglacial ice sheet thinning and Holocene glacier fluctuations around James Ross Island, northeast Antarctic Peninsula, with temperature changes recorded in the Mount Haddington Ice Core. We use a combination of geomorphological mapping, from field campaigns and remotely sensed images, cosmogenic nuclide ages on glacially transported boulders, and numerical modelling with a simple 1D flowline model. Prior to 18 ka, James Ross Island was inundated by a thick and mainly cold-based ice sheet, which scattered granite erratics across the island. Ice sheet thickness and the rate of thinning is constrained by granite erratics on Terrapin Hill (610 m a.s.l.), and from flat-topped mesas at 370 m a.s.l. on Ulu Peninsula. During deglaciation and a period of rapid warming and eustatic sea level rise, the area was drained by Prince Gustav Ice Stream. The ice sheet reached its current configuration by around 6 ka, with glacier readvances around 4-5 ka. At Boulder Valley, near Terrapin Hill on James Ross Island, a large glacial readvance reached the current shoreline. It pre-dated the Mid-Holocene sea level high-stand, and has shorelines imprinted upon its seaward face. After 5.3 cal. ka BP and post-dating the mid-Holocene sea level high-stand, there was a readvance of at least 7 km by glacier 'IJR-45' on Ulu Peninsula. Rapid glacier recession occurred during a period of

  20. Gaussian estimation for discretely observed Cox-Ingersoll-Ross model

    Science.gov (United States)

    Wei, Chao; Shu, Huisheng; Liu, Yurong

    2016-07-01

    This paper is concerned with the parameter estimation problem for Cox-Ingersoll-Ross model based on discrete observation. First, a new discretized process is built based on the Euler-Maruyama scheme. Then, the parameter estimators are obtained by employing the maximum likelihood method and the explicit expressions of the error of estimation are given. Subsequently, the consistency property of all parameter estimators are proved by applying the law of large numbers for martingales, Holder's inequality, B-D-G inequality and Cauchy-Schwarz inequality. Finally, a numerical simulation example for estimators and the absolute error between estimators and true values is presented to demonstrate the effectiveness of the estimation approach used in this paper.

  1. [A reappraisal of the works of Elisabeth Kubler-Ross].

    Science.gov (United States)

    Afonso, Selene Beviláqua Chaves; Minayo, Maria Cecília de Souza

    2013-09-01

    This article presents a reappraisal of part of the works of Elizabeth Kubler-Ross, one of the most quoted authors addressing the end of life process, mourning and dying. Her work has contributed to a clearer understanding of these issues by health professionals, families, religious and lay people who handle and/or experience mourning. She has also been the subject of controversy related to ethical issues and the scientific rigor of her work. The books analyzed in this article are: On death and dying (1969); Questions and answers on death and dying (1971); Living with death and dying (1981); On children and death(1983); On life after death (1991) and Life lessons (2000).

  2. Uma releitura da obra de Elisabeth Kubler-Ross

    OpenAIRE

    Selene Beviláqua Chaves Afonso; Maria Cecília de Souza Minayo

    2013-01-01

    Este artigo apresenta uma releitura de parte da obra de Elizabeth Ross, uma das autoras mais citadas sobre a questão da terminalidade da vida, do luto e do morrer. Sua obra tem sido de grande contribuição tanto para os profissionais de saúde como para pais, mães, filhos, parentes, leigos e religiosos que vivenciam o luto. Também tem sido alvo de controvérsias relacionadas a questões éticas e quanto a seu rigor científico. Os livros aqui comentados são: On death and dying (Sobre A morte e o mo...

  3. A case of Ross syndrome presented with Horner and chronic cough

    Directory of Open Access Journals (Sweden)

    Aslihan Baran

    2014-01-01

    Full Text Available Ross syndrome is a rare sweating disorder associated with Adie′s tonic pupil, decreased or diminished tendon reflex and unknown etiology. Although autonomic disturbances affecting sudomotor and vasomotor functions are seen commonly, they are rarely symptomatic. While Ross syndrome is typically characterized with dilated tonic pupil, it may be rarely manifested with miotic pupils (little old Adie′s pupil, which can make diagnosis difficult. In this article, we aim to specify the atypical clinical manifestations of syndrome by means of Ross syndrome manifested by autonomic symptoms, Horner syndrome, chronic cough together with bilateral little old Adie′s pupil.

  4. Geology and geomorphology--Offshore of Fort Ross Map Area, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the geologic and geomorphic map of the Offshore of Fort Ross map area, California. The vector data file is included in...

  5. NIST Computer Scientist and Researcher Dr. Ron Ross Discusses Cybersecurity During Latest SGL

    OpenAIRE

    2010-01-01

    National Institute of Standards and Technology (NIST) senior computer scientist and information security researcher Dr. Ron Ross presented a lecture to students, staff and faculty on the new challenges in cybersecurity.

  6. In memoriam: Mr Donald Nixon Ross 4 October 1922 to 7 July 2014 (91 years).

    Science.gov (United States)

    Yankah, Charles

    2014-01-01

    We are deeply saddened by the loss of our great teacher Donald Ross, a truly global mentor in cardiac surgery, a friend, a respectful colleague, an admirer, and custodian of our profession, who passed away on July 7, 2014.

  7. Geology and geomorphology--Offshore of Fort Ross Map Area, California

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This part of DS 781 presents data for the geologic and geomorphic map of the Offshore of Fort Ross map area, California. The vector data file is included in...

  8. Parcels and Land Ownership, Published in unknown, Ross County Soil and Water Conservation District (SWCD).

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Parcels and Land Ownership dataset as of unknown. The extent of these data is generally Ross County, OH. This metadata was auto-generated through the Ramona GIS...

  9. Multichannel Seismic Reflection Data - SCAR - Ross Sea 1987-1988, SDLS CD-ROM vol 2

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data are stacked multichannel marine seismic reflection data from six lines recorded during 1988 in the Ross Sea, Antarctica, by the Bundesanstalt fur...

  10. Multichannel Seismic Reflection Data - SCAR - Ross Sea 1980, SDLS, CD-ROM vol 5

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data are stacked multichannel marine seismic reflection data from eleven lines recorded during 1980 in the Ross Sea, Antarctica, by the Bundesanstalt fur...

  11. Elisabeth Kubler-Ross and the Tradition of the Private Sphere: An Analysis of Symbols.

    Science.gov (United States)

    Klass, Dennis

    1981-01-01

    Shows how Kubler-Ross' schema functions as a symbol system. Analyzes the symbol "acceptance." Shows how that symbol is part of a strong American tradition of symbols of the private sphere. (Author/JAC)

  12. Multichannel Seismic Reflection Data - SCAR - Ross Sea 1982, SDLS CD-ROM vol 12

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data are stacked multichannel marine seismic reflection data from seven lines recorded during 1982 in the Ross Sea, Antarctica, by the Institut Francais du...

  13. Multichannel Seismic Reflection Data - SCAR - Ross Sea - 1987, SDLS CD-ROM vol 13

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data are stacked multichannel marine seismic reflection data recorded during the 1987 field season in the Ross Sea, Antarctica, by SEVMORGEOLOGIA, RUSSIA. The...

  14. Multichannel Seismic Reflection Data - SCAR - Ross Sea - 1980, SDLS, CD-ROM vol 4

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data are stacked multichannel marine seismic reflection data from seven lines recorded during 1980 in the Ross Sea, Antarctica, by the Bundesanstalt fur...

  15. Multichannel Seismic Reflection Data - SCAR - Ross Sea - 1980, SDLS CD-ROM vol 3

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data are stacked multichannel marine seismic reflection data from four lines recorded during 1980 in the Ross Sea, Antarctica, by the Bundesanstalt fur...

  16. Multichannel Seismic Reflection Data - SCAR - Ross Sea - 1989, SDLS CD-ROM vol 14

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data are stacked multichannel marine seismic reflection data recorded during 1989 field season in the Ross Sea, Antarctica, by the SEVMORGEOLOGIA, RUSSIS. The...

  17. Multichannel Seismic Reflection Data - SCAR, Ross Sea - 1982-1983, CD-ROM vol 9

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — These data are stacked multichannel marine seismic reflection data from fourteen lines recorded during 1982 in the Ross Sea and Wilkes Island, Antarctica, by the...

  18. 波特小说中矛盾的宗教观∗%Katherine Anne Porter's Ambivalent Religious Thoughts in Her Fiction Works

    Institute of Scientific and Technical Information of China (English)

    朱琳

    2016-01-01

    Religious awareness and attitudes are an important constituent part of the rich connotation in Katherine Anne Porter's fiction works.In her representative works of “Flowering Judas",“The Jilting of Granny Weatherall”,“Pale Horse,Pale Rider”,confronting betrayal,death,nothingness in a world full of disaster and crisis,those female protagonists with the Catholic faith,feel lost and disillusioned,and try to find the meaning of living and spiritual support strength.This shows Porter's ambivalence of religious belief,her tragical awareness about modern religion and efforts to look for spiritual faith.%宗教意识和态度,凯瑟琳·安妮·波特小说创作丰富意蕴的重要构成部分。在她的代表作«开花的犹大树»«被遗弃的韦瑟罗尔奶奶»«灰色马,灰色的骑手»中,有着天主教信仰的女主人公们,在充满灾难、危机的世界里面对背叛、死亡、虚无,感到迷惘、幻灭,艰难寻找着生存的意义和支撑。由此可见波特对宗教既渴望相信又持深深怀疑的矛盾心态、对所处时代宗教危机的感知和寻找精神信靠的努力。

  19. O ecocardiograma transesofágico na cirurgia de Ross

    Directory of Open Access Journals (Sweden)

    Marcello Fonseca Salgado Filho

    2011-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Uma das cirurgias corretivas para a insuficiência aórtica congênita grave é a cirurgia de Ross. O ecocardiograma transesofágico intraoperatório é indispensável para uma boa avaliação cirúrgica. Além disso, é capaz de avaliar o perfil volêmico e a necessidade de se administrar drogas vasoativas ao longo da cirurgia. RELATO DO CASO: Adolescente de 15 anos apresentava insuficiência aórtica grave de origem congênita, programando-se correção cirúrgica pela técnica de Ross. No centro cirúrgico, o paciente foi monitorado com eletrocardiograma e oxímetro de pulso, recebendo pré-medicação com midazolam. Após a pré-medicação, puncionaram-se a artéria radial esquerda e a veia subclávia direita. A indução anestésica foi feita com etomidato, cisatracúrio e fentanil, e a manutenção anestésica com sevoflurano. A sonda do aparelho do ecocardiograma transesofágico foi introduzida imediatamente após a intubação traqueal e mostrava aumento do ventrículo esquerdo; insuficiência aórtica grave por falha de coaptação dos três folhetos; válvula pulmonar competente sem alterações anatômicas e fisiológicas. A cirurgia transcorreu sem intercorrências, com 120 minutos de circulação extracorpórea (CEC e 8 horas de cirurgia. Imediatamente após a saída de CEC, o ecocardiograma transesofágico mostrava bom funcionamento tanto do auto como do homoenxerto, porém o ventrículo direito encontrava-se hipocontrátil, o que foi corrigido com bolus de milrinona, seguido de infusão contínua. O paciente foi encaminhado ao pós-operatório intubado, estável hemodinamicamente, com infusão de milrinona e nitroprussiato de sódio. CONCLUSÕES: Uma das técnicas de correção da insuficiência aórtica congênita é a cirurgia de Ross, em que o ecocardiograma transesofágico intraoperatório orienta o cirurgião de maneira precisa sobre o status fisiológico e anatômico dos enxertos vasculares.

  20. Frank Ross's Early Direct Photographs of Venus and His Interpretation of Them

    Science.gov (United States)

    Osterbrock, Donald E.

    2006-09-01

    Frank Ross was an outstandingly creative astronomical "jack of many trades" (Monet) or "cat with nine astronomical lives". After joining the Yerkes Observatory faculty in 1924, at age 50, he took a long series of almost nightly direct photographs of Venus in 1927 with the Mount Wilson 60-inch and 100-inch reflectors as a guest observer. He published many of these images in the ApJ in 1928, with his conclusions on the nature of Venus. Ross discovered markings, seen only in the ultraviolet images, parallel "belts" indicating rotation. They changed rapidly. From these photographs he developed a tentative picture of a deep opaque atmosphere, with high pressure at the surface of the planet. The changes were due to "violent events" (winds or storms) in its atmosphere. From spectroscopic results of Slipher, Adams, StJohn, and Nicholson he took the rotation period to be long. But bolometric observations of Pettit, Nicholson, Coblentz, and Lampland, indicated little temperature change between the illuminated and dark parts of the disk, so it could not be too slow. Ross settled on a "compromise" rotation period of about 30 days based on the data he had. The spectroscopic measurements showed there was very little, if any, H2O or O2 in the atmosphere. Ross is best known today for his Ross wide-angle camera design, his Ross high-proper-motion stars, his Ross photometer, and his Ross correctors for large reflecting telescopes, but his foray into planetary astronomy, long before the era of radar or close-up imaging and spectroscopy from space vehicles, was an important first step toward understanding Venus. His years of experience in laboratory studies of the properties of photographic plates, developers, and mensuration were highly important for this work. Equally so were his cheerful, peppery personality and his close relations with many Mount Wilson and Lowell Observatory staff members.

  1. Donald Nixon Ross, BS, MB, ChB, FRCS: pioneering surgeon and true gentleman.

    Science.gov (United States)

    Chitwood, W Randolph

    2015-03-01

    Donald Nixon Ross, FRCS, was a master surgeon, a consummate scholar, and fine gentleman. Herein, are descriptions of his education, practice of cardiac surgery, and legacy contributions. He always will be known for developing and applying the aortic autograft "switch" procedure for aortic stenosis known in perpetuity as the Ross procedure. Copyright © 2015 The Society of Thoracic Surgeons. Published by Elsevier Inc. All rights reserved.

  2. Landscapes of the Self: The Cinema of Ross McElwee / Paisajes del yo. El cine de Ross McElwee

    OpenAIRE

    E. Cuevas; García-Martínez, A.N. (Alejandro Néstor)

    2008-01-01

    Monografía sobre el documentalista Ross McElwee. Incluye 9 capítulos que estudian su obra, un texto suyo y una entrevista. El libro está en inglés y castellano. Este enlace incluye sólo el índice y la introducción A monography about the films of American documentary filmmaker Ross McElwee. It includes 9 chapters about his work, one text written by him, and an interview. The book is in English and Spanish. This link includes only the Table of Contents and the Introduction.

  3. Neogene Development of the Terror Rift, western Ross Sea, Antarctica

    Science.gov (United States)

    Sauli, C.; Sorlien, C. C.; Busetti, M.; De Santis, L.; Wardell, N.; Henrys, S. A.; Geletti, R.; Wilson, T. J.; Luyendyk, B. P.

    2015-12-01

    Terror Rift is a >300 km-long, 50-70 km-wide, 14 km-deep sedimentary basin at the edge of the West Antarctic Rift System, adjacent to the Transantarctic Mountains. It is cut into the broader Victoria Land Basin (VLB). The VLB experienced 100 km of mid-Cenozoic extension associated with larger sea floor spreading farther north. The post-spreading (Neogene) development of Terror Rift is not well understood, in part because of past use of different stratigraphic age models. We use the new Rossmap seismic stratigraphy correlated to Cape Roberts and Andrill cores in the west and to DSDP cores in the distant East. This stratigraphy, and new fault interpretations, was developed using different resolutions of seismic reflection data included those available from the Seismic Data Library System. Depth conversion used a new 3D velocity model. A 29 Ma horizon is as deep as 8 km in the south, and a 19 Ma horizon is >5 km deep there and 4 km-deep 100 km farther north. There is a shallower northern part of Terror Rift misaligned with the southern basin across a 50 km right double bend. It is bounded by steep N-S faults down-dropping towards the basin axis. Between Cape Roberts and Ross Island, the Oligocene section is also progressively-tilted. This Oligocene section is not imaged within northern Terror Rift, but the simplest hypothesis is that some of the Terror Rift-bounding faults were active at least during Oligocene through Quaternary time. Many faults are normal separation, but some are locally vertical or even reverse-separation in the upper couple of km. However, much of the vertical relief of the strata is due to progressive tilting (horizontal axis rotation) and not by shallow faulting. Along the trend of the basin, the relief alternates between tilting and faulting, with a tilting margin facing a faulted margin across the Rift, forming asymmetric basins. Connecting faults across the basin form an accommodation zone similar to other oblique rifts. The Neogene basin is

  4. Mass Balance and Structure of the Ross Ice Shelf

    Science.gov (United States)

    Das, I.; Padman, L.; Chu, W.; Fricker, H. A.; Becker, M. K.; Bell, R. E.; Tinto, K. J.; Millstein, J. D.

    2016-12-01

    Changes in ice shelf mass balance is key to the long term stability of the Antarctic ice sheet. Although the most extensive thinning occurs on the Amundsen Sea sector of West Antarctica, recent studies indicate that many other ice shelves are also experiencing widespread thinning. Here, we focus on the Ross Ice Self. An 18-year record (1994-2012) of satellite radar altimetry shows elevation change 1 m/yr across the shelf. Significant variability in ice shelf height on interannual time scales makes it difficult to detect a long-term mass budget trend of this ice shelf. Variability of radar signal penetration into the ice-shelf snow and firn layers further complicates assessment of mass changes. In this work, we investigate the Ross Ice Shelf mass balance using aerogeophyical data from the ROSETTA-ICE IcePod and NASA's Operation IceBridge. ROSSETTA-ICE is an aerogeophysical program planned to survey the ice shelf at a 10 km spacing over the course of two field seasons-2015 and 2016. This NSF/Moore Foundation supported multi-University collaborative project is designed to provide an integrated view of the ice shelf and the underlying bathymetry using the IcePod system including its ice-penetrating radars, laser altimetry, gravity meters and magnetometers. We present preliminary results from our ongoing efforts of quantifying the mass balance of the ice shelf using IcePod ice penetrating radars and laser altimetry along with satellite data. We will use internal layers traced from ice penetrating radars to outline the structure of the ice shelf. Airborne laser altimetry measurements from this IcePod survey and IceBridge will be used to study the elevation change of the ice shelf. Spatial variations of thickness of the internal layers in the first few meters of the ice shelf, particularly near the grounding line, will indicate the impact of wind-blown snow coming from the continent onto the ice shelf. In order to infer conditions of melt and freeze-on at the ice

  5. Ross, macdonald, and a theory for the dynamics and control of mosquito-transmitted pathogens.

    Science.gov (United States)

    Smith, David L; Battle, Katherine E; Hay, Simon I; Barker, Christopher M; Scott, Thomas W; McKenzie, F Ellis

    2012-01-01

    Ronald Ross and George Macdonald are credited with developing a mathematical model of mosquito-borne pathogen transmission. A systematic historical review suggests that several mathematicians and scientists contributed to development of the Ross-Macdonald model over a period of 70 years. Ross developed two different mathematical models, Macdonald a third, and various "Ross-Macdonald" mathematical models exist. Ross-Macdonald models are best defined by a consensus set of assumptions. The mathematical model is just one part of a theory for the dynamics and control of mosquito-transmitted pathogens that also includes epidemiological and entomological concepts and metrics for measuring transmission. All the basic elements of the theory had fallen into place by the end of the Global Malaria Eradication Programme (GMEP, 1955-1969) with the concept of vectorial capacity, methods for measuring key components of transmission by mosquitoes, and a quantitative theory of vector control. The Ross-Macdonald theory has since played a central role in development of research on mosquito-borne pathogen transmission and the development of strategies for mosquito-borne disease prevention.

  6. Quantifying fall migration of Ross's gulls (Rhodostethia rosea) past Point Barrow, Alaska

    Science.gov (United States)

    Uher-Koch, Brian D.; Davis, Shanti E.; Maftei, Mark; Gesmundo, Callie; Suydam, R.S.; Mallory, Mark L.

    2014-01-01

    The Ross's gull (Rhodostethia rosea) is a poorly known seabird of the circumpolar Arctic. The only place in the world where Ross's gulls are known to congregate is in the near-shore waters around Point Barrow, Alaska where they undertake an annual passage in late fall. Ross's gulls seen at Point Barrow are presumed to originate from nesting colonies in Siberia, but neither their origin nor their destination has been confirmed. Current estimates of the global population of Ross's gulls are based largely on expert opinion, and the only reliable population estimate is derived from extrapolations from previous counts conducted at Point Barrow, but these data are now over 25 years old. In order to update and clarify the status of this species in Alaska, our study quantified the timing, number, and flight direction of Ross's gulls passing Point Barrow in 2011. We recorded up to two-thirds of the estimated global population of Ross's gulls (≥ 27,000 individuals) over 39 days with numbers peaking on 16 October when we observed over 7,000 birds during a three-hour period.

  7. A frágil realidade de plástico: um estudo comparativo da imagem “Casa de Bonecas” em Henrik Ibsen e Katherine Mansfield = The fragile plastic reality: a comparative study of the image “Doll’s House” in Henrik Ibsen and Katherine Mansfield

    Directory of Open Access Journals (Sweden)

    Talita Annunciato Rodrigues

    2010-01-01

    Full Text Available Considerando a importância das significações nas obras literárias, este trabalho propõe um estudo comparativo da imagem da casa de bonecas na peça Casa de Bonecas (1879, de Henrik Ibsen, e no conto “The Doll’s House”, publicado no livro The Dove’s Nest (1923, de Katherine Mansfield, tendo como base a teoria de Gaston Bachelard e Jean Baudrillard. Em ambos os casos, percebe-se que a presença dessa imagem indica não apenas a construção do ambiente dessas obras, mas também uma crítica ao modelo burguês de sociedade aparentemente perfeita, sem falhas, como remete a própria imagem descrita. Entretanto, pode-se considerar que a imagem, embora partilhe a mesma ideia em ambas as obras, é explorada diferentemente em cada caso, seja pela luta da personagem Nora em escapar da conformidade social em Ibsen, seja pela sutil brincadeira de criança vivenciada pelas irmãs Kelvey, em Mansfield.Considering the importance of significations in literary works, this paper proposes a comparative study of the image of the “Doll’s House” in Henrik Ibsen’s play A Doll’s House (1879, and Katherine Mansfield’s short story “The Doll’s House”, published in the book The Dove’s Nest (1923, based on the theories of Gaston Bachelard and Jean Baudrillard. In both cases, one notices that the presence of this image indicates not only the construction of these works’ environment, but also a criticism of the bourgeois model of a perfect and flawless society, as the described image refers to. However, even though this image shares the same idea in both works, it will be explored differently in each case, whether through the search of Nora’s character in escaping social conformity as in Ibsen, or through the subtle childlike game experienced by the Kelvey sisters, as in Mansfield.

  8. Confirming and Improving Ross Variable Star RV Del

    Science.gov (United States)

    Linder, Tyler R.; Sanchez, Rick; Palser, Sage; Schultze, Kendra; Kenney, Jessica; Thompson, Briana; DeCoster, Richard; Mills, Frank; Osborn, Wayne; Hoette, Vivian L.; Skynet Junior Scholars; Stone Edge Observatory

    2017-01-01

    RV Del is an intrinsic pulsating variable star in the constellation Delphinus, discovered by Ross (1926). The AAVSO list RV Del as a RRAB type of variable star. RV Del has been found to have a magnitude that varies from 12.9 - 14.2 and a period of 11.9553 hours.The purpose of our research of RV Del is to confirm and improve previous results as well as explore different methods to engage middle school students in the scientific method and astronomy. The SKYNET network of telescopes allows students to request images from a group of international research class telescopes. The telescope request process allows students first-hand experience in astronomy while the data analysis allows students to understand advance software systems to produce publishable results. Data is being gathered using the SKYNET network and Stone Edge Observatory to gather photometry of RV Del and create a new light curve. Findings will be presented the January 2017 AAS.

  9. Ghost Stories: Review of Ross Gibson's The Summer Exercises

    Directory of Open Access Journals (Sweden)

    Deane Williams

    2010-03-01

    Full Text Available Back 
in 
1986, 
Ross 
Gibson
 was 
interviewed 
in
 Filmnews 
by
 Adrian
 Martin 
and
Tina
 Kaufman
 about
 his
 experimental
 short
 essay
 film
 Camera
 Natura
 (1984. Accompanying
 that
 interview
 was
 a
 photo
 of
 Gibson
 ‘on
 location’
 for
 his
 film,
 wearing
 a
 hat
 not
 unlike
 the
 one
 that
 features
 on
 the
 cover
 of
 his
 new
 book
 The
 Summer 
Exercises.
 Back 
then
 I
 understood
 the 
hat
 to 
be
 an
explorer’s,
 someone 
like
 Charles
 Sturt,
 someone
 whose
 willingness
 to
 learn
 from
 his
 environment
 had
 impressed
 Gibson
 in
 fashioning
 his
 own
 history
 of
 Australian
 landscape
 imaging.
 Now
 the
 hat
 looks
 like
 a
 detective’s
 or,
 rather,
 Marcel
 Duchamp’s
 rendering
 of
 a
 detective’s
 hat: 
on 
display,
 ready 
for
 our
 re‐consideration.

  10. Uma releitura da obra de Elisabeth Kubler-Ross

    Directory of Open Access Journals (Sweden)

    Selene Beviláqua Chaves Afonso

    2013-09-01

    Full Text Available Este artigo apresenta uma releitura de parte da obra de Elizabeth Ross, uma das autoras mais citadas sobre a questão da terminalidade da vida, do luto e do morrer. Sua obra tem sido de grande contribuição tanto para os profissionais de saúde como para pais, mães, filhos, parentes, leigos e religiosos que vivenciam o luto. Também tem sido alvo de controvérsias relacionadas a questões éticas e quanto a seu rigor científico. Os livros aqui comentados são: On death and dying (Sobre A morte e o morrer, de 1969; Questions and answers on death and dying (Perguntas e respostas sobre a morte e o morrer, de 1971; Living with death and dying(Vivendo com a morte e os moribundos, de 1981; On children and death (Sobre as crianças e a morte, de 1983; On life after death (Sobre a vida depois da morte, de 1991 e Life lessons (Lições de vida, de 2000.

  11. 波特小说中的《圣经》原型%A Biblical Archetypal Approach to Katherine Anne Porter's Stories

    Institute of Scientific and Technical Information of China (English)

    张莹波

    2011-01-01

    《圣经》在世界文学史上有着极为重要的地位,对西方文化的影响源远流长。当代美国南方文学的重要代表凯瑟琳·安·波特深受《圣经》神话的影响,其小说征引了丰富的《圣经》原型、典故、意象和象征。文章依据诺斯洛普·弗莱的原型批评理论从原型场景、原型人物、原型结构与主题、原型意象和象征等方面分析出现在波特多部中短篇小说中的《圣经》原型,指出她对《圣经》原型有直接引用和间接的创造性"置换变形"或"魔幻变调",说明她借助如此多的原型旨在清晰地透视她笔下人物的精神现状和心灵世界,描绘精神生活的多样图景,从而表现她作为小说家对人性、对社会、对个体生命的精神生态乃至整个人类命运的哲理思考。%It is known that The Holy Bible has exerted an indispensable and lingering influence on the Western culture and the world literature.Katherine Anne Porter,a representative of contemporary American Southern literature is so deeply influenced by the Bible literature that most of her stories are rich with Biblical archetypes,allusions,images and symbols.From the perspective of Frye's Literary Criticism of Archetypes,the paper analyzes the Biblical archetypal situations,characters,structures and themes,images and symbols Porter directly borrows and indirectly "displaces or modulates" to reveal her creative purposes.Porter aims to X-ray the spiritual world of her character,and to express her philosophical contemplation of humanity,spiritual ecology,and the future of human society as well.

  12. Transcatheter Pulmonary Valve Replacement for Right Ventricular Outflow Tract Conduit Dysfunction After the Ross Procedure

    DEFF Research Database (Denmark)

    Gillespie, Matthew J; McElhinney, Doff B; Kreutzer, Jacqueline

    2015-01-01

    BACKGROUND: Right ventricular outflow tract (RVOT) conduit dysfunction is a limitation of the Ross procedure. Transcatheter pulmonary valve replacement (TPVR) could alter the impact of conduit dysfunction and the risk-benefit balance for the Ross procedure. METHODS: Retrospective review of databa...... early outcomes and durable valve function in the majority of Ross patients. Recurrent RVOT obstruction associated with stent fracture was the main reason for reintervention. Coronary compression is not uncommon in Ross patients and should be assessed prior to TPVR....... of databases from 3 prospective Melody TPV (Medtronic Inc, Minneapolis, MN) trials. RESULTS: Among 358 patients who were catheterized with the intent to implant a Melody TPV for RVOT conduit stenosis or regurgitation (PR) as part of 3 prospective multicenter studies, 67 (19%) had a prior Ross procedure....... Of these, 56 (84%) received a Melody valve; in 5 of the 11 patients who did not, the implant was aborted due to concern for coronary artery compression, and 1 implanted patient required emergent surgery for left coronary compression. The RVOT gradient decreased from a median 38 mm Hg to 13.5 mm Hg (p

  13. 凯瑟琳·曼斯菲尔德《大风吹》中的叙事聚焦研究%Focalization in Katherine Mansfield's "The Wind Blows"

    Institute of Scientific and Technical Information of China (English)

    银洁

    2012-01-01

    Katherine Mansfield is a famous British short story writer in the twentieth century and her contribution mainly lies in the dedicate use of modern narrative techniques, such as focalization. Based on Genette's narratology theory, this paper analyzes the focalization in "The Wind Blows" of Katherine Mansfield and reveals the inner relation between focalization and character and theme.%凯瑟琳·曼斯菲尔德是英国二十世纪著名的短篇小说家,她对短篇小说发展的突出贡献主要体现在现代主义叙事技巧的巧妙运用,比如聚焦。本文以热奈特的叙事理论为基础,对凯瑟琳·曼斯菲尔德的短篇小说《大风吹》的叙事聚焦进行探究,旨在揭示聚焦与人物及主题的内在关系。

  14. Paleobathymetric Reconstruction of Ross Sea: seismic data processing and regional reflectors mapping

    Science.gov (United States)

    Olivo, Elisabetta; De Santis, Laura; Wardell, Nigel; Geletti, Riccardo; Busetti, Martina; Sauli, Chiara; Bergamasco, Andrea; Colleoni, Florence; Vanzella, Walter; Sorlien, Christopher; Wilson, Doug; De Conto, Robert; Powell, Ross; Bart, Phil; Luyendyk, Bruce

    2017-04-01

    PURPOSE: New maps of some major unconformities of the Ross Sea have been reconstructed, by using seismic data grids, combined with the acoustic velocities from previous works, from new and reprocessed seismic profiles. This work is carried out with the support of PNRA and in the frame of the bilateral Italy-USA project GLAISS (Global Sea Level Rise & Antarctic Ice Sheet Stability predictions), funded by the Ministry of Foreign Affairs. Paleobathymetric maps of 30, 14 and 4 million years ago, three 'key moments' for the glacial history of the Antarctic Ice Sheet, coinciding with global climatic changes. The paleobathymetric maps will then be used for numeric simulations focused on the width and thickness of the Ross Sea Ice Sheet. PRELIMINARY RESULTS: The first step was to create TWT maps of three main unconformity (RSU6, RSU4, and RSU2) of Ross Sea, revisiting and updating the ANTOSTRAT maps, through the interpretation of sedimentary bodies and erosional features, used to infer active or old processes along the slope, we identified the main seismic unconformities. We used the HIS Kingdom academic license. The different groups contribution was on the analysis of the Eastern Ross Sea continental slope and rise (OGS), of the Central Basin (KOPRI) of the western and central Ross Sea (Univ. of Santa Barbara and OGS), where new drill sites and seismic profiles were collected after the publication of the ANTOSTRAT maps. Than we joined our interpretation with previous interpretations. We examined previous processing of several seismic lines and all the old acoustic velocity analysis. In addiction we reprocessed some lines in order to have a higher data coverage. Then, combining the TWT maps of the unconformity with the old and new speed data we created new depth maps of the study area. The new depth maps will then be used for reconstructing the paleobathymetry of the Ross Sea by applying backstripping technique.

  15. Identifying the role of reactive oxygen species (ROSs) in Fusarium solani spores inactivation.

    Science.gov (United States)

    Du, Yilin; Xiong, Houfeng; Dong, Shuangshi; Zhang, Jun; Ma, Dongmei; Zhou, Dandan

    2016-12-01

    The inactivation mechanism of photocatalytic disinfectants on bacteria is well known. In contrast, the potential inactivation of fungal spores by visible-light induced photocatalysis has been recognized, but the inactivation mechanism is poorly understood. We hypothesize that photocatalytically generated reactive oxygen species (ROSs) are directly involved in this mechanism. To test this hypothesis, we identified the roles of ROSs in the inactivation of Fusarium solani spores. As the photocatalysts, we doped TiO2 with 3 typical dopants, forming Ag/TiO2, N/TiO2 and Er(3+):YAlO3/TiO2. The Ag/TiO2 photocatalysis was dominated by H2O2, with the longest lifetime among the investigated ROSs. Ag/TiO2 photocatalysis yielded almost 100 % inactivation efficiency and preserved the cell-wall shape of the spores, thus minimizing the biomolecule leakage. Er(3+):YAlO3/TiO2 was dominated by h(+) ROSs, yielding an inactivation efficiency of 91 %; however, the severe leakage released large numbers of molecular bio-products. Severe damage to the cell walls by the h(+) species was confirmed in micrograph observations. Subsequent to cell wall breakage, the Er(3+):YAlO3/TiO2 nanoparticles entered the spore cells and directly oxidized the intracellular material. The N/TiO2 photocatalysis, with •O2(-) dominated ROSs, delivered intermediate performance. In conclusion, photocatalysts that generate H2O2-dominated ROSs are most preferred for spore inactivation.

  16. 78 FR 12357 - Brockway Mould, Inc., a Division of Ross International Ltd. Including Robert Lerch From BJR...

    Science.gov (United States)

    2013-02-22

    ... Employment and Training Administration Brockway Mould, Inc., a Division of Ross International Ltd. Including... Brockway Mould, Inc., a division of Ross International Ltd, Brockport, Pennsylvania (subject firm). The...,862 is hereby issued as follows: ``All workers from Brockway Mould, Inc., a division of...

  17. Lesser snow geese and ross's geese form mixed flocks during winter but differ in family maintenance and social status

    Science.gov (United States)

    Jonsson, J.E.; Afton, A.D.

    2008-01-01

    Smaller species are less likely to maintain families (or other forms of social groups) than larger species and are more likely to be displaced in competition with larger species. We observed mixed-species flocks of geese in southwest Louisiana and compared frequencies of social groups and success in social encounters of Lesser Snow Geese (Chen caerulescens caerulescens; hereafter Snow Geese) with that of the smaller, closely- related Ross's Geese (C. rossii). Less than 7% of adult and social encounters and had higher odds of success against Ross's Geese than against individuals of their own species. The larger Snow Geese maintain families longer than Ross's Geese, which probably contributes to their dominance over Ross's Geese during winter. Predator vigilance probably is an important benefit of mixed flocking for both species. We suggest the long-standing association with Snow Geese (along with associated subordinate social status) has selected against family maintenance in Ross's Geese.

  18. Floquet-Bloch vs. Nicolson-Ross-Weir Extraction for Magneto-Dielectric Bragg Stacks

    DEFF Research Database (Denmark)

    Clausen, Niels Christian Jerichau; Arslanagic, Samel; Breinbjerg, Olav

    2014-01-01

    We extract and compare the permittivity and permeability from a dielectric and a magnetodielectric Bragg stack with the Floquet-Bloch (FB) method for the infinite stack and the Nicolson-Ross- Weir (NRW) method for the finite stack. While the extracted propagation constants are identical, the wave...

  19. First stage of INTRAMAP: INtegrated Transantarctic Mountains and Ross Sea Area Magnetic Anomaly Project

    Directory of Open Access Journals (Sweden)

    D. Damaske

    1999-06-01

    Full Text Available INTRAMAP (INtegrated Transantarctic Mountains and Ross Sea Area Magnetic Anomaly Project is an international effort to merge the magnetic data acquired throughout the "Ross Sea Antarctic Sector" (south of 60°S between 135°-255°E including the Transantarctic Mountains (TAM, the Ross Sea, Marie Byrd Land, and the Pacific coast, and also to begin the compilation efforts for new data over the Wilkes Basin. This project is a component of the continental scale Antarctic Digital Magnetic Anomaly Project (ADMAP. The first stage of INTRAMAP addresses the analysis and merging of GITARA (1991-1994 and GANOVEX (1984 aeromagnetic surveys together with ground magnetic data (1984-1989. The combined data sets cover an area of approximately 30 km2 over Victoria Land and adjacent Ross Sea. Map and profile gridding were implemented to integrate the data sets. These approaches are studied for improving existing strategies to adopt for the whole magnetic compilation effort. The final microlevelled grid that we produce is a new tool for regional interpretation of the main tectonic and geologic features of this sector of Antarctica.

  20. Ross procedure in a child with Aspergillus endocarditis and bicuspid aortic valve.

    Science.gov (United States)

    Mitropoulos, Fotios A; Kanakis, Meletios A; Contrafouris, Constantinos; Laskari, Cleo; Rammos, Spyridon; Apostolidis, Christos; Azariadis, Prodromos; Chatzis, Andrew C

    2014-08-23

    The case is presented of a previously healthy infant with a known asymptomatic bicuspid aortic valve who developed fungal endocarditis. The patient underwent aortic root replacement with a pulmonary autograft (Ross procedure). Cultured operative material revealed Aspergillus infection. The patient had an excellent recovery and remained well one year later.

  1. Ross river virus disease in two Dutch travelers returning from Australia, February to April 2015

    NARCIS (Netherlands)

    C.B.E.M. Reusken (Chantal); N.B. Cleton (Natalie); M.M. Melo (M. Medonça); C. Visser; C.G. Van Kessel (C. Geurts); P. Bloembergen; M.P.G. Koopmans D.V.M. (Marion); J. Schmidt-Chanasit (Jonas); P. van Genderen

    2015-01-01

    textabstractWe report two cases of Ross River virus (RRV) infection in Dutch travellers who visited Australia during February to April 2015. These cases coincided with the largest recorded outbreak of RRV disease in Australia since 1996. This report serves to create awareness among physicians to

  2. Ross River virus disease in two Dutch travellers returning from Australia, February to April 2015

    NARCIS (Netherlands)

    C.B.E.M. Reusken (Chantal); N.B. Cleton (Natalie); M. Medonça Melo; C. Visser; C.H. Geurts van Kessel (Corine); P. Bloembergen; M.P.G. Koopmans D.V.M. (Marion); J. Schmidt-Chanasit (Jonas); P. van Genderen

    2015-01-01

    textabstractWe report two cases of Ross River virus (RRV) infection in Dutch travellers who visited Australia during February to April 2015. These cases coincided with the largest recorded outbreak of RRV disease in Australia since 1996. This report serves to create awareness among physicians to

  3. Sources of iron in the Ross Sea Polynya in early summer

    NARCIS (Netherlands)

    Gerringa, L. J. A.; Laan, P.; van Dijken, G. L.; van Haren, H.; De Baar, H. J. W.; Arrigo, K. R.; Alderkamp, A. -C.

    2015-01-01

    Dissolved Fe (DFe) was measured in the Ross Sea Polynya (RSP), Antarctica, during a GEOTRACES cruise between 20 December 2013 and 5 January 2014. DFe was measured over the full water column with special emphasis on samples near the seafloor. In the upper mixed layer, DFe was very low everywhere (

  4. TEST OF THE CHEN-ROLL-ROSS MACROECONOMIC FACTOR MODEL: EVIDENCE FROM CROATIAN STOCK MARKET

    Directory of Open Access Journals (Sweden)

    Denis Dolinar

    2015-12-01

    Full Text Available This paper empirically examines the well-known Chen-Roll-Ross model on the Croatian stock market. Modifications of definitions of the Chen-Roll-Ross model variables showed as necessary because of doubtful availability and quality of input data needed. Namely, some macroeconomic and market variables are not available in the originally defined form or do not exist. In that sense this paper gives some alternative definitions for some model variables. Also, in order to improve statistical analysis, in this paper we have modified Fama-MacBeth technique in the way that second-pass regression was substituted with panel regression analysis. Based on the two-pass regression analysis of returns of 34 Croatian stocks on 4 macroeconomic variables during the seven-and-half-year observation period the following conclusion is made. In contrast to the results of Chen, Roll and Ross (1986 for the U.S. stock market, their model is not successful when describing a risk-return relation of Croatian stocks. Nevertheless, one observed version of the Chen-RollRoss model showed certain statistical significance. Namely, two risk factors in that version of the model were statistically significant: default premium, measured as risk premium for the corporate short-term bank loan financing, and term structure premium, measured on short-run basis.

  5. STS-37 Mission Specialist (MS) Ross during simulation in JSC's FB-SMS

    Science.gov (United States)

    1991-01-01

    STS-37 Mission Specialist (MS) Jerry L. Ross 'borrows' the pilots station to rehearse some of his scheduled duties for his upcoming mission. He is on the flight deck of the fixed-based (FB) shuttle mission simulator (SMS) during this unsuited simulation. The SMS is part of JSC's Mission Simulation and Training Facility Bldg 5.

  6. Distribution and ventilation of water masses in the western Ross Sea inferred from CFC measurements

    Science.gov (United States)

    Rivaro, Paola; Ianni, Carmela; Magi, Emanuele; Massolo, Serena; Budillon, Giorgio; Smethie, William M.

    2015-03-01

    During the CLIMA Project (R.V. Italica cruise PNRA XVI, January-February 2001), hydrographic and chlorofluorocarbons (CFCs) observations were obtained, particularly in the western Ross Sea. Their distribution demonstrated water mass structure and ventilation processes in the investigated areas. In the surface waters (AASW) the CFC saturation levels varied spatially: CFCs were undersaturated in all the areas (range from 80 to 90%), with the exception of few stations sampled near Ross Island. In particular, the Terra Nova Bay polynya, where high salinity shelf water (HSSW) is produced, was a low-saturated surface area (74%) with respect to CFCs. Throughout most of the shelf area, the presence of modified circumpolar deep water (MCDW) was reflected in a mid-depth CFC concentration minima. Beneath the MCDW, CFC concentrations generally increased in the shelf waters towards the seafloor. We estimated that the corresponding CFCs saturation level in the source water region for HSSW was about 68-70%. Waters with high CFC concentrations were detected in the western Ross Sea on the down slope side of the Drygalski Trough, indicating that AABW was being supplied to the deep Antarctic Basin. Estimates of ventilation ages depend strongly on the saturation levels. We calculated ventilation ages using the saturation level calibrated tracer ratio, CFC11/CFC12. We deduced a mean residence time of the shelf waters of about 6-7 years between the western Ross Sea source and the shelf break.

  7. Märten Ross sõnastas majanduskriisi õppetunnid / Argo Ideon

    Index Scriptorium Estoniae

    Ideon, Argo, 1966-

    2011-01-01

    Ajutiselt peaministri majandus- ja rahandusnõunikuna töötanud endine Eesti Panga asepresident Märten Ross kirjutas loetelu õppetundidest, mida Eesti majanduspoliitika peaks arvestama 2008.-2009. aasta kriisi põhjal. Rossi 10 punkti lühidalt. Rahandusminister Jürgen Ligi ning Eesti Panga rahapoliitika ja majandusuuringute osakonna asejuhataja Martin Lindpere arvamus

  8. A Helping Hand in the Frederick Community—Ross Smith | Poster

    Science.gov (United States)

    By day, Ross Smith is the compliance and security officer for Data Management Services, Inc., assigned to the National Cancer Institute (NCI) at Frederick. His role is to ensure the secure operation of in-house computer systems, servers, and network connections. But in his spare time, Smith is also a volunteer firefighter and emergency medical technician (EMT).

  9. Astronauts Ross and Helms at CAPCOM station during STS-61 simulations

    Science.gov (United States)

    1993-01-01

    Astronauts Jerry L. Ross and Susan J. Helms are pictured at the Spacecraft Communicators console during joint integrated simulations for the STS-61 mission. Astronauts assigned to extravehicular activity (EVA) tasks with the Hubble Space Telescope (HST) were simultaneously rehearsing in a neutral buoyancy tank at the Marshall Space Flight Center (MSFC) in Alabama.

  10. Temporal progression of photosynthetic-strategy in phytoplankton in the Ross Sea, Antarctica

    Science.gov (United States)

    Ryan-Keogh, Thomas J.; DeLizo, Liza M.; Smith, Walker O.; Sedwick, Peter N.; McGillicuddy, Dennis J.; Moore, C. Mark; Bibby, Thomas S.

    2017-02-01

    The bioavailability of iron influences the distribution, biomass and productivity of phytoplankton in the Ross Sea, one of the most productive regions in the Southern Ocean. We mapped the spatial and temporal extent and severity of iron-limitation of the native phytoplankton assemblage using long- (> 24 h) and short-term (24 h) iron-addition experiments along with physiological and molecular characterisations during a cruise to the Ross Sea in December-February 2012. Phytoplankton increased their photosynthetic efficiency in response to iron addition, suggesting proximal iron limitation throughout most of the Ross Sea during summer. Molecular and physiological data further indicate that as nitrate is removed from the surface ocean the phytoplankton community transitions to one displaying an iron-efficient photosynthetic strategy characterised by an increase in the size of photosystem II (PSII) photochemical cross section (σPSII) and a decrease in the chlorophyll-normalised PSII abundance. These results suggest that phytoplankton with the ability to reduce their photosynthetic iron requirements are selected as the growing season progresses, which may drive the well-documented progression from Phaeocystis antarctica- assemblages to diatom-dominated phytoplankton. Such a shift in the assemblage-level photosynthetic strategy potentially mediates further drawdown of nitrate following the development of iron deficient conditions in the Ross Sea.

  11. Sources of iron in the Ross Sea Polynya in early summer

    NARCIS (Netherlands)

    Gerringa, L.J.A.; Laan, P.; van Dijken, G.L.; van Haren, H.; de Baar, H.J.W.; Arrigo, K.R.; Alderkamp, A.-C.

    2015-01-01

    Dissolved Fe (DFe) was measured in the Ross Sea Polynya (RSP), Antarctica, during a GEOTRACES cruise between 20 December 2013 and 5 January 2014. DFe was measured over the full water column with special emphasis on samples near the seafloor. In the upper mixed layer, DFe was very low everywhere (< 0

  12. Photographer: Digital Telepresence: Dr Murial Ross's Virtual Reality Application for Neuroscience

    Science.gov (United States)

    1995-01-01

    Photographer: Digital Telepresence: Dr Murial Ross's Virtual Reality Application for Neuroscience Research Biocomputation. To study human disorders of balance and space motion sickness. Shown here is a 3D reconstruction of a nerve ending in inner ear, nature's wiring of balance organs.

  13. Sources of iron in the Ross Sea Polynya in early summer

    NARCIS (Netherlands)

    Gerringa, L. J. A.; Laan, P.; van Dijken, G. L.; van Haren, H.; De Baar, H. J. W.; Arrigo, K. R.; Alderkamp, A. -C.

    2015-01-01

    Dissolved Fe (DFe) was measured in the Ross Sea Polynya (RSP), Antarctica, during a GEOTRACES cruise between 20 December 2013 and 5 January 2014. DFe was measured over the full water column with special emphasis on samples near the seafloor. In the upper mixed layer, DFe was very low everywhere (

  14. A Q-Methodological Study of the Kubler-Ross Stage Theory.

    Science.gov (United States)

    Metzger, Anne M.

    1979-01-01

    Investigated the correspondence between stage changes hypothesized by the Kubler-Ross theory and the perception of the course of illness by seriously ill patients and their spouses. Supported the use of Q-methodology as a research procedure for investigations of terminal illness. (Author)

  15. Overflow dynamics and bottom water formation in the western Ross Sea: Influence of tides

    Science.gov (United States)

    Wang, Q.; Danilov, S.; Hellmer, H. H.; SchröTer, J.

    2010-10-01

    The tidal impact on overflow dynamics and bottom water production in the western Ross Sea is studied with the Finite Element Ocean Model, which allows embedding a mesh with 0.5 km resolution in a coarse resolution (30 km) setup without nesting. The simulated overflow properties inside and downstream of the western Ross Sea are described. The overflow exhibits pronounced variability at both daily and spring-neap tidal time scales in the western Ross Sea. Tides increase mixing over both the outer shelf and upper slope there. Plume jets are shaped by tidal currents at a bathymetric bend west of the Drygalski Trough mouth, descending rapidly and supplying the bottom water. A fraction of shelf water remains over the shelf and propagates westward from the Ross Sea, but it does not contribute significantly to bottom water formation because of energetic mixing over the upper slope. Compared to a simulation without tidal forcing, tides (with the major K1 and O1 constituents) increase the outflow rate over the continental slope off Cape Adare by about 70%. A set of sensitivity experiments show that the rate of bottom water production is not a monotonic function of the tidal currents amplitude. Tidal forcing with intermediate strength leads to the most efficient bottom water formation.

  16. Assessing competition with the Panzar-Rosse model : the role of scale, costs, and equilibrium

    NARCIS (Netherlands)

    Bikker, Jacob A.; Shaffer, Sherrill; Spierdijk, Laura

    2012-01-01

    The Panzar-Rosse test has been widely applied to assess competitive conduct, often in specifications controlling for firm scale or using a price equation. We show that neither a price equation nor a scaled revenue function yields a valid measure for competitive conduct. Moreover, even an unscaled re

  17. Atmospheric forcing of sea ice anomalies in the Ross Sea polynya region

    Science.gov (United States)

    Dale, Ethan R.; McDonald, Adrian J.; Coggins, Jack H. J.; Rack, Wolfgang

    2017-01-01

    We investigate the impacts of strong wind events on the sea ice concentration within the Ross Sea polynya (RSP), which may have consequences on sea ice formation. Bootstrap sea ice concentration (SIC) measurements derived from satellite SSM/I brightness temperatures are correlated with surface winds and temperatures from Ross Ice Shelf automatic weather stations (AWSs) and weather models (ERA-Interim). Daily data in the austral winter period were used to classify characteristic weather regimes based on the percentiles of wind speed. For each regime a composite of a SIC anomaly was formed for the entire Ross Sea region and we found that persistent weak winds near the edge of the Ross Ice Shelf are generally associated with positive SIC anomalies in the Ross Sea polynya and vice versa. By analyzing sea ice motion vectors derived from the SSM/I brightness temperatures we find significant sea ice motion anomalies throughout the Ross Sea during strong wind events, which persist for several days after a strong wind event has ended. Strong, negative correlations are found between SIC and AWS wind speed within the RSP indicating that strong winds cause significant advection of sea ice in the region. We were able to partially recreate these correlations using colocated, modeled ERA-Interim wind speeds. However, large AWS and model differences are observed in the vicinity of Ross Island, where ERA-Interim underestimates wind speeds by a factor of 1.7 resulting in a significant misrepresentation of RSP processes in this area based on model data. Thus, the cross-correlation functions produced by compositing based on ERA-Interim wind speeds differed significantly from those produced with AWS wind speeds. In general the rapid decrease in SIC during a strong wind event is followed by a more gradual recovery in SIC. The SIC recovery continues over a time period greater than the average persistence of strong wind events and sea ice motion anomalies. This suggests that sea ice

  18. Coastal-change and glaciological map of the Ross Island area, Antarctica

    Science.gov (United States)

    Ferrigno, Jane G.; Foley, Kevin M.; Swithinbank, Charles; Williams, Richard S.

    2010-01-01

    Reduction in the area and volume of Earth?s two polar ice sheets is intricately linked to changes in global climate and to the resulting rise in sea level. Measurement of changes in area and mass balance of the Antarctic ice sheet was given a very high priority in recommendations by the Polar Research Board of the National Research Council. On the basis of these recommendations, the U.S. Geological Survey used its archive of satellite images to document changes in the cryospheric coastline of Antarctica and analyze the glaciological features of the coastal regions. The Ross Island area map is bounded by long 141? E. and 175? E. and by lat 76? S. and 81? S. The map covers the part of southern Victoria Land that includes the northwestern Ross Ice Shelf, the McMurdo Ice Shelf, part of the polar plateau and Transantarctic Mountains, the McMurdo Dry Valleys, northernmost Shackleton Coast, Hillary Coast, the southern part of Scott Coast, and Ross Island. Little noticeable change has occurred in the ice fronts on the map, so the focus is on glaciological features. In the western part of the map area, the polar plateau of East Antarctica, once thought to be a featureless region, has subtle wavelike surface forms (megadunes) and flow traces of glaciers that originate far inland and extend to the coast or into the Ross Ice Shelf. There are numerous outlet glaciers. Glaciers drain into the McMurdo Dry Valleys, through the Transantarctic Mountains into the Ross Sea, or into the Ross Ice Shelf. Byrd Glacier is the largest. West of the Transantarctic Mountains are areas of blue ice, readily identifiable on Landsat images, that have been determined to be prime areas for finding meteorites. Three subglacial lakes have been identified in the map area. Because McMurdo Station, the main U.S. scientific research station in Antarctica, is located on Ross Island in the map area, many of these and other features in the area have been studied extensively. The paper version of this map is

  19. Widespread collapse of the Ross Ice Shelf during the late Holocene.

    Science.gov (United States)

    Yokoyama, Yusuke; Anderson, John B; Yamane, Masako; Simkins, Lauren M; Miyairi, Yosuke; Yamazaki, Takahiro; Koizumi, Mamito; Suga, Hisami; Kusahara, Kazuya; Prothro, Lindsay; Hasumi, Hiroyasu; Southon, John R; Ohkouchi, Naohiko

    2016-03-01

    The stability of modern ice shelves is threatened by atmospheric and oceanic warming. The geologic record of formerly glaciated continental shelves provides a window into the past of how ice shelves responded to a warming climate. Fields of deep (-560 m), linear iceberg furrows on the outer, western Ross Sea continental shelf record an early post-Last Glacial Maximum episode of ice-shelf collapse that was followed by continuous retreat of the grounding line for ∼200 km. Runaway grounding line conditions culminated once the ice became pinned on shallow banks in the western Ross Sea. This early episode of ice-shelf collapse is not observed in the eastern Ross Sea, where more episodic grounding line retreat took place. More widespread (∼280,000 km(2)) retreat of the ancestral Ross Ice Shelf occurred during the late Holocene. This event is recorded in sediment cores by a shift from terrigenous glacimarine mud to diatomaceous open-marine sediment as well as an increase in radiogenic beryllium ((10)Be) concentrations. The timing of ice-shelf breakup is constrained by compound specific radiocarbon ages, the first application of this technique systematically applied to Antarctic marine sediments. Breakup initiated around 5 ka, with the ice shelf reaching its current configuration ∼1.5 ka. In the eastern Ross Sea, the ice shelf retreated up to 100 km in about a thousand years. Three-dimensional thermodynamic ice-shelf/ocean modeling results and comparison with ice-core records indicate that ice-shelf breakup resulted from combined atmospheric warming and warm ocean currents impinging onto the continental shelf.

  20. Improved Bathymetry Resolution in the Ross Sea from Aerogravity and Magnetics: Examples from Operation IceBridge.

    Science.gov (United States)

    Tinto, K. J.; Cochran, J. R.; Bell, R. E.; Charles, K.; Burton, B.

    2014-12-01

    The Ross Ice Shelf, located in the embayment between East and West Antarctica, is one of the largest underexplored patches of ocean on the planet. Sediment cores show that the Ross Ice Shelf can disintegrate during some interglacial periods. The conditions required for sudden collapse are not well constrained. A key to understanding the dynamics and long-term stability of the Ross Ice Shelf system is having high-resolution constraints on its boundary conditions, including sea floor bathymetry. The sea floor under the Ross Ice Shelf has developed in response to both the tectonic development of the West Antarctic Rift and the glacial signature of the waxing and waning Antarctic Ice Sheets. A mixture of fabrics and orientations in its bathymetry reflect this complex development. However, present oceanographic models of water circulation under the ice are based on low-resolution bathymetric maps drawn from stations spaced 55 km apart obtained during the RIGGS project in the 1970s. In contrast, most of the bathymetry of the world's oceans has been mapped to approximately 15 km resolution from satellite altimetry and much higher resolution from acoustic surveys. Improvement of Ross Ice Shelf bathymetry can be achieved from combined analysis and inversion of gravity and magnetic data acquired from airborne surveys over the Ross Ice Shelf. Survey lines flown in 2013 by Operation IceBridge, with the Sander Geophysics Ltd AIRGrav system over the central and northern Ross Embayment provide a tenfold increase, to 5 km, of the along track resolution of bathymetry. Newly resolved bathymetric highs and lows have amplitudes of up to 200 km. Combining the gravity and magnetic surveys also reveals the differing geology across the embayment. Results from these surveys, including comparison with ship-based bathymetry data from the Ross Sea, demonstrate the value of gravity and magnetic surveys for mapping the bathymetry of the Ross Ice Shelf and the need for more comprehensive

  1. Experiencia a largo plazo con la operación de Ross en pacientes pediátricos

    Directory of Open Access Journals (Sweden)

    José M. Caffarena Calvar

    2008-07-01

    Conclusions: The Ross and Ross-Konno operations have changed the prognosis of pediatric patients with complex disease of the valve and aortic root. There is growth of the neo-aortic root in young patients. Sinotubular dilatation of the autograft with neoaortic valve insufficiency has been detected in patients with previously dilated aortic root when root replacement technique was performed. The best results are obtained in the younger andlower weight patients with complex left ventricular outflow obstruction without root dilatation. A close follow-up of patients with aortic root dilatation is mandatory to definitely validate the Ross procedure over aortic prosthesis.

  2. The Satellite Passive-Microwave Record of Sea Ice in the Ross Sea Since Late 1978

    Science.gov (United States)

    Parkinson, Claire L.

    2009-01-01

    Satellites have provided us with a remarkable ability to monitor many aspects of the globe day-in and day-out and sea ice is one of numerous variables that by now have quite substantial satellite records. Passive-microwave data have been particularly valuable in sea ice monitoring, with a record that extends back to August 1987 on daily basis (for most of the period), to November 1970 on a less complete basis (again for most of the period), and to December 1972 on a less complete basis. For the period since November 1970, Ross Sea sea ice imagery is available at spatial resolution of approximately 25 km. This allows good depictions of the seasonal advance and retreat of the ice cover each year, along with its marked interannual variability. The Ross Sea ice extent typically reaches a minimum of approximately 0.7 x 10(exp 6) square kilometers in February, rising to a maximum of approximately 4.0 x 10(exp 6) square kilometers in September, with much variability among years for both those numbers. The Ross Sea images show clearly the day-by-day activity greatly from year to year. Animations of the data help to highlight the dynamic nature of the Ross Sea ice cover. The satellite data also allow calculation of trends in the ice cover over the period of the satellite record. Using linear least-squares fits, the Ross Sea ice extent increased at an average rate of 12,600 plus or minus 1,800 square kilometers per year between November 1978 and December 2007, with every month exhibiting increased ice extent and the rates of increase ranging from a low of 7,500 plus or minus 5,000 square kilometers per year for the February ice extents to a high of 20,300 plus or minus 6,100 kilometers per year for the October ice extents. On a yearly average basis, for 1979-2007 the Ross Sea ice extent increased at a rate of 4.8 plus or minus 1.6 % per decade. Placing the Ross Sea in the context of the Southern Ocean as a whole, over the November 1978-December 2007 period the Ross Sea had

  3. Miocene Antarctic ice dynamics in the Ross Embayment (Western Ross Sea, Antarctica): Insights from provenance analyses of sedimentary clasts in the AND-2A drill core

    Science.gov (United States)

    Cornamusini, Gianluca; Talarico, Franco M.

    2016-11-01

    A detailed study of gravel-size sedimentary clasts in the ANDRILL-2A (AND-2A) drill core reveals distinct changes in provenance and allows reconstructions to be produced of the paleo ice flow in the McMurdo Sound region (Ross Sea) from the Early Miocene to the Holocene. The sedimentary clasts in AND-2A are divided into seven distinct petrofacies. A comparison of these with potential source rocks from the Transantarctic Mountains and the coastal Southern Victoria Land suggests that the majority of the sedimentary clasts were derived from formations within the Devonian-Triassic Beacon Supergroup. The siliciclastic-carbonate petrofacies are similar to the fossiliferous erratics found in the Quaternary Moraine in the southern McMurdo Sound and were probably sourced from Eocene strata that are currently hidden beneath the Ross Ice Shelf. Intraformational clasts were almost certainly reworked from diamictite and mudstone sequences that were originally deposited proximal to the drill site. The distribution of sedimentary gravel clasts in AND-2A suggests that sedimentary sequences in the drill core were deposited under two main glacial scenarios: 1) a highly dynamic ice sheet that did not extend beyond the coastal margin and produced abundant debris-rich icebergs from outlet glaciers in the central Transantarctic Mountains and South Victoria Land; 2) and an ice sheet that extended well beyond the coastal margin and periodically advanced across the Ross Embayment. Glacial scenario 1 dominated the early to mid-Miocene (between ca. 1000 and 225 mbsf in AND-2A) and scenario 2 the early Miocene (between ca. 1138 and 1000 mbsf) and late Neogene to Holocene (above ca. 225 mbsf). This study augments previous research on the clast provenance and highlights the added value that sedimentary clasts offer in terms of reconstructing past glacial conditions from Antarctic drill core records.

  4. Physical, chemical, and biological data collected during two research cruises in the Ross Sea, Antarctica from December 2004 to January 2005 and October to November 2005 for Ross Sea Sulfur Dynamics study (NODC Accession 0117322)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset contains transect data from two research cruises to the Ross Sea, Antarctica, aboard the RV Nathaniel B. Palmer (NBP) in December 2004 to January 2005...

  5. Effects of male removal on female reproductive biology in Ross' and Lesser Snow Geese

    Science.gov (United States)

    Leschack, C.R.; Afton, A.D.; Alisauskas, R.T.

    1998-01-01

    We studied effects of mate removal on nesting and hatching success, incubation behavior, body mass, and post-hatch dispersal distance of female Ross' (Chen rossii) and Lesser Snow Geese (C. caerulescens caerulescens) at Karrak Lake. N.W.T., Canada. Male ge and widowed and paired control females were monitored through post-hatch dispersal. Nesting and hatching success did not differ between species or treatments (widowed vs paired) and averaged 77.5 ?? 3.8% and 64.0 ?? 3.6% (??SE), respectively. Paired females spent more time with their bills tucked (23.7 ?? 3.3% vs 9.1 ?? 4.0%) and less time alert (8.6 ?? 2.9% vs 22.9 ?? 3.5%) while on nests than did widowed females. Snow widowed females (31.1 ?? 4.7%) and Ross' widowed females (20.6 ?? 6.0%) generally spent more time each day in head-up alert than did Snow paired females (7.1 ?? 3.8%). Snow paired maleS (11.8 ?? 3.8%), Ross' paired females (9.4 ?? 3.6%), and Ross' paired males (7.9 ?? 3.6%). Body mass of paired and widowed female Ross' Geese did not differ at hatch or at time of post-hatch recapture; however, mean distance recaptured from the breeding colony was greater for paired (50.9 ?? 6.1 km) than for widowed females (27.3 ?? 6.6 km). Total mass gain (276 ?? 19 g) and rate of mass gain (8.4 ?? 0.5 g/day), from hatch until post-hatch recapture (33.1 ?? 1.2 days), were similar for widowed and paired female Ross' Geese. Male removal experiments in monogamous, precocial species generally have produced few effects on female nesting success or incubation behavior. We suggest that male parental care in arctic-nesting geese is more critical during laying and the post-hatch period than during incubation.

  6. Temperature, salinity and oxygen data collected from the Oden in the Amundsen and Ross Seas, 2010 - 2011 (NODC Accession 0104260)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Data were collected to investigate the physical oceanography of the Amundsen and Ross Seas. Funded under the following projects: Physical Oceanography of the...

  7. Competition and Concentration in Bangladeshi Banking Sector: An Application of Panzar-Rosse Model

    Directory of Open Access Journals (Sweden)

    Md. Anwar Hossain Repon

    2016-01-01

    Full Text Available The purpose of this paper is to investigate the market structure and degree of concentration of Bangladeshi banking industry. The study measured market concentration by using widely recognized measures like k-bank concentration ratio and Herfindahl-Hirchman Index (HHI. It evaluates market structure by applying Panzar-Rosse Model over 8 years period from 2006 to 2013. The result of concentration measures indicates a decreasing trend and low level of market concentration in Bangladeshi banking industry over the sample period. The panzer-Rosse “H-Statistic” suggests that banks in Bangladesh are operating under monopolistic competition. Present paper contributes to a burgeoning literature on banking competition that has evolved significantly over the past periods on a developing country perspective like Bangladesh.

  8. Percutaneous valved stent repair of a failed homograft: implications for the Ross procedure.

    Science.gov (United States)

    Pretorius, Victor; Jones, Alan; Taylor, Dylan; Coe, Yashu; Ross, David B

    2008-08-01

    A case of percutaneous pulmonary valve implantation following a failed homograft in the pulmonary position is reported. A 16-year-old boy developed infective endocarditis of his pulmonary homograft, which was implanted four years earlier during a Ross procedure for congenital aortic stenosis. Following successful medical therapy, the boy was symptomatic due to pulmonary stenosis and regurgitation. A 22 mm Melody valve (Medtronic, USA) was successfully implanted percutaneously. His symptoms resolved and he was discharged home one day after the procedure. Echocardiography at the six-month follow-up demonstrated a normally functioning pulmonary valve. Percutaneous pulmonary valve replacement may make the Ross procedure a more attractive option for patients with aortic stenosis, particularly in the pediatric population.

  9. ROSS Video:摄像机机器人云台隆重登场BIRTV

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    ROSS Video作为一家拥有40年历史的广播电视设备制造厂商,在2012年取得了令人振奋的突破性增长。随着全球市场占有率的不断提高,今年早些时候ROSS分别完成了对比利时FX—Motion和美国Cambotics两家机器人摄像机跟踪遥控系统公司的收购,并成立了全新的ROSS Robotics部门,进一步扩展了其原有产品体系,为客户带来更丰富、更完整的视频制作解决方案。

  10. A Battle of Words: "Dignity" and "Peace" in the Writings of Elisabeth Kübler-Ross.

    Science.gov (United States)

    Burnier, Daniel

    2017-01-01

    This article analyzes the writings of Elisabeth Kübler-Ross through the discursive lens of the phrase "dying with dignity." For her, the phrase meant allowing someone to die comfortably his/her own death. This phrase has to be understood in relationship with the final "stage of acceptance" of her model. Describing this key part of her well-known scientific output, she often used, in the early 1970s, the phrase "dying in peace and dignity." An evaluation of the evidence suggests that because the concept of dignity was co-opted by the pro-euthanasia movement during this decade, the language of dignity was little by little abandoned by her. In later years, only "peace" survived from her favorite expression. Although this concept of peace remains present to the end in all Kübler-Ross writings, the pro-euthanasia movement has also started to speak the language of peace.

  11. From warm to cold: migration of Adélie penguins within Cape Bird, Ross Island

    OpenAIRE

    Yaguang Nie; Liguang Sun; Xiaodong Liu; Emslie, Steven D.

    2015-01-01

    Due to their sensitivity to environmental change, penguins in Antarctica are widely used as bio-indicators in paleoclimatic research. On the basis of bio-element assemblages identified in four ornithogenic sediment profiles, we reconstructed the historical penguin population change at Cape Bird, Ross Island, for the past 1600 years. Clear succession of penguin population peaks were observed in different profiles at about 1400 AD, which suggested a high probability of migration within this reg...

  12. Ross syndrome with ANA positivity: A clue to possible autoimmune origin and treatment with intravenous immunoglobulin

    Directory of Open Access Journals (Sweden)

    Vasudevan Biju

    2010-01-01

    Full Text Available A 28-year-old serving soldier presented with patchy areas of absence of sweating and blurring of vision. On examination he was found to have segmental anhidrosis, right sided tonic pupil and absent ankle jerks. Investigations revealed ANA positivity with no other abnormalities. He was treated with Intravenous immunoglobulin. This case of Ross syndrome is reported for its rarity as well as a clue to its probable autoimmune origin and treatment option with intravenous immunoglobulins.

  13. Climate variation and incidence of Ross river virus in Cairns, Australia: a time-series analysis.

    OpenAIRE

    Tong, S; Hu, W.

    2001-01-01

    In this study we assessed the impact of climate variability on the Ross River virus (RRv) transmission and validated an epidemic-forecasting model in Cairns, Australia. Data on the RRv cases recorded between 1985 and 1996 were obtained from the Queensland Department of Health. Climate and population data were supplied by the Australian Bureau of Meteorology and the Australian Bureau of Statistics, respectively. The cross-correlation function (CCF) showed that maximum temperature in the curren...

  14. Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica

    OpenAIRE

    J. Elster; L. Nedbalová; R. Vodrážka; K. Láska; J. Haloda; Komárek, J.

    2015-01-01

    The floors of two shallow endorheic lakes, located on volcanic surfaces on James Ross Island, are covered with calcareous organosedimentary structures. Their biological and chemical composition, lake water characteristics, and seasonal variability of the thermal regime are introduced. The lakes are frozen down to the bottom eight-nine months per year and their water chemistry is characterized by low conductivity and neutral to slightly alkaline pH. The photosynthetic microbi...

  15. Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica

    OpenAIRE

    J. Elster; L. Nedbalová; R. Vodrážka; K. Láska; J. Haloda; Komárek, J.

    2016-01-01

    The floors of two shallow endorheic lakes, located on volcanic surfaces on James Ross Island, are covered with calcareous organosedimentary structures. Their biological and chemical composition, lake water characteristics, and seasonal variability of the thermal regime are introduced. The lakes are frozen down to the bottom for 8–9 months a year and their water chemistry is characterised by low conductivity and neutral to slightly alkaline pH. The photosynthetic microbial ma...

  16. Heparin binding sites on Ross River virus revealed by electron cryo-microscopy

    OpenAIRE

    Zhang, Wei; Heil, Marintha; Kuhn, Richard J.; Baker, Timothy S.

    2005-01-01

    Cell surface glycosaminoglycans play important roles in cell adhesion and viral entry. Laboratory strains of two alphaviruses, Sindbis and Semliki Forest virus, have been shown to utilize heparan sulfate as an attachment receptor, whereas Ross River virus (RRV) does not significantly interact with it. However, a single amino acid substitution at residue 218 in the RRV E2 glycoprotein adapts the virus to heparan sulfate binding and expands the host range of the virus into chicken embryo fibrob...

  17. Competing connections between the Ross Ice Shelf with the Southern Ocean.

    Science.gov (United States)

    Jendersie, Stefan

    2016-04-01

    The stability of the Ross Ice Shelf (RIS) is critical to both the East Antarctic Ice Sheet, and the West Antarctic Ice Sheet. Results from a climatological ice shelf-ocean coupled numerical model (ROMS) suggest a new circulation mechanism associated with High Salinity Water (HSSW) production in the Ross Sea Polynya (RSP) that controls oceanic heat access to the RIS cavity. Within the RSP the dense water-saturated water column contracts during winter and causes a seasonal drop in Sea Surface Height (SSH) localised to a convection chimney under the RSP. The SSH gradients of up to 1.5 mm per km are sufficient to generate a barotropic pressure gradient that can counteract the wide scale horizontal baroclinic force and reverse the geostrophic circulation. In water depths between 600 and 800 m north of the western RIS the effect causes the seasonal occurrence of a cyclonic circulation cell with transports greater than 1Sv. Appearing with the beginning of winter sea ice formation in the RSP it significantly changes the dynamics at the ice shelf front. The new mechanism is described as one element in a framework of oceanographic processes that mitigate the exchange between the deep ocean and the ocean cavity under the RIS. Our study links local circulation features that are known from observation and previous model studies, and for the first time establishes a coherent system of responsible physical forcing processes in the Ross Sea.​

  18. Tidal Modulation of Ice-shelf Flow: a Viscous Model of the Ross Ice Shelf

    Science.gov (United States)

    Brunt, Kelly M.; MacAyeal, Douglas R.

    2014-01-01

    Three stations near the calving front of the Ross Ice Shelf, Antarctica, recorded GPS data through a full spring-neap tidal cycle in November 2005. The data revealed a diurnal horizontal motion that varied both along and transverse to the long-term average velocity direction, similar to tidal signals observed in other ice shelves and ice streams. Based on its periodicity, it was hypothesized that the signal represents a flow response of the Ross Ice Shelf to the diurnal tides of the Ross Sea. To assess the influence of the tide on the ice-shelf motion, two hypotheses were developed. The first addressed the direct response of the ice shelf to tidal forcing, such as forces due to sea-surface slopes or forces due to sub-ice-shelf currents. The second involved the indirect response of ice-shelf flow to the tidal signals observed in the ice streams that source the ice shelf. A finite-element model, based on viscous creep flow, was developed to test these hypotheses, but succeeded only in falsifying both hypotheses, i.e. showing that direct tidal effects produce too small a response, and indirect tidal effects produce a response that is not smooth in time. This nullification suggests that a combination of viscous and elastic deformation is required to explain the observations.

  19. Retreat history of the last glacial maximum ice sheet in Ross Sea, Antarctica

    Science.gov (United States)

    Shipp, Stephanie Staples

    High-resolution geophysical and geologic data were acquired in western and central Ross Sea, Antarctica, to determine the: (1) maximum extent and configuration of the ice sheet during the Last Glacial Maximum (LGM); (2) conditions and processes at the base of the expanded ice sheet and their role in ice stream activity; and (3) relative retreat history of the ice sheet. This information can provide geologic constraints for modeling of ice-sheet retreat. The research formed the basis for development of a public Web site (http://www.glacier.rice.edu) and for middle-school earth-science instructional materials. Based on identification of isolated grounding-zone wedges and consistency of mega-scale glacial lineations, the LGM ice edge reached the Coulman Island region in western Ross Sea. The maximum extent in central Ross Sea occurred at the continental-shelf edge, based on the presence of mega-scale glacial lineations, glacio-tectonic features, and shelf-edge gullies. Streaming ice, overlying a deforming bed typically catastrophic collapse of the ice sheet.

  20. On the dense water spreading off the Ross Sea shelf (Southern Ocean)

    Science.gov (United States)

    Budillon, G.; Gremes Cordero, S.; Salusti, E.

    2002-07-01

    In this study, current meter and hydrological data obtained during the X Italian Expedition in the Ross Sea (CLIMA Project) are analyzed. Our data show a nice agreement with previous data referring to the water masses present in this area and their dynamics. Here, they are used to further analyze the mixing and deepening processes of Deep Ice Shelf Water (DISW) over the northern shelf break of the Ross Sea. In more detail, our work is focused on the elementary mechanisms that are the most efficient in removing dense water from the shelf: either classical mixing effects or density currents that interact with some topographic irregularity in order to drop to deeper levels, or also the variability of the Antarctic Circumpolar Current (ACC) which, in its meandering, can push the dense water off the shelf, thus interrupting its geostrophic flow. We also discuss in detail the (partial) evidence of dramatic interactions of the dense water with bottom particulate, of geological or biological origin, thus generating impulsive or quasi-steady density-turbidity currents. This complex interaction allows one to consider bottom particular and dense water as a unique self-interacting system. In synthesis, this is a first tentative analysis of the effect of bottom particulate on the dense water dynamics in the Ross Sea.

  1. Current Clinical Application of Ross Procedure%Ross手术的临床应用现状

    Institute of Scientific and Technical Information of China (English)

    罗春生; 苏肇伉

    2006-01-01

    Ross手术自1967年应用于临床以来,已被用于各种原因引起的主动脉瓣狭窄、左心室流出道梗阻和二尖瓣病变.Ross手术经历了诸如根部置换、圆筒形包埋技术、瓣环缩小技术、Ross-Konno手术和自体肺动脉瓣二尖瓣置换术(Ross-Kabbani手术或Ross Ⅱ手术).由于自体肺动脉瓣有不需抗凝、大小适宜、能存活、生长和长期耐久的特性,并具有良好的血流动力学表现和对细菌性心内膜炎有抵抗力的优点,尤其适用于妊娠期妇女、儿童和青少年.现就Ross手术的外科技术、手术指征、选择标准、外科处理主动脉瓣狭窄、左心室流出道梗阻和二尖瓣病变的临床应用进展和效果进行综述.

  2. Effects of physical constraints on the lability of POM during summer in the Ross Sea

    Science.gov (United States)

    Misic, Cristina; Covazzi Harriague, Anabella; Mangoni, Olga; Aulicino, Giuseppe; Castagno, Pasquale; Cotroneo, Yuri

    2017-02-01

    The 0-200 m surface layer of the Ross Sea was studied during summer 2014 to investigate the lability of the particulate organic matter (POM) in response to physical parameters. With the use of satellite information, we selected three zones, characterised by different physical setting: a northern offshore area, crossing the summer-polynya area of the Ross Sea (hereafter called ROME 1), a more coastal area next to the Terra Nova Bay polynya (ROME 2); a southern offshore area, towards the Ross Ice Shelf (ROME 3). Ice-maps showed that the seasonal ice retreat had already occurred in early December for most of the stations. Statistical analysis of the quantitative and qualitative characteristics of the POM pointed to significant differences between the stations, especially in the upper mixed layer (UML). A comparison with previous studies showed that the localised pulses of POM accumulation in the UML were similar to those recorded at the highly productive marginal ice zones, providing notable trophic support to the ecosystem. The UML, although rather thin and easily subjected to alterations, confirmed its pivotal role in the ecosystem dynamics. A POM quality favourable to consumers was highlighted at several stations in ROME 1 and ROME 3. Reduced trophic support was, instead, found in ROME 2. Limited POM consumption where deep-water formation takes place would increase the POM role in the transfer of C to the depths.

  3. Applicability of highly branched isoprenoids as a sea ice proxy in the Ross Sea

    Science.gov (United States)

    Kim, Jung-Hyun; Lee, Jae Il; Belt, Simon T.; Gal, Jong-Ku; Smik, Lukas; Shin, Kyung-Hoon

    2016-04-01

    Sea ice is an integral component of the polar climate system, constraining the effect of changing surface albedo, ocean-atmosphere heat exchanges, the formation of deep and intermediate waters that participate in driving the meridional overturning circulation and thus global climate. In recent years, a mono-unsaturated highly branched isoprenoid (HBI) alkene which is biosynthesised by certain sea ice diatoms during the spring bloom and, upon ice melt, deposited into underlying sediments, has been uniquely observed in Arctic sea ice and in Arctic sediments. Hence, the term IP25 (ice proxy with 25 carbon atoms) was proposed to distinguish this compound from other HBI isomers and has become an established proxy for the reconstruction of Arctic sea ice. In contrast, a monounsaturated HBI alkene, i.e. IP25, has not been observed in sea ice or sediments from the Antarctic. Hence, the application of diene and triene HBI concentrations and the resulting diene/triene (D/T) ratio was alternatively introduced as sea ice/open water indicators in the Southern Ocean. However, there is still lack of data covering the wide areas around the Antarctic, especially from the Ross Sea. Hence, we investigated surface sediment samples from the Ross Sea (n=14) collected during the R/V ARAON cruise in 2015 as well as from the Antarctic Peninsula (n=17) collected during several R/V ARAON cruises between 2001 and 2013. We will present our preliminary results and will discuss the applicability of the HBI in the Ross Sea.

  4. Subglacial Lake Whillans, West Antarctica; Solute Dynamics and Fluxes to the Ross Sea

    Science.gov (United States)

    Skidmore, M. L.; Michaud, A. B.; Achberger, A.; Barbante, C.; Christner, B. C.; Mikucki, J.; Mitchell, A. C.; Priscu, J. C.; Purcell, A. M.; van Gelder, W.; Vick-Majors, T.

    2014-12-01

    Subglacial Lake Whillans is located beneath the Whillans Ice Stream in West Antarctica. The lake is situated beneath 800 m of ice and ~ 70 km upstream of the grounding line where Whillans Ice Stream terminates into the Ross Sea. Subglacial Lake Whillans is a shallow lake and a component of a complex subglacial hydrological system that may resemble a large wetland along the Siple Coast of West Antarctica. Subglacial Lake Whillans drains and refills on a sub-decadal time scale discharging water towards the Ross Sea. Water and sediment samples were recovered from the lake, using clean access drilling technologies, in January, 2013. Isotopic analysis of the lake waters indicates basal meltwater from the ice sheet as the dominant water source. Geochemical analysis of the lake water reveals it is freshwater with mineral weathering as a significant solute source, with a minor contribution from sea water likely from relict marine sediments. Subglacial hydrothermal activity upstream may also contribute solutes. Nutrients N and P are present at micromolar concentrations. Sediment porewaters from shallow cores (~ 40 cm depth) of the subglacial lake sediments indicate increasing solute concentration with depth, with up to ~ five times greater solute concentrations than in the lake water. The waters and sediment contain metabolically active organisms which are likely involved in elemental cycling within the lake system. Here we will discuss solute sources to the lake, solute dynamics within the lake waters and sediment, and the fluxes of solute and nutrients to the Ross Sea and their implications for these marine ecosystems.

  5. Collaborative Research and Education in the Ross Sea: A broader impact evaluation report

    Science.gov (United States)

    Parsons, C.; Kohut, J. T.; Lichtenwalner, C. S.; Clark, H.

    2010-12-01

    An interdisciplinary team of researchers will focus on describing the high productivity patchiness observed in phytoplankton blooms in the mid-to-late summer in the Ross Sea, Antarctica. They will use a novel sampling strategy that employs a remotely controlled glider (AUV) to locate and map circumpolar deep water in near real time and also to direct further ship-based sampling. This unusual coordination of a polar research vessel with AUVs provides an exciting opportunity to engage formal and informal educators in a research adventure. As part of this NSF-funded project’s Criterion 2 broader impact, joining the researchers virtually will be 30 New Jersey middle-school teachers and their students. This summer in New Jersey, in partnership with Liberty Science Center educators, COSEE-NOW (Centers for Ocean Sciences Education Excellence-Networked Ocean World) and Woods Hole Oceanographic Institution, the project team introduced teachers to the Ross Sea, the research, the science behind it and the AUV. The summer workshop and ongoing schoolyear support is providing the teachers with the tools they need to bring the excitement of the research into their classrooms in real time during the Ross Sea cruise at the end of this year. This presentation by Chris Parsons, the project evaluator, will summarize the evaluation plan for this broader impact project, which follows teachers and their classes for a year, and provide the latest evaluation results from this project.

  6. Atmospheric forcing of sea ice anomalies in the Ross Sea Polynya region

    Science.gov (United States)

    Dale, Ethan; McDonald, Adrian; Rack, Wolfgang

    2016-04-01

    Despite warming trends in global temperatures, sea ice extent in the southern hemisphere has shown an increasing trend over recent decades. Wind-driven sea ice export from coastal polynyas is an important source of sea ice production. Areas of major polynyas in the Ross Sea, the region with largest increase in sea ice extent, have been suggested to produce the vast amount of the sea ice in the region. We investigate the impacts of strong wind events on polynyas and the subsequent sea ice production. We utilize Bootstrap sea ice concentration (SIC) measurements derived from satellite based, Special Sensor Microwave Imager (SSM/I) brightness temperature images. These are compared with surface wind measurements made by automatic weather stations of the University of Wisconsin-Madison Antarctic Meteorology Program. Our analysis focusses on the winter period defined as 1st April to 1st November in this study. Wind data was used to classify each day into characteristic regimes based on the change of wind speed. For each regime, a composite of SIC anomaly was formed for the Ross Sea region. We found that persistent weak winds near the edge of the Ross Ice Shelf are generally associated with positive SIC anomalies in the Ross Sea polynya area (RSP). Conversely we found negative SIC anomalies in this area during persistent strong winds. By analyzing sea ice motion vectors derived from SSM/I brightness temperatures, we find significant sea ice motion anomalies throughout the Ross Sea during strong wind events. These anomalies persist for several days after the strong wing event. Strong, negative correlations are found between SIC within the RSP and wind speed indicating that strong winds cause significant advection of sea ice in the RSP. This rapid decrease in SIC is followed by a more gradual recovery in SIC. This increase occurs on a time scale greater than the average persistence of strong wind events and the resulting Sea ice motion anomalies, highlighting the production

  7. Completion of the large-capacity SVC system for Ross substation in Australia; Australia Ross hendensho muke daiyoryo SVC system no kansei

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1999-03-01

    Toshiba delivered the static var compensator (SVC) of 230MVA in rated capacity to Ross substation connected with 275kV system of Powerlink electric power co. in Queensland, Australia for retaining and stabilizing power system voltage, and stabilizing fluctuation of power systems in power system troubles, and started its service operation in Nov. 1998. The SVC is composed of a thyristor control reactor (TCR) and filter, and the largest class facility in the world as TCR. The SVC is also supported by the latest technologies such as photo-direct ignition thyristor valve and 32 bit-computer control. This is Toshiba`s 6th power SVC delivered to Australia. (translated by NEDO)

  8. Las zeolitas de los basaltos del Grupo Volcánico Isla James Ross, en las proximidades de Punta Santa Rita, isla James Ross, Antártida

    Directory of Open Access Journals (Sweden)

    Teresita Montenegro

    2013-12-01

    Full Text Available En la isla James Ross, al noreste de la península Antártica, afloran sedimentitas cretácicas y las suprayacen los basaltos del Grupo Volcánico Isla James Ross. Éstos se caracterizan por diferentes coladas emplazadas en ambientes marino subácueo, subglacial, y subaéreo. Las coladas emplazadas en ambiente subácueo originan hialoclastitas. En Punta Santa Rita (64°13'52''LS y 57°16'10''LO, situada al sureste de Punta Ekelöf, algunos niveles de basaltos subaéreos poseen estructura amigdaloide, con cavidades de tamaño variable entre 0,3 mm y 1 cm, rellenas con zeolitas y calcita. Los minerales que componen el relleno de las cavidades han sido estudiados con técnicas petrográficas convencionales, microscopía electrónica de barrido, EDS y difracción de rayos x. Todas las zeolitas están enriquecidas en Na. Un intercrecimiento de chabazita-gmelinita, tapiza las paredes de las cavidades, acompañadas por analcima, thomsonita, phillipsita, y calcita hacia el centro, mineral que también se presenta en venillas. El vidrio palagonítico se localiza en las superficies libres y químicamente también está enriquecido en Na, además de Al, K y Ca. Las asociaciones de zeolitas se habrían originado por reacción con aguas superficiales durante el enfriamiento inicial de los flujos de lavas y por recristalización de vidrio. Los basaltos habrían estado expuestos a la acción de fluidos de origen marino, evidenciado por la abundancia de Na hallada en todas las zeolitas y en la palagonita.

  9. Katherine Bonil Gómez. Gobierno y calidad en el orden colonial. Las categorías del mestizaje en la provincia de Mariquita en la segunda mitad del siglo XVIII

    Directory of Open Access Journals (Sweden)

    Heraclio Bonilla Mayta

    2012-01-01

    Full Text Available El libro reciente de Katherine Bonil, historiadora de la Universidad de los Andes, es una importante contribución al conocimiento de la formación de las identidades étnicas, en este caso en el contexto de Mariquita en el siglo XVIII. El papel que tuvieron los grupos de poder local en esa definición es sin duda central, como lo reconoce, con razón la autora.; aunque no es menos importante saber que esas identidades no se construyeron solo de manera vertical, sino en la interacción cotidiana de grupos que compartieron una misma posición, aunque separados y opuestos por razones raciales y culturales. Pese a que Mariquita tuvo una población india originaria relativamente pequeña, no hay que olvidar que durante el auge de la actividad minera en el siglo XVII fue el centro de movilización compulsiva, la así llamada “mita” neogranadina, de cientos de nativos procedentes de Santafé de Bogotá y de Tunja para extraer el metal de sus socavones.

  10. 影视作品《英国病人》中凯瑟琳的女权表征%Representation of Feminism on Katherine in Movie The English Patient

    Institute of Scientific and Technical Information of China (English)

    朱各各

    2016-01-01

    Although the movie T he English Patient presents a moving but tragic love story ,it also re-veals the oppression of patriarchy on woman under the background of a patriarchal society .The heroine Katherine makes great efforts in resisting hidden patriarchal power ,so the article will discuss her defiance to patriarchal society :obtaining the initiative in female’s body narration;pursuing equal female discourse pow er ;rejecting patriarchal-type nomination .%电影《英国病人》呈现了一个凄美的爱情故事,但以父权制社会规约和文化为背景,作品也呈现了父权制对女性的压迫。女主角凯瑟琳对隐性父权作出了一定的反抗,从三个方面分析她与父权制社会的对抗:取得女性身体书写的主动权;寻求平等女性话语权;拒绝父权化命名。

  11. Intermediate-term results of Medtronic freestyle valve for right ventricular outflow tract reconstruction in the Ross procedure.

    Science.gov (United States)

    Bilal, Mehmet S; Aydemir, Numan A; Cine, Nihat; Turan, Tamer; Yildiz, Yahya; Yalcin, Yalim; Celebi, Ahmet

    2006-09-01

    The Ross procedure has become the first choice for aortic valve replacement in children and young adults at many institutions. Since 1997, a lack of availability of homograft valves in Turkey has prompted the use of alternative substitutes for right ventricular outflow tract (RVOT) reconstruction during the Ross procedure. Before April 2005, among 20 patients (age range: 14 months to 45 years) at the present authors' institution, the Ross procedure was performed in 14 and a Ross-Konno procedure in six. Sixteen patients underwent RVOT repair using alternative methods for homograft valve replacement. Fourteen patients received a Medtronic Freestyle valve and one patient a Medtronic Contegra bovine jugular vein conduit. An autologous RVOT repair was used in one patient. Ten of the Medtronic Freestyle valve patients were aged Medtronic Freestyle valve echocardiographic evaluations were conducted shortly after surgery and during follow up. There was no early mortality. One patient died from pneumonia after six months, and another (asymptomatic) patient died suddenly at 34 months after surgery. Before hospital discharge the mean peak pressure gradient across the Freestyle valve was 12.1 +/- 11.0 mmHg, and this increased to 24.1 +/- 20.0 mmHg after a mean follow up of 51.2 +/- 6.9 months (range: 6 to 101 months) (p Medtronic Freestyle valve, the present results show that the valve can be used with intermediate-term success in the Ross procedure - and even in children as an alternative - if homograft valves are not available.

  12. Analyses on Origin of positive gravity anomalies of sedimentary basins of the Ross Sea

    Science.gov (United States)

    Gao, Jinyao; Yang, Chunguo; Ji, Fei; Wang, Wei; Shen, Zhongyan

    2017-04-01

    We have adopted gridded products describing surface elevation, ice-thickness and the sea floor and subglacial bed elevation south of 60◦ S from Bedmap2 and north of 60◦ S from JGP95E to calculate Bouguer and isostatic gravity anomaly of the Ross Sea region based on the DTU10 free-air gravity anomaly.Taking a view of the free-air, Bouguer and isostatic gravity anomalies, it is unusual that high values overlay the Victoria Land Basin, Central Trough, Northern Basin and Northern Central Trough while basement highs are associated with low value. A number of studies have attributed the high gravity anomalies across the depocenters to high-density volcanics deep within the basins or magmatic intrusions within the region of the thinned crust or upper mantle (e. g., Edwards et al., 1987). According to the conclusion from Karner et al. (2005), the anticorrelation of gravity anomalies with sediment basement can be reproduced if the flexural strength of the lithosphere during the late Cretaceous rifting is significantly lower than the flexural strength of the lithosphere at the Oligocene and Neogene time of sedimentation. We note that the isostatic gravity anomalies are higher than the free-air gravity anomalies adjacent to the Transantarctic Mountains, and vice versa away from the Transantarctic Mountains. We may ignore the constraints offered by the tranditional isostasy in the local gravity studies of the Ross Sea basins, especially advancing the concept of high density material in the lower crust or upper mantle. In particular, the modeled gravity does not laterally integrate to zero, due to the existence of unbalanced forces induced by mantle. Along the outer shelf uplift zone surrouding Antarctica, the positive gravity belt has higher values in free-air gravity anomalies than those in isostatic gravity anomalies. Meanwhile, the positive gravity belt of isostatic gravity anomalies almost disappears in the background anomalies of 20 mGal to 10 mGal facing the

  13. X-ray Ross filter method for impurity transport studies on DIII-D (abstract)

    Science.gov (United States)

    Bogatu, I. N.; Kim, J. S.; Egdell, D. H.; Snider, R. T.; Brooks, N. H.; Wade, M. R.; West, W. P.

    2001-01-01

    The injection of Ar into the region of the DIII-D divertor is a promising technique for energy dissipation (through radiation and collisions) and consequently for reduction of the heat load on the plates. An important problem related to this technique, is the inherent poisoning of the core plasma by migrating Ar. The Ar core contamination seems also to improve the thermal transport in an advanced operating mode of the tokamak. It is therefore of great importance to measure the evolution of the impurity concentration profile within the core plasma. This goal could be achieved by using the Ross filter method in conjunction with the existing x-ray diagnostics on DIII-D. A basic Ross filter system consists of two identical detectors placed behind two different x-ray absorbing foils looking at the same plasma volume. The foils are made of different elements or compounds with adjacent or nearly adjacent atomic numbers. Their accurate thickness causes the x-ray transmission curves of the two foils to be effectively identical over the entire energy range except within the narrow region between their absorption edges. Since the transmission characteristics of the foils above and below their absorption edges are the same, any difference in the two detected signals is proportional to the total x-ray power of the emission spectrum between these two edge energies. An x-ray Ross filter with its energy pass band centered on the Ar XVII Kα line at 3.14 keV has been designed. This allows for the discrimination of the Ar Kα line only, regardless of Ar ionization state, against any background radiation with energies outside the energy pass band. The Ross filter was installed in front of two of the fan shaped poloidal x-ray arrays on DIII-D. The first measurements showed very good discrimination against Ne, another injected impurity. Emissivity profile evolution of the Kα lines and Ar enhanced continuum within the energy pass band of the Ross filter can be determined from the x

  14. Ambient Seismic Signals Observed in Iceberg?Filled Waters of the Ross Sea, Antarctica.

    Science.gov (United States)

    Macayeal, D. R.; Okal, E. A.; Aster, R. C.

    2006-12-01

    A two-year seismometer deployment on various icebergs in the Ross Sea and on the Ross Ice Shelf (PASSCAL project SOUTHBERG) have produced an unusual seismological "tone poem" constituting a sample of ambient conditions in an iceberg-covered, coastal sea of Antarctica. The original motivation of the project was to investigate the source of signals seen as T-phases in the equatorial Pacific [e.g., Talandier et al., 2002]. During the periods of continuous seismometer operation (i.e., during the October - April periods of 2003-4 and 2004-5 when photovoltaic charging systems kept seismometers in operation) on icebergs B15A, C16 and Nascent Iceberg (a site not yet calved from the Ross Ice Shelf), about 1300 events were observed (roughly one event per day). These events are attributed to the icebergs, and are loosely referred to as "iceberg tremor" due to their long duration (many hours) and spectral structure (e.g., characterized by clearly preferential frequencies in the 1-3 Hz range, accompanied by multiple harmonics of a variable-pitch fundamental). The purpose of this presentation is to give a general qualitative overview of the various categories of iceberg tremor, and to describe their relationship to other variables observed (e.g., iceberg drift velocity, iceberg-on-iceberg collision, iceberg-on-seabed scraping). Speculation on the cause or causes of iceberg tremor will be postponed pending further study. Suggestions as to the relationship between the ambient tone poem of iceberg-covered waters and hydro-acoustic and seismic signals seen in the ocean beyond Antarctica will be offered.

  15. Insights into accumulation variability over the last 2000 years at James Ross Island, Antarctic Peninsula

    Science.gov (United States)

    Massam, A.; Mulvaney, R.; McConnell, J.; Abram, N.; Arienzo, M. M.; Whitehouse, P. L.

    2016-12-01

    The James Ross Island ice core, drilled to 364 m on the northern tip of the Antarctic Peninsula, preserves a climate record that spans beyond the Holocene period to the end of the last glacial maximum (LGM). Reanalysis of the ice core using high-resolution continuous flow analysis (CFA) highlighted errors in the identification of events of known age that had been used to constrain the earlier chronology. The new JRI2 chronology is annual layer counted to 300 years, with the remaining profile reconstructed using a new age-depth model that is tied to age horizons identified in the annual-layer counted WAIS Divide ice core record. An accurate age-depth profile requires reliable known-age horizons along the ice core profile. In addition, these allow us to determine a solution for the accumulation history and rate of compaction due to vertical strain. The accuracy of the known-age constraints used in JRI2 allows only a small uncertainty in the reconstruction of the most recent 2000 years of accumulation variability. Independently, the surface temperature profile has been estimated from the stable water isotope profile and calibrated to borehole temperature observations. We present the accumulation, vertical thinning and temperature history interpreted from the James Ross Island ice core for the most recent 2000 years. JRI2 reconstructions show accumulation variability on a decadal to centennial timescale up to 20% from the present-day mean annual accumulation rate of 0.63 m yr-1. Analysis of the accumulation profile for James Ross Island offers insight into the sensitivity of accumulation to a change in surface temperature, as well as the reliability of the assumed relationship between accumulation and surface temperature in climate reconstructions using stable water isotope proxies.

  16. Soil micromorphology, geochemistry and microbiology at two sites on James Ross Island, Maritime Antarctica

    Science.gov (United States)

    Meier, Lars A.; Krauze, Patryk; Prater, Isabel; Scholten, Thomas; Wagner, Dirk; Kühn, Peter; Mueller, Carsten W.

    2017-04-01

    Referring to the fundamental question in ecosystem research, how biotic and abiotic processes interact, only a few studies exist for polar regions that integrate microbiological and soil scientific studies . Soils comprise the complex structure and environment that fosters water storage and nutrient cycling determined by its unique chemical, physical and biological properties with respect to the specific climate and parent material. In the extreme environment of Antarctica, soil biological processes are primarily controlled by microbial communities (Bacteria, Archaea and Fungi), and thus microbiota may also determine soils chemical and physical properties in a landscape lacking higher plants at an average air temperature below 0°C. James Ross Island, Maritime Antarctica, offers a pristine laboratory and an exceptional opportunity to study pedogenesis without the influence of vascular plants and burrowing animals. We analysed micromorphological features, chemical and microbiological measures at two sites on James Ross Island (Brandy Bay and St. Martha Cove) with similar substrates (mostly fine-grained calcareous sandstones and siltstones of the Alpha Member of the Santa Martha Formation with varying amounts of conglomerates and mudstones) at similar topographic positions (small plateaus at similar elevation (80m a.s.l.)). The sites represent luv- and leeward conditions with respect to the main southwesterly winds. The climate on James Ross Island is to be described as semi-arid polar-continental, which is in clear contrast to the Southern Shetlands (e.g. King George Island) north of the Antarctic Peninsula. We will present first results of soil physical (bulk density, soil moisture and grains size distribution), pedochemical (SOC, total N and S, pH, CECeff, and pedogenic oxides) micromorphological and microbial analyses (Microbial DNA content, microbial abundances).

  17. Structural map of flow variability and propagation behavior in the Ross Ice Shelf

    Science.gov (United States)

    LeDoux, C. M.; Hulbe, C. L.

    2011-12-01

    Fracture geometries in the Ross Ice Shelf, observable using visible band satellite imagery from the MODIS Mosaic of Antarctica (MOA) and the Landsat Image Mosaic of Antarctica (LIMA) provide a unique opportunity to study fracture propagation behavior and discharge variability in the ice streams and outlet glaciers feeding the shelf. Propagation is driven by changes in fracture length, near-field stress conditions, and the material properties of the ice. Changes in ice stream discharge and the development of "sticky spots," in both ice streams and within the shelf, lead to redirection of flow, changes in lateral gradients of ice velocity, and the propagation of fractures in response to changes in near-field stresses. The propagation behaviors most commonly observed in the ice shelf are the growth in the transverse direction of a fracture that formed within a shear zone and mechanical interactions between adjacent fracture tips. We use fracture mechanics theory and remote-sensed imagery to categorize fracture patterns and longitudinal zones of fractured ice in the Ross Ice Shelf. Near current sites of formation, simple fracture geometries and principal stresses are used to illustrate physical processes related to the formation and propagation of fractures. To compute flow lines and principal stresses, we derive a velocity map of the Ross Ice Shelf by merging two velocity datasets using a combination of statistical methods. A structural map of fracture geometries, relict shear margins, and structural boundaries is constructed. Using the ice shelf features, present-day flow lines, and principal stresses, we investigate the manner in which principal stresses affect fracture formation and propagation behavior and the variability of ice stream discharge into the shelf.

  18. The relevance of buttressing for Filchner-Ronne and Ross Ice Shelf

    Science.gov (United States)

    Reese, Ronja; Gudmundsson, Hilmar; Levermann, Anders; Winkelmann, Ricarda

    2016-04-01

    Sub-shelf melting is an important component of Antarctica's mass budget. Although thinning of ice shelves does not directly contribute to sea-level rise, it may have a significant indirect impact through the potential of ice shelves to buttress their adjacent ice sheet. This is clearly seen in recent observations, e.g. in the Amundsen region (Pritchard et al., 2012) or at the Southern Antarctic Peninsula (Wouters et al, 2015) where increased ice loss of the adjacent upstream drainage basins is attributed to enhanced sub-shelf melting. In the extreme case, the complete disintegration of an ice shelf, e.g. during the calving events of Larsen A and B in 1995 and 2002, respectively, the adjacent ice streams subsequently accelerated significantly (Scambos et al., 2014). Here, we investigate the importance of buttressing using the finite-element, shallow-stream approximation numerical model Úa. We derive transfer functions for an idealized setup (Gudmundsson et al. 2012) and the Filchner-Ronne and Ross Ice Shelf. They allow for the computation of instantaneous changes in velocities to thickness perturbation patterns. Based on the transfer functions, we calculate the sensitivity of flux across the grounding line to regional varying melting patterns for the idealized setup and for Filchner-Ronne and Ross Ice Shelf. We find that the immediate response of velocities in the ice shelf-ice sheet system to changes in sub-shelf melting can be understood as the interaction of two effects: On the one hand, the spreading rate is a function of local ice thickness, indicating that a thinning of the ice shelf reduces velocities. On the other hand, ice shelf thinning weakens its ability to buttress, and thus enhances velocities. These two processes compete, leading to a complex pattern of velocity changes within the ice shelf. We find - both in the idealized setup and for Ross and Filchner-Ronne Ice Shelves - that the reduction in buttressing is dominating the velocity changes in the

  19. Ross Chowles:创新(innovation)VS创意(creativity)

    Institute of Scientific and Technical Information of China (English)

    李雅静; 余跃; 李志坚

    2005-01-01

    Ross Chowles创立了南非最著名的Jupiter Drawing Room独立公司,在2004年12月的One show(中国)上与会者都听到了他精彩的演讲。我在会后和他一起探讨了很多广告创意的优势和存在的弊病。在2005年,我们持续了去年未尽兴的话题。

  20. Chili Cookoff: Unique Ingredients Prove Successful in Ross Smith’s Big Pot of Chili | Poster

    Science.gov (United States)

    By Ashley DeVine, Staff Writer If the past is any indication, judges at the Protective Services Chili Cookoff give high marks for chili recipes containing unique or uncommon ingredients. Previous winning recipes have included ingredients such as black beans, pumpkin, pineapple, pork loin, and even bourbon. Judges at the 12th annual event, held Jan. 5, continued this tradition by voting for Ross Smith’s Big Pot of Chili, which featured three types of meat, four different sauces, baker’s chocolate, and parmesan rind.  

  1. Diet and trophic niche of Antarctic silverfish Pleuragramma antarcticum in the Ross Sea, Antarctica.

    Science.gov (United States)

    Pinkerton, M H; Forman, J; Bury, S J; Brown, J; Horn, P; O'Driscoll, R L

    2013-01-01

    The diet of Antarctic silverfish Pleuragramma antarcticum was evaluated by examining stomach contents of specimens collected in the Ross Sea (71°-77° S; 165°-180° E) in January to March 2008. Pleuragramma antarcticum (50-236 mm standard length, L(S)) and prey items were analysed for stable-isotopic composition of carbon and nitrogen. According to index of relative importance (I(RI) ), which incorporates frequency of occurrence, mass and number of prey items, the most important prey items were copepods (81%I(RI) over all specimens), predominantly Metridia gerlachei and Paraeuchaeta sp., with krill and fishes having low I(RI) (2·2 and 5·6%I(RI) overall). According to mass of prey (M) in stomachs, however, fishes (P. antarcticum and myctophids) and krill dominated overall diet (48 and 22%M, respectively), with copepods being a relatively minor constituent of overall diet by mass (9·9%M). Piscivory by P. antarcticum occurred mainly in the extreme south-west of the region and near the continental slope. Krill identified to species level in P. antarcticum stomachs were predominantly Euphausia superba (14·1%M) with some Euphausia crystallophorias (4·8%M). Both DistLM modelling (PRIMER-permanova+) on stomach contents (by I(RI)) and stepwise generalized linear modelling on stable isotopes showed that L(S) and location were significant predictors of P. antarcticum diet. Postlarval P. antarcticum (50-89 mm L(S)) consumed exclusively copepods. Juvenile P. antarcticum (90-151 mm L(S)) consumed predominantly krill and copepods by mass (46 and 30%M, respectively). Small adult P. antarcticum (152-178 mm L(S)) consumed krill, fishes and copepods (37, 36 and 15%M, respectively). Large adult P. antarcticum (179-236 mm L(S)) consumed predominantly fishes and krill (55 and 17%M, respectively), especially in the north (near the Ross Sea slope) and in the SW Ross Sea. Amphipods were occasionally important prey items for P. antarcticum (western Ross Sea, 39%M). General

  2. Landscapes of the Self. The Cinema of Ross McElwee

    OpenAIRE

    García-Martínez, A.N. (Alejandro Néstor)

    2007-01-01

    Ross McElwee’s innovative work negotiates its genre identity from a marginal land. Straddled between filmic diaries, performative documentary and home movies, his work falls into a genre that is difficult to place. Just as with the other analyses of this book, we are banking on film essay as the most appropriate label for describing the work of this landscape artist of the self hailing from the American south. It is not Monet’s pictorial impressionism. The intellectual mirror of McElwee could...

  3. Moses presages Kubler-Ross: five stages in accepting death, as seen in the midrash.

    Science.gov (United States)

    Berkowitz, M C; Knight, L

    2001-11-01

    This paper elucidates and explains an ancient midrash (rabbinic interpretation of a biblical text) through the lens of modern psychological theory. The midrash describes Moses' reactions to his approaching death. The paper points out that these reactions anticipate the five classic stages, described by Elizabeth Kubler-Ross, of coming to accept terminal illness: denial, anger, bargaining, depression and acceptance. The article shows the ancient rabbis' sensitivity to human feeling and the universal nature of human reaction through the dialogue and reactions they attribute to Moses. Finally, it shows how using this midrash offers a constructive model for approaching death, for Jewish and non-Jewish patients alike, as well as their caregivers.

  4. William Parsons, 3rd Earl of Rosse astronomy and the castle in nineteenth-century Ireland

    CERN Document Server

    Mollan, R Charles

    2015-01-01

    This is a revealing account of the family life and achievements of the Third Earl of Rosse, a hereditary peer and resident landlord at Birr Castle, County Offaly, in nineteenth-century Ireland, before, during and after the devastating famine of the 1840s. He was a remarkable engineer, who built enormous telescopes in the cloudy middle of Ireland. The book gives details, in an attractive non-technical style which requires no previous scientific knowledge, of his engineering initiatives and the astronomical results, but also reveals much more about the man and his contributions - locally in the

  5. The effects of changing winds and temperatures on the oceanography of the Ross Sea in the 21st century

    Science.gov (United States)

    Smith, Walker O.; Dinniman, Michael S.; Hofmann, Eileen E.; Klinck, John M.

    2014-03-01

    The Ross Sea is critically important in regulating Antarctic sea ice and is biologically productive, which makes changes in the region's physical environment of global concern. We examined the effects of projected changes in atmospheric temperatures and winds on aspects of the ocean circulation likely important to primary production using a high-resolution sea ice-ocean-ice shelf model of the Ross Sea. The modeled summer sea-ice concentrations decreased by 56% by 2050 and 78% by 2100. The duration of shallow mixed layers over the continental shelf increased by 8.5 and 19.2 days in 2050 and 2100, and the mean summer mixed layer depths decreased by 12 and 44%. These results suggest that the annual phytoplankton production in the future will increase and become more diatomaceous. Other components of the Ross Sea food web will likely be severely disrupted, creating significant but unpredictable impacts on the ocean's most pristine ecosystem.

  6. Distribution of total alkalinity and pH in the Ross Sea (Antarctica waters during austral summer 2008

    Directory of Open Access Journals (Sweden)

    Paola Rivaro

    2014-10-01

    Full Text Available Measurements of total alkalinity (AT and pH were made in the Ross Sea in January–February 2008 in order to characterize the carbonate system in the Ross Sea and to evaluate the variability associated with different water masses. The main water masses of the Ross Sea, Antarctic Surface Water, High Salinity Shelf Water (HSSW, Deep Ice Shelf Water, Circumpolar Deep Water (CDW and Antarctic Bottom Water, were identified on the basis of the physical and chemical data. In particular, the AT ranged between 2275 and 2374 µmol kg−1 with the lowest values in the surface waters (2275–2346 µmol kg−1, where the influence of the sea-ice melting and of the variability of the physical properties was significant. In the deep layers of the water column, the AT maxima were measured in correspondence to the preferential pathways of the spreading HSSW. The pH had variable values in the surface layer (7.890–8.033 with the highest values in Terra Nova Bay and Ross Sea polynyas. A low pH (7.969±0.025 traced the intrusion of the CDW in the Ross Sea shelf area. All samples revealed waters that were oversaturated with respect to both calcite and aragonite, but near corrosive levels of aragonite saturation state (Ω ca. 1.1–1.2 were associated with the entrainment of CDW over the slope. Aragonite undersaturation is of particular concern for the zooplankton species comprising to calcifying organisms such as pteropods. The partial pressure of CO2 at the sea surface was undersaturated with respect to the atmospheric value, particularly in Terra Nova Bay and the Ross Sea polynyas, but a large variability in the sea–air CO2 fluxes was observed associated with different responses in the strength of the biological and physical processes.

  7. Survival comparison of the ross procedure and mechanical valve replacement with optimal self-management anticoagulation therapy: Propensity-matched cohort study

    NARCIS (Netherlands)

    M.M. Mokhles (Mostafa); H. Körtke (Heinrich); U. Stierle (Ulrich); O. Wagner (Otto); E.I. Charitos (Efstratios); A.J.J.C. Bogers (Ad); J. Gummert (Jan Fritz); H. Sievers (Hans Hinrich); J.J.M. Takkenberg (Hanneke)

    2011-01-01

    textabstractBackground-: It is suggested that in young adults the Ross procedure results in better late patient survival compared with mechanical prosthesis implantation. We performed a propensity score-matched study that assessed late survival in young adult patients after a Ross procedure versus t

  8. Survival comparison of the ross procedure and mechanical valve replacement with optimal self-management anticoagulation therapy: Propensity-matched cohort study

    NARCIS (Netherlands)

    M.M. Mokhles (Mostafa); H. Körtke (Heinrich); U. Stierle (Ulrich); O. Wagner (Otto); E.I. Charitos (Efstratios); A.J.J.C. Bogers (Ad); J. Gummert (Jan Fritz); H. Sievers (Hans Hinrich); J.J.M. Takkenberg (Hanneke)

    2011-01-01

    textabstractBackground-: It is suggested that in young adults the Ross procedure results in better late patient survival compared with mechanical prosthesis implantation. We performed a propensity score-matched study that assessed late survival in young adult patients after a Ross procedure versus

  9. The Xanthophyceae and Chlorophyceae of the Western Ross Sea, Victoria Land, Antarctica and Macquarie Island collected under the direction of Prof. Dr. J. S. Zaneveld (1963—1967)

    NARCIS (Netherlands)

    Wagner, H.P.; Zaneveld, J.S.

    1988-01-01

    During the austral summer seasons of 1963-1964 and 1964-1965, and during the austral winter season of 1967 Prof. Dr. J.S. Zaneveld made collection expeditions to the western Ross Sea. In 1965 collections were also made from the U.S.C.G. icebreaker ‘Glacier’, around the western Ross Sea and around th

  10. Influence of a yeast fermented product on the serum levels of the mannan-binding lectin and the antibodies against the Newcastle disease virus in Ross broilers

    DEFF Research Database (Denmark)

    Cortés-Coronado, R F; Gómez-Rosales, S; de L Angeles, M;

    2017-01-01

    The objective of this research was to evaluate the serum concentrations of mannan-binding lectin (MBL) at different ages in Ross broilers fed increasing amounts of a yeast-fermented product (YFP) and inoculated with a vaccine against Newcastle disease virus (NDV). Eighty mixed Ross B308 broilers...

  11. The molecular and cellular aspects of arthritis due to alphavirus infections: lesson learned from Ross River virus.

    Science.gov (United States)

    Rulli, Nestor E; Melton, Julian; Wilmes, Anja; Ewart, Gary; Mahalingam, Suresh

    2007-04-01

    Alphaviruses such as the Sindbis-group viruses, Scandinavian Ockelbo virus, the African Asian chikungunya virus, the African O'nyong-nyong virus, the South American Mayaro virus, and the Australasian Barmah Forest and Ross River viruses, are commonly associated with outbreaks of acute and persistent arthritis and arthralgia in humans. The mechanisms by which these viruses cause arthritis/arthralgia are poorly understood. This chapter summarizes our current understanding of viral arthritides using our newly developed mouse model of Ross River virus-induced joint and muscle inflammation.

  12. Skeletal and isotopic composition and paleoclimatic significance of late Pleistocene carbonates, Ross Sea, Antarctica

    Energy Technology Data Exchange (ETDEWEB)

    Taviani, M. (Ist. per la Geologia Marina, Bologna (Italy)); Reid, D.E.; Anderson, J.B. (Rice Univ., Houston, TX (United States))

    1993-01-01

    Carbonates cover an extensive area of the northwestern Ross Sea continental shelf. Radiocarbon dates yield late Pleistocene (stage 3) ages for these deposits, hence the carbonates appear to be correlative with widespread tills and glacial marine deposits in the region. Four carbonate facies are recognized on the basis of skeletal composition: a barnacle/foraminifer facies, a muddy bryozoan facies, a bryozoan/barnacle/pelecypod/foraminifer facies, and a planktonic foraminiferal facies. These deposits occur on the shelf and upper slope, while carbonate turbidities derived from them occur on the adjacent continental slope and rise. Compositional analyses of Ross Sea carbonates lend support to previously recognized criteria for identifying cold water carbonates. These include: (1) the presence of an associated ice-rafted component (including dropstones); (2) a dominance of calcite relative to other carbonate minerals (the remaining fraction consists solely of aragonite); (3) allochems that are entirely skeletal; and (4) heavy oxygen isotopic compositions (in the range of +3.0 to +5.1% PDB).

  13. Krill distribution in relation to environmental parameters in mesoscale structures in the Ross Sea

    Science.gov (United States)

    Leonori, Iole; De Felice, Andrea; Canduci, Giovanni; Costantini, Ilaria; Biagiotti, Ilaria; Giuliani, Giordano; Budillon, Giorgio

    2017-02-01

    Krill, a key pelagic resource of the Antarctic food web, provides an important link between primary and secondary plankton production and top predators. Since krill abundance is a crucial factor in Antarctic ecosystem functioning, its monitoring supplies vital data. Acoustic surveys are an effective approach to estimating krill abundance. An acoustic survey was conducted in the western Ross Sea in January 2014-10 years after a similar survey by our team - to estimate krill abundance and biomass and monitor oceanographic conditions. Antarctic krill (Euphausia superba) was detected in the northern part of the western Ross Sea and dense swarms of ice krill (Euphausia crystallorophias) were found in its central coastal area. Data analysis revealed an inverse correlation between E. superba density and salinity in the water column, whereas a positive correlation was found between E. crystallorophias abundance and fluorescence; the latter relationship was confirmed in thematic maps of E. crystallorophias spatial distribution and fluorescence. Comparison of 2004 and 2014 biomass data showed a much greater abundance of both species in the more recent survey.

  14. Banking Competition and Efficiency: Empirical Analysis on the Bosnia and Herzegovina Using Panzar-Rosse Model

    Directory of Open Access Journals (Sweden)

    Memić Deni

    2015-03-01

    Full Text Available Background: Competition in the banking industry has been an important topic in the scientific literature as researchers tried to assess the level of competition in the banking sector. Objectives: This paper has an aim to investigate the market structure and a long term equilibrium of the banking market in Bosnia and Herzegovina nationwide as well as on its constitutional entities as well as to evaluate the monopoly power of banks during the years 2008-2012. Methods/Approach: The paper is examining the market structure using the most frequently applied measures of concentration k-bank concentration ratio (CRk and Herfindahl-Hirschman Index (HHI as well as evaluating the monopoly power of banks by employing Panzar-Rosse “H-statistic”. Results: The empirical results using CRk and HHI show that Bosnia and Herzegovina banking market has a moderately concentrated market with a concentration decreasing trend. The Panzar-Rosse “H-statistic” suggests that banks in Bosnia and Herzegovina operate under monopoly or monopolistic competition depending on the market segment. Conclusions: Banks operating on the banking market in Bosnia and Herzegovina seem to be earning their total and interest revenues under monopoly or perfectly collusive oligopoly.

  15. EFFECT OF BEE POLLEN DIETARY SUPPLEMENTATION ON MEAT PERFORMANCE OF ROSS 308 BROILER CHICKENS

    Directory of Open Access Journals (Sweden)

    Peter Haščík

    2015-02-01

    Full Text Available A present study was conducted to evaluate the effect of dietary inclusion of bee pollen extract on meat performance of Ross 308 broiler chickens. A total of 180 one day-old Ross chicks were involved in experiment. Chickens were divided into 2 groups, an experimental group (E and a control group (C. No added supplement was given to the control group, while the experimental group was given the feed mixture supplemented with bee pollen in an amount of 400 mg.kg-1, during the whole fattening period. Data of live body weight, carcass weight, giblets weight and carcass yield were determined at 42 days of the age. The supplementation of bee pollen increased final body weight of broilers by 68.5 g. Each of investigated parameters of meat performance in experimental group was higher to that in control group, although the difference among the groups was not statistically significant (P≥0.05. The addition of bee pollen at dose 400 mg.kg-1 in the feed mixture indicates the slight effect on meat performance of chickens which can be beneficial for fattening of broiler chickens.

  16. New age control on a mid-shelf grounding event in Eastern Basin, Ross Sea

    Science.gov (United States)

    Cone, A. N.; Bart, P. J.

    2009-12-01

    It is widely accepted that the West Antarctic Ice Sheet (WAIS) was grounded at the continental shelf edge in the eastern Ross Sea during the Last Glacial Maximum (LGM), but the precise chronology is debated. Post-LGM ice retreat chronologies have been developed using radiocarbon dating, mainly of acid-insoluble organics (AIO). Foraminifer tests yield more accurate radiocarbon dates than AIO because forams are less likely to be contaminated by allochthonous carbon, but unfortunately forams are sparse in Antarctic marine sediment cores. Here we show four consistent radiocarbon dates from forams in cored intervals within the foreset of a mid-continental-shelf grounding-zone wedge in Eastern Basin, Ross Sea. Our new radiocarbon dates reveal that the WAIS was grounded on the mid continental shelf circa 32,000 14C yr B.P., suggesting that retreat from this position began more than 10,000 years prior to the maximum sea level fall and global cooling associated with LGM. The dates contradict previous studies, which concluded that the WAIS was at its maximum shelf edge extent during LGM.

  17. Ross ice shelf cavity circulation, residence time, and melting: Results from a model of oceanic chlorofluorocarbons

    Science.gov (United States)

    Reddy, Tasha E.; Holland, David M.; Arrigo, Kevin R.

    2010-04-01

    Despite their harmful effects in the upper atmosphere, anthropogenic chlorofluorocarbons dissolved in seawater are extremely useful for studying ocean circulation and ventilation, particularly in remote locations. Because they behave as a passive tracer in seawater, and their atmospheric concentrations are well-mixed, well-known, and have changed over time, they are ideal for gaining insight into the oceanographic characteristics of the isolated cavities found under Antarctic ice shelves, where direct observations are difficult to obtain. Here we present results from a modeling study of air-sea chlorofluorocarbon exchange and ocean circulation in the Ross Sea, Antarctica. We compare our model estimates of oceanic CFC-12 concentrations along an ice shelf edge transect to field data collected during three cruises spanning 16 yr. Our model produces chlorofluorocarbon concentrations that are quite similar to those measured in the field, both in magnitude and distribution, showing high values near the surface, decreasing with depth, and increasing over time. After validating modeled circulation and air-sea gas exchange through comparison of modeled temperature, salinity, and chlorofluorocarbons with field data, we estimate that the residence time of water in the Ross Ice Shelf cavity is approximately 2.2 yr and that basal melt rates for the ice shelf average 10 cm yr -1. The model predicts a seasonal signature to basal melting, with highest melt rates in the spring and also the fall.

  18. Acoustic monitoring in the Ross Sea, Antarctica, using hydrophone of the Ocean Bottom Seismometer

    Science.gov (United States)

    Yun, Sukyoung; Lee, Won Sang; Kuk Hong, Jong; Yoo, Hyun Jae; Park, Yongcheol; Schmidt-Aursch, Mechita; Geissler, Wolfram H.

    2016-04-01

    Although a number of active source seismic experiments have been conducted over the last few decades to investigate the crustal structure in the Ross Sea, Antarctica, long-term observation to monitor underwater tectonic activities and changes in the cryospheric environment still remains challenging due to existence of sea ice in the study region. Korea Polar Research Institute has accomplished successful deployment of ocean bottom seismometers (OBS) in the Ross Sea collaborating with Alfred Wegener Institute during the period of 2011-2012 and 2014 by Korean icebreaker RV Araon. The OBS system manufactured by K.U.M. contains a hydrophone sensor that allow us to monitor underwater acoustics generated by tectonic and ice-related events. We present spectrograms of the continuous hydroacoustic data and various types of signals, e.g. seismic T-waves, iceequakes, and tremors. There are periodic and harmonic tremors that might be related with tidal modulation, and the seasonal variation of the background noise seems to be related with sea ice concentration.

  19. Increase of the Antarctic Sea Ice Extent is highly significant only in the Ross Sea

    Science.gov (United States)

    Yuan, Naiming; Ding, Minghu; Ludescher, Josef; Bunde, Armin

    2017-01-01

    In the context of global warming, the question of why Antarctic sea ice extent (SIE) has increased is one of the most fundamental unsolved mysteries. Although many mechanisms have been proposed, it is still unclear whether the increasing trend is anthropogenically originated or only caused by internal natural variability. In this study, we employ a new method where the underlying natural persistence in the Antarctic SIE can be correctly accounted for. We find that the Antarctic SIE is not simply short-term persistent as assumed in the standard significance analysis, but actually characterized by a combination of both short- and long-term persistence. By generating surrogate data with the same persistence properties, the SIE trends over Antarctica (as well as five sub-regions) are evaluated using Monte-Carlo simulations. It is found that the SIE trends over most sub-regions of Antarctica are not statistically significant. Only the SIE over Ross Sea has experienced a highly significant increasing trend (p = 0.008) which cannot be explained by natural variability. Influenced by the positive SIE trend over Ross Sea, the SIE over the entire Antarctica also increased over the past decades, but the trend is only at the edge of being significant (p = 0.034).

  20. Astronaut Ross Approaches Assembly Concept for Construction of Erectable Space Structure (ACCESS)

    Science.gov (United States)

    1999-01-01

    The crew assigned to the STS-61B mission included Bryan D. O'Conner, pilot; Brewster H. Shaw, commander; Charles D. Walker, payload specialist; mission specialists Jerry L. Ross, Mary L. Cleave, and Sherwood C. Spring; and Rodolpho Neri Vela, payload specialist. Launched aboard the Space Shuttle Atlantis November 28, 1985 at 7:29:00 pm (EST), the STS-61B mission's primary payload included three communications satellites: MORELOS-B (Mexico); AUSSAT-2 (Australia); and SATCOM KU-2 (RCA Americom). Two experiments were conducted to test assembling erectable structures in space: EASE (Experimental Assembly of Structures in Extravehicular Activity), and ACCESS (Assembly Concept for Construction of Erectable Space Structure). In a joint venture between NASA/Langley Research Center in Hampton, Virginia, and the Marshall Space Flight Center (MSFC), EASE and ACCESS were developed and demonstrated at MSFC's Neutral Buoyancy Simulator (NBS). In this STS-61B onboard photo, astronaut Ross, perched on the Manipulator Foot Restraint (MFR) approaches the erected ACCESS. The primary objective of these experiments was to test the structural assembly concepts for suitability as the framework for larger space structures and to identify ways to improve the productivity of space construction.

  1. The effect of propolis extract in the diet of chickens Ross 308 on their performance

    Directory of Open Access Journals (Sweden)

    PETER HACK

    2014-12-01

    Full Text Available The focus of the study was the performance of Ross 308 chickens after the application of propolis extract in their diet. The nutritional value of feed mixtures for chickens was equal, but the experimental groups were also added propolis extract in the dose of 200 mg.kg-1 (E1, 300 mg.kg-1 (E2 and 400 mg.kg-1 (E3, respectively. The results of the experiments showed that the propolis extract in the examined concentrations can be applied to the diet of chickens, since it managed to raise (P = 0.05 the body weight positively (E1 2354.60 g; E2 2371.40 g; E3 2382.90 g, compared to control group (2272.89 g. Total increase of body weights indicates positive tendency of propolis extract in the diet of chickens Ross 308, because higher values (P = 0.05 were reached in the experimental groups (2311.60 g E1 to 2339.60 g E3 compared to control (2230.80 g. Total feed consumption was higher in the experimental groups, on the contrary, FCR was lower (P = 0.05 in the experimental groups (1.64 to 1.67 compared to control (1.69. The best performance results were reached in the group with the greatest addition of propolis extract, i.e. in the dose 400 mg.kg-1 of feed mixtures (E3.

  2. Ross-Kabbani Operation in an Infant with Mitral Valve Dysplasia

    Directory of Open Access Journals (Sweden)

    Carlo Pace Napoleone

    2009-01-01

    Full Text Available Background. Mitral valve replacement can be very difficult to obtain in infants because the valve annulus diameter can be smaller than the available prosthesis. Case Report. We describe the case of a 2-month-old female weighing 3.5 kg affected by mitral valve dysplasia leading to severe valve stenosis. Despite full medication, the clinical conditions were critical and surgery was undertaken. The mitral valve was unsuitable for repair and the orifice of mitral anulus was 12 mm, too small for a mechanical prosthesis. Therefore, a Ross-Kabbani operation was undertaken, replacing the mitral valve with the pulmonary autograft and reconstructing the right ventricular outflow tract with an etherograft. Results. The postoperative course was uneventful and the clinical conditions are good at 4-month follow-up. Conclusion. The Ross-Kabbani operation can be an interesting alternative to mitral valve replacement in infants when valve repair is not achievable and there is little space for an intra-annular mechanical prosthesis implant.

  3. Inland diatoms from the McMurdo Dry Valleys and James Ross Island, Antarctica

    Science.gov (United States)

    Esposito, R.M.M.; Spaulding, S.A.; McKnight, Diane M.; Van De Vijver, B.; Kopalova, K.; Lubinski, D.; Hall, B.; Whittaker, T.

    2008-01-01

    Diatom taxa present in the inland streams and lakes of the McMurdo Dry Valleys and James Ross Island, Antarctica, are presented in this paper. A total of nine taxa are illustrated, with descriptions of four new species (Luticola austroatlantica sp. nov., Luticola dolia sp. nov., Luticola laeta sp. nov., Muelleria supra sp. nov.). In the perennially ice-covered lakes of the McMurdo Dry Valleys, diatoms are confined to benthic mats within the photic zone. In streams, diatoms are attached to benthic surfaces and within the microbial mat matrix. One species, L. austroatlantica, is found on James Ross Island, of the southern Atlantic archipelago, and the McMurdo Dry Valleys. The McMurdo Dry Valley populations are at the lower range of the size spectrum for the species. Streams flow for 6-10 weeks during the austral summer, when temperatures and solar radiation allow glacial ice to melt. The diatom flora of the region is characterized by species assemblages favored under harsh conditions, with naviculoid taxa as the dominant group and several major diatom groups conspicuously absent. ?? 2008 NRC.

  4. Climate change impacts on southern Ross Sea phytoplankton composition, productivity, and export

    Science.gov (United States)

    Kaufman, Daniel E.; Friedrichs, Marjorie A. M.; Smith, Walker O.; Hofmann, Eileen E.; Dinniman, Michael S.; Hemmings, John C. P.

    2017-03-01

    The Ross Sea, a highly productive region of the Southern Ocean, is expected to experience warming during the next century along with reduced summer sea ice concentrations and shallower mixed layers. This study investigates how these climatic changes may alter phytoplankton assemblage composition, primary productivity, and export. Glider measurements are used to force a one-dimensional biogeochemical model, which includes diatoms and both solitary and colonial forms of Phaeocystis antarctica. Model performance is evaluated with glider observations, and experiments are conducted using projections of physical drivers for mid-21st and late-21st century. These scenarios reveal a 5% increase in primary productivity by midcentury and 14% by late-century and a proportional increase in carbon export, which remains approximately 18% of primary production. In addition, scenario results indicate diatom biomass increases while P. antarctica biomass decreases in the first half of the 21st century. In the second half of the century, diatom biomass remains relatively constant and P. antarctica biomass increases. Additional scenarios examining the independent contributions of expected future changes (temperature, mixed layer depth, irradiance, and surface iron inputs from melting ice) demonstrate that earlier availability of low light due to reduction of sea ice early in the growing season is the primary driver of productivity increases over the next century; shallower mixed layer depths additionally contribute to changes of assemblage composition and export. This study further demonstrates how glider data can be effectively used to facilitate model development and simulation, and inform interpretation of biogeochemical observations in the context of climate change.Plain Language SummaryUnderstanding how the global ocean responds to climate change requires knowing the natural behavior of individual regions and anticipating how future changes will affect each region differently. It

  5. Operação de Ross com homoenxertos valvares decelularizados: resultados de médio prazo Ross Operation with decelularized pulmonary allografts: medium-term results

    Directory of Open Access Journals (Sweden)

    Francisco Costa

    2007-12-01

    Full Text Available OBJETIVO: Avaliar os resultados de médio prazo do uso de homoenxertos decelularizados na Operação de Ross. MÉTODOS: Entre janeiro de 2003 e fevereiro de 2007, 68 pacientes foram submetidos à Operação de Ross com homoenxertos decelularizados. Quarenta e oito pacientes eram do sexo masculino, com idade media de 30,3±11,2 anos. A decelularização foi feita com Ácido Deoxicólico (DOA, em 35 casos, e com Dodecilsulfato de Sódio (SDS, em 33. Para a comparação dos gradientes, foram selecionados 68 pacientes pareados pela idade, e que usaram homoenxertos criopreservados. Todos os pacientes realizaram ecocardiograma antes da alta e estão sendo avaliados anualmente. Oito pacientes tiveram controle por ressonância nuclear. Em dois pacientes reoperados, foi possível fazer análise histológica de um segmento do conduto pulmonar. RESULTADOS: Houve um (1,4% óbito imediato. Na evolução tardia, houve duas reoperações e um óbito. Os gradientes imediatos variaram de 4 a 29mmHg (m=10,3±5,5, e apresentaram elevação para 16,5± 12,2mmHg (min= 4, max = 45 aos 24 meses. Quando comparados com o grupo criopreservado, não houve diferenças significativas. Entretanto, houve tendência a melhores resultados em homoenxertos decelularizados com SDS após 12 meses de evolução. A análise histológica revelou reendotelização e repovoamento parcial da camada média com células autógenas. Não houve insuficiência pulmonar progressiva. Os dados de ressonância magnética demonstraram menor tendência de retração dos condutos decelularizados. CONCLUSÕES: O uso de homoenxertos decelularizados foi seguro, com bons resultados até quatro anos de evolução. Houve tendência a menores gradientes tardios nos homoenxertos decelularizados com SDS após 12 meses.OBJECTIVE: To evaluate the medium-term results (4 years of decelularized allografts during Ross Operation. METHODS: From January 2003 to February 2007, 68 patients underwent Ross Operation with

  6. Non-breeding Cackling, Ross's and Snow Geese on Baffin Island show no loss of body mass during wing moult

    DEFF Research Database (Denmark)

    Fox, Anthony David; Leafloor, James O.; Balsby, Thorsten Johannes Skovbjerg;

    2016-01-01

    Non-breeding Cackling Branta hutchinsii, Ross's Anser rossii and Lesser Snow Geese Anser caerulescens caerulescens captured during remigial moult on Baffin Island in 2015 showed no loss of body mass with moult stage, and individual variation in mass was largely explained by sex and measures of body...

  7. 78 FR 56944 - Strata Energy, Inc. (Ross In Situ Recovery Uranium Project); Notice of Atomic Safety and...

    Science.gov (United States)

    2013-09-16

    ... From the Federal Register Online via the Government Publishing Office NUCLEAR REGULATORY COMMISSION Strata Energy, Inc. (Ross In Situ Recovery Uranium Project); Notice of Atomic Safety and Licensing Board Reconstitution Pursuant to 10 CFR 2.313(c) and 2.321(b), the Atomic Safety and Licensing...

  8. Men of Good Will: The Religious Education Association, J. Elliot Ross, and the National Conference of Jews and Christians

    Science.gov (United States)

    Nolan, Lucinda A.

    2009-01-01

    An impetus of the Religious Education Association (REA) toward becoming an actively intercultural and interreligious agency emerged in the third decade of its existence. This article explores this period through an examination of the involvement of the REA members, Father John Elliot Ross and others (1884-1946) in a series of seminars conducted by…

  9. A New Analysis of the Two Classical ZZ Ceti White Dwarfs GD 165 and Ross 548. II. Seismic Modeling

    Science.gov (United States)

    Giammichele, N.; Fontaine, G.; Brassard, P.; Charpinet, S.

    2016-03-01

    We present the second of a two-part seismic analysis of the bright, hot ZZ Ceti stars GD 165 and Ross 548. In this second part, we report the results of detailed searches in parameter space for identifying an optimal model for each star that can account well for the observed periods, while being consistent with the spectroscopic constraints derived in our first paper. We find optimal models for each target that reproduce the six observed periods well within ∼0.3% on the average. We also find that there is a sensitivity on the core composition for Ross 548, while there is practically none for GD 165. Our optimal model of Ross 548, with its thin envelope, indeed shows weight functions for some confined modes that extend relatively deep into the interior, thus explaining the sensitivity of the period spectrum on the core composition in that star. In contrast, our optimal seismic model of its spectroscopic sibling, GD 165 with its thick envelope, does not trap/confine modes very efficiently, and we find weight functions for all six observed modes that do not extend into the deep core, hence accounting for the lack of sensitivity in that case. Furthermore, we exploit after the fact the observed multiplet structure that we ascribe to rotation. We are able to map the rotation profile in GD 165 (Ross 548) over the outermost ∼20% (∼5%) of its radius, and we find that the profile is consistent with solid-body rotation.

  10. Coping with Dying: Lessons That We Should and Should Not Learn from the Work of Elisabeth Kubler-Ross.

    Science.gov (United States)

    Corr, Charles A.

    1993-01-01

    Appraises work of Elisabeth Kubler-Ross in area of coping with dying. Suggests lessons from that work. Draws broad conclusions about processes involved in coping with dying, argues on behalf of need to develop better theoretical models to explicate what is involved in coping with dying, and suggests requirements for model. (Author/NB)

  11. An examination of the role of colonial Phaeocystis antarctica in the microbial food web of the Ross Sea

    Science.gov (United States)

    The extensive buildup of phytoplankton biomass in the Ross Sea conflicts with the view that high rates of herbivory occur in all regions of the Southern Ocean. Nano- and microplanktonic consumers comprise a significant fraction of total plankton biomass; however, the importance o...

  12. Mg/Casea surface temperatures during the Marine Isotope Stage 31 collapse of the Ross Ice Shelf

    Science.gov (United States)

    Dunbar, G. B.

    2012-04-01

    The recovery of the AND-1b and CRP-1 drill cores from the Southwest Ross Sea highlighted the potential instability in of the Ross Ice Shelf and the West Antarctic Ice Sheet it buttresses. Both cores recovered a few individuals of the planktonic foraminifera Neogloboquadrina pachyderma from marine isotope stage (MIS) 31. This interval is significant because it marks the youngest occurrence of open ocean diatom sediment at AND-1b, which is now situated under the McMurdo Ice Shelf, indicating a substantial retreat of the Ross Ice Shelf occurred during this interglacial. However, sediment deposited after MIS 31 at both sites is represented only by glacial-dominated sediment, suggesting a critical environmental threshold had been crossed enabling the Ross Ice Shelf to form and persist. Numerical modeling by Pollard and DeConto (Nature, 2009) suggested that sub-ice oceanic melting is a critical element in the stability of ice shelves and that "WAIS will begin to collapse when nearby ocean temperatures warm by roughly 5°C." Laser ablation ICPMS measurement of the Mg/Ca content of N. pachyderma shows that although there is considerable heterogeneity in the distribution of Mg in their tests the mean Mg/Ca of a sample population appears proportional to calcification temperature. By empirically calibrating Mg/Ca in CRP-1 N. pachyderma against values measured in modern populations collected from Ross Sea and Southern Ocean sites with SSTs ranging from 1.2°C to 14°C it is concluded that SST during MIS 31 was warmer than today by 5-9°C, consistent with model projections.

  13. Dilatation and Dysfunction of the Neo-aortic Root and in 76 Patients After the Ross Procedure.

    Science.gov (United States)

    Zimmermann, Corina A; Weber, Roland; Greutmann, Matthias; Dave, Hitendu; Müller, Christoph; Prêtre, René; Seifert, Burkhardt; Buechel, Emanuela Valsangiacomo; Kretschmar, Oliver; Attenhofer Jost, Christine H

    2016-08-01

    Pulmonary autograft replacement (Ross procedure) is used as an alternative to prosthetic aortic valve replacement patients with aortic valve disease. There are limited data on incidence and risk factors for dilatation and dysfunction of the neo-aortic after the Ross procedure. Ross procedure was performed in 100 patients at our institution between 1993 and 2011. In 76 patients, complete follow-up data were available. Their median age at surgery was 16 (0.4-58) years (76 % males; 95 % with congenital aortic valve disease). Median follow-up duration was 5.2 years (0.3-16.0 years). We analyzed their clinical and echocardiographic follow-up to identify possible risk factors for neo-aortic root dilatation and dysfunction. Ross procedure included reduction plasty of the native ascending aorta in 25 % of patients. During follow-up, 21 patients (28 %) developed neo-aortic root dilatation, 38 patients (50 %) dilatation oft the native ascending aorta and 7 patients (9 %) at least moderate neo-aortic regurgitation. Univariate risk factors for neo-aortic root dilatation were preoperative aortic regurgitation (p = 0.04), concomitant reduction plasty of the ascending aorta (p = 0.009) and a longer duration of follow-up (p = 0.005). Younger age at surgery was associated with dilatation of the ascending aorta (p = 0.03). Reoperation on the neo-aortic root because of severe dilatation was necessary in 6 patients (8 %), where 2 patients had at least moderate neo-aortic root regurgitation. Neo-aortic root and aortic dilatation are common after the Ross procedure. This is often combined with neo-aortic valve dysfunction. Close follow-up of these patients is mandatory.

  14. Cenozoic geodynamics of the Ross Sea region, Antarctica: Crustal extension, intraplate strike-slip faulting, and tectonic inheritance

    Science.gov (United States)

    Salvini, Francesco; Brancolini, Giuliano; Busetti, Martina; Storti, Fabrizio; Mazzarini, Francesco; Coren, Franco

    1997-11-01

    An integrated study of onshore and offshore geology of the Ross Sea region (namely, Victoria Land, north of Ross Island, and the Ross Sea, Antarctica) has revealed a complex, post-Eocene tectonic framework. Regional NW-SE right-lateral, strike-slip faults are the outstanding feature of this framework and overprint an older Mesozoic extensional event, responsible for formation of N-S basins in the Ross Sea. The Cenozoic framework includes kinematic deformation and reactivation along the NW-SE faults, including formation of pull-apart basins, both positive and negative flower structures, and push-up ridges. N-S extensional faults are well developed between NW-SE faults and indicate E-W extension during the Cenozoic, produced by the NW-SE right-lateral strike-slip motion together with regional crustal extension. NNW-SSE compression, induced by the right-lateral, strike-slip kinematics, is indicated by locally inverted NE-SW faults and basins. The evolution, geometry, and location of the Rennick Graben and the Lanterman Range fit well into this model. Variations in the deformational style across the region can be linked to corresponding variations in the bulk crustal rheology, from brittle behavior in the west, to ductile deformation (at subseismic-scale resolution) near the Eastern Basin. A semibrittle region that favors N-S clustering of Cenozoic magmatic activity lies in between. In this region, Cenozoic volcanoes develop at the intersections of the NW-SE and the major N-S faults. The NW-SE faults cut almost continually from the Ross Sea to East Antarctica through lithospheric sectors with different rheology and thickness. At least two of the NW-SE faults correspond to older Paleozoic terrane boundaries in northern Victoria Land. The NW-SE faults link in the Southern Ocean with major transform faults related to the plate motions of Australia, New Zealand, and Antarctica.

  15. Iron limitation of a springtime bacterial and phytoplankton community in the Ross Sea: implications for vitamin B12 nutrition

    Directory of Open Access Journals (Sweden)

    Erin M. Bertrand

    2011-08-01

    Full Text Available The Ross Sea is home to some of the largest phytoplankton blooms in the Southern Ocean. Primary production in this system has previously been shown to be iron limited in the summer and periodically iron and vitamin B12 colimited. In this study, we examined trace metal limitation of biological activity in the Ross Sea in the austral spring and considered possible implications for vitamin B12 nutrition. Bottle incubation experiments demonstrated that iron limited phytoplankton growth in the austral spring while B12, cobalt, and zinc did not. This is the first demonstration of iron limitation in a Phaeocystis antarctica-dominated, early season Ross Sea phytoplankton community. The lack of B12 limitation in this location is consistent with previous Ross Sea studies in the austral summer, wherein vitamin additions did not stimulate P. antarctica growth and B12 was limiting only when bacterial abundance was low. Bottle incubation experiments and a bacterial regrowth experiment also revealed that iron addition directly enhanced bacterial growth. B12 uptake measurements in natural water samples and in an iron fertilized bottle incubation demonstrated that bacteria serve not only as a source for vitamin B12, but also as a significant sink, and that iron additions enhanced B12 uptake rates in phytoplankton but not bacteria. Additionally, vitamin uptake rates did not become saturated upon the addition of up to 95 pM B12. A rapid B12 uptake rate was observed after 13 min, which then decreased to a slower constant uptake rate over the next 52 hours. Results from this study highlight the importance of iron availability in limiting early season Ross Sea phytoplankton growth and suggest that rates of vitamin B12 production and consumption may be impacted by iron availability.

  16. Measurement of competitiveness degree in Tunisian deposit banks: An application of the Panzar and Rosse model

    Directory of Open Access Journals (Sweden)

    Mensi Sami

    2010-01-01

    Full Text Available This paper explores the use of the Panzar-Rosse statistic as a basis for empirical assessment of competitive conditions among Tunisian deposit banks. The elaborated model has been tested with an interest revenues equation and a total revenues equation. Proceeding by means of an Ordinary Least Square analysis, the H-statistics is respectively estimated at 0.87 and 0.91. The computations undertaken using bank fixed effects and bank random effects General Least Square methods yield similar results. With reference to the reviewed literature, we are inclined to believe that Tunisian banks implement neither a joint monopoly nor a collusive competition context, and that they evolve within an oligopolistic competition context in a contestable market. Thus, it confirms the presence of a competitive environment.

  17. Epidemiologic Patterns of Ross River Virus Disease in Queensland, Australia, 2001–2011

    Science.gov (United States)

    Yu, Weiwei; Mengersen, Kerrie; Dale, Pat; Mackenzie, John S.; Toloo, Ghasem (Sam); Wang, Xiaoyu; Tong, Shilu

    2014-01-01

    Ross River virus (RRV) infection is a debilitating disease that has a significant impact on population health, economic productivity, and tourism in Australia. This study examined epidemiologic patterns of RRV disease in Queensland, Australia, during January 2001–December 2011 at a statistical local area level. Spatio-temporal analyses were used to identify the patterns of the disease distribution over time stratified by age, sex, and space. The results show that the mean annual incidence was 54 per 100,000 persons, with a male:female ratio of 1:1.1. Two space-time clusters were identified: the areas adjacent to Townsville, on the eastern coast of Queensland, and the southeast areas. Thus, although public health intervention should be considered across all areas in which RRV occurs, it should specifically focus on high-risk regions, particularly during summer and autumn to reduce the social and economic impacts of RRV infection. PMID:24799374

  18. Changes in sea-ice cover and temperature in the Western Ross Sea during the Holocene

    Science.gov (United States)

    Fleury, Sophie; Kim, Jung-Hyun; Gal, Jong-Ku; Mezgec, Karin; Belt, Simon; Smik, Lukas; Stenni, Barbara; Melis, Romana; Crosta, Xavier; Shin, Kyung-Hoon

    2016-04-01

    Although changes in sea-ice cover contribute to global climatic variations, they are poorly constrained for periods earlier than the last decades. More records are especially required around Antarctica, where the formation of Antarctic Bottom Waters participates to global thermohaline circulation. However, this region provided only a few marine sediment cores spanning the entire Holocene, especially because of generally low sedimentation rates. This study focuses on marine sediment core ANTA99-CJ5 (73°49'S; 175°39'E), located in the open sea ice zone (OSIZ) of the western Ross Sea. We analyzed several lipid biomarkers: highly branched isoprenoids (HBIs), sterols, diols and GDGTs. The combination of several biomarkers and the comparison of these results with a diatom record previously published on the same core enabled us to trace past changes in temperatures as well as in sea-ice condition over the last 11,600 years.

  19. Environmental drivers of Ross River virus in southeastern Tasmania, Australia: towards strengthening public health interventions.

    Science.gov (United States)

    Werner, A K; Goater, S; Carver, S; Robertson, G; Allen, G R; Weinstein, P

    2012-02-01

    In Australia, Ross River virus (RRV) is predominantly identified and managed through passive health surveillance. Here, the proactive use of environmental datasets to improve community-scale public health interventions in southeastern Tasmania is explored. Known environmental drivers (temperature, rainfall, tide) of the RRV vector Aedes camptorhynchus are analysed against cumulative case records for five adjacent local government areas (LGAs) from 1993 to 2009. Allowing for a 0- to 3-month lag period, temperature was the most significant driver of RRV cases at 1-month lag, contributing to a 23·2% increase in cases above the long-term case average. The potential for RRV to become an emerging public health issue in Tasmania due to projected climate changes is discussed. Moreover, practical outputs from this research are proposed including the development of an early warning system for local councils to implement preventative measures, such as public outreach and mosquito spray programmes.

  20. High basal melting forming a channel at the grounding line of Ross Ice Shelf, Antarctica

    Science.gov (United States)

    Marsh, Oliver J.; Fricker, Helen A.; Siegfried, Matthew R.; Christianson, Knut; Nicholls, Keith W.; Corr, Hugh F. J.; Catania, Ginny

    2016-01-01

    Antarctica's ice shelves are thinning at an increasing rate, affecting their buttressing ability. Channels in the ice shelf base unevenly distribute melting, and their evolution provides insight into changing subglacial and oceanic conditions. Here we used phase-sensitive radar measurements to estimate basal melt rates in a channel beneath the currently stable Ross Ice Shelf. Melt rates of 22.2 ± 0.2 m a-1 (>2500% the overall background rate) were observed 1.7 km seaward of Mercer/Whillans Ice Stream grounding line, close to where subglacial water discharge is expected. Laser altimetry shows a corresponding, steadily deepening surface channel. Two relict channels to the north suggest recent subglacial drainage reorganization beneath Whillans Ice Stream approximately coincident with the shutdown of Kamb Ice Stream. This rapid channel formation implies that shifts in subglacial hydrology may impact ice shelf stability.

  1. Influence of submarine morphology on bottom water flow across the western Ross Sea continental margin

    Science.gov (United States)

    Davey, F.J.; Jacobs, S.S.

    2007-01-01

    Multibeam sonar bathymetry documents a lack of significant channels crossing outer continental shelf and slope of the western Ross Sea. This indicates that movement of bottom water across the shelf break into the deep ocean in this area is mainly by laminar or sheet flow. Subtle, ~20 m deep and up to 1000 m wide channels extend down the continental slope, into tributary drainage patterns on the upper rise, and then major erosional submarine canyons. These down-slope channels may have been formed by episodic pulses of rapid down slope water flow, some recorded on bottom current meters, or by sub-ice melt water erosion from an icesheet grounded at the margin. Narrow, mostly linear furrows on the continental shelf thought to be caused by iceberg scouring are randomly oriented, have widths generally less than 400 m and depths less than 30m, and extend to water depths in excess of 600 m.

  2. Snow chemistry measurements on James Ross Island (Antarctic Peninsula) showing sea-salt aerosol modifications

    Energy Technology Data Exchange (ETDEWEB)

    Aristarain, A.J. [Instituto Antartico Argentino (Argentina). Lab. de Estratigrafia Glaciar y Geoquimica de la Nieve; Consejo Nacional de Investigaciones Cientificas y Tecnicas, Mendoza (Argentina); Delmas, R.J. [Laboratoire de Glaciologie et Geophysique de l' Environnement du CNRS, St Martin d' Heres (France)

    2002-07-01

    The fractionation of atmospheric sea-salt has been investigated by glaciochemical analysis of the sea-salt deposited on the snow covering the small ice cap of James Ross Island, Antarctic Peninsula, at an elevation of 1640m. The data show that, generally, but not always, the sea-salt deposited at this location most likely originates directly from seawater, as is the case at lower latitudes. It is found that the original chemical composition of the sea-salt aerosol is significantly modified, in particular by the reaction of sea-salt particles in the atmosphere with acid species. A ternary diagram (sodium, chloride, sulfate) is used to enlighten the involved modification processes. The study points out the frequent formation of HCl in the regional atmosphere. (Author)

  3. The Dehumanizing American Dream in David Mamet’s Glengarry Glen Ross

    Directory of Open Access Journals (Sweden)

    Mehdi Sepehrmanesh

    2014-01-01

    Full Text Available The American Dream is a recurrent theme in American literature. In this response, this paper is an attempt to expose the destructive effects of the dream on the human spirit. It is also shown, through the analysis of David Mamet’s glengarry Glen Ross, that despite the promise of the dream it contains many contradictions. Beneath the seeming simple surface of the play lies a deep current of meanings that reflect the calamities of modern American life, and in a broader sense, the modern world. This article indicates how capitalism inculcates ideologies in the mind of individuals in order to facilitate the exploiting process and unquestioning subordination. Ragged individualism, for instance, as  the most prominent of these ideologies, disrupts all communal bonds and even exceeds to the disintegration of friendship and family life.

  4. Epidemiologic patterns of Ross River virus disease in Queensland, Australia, 2001-2011.

    Science.gov (United States)

    Yu, Weiwei; Mengersen, Kerrie; Dale, Pat; Mackenzie, John S; Toloo, Ghasem Sam; Wang, Xiaoyu; Tong, Shilu

    2014-07-01

    Ross River virus (RRV) infection is a debilitating disease that has a significant impact on population health, economic productivity, and tourism in Australia. This study examined epidemiologic patterns of RRV disease in Queensland, Australia, during January 2001-December 2011 at a statistical local area level. Spatio-temporal analyses were used to identify the patterns of the disease distribution over time stratified by age, sex, and space. The results show that the mean annual incidence was 54 per 100,000 persons, with a male:female ratio of 1:1.1. Two space-time clusters were identified: the areas adjacent to Townsville, on the eastern coast of Queensland, and the southeast areas. Thus, although public health intervention should be considered across all areas in which RRV occurs, it should specifically focus on high-risk regions, particularly during summer and autumn to reduce the social and economic impacts of RRV infection. © The American Society of Tropical Medicine and Hygiene.

  5. Sustainable Seas Student Monitoring Project at the Branson School in Ross, CA

    Science.gov (United States)

    Rainsford, A.; Soave, K.; Costolo, R.; Kudler, J.; Emunah, M.; Hatfield, J.; Kiyasu, J.

    2015-12-01

    Alina Rainsford, Kathy Soave, Julia Kudler, Jane Hatfield, Melea Emunah, Rose Costelo, Jenna Kiyasu, Amy Dean and Sustainable Seas Monitoring Project, Branson School, Ross, CA, United States, Farallones Marine Sanctuary Association, San Francisco, CA, United StatesAbstract:The Sustainable Seas Student Monitoring Project at the Branson School in Ross, CA has monitored Duxbury Reef in Bolinas, CA since 1999, in cooperation with the Farallones Marine Sanctuary Association and the Gulf of Farallones National Marine Sanctuary. Goals of this student-run project include: 1) To monitor the rocky intertidal habitat and develop a baseline database of invertebrates and algal density and abundance; 2) To contribute to the conservation of the rocky intertidal habitat through education of students and visitors about intertidal species; 3) To increase stewardship in the Gulf of the Farallones National Marine Sanctuary; and 4) To contribute abundance and population data on key algae and invertebrate species to the national database, LiMPETS (Long Term Monitoring Program & Experiential Training for Students). Each fall student volunteers complete an intensive training course on the natural history of intertidal invertebrates and algae, identification of key species, rocky intertidal monitoring techniques, and history of the sanctuary. Students identify and count key invertebrate and algae species along two permanent transects and, using randomly determined points, within two permanent 200 m2 areas, in fall, winter, and late spring. Using data from the previous years, we will compare population densities, seasonal abundance and long-term population trends of key algal and invertebrate species, including Tegula funebralis, Anthopluera elegantissima, Cladophora sp. and Fucus sp.. Future analyses and investigations will include intertidal abiotic factors (including water temperature, pH and human foot-traffic) to enhance insights into the Duxbury Reef ecosystem, in particular, the high

  6. The Ross Procedure in Patients among the Pediatric Population, Post Ten Years of Experience

    Directory of Open Access Journals (Sweden)

    Andrey A. Ivanov

    2013-09-01

    Full Text Available The aim of the study was to analyze the results of the surgical treatment in pediatric patients who had undergone the Ross procedure.Material and Methods: The study involved 114 patients between 12 days to 18 years in age. The early and late (up to 5 years results of the treatment were studied. The examination included echocardiography, catheterization of the cardiac chambers and angiocardiography. The case distribution of patients based on diagnosis was as follows: isolated aortic valve stenosis (IAVS in 38 (33.3% patients, aortic valve insufficiency (AVI in 33 (28.9%, and combined heart defects in 56 patients (49.1%.Results: The death rate was 6.14% during the early postoperative period and 1.14% in the late postoperative period; the actuarial survival in the long-term was 98.86%. The complication rate was 51.5%. The most frequent complication was pericarditis (25.6%, whereas cardiac and respiratory failure occurred in 7.6% of the cases and cardiac arrhythmias in 6.1% of the cases. The average time spent in the intensive care unit was 3.48 ± 2.90 days; the hospitalization period on average was 24.70±10.87 days. After surgery, there was a tendency of the echocardiographic parameters to move toward normalization. The frequency of reoperation in the late period was 23.7%, the main reason for which being the conduit dysfunction in the position of the pulmonary artery (PA.Conclusion: The clinical efficacy of the Ross procedure in the treatment of aortic valve malformations in the pediatric group was confirmed. However, in some cases, the need to perform repeated operations due to the increase in the ring size and an increase in the neo-aortic insufficiency during the somatic growth process.

  7. Ross Sea Polynyas: Response of Ice Concentration Retrievals to Large Areas of Thin Ice

    Science.gov (United States)

    Kwok, R.; Comiso, J. C.; Martin, S.; Drucker, R.

    2007-01-01

    For a 3-month period between May and July of 2005, we examine the response of the Advanced Microwave Scanning Radiometer (AMSR-E) Enhanced NASA Team 2 (NT2) and AMSR-E Bootstrap (ABA) ice concentration algorithms to large areas of thin ice of the Ross Sea polynyas. Coincident Envisat Synthetic Aperture Radar (SAR) coverage of the region during this period offers a detailed look at the development of the polynyas within several hundred kilometers of the ice front. The high-resolution imagery and derived ice motion fields show bands of polynya ice, covering up to approximately 105 km(sup 2) of the Ross Sea, that are associated with wind-forced advection. In this study, ice thickness from AMSR-E 36 GHz polarization information serves as the basis for examination of the response. The quality of the thickness of newly formed sea ice (<10 cm) from AMSR-E is first assessed with thickness estimates derived from ice surface temperatures from the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument. The effect of large areas of thin ice in lowering the ice concentration estimates from both NT2/ABA approaches is clearly demonstrated. Results show relatively robust relationships between retrieved ice concentrations and thin ice thickness estimates that differ between the two algorithms. These relationships define the approximate spatial coincidence of ice concentration and thickness isopleths. Using the 83% (ABA) and 91% (NT2) isopleths as polynya boundaries, we show that the computed coverage compares well with that using the estimated 10-cm thickness contour. The thin ice response characterized here suggests that in regions with polynyas, the retrieval results could be used to provide useful geophysical information, namely thickness and coverage.

  8. Temporal variability of the Circumpolar Deep Water inflow onto the Ross Sea continental shelf

    Science.gov (United States)

    Castagno, Pasquale; Falco, Pierpaolo; Dinniman, Michael S.; Spezie, Giancarlo; Budillon, Giorgio

    2017-02-01

    The intrusion of Circumpolar Deep Water (CDW) is the primary source of heat, salt and nutrients onto Antarctica's continental shelves and plays a major role in the shelf physical and biological processes. Different studies have analyzed the processes responsible for the transport of CDW across the Ross Sea shelf break, but until now, there are no continuous observations that investigate the timing of the intrusions. Also, few works have focused on the effect of the tides that control these intrusions. In the Ross Sea, the CDW intrudes onto the shelf in several locations, but mostly along the troughs. We use hydrographic observations and a mooring placed on the outer shelf in the middle of the Drygalski Trough in order to characterize the spatial and temporal variability of CDW inflow onto the shelf. Our data span from 2004 to the beginning of 2014. In the Drygalski Trough, the CDW enters as a 150 m thick layer between 250 and 400 m, and moves upward towards the south. At the mooring location, about 50 km from the shelf break, two main CDW cores can be observed: one on the east side of the trough spreading along the west slope of Mawson Bank from about 200 m to the bottom and the other one in the central-west side from 200 m to about 350 m depth. A signature of this lighter and relatively warm water is detected by the instruments on the mooring at bottom of the Drygalski Trough. High frequency periodic CDW intrusion at the bottom of the trough is related to the diurnal and spring/neap tidal cycles. At lower frequency, a seasonal variability of the CDW intrusion is noticed. A strong inflow of CDW is observed every year at the end of December, while the CDW inflow is at its seasonal minimum during the beginning of the austral fall. In addition an interannual variability is also evident. A change of the CDW intrusion before and after 2010 is observed.

  9. Investigations of the tropospheric halogen chemistry around Ross Island, Antarctica, during austral spring 2012

    Science.gov (United States)

    Zielcke, Johannes; Pöhler, Denis; Frieß, Udo; Hay, Tim; Kreher, Karin; Kalnajs, Lars; Platt, Ulrich

    2013-04-01

    A unique feature of the polar troposphere is the strong impact of halogen photochemistry, in which reactive halogen species (RHS) are responsible for ozone depletion as well as the oxidation of elemental mercury and dimethyl sulphide. The source, however, as well as release and recycling mechanisms of these halogen species are far from being completely understood, especially the role of chlorine and iodine compounds. Reactive chlorine, bromine and iodine compounds are thought to be released from sea salt particles or produced by the photolysis of halocarbons and I2 emitted by the ocean. Here we present observations of halogen oxides, ozone and nitrogen dioxide conducted for three months during austral spring 2012 on Ross Island, Antarctica. Measurements were performed with a suite of remote sensing instruments. An active long-path differential optical absorption spectroscopy (LP-DOAS) system was set up, measuring several species (BrO, O3, NO2, OBrO, IO, OIO, I2, ClO, OClO, CHOCHO, HCHO, HONO) continuously for the whole period, with two light paths over first year sea ice. In addition, a passive MAX-DOAS as well as a new Cavity-Enhanced (CE)-DOAS system were used for mobile halogen oxide measurements on a variety of locations around Ross Island (sea ice, shelf ice, snow, coastal, etc.), with top surface layer pH measurements performed at the different measurement sites. First results show highly variable ozone concentrations including partial Ozone Depletion Events (ODEs), as well as concentrations of BrO up to 16ppt and NO2 up to 15ppb. Suprisingly, a high variation of ozone was observed without significant amounts of BrO, indicating already depleted air masses transported to the measurement site and/or NOx chemistry inhibiting halogen radical reactions.

  10. Evaluación del efecto de microorganismos eficientes en agua de bebida suministrada a pollos Ross X Ross en la granja Tunguavita

    Directory of Open Access Journals (Sweden)

    Suren Angélica García-Vera

    2011-02-01

    Full Text Available El uso  de Microorganismos  Eficientes  (ME  en avicultura permite  aumentar  la productividad  y rentabilidad, además de mejorar las condiciones sanitarias de  la producción, convirtiéndolos en una técnica de suplementación sencilla, que permite optimizar  los  recursos para  el mejoramiento de las explotaciones avícolas. Con el fin de evaluar el  efecto de  los ME  sobre  algunos  parámetros productivos, se realizó este trabajo con pollos de engorde de la raza Ross X Ross. Se seleccionaron de  forma  aleatoria  90  aves,  las  cuales  fueron divididas  en  tres  grupos,  con  tres  repeticiones, respectivamente.  Al  tratamiento  uno  se  les administró ME durante  toda  la producción, a razón de 1 mL por cada 2.000 mL de agua (semanas 1, 7, 8 y 1mL por cada 1.000 mL de agua (semanas 2-6. Al  tratamiento  dos  se  les  administró ME durante toda la producción, a razón de 5 mL por cada 2.000 mL de agua (semanas 1, 7, 8 y 5 mL por  cada  1.000 mL  de  agua  (semanas 2-6.  El tratamiento  tres  correspondió  al  tratamiento control. Se realizó pesaje y recolección de heces cada  semana,  durante  las  8  semanas  de  la producción y se comprobó que en los grupos en los  que  se  usó ME  se  produjo  un  aumento significativo de conversión alimenticia y, por  lo tanto, de ganancia de peso en comparación con el  tratamiento control; en cuanto la concentración amoniacal en heces, ésta disminuyó notablemente en los tratamientos 1 ý 2.

  11. ROSS: The Remotely-Operated Surface Sampler - A MediumEndurance, Precision-Navigated Platform Optimized for Uncontaminated Measurement of Upper-Ocean Velocity, Density and Turbulence

    Science.gov (United States)

    2015-09-30

    ROSS : The Remotely-­‐Operated Surface Sampler A medium-­‐endurance, precision-­‐navigated  platform optimized...coas.oregonstate.edu Award N00014-­‐14-­‐1-­‐0490 http://kai.coas.oregonstate.edu/ OVERVIEW The Remotely Operated Surface   Sampler ( ROSS )  is an  open...configuration,   ROSS cruises at 4 knots,  is equipped  with  300 kHz  and 2 MHz  ADCPs,  and tows a 20-­‐m  lon thermistor/CTD  chain. Its

  12. Soil thermal regime on ice-free areas in Livingston Island and James Ross Island, Antarctic Peninsula region

    Science.gov (United States)

    Hrbáček, Filip; Oliva, Marc; Láska, Kamil; Ruiz-Fernández, Jesús; Ángel de Pablo, Miguel; Vieira, Gonçalo; Ramos, Miguel; Nývlt, Daniel

    2016-04-01

    Permafrost and active layer are considered prominent components of the Cryosphere, which react very sensitively to small climate variations. The Antarctic Peninsula (AP) region is considered as one of the fastest warming regions on Earth, where mean annual air temperature locally increased more than 2.5°C over the last 60 years. Significant climate differences are found between the eastern and western sides of the AP. While mean annual air temperatures (MAAT) oscillate around -1 to -2 °C and precipitation reach 800 mm w.e. year-1 in the western AP, the MAAT in the eastern AP are below -6 °C and precipitation does not exceed 500 mm. These differences determine different permafrost thickness and spatial distribution in these two regions, as well as diverse patterns of active layer dynamics. With the purpose to better understand the factors controlling the soil thermal regime in maritime permafrost environments, we examine data from 2014 acquired from several sites in Livingston Island (western AP) and James Ross Island (eastern AP). The study sites show similar characteristics in terms of topography (slope Ross Island ranged from -7.0 to -7.9 °C. Mean soil temperature at 5 cm depth was slightly higher than air temperature in both areas: -0.7 to -1.3 °C in Livingston Island and -6.2 to -6.3 °C in James Ross Island; the same occurred for soil temperature at 75 cm: -0.4 to -0.7 °C in Livingston Island and -6.0 to -6.6 °C James Ross Island. Significantly lower values of mean daily amplitude of soil temperature at 5 cm depth and the freezing n-factor values observed during the freezing season on Livingston Island suggest a pronounced insulating effect of snow cover in this area in comparison to James Ross Island. The mean daily amplitude of soil temperature at 5 cm ranged from 0.9 to 1.7 °C in Livingston Island, while it reached 3.0 to 4.0 °C in James Ross Island. The freezing n-factor reached 0.33 and 0.63 on Livingston Island, while 0.88 and 0.98 were

  13. Katherine Bonil Gómez. Gobierno y calidad en el orden colonial. Las categorías del mestizaje en la provincia de Mariquita en la segunda mitad del siglo XVIII

    Directory of Open Access Journals (Sweden)

    Heraclio Bonilla Mayta

    2012-06-01

    Full Text Available Normal 0 21 false false false ES-CO X-NONE X-NONE MicrosoftInternetExplorer4 El libro reciente de Katherine Bonil, historiadora de la Universidad de los Andes, es una importante contribución al conocimiento de la formación de las identidades étnicas, en este caso en el contexto de Mariquita en el siglo XVIII. El papel que tuvieron los grupos de poder local en esa definición es sin duda central, como lo reconoce, con razón la autora.; aunque no es menos importante saber que esas identidades no se construyeron solo de manera vertical, sino en la interacción cotidiana de grupos que compartieron una misma posición, aunque separados y opuestos por razones raciales y culturales. Pese a que Mariquita tuvo una población india originaria relativamente pequeña, no hay que olvidar que durante el auge de la actividad minera en el siglo XVII fue el centro de movilización compulsiva, la así llamada “mita” neogranadina, de cientos de nativos procedentes de Santafé de Bogotá y de Tunja para extraer el metal de sus socavones. /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

  14. Temperature profile data collected using CTD casts from the JAMES CLARK ROSS in the South Atlantic Ocean from 15 November 1996 to 20 November 1996 (NODC Accession 0000874)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile data were collected using CTD casts in the South Atlantic Ocean from JAMES CLARK ROSS. Data were collected from 15 November 1996 to 20 November...

  15. Temperature profile data collected using CTD casts from the JAMES CLARK ROSS in the South Atlantic Ocean from 15 November 1994 to 21 November 1994 (NODC Accession 0000873)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile data were collected using CTD casts in the South Atlantic Ocean from JAMES CLARK ROSS. Data were collected from 15 November 1994 to 21 November...

  16. "All this that has happened to me shouldn't happen to nobody else": Loretta Ross and the Women of Color Reproductive Freedom Movement of the 1980s.

    Science.gov (United States)

    Nelson, Jennifer

    2010-01-01

    Loretta Ross exemplifies women of color feminist participation in and transformation of the women's health movement of the 1970s and 1980s. Ross helped build a women's health movement that by the late 1980s made the demands of women of color central. This movement was attractive to many women of color who had rejected the collapse of a broader women's health movement into the abortion rights movement as too narrowly focused. Many women of color activists, including Ross, argued that the emphasis on abortion rights and choice failed to address the linked socioeconomic and community health issues confronted by many women of color and poor women. Ross's work spurred coalition building among white women and women of color that focused on expanding reproductive justice and women's health beyond legal abortion. By the 1990s these efforts had produced a vibrant and engaged feminist reproductive justice movement that promoted the socioeconomics of good health for all women.

  17. Obituary: Elizabeth Katherine Holmes, 1973-2004

    Science.gov (United States)

    Beichman, Charles Arnold

    2004-12-01

    Elizabeth (Beth) K. Holmes died suddenly in Pasadena on March 23, 2004, from the unexpected effects of a long-standing heart condition. She was 30 years old. At the moment of her passing, she was at her computer comparing her theoretical models on the effects of planets on the distribution of zodiacal dust with some of the first observations from the Spitzer Space Telescope. Born on June 24, 1973, in New York City, Beth was the only child of James and Barbara Holmes, who were respectively, a financial manager and a nurse and social worker. Undeterred by numerous treatments and operations to correct a congenital heart condition, Beth developed an interest in math and physics leading to her graduation from MIT in 1995 with a bachelor's degree in Physics. She entered the University of Florida shortly afterwards to begin her PhD studies under the direction of Stanley Dermott. Beth was particularly interested in the dynamics of interplanetary dust, and initially worked on secular perturbations of the zodiacal cloud: how the planets impose warping of the cloud, and how they can force the center of the cloud to be offset from the Sun. Despite the fact that Beth was primarily a theorist, she was keen to include some observing experience in her PhD education. She recently completed an observing program with Harold Butner at the Steward and Palomar Observatories looking for submillimeter and mid-infrared emission around nearby main-sequence stars - a signpost of planetary formation. The results were published last year in the Astronomical Journal. Beth's PhD thesis work, some results of which were recently published in the Astrophysical Journal, focused on dust originating in the Kuiper belt and how some of this dust is expected to be spatially structured due to resonant interactions with Neptune. This phenomenon may be quite common in other planetary systems, with recent images of Epsilon Eridani perhaps providing a prime example of a Kuiper disk analog. After graduating from Florida in 2002, Beth took up a National Research Council postdoctoral position at the Jet Propulsion Laboratory with Charles Beichman and T. Velusamy with the goal of applying her theoretical knowledge of zodiacal clouds to observations from the Spitzer Space telescope. In advance of the launch of Spitzer, Beth gathered detailed information on over 150 solar type stars and carefully planned a Spitzer observing program to detect faint zodiacal signals. While waiting through numerous launch delays, she prepared models of zodiacal clouds influenced by the presence of planets to be ready when Spitzer images of stars like Vega, Upsilon Andromedae, and Fomalhaut became available. These models were presented as talks and posters at a number of conferences. Her models were a critical part of the Early Release Observations of Fomalhaut and the subsequent Spitzer paper on the possibility that a Jovian-mass planet located approximately 40 AU from the star was responsible for the structures seen in the Fomalhaut disk. The Fomalhaut paper in the special Spitzer edition of the Astrophysical Journal is dedicated to Beth's memory. Beth was an enthusiastic and cheerful colleague who made friends everywhere she worked. In addition to developing friendships and collaborations at JPL, she became a valued member of the Spitzer/MIPS instrument team at the University of Arizona. She was active on the Committee on the Status of Women in Astronomy of the American Astronomical Society, publishing an article on "The Postdoc Perspective on the Women in Astronomy II Conference" in the January 2004 issue of STATUS, the CSWA magazine, and serving as an associate editor of that magazine. She was an inspiring role model for young women in science, befriending and mentoring a number of Caltech women undergraduates, as well as making numerous appearances in K-12 classrooms for science outreach. She pursued her love of plants (cactus in particular), cats and fish, spending her spare time lovingly tending her small garden. Her friends and colleagues will remember Beth for her scientific contributions, but also for her courage as we realize that she worked beside us completely unshadowed by the heart condition that would take her in so sudden and untimely a manner. We take solace in the knowledge that at the moment of her passing, she was pursuing her passion for astronomy, working among colleagues who valued her work and her friendship, that she had a supportive and loving family with parents on the East Coast and close relatives on the West Coast, and that in her fiancé, Todd Rope, she had found a kindred spirit.

  18. Detrital dating on drill-core records from McMurdo Sound, Ross Sea (Antarctica)

    Science.gov (United States)

    Zattin, M.; Andreucci, B.; Balestrieri, M.; Olivetti, V.; Pace, D.; Reiners, P. W.; Rossetti, F.; Talarico, F.; Thomson, S. N.

    2012-12-01

    The influence of Antarctic ice sheets on the global climate system during the Cenozoic has been intensely investigated in the last years, especially after the successful drilling projects off-shore the western Ross Sea. While the role of the Western Ice Sheet (WAIS) during the Miocene it is not clear, the East Antarctic Ice Sheet (EAIS) has been suggested to be more or less stable and cold for the last 14 Ma. Records from drilling projects in syn-tectonic basins located on the continental shelf along the western margin of the West Antarctica Rift System (DSDP, CIROS, CRP and ANDRILL projects) may provide crucial information on the tectonic and paleo-climatic evolution of that region during Cenozoic. The drilled sedimentary records have been therefore investigated by detrital geochronology which, integrated by sandstone and gravel petrography, can provide valuable information on the dynamics of the ice sheets as provenance data are sensitive to variations in the ice-flow patterns. Apatite fission-track (AFT) data from ANDRILL and CRP records show multiple peaks in most of the samples. In the AND-2A well, whose stratigraphic record spans the last 20 Ma, the grain-age distributions are dominated by grains between 20 and 40 Ma. A young peak with a comparable age has been also episodically detected in CRP wells where conversely the most relevant population is made by grain ages between 45 and 70 Ma. Samples from Late Miocene-Pleistocene sediments of AND-1B well show a completely different AFT age distribution as a single peak is usually detected and ages are younger than 20 Ma. The AFT age range is well represented in bedrock data along the entire Transantarctic Mountains (TAM). The main denudation phase in the TAM began at 55-50 Ma but the occurrence of a young peak in the detrital data at ca. 35 Ma indicates the presence of an Oligocene pulse, as testified also by the small gap between AFT and some (U-Th-Sm)/He ages that have been detected on AND-2A samples. Such

  19. 共同拓展交流新领域——访加拿大外交部Ross Hornby助理副部长

    Institute of Scientific and Technical Information of China (English)

    陶红

    2005-01-01

    日前,本刊记者采访了加拿大外交部主管政策公共外交的Ross Hornby助理副部长。Ross Homby助理副部长是应中国社会科学院邀请,前来参加该院“第三届国际土著——少数民族研讨会”的。

  20. Ice core reconstruction of sea ice change in the Amundsen-Ross Seas since 1702 A.D.

    Science.gov (United States)

    Thomas, Elizabeth R.; Abram, Nerilie J.

    2016-05-01

    Antarctic sea ice has been increasing in recent decades, but with strong regional differences in the expression of sea ice change. Declining sea ice in the Bellingshausen Sea since 1979 (the satellite era) has been linked to the observed warming on the Antarctic Peninsula, while the Ross Sea sector has seen a marked increase in sea ice during this period. Here we present a 308 year record of methansulphonic acid from coastal West Antarctica, representing sea ice conditions in the Amundsen-Ross Sea. We demonstrate that the recent increase in sea ice in this region is part of a longer trend, with an estimated ~1° northward expansion in winter sea ice extent (SIE) during the twentieth century and a total expansion of ~1.3° since 1702. The greatest reconstructed SIE occurred during the mid-1990s, with five of the past 30 years considered exceptional in the context of the past three centuries.

  1. Colonial Fantasies, Narrative Borders, and the Canadian North in the Works of Germany's Colin Ross(1885-1945

    Directory of Open Access Journals (Sweden)

    Nicole Pissowotzki

    2009-03-01

    Full Text Available This paper argues that the Canadian North is a discursive construction, within which German colonial fantasies emerge. In particular, I argue that it is through bordering that colonial fantasies of German Lebensraum ("living space" in the Canadian North are brought into being. I further argue that the German biologist and geographer Friedrich Ratzel (1844-1904, with his view of the "organic state," provides the ideological framework for colonial fantasies in the travel writings of Colin Ross.I focus on the writer's colonial imagination and his perception of borders, and on how both relate to the Canadian North. I show that seemingly bare geographical information and demographical data, provided in Ross' travelogues, carry colonial fantasies of German spaces in the Canadian North. Those spaces are bordered by "shared histories" and "narrative boundaries," thus constructing a collective German colonial identity (cf. Eder 2006, 255-257.

  2. Unravelling textural heterogeneity in obsidian: Shear-induced outgassing in the Rocche Rosse flow

    Science.gov (United States)

    Shields, J. K.; Mader, H. M.; Caricchi, L.; Tuffen, H.; Mueller, S.; Pistone, M.; Baumgartner, L.

    2016-01-01

    Obsidian flow emplacement is a complex and understudied aspect of silicic volcanism. Of particular importance is the question of how highly viscous magma can lose sufficient gas in order to erupt effusively as a lava flow. Using an array of methods we study the extreme textural heterogeneity of the Rocche Rosse obsidian flow in Lipari, a 2 km long, 100 m thick, ~ 800 year old lava flow, with respect to outgassing and emplacement mechanisms. 2D and 3D vesicle analyses and density measurements are used to classify the lava into four textural types: 'glassy' obsidian ( 40% vesicles), high aspect ratio, 'shear banded' lava (20-40% vesicles) and low aspect ratio, 'frothy' obsidian with 30-60% vesicles. Textural heterogeneity is observed on all scales (m to μm) and occurs as the result of strongly localised strain. Magnetic fabric, described by oblate and prolate susceptibility ellipsoids, records high and variable degrees of shearing throughout the flow. Total water contents are derived using both thermogravimetry and infrared spectroscopy to quantify primary (magmatic) and secondary (meteoric) water. Glass water contents are between 0.08-0.25 wt.%. Water analysis also reveals an increase in water content from glassy obsidian bands towards 'frothy' bands of 0.06-0.08 wt.%, reflecting preferential vesiculation of higher water bands and an extreme sensitivity of obsidian degassing to water content. We present an outgassing model that reconciles textural, volatile and magnetic data to indicate that obsidian is generated from multiple shear-induced outgassing cycles, whereby vesicular magma outgasses and densifies through bubble collapse and fracture healing to form obsidian, which then re-vesiculates to produce 'dry' vesicular magma. Repetition of this cycle throughout magma ascent results in the low water contents of the Rocche Rosse lavas and the final stage in the degassing cycle determines final lava porosity. Heterogeneities in lava rheology (vesicularity, water

  3. A NEW ANALYSIS OF THE TWO CLASSICAL ZZ CETI WHITE DWARFS GD 165 AND ROSS 548. II. SEISMIC MODELING

    Energy Technology Data Exchange (ETDEWEB)

    Giammichele, N.; Fontaine, G.; Brassard, P. [Département de Physique, Université de Montréal, Montréal, QC H3C 3J7 (Canada); Charpinet, S. [Université de Toulouse, UPS-OMP, IRAP, Toulouse F-31400 (France)

    2016-03-15

    We present the second of a two-part seismic analysis of the bright, hot ZZ Ceti stars GD 165 and Ross 548. In this second part, we report the results of detailed searches in parameter space for identifying an optimal model for each star that can account well for the observed periods, while being consistent with the spectroscopic constraints derived in our first paper. We find optimal models for each target that reproduce the six observed periods well within ∼0.3% on the average. We also find that there is a sensitivity on the core composition for Ross 548, while there is practically none for GD 165. Our optimal model of Ross 548, with its thin envelope, indeed shows weight functions for some confined modes that extend relatively deep into the interior, thus explaining the sensitivity of the period spectrum on the core composition in that star. In contrast, our optimal seismic model of its spectroscopic sibling, GD 165 with its thick envelope, does not trap/confine modes very efficiently, and we find weight functions for all six observed modes that do not extend into the deep core, hence accounting for the lack of sensitivity in that case. Furthermore, we exploit after the fact the observed multiplet structure that we ascribe to rotation. We are able to map the rotation profile in GD 165 (Ross 548) over the outermost ∼20% (∼5%) of its radius, and we find that the profile is consistent with solid-body rotation.

  4. ADI FD schemes for the numerical solution of the three-dimensional Heston-Cox-Ingersoll-Ross PDE

    Science.gov (United States)

    Haentjens, Tinne

    2012-09-01

    This paper deals with the numerical solution of the time-dependent, three-dimensional Heston-Cox-Ingersoll- Ross PDE, with all correlations nonzero, for the fair pricing of European call options. We apply a finite difference dis-cretization on non-uniform spatial grids and then numerically solve the semi-discrete system in time by using an Alternating Direction Implicit scheme. We show that this leads to a highly efficient and stable numerical solution method.

  5. 40Ar-39Ar Age Constraints on Volcanism and Tectonism in the Terror Rift of the Ross Sea, Antarctica

    Science.gov (United States)

    2007-01-01

    Volcanic sills and dikes inferred from seismic reflection profiles and geophysical studies of the Ross Sea are thought to be related to the rift basins in the region, and their emplacement to be coeval with extension. However, lack of precise geochronology in the Terror Rift of the Ross Sea region has left these inferred relationships poorly constrained and has hindered neotectonic studies, because of the large temporal gaps between seismic reflectors of known ages. New 40Ar/39Ar geochronology presented here for submarine volcanic rocks provides better age constraints for neotectonic interpretations within the Terror Rift. Several samples from seamounts yielded young ages between 156 ± 21 and 122 ± 26 Ka. These ages support interpretations that extension within the Terror Rift was active at least through the Pleistocene. Three evenly spaced samples from the lowermost 100 m of Franklin Island range in age from 3.28 ± 0.04 to 3.73 ± 0.05 Ma. These age determinations demonstrate that construction of a small volcanic edifice such as Franklin Island took at least several hundred thousand years, and therefore that much larger ones in the Erebus Volcanic Province are likely to have taken considerably longer than previously inferred. This warrants caution in applying a limited number of age determinations to define the absolute ages of events in the Ross Sea region

  6. From warm to cold: migration of Adélie penguins within Cape Bird, Ross Island

    Science.gov (United States)

    Nie, Yaguang; Sun, Liguang; Liu, Xiaodong; Emslie, Steven D.

    2015-06-01

    Due to their sensitivity to environmental change, penguins in Antarctica are widely used as bio-indicators in paleoclimatic research. On the basis of bio-element assemblages identified in four ornithogenic sediment profiles, we reconstructed the historical penguin population change at Cape Bird, Ross Island, for the past 1600 years. Clear succession of penguin population peaks were observed in different profiles at about 1400 AD, which suggested a high probability of migration within this region. The succession was most obviously marked by a sand layer lasting from 1400 to 1900 AD in one of the analyzed profiles. Multiple physical/chemical parameters indicated this sand layer was not formed in a lacustrine environment, but was marine-derived. Both isostatic subsidence and frequent storms under the colder climatic condition of the Little Ice Age were presumed to have caused the abandonment of the colonies, and we believe the penguins migrated from the coastal area of mid Cape Bird northward and to higher ground as recorded in the other sediment profiles. This migration was an ecological response to global climate change and possible subsequent geological effects in Antarctica.

  7. Shallow marine sedimentation within an active margin basin, James Ross Island, Antarctica

    Science.gov (United States)

    Pirrie, Duncan

    1989-06-01

    The Santa Marta Formation exposed on northern James Ross Island, Antarctica, represents shallow marine shelf sedimentation within an active margin basin. The formation is approximately 1000 m thick, is of uppermost Santonian to Campanian age and represents part of a 5000-6000 m thick sedimentary sequence forming the Larsen Basin. The Larsen Basin represents either a back-arc basin, or a half-graben basin, developed on the extending margin of the Weddell Sea. Twelve sedimentary facies have been recognised, which can be subdivided into two groups: those which are controlled by shelf processes and those which are related to active arc volcanism. Background shelf processes include fair-weather suspension sedimentation, storm sands and rare tidal current reworking. Active arc processes include direct settling of airfall detritus and rapid resedimentation of volcaniclastic detritus by sandy debris-flows and both high- and low-concentration turbidity currents. In addition sheet conglomerates represent debris flows that evolved from syn-sedimentary slumps. Two facies associations representing a mid to outer shelf and an inner shelf depositional setting respectively can be distinguished, with an apparent regression in the ?mid to late Campanian.

  8. Water mass dynamics shape Ross Sea protist communities in mesopelagic and bathypelagic layers

    Science.gov (United States)

    Zoccarato, Luca; Pallavicini, Alberto; Cerino, Federica; Fonda Umani, Serena; Celussi, Mauro

    2016-12-01

    Deep-sea environments host the largest pool of microbes and represent the last largely unexplored and poorly known ecosystems on Earth. The Ross Sea is characterized by unique oceanographic dynamics and harbors several water masses deeply involved in cooling and ventilation of deep oceans. In this study the V9 region of the 18S rDNA was targeted and sequenced with the Ion Torrent high-throughput sequencing technology to unveil differences in protist communities (>2 μm) correlated with biogeochemical properties of the water masses. The analyzed samples were significantly different in terms of environmental parameters and community composition outlining significant structuring effects of temperature and salinity. Overall, Alveolata (especially Dinophyta), Stramenopiles and Excavata groups dominated mesopelagic and bathypelagic layers, and protist communities were shaped according to the biogeochemistry of the water masses (advection effect and mixing events). Newly-formed High Salinity Shelf Water (HSSW) was characterized by high relative abundance of phototrophic organisms that bloom at the surface during the austral summer. Oxygen-depleted Circumpolar Deep Water (CDW) showed higher abundance of Excavata, common bacterivores in deep water masses. At the shelf-break, Antarctic Bottom Water (AABW), formed by the entrainment of shelf waters in CDW, maintained the eukaryotic genetic signature typical of both parental water masses.

  9. Snow on the Ross Ice Shelf: comparison of reanalyses and observations from automatic weather stations

    Directory of Open Access Journals (Sweden)

    L. Cohen

    2013-03-01

    Full Text Available An analysis of precipitation from the ECMWF ERA-Interim and NCEP/NCAR Reanalysis-2 datasets is developed using snow accumulation measurements from Automatic Weather Stations (AWS around the Ross Ice Shelf (RIS, Antarctica. The high temporal resolution of the AWS snow accumulation measurements allow for a new, event-based comparison of reanalyses precipitation to in-situ observations. Snow accumulation records from nine AWS provide multiple years of accumulation data between 2008–2012 over a relatively large, homogeneous region of Antarctica and provide the basis for a statistical evaluation of accumulation events. The analysis shows that ERA-Interim reproduces significantly more precipitation events than NCEP-2 and these events correspond to an average 8.2% more precipitation. Correlations between reanalyses and AWS event sizes are seen at several stations (at > 90% significance levels and show that ERA-Interim consistently produces larger precipitation events than NCEP-2. The significant and complex effects of wind on snow accumulation (which can both limit and enhance accumulation make determining biases in the reanalyses data not possible with the AWS data, however the analysis does illustrate significant and important differences between ERA-Interim and NCEP-2 precipitation.

  10. Molecular evolutionary dynamics of Ross River virus and implications for vaccine efficacy.

    Science.gov (United States)

    Jones, Anita; Lowry, Kym; Aaskov, John; Holmes, Edward C; Kitchen, Andrew

    2010-01-01

    Ross River virus (RRV) is a mosquito-borne member of the genus Alphavirus that causes epidemic polyarthritis in humans, costing the Australian health system at least US$10 million annually. Recent progress in RRV vaccine development requires accurate assessment of RRV genetic diversity and evolution, particularly as they may affect the utility of future vaccination. In this study, we provide novel RRV genome sequences and investigate the evolutionary dynamics of RRV from time-structured E2 gene datasets. Our analysis indicates that, although RRV evolves at a similar rate to other alphaviruses (mean evolutionary rate of approx. 8x10(-4) nucleotide substitutions per site year(-1)), the relative genetic diversity of RRV has been continuously low through time, possibly as a result of purifying selection imposed by replication in a wide range of natural host and vector species. Together, these findings suggest that vaccination against RRV is unlikely to result in the rapid antigenic evolution that could compromise the future efficacy of current RRV vaccines.

  11. Climate variability and Ross River virus infections in Riverland, South Australia, 1992-2004.

    Science.gov (United States)

    Bi, P; Hiller, J E; Cameron, A S; Zhang, Y; Givney, R

    2009-10-01

    Ross River virus (RRV) infection is the most common notifiable vector-borne disease in Australia, with around 6000 cases annually. This study aimed to examine the relationship between climate variability and notified RRV infections in the Riverland region of South Australia in order to set up an early warning system for the disease in temperate-climate regions. Notified data of RRV infections were collected by the South Australian Department of Health. Climatic variables and monthly river flow were provided by the Australian Bureau of Meteorology and South Australian Department of Water, Land and Biodiversity Conservation over the period 1992-2004. Spearman correlation and time-series-adjusted Poisson regression analysis were performed. The results indicate that increases in monthly mean minimum and maximum temperatures, monthly total rainfall, monthly mean Southern Oscillation Index and monthly flow in the Murray River increase the likelihood, but an increase in monthly mean relative humidity decreases the likelihood, of disease transmission in the region, with different time-lag effects. This study demonstrates that a useful early warning system can be developed for local regions based on the statistical analysis of readily available climate data. These early warning systems can be utilized by local public health authorities to develop disease prevention and control activities.

  12. Climate variation and incidence of Ross river virus in Cairns, Australia: a time-series analysis.

    Science.gov (United States)

    Tong, S; Hu, W

    2001-12-01

    In this study we assessed the impact of climate variability on the Ross River virus (RRv) transmission and validated an epidemic-forecasting model in Cairns, Australia. Data on the RRv cases recorded between 1985 and 1996 were obtained from the Queensland Department of Health. Climate and population data were supplied by the Australian Bureau of Meteorology and the Australian Bureau of Statistics, respectively. The cross-correlation function (CCF) showed that maximum temperature in the current month and rainfall and relative humidity at a lag of 2 months were positively and significantly associated with the monthly incidence of RRv, whereas relative humidity at a lag of 5 months was inversely associated with the RRv transmission. We developed autoregressive integrated moving average (ARIMA) models on the data collected between 1985 to 1994, and then validated the models using the data collected between 1995 and 1996. The results show that the relative humidity at a lag of 5 months (p rainfall at a lag of 2 months (p < 0.05) appeared to play significant roles in the transmission of RRv disease in Cairns. Furthermore, the regressive forecast curves were consistent with the pattern of actual values.

  13. The nepheloid bottom layer and water masses at the shelf break of the western Ross Sea

    Science.gov (United States)

    Capello, Marco; Budillon, Giorgio; Cutroneo, Laura; Tucci, Sergio

    2009-06-01

    In the austral summers of 2000/2001 and 2002/2003 the Italian CLIMA Project carried out two oceanographic cruises along the northwestern margin of the Ross Sea, where the Antarctic Bottom Water forms. Here there is an interaction between the water masses on the sea floor of the outer shelf and slope with a consequent evolution of benthic nepheloid layers and an increase in total particulate matter. We observed three different situations: (a) the presence of triads (bottom structures characterized by a concomitant jump in turbidity, temperature, and salinity data) and high re-suspension phenomena related to the presence of the Circumpolar Deep Water and its mixing with cold, salty shelf waters associated with gravity currents; (b) the absence of triads with high re-suspension, implying that when the gravity currents are no longer active the benthic nepheloid layer may persist until the suspended particles settle to the sea floor, suggesting that the turbidity data can be used to study recent gravity current events; and (c) the absence of turbidity and sediment re-suspension phenomena supports the theory that a steady situation had been re-established and the current interaction no longer occurred or had finished sometime before.

  14. Freshwater mineral nitrogen and essential elements in autotrophs in James Ross Island, West Antarctica

    Directory of Open Access Journals (Sweden)

    Coufalík Pavel

    2016-12-01

    Full Text Available The lakes and watercourses are habitats for various communities of cyanobacteria and algae, which are among the few primary producers in Antarctica. The amount of nutrients in the mineral-poor Antarctic environment is a limiting factor for the growth of freshwater autotrophs in most cases. In this study, the main aim was to assess the availability of mineral nitrogen for microorganisms in cyanobacterial mats in James Ross Island. The nitrate and ammonium ions in water environment were determined as well as the contents of major elements (C, N, P, S, Na, K, Ca, Mg, Al, Fe, Mn in cyanobacterial mats. The molar ratios of C:N, C:P and N:P in mats were in focus. The growth of freshwater autotrophs seems not to be limited by the level of nitrogen, according to the content of available mineral nitrogen in water and the biogeochemical stoichiometry of C:N:P. The source of nutrients in the Ulu Peninsula is not obvious. The nitrogen fixation could enhance the nitrogen content in mats, which was observed in some samples containing the Nostoc sp.

  15. Resonance vibrations of the Ross Ice Shelf and observations of persistent atmospheric waves

    Science.gov (United States)

    Godin, Oleg A.; Zabotin, Nikolay A.

    2016-10-01

    Recently reported lidar observations have revealed a persistent wave activity in the Antarctic middle and upper atmosphere that has no counterpart in observations at midlatitude and low-latitude locations. The unusual wave activity suggests a geographically specific source of atmospheric waves with periods of 3-10 h. Here we investigate theoretically the hypothesis that the unusual atmospheric wave activity in Antarctica is generated by the fundamental and low-order modes of vibrations of the Ross Ice Shelf (RIS). Simple models are developed to describe basic physical properties of resonant vibrations of large ice shelves and their coupling to the atmosphere. Dispersion relation of the long surface waves, which propagate in the floating ice sheet and are responsible for its low-order resonances, is found to be similar to the dispersion relation of infragravity waves in the ice-free ocean. The phase speed of the surface waves and the resonant frequencies determine the periods and wave vectors of atmospheric waves that are generated by the RIS resonant oscillations. The altitude-dependent vertical wavelengths and the periods of the acoustic-gravity waves in the atmosphere are shown to be sensitive to the physical parameters of the RIS, which can be difficult to measure by other means. Predicted properties of the atmospheric waves prove to be in a remarkable agreement with the key features of the observed persistent wave activity.

  16. Characteristics of the near-surface atmosphere over the Ross Ice Shelf, Antarctica

    Science.gov (United States)

    Cassano, John J.; Nigro, Melissa A.; Lazzara, Matthew A.

    2016-04-01

    Two years of data from a 30 m instrumented tower are used to characterize the near-surface atmospheric state over the Ross Ice Shelf, Antarctica. Stable stratification dominates the surface layer at this site, occurring 83% of the time. The strongest inversions occur for wind speeds less than 4 m s-1 and the inversion strength decreases rapidly as wind speed increases above 4 m s-1. In summer unstable stratification occurs 50% of the time and unstable conditions are observed in every season. A novel aspect of this work is the use of an artificial neural network pattern identification technique, known as self-organizing maps, to objectively identify characteristic potential temperature profiles that span the range of profiles present in the 2 year study period. The self-organizing map clustering technique allows the more than 100,000 observed potential temperature profiles to be represented by just 30 patterns. The pattern-averaged winds show distinct and physically consistent relationships with the potential temperature profiles. The strongest winds occur for the nearly well mixed but slightly stable patterns and the weakest winds occur for the strongest inversion patterns. The weakest wind shear over the depth of the tower occurs for slightly unstable profiles and the largest wind shear occurs for moderately strong inversions. Pattern-averaged log wind profiles are consistent with theoretical expectations. The log wind profiles exhibit a kinked profile for the strongest inversion cases indicative of decoupling of the winds between the bottom and top of the tower.

  17. Unusual biogenic calcite structures in two shallow lakes, James Ross Island, Antarctica

    Science.gov (United States)

    Elster, J.; Nedbalová, L.; Vodrážka, R.; Láska, K.; Haloda, J.; Komárek, J.

    2016-01-01

    The floors of two shallow endorheic lakes, located on volcanic surfaces on James Ross Island, are covered with calcareous organosedimentary structures. Their biological and chemical composition, lake water characteristics, and seasonal variability of the thermal regime are introduced. The lakes are frozen down to the bottom for 8-9 months a year and their water chemistry is characterised by low conductivity and neutral to slightly alkaline pH. The photosynthetic microbial mat is composed of filamentous cyanobacteria and microalgae that are considered to be Antarctic endemic species. The mucilaginous black biofilm is covered by green spots formed by a green microalga and the macroscopic structures are packed together with fine material. Thin sections consist of rock substrate, soft biofilm, calcite spicules and mineral grains originating from different sources. The morphology of the spicules is typical of calcium carbonate monocrystals having a layered structure and specific surface texture, which reflect growth and degradation processes. The spicules' chemical composition and structure correspond to pure calcite. The lakes' age, altitude, morphometry, geomorphological and hydrological stability, including low sedimentation rates, together with thermal regime predispose the existence of this community. We hypothesise that the precipitation of calcite is connected with the photosynthetic activity of the green microalgae that were not recorded in any other lake in the region. This study has shown that the unique community producing biogenic calcite spicules is quite different to any yet described.

  18. A modelling study of the hydrographic structure of the Ross Sea

    Directory of Open Access Journals (Sweden)

    M. Tonelli

    2012-11-01

    Full Text Available Dense water formation around Antarctica is recognized as one of the most important processes to climate modulation, since that is where the linkage between the upper and lower limbs of Global Thermohaline Circulation takes place. Assessing whether these processes may be affected by rapid climate changes and all the related feedbacks may be crucial to fully understand the ocean heat transport and to provide future projections. Applying the Coordinated Ocean-Ice Reference (CORE normal year forcing we have run a 100-yr simulation using Regional Ocean Model System (ROMS with explicit sea-ice/ice-shelf thermodynamics. The normal year consists of single annual cycle of all the data that are representative of climatological conditions over decades and can be applied repeatedly for as many years of model integration as necessary. The experiment employed a circumpolar variable resolution (1/2° to 1/24° grid reaching less than 5 km over the inner continental shelf. With Optimum Parameter Analysis (OMP the main Ross Sea (RS water masses are identified: Antarctic surface water (AASW, circumpolar deep water (CDW, shelf water (SW and ice shelf water (ISW. Current configuration allows very realistic representation, where results compare extremely well to the observations.

  19. Description of Pseudomonas gregormendelii sp. nov., a Novel Psychrotrophic Bacterium from James Ross Island, Antarctica.

    Science.gov (United States)

    Kosina, Marcel; Švec, Pavel; Černohlávková, Jitka; Barták, Miloš; Snopková, Kateřina; De Vos, Paul; Sedláček, Ivo

    2016-07-01

    During the microbiological research performed within the scope of activities of Czech expeditions based at the Johann Gregor Mendel Station at James Ross Island, Antarctica, two psychrotrophic gram-stain negative non-fluorescent strains CCM 8506T and CCM 8507 from soil were extensively characterized using genotypic and phenotypic methods. Initial characterization using ribotyping with HindIII restriction endonuclease and phenotyping implies that both isolates belong to a single Pseudomonas species. Sequencing of rrs, rpoB, rpoD and glnA genes of strain CCM 8506(T) confirmed affiliation of investigated strains within the genus Pseudomonas. Further investigation using automated ribotyping with EcoRI (RiboPrinter(®) Microbial Characterisation System), whole-cell protein profiling using the Agilent 2100 Bioanalyzer system, extensive biochemical testing and DNA-DNA hybridization experiments confirmed that both investigated strains are members of a single taxon which is clearly separated from all hitherto described Pseudomonas spp. Based on all findings, we describe a novel species Pseudomonas gregormendelii sp. nov. with the type strain CCM 8506(T) (=LMG 28632T).

  20. Antimicrobial Activity of Monoramnholipids Produced by Bacterial Strains Isolated from the Ross Sea (Antarctica

    Directory of Open Access Journals (Sweden)

    Pietro Tedesco

    2016-04-01

    Full Text Available Microorganisms living in extreme environments represent a huge reservoir of novel antimicrobial compounds and possibly of novel chemical families. Antarctica is one of the most extraordinary places on Earth and exhibits many distinctive features. Antarctic microorganisms are well known producers of valuable secondary metabolites. Specifically, several Antarctic strains have been reported to inhibit opportunistic human pathogens strains belonging to Burkholderia cepacia complex (Bcc. Herein, we applied a biodiscovery pipeline for the identification of anti-Bcc compounds. Antarctic sub-sea sediments were collected from the Ross Sea, and used to isolate 25 microorganisms, which were phylogenetically affiliated to three bacterial genera (Psychrobacter, Arthrobacter, and Pseudomonas via sequencing and analysis of 16S rRNA genes. They were then subjected to a primary cell-based screening to determine their bioactivity against Bcc strains. Positive isolates were used to produce crude extracts from microbial spent culture media, to perform the secondary screening. Strain Pseudomonas BNT1 was then selected for bioassay-guided purification employing SPE and HPLC. Finally, LC-MS and NMR structurally resolved the purified bioactive compounds. With this strategy, we achieved the isolation of three rhamnolipids, two of which were new, endowed with high (MIC < 1 μg/mL and unreported antimicrobial activity against Bcc strains.

  1. Antimicrobial Activity of Monoramnholipids Produced by Bacterial Strains Isolated from the Ross Sea (Antarctica) †

    Science.gov (United States)

    Tedesco, Pietro; Maida, Isabel; Palma Esposito, Fortunato; Tortorella, Emiliana; Subko, Karolina; Ezeofor, Chidinma Christiana; Zhang, Ying; Tabudravu, Jioji; Jaspars, Marcel; Fani, Renato; de Pascale, Donatella

    2016-01-01

    Microorganisms living in extreme environments represent a huge reservoir of novel antimicrobial compounds and possibly of novel chemical families. Antarctica is one of the most extraordinary places on Earth and exhibits many distinctive features. Antarctic microorganisms are well known producers of valuable secondary metabolites. Specifically, several Antarctic strains have been reported to inhibit opportunistic human pathogens strains belonging to Burkholderia cepacia complex (Bcc). Herein, we applied a biodiscovery pipeline for the identification of anti-Bcc compounds. Antarctic sub-sea sediments were collected from the Ross Sea, and used to isolate 25 microorganisms, which were phylogenetically affiliated to three bacterial genera (Psychrobacter, Arthrobacter, and Pseudomonas) via sequencing and analysis of 16S rRNA genes. They were then subjected to a primary cell-based screening to determine their bioactivity against Bcc strains. Positive isolates were used to produce crude extracts from microbial spent culture media, to perform the secondary screening. Strain Pseudomonas BNT1 was then selected for bioassay-guided purification employing SPE and HPLC. Finally, LC-MS and NMR structurally resolved the purified bioactive compounds. With this strategy, we achieved the isolation of three rhamnolipids, two of which were new, endowed with high (MIC < 1 μg/mL) and unreported antimicrobial activity against Bcc strains. PMID:27128927

  2. Tragic Heroines and Wise Women in the Novels of Somerville and Ross

    Directory of Open Access Journals (Sweden)

    Angela Ryan

    2005-03-01

    Full Text Available The novels of Somerville and Ross depict, behind their wit and social satire, a darker tragic vision in which class and gender overdetermine the outcomes often awaiting female characters. Even the heroines of relatively privileged background are vulnerable to change and insecurity. In The Real Charlotte the eponymous heroine’s intelligence and determination fail to guard her against the predicament of the ‘unmarriageable’ woman in the society of the period. Her strength of character, her capacity to foresee and influence events (like the archaic Irish or Greek Wise Woman figure turn to despair and damage to others. In The Silver Fox the outcomes are happier for the two heroines through the agency of another pre-Olympian tragic Wise Woman, herself the victim of tragic fate. In Sarah’s Youth, a notable example of Modernism in Irish writing, the Wise Woman figures are the heroine’s half-sister, and an older mentor-figure. Tragedy, engendered in the conflictual social-family nexus, is averted through the agency of foreknowledge, and a certain relative modernisation of society’s attitudes to (economically  independent women.

  3. Deuterium excess as a proxy for sea ice extent in the western Ross Sea, Antarctica, 1882-2006

    Science.gov (United States)

    Sinclair, K. E.; Bertler, N.; Zwartz, D.; Trompetter, B.; Millet, M.; Davy, P.

    2011-12-01

    Deuterium excess in a high-resolution ice core extracted from the Whitehall Glacier (WHG) is highly sensitive to sea ice extent since observations began in 1979. Seasonal sea ice extent has increased significantly in the Ross Sea since 1995, creating a dipole between the Ross Sea and the Amundsen and Bellinghausen Sea Coasts, which have experienced significant sea ice loss. The reasons for the spatial differences in sea ice anomalies is thought to be primarily related to the phase of the Southern Annular Mode (SAM), the primary climate driver in this sector of Antarctica, and the complex interactions of SAM with the El Niño-Southern Oscillation (ENSO). A positive phase of SAM leads to deeper low pressure anomalies in the Amundsen Sea; cooler and stronger southerly winds in the western Ross Sea, and wind-driven sea ice advance, particularly when it is reinforced by La Nina conditions. In the WHG ice core, deuterium excess has mean values of 9.5 per mil from 1979 until 1994 and 5.2 per mil after 1995. This ~5 per mil shift is concurrent with a change from negative to positive sea ice extent anomalies in the Ross Sea and a concurrent decrease in marine trace elements (Na, Mg, V, Rb). We argue that increased southerly winds since 1995 (related to a more positive SAM) have increased the area of the Ross Sea and Terra Nova Bay polynas resulting in increased sea ice extent. Because sea surface temperatures (SST) are very low over these polynas, particularly in the austral autumn and winter, the deuterium excess signal at the Whitehall Glacier is highly sensitive to the amount of local moisture input and the seasonality of this moisture contribution. Increased local moisture, with low SST, results in low deuterium excess and therefore an inverse relationship with sea ice extent. In the context of the 125-year span of the WHG record, (1882-2006), deuterium excess is markedly high (and sea ice coverage is therefore expected to have been anomalously low) in the 1950s, '60s

  4. Modelling of active layer thickness evolution on James Ross Island in 2006-2015

    Science.gov (United States)

    Hrbáček, Filip; Uxa, Tomáš

    2017-04-01

    Antarctic Peninsula region has been considered as one of the most rapidly warming areas on the Earth. However, the recent studies (Turner et al., 2016; Oliva et al., 2017) showed that significant air temperature cooling began around 2000 and has continued until present days. The climate cooling led to reduction of active layer thickness in several parts of Antarctic Peninsula region during decade 2006-2015, but the information about spatiotemporal variability of active layer thickness across the region remains largely incoherent due to lack of active layer temperature data from deeper profiles. Valuable insights into active layer thickness evolution in Antarctic Peninsula region can be, however, provided by thermal modelling techniques. These have been widely used to study the active layer dynamics in different regions of Arctic since 1990s. By contrast, they have been employed much less in Antarctica. In this study, we present our first results from two equilibrium models, the Stefan and Kudryavtsev equations, that were applied to calculate the annual active layer thickness based on ground temperature data from depth of 5 cm on one site on James Ross Island, Eastern Antarctic Peninsula, in period 2006/07 to 2014/15. Study site (Abernethy Flats) is located in the central part of the major ice-free area of James Ross Island called Ulu Peninsula. Monitoring of air temperature 2 m above ground surface and ground temperature in 50 cm profile began on January 2006. The profile was extended under the permafrost table down to 75 cm in February 2012, which allowed precise determination of active layer thickness, defined as a depth of 0°C isotherm, in period 2012 to 2015. The active layer thickness in the entire observation period was reconstructed using the Stefan and Kudryavtsev models, which were driven by ground temperature data from depth of 5 cm and physical parameters of the ground obtained by laboratory analyses (moisture content and bulk density) and calculations

  5. Monitoring of land-based glaciers on James Ross Island, Antarctic Peninsula

    Science.gov (United States)

    Laska, Kamil; Nyvlt, Daniel; Engel, Zbynek; Stachon, Zdenek

    2015-04-01

    Antarctic Peninsula has been considered one of the most rapidly warming parts of our planet during the second half of the 20th century. Therefore, James Ross Island located near the northern tip of the Antarctic Peninsula, represents a unique place to study the sensitivity of glacier systems to regional atmospheric warming. Since 2006, an integrated multidisciplinary study of glaciers and terrestrial ecosystems has been carried out in the northern part of Ulu Peninsula, James Ross Island. In this contribution, glacier monitoring network consisting of four dominant land-based glaciers at the Ulu Peninsula is presented. Davies Dome (DD) is an ice dome, which originates on the surface of a flat volcanic mesa at >400 m a.s.l. and terminates as a single 700 m wide outlet in Whisky Bay. In 2006, Davies Dome had an area of 6.5 km2 and lay in the altitude range 0-514 m a.s.l. Whisky Glacier (WG) is a cold-based land-terminating valley glacier, which is surrounded by an extensive area of debris-covered ice. WG covered an area of 2.4 km2 and ranged from 215 to 520 m a.s.l. Triangular Glacier (TG) is a southwest-facing land-terminating glacier with an area of 0.6 km2 ranging from 302 to 107 m a.s.l. with well-developed ice-cored terminal moraine. San Jose Glacier (SJG) is a south-facing land-terminating piedmont glacier rejuvenated from the above lying Lachman Crags Dome (~640 m a.s.l.). SJG covers an area of 0.6 km2 and extends between 138 and 310 m a.s.l. Moreover, monitoring network consists of five automatic weather stations (AWS) placed in the central and marginal parts of the selected glaciers. Each AWS was equipped with the EMS33 air temperature and humidity probes placed inside the radiation shields. Apart from that, additional instruments, e.g. albedometer, propeller anemometer, snow depth sensors were installed on the central part of DD and WG. Since 2009, annual mass balance measurements have been realized on the DD, WG and TG glaciers. In 2010, ice thickness and

  6. Biochemical and microbial features of shallow marine sediments along the Terra Nova Bay (Ross Sea, Antarctica)

    Science.gov (United States)

    Baldi, Franco; Marchetto, Davide; Pini, Francesco; Fani, Renato; Michaud, Luigi; Lo Giudice, Angelina; Berto, Daniela; Giani, Michele

    2010-09-01

    Shallow marine sediments were collected from seven stations (three of which located at Gerlache Inlet, two at Tethys Bay, one at Adelie Cove and one just beneath the Italian Research Base) along the Terra Nova Bay coast (Ross Sea, Antarctica). Their chemical, biochemical and microbiological properties were studied in order to provide further insights in the knowledge of this Antarctic benthic ecosystem. Overall, the organic carbon (OC) represented the major fraction of total carbon (TC) and displayed concentrations similar to or slightly lower than those previously measured in Antarctic bottom sediments. The biopolymeric carbon within OC ranged from 4.1% to 19.9% and showed a wide trophic range (65-834 μg g -1 d.w.). Proteins (PRT) represented on average the main biochemical class contributing to labile organic carbon, followed by lipids (LIP) and carbohydrates (CHO). The activity of aminopeptidase, β- D-glucosidase, alkaline phosphatase and esterase was checked, giving the highest values at Tethys Bay and at the deepest water sediments. The principal component analysis, which was computed considering physical, chemical (elemental and biochemical sedimentary composition) and microbiological parameters (including bacterial abundance, ectoenzymatic activities, T-RFs richness and diversity indices), allowed to obtain two main clusters ("Tethys Bay" and "other stations"). Based on data obtained, two representative 16S rRNA clone libraries using samples from Tethys Bay and Gerlache Inlet were constructed. The sequences of 171 clones were compared to those available in public databases to determine their approximate phylogenetic affiliations. Both aerobic and anaerobic bacteria were disclosed, with the majority of them affiliated with the Gamma- and Deltaproteobacteria, Bacteroidetes and Acidobacteria. The occurrence of strictly anaerobic bacteria suggests that sediments might also undergo anoxic conditions that, in turn, could favor the accumulation of PRT in respect

  7. [Dr. Elizabeth Ross: heroine and victim of the World War I in Serbia].

    Science.gov (United States)

    Mikić, Želimir; Lešić, Aleksandar

    2012-01-01

    At the beginning of 1915, several months after the World War I started, Serbia was in an extremely difficult situation.The country was war-ravaged, full of sick and wounded soldiers, there was a desperate shortage of doctors, nurses and other medical personnel, and the epidemic of typhus fever exploded and violently attacked the entire country. At that time, however, a number of both foreign allied medical missions and individual volunteers, from various countries, mostly from Great Britain, came to Serbia to help. Among them mostly were women, and they were of enormous support to Serbia in that grave situation. It is estimated that there were more than 600 foreign women volunteers in Serbia at that time and that 22 of them died there. Dr. Elizabeth Ross was one of those brave volunteers who came to Serbia early in 1915. That noble Scottish lady doctor was born in 1878 and finished her medical studies at the University of Glasgow in 1901. After graduation she worked in various places in Great Britain until 1909, when she went to Persia (Iran), where she worked until the beginning of the so called Great War. When she heard of the urgent need in Serbia she left Persia as soon as she could and volunteered to serve in Serbia. She came to Kragujevac at the beginning of January 1915, where she worked at the First Military Reserve Hospital, which at that time was actually a typhus hospital. Working there intensively and devotedly for several weeks under shocking conditions she contracted typhus herself and died there on her 37th birthday on February 14th, 1915. She was buried in Kragujevac, next to two British ladies who also died in Serbia of typhus. Her grave was restored in 1980 when the town of Kragujevac started holding commemorations at the graveside every February 14th at noon to honor her and all other brave and noble women who lost their lives helping Serbia at that unfortunate time.

  8. Outbreak detection algorithms for seasonal disease data: a case study using ross river virus disease

    Directory of Open Access Journals (Sweden)

    Gatton Michelle L

    2010-11-01

    Full Text Available Abstract Background Detection of outbreaks is an important part of disease surveillance. Although many algorithms have been designed for detecting outbreaks, few have been specifically assessed against diseases that have distinct seasonal incidence patterns, such as those caused by vector-borne pathogens. Methods We applied five previously reported outbreak detection algorithms to Ross River virus (RRV disease data (1991-2007 for the four local government areas (LGAs of Brisbane, Emerald, Redland and Townsville in Queensland, Australia. The methods used were the Early Aberration Reporting System (EARS C1, C2 and C3 methods, negative binomial cusum (NBC, historical limits method (HLM, Poisson outbreak detection (POD method and the purely temporal SaTScan analysis. Seasonally-adjusted variants of the NBC and SaTScan methods were developed. Some of the algorithms were applied using a range of parameter values, resulting in 17 variants of the five algorithms. Results The 9,188 RRV disease notifications that occurred in the four selected regions over the study period showed marked seasonality, which adversely affected the performance of some of the outbreak detection algorithms. Most of the methods examined were able to detect the same major events. The exception was the seasonally-adjusted NBC methods that detected an excess of short signals. The NBC, POD and temporal SaTScan algorithms were the only methods that consistently had high true positive rates and low false positive and false negative rates across the four study areas. The timeliness of outbreak signals generated by each method was also compared but there was no consistency across outbreaks and LGAs. Conclusions This study has highlighted several issues associated with applying outbreak detection algorithms to seasonal disease data. In lieu of a true gold standard, a quantitative comparison is difficult and caution should be taken when interpreting the true positives, false positives

  9. Resonance vibrations of the Ross Ice Shelf cause persistent atmospheric waves

    Science.gov (United States)

    Godin, Oleg; Zabotin, Nikolay

    2017-04-01

    Recently reported lidar observations have revealed a persistent wave activity in the Antarctic middle and upper atmosphere that has no counterpart in observations at mid- and low-latitude locations [Chen et al., 2016]. The unusual wave activity suggests a geographically specific source of atmospheric waves with periods of 3-10 hours. Here, we investigate theoretically the hypothesis that the unusual atmospheric wave activity in Antarctica is generated by the fundamental and low-order modes of vibrations of the Ross Ice Shelf (RIS). Simple models are developed to describe basic physical properties of resonant vibrations of large ice shelves and their coupling to the atmosphere. Dispersion relation of the long surface waves, which propagate in the floating ice sheet and are responsible for its low-order resonances, is found to be similar to the dispersion relation of infragravity waves in the ice-free ocean. The phase speed of the surface waves and the resonant frequencies determine the periods and wave vectors of atmospheric waves that are generated by the RIS resonant oscillations. The altitude-dependent vertical wavelengths and the periods of the acoustic-gravity waves in the atmosphere are shown to be sensitive to the physical parameters of the RIS, which can be difficult to measure by other means. Predicted properties of the atmospheric waves prove to be in a remarkable agreement with the key features of the observed persistent wave activity], including frequency band, vertical wavelength range, and weak variation of the vertical wavelength with the height. The present work is a motivation for in-depth studies of coupling between vibrations of ice shelves and waves in the upper and middle atmosphere at high latitudes.

  10. Soluble Salt Accumulations in Taylor Valley, Antarctica: Implications for Paleolakes and Ross Sea Ice Sheet Dynamics

    Science.gov (United States)

    Toner, J. D.; Sletten, R. S.; Prentice, M. L.

    2012-12-01

    Soluble salt accumulations in Taylor Valley, Antarctica, provide a history of paleolakes and the advance of the Ross Sea Ice Sheet (RSIS). We measured soluble salts in 89 soils throughout Taylor Valley in soil-water extractions. In western Taylor Valley, soluble salt accumulations are relatively high and are comprised primarily of Na, Ca, Cl, and SO4. In eastern Taylor Valley, soluble salt accumulations are much lower and are comprised primarily of Na and HCO3. Salt compositions measured in soil-water extractions are highly influenced by the dissolution of sparingly soluble salts (e.g. calcite and gypsum) and cation exchange reactions. Furthermore, during soil-water extractions, Ca from calcite or gypsum dissolution exchanges with exchangeable Na, K, and Mg. These processes can strongly influence both the total salt content measured in soils and ionic ratios. Thus, it is important to consider the effects of these reactions when interpreting soluble salt accumulations measured in soil-water extractions. Calcite dissolution and cation exchange reactions also appear to have a widespread natural occurrence, resulting in the Na-HCO3 compositions of soils, streams, and lakes in eastern Taylor Valley. The soluble salt data supports the hypotheses that a lobe of the RSIS expanded into eastern Taylor Valley and dammed proglacial paleolakes. However, in contrast to previous studies, our findings indicate that the RSIS advanced deeper into Taylor Valley and that paleolakes were less extensive. By comparing soluble salt distributions across Taylor Valley, we conclude that a lobe of the RSIS filled all of eastern Taylor Valley and dammed paleolakes in western Taylor Valley up to 300 m elevation. Following ice retreat, smaller paleolakes formed in both western and eastern Taylor Valley up to about 120 m, with a prominent still stands at 80 m that was controlled by the elevation of a major valley threshold.

  11. West Antarctic Ice Sheet dynamics recorded in Plio-Pleistocene strata of the Ross Sea, Antarctica

    Science.gov (United States)

    Loth, A. S.; Bartek, L. R.; Luyendyk, B. P.; Wilson, D. S.

    2008-12-01

    Within the 100,000 square kilometer Eastern Basin of the Ross Sea, a 290 km section, oriented parallel to depostional dip along with 10 intersecting seismic sections that are oriented parallel to depositional strike were analyzed. Using Single-Channel Seismic (SCS) data from three different seismic surveys (NBP 0306, PD9022, and NBP 9308) 36 Plio-Pleistocene sequences were correlated across the basin from the modern ice shelf edge to the contemporary shelf break. Few of the sequences are continuous across the shelf, the majority of the sequences are of limited lateral extent. The facies within the sequences were analyzed to determine ice sheet behavior at the time of deposition. Three distinct depositional environments were interpreted based upon variations in the reflection attributes within the seismic data. Subglacial facies have a spectrum of reflection attributes from reflection-free to parallel, low-amplitude, discontinuous facies. The Grounding Line Zone facies are characterized by high amplitude, mildly discontinuous reflections. Proglacial environments are distinguished by parallel, high amplitude, continuous reflection packages. The facies distribution within many of the sequences consists of Subglacial facies in updip locales, Grounding Line Zone facies widely distributed across the shelf, and Proglacial facies present at downdip sites. The facies distribution within the sequences provides a record of the variation of the extent of the West Antarctic Ice Sheet (WAIS) throughout the Plio-Pleistocene. Not all sequences have a consecutive facies relationship, which may have resulted from several causes: 1) changes in the flow of the WAIS, 2) interplay between the East Antarctic Ice Sheet (EAIS) with the WAIS, or 3) additional grounding of the WAIS on paleobasin highs. Understanding the short-lived glacial events, whether they are a function of non-deposition or cannibalization of previous deposits, provides insight into the dynamics of marine based ice

  12. Radionuclides in ornithogenic sediments as evidence for recent warming in the Ross Sea region, Antarctica

    Energy Technology Data Exchange (ETDEWEB)

    Nie, Yaguang [Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 (China); Key Laboratory of Ion Beam Bioengineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei, Anhui 230031 (China); Xu, Liqiang [School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui 230009 (China); Liu, Xiaodong, E-mail: ycx@ustc.edu.cn [Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 (China); Emslie, Steven D. [Department of Biology and Marine Biology, University of North Carolina Wilmington, 601 S. College Road, Wilmington, NC 28403 (United States)

    2016-07-01

    Radionuclides including {sup 210}Pb, {sup 226}Ra and {sup 137}Cs were analyzed in eight ornithogenic sediment profiles from McMurdo Sound, Ross Sea region, East Antarctica. Equilibration between {sup 210}Pb and {sup 226}Ra were reached in all eight profiles, enabling the determination of chronology within the past two centuries through the Constant Rate of Supply (CRS) model. Calculated fluxes of both {sup 210}Pb and {sup 137}Cs varied drastically among four of the profiles (MB4, MB6, CC and CL2), probably due to differences in their sedimentary environments. In addition, we found the flux data exhibiting a clear decreasing gradient in accordance with their average deposition rate, which was in turn related to the specific location of the profiles. We believe this phenomenon may correspond to global warming of the last century, since warming-induced surface runoff would bring more inflow water and detritus to the coring sites, thus enhancing the difference among the profiles. To verify this hypothesis, the deposition rate against age of the sediments was calculated based on their determined chronology, which showed ascending trends in all four profiles. The significant increase in deposition rates over the last century is probably attributable to recent warming, implying a potential utilization of radionuclides as environmental indicators in this region. - Highlights: • {sup 210}Pb, {sup 226}Ra and {sup 137}Cs were measured in ornithogenic sediment profiles. • Chronology within 200 years was determined through Constant Rate of Supply model. • Calculated nuclide fluxes decreased with average deposition rate and locations. • Deposition rate over time indicated warming which caused the flux gradient.

  13. Ice shelf structure derived from dispersion curve analysis of ambient seismic noise, Ross Ice Shelf, Antarctica

    Science.gov (United States)

    Diez, A.; Bromirski, P. D.; Gerstoft, P.; Stephen, R. A.; Anthony, R. E.; Aster, R. C.; Cai, C.; Nyblade, A.; Wiens, D. A.

    2016-05-01

    An L-configured, three-component short period seismic array was deployed on the Ross Ice Shelf, Antarctica during November 2014. Polarization analysis of ambient noise data from these stations shows linearly polarized waves for frequency bands between 0.2 and 2 Hz. A spectral peak at about 1.6 Hz is interpreted as the resonance frequency of the water column and is used to estimate the water layer thickness below the ice shelf. The frequency band from 4 to 18 Hz is dominated by Rayleigh and Love waves propagating from the north that, based on daily temporal variations, we conclude were generated by field camp activity. Frequency-slowness plots were calculated using beamforming. Resulting Love and Rayleigh wave dispersion curves were inverted for the shear wave velocity profile within the firn and ice to ˜150 m depth. The derived density profile allows estimation of the pore close-off depth and the firn-air content thickness. Separate inversions of Rayleigh and Love wave dispersion curves give different shear wave velocity profiles within the firn. We attribute this difference to an effective anisotropy due to fine layering. The layered structure of firn, ice, water and the seafloor results in a characteristic dispersion curve below 7 Hz. Forward modelling the observed Rayleigh wave dispersion curves using representative firn, ice, water and sediment structures indicates that Rayleigh waves are observed when wavelengths are long enough to span the distance from the ice shelf surface to the seafloor. The forward modelling shows that analysis of seismic data from an ice shelf provides the possibility of resolving ice shelf thickness, water column thickness and the physical properties of the ice shelf and underlying seafloor using passive-source seismic data.

  14. Preliminary data on formaldehyde content in seawater samples from Terra Nova Bay (Ross Sea - Antarctica)

    Science.gov (United States)

    Largiuni, O.; Becagli, S.; Traversi, R.; Udisti, R.

    2003-04-01

    Formaldehyde is a key reactive intermediate in the methane oxidation chain. To date, only a few measurements of HCHO in surface seawater have been reported, suggesting a net flux of HCHO from the atmosphere to the ocean surface. Ocean is considered as a sink for atmospheric HCHO, but it cannot be excluded that marine areas characterized by high biogenic activity constitute a source of HCHO to atmosphere. Indeed, laboratory experiments carried out on seawater microlayer show HCHO production by photo-oxidation of dissolved organic matter. To date no measurements on deep seawater samples were performed. A sensitive method for the formaldehyde determination in aqueous sample by Flow Injection Analysis has been applied to seawater samples analysis. The method has a detection limit of 55 ng/l and a reproducibility of 2.5% at 1 ug/l level (5 % in sea water samples). The detector response is linear in the range 0.1 - 3000 ug/l. In the framework of the Italian Research Programme in Antarctica (PNRA), 20 samples were collected in two stations in the Gerlache Inlet (Terra Nova Bay, Western Ross Sea) during the 2001/2002 field campaign (November 2001 to February 2002). The samples were collected through a hole in the sea-ice, along the water column, using a Go-Flo type bottle. Usually, just sub-pack and 30 and 50 m depth fractions were collected. For each depth profile, temperature, salinity and chlorophyll fluorescence signal were measured. Formaldehyde concentrations range from 4.5 to 40 ppb. The relationship between HCHO content and other measured parameters is discussed. The sampling repetition in time at the same sites allowed evaluating the seasonal changes in the formaldehyde concentration/depth profiles.

  15. High Resolution Ice Surface of the Ross Ice Shelf: Accuracy and Links to Basal Processes

    Science.gov (United States)

    Starke, S. E.

    2015-12-01

    We use airborne laser altimetry data from IcePod and IceBridge to map the surface across the Ross Ice Shelf in Antarctica. Laser altimetry and radar data is analyzed from the IcePod 2014 and 2015 field campaigns as well as IceBridge 2013. Icepod is a multi sensor suite that includes ice penetrating radars, a swath scanning laser, visible and IR cameras as well as GPS mounted on a LC-130. Using shallow ice radar data from both IcePod and IceBridge we identify the base of the ice shelf. Across the shelf we observe distinct areas of high reflectivity in the radar data suggesting basal crevassing. In some regions, the basal reflector is not well defined. Laser altimetry profiles correlate surface morphology with features at the base including basal crevasses and marine ice formed by freezing on to the base of the ice shelf. Building Digital Elevation Models (DEMs) from the laser altimetry data, we investigate the relationship between the surface expressions of these ice shelf dynamics including thickness changes, potential sites of marine ice at the base and basal morphology in regions where a well defined basal reflector does not exist in the radar profiles. We present accuracy of the IcePod laser altimetry dataset using ground control points and GPS grids from Greenland and Antarctica as well as Photogrammetric DEMs. Our laser altimetry analysis resolves sub-meter surface features which, combined with coincident radar, provides a link between basal processes and their surface expressions.

  16. Glacial geomorphology of the Victoria Valley System, Ross Sea Region, Antarctica

    Science.gov (United States)

    Bockheim, James G.; McLeod, Malcolm

    2013-07-01

    During the 2011-2012 austral summer, we had the opportunity to verify a surficial geology map prepared nearly 50 years ago for the Victoria Valley system (VVS), the largest of the McMurdo Dry Valleys. We used high-resolution landsat images and a digital elevation model to identify landforms and prepare detailed maps of each of the five valleys in the VVS, including lateral and end moraines, rock glaciers, gelifluction sheets, gravel ripples, and hummocky and ice-cored drifts. Our mapping suggests that the Bull drift is less extensive than previously thought, attains a maximum elevation of ~ 750 m in Balham and Barwick Valleys and the upper Bull Pass region, and does not occur in McKelvey Valley. We found Insel drift to 850 m elevation in eastern McKelvey Valley and upper Bull Pass and were able to trace Insel drift down Bull Pass where it becomes Peleus drift in Wright Valley. The Victoria Lower Glacier likely responded to grounding of ice in the Ross Embayment and was out-of-phase with alpine glaciers elsewhere in the VVS. We amplified and quantified Calkin's relative chronology and provide here our multiple-parameter relative chronology for the McMurdo Dry Valleys that is based on surface-boulder weathering, soil weathering, salt stage, degree of development of the desert pavement, and form of patterned ground. Except for Victoria Lower Valley, we correlate Packard drift with Taylor II drift (ca., 120 ka), Vida drift with Taylor III drift (ca., 300 ka), Bull drift with Taylor IVb drift (2.7-3.5 Ma, and Insel drift with Peleus drift (> 3.7 Ma, < 5.4 Ma). The lack of a strong correlation between soil salt stage and depth of visible salts with elevation leads us to question whether a high-level lake (ca., 200 m deep) existed in the VVS during the early Holocene.

  17. Time-frequency analysis of migrating zooplankton in the Terra Nova Bay polynya (Ross Sea, Antarctica)

    Science.gov (United States)

    Picco, Paola; Schiano, M. Elisabetta; Pensieri, Sara; Bozzano, Roberto

    2017-02-01

    An upward-looking 150 kHz narrow-band Acoustic Doppler Current profiler was operated in Terra Nova Bay (Ross Sea, Antarctica) from 5 February 2000 to 16 January 2001 to monitor marine currents. The instrument sampled the upper 160 m of the water column with a time resolution of 1 h. Although the experimental setup was not specifically designed to assess zooplankton and fish distributions and behaviour, the Acoustic Doppler Current Profiler ancillary data provided useful information regarding the diel vertical migration of these acoustic targets. A time frequency analysis of the mean backscatter strength time series was conducted using a 240 h-wide window with a 1 day step. Assuming that the 24 h period peak is associated with zooplankton diel vertical migration, the amplitude of the power spectral energy on this band was extracted from each spectrum and the time series of amplitudes was analysed. The migration signal was very weak during summer, December to January, but was evident at the beginning and end of the polar night. Interestingly, the results indicated four "migratory blooms," the first at the end of August and the others approximately every three weeks subsequently, ending at the end of October. The daily migration was found to have a good relation with the solar cycle, while it was apparently uncorrelated with the moon phase. Migration patterns in the upper and the lower ocean layers displayed significant differences. Due to the lack of contemporary in-situ net samples, the results are more qualitative than quantitative; nonetheless, they demonstrate the validity of the method to extract relevant information even when applied to data obtained from a non-devoted low-resolution system. This may be of particular interest in polar areas where it is difficult to perform continuous biological monitoring but where a long time series of Acoustic Doppler Current profiler data is available.

  18. Photosynthesis-irradiance responses in the Ross Sea, Antarctica: a meta-analysis

    Science.gov (United States)

    Smith, W. O., Jr.; Donaldson, K.

    2015-06-01

    A meta-analysis of photosynthesis-irradiance measurements was completed using data from the Ross Sea, Antarctica, using a total of 417 independent measurements. PmB, the maximum, chlorophyll-specific, irradiance-saturated rate of photosynthesis, averaged 1.1 ± 0.06 μg C (μg Chl)-1 h-1. Light-limited, chlorophyll-specific photosynthetic rates (αB) averaged 0.030 ± 0.023 μg C (μg Chl)-1 h-1 (μmol quanta m-2 s-1)-1. Significant variations in PmB and αB were found as a function of season, with spring maximum photosynthetic rates being 60% greater than those in summer. Similarly, α values were 48% greater in spring. There was no detectable effect of sampling location on the photo-synthetic parameters, and temperature and macronutrient (NO3) concentrations also did not have an influence. However, irradiance and carbon dioxide concentrations, when altered under controlled conditions, exerted significant influences on photosynthetic parameters. Specifically, reduced irradiance resulted in significantly decreased PmB and increased αB values, and increased CO2 concentrations resulted in significantly increased PmB and αB values. Comparison of photosynthetic parameters derived at stations where iron concentrations were above and below 0.1 nM indicated that reduced iron levels were associated with significantly increased PmB values, confirming the importance of iron within the photosynthetic process. No significant difference was detected between stations dominated by diatoms and those dominated by the haptophyte Phaeocystis antarctica. The meta-analysis confirms the photosynthetic rates predicted from global analyses that are based solely on temperature and irradiance availability, but suggests that, for more accurate predictions of productivity in polar systems, a more detailed model that includes temporal effects of photosynthetic parameters will be required.

  19. Comparative effects of in ovo versus subcutaneous administration of the Marek's disease vaccine and pre-placement holding time on the early post-hatch quality of Ross × Ross 708 broiler chicks.

    Science.gov (United States)

    Peebles, E D; Barbosa, T M; Cummings, T S; Dickson, J; Womack, S K

    2016-09-01

    Effects of method of administration [moa; in ovo (i.o.) or s.c.] of the Marek's disease vaccine and pre-placement holding time (pht) on early post-hatch male broiler chick quality was investigated. Sixty-five Ross × Ross 708 broiler hatching eggs were randomly set in each of 15 replicate trays (blocks) belonging to each of 4 pre-assigned moa and pht treatment combinations (3,900 total eggs) in a single stage Jamesway incubator. Eggs that were i.o.-vaccinated received injections at 18 d of incubation and male chicks from eggs that were not i.o.-injected were vaccinated by s.c. injection at hatch. The i.o. injections (50 μL) were delivered by a commercial multi-egg injector and the s.c. injections (200 μL) were delivered by an automatic pneumatic s.c. injector. Male chicks from each moa group also were subjected to either a 4 or 18 h pht. At hatch and placement total and yolk-free BW; body length; body mass index; yolk sac weight; yolk-free body and yolk sac weights as percentages of total BW; and yolk-free body and yolk moisture concentrations were determined. Chick BW also was determined at 7 d of age. Hatchability of fertile eggs was not affected by i.o. injection. However, at hatch, body length was increased and body mass index was decreased in response to i.o. injection. No main effect of moa or an interactive effect with pht was observed for the above variables at placement. However, body length was longer and body mass was lower in the 18 h than in the 4 h pht chicks. Placement yolk sac and body weights, and the 7 d BW of 18 h pht chicks was also lower than that of 4 h pht chicks. In conclusion, prolonging pht for 14 h adversely affected early chick quality, whereas i.o. injection did not negatively affect the early post-hatch quality of Ross × Ross 708 broiler chicks whether or not they were held for 4 or 18 h prior to placement.

  20. Influence of the West Antarctic Ice Sheet and its collapse on the wind and precipitation regimes of the Ross Embayment

    Science.gov (United States)

    Seles, D.; Kowalewski, D. E.

    2015-12-01

    Marine Isotope Stage 31 (MIS 31) is a key analogue for current warming trends yet the extent of the East Antarctic Ice Sheet (EAIS) and the West Antarctic Ice Sheet (WAIS) during this interglacial remains unresolved. Inconsistencies persist between offshore records (suggesting the instability of WAIS) and McMurdo Dry Valley (MDV) terrestrial datasets (indicating long-term ice sheet stability). Here we use a high-resolution regional scale climate model (RegCM3_Polar) to reconstruct paleoclimate during MIS 31 (warm orbit, 400 ppm CO2) and assess changes in precipitation and winds (including katabatic) with WAIS present versus WAIS absent. The MIS 31 scenario with WAIS present resulted in minimal changes in wind magnitude compared with current climate conditions. With WAIS absent, the model predicts a decrease in coastal and highland monthly mean average wind velocities. The greatest rates of snowfall remain along the coast but shift towards higher latitudes with the interior continent remaining dry when WAIS is removed. Focusing on the Ross Embayment, this decreased monthly mean wind velocity and shift of winds to the east indicate a greater influence of offshore winds from the Ross Sea, enabling the increase of precipitation southward along the Transantarctic Mountains (TAM) (i.e. MDV). The apparent decrease of katabatic winds with no WAIS implies that offshore winds may be responsible for bringing the warmer, wetter air into the TAM. The change in wind and precipitation in the Ross Embayment and specifically the MDV highlights the impact of WAIS on Antarctic climate and its subsequent influence on the mass balance of peripheral EAIS domes (i.e. Taylor Dome). Modeling suggests that if WAIS was absent during MIS 31, we would expect (1) greater accumulation at such domes and (2) MDV terrestrial records that reflect a wetter climate, and (3) weaker winds suggesting possibly lower ablation/erosion rates compared to if WAIS was present.

  1. Histological comparison of layer media thickness of pulmonary arteroides between Cobb-Vantress and Ross broiler chicken exposed to hypoxia

    OpenAIRE

    Vásquez C., María; Laboratorio de Fisiología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos. Lima, Perú.; Cueva M., Sergio; Laboratorio de Fisiología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Ayón S., Milder; Laboratorio de Fisiología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos. Lima, Perú.; Lira M., Boris; Laboratorio de Fisiología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Chavera C., Alfonso; Laboratorio de Histología, Embriología y Patología Veterinaria, Facultad de Medicina Veterinaria de la Universidad Nacional Mayor de San Marcos, Lima; Angulo H., Pedro; Laboratorio de Farmacología y Toxicología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos. Lima, Perú; Falcón P., Néstor; Facultad de Veterinaria y Zootecnia, Universidad Peruana Cayetano Heredia, Lima

    2012-01-01

    The objective of the present study was to determine the development of the smooth muscle of pulmonary arterioles through the relationship of the smooth muscle layer of pulmonary arteriole/arteriolar diameter (CM/DA). Ninety Cobb-Vantress chicks and 90 Ross chicks were used. Of these, 10 birds were weighed and slaughtered at 1 day of age, and the others were randomly distributed in a group raised at sea level (n=40) and a group raised at 3320 m above the sea level (n=40). Ten birds per group w...

  2. The evolution of competition in banking in a transition economy: an application of the Panzar-Rosse model to Armenia

    Directory of Open Access Journals (Sweden)

    Armenuhi Mkrtchyan

    2005-06-01

    Full Text Available The structure of the banking industry typically undergoes fundamental changes during the transition to a market economy. This research employs the method suggested by Panzar and Rosse (1987 to evaluate the empirical evidence on the evolution of competitive structure in the Armenian banking industry during its recent transition and on the possible forces—market power or efficiency/contestability—that underlie that evolution. The results point to monopolistic competition.The reduction of bank numbers and the simultaneous increase in concentration is accompanied by a decline in competition intensity, which supports the market-power hypothesis

  3. Histological comparison of layer media thickness of pulmonary arteroides between Cobb-Vantress and Ross broiler chicken exposed to hypoxia

    OpenAIRE

    Vásquez C., María; Laboratorio de Fisiología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Cueva M., Sergio; Laboratorio de Fisiología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima; Ayón S., Milder; Laboratorio de Fisiología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima Perú.; Lira M., Boris; Laboratorio de Fisiología Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima; Chavera C., Alfonso; Laboratorio de Histología, Embriología y Patología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Angulo H., Pedro; Laboratorio de Farmacología y Toxicología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos. Lima, Perú; Falcón P., Néstor; Facultad de Veterinaria y Zootecnia, Universidad Peruana Cayetano Heredia, Lima

    2012-01-01

    The objective of the present study was to determine the development of the smooth muscle of pulmonary arterioles through the relationship of the smooth muscle layer of pulmonary arteriole/arteriolar diameter (CM/DA). Ninety Cobb-Vantress chicks and 90 Ross chicks were used. Of these, 10 birds were weighed and slaughtered at 1 day of age, and the others were randomly distributed in a group raised at sea level (n=40) and a group raised at 3320 m above the sea level (n=40). Ten birds per group w...

  4. Thermal regime of active layer at two lithologically contrasting sites on James Ross Island, Antarctic Peninsula.

    Science.gov (United States)

    Hrbáček, Filip; Nývlt, Daniel; Láska, Kamil

    2016-04-01

    Antarctic Peninsula region (AP) represents one of the most rapidly warming parts of our planet in the last 50 years. Despite increasing research activities along both western and eastern sides of AP in last decades, there is still a lot of gaps in our knowledge relating to permafrost, active layer and its thermal and physical properties. This study brings new results of active layer monitoring on James Ross Island, which is the largest island in northern AP. Its northern part, Ulu Peninsula, is the largest ice-free area (more than 200 km2) in the region. Due its large area, we focused this study on sites located in different lithologies, which would affect local thermal regime of active layer. Study site (1) at Abernethy Flats area (41 m a.s.l.) lies ~7 km from northern coast. Lithologically is formed by disintegrated Cretaceous calcareous sandstones and siltstones of the Santa Marta Formation. Study site (2) is located at the northern slopes of Berry Hill (56 m a.s.l.), about 0.4 km from northern coastline. Lithology is composed of muddy to intermediate diamictites, tuffaceous siltstones to fine grained sandstones of the Mendel Formation. Data of air temperature at 2 meters above ground and the active layer temperatures at 75 cm deep profiles were obtained from both sites in period 1 January 2012 to 31 December 2014. Small differences were found when comparing mean air temperatures and active temperatures at 5 and 75 cm depth in the period 2012-2014. While the mean air temperatures varied between -7.7 °C and -7.0 °C, the mean ground temperatures fluctuated between -6.6 °C and -6.1 °C at 5 cm and -6.9 °C and -6.0 °C at 75 cm at Abernethy Flats and Berry Hill slopes respectively. Even though ground temperature differences along the profiles weren't pronounced during thawing seasons, the maximum active layer thickness was significantly larger at Berry Hill slopes (80 to 82 cm) than at Abernethy Flats (52 to 64 cm). We assume this differences are affected by

  5. Trends in the breeding population of Adélie penguins in the Ross Sea, 1981-2012: a coincidence of climate and resource extraction effects.

    Science.gov (United States)

    Lyver, Phil O'B; Barron, Mandy; Barton, Kerry J; Ainley, David G; Pollard, Annie; Gordon, Shulamit; McNeill, Stephen; Ballard, Grant; Wilson, Peter R

    2014-01-01

    Measurements of the size of Adélie penguin (Pygoscelis adeliae) colonies of the southern Ross Sea are among the longest biologic time series in the Antarctic. We present an assessment of recent annual variation and trends in abundance and growth rates of these colonies, adding to the published record not updated for more than two decades. High angle oblique aerial photographic surveys of colonies were acquired and penguins counted for the breeding seasons 1981-2012. In the last four years the numbers of Adélie penguins in the Ross and Beaufort Island colonies (southern Ross Sea metapopulation) reached their highest levels since aerial counts began in 1981. Results indicated that 855,625 pairs of Adélie penguins established breeding territories in the western Ross Sea, with just over a quarter (28%) of those in the southern portion, constituting a semi-isolated metapopulation (three colonies on Ross Island, one on nearby Beaufort Island). The southern population had a negative per capita growth rate of -0.019 during 1981-2000, followed by a positive per capita growth rate of 0.067 for 2001-2012. Colony growth rates for this metapopulation showed striking synchrony through time, indicating that large-scale factors influenced their annual growth. In contrast to the increased colony sizes in the southern population, the patterns of change among colonies of the northern Ross Sea were difficult to characterize. Trends were similar to southern colonies until the mid-1990s, after which the signal was lost owing to significantly reduced frequency of surveys. Both climate factors and recovery of whale populations likely played roles in the trends among southern colonies until 2000, after which depletion of another trophic competitor, the Antarctic toothfish (Dissostichus mawsoni), may explain the sharp increasing trend evident since then.

  6. Trends in the breeding population of Adelie penguins in the Ross Sea, 1981-2012: a coincidence of climate and resource extraction effects.

    Directory of Open Access Journals (Sweden)

    Phil O'B Lyver

    Full Text Available Measurements of the size of Adélie penguin (Pygoscelis adeliae colonies of the southern Ross Sea are among the longest biologic time series in the Antarctic. We present an assessment of recent annual variation and trends in abundance and growth rates of these colonies, adding to the published record not updated for more than two decades. High angle oblique aerial photographic surveys of colonies were acquired and penguins counted for the breeding seasons 1981-2012. In the last four years the numbers of Adélie penguins in the Ross and Beaufort Island colonies (southern Ross Sea metapopulation reached their highest levels since aerial counts began in 1981. Results indicated that 855,625 pairs of Adélie penguins established breeding territories in the western Ross Sea, with just over a quarter (28% of those in the southern portion, constituting a semi-isolated metapopulation (three colonies on Ross Island, one on nearby Beaufort Island. The southern population had a negative per capita growth rate of -0.019 during 1981-2000, followed by a positive per capita growth rate of 0.067 for 2001-2012. Colony growth rates for this metapopulation showed striking synchrony through time, indicating that large-scale factors influenced their annual growth. In contrast to the increased colony sizes in the southern population, the patterns of change among colonies of the northern Ross Sea were difficult to characterize. Trends were similar to southern colonies until the mid-1990s, after which the signal was lost owing to significantly reduced frequency of surveys. Both climate factors and recovery of whale populations likely played roles in the trends among southern colonies until 2000, after which depletion of another trophic competitor, the Antarctic toothfish (Dissostichus mawsoni, may explain the sharp increasing trend evident since then.

  7. Outcomes and Short-Term Follow-Up in Complex Ross Operations in Pediatric Patients Undergoing Damus-Kaye-Stansel Takedown.

    Science.gov (United States)

    Baird, Christopher W; Zurakowski, David; Bueno, Alejandra; Borisuk, Michele J; Raju, Vijayakumar; Mokashi, Suyog A; Emani, Sitaram; Marx, Gerald R; Del Nido, Pedro J

    2016-01-01

    Review echocardiography and outcomes before and after Ross procedures, including patients undergoing biventricular conversion with Damus-Kaye-Stansel (DKS) takedown. A retrospective review was performed on 62 patients undergoing simple (control group) and complex Ross procedures, including 12 patients who underwent biventricular conversion with Ross operation and DKS takedown (complex). Echocardiography was reviewed preoperatively and at discharge and late follow-up. Kaplan-Meier estimates of patient survival and freedom from reintervention were obtained. In all, 62 patients had a median age of 4.5 years (interquartile range [IQR]: 1-12.5), weight of 16.4kg (IQR: 8-41), and follow-up of 3.8 years (IQR: 1.3-6). The complex DKS takedown group had 2 deaths, no neoaortic valve or root reinterventions, and 3 right ventricular outflow tract (VOT) reinterventions. There were no differences from the control group in left VOT or right VOT reinterventions. Neither group showed differences between pre- and late follow-up aortic root and ascending aorta dimensions, and no correlations were found among preoperative pulmonary valve (PV) size, late aortic regurgitation (AR), aortic root, or ascending aortic Z-scores. Aortic valve size increased from discharge to late follow-up for both groups (P ≤ .05); 90% of patients at late follow-up had mild or less AR with similar distributions in severity between complex and control groups. Severity of late AR showed no correlation with preoperative PV size and is independent of it. The Ross procedure has good short-term results in simple and complex patients and should be considered in those undergoing Ross operation with biventricular conversion and DKS takedown. Moreover, native PV size should not be a contraindication for Ross procedure.

  8. Paleomagnetism of sedimentary cores from the Ross Sea outer shelf and continental slope (PNRA-ROSSLOPE II Project)

    Science.gov (United States)

    Macrì, Patrizia; Sagnotti, Leonardo; Caricchi, Chiara; Colizza, Ester

    2016-04-01

    We carried out a paleomagnetic and rock magnetic study of 4 gravity cores sampled in the Ross Sea continental slope of the area to the east of Pennell-Iselin banks. The cores (RS14-C1, C2, C3 and ANTA99-C20) consist of hemipelagic fine-grained (silty-clays) sediments with an IRD component. Rock magnetic and paleomagnetic measurements were carried out at 1-cm spacing on u-channel samples. The data indicate that the cored sediments carry a well-defined characteristic remanent magnetization (ChRM) and have a valuable potential to reconstruct dynamics and amplitude of the geomagnetic field variation at high southern latitudes (ca. 75°S) during the Holocene and the late Pleistocene. The paleomagnetic and rock magnetic data are integrated in a multidisciplinary context which includes previous geological, geophysical, oceanographic and morpho-bathimetric data obtained in the same area in the frame of the PNRA/ROSSLOPE (Past and present sedimentary dynamic in the ROSS Sea: a multidisciplinary approach to study the continental slope) Project. The main aim of the project is to investigate the relation between present and past water mass circulation and to provide a basis for paleoceanographic reconstructions and for the development of a depositional model of the modern processes active along the continental slope.

  9. Thermohaline circulation below the Ross Ice Shelf - A consequence of tidally induced vertical mixing and basal melting

    Science.gov (United States)

    Macayeal, D. R.

    1984-01-01

    The warmest water below parts of the Ross Ice Shelf resides in the lowest portion of the water column because of its high salinity. Vertical mixing caused by tidal stirring can thus induce ablation by lifting the warm but dense water into contact with the ice shelf. A numerical tidal simulation indicates that vertically well-mixed conditions predominate in the southeastern part of the sub-ice shelf cavity, where the water column thickness is small. Basal melting in this region is expected to be between 0.05 and 0.5 m/yr and will drive a thermohaline circulation having the following characteristics: high salinity shelf water (at - 1.8 C), formed by winter sea ice production in the open Ross Sea, flows along the seabed toward the tidal mixing fronts below the ice shelf; and meltwater (at -2.2 C), produced in the well-mixed region, flows out of the sub-ice shelf cavity along the ice shelf bottom. Sensitivity of this ablation process to climatic change is expected to be small because high salinity shelf water is constrained to have the sea surface freezing temperature.

  10. The Ross classification for heart failure in children after 25 years: a review and an age-stratified revision.

    Science.gov (United States)

    Ross, Robert D

    2012-12-01

    Accurate grading of the presence and severity of heart failure (HF) signs and symptoms in infants and children remains challenging. It has been 25 years since the Ross classification was first used for this purpose. Since then, several modifications of the system have been used and others proposed. New evidence has shown that in addition to signs and symptoms, data from echocardiography, exercise testing, and biomarkers such as N-terminal pro-brain natriuretic peptide (NT-proBNP) all are useful in stratifying outcomes for children with HF. It also is apparent that grading of signs and symptoms in children is dependent on age because infants manifest HF differently than toddlers and older children. This review culminates in a proposed new age-based Ross classification for HF in children that incorporates the most useful data from the last two decades. Testing of this new system will be important to determine whether an age-stratified scoring system can unify the way communication of HF severity and research on HF in children is performed in the future.

  11. Lithology and chronology of ice-sheet fluctuations (magnetic susceptibility of cores from the western Ross Sea)

    Science.gov (United States)

    Jennings, Anne E.

    1993-01-01

    The goals of the marine geology part of WAIS include reconstructing the chronology and areal extent of ice-sheet fluctuations and understanding the climatic and oceanographic influences on ice-sheet history. As an initial step toward attaining these goals, down-core volume magnetic susceptibility (MS) logs of piston cores from three N-S transects in the western Ross Sea are compared. The core transects are within separate petrographic provinces based on analyses of till composition. The provinces are thought to reflect the previous locations of ice streams on the shelf during the last glaciation. Magnetic susceptibility is a function of magnetic mineral composition, sediment texture, and sediment density. It is applied in the western Ross Sea for two purposes: (1) to determine whether MS data differentiates the three transects (i.e., flow lines), and thus can be used to make paleodrainage reconstructions of the late Wisconsinan ice sheet; and (2) to determine whether the MS data can aid in distinguishing basal till diamictons from diamictons of glacial-marine origin and thus, aid paleoenvironmental interpretations. A comparison of the combined data of cores in each transect is presented.

  12. Determination of Ar Concentration Evolution Within DIII-D Core Plasma by X-ray Ross Filter Method

    Science.gov (United States)

    Bogatu, I. N.; Edgell, D. H.; Brooks, N. H.; Snider, R. T.; West, W. P.; Wade, M. R.

    2001-10-01

    Injection of the non-recycling noble gas Ar into the DIII-D divertor is a promising technique for reducing the heat load on the plates; it also seems to improve thermal transport in an advanced operating mode. During such experiments core plasma contamination by migrating Ar can be investigated by measuring the evolution of the Ar concentration profile using the Ross filter method implemented on the fan shaped X-ray poloidal diagnostics on DIII-D. A Ross filter with energy pass band centered on the ArXVII K_α line at 3.14 keV, discriminating Ar K_α line against background radiation, was used on DIII-D. A high sensitivity to the injected quantity of Ar and good discrimination against Ne was observed. We present reconstruction of Ar concentration profiles from the chord-integrated measurements using the measured Te and ne profiles. Using the transport code MIST, the impurity diffusion coefficients can be determined by matching the time evolution of the Ar concentration evolution.

  13. [Experience of Mitral Valve Replacement Using a Pulmonary Autograft (Ross II Operation) in an Infant;Report of a Case].

    Science.gov (United States)

    Kawahito, Tomohisa; Egawa, Yoshiyasu; Yoshida, Homare; Shimoe, Yasushi; Onishi, Tatsuya; Miyagi, Yuhichi; Terada, Kazuya; Ohta, Akira

    2015-07-01

    A 24-day-old boy suddenly developed progressive heart failure and was transported to our hospital. Echocardiography showed massive mitral regurgitation due to chordal rupture. Mitral valve repair was performed at 28 days of life, but postoperative valvular function was not satisfactory. A mechanical valve was implanted in the supra-annular position at 37 days of life. Two months after valve replacement, the mechanical valve was suddenly stuck. Emergent redo valve replacement was performed, but the prosthetic valve became stuck again 2 months after the 3rd operation, despite sufficient anti-coagulation therapy. At the 4th operation (6 months after birth), we implanted a pulmonary autograft in the mitral position instead of another mechanical valve in an emergent operation. The right ventricular outflow tract was reconstructed with a valved conduit. A postoperative catheter examination, which was performed 1 year after the Ross II operation, showed mild mitral stenosis with no regurgitation. Previous reports of Ross II operations in infants are rare and long-term results are unknown. However, we advocate that this procedure should be a rescue operation for mitral valve dysfunction in the early period of infants.

  14. Continuous and discrete measurements of atmospheric methane from an ice core from Roosevelt Island, East Ross Sea, Antarctica

    Science.gov (United States)

    Blunier, T.; Simonsen, M. F.; Brook, E.; Lee, J.; Vallelonga, P. T.; Bertler, N. A. N.

    2014-12-01

    A new ice core from Roosevelt Island was drilled for the Roosevelt Island Climate Evolution (RICE) project to establish the history of deglaciation of the Ross Sea. Evidence of glacial retreat in the Ross Sea Embayment shows that deglaciation happened in several stages of rapid collapse and persisted well after the melting of the Northern Hemisphere ice sheets was complete. The drill location on a small island surrounded by sea ice makes dating the core a challenge. We present a timescale for Roosevelt Island using mixing ratios of methane in air preserved within the ice core measured continuously with a Picarro laser spectrometer as well as in high-resolution with gas chromatography (GC). Discrete data from GC analysis over the top 400m of core replicate both the magnitude and variations from other high-resolution ice core records from WAIS Divide, Law Dome, GISP2 and NEEM S1. Both the continuous and discrete methane records of the RICE core were matched to these established records and provide an accurate and consistent depth-age relationship for the past 3.6kyr. The deeper part of the core was measured continuously in July 2014. First inspection of the data suggests that the oldest section of the core reaches into the previous interglacial (Eemian). We will present preliminary evaluated continuous methane data for the deeper part of the core together with a first time scale for the Roosevelt Island ice core.

  15. Recent changes detected on two glaciers at the northern part of James Ross Island, Antarctica

    Science.gov (United States)

    Nývlt, Daniel; Kopačková, Veronika; Láska, Kamil; Engel, Zbyněk.

    2010-05-01

    Antarctic Peninsula is one of the regions, which have been exposed to the most rapid warming of the Earth since 1950. Consequences of climate changes are clearly documented by recent disintegration of ice shelves on both sides of the Antarctic Peninsula as well as by the retreat of land-based glaciers. James Ross Island, located close to the northernmost tip of the Antarctic Peninsula, represents an excellent place to study changes in the glacier mass-balance and their sensitivity to a regional warming trend. Two different types of glaciers of the Ulu Peninsula, the Whisky Glacier and the Davies Dome have been studied. Multi-temporal remote sensing data (aerial photographs, Landsat MSS, TM and ETM+ and Aster satellite optical and thermal multispectral data) and field survey allowed detecting changes in extent (2-D) as well as calculating glacier mass-balance changes (3-D) for these two glaciers from 1977 to 2009. The Whisky Glacier is a well-delimited valley glacier located mostly below the local Equilibrium line altitude (ELA). The glacier with high-flow velocities is fed by an intensive snow accumulation caused by prevailing southwestern winds. The Whisky Glacier covers an area of 2.3 km2 and its altitude varies from 215 to 475 m a.s.l. The Davies Dome is a flat-bottom dome glacier. Significant parts of its surface are located above the ELA and limited flow velocities are characteristic for the most parts of its body. However, the Davies Dome has a single 500-700 m wide southwestern outlet flowing towards the Whisky Bay. The Davies Dome extends an area of 6.7 km2 and its altitude ranges from 0 to 514 m a.s.l. Both glaciers experienced massive extension of their ice tongues towards the Brandy Bay during the mid Holocene. Lateral moraines located in front of the both glaciers heading down to the left coast of the Brandy Bay document this event. According to the remote sensing data and field investigations both glaciers have retreated since 1977. Between 2006 and

  16. Pockmarks, Western Ross Sea, Antarctica and Mendeleev Ridge, Central Arctic Ocean: Recent and/or Prevalent?

    Science.gov (United States)

    Lawver, L. A.; Hornbach, M. J.; Davis, M. B.; Brumley, K.; Phillips, R. L.

    2008-12-01

    In 2004, the NBP-0401 cruise to the western Ross Sea, found a large field of pockmarks to the north and west of Franklin Island. The pockmarks ranged in size up to 300 m or more in diameter and are up to 30 m deep. The pockmarks are generally circular and are found in a partially surveyed 3,000 km2 region at water depths ranging from 450 m to 510 m. The pockmarks were most concentrated in an area of approximately 400 km2 where they cover as much as 20% of the seafloor. About 50 km to the west of the heavily pockmarked area, a series of seafloor constructions, up to 5 km in diameter and 120 m high were found in water depths of 490 m to 520 m. Again, ice conditions precluded a complete survey but it is believed the circular features may be carbonate mounds very similar in size and water depth to the ones found by Shannon et al. (2007) in the Porcupine Bight region, offshore Ireland. In 2006, the HLY-0602 cruise undertook a seismic refraction experiment along the Mendeleev Ridge in the Arctic ocean. In the course of the experiment, two to three multibeam lines were run approximately along the crest of the ridge from 76° 40'N to 78° 50'N. On HLY-0503, pockmarks were found in the vicinity of 78° 15'N including one extraordinary cluster of pockmarks at 78° 20'N which were cored on HLY-0602. Three gravity cores taken within pockmarks recovered a significant shell hash in the upper 1 cm but carbon analysis on the shells did not reveal any evidence of chemosynthetic origin for the mollusks. Cores taken along the ridge but away from pockmarks had at most a single shell in the upper 1 cm. Shells were not found below the surface of the cores. Pockmarks along the Mendeleev Ridge are found at depths from 820 m to an extraordinary feature at a depth of ~1420 M. This collapse? feature is 10 km by 5 km with a series of pockmarks in its deepest part. The major feature itself has a central depth of 1480 m but pockmarks withing the feature are as deep as 1520 m at their individual

  17. A Reference-Intensive Embedded Librarian Program: Kresge Business Administration Library's Program to Support Action-Based Learning at the Ross School of Business

    Science.gov (United States)

    Berdish, Laura; Seeman, Corey

    2010-01-01

    While a great deal of literature on embedded librarians in academic libraries is focused on the role of instructor, there are many other services that could be provided by librarians working closely with students. The Kresge Business Administration Library (Stephen M. Ross School of Business at the University of Michigan) has created a unique…

  18. Common Core State Standards and Teacher Effectiveness. Q&A with Ross Wiener, Ph.D. REL Mid-Atlantic Teacher Effectiveness Webinar Series

    Science.gov (United States)

    Regional Educational Laboratory Mid-Atlantic, 2013

    2013-01-01

    In this REL Mid-Atlantic webinar, Dr. Ross Wiener, Vice President and Executive Director of the Education and Society Program, Aspen Institute, discussed strategies for integrating the Common Core State Standards (CCSS) into teacher effectiveness systems, including ways in which the CCSS can support professional growth and inform teacher…

  19. Using C-Span in the Classroom to Enhance Student Analysis of Ross Perot's Sensitivity with American Diversity During the 1992 Presidential Campaign

    Science.gov (United States)

    Schnell, James

    2007-01-01

    The C-SPAN application to be described in this article is useful in the Cross-Cultural Communication and Mass Media courses. This application focuses on how we define what connotes sensitivity & insensitivity with diversity issues and how journalistic interpretation can affect our perception via mass media. Businessman Ross Perot rose from…

  20. A Qualitative Case Study to Investigate the Technology Acceptance Experience Outlined in the TAM Using the Kubler-Ross Stages of Grieving and Acceptance

    Science.gov (United States)

    Sotelo, Benjamin Eladio

    2015-01-01

    The Technology Acceptance Model (TAM) has been an important model for the understanding of end user acceptance regarding technology and a framework used in thousands of researched scenarios since publication in 1986. Similarly, the Kubler-Ross model of death and dying has also been used as a model for the study of acceptance within the medical…

  1. Implications of Two Well-Known Models for Instructional Designers in Distance Education: Dick-Carey versus Morrison-Ross-Kemp

    Science.gov (United States)

    Akbulut, Yavuz

    2007-01-01

    This paper first summarizes, and then compares and contrasts two well-known instructional design models: Dick and Carey Model (DC) and Morrison, Ross and Kemp model (MRK). The target audiences of both models are basically instructional designers. Both models have applications for different instructional design settings. They both see the…

  2. A Qualitative Case Study to Investigate the Technology Acceptance Experience Outlined in the TAM Using the Kubler-Ross Stages of Grieving and Acceptance

    Science.gov (United States)

    Sotelo, Benjamin Eladio

    2015-01-01

    The Technology Acceptance Model (TAM) has been an important model for the understanding of end user acceptance regarding technology and a framework used in thousands of researched scenarios since publication in 1986. Similarly, the Kubler-Ross model of death and dying has also been used as a model for the study of acceptance within the medical…

  3. Análisis aeromagnético de la cuenca James Ross, península Antártica

    Directory of Open Access Journals (Sweden)

    Marta E Ghidella

    2013-12-01

    Full Text Available Durante el verano austral de 1998/1999, en el marco de un proyecto internacional aerogeofísico conjunto entre el British Antarctic Survey y el Instituto Antártico Argentino, fueron recolectados datos de magnetismo y gravedad terrestres sobrevolando el archipiélago James Ross, situado en el extremo noreste de la península Antártica. En dicho archipiélago, sobre el borde occidental de la cuenca James Ross, aflora el Grupo Volcánico Isla James Ross (JRIVG de edad miocena a reciente. Basados en el análisis y modelización de las anomalías magnéticas se reveló la presencia de estructuras de origen volcánico y tectónico ocultas bajo el manto de hielo en la isla James Ross y el mar de Weddell. El monte Haddington, en la isla James Ross, está asociado con anomalías lineales de gran amplitud (200-800 nT. Se identificaron centros efusivos menores, ocultos bajo el hielo glaciar. Se detectó la presencia de dos arcos magnéticos concéntricos constituidos por una sucesión de anomalías circulares de amplitudes significativas (30-300 nT que se han interpretado como vías primarias de encauzamiento del magmatismo neógeno a través de fajas de debilidad estructural en la corteza terrestre. Costa afuera, se manifiesta un alto magnético de baja amplitud (~20-30 nT paralelo al margen de la península Antártica que se relacionó con una importante zona de fallas de rumbo detectada por sísmica de reflexión.

  4. Vector competence of Aedes albopictus from Houston, Texas, for dengue serotypes 1 to 4, yellow fever and Ross River viruses.

    Science.gov (United States)

    Mitchell, C J; Miller, B R; Gubler, D J

    1987-09-01

    A combination of virus infection and transmission experiments showed that a Houston, Texas strain of Aedes albopictus is a competent vector for dengue (DEN), yellow fever (YF) and Ross River (RR) viruses. However, at 14 days incubation, DEN virus infection rates in a Puerto Rican strain of Aedes aegypti were significantly higher for each of the four DEN serotypes, except DEN-1, than in Houston Ae. albopictus fed simultaneously on the same virus suspensions. The degree of correlation between disseminated DEN infection rates in Houston Ae. albopictus and transmission to an in vitro system ranged from 42 to 88% for the four DEN serotypes. No significant difference was noted in YF virus infection rates or transmission rates in the two mosquito species fed on the same virus suspensions and incubated for the same time period. Also, RR virus infection and transmission rates in Houston and Hawaiian strains of Ae. albopictus were generally comparable.

  5. Diatom-based correlation of early to mid-Pliocene drillcores from the southwestern Ross Sea, Antarctica

    Science.gov (United States)

    Winter, Diane; Sjunneskog, Charlotte; Scherer, Reed; Maffioli, Paola; Harwood, David

    2012-10-01

    The ANDRILL AND-1B drillcore in southern Victoria Land Basin, Antarctica recovered an upper Miocene to early Pleistocene continental shelf stratigraphic section, including a spectacular Pliocene and Pleistocene sequence of alternating diamictite and diatom-rich sediments. This punctuated sequence reflects variation between glacial sediments deposited by ice advance over the site and open-marine diatom productivity and sedimentation. An early Pliocene age for the base of diatom-rich sediment is constrained through integrated diatom biostratigraphy and magnetostratigraphy. The presence of marine diatom Shionodiscus tetraoestrupii from the top of the core to 583.64 mbsf indicates the lowest diatom-bearing sediments are younger than 5 Ma. This drillcore provides important new chronostratigraphic control for paleoenvironmental changes also recorded in three drillcores from the western coast of the McMurdo Sound area, DVDP-10 and -11 in Taylor Valley and CIROS-2 from the seaward edge of Ferrar Fjord. The refined continental shelf biostratigraphy developed from AND-1B provides a framework for regional correlation to understand better the timing and character of large paleoenvironmental changes in the western Ross Sea that involve the history of the West Antarctic Ice Sheet (WAIS). Multivariate analysis, along with traditional biostratigraphic approaches, enables the correlation and comparison of coeval intervals in these drillcores. A composite stratigraphic sequence from these four cores suggests the early and mid-Pliocene Ross Sea experienced extended intervals of open-marine conditions with minimal sea-ice cover and high diatom production and sedimentation. This new information provides important constraints on Antarctic paleoclimate and ice sheet history during an important interval when global climate was warmer than today. The history preserved in these four drillcores will be an important tool to guide and test future ice sheet and climate models.

  6. Seasonal variation of air temperature at the Mendel Station, James Ross Island in the period of 2006-2009

    Science.gov (United States)

    Laska, Kamil; Prošek, Pavel; Budík, Ladislav

    2010-05-01

    Key words: air temperature, seasonal variation, James Ross Island, Antarctic Peninsula Recently, significant role of the atmospheric and oceanic circulation variation on positive trend of near surface air temperature along the Antarctic Peninsula has been reported by many authors. However, small number of the permanent meteorological stations located on the Peninsula coast embarrasses a detail analysis. It comprises analysis of spatiotemporal variability of climatic conditions and validation of regional atmospheric climate models. However, geographical location of the Czech Johann Gregor Mendel Station (hereafter Mendel Station) newly established on the northern ice-free part of the James Ross Island provides an opportunity to fill the gap. There are recorded important meteorological characteristics which allow to evaluate specific climatic regime of the region and their impact on the ice-shelf disintegration and glacier retreat. Mendel Station (63°48'S, 57°53'W) is located on marine terrace at the altitude of 7 m. In 2006, a monitoring network of several automatic weather stations was installed at different altitudes ranging from the seashore level up to mesas and tops of glaciers (514 m a.s.l.). In this contribution, a seasonal variation of near surface air temperature at the Mendel Station in the period of 2006-2009 is presented. Annual mean air temperature was -7.2 °C. Seasonal mean temperature ranged from +1.4 °C (December-February) to -17.7 °C (June-August). Frequently, the highest temperature occurred in the second half of January. It reached maximum of +8.1 °C. Sudden changes of atmospheric circulation pattern during winter caused a large interdiurnal variability of air temperature with the amplitude of 30 °C.

  7. Processes influencing formation of low-salinity high-biomass lenses near the edge of the Ross Ice Shelf

    Science.gov (United States)

    Li, Yizhen; McGillicuddy, Dennis J.; Dinniman, Michael S.; Klinck, John M.

    2017-02-01

    Both remotely sensed and in situ observations in austral summer of early 2012 in the Ross Sea suggest the presence of cold, low-salinity, and high-biomass eddies along the edge of the Ross Ice Shelf (RIS). Satellite measurements include sea surface temperature and ocean color, and shipboard data sets include hydrographic profiles, towed instrumentation, and underway acoustic Doppler current profilers. Idealized model simulations are utilized to examine the processes responsible for ice shelf eddy formation. 3-D model simulations produce similar cold and fresh eddies, although the simulated vertical lenses are quantitatively thinner than observed. Model sensitivity tests show that both basal melting underneath the ice shelf and irregularity of the ice shelf edge facilitate generation of cold and fresh eddies. 2-D model simulations further suggest that both basal melting and downwelling-favorable winds play crucial roles in forming a thick layer of low-salinity water observed along the edge of the RIS. These properties may have been entrained into the observed eddies, whereas that entrainment process was not captured in the specific eddy formation events studied in our 3-D model-which may explain the discrepancy between the simulated and observed eddies, at least in part. Additional sensitivity experiments imply that uncertainties associated with background stratification and wind stress may also explain why the model underestimates the thickness of the low-salinity lens in the eddy interiors. Our study highlights the importance of incorporating accurate wind forcing, basal melting, and ice shelf irregularity for simulating eddy formation near the RIS edge. The processes responsible for generating the high phytoplankton biomass inside these eddies remain to be elucidated.

  8. Dissolved iron transport pathways in the Ross Sea: Influence of tides and horizontal resolution in a regional ocean model

    Science.gov (United States)

    Mack, Stefanie L.; Dinniman, Michael S.; McGillicuddy, Dennis J.; Sedwick, Peter N.; Klinck, John M.

    2017-02-01

    Phytoplankton production in the Ross Sea is regulated by the availability of dissolved iron (dFe), a limiting micro-nutrient, whose sources include Circumpolar Deep Water, sea ice melt, glacial melt, and benthic sources (sediment efflux and remineralization). We employ a passive tracer dye to model the benthic dFe sources and track pathways from deep areas of the continental shelf to the surface mixed layer in simulations with and without tidal forcing, and at 5 and 1.5 km horizontal resolution. This, combined with dyes for each of the other dFe sources, provides an estimate of total dFe supply to surface waters. We find that tidal forcing increases the amount of benthic dye that covers the banks on the continental shelf. Calculations of mixed layer depth to define the surface ocean give similar average values over the shelf, but spatial patterns differ between simulations, particularly along the ice shelf front. Benthic dFe supply in simulations shows an increase with tidal forcing and a decrease with higher resolution. The changes in benthic dFe supply control the difference in total supply between simulations. Overall, the total dFe supply from simulations varies from 5.60 to 7.95 μmol m-2 year-1, with benthic supply comprising 32-50%, comparing well with recent data and model synthesis. We suggest that including tides and using high horizontal resolution is important, especially when considering spatial variability of iron supply on the Ross Sea shelf.

  9. Influence of coupling on atmosphere, sea ice and ocean regional models in the Ross Sea sector, Antarctica

    Energy Technology Data Exchange (ETDEWEB)

    Jourdain, Nicolas C. [LGGE, UMR 5183, CNRS-UJF, Grenoble (France); LEGI, UMR 5519, CNRS-UJF-INPG, Grenoble (France); Mathiot, Pierre; Barnier, Bernard [LEGI, UMR 5519, CNRS-UJF-INPG, Grenoble (France); Gallee, Hubert [LGGE, UMR 5183, CNRS-UJF, Grenoble (France)

    2011-04-15

    Air-sea ice-ocean interactions in the Ross Sea sector form dense waters that feed the global thermohaline circulation. In this paper, we develop the new limited-area ocean-sea ice-atmosphere coupled model TANGO to simulate the Ross Sea sector. TANGO is built up by coupling the atmospheric limited-area model MAR to a regional configuration of the ocean-sea ice model NEMO. A method is then developed to identify the mechanisms by which local coupling affects the simulations. TANGO is shown to simulate realistic sea ice properties and atmospheric surface temperatures. These skills are mostly related to the skills of the stand alone atmospheric and oceanic models used to build TANGO. Nonetheless, air temperatures over ocean and winter sea ice thickness are found to be slightly improved in coupled simulations as compared to standard stand alone ones. Local atmosphere ocean feedbacks over the open ocean are found to significantly influence ocean temperature and salinity. In a stand alone ocean configuration, the dry and cold air produces an ocean cooling through sensible and latent heat loss. In a coupled configuration, the atmosphere is in turn moistened and warmed by the ocean; sensible and latent heat loss is therefore reduced as compared to the stand alone simulations. The atmosphere is found to be less sensitive to local feedbacks than the ocean. Effects of local feedbacks are increased in the coastal area because of the presence of sea ice. It is suggested that slow heat conduction within sea ice could amplify the feedbacks. These local feedbacks result in less sea ice production in polynyas in coupled mode, with a subsequent reduction in deep water formation. (orig.)

  10. The influence of short-term events on the hydrographic and biological structure of the southwestern Ross Sea

    Science.gov (United States)

    Jones, Randolph M.; Smith, Walker O.

    2017-02-01

    The Ross Sea continental shelf supports very high productivity and phytoplankton biomass. Conventional methods, including ship-based sampling, instrumented moorings, satellite imagery, and modelling, have illustrated the typical patterns of seasonal progression of the phytoplankton blooms. While variability in the Ross Sea is substantial over relatively large scales, our understanding of smaller scales of variability (on the order of a few hours or several kilometers) is limited. Utilizing data from an autonomous glider, we examined the mechanisms driving both the transitions between stages of the phytoplankton bloom and the short-term perturbations in chlorophyll concentrations. Three phases within the bloom were defined based on chlorophyll changes: an accumulation phase, a dissipation period, and a post-dissipation phase. Short-term perturbations in chlorophyll were repeatedly observed and correlated with wind speed. These chlorophyll perturbations were strongly influenced by the degree of temporal coupling between wind events and the depth of mixing, which varied among phases. Delays of 12-24 h between wind events and chlorophyll changes were observed during the accumulation phase, but shortened to 2-12 h in the dissipation phase. Furthermore, while physical factors contributed to the observed short-term reductions in biomass and the appearance of chlorophyll at depth throughout the study, we hypothesize that turbulence during the period of maximum biomass induced aggregate formation and led to rapid vertical flux. These results suggest that the small-scale, short-term physical perturbations may induce substantial vertical redistribution of biogenic material, which in turn can have significant biogeochemical impacts.

  11. Temperature profile and nutrients data collected using bottle casts from the POLAR DUKE and NATHANIEL B. PALMER in the Ross Sea and Southern Oceans from 10 November 1997 to 12 December 1997 (NODC Accession 0000898)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from the POLAR DUKE and NATHANIEL B. PALMER. Data were...

  12. Temperature profile and nutrients data collected using bottle casts from the POLAR DUKE in the Ross Sea and Southern Oceans from 13 November 1996 to 26 November 1996 (NODC Accession 0000895)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from the POLAR DUKE. Data were collected from 13...

  13. Temperature profile and nutrients data collected using bottle casts from the POLAR DUKE in the Ross Sea and Southern Oceans from 06 September 1996 to 12 September 1996 (NODC Accession 0000890)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from POLAR DUKE. Data were collected from 06 September...

  14. Ross Sea oceanographic data, 1983-1987 : USCGC Glacier, January-February 1983; USCGC Polar Sea, January-February 1984; USCGC Polar Star, February 1985; USCGC Polar Sea, February 1987 (NODC Accession 8900108)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and chemical data were collected using CTD casts from USCGC POLAR SEA and other platforms in the Ross Sea from 19 December 1976 to 06 February...

  15. Temperature profile and nutrients data collected using bottle casts from the POLAR DUKE in the Ross Sea and Southern Oceans from 05 February 1992 to 28 February 1992 (NODC Accession 0000888)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from the POLAR DUKE. Data were collected from 05...

  16. Temperature profile and nutrients data collected using bottle casts from the NATHANIEL B. PALMER in the Ross Sea and Southern Oceans from 16 December 1995 to 13 January 1996 (NODC Accession 0000889)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from the NATHANIEL B. PALMER. Data were collected from...

  17. Temperature profile and nutrients data collected using bottle casts from the NATHANIEL B. PALMER in the Ross Sea and Southern Oceans from 09 November 1994 to 08 December 1994 (NODC Accession 0000899)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from the NATHANIEL B. PALMER. Data were collected from...

  18. Temperature profile and nutrients data collected using bottle casts from the POLAR DUKE and NATHANIEL B. PALMER in the Ross Sea and Southern Oceans from 08 April 1997 to 05 May 1997 (NODC Accession 0000897)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from the POLAR DUKE and NATHANIEL B. PALMER. Data were...

  19. Temperature profile and nutrients data collected using bottle casts from the POLAR DUKE AND NATHANIEL B. PALMER in the Ross Sea and Southern Oceans from 12 January 1997 to 09 February 1997 (NODC Accession 0000896)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from the POLAR DUKE and NATHANIEL B. PALMER. Data were...

  20. Temperature profile and nutrients data collected using bottle casts from the POLAR DUKE in the Ross Sea and Southern Oceans from 08 October 1996 to 06 November 1996 (NODC Accession 0000894)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Temperature profile and nutrients data were collected using bottle casts in the Ross Sea and Southern Oceans from POLAR DUKE. Data were collected from 08 October...

  1. Evaluating the relative roles of crustal growth and recycling through continental arc magmatism in the Ross orogen, Antarctica

    Science.gov (United States)

    Hagen-Peter, Graham; Cottle, John

    2017-04-01

    There remains much debate about the mechanisms of the growth and differentiation of continental crust over geologic time, although the geochemical resemblance between continental crust and arc magmatism around the world make subduction-related magmatism a conspicuous candidate. It's clear that both juvenile magmatism and crustal recycling occur at convergent margins, but is it difficult to quantify the roles of these two end-member processes. This is particularly challenging in continental arc settings, where magmas ascend through and interact with thick continental lithosphere of variable—and usually unknown—age and composition. We assess the relative magnitudes of crustal growth and recycling in a 500-km-long segment of the Ross orogen of Antarctica—an archetypal example of a long-lived "Cordilleran-style" continental arc—utilizing an extensive set of zircon Hf (˜70 samples) and whole rock Nd and Sr (15 samples) isotopic data for igneous rocks ranging from gabbro to granite. Initial ɛNd and 87Sr/86Sr values range from +0.1 to -10.3 and ˜0.7044 to 0.7137, respectively. Initial ɛHf values (weighted means of individual analyses from each sample) are predominately negative—ranging from +3.5 to -12.3—potentially interpreted as reflecting a dominant crustal component in the source of the granitoids. However, inherited zircon domains provide evidence for significantly less radiogenic ancient crust in the unexposed basement of the orogen. Additionally, primitive samples (SiO2 69) range in initial ɛHf from approximately +0.8 to -4.0, representing juvenile magmatism with enriched isotopic compositions. While a broader range and lower ɛHf values (+3.5 to -12.3) in more evolved samples from large granitic plutons likely reflect variable degrees of crustal assimilation during differentiation, overlap with the isotopic compositions of primitive samples permits differentiation with relatively minor degrees of crustal assimilation. This qualitative

  2. Monitoring of active layer thermal regime and depth on CALM-S site, James Ross Island, Eastern Antarctic Peninsula

    Science.gov (United States)

    Hrbáček, Filip; Kňažková, Michaela; Nývlt, Daniel; Láska, Kamil; Mueller, Carsten W.; Ondruch, Jakub

    2017-04-01

    Active layer thickness and its dynamic are considered one of the key parameters of permafrost-affected ground. They variability are very sensitive to specific local conditions, especially climate, vegetation, snow cover or soil texture and moisture. To better understand the local variability of active layer thickness in Antarctica, the original Circumpolar Active Layer Monitoring protocol (CALM) was adapted as its southern form (CALM-S) with respect to specific conditions of Antarctica. To date, almost 40 CALM-S sites were registered across the Antarctic continent with the highest density on western Antarctic Peninsula (South Shetlands) and Victoria Land in East Antarctica (McMurdo region). On James Ross Island, CALM-S site was established in February 2014 as the first CALM-S in the eastern Antarctic Peninsula region. The CALM-S site is located near the Johann Gregor Mendel Station on the northern coast of James Ross Island. The area delimited to 80 × 70 m is elevated at 8 to 11 m asl. Geologically it consists of a Holocene marine terrace ( 80% of CALM-S area) with typical sandy material and passes to lithified to poorly disintegrated sedimentary rocks of Cretaceous Whisky Bay Formation ( 20% of CALM-S area) with a more muddy material and a typical bimodal composition. For both geologically different parts of CALM-S site, ground temperature was measured at two profiles at several levels up to 200 cm depth using resistance thermometers Pt100/8 (accuracy ± 0.15 °C). The air temperature at 2 m above surface was monitored at the automatic weather station near Johann Gregor Mendel Station using resistance thermometer Pt100/A (accuracy ± 0.15 °C). Data used in this study were obtained during the period from 1 March 2013 to 6 February 2016. Mechanical probing of active layer depth was performed in 72 grid points at the end of January, or beginning of February in 2014 to 2016. During the whole study period, mean annual air temperature varied between -7.0 °C (2013

  3. Multidisciplinary study of sediments deposited in the Ross Sea (Antarctica) during the last 50 ka: information on changes of ice extent during the glacial-interglacial transition

    Science.gov (United States)

    Del Carlo, Paola; Baneschi, Ilaria; Bertagnini, Antonella; Boschi, Chiara; Cascella, Antonio; Colizza, Ester; Di Roberto, Alessio; Di Vincenzo, Gianfranco; Finocchiaro, Furio; Landi, Patrizia; Lirer, Fabrizio; Pompilio, Massimo; Sagnotti, Leonardo; Sangiorgi, Francesca; Sprovieri, Mario; Wrinkler, Aldo

    2013-04-01

    In the Ross Sea (Antarctica), sedimentation is controlled by the dynamics of the ice shelves, fluctuations of the ice sheets extensions (Eastern and Western) and volcanic activity from several volcanic complex of the Victoria Land. Marine sediments consisting of alternated glacigenic, biogenic and volcanic deposits can be interpreted in terms of changes in paleoclimate and paleoenvironment conditions. In this project we present a multidisciplinary study (comprising tephrostratigraphy, petrology, paleomagnetism, rock magnetism, TIC/TOC geochemistry, Ar/Ar dating, palinology and integrated biostratigraphy of forams and calcareous nannoplankton) of the sediments recovered in selected cores from Ross Sea during 1999 and 2000 cruises and stored in the Italian archive at Museo Nazionale dell'Antartide (Trieste). Results provide new data on local and/or global changes of paleoclimate and paleoenvironmental conditions over the past 50 Ka. Furthermore, the study of the recovered volcanic deposits adds new information about the poorly known, recent volcanic activity in the Victoria Land area.

  4. A seasonal study of dissolved cobalt in the Ross Sea, Antarctica: micronutrient behavior, absence of scavenging, and relationships with Zn, Cd, and P

    Directory of Open Access Journals (Sweden)

    M. A. Saito

    2010-08-01

    Full Text Available We report the distribution of cobalt (Co in the Ross Sea polynya during austral summer 2005–2006 and the following austral spring 2006. The vertical distribution of total dissolved Co (dCo was similar to soluble reactive phosphate (PO43-, with dCo and PO43- showing a significant correlation throughout the water column (r2=0.87. A strong seasonal signal for dCo was observed, with most spring samples having concentrations ranging from ~45–85 pM, whereas summer dCo values were depleted below these levels by biological activity. Surface transect data from the summer cruise revealed concentrations at the low range of this seasonal variability (~30 pM dCo, with concentrations as low as 20 pM observed in some regions where PO43- was depleted to ~0.1 μM. Both complexed Co, defined as the fraction of dCo bound by strong organic ligands, and labile Co, defined as the fraction of dCo not bound by these ligands, were typically observed in significant concentrations throughout the water column. This contrasts the depletion of labile Co observed in the euphotic zone of other ocean regions, suggesting a much higher bioavailability for Co in the Ross Sea. An ecological stoichiometry of 37.6 μmol Co:mol−1 PO43- calculated from dissolved concentrations was similar to values observed in the subarctic Pacific, but approximately tenfold lower than values in the Eastern Tropical Pacific and Equatorial Atlantic. The ecological stoichiometries for dissolved Co and Zn suggest a greater overall use of Zn relative to Co in the shallow waters of the Ross Sea, with a Co:PO43-/Zn:PO43- ratio of 1:17. Comparison of these observed stoichiometries with values estimated in culture studies suggests that Zn is a key micronutrient that likely influences phytoplankton diversity in the Ross Sea. In contrast, the

  5. Sedimentological evidence for a deforming bed in a late Pleistocene glacial sequence from ANDRILL AND-1B, Ross Sea, Antarctica

    Science.gov (United States)

    Cowan, E. A.; Powell, R. D.

    2009-12-01

    A 1,284.87m-long sediment core (AND-1B) was drilled from beneath the McMurdo Ice Shelf sector of the Ross Ice Shelf as part of the Antarctic geological drilling program, ANDRILL. Snapshots of diamictite depositional processes and paleoenvironmental conditions have been interpreted from a nested set of samples collected at overlapping scales of observation. Data used for detailed sedimentological analyses include cm-scale core logging based on x-radiographs of the archive halves in addition to the original core description, bulk samples, and oriented 45 x 70mm thin sections of diamictites for micromorphology analysis. The 5.8m-thick interval studied contains a complete glacial advance-retreat sequence that is bracketed by glacial surfaces of erosion (GSE) at 41.9 and 47.7mbsf recording glacial advance over the core site. 4.6m of subglacial till is deposited above the lower GSE represented by a sequence of thin muddy conglomerate with diverse pebble lithologies, massive clast-rich muddy diamicite, and stratified diamictite with clast-rich and clast-free beds. The sand size fraction of bulk samples and thin sections from the till are dominated by aggregate grains, termed till pellets following terminology used by sedimentologists in the Ross Sea. The core of the pellet may be a lithic grain or stiff till with additional clay plastered on the outside forming rounded grains from angular ones. Till pellets are rounded, spherical to prolate in form and are associated with turbate structures and aligned grains in till thin sections - evidence of rotational deformation. The area beneath an ice shelf in front of a grounding line is recorded by a thin bed of granular particles that transitions to silty claystone stratified with granules. Granular layers are thought to be from periodic winnowing by strong currents focused near the grounding line. The sub-ice shelf transition from proximal grounding line to distal is recorded by a gradational contact between stratified silty

  6. Influence of Ross Sea Bottom Water changes on the warming and freshening of the Antarctic Bottom Water in the Australian-Antarctic Basin

    Directory of Open Access Journals (Sweden)

    K. Shimada

    2012-07-01

    Full Text Available Changes to the properties of Antarctic Bottom Water in the Australian-Antarctic Basin (AA-AABW between the 1990s and 2000s are documented using data from the WOCE Hydrographic Program (WHP and repeated hydrographic surveys. Strong cooling and freshening are observed on isopycnal layers denser than γn = 28.30 kg m−3. Changes in the average salinity and potential temperature below this isopycnal correspond to a basin-wide warming of 1300 ± 200 GW and freshening of 24 ± 3 Gt year−1. Recent changes to dense shelf water in the source regions in the Ross Sea and George V Land can explain the freshening of AA-AABW but not its extensive warming. An alternative mechanism for this warming is a decrease in the supply of AABW from the Ross Sea (RSBW. Hydrographic profiles between the western Ross Sea and George V Land (171–158° E were analyzed with a simple advective-diffusive model to assess the causes of the observed changes. The model suggests that the warming of RSBW observed between the 1970s and 2000s can be explained by a 21 ± 23% reduction in RSBW transport and the enhancement of the vertical diffusion of heat resulting from a 30 ± 7% weakening of the abyssal stratification. The documented freshening of Ross Sea dense shelf water leads to a reduction in both salinity and density stratification. Therefore the direct freshening of RSBW at its source also produces an indirect warming of the RSBW. A simple box model suggests that the changes in RSBW properties and volume transport (a decrease of 6.7% is assumed between the year 1995 and 2005 can explain 51 ± 6% of the warming and 84 ± 10% of the freshening observed in AA-AABW.

  7. Spatial analysis of trends in primary production and relationship with large-scale climate variability in the Ross Sea, Antarctica (1997-2013)

    Science.gov (United States)

    Schine, Casey M. S.; van Dijken, Gert; Arrigo, Kevin R.

    2016-01-01

    Recent studies have documented an increase in sea ice extent and the duration of the ice season in the Ross Sea, Antarctica. We conducted a satellite-based study to quantify changes in net primary production (NPP) and chlorophyll a (Chl a) in response to the observed changes in ice dynamics in the Ross Sea south of 60°S. Our study covers a 16 year time period (1997-2013) and incorporates both the shelf and off-shelf regions of the Ross Sea. We observed significant secular changes in NPP from 1997 to 2013 in the off-shelf region, with NPP increasing on the eastern side and decreasing on the western side of our study area. The changes we observed in NPP are consistent with the changes we observed in sea surface temperature (SST) and open water days (OWDs), decreasing (increasing) on the western (eastern) side of our study area. Finally, we examined the influence of the Southern Annular Mode (SAM) and the El Niño Southern Oscillation (ENSO), on SST, OWDs, Chl a, and NPP in the Ross Sea and observed a significant relationship between the state of the SAM and ENSO and SST, OWDs, and NPP across the study region. The response of OWDs, SST, and NPP to atmospheric forcing by SAM and ENSO was opposite for the shelf and off-shelf regions, such that during a positive phase of SAM or negative phase of ENSO (La Niña), SST, OWDs, and NPP increased on the shelf and decreased in the off-shelf region.

  8. Particularidades genéticas de glaciares de roca en la isla James Ross, Península Antártica Genetic peculiarities of the rock glaciers in the James Ross Island, Antarctic Peninsula

    Directory of Open Access Journals (Sweden)

    J.A. Strelin

    2007-12-01

    Full Text Available Los glaciares de roca se cuentan entre las geoformas criogénicas más notables de la isla James Ross. La génesis de los mismos se atribuye a la convergencia de una serie de condiciones ambientales de origen morfoestructural y morfogenético. Entre las morfoestructurales se destaca la existencia de mesadas basálticas que proveen la materia prima para la cubierta detrítica de los glaciares de roca. Entre las morfogenéticas existen en la isla pequeños glaciares politermales que, sujetos a pequeñas variaciones de temperatura estival, disminución leve de la precipitación y/o variaciones en la intensidad y dirección de los vientos dominantes, comienzan a cubrirse de detritos. Se considera como factor importante en la formación de esta cubierta detrítica, particularmente en su distribución casi homogénea sobre toda la superficie del glaciar, a la llamada oscilación del frente de regelación. Bajo un clima estable y una vez que los detritos alcanzan un espesor próximo al de la capa activa local, disminuye marcadamente la ablación del núcleo glaciar, quedando el mismo sujeto únicamente a la deformación plástica del hielo. Los glaciares de roca estudiados en la isla James Ross poseen cubiertas detríticas que oscilan entre 0,3 m de espesor en sus cabeceras y más de 1 m en su frente. Los núcleos de hielo rara vez superan los 80 m de espesor, y las velocidades de flujo horizontal en el centro del glaciar de roca son del orden de los 0,15 m por año. La formación de estos glaciares de roca junto al de algunas morenas con núcleo de hielo se remonta al cambio climático que dio fin a la pequeña edad de hielo. El calentamiento brusco verificado en los últimos 15 años en el sector norte de Península Antártica está determinando el colapso acelerado de algunas de estas geoformasRock glaciers are considered amongst the most conspicuous landforms of James Ross Island. Their formation follows the convergence of a series of

  9. Transjugular liver biopsy: histological diagnosis success comparing the trucut to the modified aspiration Ross needle Biopsia hepática transjugular: comparação do sucesso diagnóstico histológico entre as agulhas trucut e a aspirativa modificada de Ross

    Directory of Open Access Journals (Sweden)

    Antonio Carlos Maciel

    2003-06-01

    Full Text Available BACKGROUND: Transjugular liver biopsy is an alternative procedure for patients who present contraindications to standard percutaneous procedure. AIM: To compare the rate of histological diagnosis obtained on transjugular liver biopsy with an automated trucut needle and with a modified Ross needle. PATIENTS / METHOD: Eighty-five patients with suspicion of chronic liver diseases and presenting contraindications for percutaneous liver biopsy (coagulopathy, massive ascites, morbid obesity, or chronic renal problems were submitted to 89 transjugular liver biopsies between March 1994 and April 2001 at ''Hospital São José, Irmandade da Santa Casa de Misercórdia'', Porto Alegre, RS, Brazil. Thirty-five patients underwent 36 biopsies with an automated trucut needle, and 50 patients underwent 53 biopsies with a modified Ross needle. RESULTS: Histological diagnosis was reached in 32/35 subjects submitted to transjugular liver biopsy with the trucut needle (91% and in 35/50 (70% submitted to biopsy with the modified Ross needle. Specimens obtained with the trucut needle were significantly larger and less fragmented than those obtained with the Ross needle. CONCLUSION: Transjugular liver biopsy with the automated trucut needle allowed a higher rate of histological diagnosis when compared to the modified Ross needle in patients with suspicion of chronic liver diseases.RACIONAL: A biopsia hepática transjugular é um procedimento alternativo para pacientes que apresentam contra-indicações ao procedimento padrão (percutâneo. OBJETIVO: Comparar o índice de diagnóstico obtido por meio da biopsia hepática transjugular utilizando uma agulha automatizada trucut e uma agulha Ross modificada. MÉTODOS: Oitenta e cinco pacientes com suspeita de doenças hepáticas crônicas e apresentando contra-indicações para biopsia hepática percutânea (coagulopatia, ascite maciça, obesidade mórbida ou problemas renais crônicos foram submetidos a 89 biopsias hep

  10. Infectious RNA transcripts from Ross River virus cDNA clones and the construction and characterization of defined chimeras with Sindbis virus.

    Science.gov (United States)

    Kuhn, R J; Niesters, H G; Hong, Z; Strauss, J H

    1991-06-01

    We have constructed a full-length cDNA clone of the virulent T48 strain of Ross River virus, a member of the alphavirus genus. Infectious RNA can be transcribed from this clone using SP6 or T7 RNA polymerase. The rescued virus has properties indistinguishable from those of the T48 strain of Ross River virus. We have used this clone, together with a full-length cDNA clone of Sindbis virus, to construct chimeric plasmids in which the 5' and the 3' nontranslated regions of the Sindbis and Ross River genomes were exchanged. The nontranslated regions of the two viral genomes differ in both size and sequence although they maintain specific conserved sequence elements. Virus was recovered from all four chimeras. Chimeras containing heterologous 3' nontranslated regions had replicative efficiencies equal to those of the parents. In contrast, the chimeras containing heterologous 5' nontranslated regions were defective in RNA synthesis and virus production, and the severity of the defect was dependent upon the host. Replication of a virus containing a heterologous 5' nontranslated region may be inefficient due to the formation of defective protein-RNA complexes, whereas, the presumptive complexes formed between host or virus proteins and the 3' nontranslated region to promote RNA synthesis appear to function normally in the chimeras.

  11. Intra-seasonal variation in foraging behavior among Adélie penguins (Pygocelis adeliae) breeding at Cape Hallett, Ross Sea, Antarctica

    Science.gov (United States)

    Lyver, P.O.B.; MacLeod, C.J.; Ballard, G.; Karl, B.J.; Barton, K.J.; Adams, J.; Ainley, D.G.; Wilson, P.R.

    2011-01-01

    We investigated intra-seasonal variation in foraging behavior of chick-rearing Adélie penguins, Pygoscelis adeliae, during two consecutive summers at Cape Hallett, northwestern Ross Sea. Although foraging behavior of this species has been extensively studied throughout the broad continental shelf region of the Ross Sea, this is the first study to report foraging behaviors and habitat affiliations among birds occupying continental slope waters. Continental slope habitat supports the greatest abundances of this species throughout its range, but we lack information about how intra-specific competition for prey might affect foraging and at-sea distribution and how these attributes compare with previous Ross Sea studies. Foraging trips increased in both distance and duration as breeding advanced from guard to crèche stage, but foraging dive depth, dive rates, and vertical dive distances travelled per hour decreased. Consistent with previous studies within slope habitats elsewhere in Antarctic waters, Antarctic krill (Euphausia superba) dominated chick meal composition, but fish increased four-fold from guard to crèche stages. Foraging-, focal-, and core areas all doubled during the crèche stage as individuals shifted distribution in a southeasterly direction away from the coast while simultaneously becoming more widely dispersed (i.e., less spatial overlap among individuals). Intra-specific competition for prey among Adélie penguins appears to influence foraging behavior of this species, even in food webs dominated by Antarctic krill.

  12. THE INFLUENCE OF BEE POLLEN ON THE MEAT CHEMICAL COMPOSITION FOR BROILER´S ROSS 308 MUSCLES

    Directory of Open Access Journals (Sweden)

    Juraj Čuboň

    2013-02-01

    Full Text Available The objective ofthe presentstudy was to evaluate the meat chemical composition of breast and thigh muscles for boiler Ross 308after additionthe bee pollenas nutritional supplement to feed mixturein a dose (500 mg.kg-1 and 1500 mg.kg-1 to experimental groups (E1, E2 respectively.The fattening duration was 42days.At the end of the experiment,the results showthat the water contentin experimentalgroups (E1,E2 was higher than control and there were no significant differences (P≤0. 05among the groups,the protein content was higher in the control group than experimental groups (E1,E2 and there were no significant differences(P≤0.05 among the groups.The breast and thigh fat contents in control (2.04%,13.20%washigherthan (E1group (1.61%,12.91% and (E2 group (1.94%,12.25% andthereweresignificant differences (P≥0.05 between control group and experimental (E1, E2 groupsand therewere no significant differences (P≤0.05 in thigh samples.The energy value was higher in the control group than experimental (E1, E2 and there were significant differences (P≥0.05 between control and experimental group(E1 in breast sample.

  13. Critical role for macrophage migration inhibitory factor (MIF) in Ross River virus-induced arthritis and myositis.

    Science.gov (United States)

    Herrero, Lara J; Nelson, Michelle; Srikiatkhachorn, Anon; Gu, Ran; Anantapreecha, Surapee; Fingerle-Rowson, Günter; Bucala, Richard; Morand, Eric; Santos, Leilani L; Mahalingam, Suresh

    2011-07-19

    Arthrogenic alphaviruses, such as Ross River virus (RRV), chikungunya, Sindbis, mayaro and o'nyong-nyong viruses circulate endemically worldwide, frequently causing outbreaks of polyarthritis. The exact mechanisms of how alphaviruses induce polyarthritis remain ill defined, although macrophages are known to play a key role. Macrophage migration inhibitory factor (MIF) is an important cytokine involved in rheumatoid arthritis pathogenesis. Here, we characterize the role of MIF in alphavirus-induced arthritides using a mouse model of RRV-induced arthritis, which has many characteristics of RRV disease in humans. RRV-infected WT mice developed severe disease associated with up-regulated MIF expression in serum and tissues, which corresponded to severe inflammation and tissue damage. MIF-deficient (MIF(-/-)) mice developed mild disease accompanied by a reduction in inflammatory infiltrates and muscle destruction in the tissues, despite having viral titers similar to WT mice. In addition, reconstitution of MIF into MIF(-/-) mice exacerbated RRV disease and treatment of mice with MIF antagonist ameliorated disease in WT mice. Collectively, these findings suggest that MIF plays a critical role in determining the clinical severity of alphavirus-induced musculoskeletal disease and may provide a target for the development of antiviral pharmaceuticals. The prospect being that early treatment with MIF-blocking pharmaceuticals may curtail the debilitating arthritis associated with alphaviral infections.

  14. Palynofacies as indicators of paleoenvironmental changes in a Cretaceous succession from the Larsen Basin, James Ross Island, Antarctica

    Science.gov (United States)

    Carvalho, Marcelo de A.; Ramos, Renato R. Cabral; Crud, Monika Beatriz; Witovisk, Luciana; Kellner, Alexander W. A.; Silva, Helder de P.; Grillo, Orlando N.; Riff, Douglas; Romano, Pedro S. R.

    2013-09-01

    In order to reconstruct the paleoenvironment of one of the most extensive marine Cretaceous successions in the Southern Hemisphere, palynofacies analyses were conducted on 83 samples from the Whisky Bay (Albian-Turonian), Hidden Lake (Coniacian) and Santa Marta (Santonian-Campanian) formations in the Larsen Basin, James Ross Island, Antarctica. Categories of particulate organic matter were counted and investigated by cluster analysis. The trends and parameters of palynofacies constituents were used to reconstruction paleoenvironments based on the existing sedimentological interpretation. The stratigraphic distribution of the four identified palynofacies associations (A-D) reflects a continuous terrestrial influx throughout the succession. From base to top, a conspicuous increase in woody elements, especially non-opaque particles, is observed. This increase in continental elements occurs despite the presence of marine elements. This finding corroborates the sedimentological interpretation of a deeper water paleoenvironment during deposition of the Whisky Bay Formation and initiation of a shallowing-upward trend in the Hidden Lake Formation, culminating with shallow marine shelf environment of the Santa Marta Formation.

  15. Chemical evidence of the changes of the Antarctic Bottom Water ventilation in the western Ross Sea between 1997 and 2003

    Science.gov (United States)

    Rivaro, Paola; Massolo, Serena; Bergamasco, Andrea; Castagno, Pasquale; Budillon, Giorgio

    2010-05-01

    Data from three Italian CLIMA project cruises between 1997 and 2003 were used to obtain sections of the hydrographic and chemical properties of the main water masses across the shelf break off Cape Adare (western Ross Sea, Antarctica). Dissolved oxygen, nitrate and phosphate data were combined on the basis of the Redfield ratio to obtain the quasi-conservative tracers NO (9[NO 3]+[O 2]), PO (135[PO 4]+[O 2]) and phosphate star PO4* ( PO4*=[PO 4]+[O 2]/175-1.95). In 1997 and 2003 the presence of the High Salinity Shelf Water at the bottom depth near the sill was traced by both physical and chemical measurements. In 2001 the Modified Shelf Water, characterized by warmer temperature and by a lower dissolved oxygen content than High Salinity Shelf Water, was observed at the shelf edge. The distribution of the chemical tracers together with the hydrographic observations showed recently formed Antarctic Bottom Water on the continental slope during all of the cruises. These observations were confirmed by the extended optimum multiparameter analysis. The calculated thickness of the new Antarctic Bottom Water, as well as the tracer content, were variable in time and in space. The estimated volume of the new Antarctic Bottom Water and the export of dissolved oxygen and nutrient associated with the overflowing water were different over the examined period. In particular, a lower (˜55%) export was evidenced in 2001 compared to 1997.

  16. Analysis of mercury and other heavy metals accumulated in lichen Usnea antarctica from James Ross Island, Antarctica.

    Science.gov (United States)

    Zvěřina, Ondřej; Láska, Kamil; Cervenka, Rostislav; Kuta, Jan; Coufalík, Pavel; Komárek, Josef

    2014-12-01

    The study was designed to investigate the content and distribution of selected heavy metals (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Fe, Pb and Zn) in samples of fruticose macrolichen Usnea antarctica from James Ross Island. A special emphasis was devoted to mercury and its species (elemental mercury and methylmercury). It was found that mercury contents were relatively high (up to 2.73 mg kg(-1) dry weight) compared to other parts of the Antarctic Peninsula region, while the concentrations of most other elements were within reported ranges. Mercury contents in lichens originating from the interior were higher than those from the coast, which is probably the result of local microclimate conditions. Similar trends were observed for Hg(0) and MeHg(+), whose contents were up to 0.14 and 0.098 mg kg(-1) dry weight, respectively. While mercury did not show a significant correlation with any other element, the mutual correlation of some litophile elements probably refers to the influence on thalli of resuspended weathered material. The influence of habitat and environmental conditions could play an essential role in the bioaccumulation of contaminants rather than just the simple presence of sources. Thus, the study of the thalli of this species can bring a new perspective on the interpretation of contaminant accumulation in lichens of the polar region.

  17. Ice shelf structure from dispersion curve analysis of passive-source seismic data, Ross Ice Shelf, Antarctica

    Science.gov (United States)

    Diez, A.; Bromirski, P. D.; Gerstoft, P.; Stephen, R. A.; Anthony, R. E.; Aster, R. C.; Cai, C.; Nyblade, A.; Wiens, D.

    2015-12-01

    An L-shaped array of three-component short period seismic stations was deployed at the Ross Ice Shelf, Antarctica approximately 100 km south of the ice edge, near 180° longitude, from November 18 through 28, 2014. Polarization analysis of data from these stations clearly shows propagating waves from below the ice shelf for frequencies below 2 Hz. Energy above 2 Hz is dominated by Rayleigh and Love waves propagating from the north. Frequency-slowness plots were calculated using beamforming. Resulting Love and Rayleigh wave dispersion curves were inverted for the shear wave velocity profile, from which we derive a density profile. The derived shear wave velocity profiles differ within the firn for the inversions using Rayleigh and Love wave dispersion curves. This difference is attributed to an effective anisotropy due to fine layering. The layered structure of firn, ice, water, and ocean floor results in a characteristic dispersion curve pattern below 7 Hz. We investigate the observed structures in more detail by forward modeling of Rayleigh wave dispersion curves for representative firn, ice, water, sediment structures. Rayleigh waves are observed when wavelengths are long enough to span the distance from the ice shelf surface to the seafloor. Our results show that the analysis of high frequency Rayleigh waves on an ice shelf has the ability to resolve ice shelf thickness, water column thickness, and the physical properties of the underlying ocean floor using passive-source seismic data.

  18. Mesoscale variability of the summer bloom over the northern Ross Sea shelf: A tale of two banks

    Science.gov (United States)

    Kohut, Josh T.; Kustka, Adam B.; R. Hiscock, Michael; Lam, Phoebe J.; Measures, Chris; Milligan, Allen; White, Angelicque; Carvalho, Filipa; Hatta, Mariko; Jones, Bethan M.; Ohnemus, Daniel C.; Swartz, John M.

    2017-02-01

    Multi-year satellite records indicate an asymmetric spatial pattern in the summer bloom in the Northern Ross Sea, with the largest blooms over the shallows of Pennell Bank compared to Mawson Bank. In 2010-2011, high-resolution spatiotemporal in situ sampling focused on these two banks to better understand factors contributing to this pattern. Dissolved and particulate Fe profiles suggested similar surface water depletion of dissolved Fe on both banks. The surface sediments and velocity observations indicate a more energetic water column over Mawson Bank. Consequently, the surface mixed layer over Pennell Bank was more homogeneous and shallower. Over Mawson Bank we observed a thicker more homogeneous bottom boundary layer resulting from stronger tidal and sub-tidal currents. These stronger currents scour the seafloor resulting in sediments less likely to release additional sedimentary iron. Estimates of the quantum yield of photosynthesis and the initial slope of the photosynthesis-irradiance response were lower over Mawson Bank, indicating higher iron stress over Mawson Bank. Overall, the apparent additional sedimentary source of iron to, and longer surface residence time over Pennell Bank, as well as the reduced fluxes from the more isolated bottom mixed layer over Mawson Bank, sustain the observed asymmetric pattern across both banks.

  19. Spring-time dynamics of diatom communities in landfast and underlying platelet ice in Terra Nova Bay, Ross Sea, Antarctica

    Science.gov (United States)

    Saggiomo, Maria; Poulin, Michel; Mangoni, Olga; Lazzara, Luigi; De Stefano, Mario; Sarno, Diana; Zingone, Adriana

    2017-02-01

    We investigated the composition of diatom communities in annual fast ice and their variations over time during the 1999 austral spring in Terra Nova Bay (Ross Sea, Antarctica). Diatoms varied along the ice core in both cell abundance and species composition, with a minimum in the lower layer and a peak in the platelet ice. Planktonic species constituted in total about 98% of the diatom assemblage in the surface layers of the ice core down to the thickness of 220 cm. In the bottom ice and the underlying platelet-ice layer, the contribution of planktonic diatoms was lower (60% and 65%, respectively) at the beginning of the sampling period, and then decreased further to reach 30% in the bottom ice, where a remarkable biomass increase over time was caused by in situ growth and accumulation of benthic species. By contrast in the platelet-ice layer only small changes were recorded in the composition of the diatom assemblage, which was mainly constituted by the bloom of Fragilariopsis nana. The benthic species are generally not found in the water column, while species in the platelet-ice layer presumably constitute the seed for the initial plankton bloom during the ice-free periods in Terra Nova Bay.

  20. The Influence of Nutrition, Sex and Slaughter Age on Characteristics of Pectoralis Major Muscle at Broiler Chickens Ross-308

    Directory of Open Access Journals (Sweden)

    Adela Marcu

    2014-05-01

    Full Text Available In this paper was studied the effect of dietary energy and protein levels on characteristics of pectoralis major (P. major muscle at broiler chickens, which were sacrificed at 35 and 42 days old. The genetic material was represented by broiler chickens that belonged to the „Ross-308” hybrid, with two groups (LC-control group and LE experimental group. During the growth periods (starter, growing and finishing they have received compound feed ad libitum, with different energy and protein levels (LC-conforming to recommendations of Aviagen Company; LE-higher with 10%. After slaughter, from each group were sampled breast muscles (five per sex and for P. major were determined: the weight, pH value, the thickness of myocytes (fiber diameter, cross-sectional area of fibers. At the LE group, high levels of dietary proteins and energy has significantly influenced pH value and the thickness of myocytes in the P. major muscle, as compared with LC. The sex and slaughter age have significantly influenced the fibers diameter from P. major muscle, that were thicker at female chickens, as compared with male chickens and at 42 days age vs. 35 days. Normal 0 21 false false false RO X-NONE X-NONE

  1. Microbial fossil record of rocks from the Ross Desert, Antarctica: implications in the search for past life on Mars

    Science.gov (United States)

    Wierzchos, Jacek; Ascaso, Carmen

    2002-01-01

    Cryptoendolithic microbial communities living within Antarctic rocks are an example of survival in an extremely cold and dry environment. The extinction of these micro-organisms formerly colonizing sandstone in the Mount Fleming area (Ross Desert), was probably provoked by the hostile environment. This is considered to be a good terrestrial analogue of the first stage of the disappearance of possible life on early Mars. To date, only macroscopically observed indirect biomarkers of the past activity of cryptoendoliths in Antarctic rocks have been described. The present paper confirms, for the first time, the existence of cryptoendolith microbial fossils within these sandstone rocks. The novel in situ application of scanning electron microscopy with backscattered electron imaging and simultaneous use of X-ray energy dispersive spectroscopy allowed the clear detection of microfossils left behind by Antarctic endoliths. Careful interpretation of the morphological features of cells, such as preserved cell walls in algae, fungi and bacteria, cytoplasm elements such as chloroplast membranes in algae and organic matter traces, mineral associations, and the spatial context of these structures all point to their identification as cryptoendolith microfossils. This type of investigation will prompt the development of research strategies aimed at locating and identifying the signs that Martian microbiota, probably only bacteria if they existed, may have been left for us to see.

  2. Segmental anhidrosis with hyporeflexia associated with congenital spinal deformity: A Ross's syndrome variant or inverse Horner's syndrome?

    Directory of Open Access Journals (Sweden)

    Sawhney M

    2004-01-01

    Full Text Available A 39-year-old soldier presented with anhidrosis affecting both upper extremities below the shoulders, the right side of the trunk below the third rib in front and the third vertebra on the back, and the left lower extremity below the inguinal ligament since 1992. Ten years later in 2002, he was also found to have bilateral absence of Achilles reflex and decreased right knee jerk. In addition, the patient was found to have congenital spinal abnormalities in the form of block of vertebrae C3-C4; decreased disc space C4-C5; and break in pars interarticularis L5-S1 with decreased disc space. A total of seven cases of Ross syndrome, Holmes-Adie syndrome (tonic pupil with lost tendon jerks with segmental anhidrosis, have been described in the literature. Our case, however, did not have any pupillary abnormality. A case of progressive isolated segmental anhidrosis has also been described. The association of congenital spinal abnormality, which may be pathognomonic in the causation of this progressive sudomotor degeneration, is quite interesting in our case. The distribution of anhidrosis on the right side is just below the level of sweating loss sometimes described in lesions of superior sympathetic cervical ganglion in Horner's syndrome.

  3. Validation of the Antarctic Snow Accumulation and Ice Discharge Basal Stress Boundary in the South Eastern Region of the Ross Ice Shelf, Antarctica

    Science.gov (United States)

    Nelson, C. B.; King, K.

    2015-12-01

    The largest ice shelf in Antarctic, Ross Ice Shelf, was investigated over the years of (1970-2015). Near the basal stress boundary between the ice shelf and the West Antarctic ice sheet, ice velocity ranges from a few meters per year to several hundred meters per year in ice streams. Most of the drainage from West Antarctica into the Ross Ice Shelf flows down two major ice streams, each of which discharges more than 20 km3 of ice each year. Along with velocity changes, the warmest water below parts of the Ross Ice Shelf resides in the lowest portion of the water column because of its high salinity. Vertical mixing caused by tidal stirring can thus induce ablation by lifting the warm water into contact with the ice shelf. This process can cause melting over a period of time and eventually cause breakup of ice shelf. With changes occurring over many years a validation is needed for the Antarctic Snow Accumulation and Ice Discharge (ASAID) basal stress boundary created in 2003. After the 2002 Larsen B Ice Shelf disintegration, nearby glaciers in the Antarctic Peninsula accelerated up to eight times their original speed over the next 18 months. Similar losses of ice tongues in Greenland have caused speed-ups of two to three times the flow rates in just one year. Rapid changes occurring in regions surrounding Antarctica are causing concern in the polar science community to research changes occurring in coastal zones over time. During the research, the team completed study on the Ross Ice Shelf located on the south western coast of the Antarctic. The study included a validation of the ABSB vs. the natural basal stress boundary (NBSB) along the Ross Ice Shelf. The ASAID BSB was created in 2003 by a team of researchers headed by National Aeronautics and Space Administration Goddard Space Flight Center (NASA GSFC), with an aim of studying coastal deviations as it pertains to the mass balance of the entire continent. The point data file was aimed at creating a replica of the

  4. Coastal-Change and Glaciological Map of the Northern Ross Ice Shelf Area, Antarctica: 1962-2004

    Science.gov (United States)

    Ferrigno, Jane G.; Foley, Kevin M.; Swithinbank, Charles; Williams, Richard S.

    2007-01-01

    Changes in the area and volume of polar ice sheets are intricately linked to changes in global climate, and the resulting changes in sea level could severely impact the densely populated coastal regions on Earth. Melting of the West Antarctic part alone of the Antarctic ice sheet would cause a sea-level rise of approximately 6 meters (m). The potential sea-level rise after melting of the entire Antarctic ice sheet is estimated to be 65 m (Lythe and others, 2001) to 73 m (Williams and Hall, 1993). The mass balance (the net volumetric gain or loss) of the Antarctic ice sheet is highly complex, responding differently to different conditions in each region (Vaughan, 2005). In a review paper, Rignot and Thomas (2002) concluded that the West Antarctic ice sheet is probably becoming thinner overall; although it is thickening in the west, it is thinning in the north. Thomas and others (2004), on the basis of aircraft and satellite laser altimetry surveys, believe the thinning may be accelerating. Joughin and Tulaczyk (2002), on the basis of analysis of ice-flow velocities derived from synthetic aperture radar, concluded that most of the Ross ice streams (ice streams on the east side of the Ross Ice Shelf) have a positive mass balance, whereas Rignot and others (2004) infer even larger negative mass balance for glaciers flowing northward into the Amundsen Sea, a trend suggested by Swithinbank and others (2003a,b; 2004). The mass balance of the East Antarctic ice sheet is thought by Davis and others (2005) to be strongly positive on the basis of the change in satellite altimetry measurements made between 1992 and 2003. Measurement of changes in area and mass balance of the Antarctic ice sheet was given a very high priority in recommendations by the Polar Research Board of the National Research Council (1986), in subsequent recommendations by the Scientific Committee on Antarctic Research (SCAR) (1989, 1993), and by the National Science Foundation?s (1990) Division of Polar

  5. Strontium isotopic geochemistry of the volcanic rocks and associated megacrysts and inclusions from Ross Island and vicinity, Antarctica

    Science.gov (United States)

    Stuckless, J.S.; Ericksen, R.L.

    1976-01-01

    Twelve whole-rock samples of volcanic rocks and a composite of 11 basanitoid samples from Ross Island and vicinity, Antarctica show a narrow range of 87Sr/86Sr ratios from 0.70305 to 0.70339. This range is consistent with a model of differentiation from a single parent magma, but the data allow a 30% variation in the 87Rb/86Sr ratio in the source region if the average ratio is less than 0.057 and if the source region has existed as a closed system for 1.5 b.y. Megacrysts of titaniferous augite, kaersutite, and anorthoclase are isotopically indistinguishable from the host volcanic rocks and therefore are probably cogenetic with the volcanic sequence. A single trachyte sample is isotopically distinct from the rest of the volcanic rocks and probably was contaminated with crustal strontium. Ultramafic and mafic nodules found in association with basanitoids and trachybasalts have 87Sr/86Sr ratios ranging from 0.70275 to 0.70575. Several of these nodules exhibit evidence of reaction with the melt and are isotopically indistinguishable from their hosts, but data for seven granulite-facies nodules show an apparent isochronal relationship. Although this isochron may be fortuitous, the resulting age of 158??22 m.y. is similar to ages reported for the voluminous Ferrar Dolerites, and suggests isotopic re-equilibration within the lower crust and upper mantle. These nodules are not genetically related to the Ferrar Dolerites, as evidenced by their lower initial 87Sr/86Sr ratios. Three ultramafic nodules are texturally and isotopically distinct from the rest of the analyzed nodules. These are friable, have larger 87Sr/86Sr ratios, and may represent a deeper sampling of mantle rock than the granulite-facies nodules. They were, however, derived at a shallower depth than the alkalic magma. Thus they are not genetically related to either the magma or the granulite-facies nodules. ?? 1976 Springer-Verlag.

  6. Applying cusum-based methods for the detection of outbreaks of Ross River virus disease in Western Australia

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    Wright Graeme

    2008-08-01

    Full Text Available Abstract Background The automated monitoring of routinely collected disease surveillance data has the potential to ensure that important changes in disease incidence are promptly recognised. However, few studies have established whether the signals produced by automated monitoring methods correspond with events considered by epidemiologists to be of public health importance. This study investigates the correspondence between retrospective epidemiological evaluation of notifications of Ross River virus (RRv disease in Western Australia, and the signals produced by two cumulative sum (cusum-based automated monitoring methods. Methods RRv disease case notification data between 1991 and 2004 were assessed retrospectively by two experienced epidemiologists, and the timing of identified outbreaks was compared with signals generated from two different types of cusum-based automated monitoring algorithms; the three Early Aberration Reporting System (EARS cusum algorithms (C1, C2 and C3, and a negative binomial cusum. Results We found the negative binomial cusum to have a significantly greater area under the receiver operator characteristic curve when compared with the EARS algorithms, suggesting that the negative binomial cusum has a greater level of agreement with epidemiological opinion than the EARS algorithms with respect to the existence of outbreaks of RRv disease, particularly at low false alarm rates. However, the performance of individual EARS and negative binomial cusum algorithms were not significantly different when timeliness was also incorporated into the area under the curve analyses. Conclusion Our retrospective analysis of historical data suggests that, compared with the EARS algorithms, the negative binomial cusum provides greater sensitivity for the detection of outbreaks of RRv disease at low false alarm levels, and decreased timeliness early in the outbreak period. Prospective studies are required to investigate the potential

  7. Mesoscale variability in intact and ghost colonies of Phaeocystis antarctica in the Ross Sea: Distribution and abundance

    Science.gov (United States)

    Smith, Walker O.; McGillicuddy, Dennis J.; Olson, Elise B.; Kosnyrev, Valery; Peacock, Emily E.; Sosik, Heidi M.

    2017-02-01

    Phaeocystis, a genus with a cosmopolitan distribution and a polymorphic life cycle, was observed during summer in the Ross Sea, Antarctica, where large blooms of this haptophyte regularly occur. The mesoscale vertical and horizontal distributions of colonies of Phaeocystis antarctica were assessed using a towed Video Plankton Recorder (VPR). The mean size of colonies was 1.20 mm, and mean abundances within the three VPR surveys were 4.86, 1.96, and 11.5 mL- 1. In addition to the typical spherical, transparent colonies, the VPR quantified an optically dissimilar form of colony that had a distinctive translucent appearance. It also measured the abundance of collapsed colonies, similar to those observed previously from cultures and mesocosms, which we called "ghost colonies". The translucent colonial form had a different distribution than the more common colonial form, and at times was more abundant. Relative to intact colonies, the ghost colonies occurred less frequently, with mean abundances in the three surveys being 0.01, 0.08, and 0.0004 mL- 1. Ghost colonies generally were found below the euphotic zone, where they often were in greater abundance than intact colonies. However, the relationship of ghost colonies to intact P. antarctica colonies was not direct or consistent, suggesting that the formation of ghost colonies from living colonies and their appearance within the water column were not tightly coupled. Given their relative scarcity and low carbon content, it is unlikely that ghost colonies contribute substantially to vertical flux; however, it is possible that we did not sample periods of major flux events, and as a result minimized the importance of ghost colonies to vertical flux. They do, however, represent a poorly documented feature of polar haptophyte life cycles.

  8. Parasite sources and sinks in a patched Ross-Macdonald malaria model with human and mosquito movement: Implications for control.

    Science.gov (United States)

    Ruktanonchai, Nick W; Smith, David L; De Leenheer, Patrick

    2016-09-01

    We consider the dynamics of a mosquito-transmitted pathogen in a multi-patch Ross-Macdonald malaria model with mobile human hosts, mobile vectors, and a heterogeneous environment. We show the existence of a globally stable steady state, and a threshold that determines whether a pathogen is either absent from all patches, or endemic and present at some level in all patches. Each patch is characterized by a local basic reproduction number, whose value predicts whether the disease is cleared or not when the patch is isolated: patches are known as "demographic sinks" if they have a local basic reproduction number less than one, and hence would clear the disease if isolated; patches with a basic reproduction number above one would sustain endemic infection in isolation, and become "demographic sources" of parasites when connected to other patches. Sources are also considered focal areas of transmission for the larger landscape, as they export excess parasites to other areas and can sustain parasite populations. We show how to determine the various basic reproduction numbers from steady state estimates in the patched network and knowledge of additional model parameters, hereby identifying parasite sources in the process. This is useful in the context of control of the infection on natural landscapes, because a commonly suggested strategy is to target focal areas, in order to make their corresponding basic reproduction numbers less than one, effectively turning them into sinks. We show that this is indeed a successful control strategy-albeit a conservative and possibly expensive one-in case either the human host, or the vector does not move. However, we also show that when both humans and vectors move, this strategy may fail, depending on the specific movement patterns exhibited by hosts and vectors.

  9. Innovazione e sperimentazione. Alcune considerazioni sui “Pionieri” e la prima ceramografia ateniese a figure rosse

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    Elisabetta Pala

    2014-06-01

    Full Text Available L’articolo è incentrato su un gruppo di ceramografi ateniesi a figure rosse, attivi tra il 520 e gli inizi del V sec. a.C., denominati “Pionieri” per l’approccio del tutto nuovo alla pittura vascolare, basato principalmente su un’attenta osservazione della realtà e su un approfondito studio dell’anatomia umana. Saranno discussi gli aspetti più significativi della loro produzione, quali la consapevolezza di sé e del proprio ruolo e lo spirito di rivalità tra i diversi membri del gruppo, che li differenziano dagli altri pittori contemporanei. L’analisi delle forme e delle iconografie dei manufatti da loro prodotti contribuisce a chiarirne la funzione e lo scopo, anche in relazione ai diversi contesti di rinvenimento, in Grecia, principalmente sull’Acropoli ateniese, in Etruria, Magna Grecia e Sicilia. This paper aims to introduce a group of Athenian red-figure painters working since 520 B.C. until the early Fifth century B.C, who got the nick-name “Pioneers”, because of their new approach to vase-painting, especially focused on a careful observation of reality and a broaden study of human anatomy. The most preeminent aspects of their activity will be discussed, such as their self-consciousness, the awareness of their own role, and the spirit of competition among each other, which make them so far from other Late-Archaic painters. The study on shapes and iconography chosen by these painters will shed light on different purposes of their vessels, according to different contexts where they have been found, either in Greece, namely on the Athenian Acropolis, or in Etruria, Magna Graecia, and Sicily.

  10. Early Miocene basement clasts in ANDRILL AND-2A core and their implications for paleoenvironmental changes in the McMurdo Sound region (western Ross Sea, Antarctica)

    Science.gov (United States)

    Talarico, Franco M.; Sandroni, Sonia

    2011-07-01

    A detailed provenance study of gravel-size clasts in the lowermost 438 m of the ANDRILL AND-2A core reveals a pattern of dynamic provenance variations which can be discussed for its implications for Early Miocene paleogeographical reconstructions and glaciological models in the McMurdo Sound region (Ross Sea). Clast distribution patterns and distribution of diagnostic basement clast assemblages indicative of three different provenance areas (Mulock-Skelton glacier, Carlyon-Darwin glacier and Koettlitz-Blue glacier regions) can be interpreted in terms of two distinctive ice dynamic scenarios: i) local fluctuations of outlet Transantarctic Mountains glaciers with dominant flows from W to E to the coast (documented in the lowermost core section, at ca. 20.2-20.1 Ma), and ii) larger volume of ice grounded at the regional scale in the Ross Embayment with flow lines running N-S close to the TAM front (in two periods, at ca. 19.7-19.7 Ma and at ca. 17.8-17.4 Ma). Moreover, in core sections including facies typical of open-marine to iceberg-influenced depositional environments, ice-rafted debris compositions reveal that during periods of glacial-minima setting sites of active calving processes dominantly occurred in areas including the present-day Blue-Koettlitz glacier coast, and subordinately in glacier tongues located further south in the Skelton-Mulock glacier area. Consistently with results of numerical modelling the reconstructed glaciological scenarios provide further constraints to paleogeographical reconstructions and glaciological models at the south-western tip of the Ross Sea during significant steps in Antarctic ice sheet evolution through the Early Miocene climatic events.

  11. Corticosterone in relation to body mass in Adelie penguins (Pygoscelis adeliae) affected by unusual sea ice conditions at Ross Island, Antarctica.

    Science.gov (United States)

    Cockrem, J F; Potter, M A; Candy, E J

    2006-12-01

    Penguins naturally fast each year during breeding and again whilst moulting, and may lose more than 40% of body mass during a fast. Fasting in emperor (Aptenodytes forsteri) and king (Aptenodytes patagonicus) penguins has been divided into three phases, with phase III characterised by an increased rate of body mass loss, increased plasma corticosterone concentrations, and a change in behaviour leading to abandonment of the breeding attempt and return to sea to feed. Initial corticosterone concentrations and corticosterone responses to a handling stressor were measured in the current study to determine if they increase during phase III of fasting in Adelie penguins (Pygoscelis adeliae). The study was conducted in 2001 at the northern Cape Bird colony on Ross Island, Antarctica. Penguin breeding on Ross Island was disrupted in the 2001-2002 summer by a large iceberg (B15A) which stopped the normal movement of sea ice in the Ross Sea. Penguins departing from the Cape Bird colony were lighter than returning or incubating birds (3.39+/-0.10cf. 4.16+/-0.06 and 4.07+/-0.08kg). It is likely that the departing birds were males that had been lighter than normal when they arrived at the colony. Initial plasma corticosterone concentrations were higher in departing than returning or incubating penguins (6.89+/-1.69cf. 2.36+/-0.42 and 1.08+/-0.19ng/ml). Corticosterone responses to handling were also greater in departing penguins. Initial plasma corticosterone, concentrations at 30min and total and corrected integrated corticosterone responses were inversely related to body mass in departing penguins, whereas there were no relationships in arriving penguins. beta-hydroxybutyrate and uric acid concentrations were consistent with departing birds having entered phase III of fasting. The results indicate that corticosterone and corticosterone responses are elevated in phase III of fasting in the Adelie penguin.

  12. One new genus and three new species of deep-sea nematodes (Nematoda: Microlaimidae) from the Southwest Pacific Ocean and Ross Sea.

    Science.gov (United States)

    Leduc, Daniel

    2016-02-11

    New deep-sea nematodes of the family Microlaimidae are described from the Southwest Pacific Ocean and Ross Sea. Microlaimus korari n. sp. is characterised by annulated cuticle with longitudinal bars, round amphideal aperture slightly smaller than the cryptospiral amphideal fovea, spacious and heavily cuticularised buccal cavity with large dorsal tooth and right subventral tooth situated anteriorly relative to left subventral tooth, slender spicules 4.4 cloacal body diameters long, and gubernaculum 1.2 cloacal body diameters long with laterally curved distal end and swollen proximal end. Bolbolaimus tongaensis n. sp. is characterised by annulated cuticle with longitudinal bars, oval amphideal aperture and cryptocircular amphideal fovea situated between cephalic setae and only partially surrounded by cuticle annulations, and short spicules cuticularised along dorsal edge and at proximal end and with swollen portion near proximal end. Maragnopsia n. gen. is characterised by a minute, non-cuticularised mouth cavity without teeth, an elongated posterior pharyngeal bulb more than twice as long as it is wide, a single outstretched testis, and a conico-cylindrical tail 13-16 anal body diameters long. A list of all 83 valid Microlaimus species is provided. The present study provides the first microlaimid species records from deep-sea habitats (> 200 m depth) in the Southwest Pacific and Ross Sea. The presence of M. korari n. sp. on both the continental slope of New Zealand and Ross Sea abyssal plain suggests that this species has a wide geographical and depth distribution. However, molecular analyses will be required to confirm the identity of these two geographically disparate populations.

  13. EVALUACIÓN DEL COMPORTAMIENTO PRODUCTIVO DE LAS LÍNEAS DE POLLOS DE ENGORDE COBB 500 y ROSS 308 AVALIAÇÃO DO DESEMPENHO PRODUTIVO DAS LINHAS DE FRANGOS DE CORTE COBB 500 E ROSS 308 PERFORMANCE EVALUATION OF POULTRY PRODUCTION ON THE LINES OF BROILERS COBB 500 AND ROSS 308

    Directory of Open Access Journals (Sweden)

    JUAN PABLO ROSERO

    2012-06-01

    Full Text Available Con el objetivo de identificar que líneas comerciales de pollos de engorde se comportan mejor productivamente en trópico bajo, se evaluaron las líneas avícolas Ross 308 y Cobb 500. Para ello se utilizaron 160 aves, 80 por cada estirpe y 40 por cada sexo, de un día de edad para evaluar sus parámetros productivos, implementando un diseño completamente al azar con cuatro tratamientos, cuatro repeticiones por tratamiento y 10 aves por repetición, con el fin de determinar el comportamiento entre las variables consumo de alimento, ganancia de peso y conversión alimenticia, para las etapas de iniciación y finalización. A los datos experimentales, se efectuó un análisis de varianza y prueba múltiple de Duncan. Para el análisis económico se utilizo el método de presupuestos parciales. Para la variable consumo de alimento, en la etapa iniciación se encontraron diferencias estadísticas (Pr>F= 0,05 entre tratamientos, contrario a la ganancia de peso y conversión alimenticia, en donde no se reportan diferencias estadísticas (Pr>F= 0,05. En cuanto a la etapa de finalización para consumo de alimento y ganancia de peso se presentaron diferencias estadísticas (Pr>F= 0,05, contrario a conversión alimenticia, donde no se presentaron diferencias. En términos económicos, se determinó que el tratamiento T1 fue el más eficiente.A fim de identificar quais linhas comerciais de frangos de corte se comportar melhor na produtividade tropical baixa, foram avaliadas as linhas de aves Ross 308 e Cobb 500. Para isso, foram utilizadas 160 aves, 80 por corrida e 40 para cada sexo, de um dia de idade para avaliar os parâmetros produtivos, implementação de um delineamento inteiramente casualizado, com quatro tratamentos, quatro repetições por tratamento e 10 aves por repetição, a fim de determinar o comportamento entre as variáveis consumo de ração, ganho de peso e conversão alimentar (g para as fases de iniciação e conclusão. Aos dados

  14. 《茶经》英译的几个问题——以Francis Ross Carpenter和姜欣等英译本为例

    Institute of Scientific and Technical Information of China (English)

    何琼

    2013-01-01

    作者将以Francis Ross Carpenter和姜欣等两个《茶经》英译本为例,探讨《茶经》英译过程中存在的一些问题:如文化意象的英译、茶诗的英译以及篇章语言的英译等问题,期望达到中外译者在典籍翻译过程中能更有效地传播中华文化的目的.

  15. Radio-frequency Attenuation Length, Basal-Reflectivity, Depth, and Polarization Measurements from Moore's Bay in the Ross Ice-Shelf

    CERN Document Server

    Barwick, S W; Besson, D; Duffin, T; Hanson, J C; Klein, S R; Kleinfelder, S A; Reed, C; Roumi, M; Stezelberger, T; Tatar, J; Walker, J; Zou, L

    2014-01-01

    Radio-glaciological parameters from Moore's Bay, in the Ross Ice Shelf, have been measured. The thickness of the ice shelf in Moore's Bay was measured from reflection times of radio-frequency pulses propagating vertically through the shelf and reflecting from the ocean. The average depth obtained is $576\\pm8$ m. The temperature-averaged attenuation length of the ice column, $\\langle L \\rangle$, is derived from the returned power assuming 100\\% reflection. A linear fit to the data yields $\\langle L(\

  16. Measurement of soft X-ray spectrum with ROSS filter system%ROSS滤片法测量软X光谱强度

    Institute of Scientific and Technical Information of China (English)

    孙可煦; 江少恩; 黄天暄; 易荣清; 崔延莉; 王红斌

    2001-01-01

    介绍了ROSS滤片差分法基本原理,给出了ROSS 滤片差分对的理论设计及实际应用差分对的响应函数计算结果.并用此方法获得了激光等离子体发射软 X光谱的绝对强度测量值.最后对软X光谱测量值进行了误差分析和估算.

  17. Consecutive percutaneous valve-in-valve replacement late after Ross procedure: A novel approach in an adult with congenital heart disease.

    Science.gov (United States)

    Wiktor, Dominik M; Kay, Joseph D; Kim, Michael S

    2015-11-15

    The emergence of transcatheter valve technology over the last decade has made significant impact on the treatment of patients with valvular heart disease. There has been increasing experience with both native and valve-in-valve indications with promising results. We present the case of a young woman with congenital heart disease who underwent the Ross procedure for bicuspid aortic valve endocarditis with subsequent reoperation and surgical aortic valve replacement for neo-aortic root dilation who experienced worsening symptoms related to both pulmonary and aortic valve dysfunction. She was successfully treated with percutaneous pulmonary and aortic valve replacement with excellent early term technical results and marked improvement in symptoms.

  18. Preserved Ross-age(?) root beneath the Transantarctic Mountains and origin of the thinner crust beneath the northern Wilkes Subglacial Basin

    Science.gov (United States)

    Jordan, Tom; Ferraccioli, Fausto; Armadillo, Egidio; Bozzo, Emanuele

    2013-04-01

    The Wilkes Subglacial Basin, in the hinterland of the Transantarctic Mountains, represents one of the least understood continental-scale features in Antarctica. Aeromagnetic data suggests that this basin was imposed on a much earlier Ross age back arc region that developed along the former active margin of the East Antarctic Craton (Ferraccioli et al., 2009, Tectonophysics). However, the deeper crustal structure of the basin and its relation with tectonic evolution remains both disputed and poorly constrained. Here, we present new airborne gravity data that reveal the crustal architecture of the northern Wilkes Subglacial Basin. Our gravity models indicate that the crust under the northern Wilkes Subglacial Basin is likely to be 30-35 km thick, i.e. 5-10 km thinner than imaged under the adjacent Transantarctic Mountains, and ~15 km thinner than predicted from some previous flexural and passive seismic models beneath the southern Wilkes Subglacial Basin region. We infer that crustal thickening under northern Victoria Land reflects Ross-age (ca 500 Ma) orogenic events and accretion, followed by partial preservation of the orogenic root since then, as opposed to reflecting the edge of a Mesozoic plateau, which has previously been inferred to have occupied West Antarctica (Bialas et al. 2007, Geology). Airy isostatic anomalies along both flanks of the Wilkes Basin reveal major inherited tectonic structures, which likely controlled the basin location and hence support aeromagnetic interpretations of the Wilkes Subglacial Basin as a structurally controlled basin. The positive anomaly along the western margin of the basin appears to define the tectonic boundary between the East Antarctic Craton and the Ross Orogen, and the anomaly along its eastern flank is interpreted as reflecting high-grade and denser rocks of the central Wilson Terran,e with respect to lower grade meta-sediments and magmatic arc rocks of the western Wilson Terrane and Wilkes Basin region. Our forward

  19. Different responses of Ross River virus to climate variability between coastline and inland cities in Queensland, Australia.

    Science.gov (United States)

    Tong, S; Hu, W

    2002-11-01

    To examine the potential impact of climate variability on the transmission of Ross River virus (RRv) infection, and to assess the difference in the potential predictors of RRv incidence in coastline and inland regions, Queensland, Australia. Information on the RRv cases notified between 1985 to 1996 was obtained from the Queensland Department of Health. Climate and population data were supplied by the Australian Bureau of Meteorology and the Australia Bureau of Statistics, respectively. The function of cross correlations was used to compute a series of correlations between climate variables (rainfall, maximum temperature, minimum temperature, relative humidity, and high tide) and the monthly incidence of RRv disease over a range of time lags. Time series Poisson regression models were performed to adjust for the autocorrelations of the monthly incidences of RRv disease and the confounding effects of seasonality, the case notification time, and population sizes. The cross correlation function shows rainfall, maximum temperature, minimum temperature, and relative humidity at a lag of 1-2 months and high tide in the current month were significantly associated with the monthly incidence of RRv in the coastline region. Relative humidity and rainfall at a lag of two months was also significantly associated with the monthly incidence of RRv in the inland region. The results of Poisson regressive models show that the incidence of RRv disease was significantly associated with rainfall, maximum temperature, minimum temperature, relative humidity, and high tide in the coastline region, and with rainfall and relative humidity in the inland region. There was a significant interaction between climate variables and locality in RRv transmission. Climate variability may have played a significant role in the transmission of RRv. There appeared to be different responses of RRv to climate variability between coastline and inland cities in Queensland, Australia. Maximum temperature

  20. Physical and biological forcing of mesoscale variability in the carbonate system of the Ross Sea (Antarctica) during summer 2014

    Science.gov (United States)

    Rivaro, Paola; Ianni, Carmela; Langone, Leonardo; Ori, Carlo; Aulicino, Giuseppe; Cotroneo, Yuri; Saggiomo, Maria; Mangoni, Olga

    2017-02-01

    Water samples (0-200 m) were collected in a coastal area of the Ross Sea in January 2014 to evaluate the physical and biological forcing on the carbonate system at the mesoscale (distance between stations of 5-10 km). Remote sensing supported the determination of the sampling strategy and helped positioning each sampling station. Total alkalinity, pH, dissolved oxygen, phytoplankton pigments and composition were investigated in combination with measurements of temperature, salinity and current speed. Total inorganic carbon, sea water CO2 partial pressure and the saturation state (Ω) for calcite and aragonite were calculated from the measured total alkalinity and pH. In addition, continuous measurements of atmospheric CO2 concentration were completed. LADCP measurements revealed the presence of a significant change in current speed and direction that corresponded to a clearly defined front characterized by gradients in both temperature and salinity. Phytoplankton biomass was relatively high at all stations and the highest values of chlorophyll-a were found between 20 to 50 m, with the dominant taxonomic group being haptophyceae. The carbonate system properties in surface waters exhibited mesoscale variability with a horizontal length scale of about 10 km. Sea-ice melt, through the input of low salinity water, results in a dilution of the total alkalinity and inorganic carbon, but our observations suggest that phytoplankton activity was the major forcing of the distribution of the carbonate system variables. Higher CO3-, Ω and pH in the surface layer were found where the highest values of chlorophyll-a were observed. The calculated ΔpCO2 pattern follows both MODIS data and in situ chlorophyll-a measurements, and the estimated CO2 fluxes ranged from -0.5 ± 0.4 to -31.0 ± 6.4 mmol m- 2 d- 1. The large range observed in the fluxes is due to both the spatial variability of sea water pCO2 and to the episodic winds experienced.

  1. Active layer monitoring at CALM-S site near J.G.Mendel Station, James Ross Island, eastern Antarctic Peninsula.

    Science.gov (United States)

    Hrbáček, Filip; Kňažková, Michaela; Nývlt, Daniel; Láska, Kamil; Mueller, Carsten W; Ondruch, Jakub

    2017-12-01

    The Circumpolar Active Layer Monitoring - South (CALM-S) site was established in February 2014 on James Ross Island as the first CALM-S site in the eastern Antarctic Peninsula region. The site, located near Johann Gregor Mendel Station, is labelled CALM-S JGM. The grid area is gently sloped (<3°) and has an elevation of between 8 and 11ma.s.l. The lithology of the site consists of the muddy sediments of Holocene marine terrace and clayey-sandy Cretaceous sedimentary rocks, which significantly affect the texture, moisture content, and physical parameters of the ground within the grid. Our objective was to study seasonal and interannual variability of the active layer depth and thermal regime at the CALM-S site, and at two ground temperature measurement profiles, AWS-JGM and AWS-CALM, located in the grid. The mean air temperature in the period March 2013 to February 2016 reached -7.2°C. The mean ground temperature decreased with depth from -5.3°C to -5.4°C at 5cm, to -5.5°C to -5.9°C at 200cm. Active layer thickness was significantly higher at AWS-CALM and ranged between 86cm (2014/15) and 87cm (2015/16), while at AWS-JGM it reached only 51cm (2013/14) to 65cm (2015/16). The mean probed active layer depth increased from 66.4cm in 2013/14 to 78.0cm in 2014/15. Large differences were observed when comparing the minimum (51cm to 59cm) and maximum (100cm to 113cm) probed depths. The distribution of the active layer depth and differences in the thermal regime of the uppermost layer of permafrost at CALM-S JGM clearly show the effect of different lithological properties on the two lithologically distinct parts of the grid. Copyright © 2017 Elsevier B.V. All rights reserved.

  2. Proximity to mosquito breeding habitat and Ross River virus risk in the Peel region of Western Australia.

    Science.gov (United States)

    Jardine, Andrew; Neville, Peter J; Lindsay, Michael D A

    2015-02-01

    It is intuitive that vector-borne disease exposure risk is related to proximity to sources of vector breeding, but this aspect rarely receives empirical testing. The population of Western Australia (WA) is increasing rapidly, with many new residential developments proposed in close proximity to mosquito breeding habitat. However, potential mosquito-borne disease risks for future residents are given little consideration by planning authorities. The Peel region is one of the fastest growing regions in WA and regularly experiences a large number of cases of the mosquito-borne Ross River virus (RRV) disease with epidemics occuring in the region every few years. A spatial analysis of RRV disease data in the Peel region was undertaken to determine the risk associated with proximity to a mosquito breeding habitat. Geographic Information Systems (GIS) software was used to create buffers between 1 and 6 km from the breeding habitat. The number of cases per 1000 dwellings in each buffer was calculated between 2002/03 to 2011/12 for years with >100 cases across all buffers (n=5) in addition to the cumulative rate over the entire period in each buffer. Residents living within 1 km of a mosquito breeding habitat had a significantly higher rate of RRV disease compared to the background rate across the Peel region in all individual years investigated. The cumulative data over the 10-year study period showed that residents in the 1- and 2-km buffers had a significantly higher rate, whereas those living between 3 and 6 km away did not. This study demonstrates an increased mosquito-borne disease risk associated with living in close proximity to a mosquito breeding habitat in a rapidly expanding region of WA and highlights the importance of considering mosquito-borne disease risks when planning authorities assess new residential development applications. Known mosquito breeding wetlands should be incorporated into land use planning scheme maps to ensure that they are accurately

  3. Holocene laminated biogenic mud in Wood Bay (western Ross Sea, Antarctica): geochemical data and preliminary paleoclimatic interpretation.

    Science.gov (United States)

    Colizza, Ester; Finocchiaro, Furio; Giglio, Federico; Kuhn, Gerhard; Langone, Leonardo; Presti, Massimo

    2010-05-01

    The study of LGM and Holocene marine sediments is an important goal in Antarctic research and needs high-resolution sequences to reconstruct paleoclimatic events in detail. Literature reports a large number of data coming from inner-shelf bays and fjords, especially around Antarctic peninsula, but also from western Ross Sea. In this note we discuss compositional data from a gravity core (BAY05-45c; 74° 09.7' S, 165° 57.7' E; water depth: 1058 m; core length: 445.5 cm) collected in 2005 during the Italian PNRA cruise into the inner part of Wood Bay, in front of the Aviator Ice tongue. Wood Bay sea floor morphology is charcterised by a narrow basin, deeper than 1,000 m, oriented WNW-ESE, and transversally connected, by a 800-m deep sill, to the Drygalski basin, streching NE-SW. Core sediment is composed by laminated biosiliecous mud, with a strong hydrogen sulphide odour and black in colour. Within a few days from core sampling, sediment became oxidized: laminae colour ranges from dark (from dark olive grey to black) to light (from olive grey to olive). Some lighter laminae have cotton-like texture. Data set include X-ray images, magnetic susceptibility, AMS 14C dating, organic carbon, biogenic silica, XRF-scan of major and minor elements. Discussion of the data will point out inferences about sedimentary processes, paleoproductivity and oceanographic conditions during the Holocene. The most apparent feature is the occurrence, down-core, of at least two intervals of increased productivity, characterised by higher organic carbon and biogenic silica. Within such intervals, a few cm-thick levels show peaks of biogenic silica, as well as of barium, which correspond to relatively lows in organic carbon contents. Organic carbon content is higher in darker laminae, whereas lighter and fluffy laminae display an increased percentage of biogenic silica. Such levels probably mark a rapid and not persistent change in phytoplankton assemblage compositions.

  4. Predicting responses of the Adélie penguin population of Edmonson Point to future sea ice changes in the Ross Sea

    Directory of Open Access Journals (Sweden)

    Tosca eBallerini

    2015-02-01

    Full Text Available Atmosphere-Ocean General Circulation Models (AOGCMs predict changes in the sea ice environment and in atmospheric precipitations over larger areas of Antarctica. These changes are expected to affect the population dynamics of seabirds and marine mammals, but the extent of this influence is not clear. We investigated the future population trajectories of the colony of Adélie penguins at Edmonson Point, in the Ross Sea, from 2010 to 2100. To do so, we incorporated the relationship between sea ice and demographic parameters of the studied colony into a matrix population model. Specifically, we used sea ice projections from AOGCMs and a proxy for snowfall precipitation. Simulations of population persistence under future climate change scenarios showed that a reduction in sea ice extent and an increase in precipitation events during the breeding season will drive the population to extinction. However, the population growth rate estimated by the model was lower than the population growth rate observed during the last decades, suggesting that recruits from other colonies maintain the observed population dynamics at Edmonson Point. This local ‘rescue’ effect is consistent with a metapopulation dynamic for Adélie penguins in the Ross Sea, in which neighboring colonies might exhibit contrasting population trends and different density-dependent effects. In the hypothesis that connectivity with larger source colonies or that local recruitment would decrease, the sink colony at Edmonson Point is predicted to disappear.

  5. Were West Antarctic Ice Sheet grounding events in the Ross Sea a consequence of East Antarctic Ice Sheet expansion during the middle Miocene?

    Science.gov (United States)

    Bart, Philip J.

    2003-11-01

    Seismic correlation of glacial unconformities from the Ross Sea outer continental shelf to chronostratigraphic control at DSDP sites 272 and 273 indicates that at least two West Antarctic Ice Sheet (WAIS) expansions occurred during the early part of the middle Miocene (i.e. well before completion of continental-scale expansion of the East Antarctic Ice Sheet (EAIS) inferred from δ 18O and eustatic shifts). Therefore, if the volume of the EAIS was indeed relatively low, and if the Ross Sea age model is valid, then these WAIS expansions/contractions were not a direct consequence of EAIS expansion over the Transantarctic Mountains onto West Antarctica. An in-situ development of the WAIS during the middle Miocene suggests that either West Antarctic land elevations were above sea level and/or that air and water temperatures were sufficiently cold to support a marine-based ice sheet. Additional chronostratigraphic and lithologic data are needed from Antarctic margins to test these speculations.

  6. The Sinking and Spreading of The Antarctic Deep Ice Shelf Water In The Ross Sea Studied By In Situ Observaions and Numerical Modeling

    Science.gov (United States)

    Rubino, A.; Budillon, G.; Pierini, S.; Spezie, G.

    The sinking and spreading of the Deep Ice Shelf Water (DISW) in the Ross Sea are analyzed using in situ observations and the results of a nonlinear, reduced-gravity, frontal layered numerical "plume" model which is able to simulate the motion of a bottom-arrested current over realistic topography. The model is forced by prescribing the thickness of the DISW vein as well as its density structure at the southern model boundary. The ambient temperature and salinity are imposed using hydrographic data acquired by the Italian PNRA-CLIMA project. In the model water of the quiescent ambient ocean is allowed to entrain in the active deep layer due to a simple param- eterization of turbulent mixing. The importance of forcing the model with a realistic ambient density is demonstrated by carrying out a numerical simulation in which the bottom active layer is forced using an idealized ambient density. In a more realis- tic simulation the path and the density structure of the DISW vein flowing over the Challenger Basin are obtained and are found to be in good agreement with data. The evolution of the deep current beyond the continental shelf is also simulated. It provides useful information on the water flow and mixing in a region of the Ross Sea where the paucity of experimental data does not allow for a detailed description of the deep ocean dynamics.

  7. A seasonal study of dissolved cobalt in the Ross Sea, Antarctica: micronutrient behavior, absence of scavenging, and relationships with Zn, Cd, and P

    Directory of Open Access Journals (Sweden)

    M. A. Saito

    2010-12-01

    Full Text Available We report the distribution of cobalt (Co in the Ross Sea polynya during austral summer 2005–2006 and the following austral spring 2006. The vertical distribution of total dissolved Co (dCo was similar to soluble reactive phosphate (PO43−, with dCo and PO43− showing a significant correlation throughout the water column (r2 = 0.87, 164 samples. A strong seasonal signal for dCo was observed, with most spring samples having concentrations ranging from ~45–85 pM, whereas summer dCo values were depleted below these levels by biological activity. Surface transect data from the summer cruise revealed concentrations at the low range of this seasonal variability (~30 pM dCo, with concentrations as low as 20 pM observed in some regions where PO43− was depleted to ~0.1 μM. Both complexed Co, defined as the fraction of dCo bound by strong organic ligands, and labile Co, defined as the fraction of dCo not bound by these ligands, were typically observed in significant concentrations throughout the water column. This contrasts the depletion of labile Co observed in the euphotic zone of other ocean regions, suggesting a much higher bioavailability for Co in the Ross Sea. An ecological stoichiometry of 37.6 μmol Co:mol−1 PO43− calculated from dissolved concentrations was similar to values observed in the subarctic Pacific, but approximately tenfold lower than values in the Eastern Tropical Pacific and Equatorial Atlantic. The ecological stoichiometries for dissolved Co and Zn suggest a greater overall use of Zn relative to Co in the shallow waters of the Ross Sea, with a Co:PO43−/Zn:PO43− ratio of 1:17. Comparison of these observed stoichiometries with values estimated in culture studies suggests that Zn is a key micronutrient that likely influences phytoplankton diversity in the Ross

  8. FECAL EXCRETION OF Salmonella Enteritidis IN BROILER LINES ROSS AND ISA LABEL EXCREÇÃO FECAL de Salmonella Enteritidis EM DUAS LINHAGENS DE FRANGOS DE CORTE

    Directory of Open Access Journals (Sweden)

    Adson Santa Cruz Oliveira

    2007-12-01

    Full Text Available

    The invasive capacity and persistence of this pathogen, crop and ceca in apparently healthy birds of two broiler lines raised without growth promoter antibiotics in ration and originated from eggs inoculated eggshell and in allantoidal cavity with Salmonella Enteritidis. Histological and bacteriological exams from cecal and crop were performed with one, seven, 14 and 21 days of age after hatch in broilers of fast and slow growing rate. Bacterio-logical exams were performed fecal excretion with one, eigth, 22 and 35 days. The Salmonella Enteritidis invaded and colonizated the gastrointestinal tract of the two lines tested, but the the infection reduced with age, and was more persistant in Ross broilers. The results were different for two lines. The pathogen was excreted from just one chick of ISA Label at 22 days of age and four Ross chicks until 35 days of age. In order, Salmonella was detected in 87.5% (14/16 and 38,1% (5/16 of ceca; in 81.2% (13/16 and 12.5% (2/16 of crops; in fast and slow growing rate lines, respectively. In apparent healthy organs, excepted the crop, an inflammatory process with predominance of macrophage and lymphocytes. The slow growing rate line was effective to eliminate bacteria in the organism.

    Key-words: Ceca, crop, fecal excretion, inflammation.

    Avaliaram-se, neste estudo, a capacidade inva-siva, a persistência e a freqüência de excreção fecal da Salmonella Enteritidis em aves aparentemente saudáveis de duas linhagens de frango de corte, criadas sem antibióticos promotores de crescimento na ração e oriundas de ovos inoculados na casca ou na cavidade alantóide com Salmonella Enteritidis fagotipo 4. Realizaram-se exames bacteriológicos das excretas com um, oito, 22 e 35 dias, e histológicos e bacteriológicos do inglúvio e ceco, com um, sete, quatorze e 21 dias pós-eclosão em frangos de crescimento rápido e lento. Salmonella

  9. BASEMAP, Ross COUNTY, USA

    Data.gov (United States)

    Federal Emergency Management Agency, Department of Homeland Security — FEMA Framework Basemap datasets comprise six of the seven FGDC themes of geospatial data that are used by most GIS applications (Note: the seventh framework theme,...

  10. Ad fontes / Kristiina Ross

    Index Scriptorium Estoniae

    Ross, Kristiina, 1955-

    2011-01-01

    Arvustus: Kaju, Katre. Vive hodie, cras vivere serum est: humanistlik-kristlik haridustraditsioon ja Riia pastori Adam Andreae reisialbum (1696–1702). Tartu : Tartu Ülikooli Kirjastus, 2011 (Dissertationes studiorum graecorum et latinorum Universitatis Tartuensis ; 5 )

  11. Keele salaelu / Kristiina Ross

    Index Scriptorium Estoniae

    Ross, Kristiina

    2004-01-01

    Vana Testamendi eestikeelsest tõlkest, mille tegid ajavahemikul 1687-1690 isa ja poeg Andreas ja Adrian Virginius. Rmt.: Esimene Moosese raamat. Iiobi raamat / tõlkinud 1687-1690 Andreas ja Adrian Virginius. Tallinn, 2003

  12. Reading Bangkok, Ross King

    Directory of Open Access Journals (Sweden)

    Jean Baffie

    2012-09-01

    Full Text Available Cet ouvrage est un essai de compréhension globale de la capitale thaïlandaise. À ce titre, il doit être salué car il a peu d’équivalent. L’ouvrage que l’anthropologue australien Marc Askew a publié en 2002 sur Bangkok – probablement le plus abouti sur cette ville – était, lui, davantage une réunion de monographies (Askew 2002, Baffie 2007. Néanmoins, il faut bien avouer que ce livre déçoit alors qu’il est loin d’être franchement raté et apporte même des idées intéressantes. Mais comment ne p...

  13. Ad fontes / Kristiina Ross

    Index Scriptorium Estoniae

    Ross, Kristiina, 1955-

    2011-01-01

    Arvustus: Kaju, Katre. Vive hodie, cras vivere serum est: humanistlik-kristlik haridustraditsioon ja Riia pastori Adam Andreae reisialbum (1696–1702). Tartu : Tartu Ülikooli Kirjastus, 2011 (Dissertationes studiorum graecorum et latinorum Universitatis Tartuensis ; 5 )

  14. Keele salaelu / Kristiina Ross

    Index Scriptorium Estoniae

    Ross, Kristiina

    2004-01-01

    Vana Testamendi eestikeelsest tõlkest, mille tegid ajavahemikul 1687-1690 isa ja poeg Andreas ja Adrian Virginius. Rmt.: Esimene Moosese raamat. Iiobi raamat / tõlkinud 1687-1690 Andreas ja Adrian Virginius. Tallinn, 2003

  15. Laura's Disillusionment in Katherine Mansfield's The Garden Party

    Institute of Scientific and Technical Information of China (English)

    许东方

    2002-01-01

    Disillusionment seems Mansfield's favourite subject ; she devotes her short life to the art of the short story ;she develops the writing style of short story and influences the following short story writers a great deal.

  16. Soil thermal properties at two different sites on James Ross Island in the period 2012/13

    Science.gov (United States)

    Hrbáček, Filip; Láska, Kamil

    2015-04-01

    James Ross Island (JRI) is the largest island in the eastern part of the Antarctic Peninsula. Ulu Peninsula in the northern part of JRI is considered the largest ice free area in the Maritime Antarctica region. However, information about permafrost on JRI, active layer and its soil properties in general are poorly known. In this study, results of soil thermal measurements at two different sites on Ulu Peninsula are presented between 1 April 2012 and 30 April 2013. The study sites are located (1) on an old Holocene marine terrace (10 m a. s. l.) in the closest vicinity of Johann Gregor Mendel (JGM) Station and (2) on top of a volcanic plateau named Johnson Mesa (340 m a. s. l.) about 4 km south of the JGM Station. The soil temperatures were measured at 30 min interval using platinum resistance thermometers Pt100/8 in two profiles up to 200 cm at JGM Station and 75 cm at Johnson Mesa respectively. Decagon 10HS volumetric water content sensors were installed up 30 cm at Johnson Mesa to 50 cm at JGM Station, while Hukseflux HFP01 soil heat flux sensors were used for direct monitoring of soil physical properties at 2.5 cm depth at both sites. The mean soil temperature varied between -5.7°C at 50 cm and -6.3°C at 5 cm at JGM Station, while that for Johnson Mesa varied between -6.9°C at 50 cm and -7.1°C at 10 cm. Maximum active layer thickness estimated from 0 °C isotherm reached 52 cm at JGM Station and 50 cm at Johnson Mesa respectively which corresponded with maximum observed annual temperature at 50 cm at both sites. The warmest part of both profiles detected at 50 cm depth corresponded with maximum thickness of active layer, estimated from 0°C isotherm, reached 52 cm at JGM Station and 50 cm at Johnson Mesa respectively. Volumetric water content at 5 cm varied around 0.25 m3m-3 at both sites. The slight increase to 0.32 m3m-3 was observed at JGM Station at 50 cm and at Johnson Mesa at 30 cm depth. Soil texture analysis showed distinctly higher share of coarser

  17. Regulation of type I-interferon responses in the human epidermal melanocyte cell line SKMEL infected by the Ross River alphavirus.

    Science.gov (United States)

    Assi, Mohamad; Thon-Hon, Vincent Gérard; Jaffar-Bandjee, Marie-Christine; Martinez, Audrey; Gasque, Philippe

    2015-12-01

    Melanocytes are melanin-producing cells and with emerging innate immune functions including the expression of antiviral interferon-type I cytokines. We herein ascertained the susceptibility of the human melanocytes to Ross River alphavirus (RRV) infection and analyzed the subsequent immune responses. We demonstrated for the first time that (1) SKMEL-28 melanocyte cell line was susceptible to RRV infection and displaying major cytopathic activities and (2) RRV interfered with the interferon-type I response by altering nuclear translocation of pSTAT1 and pSTAT2 in infected SKMEL-28. These results suggest that the human melanoma cell line SKMEL-28 is a valuable model to analyze the mechanisms involved in severe skin manifestations and melanocyte's immunity at the portal of entry of major infection by arboviruses.

  18. Programación en Matlab del algoritmo Nicholson-Ross-Weir para la medida de propiedades dieléctricas

    OpenAIRE

    Rodríguez Villar, Manuel

    2013-01-01

    El objetivo de este proyecto fin de carrera es la programación y validación del método de Nicholson-Ross-Weir a partir de simulaciones de los parámetros de dispersión de una guía de onda cargada con un dieléctrico con pérdidas. Las simulaciones se realizarán con el software comercial CST Microwave Studio, el cual nos proporcionará los parámetros de dispersión de la guía de onda cargada con el dieléctrico, mientras que la metodogía de medida se programará con el software Matlab....

  19. Efectos nutricionales de los polisacáridos no amiláceos en pollo de engorde de la línea Ross

    OpenAIRE

    Diana Patricia Alba-Laverde

    2013-01-01

    Los Polisacáridos no Amiláceos (PNA) son un tipo de carbohidratos presentes en antinutricionales con el fin de disminuir los niveles de grasa corporal. Para esta investigación se contó con tres grupos de pollos de engorde de la línea Ross: al primero se le incluyó alcachofa (Cynara scolymus) en la dieta; al segundo, cebada (Hordeum vulgare), y al tercero se le dejó sólo el alimento balanceado comercial. Como resultado final se obtuvo un menor porcentaje de grasa en canal en los pollos del tra...

  20. Contraste empírico del modelo de cinco fases de duelo de Kübler-Ross en mujeres con cáncer

    Directory of Open Access Journals (Sweden)

    José Moral de la Rubia

    2015-01-01

    Full Text Available Objetivos. (a Definir cinco escalas unidimensionales que permitan evaluar las cinco fases de duelo del modelo de Kübler-Ross y (b contrastar el modelo secuencial de cinco fases de duelo de Kübler-Ross. Método. Se aplicó la escala de las fases de duelo a una muestra no probabilística de 120 mujeres mexicanas con cáncer. Se usó análisis factorial y de senderos para analizar los datos. Resultados. Se definieron cinco modelos unidimensionales de medida para cada fase de duelo con consistencia interna alta, ajuste a los datos y validez de contenido. El modelo secuencial de cinco fases de duelo presentó un ajuste pobre a los datos. Las fases de duelo fueron independientes del tiempo transcurrido desde el diagnóstico de cáncer. Un modelo no secuencial tuvo buen ajuste a los datos. En este modelo, la negación predijo ira, negociación con un ser superior y depresión; por su parte, la ira predijo depresión; negociación con un ser superior predijo aceptación; y depresión predijo menor aceptación. Conclusión. En estas mujeres mexicanas con cáncer, más que una secuencia de fases en el proceso de duelo, se observaron seis respuestas psicológicas que se interrelacionan entre sí y con la pérdida de la salud. Los 39 ítems seleccionados pueden emplearse como una escala de seis factores y dos dimensiones correlacionadas, afecto positivo (promesas/pacto, fe/esperanza y aceptación y afecto negativo (negación, depresión e ira.

  1. New determinations of 40Ar/39Ar isotopic ages and flow volumes for Cenozoic volcanism in the Terror Rift, Ross Sea, Antarctica

    Science.gov (United States)

    Rilling, S.; Mukasa, S.; Wilson, T.; Lawver, L.; Hall, C.

    2009-12-01

    This study provides new determinations of 40Ar/39Ar isotopic ages and flow volumes for submarine and subaerial Neogene volcanism developed within the Terror Rift, Ross Sea, Antarctica, the youngest segment of the West Antarctic Rift System. The study is based on the first dredged samples from seven seamounts north of Ross Island, as well as new data from Franklin and Beaufort Islands. The sampled foidite and basanitic lavas range in age from Quaternary (90 ± 66 ka) on a small seamount ˜10 km north of Franklin Island to 6.80 ± 0.05 Ma on Beaufort Island. These ages are consistent with ages of volcanism in both the Melbourne and Erebus Volcanic Provinces and significantly expand the documented area of Neogene magmatism in Victoria Land. There is no geographic progression of volcanism through time, but volcanism was voluminous in the Pliocene and particularly widespread during the Pleistocene. Two of the dredges sampled edifices comprised of less than 0.2 km3 of volcanic materials. The largest seamount in the study area has 58.8 km3 of volcanic material and represents growth over a period of several thousand years. Estimated minimum eruption rates range from 2 × 10-4 km3 y-1 to 2 × 10-3 km3 y-1, consistent with rates proposed for other rift systems and nearby Mt. Erebus. Recent estimates of extension magnitude for the Terror Rift correspond to minimal decompression of only 0.10 to 0.22 GPa and therefore limited melt output of a typical peridotite source.

  2. Partial pressure (or fugacity) of carbon dioxide, salinity and other variables collected from underway - surface observations using Barometric pressure sensor, Carbon dioxide (CO2) gas analyzer and other instruments from the JAMES CLARK ROSS in the Arctic Ocean, Barents Sea and others from 2012-11-15 to 2013-08-16 (NODC Accession 0115256)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0115256 includes chemical, meteorological, physical and underway - surface data collected from JAMES CLARK ROSS in the Arctic Ocean, Barents Sea,...

  3. Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, Coulometer for DIC measurement and other instruments from JAMES CLARK ROSS in the Indian Ocean, South Atlantic Ocean and Southern Oceans from 2008-12-26 to 2009-01-30 (NODC Accession 0110254)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NCEI Accession 0110254 includes discrete sample and profile data collected from JAMES CLARK ROSS in the Indian Ocean, South Atlantic Ocean and Southern Oceans (>...

  4. Partial pressure (or fugacity) of carbon dioxide, dissolved inorganic carbon, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from the JAMES CLARK ROSS in the South Atlantic Ocean from 1995-03-20 to 1995-05-06 (NODC Accession 0114999)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0114999 includes chemical, discrete sample, physical and profile data collected from JAMES CLARK ROSS in the South Atlantic Ocean from 1995-03-20 to...

  5. Dissolved inorganic carbon, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from the JAMES CLARK ROSS in the South Atlantic Ocean and South Pacific Ocean from 1992-11-01 to 1992-12-08 (NODC Accession 0115024)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0115024 includes chemical, discrete sample, physical and profile data collected from JAMES CLARK ROSS in the South Atlantic Ocean and South Pacific...

  6. Dissolved inorganic carbon, alkalinity, temperature, salinity and other variables collected from discrete sample and profile observations using CTD, bottle and other instruments from the JAMES CLARK ROSS in the North Greenland Sea and Norwegian Sea from 1996-07-20 to 1996-08-22 (NODC Accession 0113757)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NODC Accession 0113757 includes chemical, discrete sample, physical and profile data collected from JAMES CLARK ROSS in the North Greenland Sea and Norwegian Sea...

  7. Operação de Ross: a intervenção ideal para pacientes aórticos jovens?

    Directory of Open Access Journals (Sweden)

    Francisco Diniz Affonso da COSTA

    1997-04-01

    Full Text Available Fundamentos: Próteses valvares aórticas com desempenho hemodinâmico adequado possibilitariam maior regressão da hipertrofia ventricular e normalização da função ventricular. Isto possivelmente tenha implicações importantes no prognóstico tardio após a substituição da valva aórtica. Objetivo: Avaliar o desempenho hemodinâmico do auto-enxerto pulmonar em posição aórtica e a regressão da hipertrofia ventricular esquerda após a operação de Ross. Casuística e Métodos: De maio/95 a março/97, 45 pacientes com média de idades de 27,1 anos foram submetidos à operação de Ross. Todos os pacientes foram submetidos, no pós-operatório imediato, a ecocardiografia com Doppler e cateterismo cardíaco para avaliação do desempenho hemodinâmico dos auto e homoenxertos, assim como da massa e função ventricular esquerda. Catorze pacientes com evolução superior a seis meses submeteram-se a ecocardiografia de stress com dobutamina, para estudar o desempenho hemodinâmico dos auto e homoenxertos em condição de exercício. Resultados: A mortalidade hospitalar foi de 6%. Após tempo médio de seguimento de 12,8 meses (1-23, ocorreu um óbito súbito tardio e nenhuma complicação relacionada à prótese. O desempenho hemodinâmico imediato e tardio dos auto-enxertos foi praticamente normal, com média de gradiente médio de 1,8 ± 0,6 mmHg e média de gradiente instantâneo máximo de 2,9 ± 0,9 mmHg. O grau de insuficiência valvar foi desprezível. Mesmo em condição de exercício, os gradientes não se elevaram de forma significativa, com média de gradiente médio de 4,3 ± 2,5 mmHg e média de gradiente instantâneo máximo de 10,4 ± 6,1 mmHg. Os homoenxertos utilizados para a reconstrução da via de saída do ventrículo direito tiveram excelente desempenho hemodinâmico imediato; entretanto, no seguimento tardio apresentaram discreto aumento das velocidades de fluxo com média de gradiente médio de 10 ± 7,1 mmHg em

  8. 基于Caputo导数的Miller-Ross序列导数微分方程的稳定性分析%Stability Analysis of Fractional Differential Equations with Miller-Ross Sequential Derivative in Caputo Sense

    Institute of Scientific and Technical Information of China (English)

    钱德亮; 李常品

    2012-01-01

    讨论了基于Caputo导数的Miller-Ross序列导数的分数阶微分方程的稳定性.根据Laplace变换,得到分数阶微分方程的解;应用Mittag-Leffler函数的渐近展开,讨论了方程的稳定性.分两部分:齐次方程与非齐次方程.%Stability analysis of the linear fractional differential systems with Caputo derivar tive has been well-studied, the differential system with Miller-Ross sequential derivative in Caputo sense, however, has not been investigated yet. In this paper, by using the Laplace transform and the asymptotical expansion of the Mittag-Leffler function, we derive the stability criteria of the fractional differential systems with Miller-Ross sequential fractional derivative in Caputo sense, where two cases are included: the homogenous case and the non-homogenous one.

  9. Mesoscale and high-frequency variability of macroscopic particles (> 100 μm) in the Ross Sea and its relevance for late-season particulate carbon export

    Science.gov (United States)

    Bochdansky, Alexander B.; Clouse, Melissa A.; Hansell, Dennis A.

    2017-02-01

    The Ross Sea plays a major role in the transfer of organic carbon from the surface into the deep sea due to the combination of high seasonal productivity and Antarctic bottom water formation. Here we present a particle inventory of the Ross Sea based on a combined deployment of a video particle profiler (VPP) and a high-resolution digital holographic microscope (DIHM). Long-distance (100 s of kilometers) and short-distance (10 s of kilometers) sections showed high variability of particle distributions that co-varied with the density structure of the water column. Particle export was apparent at sites of locally weakened pycnoclines, likely an indirect effect of nutrient mixing into the surface layer and local blooms that lead to export. Particle volume abundances at 200-300 m depth were highly correlated with particle volume abundances in the upper mixed layer (export rather than lateral advection. Phaeocystis antarctica (Haptophyta) colonies that were initially retained in the mixed layer sank below the euphotic zone within a period of two weeks. Fine-scale analysis at a resolution < 1 m revealed a significantly overdispersed (i.e., highly patchy) environment in all casts. Patchiness, as determined by the Lloyd index of patchiness and the Index of Aggregation, increased in and below the pycnocline presumably due to aggregation of particles while accumulating on density gradients. In contrast, particles in the upper mixed layer and in the nepheloid layers were more randomly distributed. In 40 of the 84 VPP depth profiles, a periodicity of particle peaks ranged from 10 to 90 m with a mode of 30 m, which can be regarded as the "relevant scale" or "characteristic patch size" of the vertical distribution of particles. While chlorophyll fluorescence and particle mass determined by VPP were significantly correlated at higher particle abundances, the relationship changed from cast to cast, reflecting changes in the relative contribution of fresh phytoplankton to total

  10. Evidence for the Late Cenozoic Antarctic Ice Sheet evolution and bottom current dynamics in the central-western Ross Sea outer margin, Antarctica

    Science.gov (United States)

    Kim, Sookwan; De Santis, Laura; Kuk Hong, Jong; Cottlerle, Diego; Petronio, Lorenzo; Colizza, Ester; Bergamasco, Andrea; Kim, Young-Gyun; Kang, Seung-Goo; Kim, Hyoungjun; Kim, Suhwan; Wardell, Nigel; Geletti, Riccardo; McKay, Robert; Jin, Young Keun; Kang, Sung-Ho

    2016-04-01

    Sedimentary records in polar continental margins provide clues for understanding paleo-depositional environments, related to ice sheet evolution and bottom-water current dynamics, during times of past climate and global sea level changes. Previous seismostratigraphic studies of the Ross Sea embayment, Antarctica, illustrated its general stratigraphic framework and the distribution of glacial sedimentary features over the continental shelf, since the onset of Antarctic ice-sheets at the Eocene-Oligocene boundary (~34.0 Ma). In contrast, there are a fewer studies for the outer continental margin, where continuous sedimentary deposits generally preserve the record of past climate cycles with minimum hiatus, comparing to the inner- and mid-continental shelf, where grounding ice streams eroded most of the sediments. Here we present a seismostratigraphic analysis of 2-D multichannel seismic reflection profiles, from the Central Basin located in the central-western Ross Sea outer margin. A glacial prograding wedge developed at the mouth of the Joides Basin since early-middle Miocene times (RSU4: ~14.0 Ma). And the Central Basin was filled with stacked debris-flow deposits and turbidites. The sediment depocenter shifted from the Central Basin toward the slope in the Pliocene (after RSU2: ~3.3 Ma). Pliocene foreset beds are steep and pinch out at the base of the continental slope. Bottom current controlled sediment drifts well developed since the middle Miocene, along the western slope of the central Basin and on the basement highs These areas are far from the mouth of the Joides trough, where most of the glacial sediment is deposited, and they are also more elevated than the basinal areas, where gravity flow maximum thickness accumulated. Along the western slope of the central Basin and over the basement highs, the signature in the sediments of the action of bottom current reworking and shaping the sea floor can be then clearly recognized. We present the sediment drifts

  11. Phytoplankton assemblages and lipid biomarkers indicate sea-surface warming and sea-ice decline in the Ross Sea during Marine Isotope sub-Stage 5e

    Science.gov (United States)

    Hartman, Julian D.; Sangiorgi, Francesca; Peterse, Francien; Barcena, Maria A.; Albertazzi, Sonia; Asioli, Alessandra; Giglio, Federico; Langone, Leonardo; Tateo, Fabio; Trincardi, Fabio

    2016-04-01

    The Marine Isotope sub-Stage 5e (~ 125 - 119 kyrs BP), the last interglacial period before the present, is believed to have been globally warmer (~ 2°C) than today. Studying this time interval might therefore provide insights into near future climate state given the ongoing climate change and global temperature increase. Of particular interest are the expected changes in polar ice cover. One important aspect of the cryosphere is sea-ice, which influences albedo, deep and surface water currents, and phytoplankton production, and thus affects the global climate system. To investigate whether changes in sea-ice cover occurred in the Southern Ocean close to Antarctica during Marine Isotope sub-Stage 5e dinoflagellate and diatom assemblages have been analyzed in core AS05-10, drilled in the continental slope off the Drygalski basin (Ross Sea) at a water depth of 2377 m. The core was drilled within the frame of the PNRA 2009/A2.01 project, an Italian project with a multidisciplinary approach, and covers the interval from Present to Marine Isotope Stage (MIS) 7. The core stratigraphy is based on diatom bioevents and on the climate cyclicity provided by the variations of the diatom assemblages. For this study we focused on the interval from MIS7 to MIS5. A strong reduction of sea-ice-loving diatom taxa with respect to open water-loving diatom taxa is observed during MIS5. In general the production of phytoplankton increases at the base of MIS5 and then slowly decreases. Dinoflagellate cysts, particularly heterotrophic species, are abundant during MIS5e only. The sea surface temperature reconstruction based on the TEX86L, a proxy based on lipid biomarkers produced by Thaumarcheota, shows a 4°C temperature increase from MIS6 to MIS5e. A slightly smaller temperature increase is observed at the onset of MIS7, but this stage is barren of heterotrophic dinoflagellates. All proxies together seem to indicate that the retreat of the summer sea-ice in the Ross Sea during MIS5e was

  12. Post-LGM grounding line and calving front translations of the West Antarctic Ice Sheet in the Whales Deep paleo-ice-stream trough, eastern Ross Sea, Antarctica

    Science.gov (United States)

    McGlannan, A. J.; Bart, P. J.; Chow, J.

    2016-12-01

    A large-area (2500 km2) multibeam survey of the Whales Deep paleo-ice-stream trough, eastern Ross Sea, Antarctica was acquired during NBP1502B. This sector of the continental shelf is important as it was covered by grounded and floating ice, which drained the central part of an expanded West Antarctic Ice Sheet (WAIS) during the last glacial cycle. The seafloor geomorphology shows a well-defined cluster of four back stepping grounding zone wedges (GZWs) that were deposited in a partly overlapping fashion on the middle continental shelf during WAIS retreat. These observations permit two end-member possibilities for how the WAIS grounding line and calving front vacated the trough. In the first scenario, each GZW represents successive landward shifts of the grounding line and calving front. In the second scenario, each GZW represents a large-scale retreat and re-advance of grounded and floating ice. To determine which of these two end-member scenarios most accurately describes WAIS retreat from this sector of Ross Sea, we evaluated a grid of kasten and piston cores. The core stations were selected on the basis of backstepping GZWs along the trough axis. Our core data analyses included an integration of visual core descriptions, x-ray images, grain size, water content, total organic carbon, shear strengths, and diatom assemblage data. Core data reveal a single transgressive succession from proximal diamict overlain by sub-ice-shelf and/or open-marine sediments. These data strongly support the first scenario, suggesting that an ice shelf remained continuously intact during the time that the grounding line successively moved from the shelf edge to the middle shelf by small-scale landward translations until the end of the fourth grounding event. Sedimentologic and diatom-assemblage data from the inner shelf show that only the last middle shelf grounding event ended with a long-distance retreat of grounded and then floating ice to south of the modern calving front.

  13. Fractionation distribution and preliminary ecological risk assessment of As, Hg and Cd in ornithogenic sediments from the Ross Sea region, East Antarctica

    Energy Technology Data Exchange (ETDEWEB)

    Lou, Chuangneng [Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 (China); Liu, Xiaodong, E-mail: ycx@ustc.edu.cn [Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 (China); Nie, Yaguang [Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 (China); Emslie, Steven D. [Department of Biology and Marine Biology, University of North Carolina Wilmington, 601S. College Road, Wilmington, NC 28403 (United States)

    2015-12-15

    To evaluate mobility of toxic elements and their potential ecological risk caused by seabird biovectors, the fractionation distributions of arsenic (As), mercury (Hg) and cadmium (Cd) were investigated in three ornithogenic sediment profiles from the Ross Sea region, East Antarctica. The results show residual As holds a dominant position, and Hg mainly derives from residual, organic matter-bound and humic acid-bound fractions, indicating weak mobility of As and Hg. However, exchangeable Cd occupies a considerable proportion in studied samples, suggesting Cd has strong mobility. The preliminary evaluation of Sediment Quality Guidelines (SGQs) shows adverse biological effects may occur occasionally for As and Cd, and rarely for Hg. Using Risk Assessment Code (RAC), the ecological risk is assessed at moderate, low and very high for As, Hg and Cd pollution, respectively. Organic matter derived from guano is the main factor controlling the mobility of Hg and Cd through adsorption and complexation. - Highlights: • Residual As holds a dominant position in ornithogenic sediments. • Hg mainly derives from residual, organic matter-bound and humic acid-bound fractions. • Exchangeable Cd occupies a considerable proportion in ornithogenic sediments. • TOC is the main factor controlling the mobility of Hg and Cd in studied sediments.

  14. Persistent organic pollutants (POPs) in the atmosphere of coastal areas of the Ross Sea, Antarctica: Indications for long-term downward trends.

    Science.gov (United States)

    Pozo, Karla; Martellini, Tania; Corsolini, Simonetta; Harner, Tom; Estellano, Victor; Kukučka, Petr; Mulder, Marie D; Lammel, Gerhard; Cincinelli, Alessandra

    2017-07-01

    Passive air samplers were used to evaluate long-term trends and spatial distribution of trace organic compounds in Antarctica. Duplicate PUF disk samplers were deployed at six automatic weather stations in the coastal area of the Ross sea (East Antarctica), between December 2010 and January 2011, during the XXVI Italian Scientific Research Expedition. Among the investigated persistent organic compounds, Hexachlorobenzene was the most abundant, with air concentrations ranging from 0.8 to 50 pg m(-3). In general, the following decreasing concentration order was found for the air samples analyzed: HCB > PeCB > PCBs > DDTs > HCHs. While HCB concentrations were in the same range as those reported in the atmosphere of other Antarctic sampling areas and did not show a decline, HCHs and DDTs levels were lower or similar to those determined one or two decades ago. In general, the very low concentrations reflected the pristine state of the East Antarctica air. Backward trajectories indicated the prevalence of air masses coming from the Antarctic continent. Local contamination and volatilization from ice were suggested as potential sources for the presence of persistent organic pollutants in the atmosphere. Copyright © 2017 Elsevier Ltd. All rights reserved.

  15. The relative roles of modified circumpolar deep water and benthic sources in supplying iron to the recurrent phytoplankton blooms above Pennell and Mawson Banks, Ross Sea, Antarctica

    Science.gov (United States)

    Hatta, Mariko; Measures, Chris I.; Lam, Phoebe J.; Ohnemus, Daniel C.; Auro, Maureen E.; Grand, Maxime M.; Selph, Karen E.

    2017-02-01

    The role that dissolved iron (dFe) rich Circumpolar Deep Water (CDW) might play in sustaining the consistently observed discrete patches of high chlorophyll biomass over Pennell Bank (PB) and Mawson Bank (MB) in the Ross Sea, was investigated during January/February 2011. Over a 26-day period, hydrographic and trace metal clean water sampling was carried out adjacent to both of these banks, in some cases repeatedly. Particulate sampling was also accomplished at selected stations by in situ pumping. The results indicate that the dFe content of the CDW is in fact reduced by on-shelf mixing with Antarctic Surface Water as it transitions into modified CDW (MCDW). Our stations above PB, where the maximum bloom is encountered, show no evidence of MCDW presence. In contrast, above MB, where there is a smaller persistent bloom, MCDW was observed. Although both of these stations displayed the imprint of sedimentary Fe input connected to the strong tidal cycles above the banks, the stronger near-bottom density gradient that MCDW produces appears to contribute to reduced vertical mixing of the sedimentary source. Thus, ironically, the presence of MCDW may be hindering the Fe supply to the surface waters, rather than being the source, as originally hypothesized.

  16. Ross River virus infection surveillance in the Greater Perth Metropolitan area--has there been an increase in cases in the winter months?

    Science.gov (United States)

    Selvey, Linda A; Donnelly, Jenny A; Lindsay, Michael D; PottumarthyBoddu, Sudha; D'Abrera, Victoria C; Smith, David W

    2014-06-30

    An increase in off-season (June to September) Ross River virus (RRV) notifications from the greater Perth metropolitan area was observed from 2006 to 2009. We investigated the increase to determine whether it is likely to have reflected a true increase in off-season cases. A single positive RRV IgM test result is sufficient for RRV notification but where follow-up testing was performed, the positive predictive value of an IgM test where IgG was negative was very low in the off-season and also in the season when using the only commercially available test kit. The increase in off-season notifications was not associated with an increase in off-season testing. Some Perth laboratories use more stringent notification criteria than the nationally agreed RRV case definition, and the geographical distribution of samples tested varies between laboratories. Our findings make a strong case to change the nationally agreed case definition for RRV to not accept a single IgM positive test result as laboratory definitive evidence where the IgG is negative. Our study also identified a range of challenges in interpreting changes in seasonal patterns and geographical distribution of RRV. Any such observed changes should be investigated through further data analysis and/or mosquito trapping and testing in order to assess validity.

  17. Efectos nutricionales de los polisacáridos no amiláceos en pollo de engorde de la línea Ross

    Directory of Open Access Journals (Sweden)

    Diana Patricia Alba-Laverde

    2013-01-01

    Full Text Available Los Polisacáridos no Amiláceos (PNA son un tipo de carbohidratos presentes en antinutricionales con el fin de disminuir los niveles de grasa corporal. Para esta investigación se contó con tres grupos de pollos de engorde de la línea Ross: al primero se le incluyó alcachofa (Cynara scolymus en la dieta; al segundo, cebada (Hordeum vulgare, y al tercero se le dejó sólo el alimento balanceado comercial. Como resultado final se obtuvo un menor porcentaje de grasa en canal en los pollos del tratamiento 1, seguido por los pollos del tratamiento 2, y los mayores porcentajes de grasa en canal fueron los de los pollos del grupo 3 o control. Como resultado adicional, en este grupo 3 se presentaron muertes por Síndrome Ascítico (SA, con lo cual se plantea la posibilidad de emplear los PNA, con el fin de disminuir la presentación de enfermedades metabólicas. 

  18. Widespread collapse of the Ross Ice Shelf during the late Holocene reconstracted from compound specific C-14 and meteoric Be-10

    Science.gov (United States)

    Yokoyama, Y.; Anderson, J. B.; Yamane, M.; Simkins, L. M.; Miyairi, Y.; Yamazaki, T.; Koizumi, M.; Kusahara, K.; Suga, H.; Prothro, L. O.; Hasumi, H.; Southon, J. R.; Ohkouchi, N.

    2016-12-01

    Ice shelves are among the most rapidly changing elements of the modern cryosphere, due to their sensitivity to atmospheric warming and to melting from beneath by warm ocean currents. The marine-based West Antarctic Ice Sheet (WAIS) is vulnerable to future climate change, but the degree to which is not well constrained. Obtaining a better understanding requires geological evidence of retreat history, which is complicated by the lack of proximal marine calcareous sediment, largely preventing construction of a precise chronology. Here we reconstruct the history of Ross Ice Shelf retreat based on compound specific (CS) radiocarbon dating and meteoric 10Be measurement . Taken together with land-based grounding line reconstructions, our results provide strong constraints on numerical glacial models (Yokoyama et al., 2016 PNAS). Dynamic retreat of the ice shelf edge, by as much as 400 km occurred between 5,000 and 1,500 years ago, resulting in a maritime climate for inland Antarctica as recorded in ice cores from Siple Dome and Byrd. This coincided with ocean volume increase observed in far field sea level records (Yokoyama et al., 2012 GRL; Yokoyama et al., 2016 QI). Modeling results indicate that retreat of the ice shelf resulted from combined atmospheric warming and warm ocean currents impinging onto the continental shelf.

  19. Difference in mosquito species (Diptera: Culicidae) and the transmission of Ross River virus between coastline and inland areas in Brisbane, Australia.

    Science.gov (United States)

    Hu, W; Mengersen, K; Dale, P; Tong, S

    2010-02-01

    This study examined the distribution of major mosquito species and their roles in the transmission of Ross River virus (RRV) infection for coastline and inland areas in Brisbane, Australia (27 degrees 28' S, 153 degrees 2' E). We obtained data on the monthly counts of RRV cases in Brisbane between November 1998 and December 2001 by statistical local areas from the Queensland Department of Health and the monthly mosquito abundance from the Brisbane City Council. Correlation analysis was used to assess the pairwise relationships between mosquito density and the incidence of RRV disease. This study showed that the mosquito abundance of Aedes vigilax (Skuse), Culex annulirostris (Skuse), and Aedes vittiger (Skuse) were significantly associated with the monthly incidence of RRV in the coastline area, whereas Aedes vigilax, Culex annulirostris, and Aedes notoscriptus (Skuse) were significantly associated with the monthly incidence of RRV in the inland area. The results of the classification and regression tree (CART) analysis show that both occurrence and incidence of RRV were influenced by interactions between species in both coastal and inland regions. We found that there was an 89% chance for an occurrence of RRV if the abundance of Ae. vigilax was between 64 and 90 in the coastline region. There was an 80% chance for an occurrence of RRV if the density of Cx. annulirostris was between 53 and 74 in the inland area. The results of this study may have applications as a decision support tool in planning disease control of RRV and other mosquito-borne diseases.

  20. 《茶经》文化内涵翻译的“得”与“失”--以 Francis Ross Carpenter 英译本为例%The Gains and Losses of the Chinese Cultural Connotation Translation of the Classic of Tea:A Case Study of the English Version of Francis Ross Carpenter

    Institute of Scientific and Technical Information of China (English)

    何琼

    2015-01-01

    The Classic of Tea written by Lu Yu is an important classic of Chinese tea culture, and its translation is of great significance to the spreading of Chinese tea culture. This paper, from the perspective of culture translation of classics, examines the translation of traditional Chinese culture, such as the ideas of Confucianism, Buddhism and Taoism, based on the English version of The Classic of Tea by Francis Ross Carpenter. The gains and losses of the translation of Chinese cultural connotation in Carpenter’s English version are analyzed through specific examples. It is hoped that this study can provide some reference to the translation of Chinese tea classics and help translators to spread the Chinese culture more effectively in the process of Chinese ancient classics translation.%陆羽撰写的《茶经》是中国茶文化的核心典籍,其英译本对中国茶文化在西方世界的传播具有极大的价值。从典籍文化翻译的视角,重点考察美国译者 Francis Ross Carpenter 的《茶经》英译本中关于儒释道等中国传统文化的翻译效果,并对译者英译过程中准确再现原语负载的文化内涵方面存在的得与失进行综合评价,为茶典籍翻译实践提供借鉴,以促进中国茶文化的有效译介和传播。

  1. Seasonal variation of meteorological variables and recent surface ablation / accumulation rates on Davies Dome and Whisky Glacier, James Ross Island, Antarctica

    Science.gov (United States)

    Láska, K.; Nývlt, D.; Engel, Z.; Budík, L.

    2012-04-01

    In this study, surface mass balance data of two glaciers on James Ross Island, Antarctica, and its spatial and temporal variations are evaluated using snow ablation stakes, ground-penetrating radar, and dGPS measurements. The investigated glaciers are located on the Ulu Peninsula, northern part of James Ross Island. Davies Dome is an ice dome, which originates on the surface of a flat volcanic mesa at elevations >400 m a.s.l. and terminates with a single 700 m wide outlet in the Whisky Bay. Davies Dome has an area of ~6.5 km2 and lies in the altitude range of 0-514 m a.s.l. Whisky Glacier is a cold-based land-terminating valley glacier surrounded by an extensive moraine ridges made of debris-covered ice. The glacier has an area of ~2.4 km2 and lies in the altitude range of 215-520 m a.s.l. Within several summer austral summers, extensive field programme were carried out on both glaciers including the operation of two automatic weather stations, field mapping and mass balance measurements. Each station was equipped with albedometer CM7B (Kipp-Zonen, Netherlands), air temperature and humidity sensor EMS33 (EMS, Czech Republic), propeller anemometer 05103 (Young, USA), and snow depth sensors (Judd, USA). In the period 2009-2011, high seasonal and interdiurnal variability of incoming solar radiation and near-surface air temperature was found as a result of changes in the circulation patterns and synoptic-scale weather systems moving in the Circumpolar Trough. High ablation and accumulation rates were recorded mainly in the spring and summer seasons (October-February), while negligible changes were found in winter (May-September). The effects of positive degree-day temperatures on the surface ablation rates were examined using a linear regression model. In this approach, near-surface air temperature maps on the glacier surfaces were derived from digital elevation model according to actual temperature lapse rates. Mass balance investigations started in 2006 on Davies

  2. A method for assessing the physical recovery of Antarctic desert pavements following human-induced disturbances: a case study in the Ross Sea region of Antarctica.

    Science.gov (United States)

    O'Neill, Tanya A; Balks, Megan R; López-Martínez, Jerónimo; McWhirter, Judi L

    2012-12-15

    With increasing visitor numbers an understanding of the impacts of human activities in Antarctic terrestrial environments has become important. The objective of this study was to develop a means for assessing recovery of the ground surface desert pavement following physical disturbance. A set of 11 criteria were identified to assess desert pavement recovery. Assessed criteria were: embeddedness of surface clasts; impressions of removed clasts; degree of clast surface weathering; % overturned clasts; salt on underside of clasts; development of salt coatings; armouring per m(2); colour contrast; evidence of subsidence/melt out; accumulation of salt on cut surfaces; and evidence of patterned ground development. Recovery criteria were assigned a severity/extent rating on a scale from zero to four, zero being highly disturbed, and four being undisturbed. A relative % recovery for each criteria was calculated for each site by comparison with a nearby undisturbed control area, and an overall Mean Recovery Index (MRI) was assigned to each pavement surface. To test the method, 54 sites in the Ross Sea region of Antarctica were investigated including areas disturbed by: bulldozer scraping for road-fill, contouring for infrastructure, geotechnical investigations, and experimental treading trial sites. Disturbances had occurred at timescales ranging from one week to 50 years prior to assessment. The extent of desert pavement recovery at the sites investigated in this study was higher than anticipated. Fifty of the 54 sites investigated were in an intermediate, or higher, stage of desert pavement recovery, 30 sites were in an advanced stage of recovery, and four sites were indistinguishable from adjacent control sites (MRI = 100%). It was found that active surfaces, such as the gravel beach deposits at the Greenpeace World Park Base site at Cape Evans, the aeolian sand deposits at Bull Pass, and the alluvial fan deposits of the Loop Moraine field campsite, recovered relatively

  3. Poly-brominated diphenyl-ethers (PBDEs) and other persistent organic pollutants in blood of penguins from the Ross Sea (Antarctica)

    Energy Technology Data Exchange (ETDEWEB)

    Corsolini, S.; Ademollo, N.; Mariottini, M.; Focardi, S. [Universita degli Studi di Siena, Siena (Italy)

    2004-09-15

    Polychlorobiphenyls (PCBs), hexachlorobenzene (HCB), polybrominated diphenyl ethers (PBDEs) and dichlorodiphenyl-dichloro ethane (pp'-DDE) including its isomers and metabolites are known as POPs very well. POPs are particularly hazardous to wildlife not only because they are toxic but because they are persistent and distributed on global scale. Polybrominated diphenyl ethers (PBDEs) are a class of POPs used worldwide as flame retardants with an increasing trend in the market demand (67.4 ktons in 2001), but with some restrictions in their usage in Europe. PBDEs are hydrophobic, highly soluble in lipids, resistant to biodegradation and have similar behavior to polychlorinated biphenyls (PCBs) in aquatic and terrestrial ecosystems. Their bioaccumulation and biomagnification properties, as well their global increasing presence, have already been reported by many authors. PBDEs have been detected in remote Arctic regions10 that seem to be their final sink. PBDEs show acute toxicity and a prolonged exposure can affect the function of thyroid and cause neurodevelopmental disorders and estrogenic and hepatic effects. Furthermore, a synergic effect with dioxin-like compounds or other POPs cannot be excluded. The two aims of this study are: (1) to evaluate accumulation levels and patterns of PCBs, PBDEs and chlorinated pesticides in blood samples of the Adelie penguin, Pygoscelis adeliae, the Emperor penguin, Aptenodytes forsteri and the South Polar skua, Cataracta maccormicki from three sites in the Ross Sea (Antarctica); (2) to assess the suitability of blood for the detection of POP residues in supposedly low contaminated organisms that live in protected/ecologically sensitive areas.

  4. The impact of glacier retreat from the Ross Sea on local climate: Characterization of mineral dust in the Taylor Dome ice core, East Antarctica

    Science.gov (United States)

    Aarons, S. M.; Aciego, S. M.; Gabrielli, P.; Delmonte, B.; Koornneef, J. M.; Wegner, A.; Blakowski, M. A.

    2016-06-01

    Recent declines in ice shelf and sea ice extent experienced in polar regions highlight the importance of evaluating variations in local weather patterns in response to climate change. Airborne mineral particles (dust) transported through the atmosphere and deposited on ice sheets and glaciers in Antarctica and Greenland can provide a robust set of tools for resolving the evolution of climatic systems through time. Here we present the first high time resolution radiogenic isotope (strontium and neodymium) data for Holocene dust in a coastal East Antarctic ice core, accompanied by rare earth element composition, dust concentration, and particle size distribution during the last deglaciation. We aim to use these combined ice core data to determine dust provenance, with variations indicative of shifts in either dust production, sources, and/or transport pathways. We analyzed a series of 17 samples from the Taylor Dome (77°47‧47″S, 158°43‧26″E) ice core, 113-391 m in depth from 1.1-31.4 ka. Radiogenic isotopic and rare earth element compositions of dust during the last glacial period are in good agreement with previously measured East Antarctic ice core dust records. In contrast, the Holocene dust dataset displays a broad range in isotopic and rare earth element compositions, suggesting a shift from long-range transported dust to a more variable, local input that may be linked to the retreat of the Ross Ice Shelf during the last deglaciation. Observed changes in the dust cycle inferred from a coastal East Antarctic ice core can thus be used to infer an evolving local climate.

  5. Development and evaluation of an efficient soil-atmosphere model (FHAVeT) based on the Ross fast solution of the Richards equation for bare soil conditions

    Science.gov (United States)

    Tinet, A.-J.; Chanzy, A.; Braud, I.; Crevoisier, D.; Lafolie, F.

    2015-02-01

    In agricultural management, a good timing in operations, such as irrigation or sowing, is essential to enhance both economical and environmental performance. To improve such timing, predictive software are of particular interest. Optimal decision-software would require process modules which provide robust, efficient and accurate predictions while being based on a minimal amount of parameters easily available. The objective of this study is to assess the accuracy of a physically based model with high efficiency. To this aim, this paper develops a coupled model with climatic forcing based on the Ross fast solution for Richards' equation, heat transfer and detailed surface energy balance. The present study is limited to bare soil, but the impact of vegetation can be easily included. The developed model, FHAVeT (Fast Hydro Atmosphere Vegetation Temperature), is evaluated against the coupled model based on the Philip and De Vries (1957) description, TEC. The two models were compared for different climatic and soil conditions. Moreover, the model allows using various pedotransfer functions. The FHAVeT model showed better performance in regards to mass balance, mostly below 0.002 m, and generally improved computation time. In order to allow for a more precise comparison, six time windows were selected. The study demonstrated that the FHAVeT behaviour is quite similar to the TEC behaviour except under some dry conditions. The ability of the models to detect the occurrence of soil intermediate water content thresholds with a 1 day tolerance was also evaluated. Both models agreed in more than 90% of the cases.

  6. Valuation of Indonesian catastrophic earthquake bonds with generalized extreme value (GEV) distribution and Cox-Ingersoll-Ross (CIR) interest rate model

    Energy Technology Data Exchange (ETDEWEB)

    Gunardi,; Setiawan, Ezra Putranda [Mathematics Department, Gadjah Mada University (Indonesia)

    2015-12-22

    Indonesia is a country with high risk of earthquake, because of its position in the border of earth’s tectonic plate. An earthquake could raise very high amount of damage, loss, and other economic impacts. So, Indonesia needs a mechanism for transferring the risk of earthquake from the government or the (reinsurance) company, as it could collect enough money for implementing the rehabilitation and reconstruction program. One of the mechanisms is by issuing catastrophe bond, ‘act-of-God bond’, or simply CAT bond. A catastrophe bond issued by a special-purpose-vehicle (SPV) company, and then sold to the investor. The revenue from this transaction is joined with the money (premium) from the sponsor company and then invested in other product. If a catastrophe happened before the time-of-maturity, cash flow from the SPV to the investor will discounted or stopped, and the cash flow is paid to the sponsor company to compensate their loss because of this catastrophe event. When we consider the earthquake only, the amount of discounted cash flow could determine based on the earthquake’s magnitude. A case study with Indonesian earthquake magnitude data show that the probability of maximum magnitude can model by generalized extreme value (GEV) distribution. In pricing this catastrophe bond, we assumed stochastic interest rate that following the Cox-Ingersoll-Ross (CIR) interest rate model. We develop formulas for pricing three types of catastrophe bond, namely zero coupon bonds, ‘coupon only at risk’ bond, and ‘principal and coupon at risk’ bond. Relationship between price of the catastrophe bond and CIR model’s parameter, GEV’s parameter, percentage of coupon, and discounted cash flow rule then explained via Monte Carlo simulation.

  7. Assessment of current burden of human rabies at Sir Ronald Ross Institute of Tropical and Communicable Diseases (Government Fever Hospital – Five year study

    Directory of Open Access Journals (Sweden)

    Dukkipati Kalyani

    2017-01-01

    Full Text Available Human rabies has been still endemic in India. There are an increasing number of studies estimating the burden of human rabies, but the true incidence of the disease and endemicity were rarely reported in the literature. The main objectives of the present study were to determine the endemicity and to estimate the current burden of human rabies in and around Sir Ronald Ross Institute of Tropical and Communicable Diseases (SRRIT & CD, Nallakunta, Hyderabad. All cases admitted at SRRIT & CD with signs and symptoms of rabies were studied during the period of January 2009 and December 2013. The annual incidence of human rabies in this hospital was estimated to be 152. It is endemic mainly in urban areas that include many areas in Hyderabad and Secunderabad and also adjacent districts. The majority of the patients were children and adult male, from urban areas, and had not taken post exposure prophylaxis (PEP i.e. wound care, active immunization (ARV and passive immunization (RIG. The main animals responsible for bites were dogs (99%, most of which were stray and the most common bite sites were the extremities. Most common clinical feature was hydrophobia. About 92.76% of these patients had not taken PEP. Human rabies continues to be a dreadful disease in India and the dogs are the principal reservoir, mainly stray dogs. This study provides strong evidence that human rabies is still an endemic disease even in urban areas. This is mainly due to lack of awareness about proper PEP. Improved coverage with modern rabies vaccines, control of rabies due to dogs and other animals and intensifying public education about the disease play main role in the reduction of the disease. [J Med Allied Sci 2017; 7(1.000: 14-19

  8. Lithofacies, biofacies, and ichnoassemblage evolution of a shallow submarine volcaniclastic fan-shelf depositional system (Upper Cretaceous, James Ross Island, Antarctica)

    Science.gov (United States)

    Scasso, R. A.; Olivero, E. B.; Buatois, L. A.

    The Upper Cretaceous (Santonian-Campanian/lower Maastrichtian) Santa Marta Formation on James Ross Island, Antarctica, represents volcaniclastic shallow marine fan and shelf sedimentation adjacent to an active volcanic arc. A combined analysis of sedimentologic, paleoecologic, and ichnologic data allows for the recognition in this unit of six lithofacies associations, eight biofacies, and five trace fossils assemblages. Lithofacies are dominated by fine, massive, tuffaceous rocks; graded, turbidite-like tuffaceous sandstones; carbonaceous mudstones; resedimented conglomerates; coquinas; sandstones; silty sandstones; and minor stromatolite beds. Biofacies are defined by different composition and relative abundance of elements of the benthic fauna, mainly bivalves, gastropods, and serpulids, with minor elements represented by scaphopods, corals, brachiopods, and echinoids. Trace fossil assemblages include the most common elements of the Skolithos and Cruziana ichnofacies. A striking result of the analysis is that lithofacies, biofacies, and trace fossil assemblages form distinct, non-repetitive, vertically successive horizons, with their distribution boundaries roughly coincident. On this basis, seven major facies groups, showing a distinct combination of lithofacies, biofacies, and trace fossils, are distinguished in the Santa Marta Formation. These non-repetitive, vertically stacked facies groups reveal a one-way evolution of the depositional system during a transgressive-regressive cycle, with a new transgression at the top of the unit. The lower facies groups represent shallow marine settings with a very high rate of volcaniclastic sedimentation within subsiding basin. Shallow, volcaniclastic fan systems were probably formed at the base of delta slope and grew rapidly as a consequence of high sedimentary supply in equilibrium with basin subsidence. The upper facies groups probably represent sedimentation within the marine part of the envisaged deltaic system on a

  9. Observing Physical and Biological Drivers of pH and O2 in a Seasonal Ice Zone in the Ross Sea Using Profiling Float Data

    Science.gov (United States)

    Briggs, E.; Martz, T. R.; Talley, L. D.; Mazloff, M. R.

    2015-12-01

    Ice cover has strong influence over gas exchange, vertical stability, and biological production which are critical to understanding the Southern Ocean's central role in oceanic biogeochemical cycling and heat and carbon uptake under a changing climate. However the relative influence of physical versus biological processes in this hard-to-study region is poorly understood due to limited observations. Here we present new findings from a profiling float equipped with biogeochemical sensors in the seasonal ice zone of the Ross Sea capturing, for the first time, under-ice pH profile data over a two year timespan from 2014 to the present. The relative influence of physical (e.g. vertical mixing and air-sea gas exchange) and biological (e.g. production and respiration) drivers of pH and O2 within the mixed layer are explored during the phases of ice formation, ice cover, and ice melt over the two seasonal cycles. During the austral fall just prior to and during ice formation, O2 increases as expected due to surface-layer undersaturation and enhanced gas exchange. A small increase in pH is also observed during this phase, but without a biological signal in accompanying profiling float chlorophyll data, which goes against common reasoning from both a biological and physical standpoint. During the phase of ice cover, gas exchange is inhibited and a clear respiration signal is observed in pH and O2 data from which respiration rates are calculated. In the austral spring, ice melt gives rise to substantial ice edge phytoplankton blooms indicated by O2 supersaturation and corresponding increase in pH and large chlorophyll signal. The influence of the duration of ice cover and mixed layer depth on the magnitude of the ice edge blooms is explored between the two seasonal cycles.

  10. Applications of detrital geochronology and thermochronology from glacial deposits to the Paleozoic and Mesozoic thermal history of the Ross Embayment, Antarctica

    Science.gov (United States)

    Welke, Bethany; Licht, Kathy; Hennessy, Andrea; Hemming, Sidney; Pierce Davis, Elizabeth; Kassab, Christine

    2016-07-01

    Till from moraines at the heads of six major outlet glaciers in the Transantarctic Mountains (TAM) and from till beneath three West Antarctic ice streams have a ubiquitous zircon U-Pb age population spanning the time of the Ross/Pan-African Orogenies (610-475 Ma). Geochronology and thermochronology of detrital minerals in these Antarctic glacial tills reveal two different thermal histories for the central and southern TAM. Double-dating of the zircons reveals a geographically widespread (U-Th)/He (ZHe) population of 180-130 Ma in most of the till samples. Sandstone outcrops at Shackleton Glacier, and three Beacon Supergroup sandstone clasts from three moraines, have ZHe ages that fall entirely within this range. The similar population and proximity of many of the till samples to Beacon outcrops lead us to suggest that this extensive ZHe population in the tills is derived from Beacon Supergroup rocks and reflects the thermal response of the Beacon Basin to the breakup of Gondwana. A second population of older (>200 Ma) ZHe ages in tills at the head of Byrd, Nimrod, and Reedy Glaciers. For the tills at the head of the Nimrod and Byrd Glaciers, integrating the double-dated zircon results with 40Ar/39Ar of hornblende, muscovite and biotite, and U-Pb and (U-Th-Sm)/He double-dates on apatite yields a typical pattern of early rapid orogenic cooling (˜4-10°C/Myr) 590-475 Ma after the emplacement of the Granite Harbour Intrusives. Low temperature thermochronometers at these sites yield variable but quite old ages (ZHe 480-70 Ma and AHe 200-70 Ma) that require a long history at low temperature.

  11. China's first intermediate resolution multi-channel seismic survey in the northern Victoria Land Basin and Terror Rift, Ross Sea, Antarctica

    Science.gov (United States)

    Shen, Zhongyan; Gao, Jinyao; Zhang, Tao; Wang, Wei; Ding, Weifeng; Zhang, Sheng

    2017-04-01

    The West Antarctic Rift System (WARS) represents one of the largest active continental rift systems on Earth and is less well known than other rift systems because it is largely covered by thick ice. The Terror Rift (TR), superimposing on the Victoria Land Basin (VLB) in the western Ross Sea, is identified as the most recent deformational zone of the WARS, thus will provide knowledge of the active deformation process of the WARS. The structure and kinematics of the TR is under debate. Originally, the TR was thought to consist of two parts: the Discovery Graben and the magmatically-intruded Lee Arch. New denser seismic grid in the middle and southern segments of the TR revealed a different structure of the Lee Arch while the northern segment of the TR is not well studied. The glacial history of the VLB/TR region is another attractive issue to the geologists since this area records the behavior information of EAIS and WAIS. In the southern part of the VLB, especially in the McMurdo Sound, the framework of the glacial history is well established after several deep cores which recovery the whole stratigraphic sequences since the onset of the glaciation. However, the glacial history of the northern part of the VLB/TR is less well studied and here we emphasize its importance because the northern part of the VLB/TR is a link between the well-studied southern VLB and the sediment-well-preserved Northern Basin. During the 32nd Chinese National Antarctic Research Expedition, on the board of the RV XueLong, we collected intermediate resolution multi-channel seismic reflection data in the northern VLB/TR. These data will establish new constraints on the timing of deformation, structure and kinematics of the TR, and the history of the EAIS and WAIS.

  12. Valuation of Indonesian catastrophic earthquake bonds with generalized extreme value (GEV) distribution and Cox-Ingersoll-Ross (CIR) interest rate model

    Science.gov (United States)

    Gunardi, Setiawan, Ezra Putranda

    2015-12-01

    Indonesia is a country with high risk of earthquake, because of its position in the border of earth's tectonic plate. An earthquake could raise very high amount of damage, loss, and other economic impacts. So, Indonesia needs a mechanism for transferring the risk of earthquake from the government or the (reinsurance) company, as it could collect enough money for implementing the rehabilitation and reconstruction program. One of the mechanisms is by issuing catastrophe bond, `act-of-God bond', or simply CAT bond. A catastrophe bond issued by a special-purpose-vehicle (SPV) company, and then sold to the investor. The revenue from this transaction is joined with the money (premium) from the sponsor company and then invested in other product. If a catastrophe happened before the time-of-maturity, cash flow from the SPV to the investor will discounted or stopped, and the cash flow is paid to the sponsor company to compensate their loss because of this catastrophe event. When we consider the earthquake only, the amount of discounted cash flow could determine based on the earthquake's magnitude. A case study with Indonesian earthquake magnitude data show that the probability of maximum magnitude can model by generalized extreme value (GEV) distribution. In pricing this catastrophe bond, we assumed stochastic interest rate that following the Cox-Ingersoll-Ross (CIR) interest rate model. We develop formulas for pricing three types of catastrophe bond, namely zero coupon bonds, `coupon only at risk' bond, and `principal and coupon at risk' bond. Relationship between price of the catastrophe bond and CIR model's parameter, GEV's parameter, percentage of coupon, and discounted cash flow rule then explained via Monte Carlo simulation.

  13. The oldest elasmosaurs (Sauropterygia, Plesiosauria from Antarctica, Santa Marta Formation (upper Coniacian? Santonian–upper Campanian and Snow Hill Island Formation (upper Campanian–lower Maastrichtian, James Ross Island

    Directory of Open Access Journals (Sweden)

    José P. O'Gorman

    2012-10-01

    Full Text Available Elasmosaurs are recorded for the first time in the Lachman Crags Member (Beta Member of the Santa Marta Formation (lower Campanian and in the Herbert Sound Member of the Snow Hill Island Formation (upper Campanian. These are the first elasmosaurids from James Ross Island, Antarctic Peninsula. These records greatly improve our knowledge of the taxonomic diversity of plesiosaurs of the Santa Marta Formation and Herbert Sound Member of the Snow Hill Island Formation, and extend the lower limit of the record of Elasmosauridae in Antarctica to the lower Campanian, making this the oldest record of an Antarctic elasmosaur.

  14. Synchronous alkaline and subalkaline magmatism during the late Neoproterozoic-early Paleozoic Ross orogeny, Antarctica: Insights into magmatic sources and processes within a continental arc

    Science.gov (United States)

    Hagen-Peter, Graham; Cottle, John M.

    2016-10-01

    Extensive exposure of intrusive igneous rocks along the Ross orogen of Antarctica-an ancient accretionary orogen on the margin of East Gondwana-provides an exceptional opportunity to study continental arc magmatism. There is significant petrologic and geochemical variability in igneous rocks within a 500-km-long segment of the arc in southern Victoria Land. The conspicuous occurrence of carbonatite and alkaline silicate rocks (nepheline syenite, A-type granite, and alkaline mafic rocks) adjacent to large complexes of subalkaline granitoids is not adequately explained by traditional models for continental arc magmatism. Extensive geochemical analysis (> 100 samples) and zircon U-Pb geochronology (n = 70) confirms that alkaline and carbonatitic magmatism was partially contemporaneous with the emplacement of large subduction-related igneous complexes in adjacent areas. Major pulses of subalkaline magmatism were compositionally distinct and occurred at different times along the arc. Large bodies of subalkaline orthogneiss and granite (sensu lato) were emplaced over similar time intervals (ca. 25 Myr) to the north (ca. 515-492 Ma) and south (ca. 550-525 Ma) of the alkaline magmatic province, although the initiation of these major pulses of magmatism was offset by ca. 35 Myr. Alkaline and carbonatitic magmatism spanned at least ca. 550-509 Ma, overlapping with voluminous subalkaline magmatism in adjacent areas. The most primitive rocks from each area have similarly enriched trace element compositions, indicating some common characteristics of the magma sources along the arc. The samples from the older subalkaline complex have invariably low Sr/Y ratios (differentiation. The younger subalkaline complex and subalkaline rocks within the area of the alkaline province extend to higher Sr/Y ratios (up to 300), indicative of generation and differentiation at deeper levels. The significant spatial and temporal diversity in magmatism can be explained by a tectono-magmatic model

  15. New Ross Community Hospital, Hospital Road, New Ross, Wexford.

    LENUS (Irish Health Repository)

    Bowes, John

    2012-08-01

    A number of rheumatoid arthritis (RA) susceptibility genes have been identified in recent years. Given the overlap in phenotypic expression of synovial joint inflammation between RA and psoriatic arthritis (PsA), the authors explored whether RA susceptibility genes are also associated with PsA.

  16. New Ross Community Hospital, Hospital Road, New Ross, Wexford.

    LENUS (Irish Health Repository)

    Bowes, John

    2011-09-01

    To investigate a shared genetic aetiology for skin involvement in psoriasis and psoriatic arthritis (PsA) by genotyping single-nucleotide polymorphisms (SNPs), reported to be associated in genome-wide association studies of psoriasis, in patients with PsA.

  17. Stable Isotopic signatures of Adélie penguin remains provide long-term paleodietary records in Northern Victoria Land (Ross Sea, Antarctica)

    Science.gov (United States)

    Lorenzini, Sandra; Baroni, Carlo; Fallick, Anthony Edward; Baneschi, Ilaria; Salvatore, Maria Cristina; Zanchetta, Giovanni; Dallai, Luigi

    2010-05-01

    The stable isotopes geochemistry of carbon and nitrogen provides a powerful tools for investigating in animal dietary patterns and shifts during the past. The signature of C and N isotopes provide direct information about the diet of an individual and its dietary patterns, especially when the dietary sources consist of prey from different trophic levels (i.e. different C and N isotopic composition) (DeNiro and Epstein 1978, Minawaga and Wada 1984, Koch et al. 1994, Hobson 1995). By analyzing the isotopic composition of penguin remains, we present a new detailed Adélie penguin (Pygoscelis adeliae) paleodietary record for the area of Terra Nova Bay (Victoria Land, Ross Sea). Adélie penguins primarily feed on fish (mainly the silverfish Pleuragramma antarcticum) and krill (Euphausia superba, Euphausia cristallorophias) (Ainley 2002, Lorenzini et al. 2009) that belonging to two different trophic levels. Consequently, they are characterized by different isotopic signatures. Specifically, we analyzed 13C/12C and 15N/14N ratios of more than one thousand of modern and fossil Adélie penguin eggshell and guano samples collected from ornithogenic soils (penguin guano-formed) dated back to ≈7,200 years BP (Baroni and Orombelli 1994, Lambert et al. 2002, Baroni and Hall 2004, Hall et al. 2006). The expanded database of stable isotope values obtained from Adélie penguin remains define a detailed paleodietary record with an excellent temporal continuity over all the investigated time period. Our data indicate a significant dietary shift between fish and krill, with a gradual decrease from past to present time in the proportion of fish compared to krill in Adélie penguin diet. From 7200 yrs BP to 2000 yrs BP, δ13C and δ15N values indicate fish as the most eaten prey. The dietary contribution of lower-trophic prey in penguin diet started becoming evident not earlier than 2000 yrs BP, when the δ13C values reveal a mixed diet based on fish and krill consumption. Modern

  18. Experiência em pacientes com suspeita de hepatopatia crônica e contra-indicação para biópsia hepática percutânea utilizando a agulha de Ross modificada Transjugular liver biopsy: experience in patients with suspected chronic liver disease and contraindication for percutaneous liver biopsy using modified Ross needle

    Directory of Open Access Journals (Sweden)

    A. C. Maciel

    2000-06-01

    Full Text Available OBJETIVOS: O trabalho visou introduzir em nosso meio a técnica de biópsia hepática transjugular orientada por métodos radiológicos para a obtenção do diagnóstico histológico em pacientes clínica e laboratorialmente diagnosticados com hepatopatia crônica e com pelo menos uma das contra-indicações à biópsia hepática percutânea: coagulopatia, ascite maciça e anemia crônica acentuada com insuficiência renal crônica ou obesidade mórbida. MÉTODOS: Biópsia hepática aspirativa foi obtida com agulha de Ross modificada, através da punção da veia jugular interna com cateterização da veia hepática direita sob controle fluoroscópico. RESULTADOS: Trinta e nove pacientes foram estudados, obtendo-se tecido hepático em 32 (82% sendo satisfatório para diagnóstico histológico em 25 (64,1%, com concordância entre o diagnóstico pré e pós-biópsia em 11 (28,2% e discordância em 14 pacientes (35,9%. O procedimento foi bem tolerado pela maioria dos pacientes; contudo um paciente apresentou sangramento retroperitoneal, necessitando cirurgia imediata para controle da hemorragia. CONCLUSÕES: A biópsia hepática transjugular é um método diagnóstico útil para o estudo histopatológico na suspeita de hepatopatia crônica com contra-indicações a biópsia hepática percutânea. Em nossa série foi obtido diagnóstico histopatológico em 64,1% dos indivíduos estudados. Pacientes com suspeita clínica de cirrose tiveram baixo diagnóstico histopatológico (50% quando comparados com indivíduos sem essa suspeita (78,9%. O método é relativamente complexo, podendo apresentar complicações graves, e deve ser realizado em centros de excelência em radiologia e hepatologia.PURPOSE: This work aimed at introducing the transjugular liver biopsy technique oriented by radiologic methods in our hospitals. This technique is indicated for obtaining histopathologic diagnosis in patients clinically and laboratorially suspected of having

  19. Bottom water production variability in the Ross Sea slope during the Late-Pleistocene-Holocene as revealed by benthic foraminifera and sediment geochemistry

    Science.gov (United States)

    Asioli, A.; Langone, L.; Tateo, F.; Giannossi, M. L.; Giglio, F.; Summa, V.; Piva, A.; Ridente, D.; Trincardi, F.

    2009-04-01

    The Antarctic area produces bottom waters that ventilate the vast majority of the deep basins in the rest of the world ocean. The rate of formation in the source area and the strength of these cold bottom waters affect their flow toward the equator and are key factors affecting the Global Thermohaline Circulation during modern and past climate conditions. We present the results of a multidisciplinary study carried out on a core collected in 2377m of water depth on the slope off the Drygalski Basin (Ross Sea), along the modern path of the bottom waters. The goal of this research is to detect a qualitative signal of possible changes in the rate of bottom water production during the Late Pleistocene-Holocene by integrating micropaleontological and geochemical proxies. The micropaleontological signal is represented by the quantitative and qualitative variations of the agglutinated benthic foraminifera assemblages, while the amount of TOC, nitrogen, δ13C, δ15N, biogenic silica, CaCO3 in the sediment, along with the bulk rock mineralogy, provide information on the paleoproductivity and allow reconstruction of changes in the paleocirculation. The chronology is supported by 14C AMS datings on organic matter. Although this study is still in progress, the results obtained allow the following observations: 1) the Holocene sequence includes a major turnover around 8-8.5 calib kyr BP, leading to reduced nutrient utilization, probably reflecting an increased nutrient supply induced by an enhanced Upper Circumpolar Deep Water upwelling; 2) within this general context, the total concentration of benthic foraminifera preserved in the fossil component records millennial scale cycles of variable amplitude after 8.5 calib kyr BP and to present time. This oscillatory trend is paralleled by other parameters, such as the magnetic susceptibility, the dry density, the sheet silicates and the δ15N; 3) minima in foraminifera concentration reflect relatively increased dissolution, weaker

  20. RESEARCH PAPERS : Palaeomagnetism of the Ross of Mull granite complex, western Scotland: lower Palaeozoic apparent polar wander of the Orthotectonic Caledonides

    Science.gov (United States)

    Piper, J. D. A.

    1998-01-01

    The Ross of Mull granite complex was emplaced near the western margin of the Orthotectonic Caledonides of Scotland in early-mid-Silurian times. Anisotropy of magnetic susceptibility reflects the post-tectonic character of the pluton and contrasts with magnetic fabrics in adjoining country rocks which record the regional D3 deformation. Palaeomagnetic study identifies two dominant magnetizations. An `A' component is magnetite-resident with distributed blocking temperatures (100-500°C) and normal polarity (D/I=339/-50°, 30 samples, α95=5.6°, palaeomagnetic pole at 12°E, 1°S, dp/dm=5.0/7.5°) it was probably acquired during initial cooling. A `B' magnetization (unblocking temperatures 500-580°C, D/I=195/+21°, 40 samples, α95=4.3°, palaeomagnetic pole at 339°E, 22°S, dp/dm=2.4/4.5°) is of dual polarity and comparable to magnetizations widely recorded in the Younger Granite Suite of the Scottish Caledonides. It does not correlate with the timing of regional isotopic closure as defined by K/Ar thermochron ages and appears to have been imparted during a regional thermochemical event at low temperatures (~250-150°C) and a late stage of cooling of the orogen (~420-410 Ma). Metamorphic facies in the aureole and adjoining country rocks record examples of both A and B magnetizations, together with a low-blocking-temperature (0-350°C) component acquired during late Palaeozoic/early Mesozoic rifting in the Hebridean Basin. Palaeomagnetic poles from the Orthotectonic Caledonides define a late to post-tectonic magnetization record equivalent to a general east to west apparent polar wander trend of late Ordovician-Lower Devonian age. A short-term reversal of this trend is identified during the earlier part of Silurian times so that mid-late Silurian poles are located in a similar position to late Ordovician poles. The overall path coincides with the contemporaneous record from the Paratectonic Caledonides of England and Wales from c. 455 Ma. It is therefore concluded

  1. Effect of addition of pollen and propolis to feeding mixtures during the production of broiler chickens ROSS 308 to the colour of thigh and breast muscle and pH determination

    Directory of Open Access Journals (Sweden)

    Hana Šulcerová

    2011-01-01

    Full Text Available The aim of this study was to verify influence of pollen and propolis added to the feeding mixture in the diet of broiler chickens Ross 308 to colour breast and thigh muscles in relation to pH values. A total of 198 units 1 day-old Ross 308 hybrid combinations divided into 6 groups according to the feeding mixtures were investigated on meat quality characteristics changes. Muscle colour of breasts and thighs was measured and compared with pH in three times, pH1, pH2 and pHult. Feeding with various additions to feeding mixtures for chicken showed small impact of low content (200 or 300 mg.kg−1 propolis to meat quality characteristics. Higher effect on breast quality was found in group with 400 mg.kg−1 pollen addition to feed, there was faster and deeper postmortal process level found, although without negative impact on meat quality. Meat colour and muscle pH of chicken in this experiment was pale and had low ultimate pH. In these parameters were found correlation. Chicken meat of this experimental animals was paler and had the lowest ultimate pH, altough in group with higher addition it wasn’t confirmed. Raw meat breast pH was significantly lower than thigh muscles in all measurement time. Various feeding especially pollen had significant impact on breast colour which was paler although without negative displays attended of pH decline. Significant relationships are between breast and thigh L*a*b* values and pH1 respectively.

  2. A LA-ICP-MS study of minerals in the Rocche Rosse magmatic enclaves: Evidence of a mafic input triggering the latest silicic eruption of Lipari Island (Aeolian Arc, Italy)

    Science.gov (United States)

    Davì, Marcella; De Rosa, Rosanna; Barca, Donatella

    2009-05-01

    The volcanic products of Lipari Island (Aeolian Arc, Italy) younger than 10 ka are mostly aphyric rhyolitic pumices and obsidians emitted during unusual strombolian-type eruptions, which ended with the emplacement of lava flows. The last volcanic activity on the island dates back to 1230 ± 40 AD, with the extrusion of Rocche Rosse (RR) obsidian lava flow. Recently, mafic enclaves of latitic to trachytic composition have been identified and an evolution process between these enclaves and the rhyolitic magma has been documented in detail [Davì, M., 2007. The Rocche Rosse rhyolitic lava flow (Lipari, Aeolian Islands): magmatological and volcanological aspects. Plinius, supplement to the European Journal of Mineralogy 33, 1-8]. In this work textural and trace-element investigation of mineral phases of the RR enclaves, such as crystals of clinopyroxene, olivine, plagioclase, alkali-feldspar and biotite, was carried out to delineate the most recent feeding system of the island, since such a reconstruction could be significant in terms of hazard forecasting. The results indicate that most of the mineral phases are reversely or oscillatory zoned with respect to both major and trace elements, suggesting an early crystallization under low fO 2 conditions from melts of intermediate composition, followed by a later growth from a more mafic (presumably shoshonitic-basaltic) magma than that from which their cores crystallized. Crystals of magnesium-rich pyroxene and forsteritic-rich olivine are indicative of the presence of this shoshonitic basaltic magma. Based on microanalytical data, it is suggested here that the feeding system of recent Lipari volcanic activity was characterized by a shoshonitic-basaltic magma originating from a deep reservoir, which may have evolved and stopped in the crust, generating zoned magma chambers at different depths, in which latitic and rhyolitic magmas reside. The sudden arrival of a new input of mafic melt may have interacted with these

  3. West Antarctic Ice Sheet Grounding-Line Positions in the Whales Deep Paleo-Ice-Stream Trough of Eastern Ross Sea Inferred From New Multibeam bBathymetry and Seismic Stratigraphy

    Science.gov (United States)

    Bart, P. J.; DeCesare, M.; McGlannan, A. J.; Krogmeier, B.; Danielson, M.

    2016-12-01

    Regional dip-oriented seismic lines and a large-area (2500 km2) multibeam bathymetric survey were acquired during expedition NBP1502B in the Whales Deep paleo-ice-stream trough of eastern Ross Sea. This outer-shelf trough is the downstream continuation of the Bindschadler Ice Stream. The new data provide a more detailed 3D view of the time-transgressive erosional and depositional seafloor features formed during West Antarctic Ice Sheet (WAIS) advance and retreat than was possible to reconstruct with previous reconnaissance-level multibeam and seismic data. The multibeam survey also provides the opportunity to conduct a more detailed analysis of core sedimentology and stratigraphy (McGlannan et al.) that can ultimately be used to investigate grounding-event chronology (DeCesare et al.). The geophysical data show that the WAIS occupied at least four grounding-line positions as it retreated 40 km from the shelf edge to the middle shelf. After the fourth grounding event at the middle shelf, grounded ice retreated abruptly by >200 km to an area/zone south of the modern calving front - where it may have pinned at Roosevelt Island.

  4. Sr, Nd, Pb and Li isotope geochemistry and Ar-Ar dating of alkaline lavas from northern James Ross Island (Antarctic Peninsula) - implications for back-arc magma formation

    Science.gov (United States)

    Kosler, J.; Magna, T.; Mlcoch, B.; Mixa, P.; Hendriks, B. W. H.; Holub, F. V.; Nyvlt, D.

    2009-04-01

    The elemental and isotopic (Sr, Nd, Pb and Li) composition of Cenozoic back-arc alkaline basalts emplaced east of the Antarctic Peninsula in James Ross Island Volcanic Group (JRIVG) is different from the compositions of the fore-arc alkaline volcanic rocks in Southern Shetlands and nearby Bransfield Strait. The variability in elemental and isotopic composition is not consistent with the JRIVG derivation from a single mantle source but rather it suggests that the magma was mainly derived from a depleted mantle with subordinate OIB-like enriched mantle component (EM II). The isotopic data are consistent with mantle melting during extension and possible roll-back of the subducted lithosphere of the Antarctic plate in Miocene to Pliocene times, as indicated by the existing geochronological data and the new Ar-Ar age determinations. Magma contamination by Triassic - Early Tertiary clastic sediments deposited in the back-arc basin was only localized and affected Li isotopic composition in two of the samples, while most of the basalts show very little variation in delta 7Li values, as anticipated for "mantle-driven" Li isotopic composition. These variations are difficult to resolve with radiogenic isotope systematics but Li isotopes may prove sensitive in tracking complex geochemical processes acting through the oceanic crust pile, including hydrothermal leaching and seawater equilibration.

  5. Symposium on job creation and job destruction in transition countries / John Haltiwanger, Hartmut Lehmann, Katherine Terrell

    Index Scriptorium Estoniae

    Haltiwanger, John

    2003-01-01

    Ülevaade 2002. aasta aprillis Costa Rical toimunud konverentsi Labour Markets in Emerging Economies raames toimunud sümpoosiumist ning sealsetest ettekannetest, milles käsitleti tööjõu voolavusega seotud küsimusi üleminekuriikides

  6. 78 FR 13376 - Draft Environmental Impact Statement for the Cottonwood Cove and Katherine Landing Development...

    Science.gov (United States)

    2013-02-27

    ... 1 Continue Current Management Trends (no action alternative) reflects current management direction... General Management Plan/Development Concept Plans/Final Environmental Impact Statement and to incorporate... Lake Management Plan/Final Environmental Impact Statement. Each development concept plan provides an...

  7. Symposium on job creation and job destruction in transition countries / John Haltiwanger, Hartmut Lehmann, Katherine Terrell

    Index Scriptorium Estoniae

    Haltiwanger, John

    2003-01-01

    Ülevaade 2002. aasta aprillis Costa Rical toimunud konverentsi Labour Markets in Emerging Economies raames toimunud sümpoosiumist ning sealsetest ettekannetest, milles käsitleti tööjõu voolavusega seotud küsimusi üleminekuriikides

  8. "Katherine With-a-K and Little Nato": A Case Study of Culturally Responsible Pedagogy.

    Science.gov (United States)

    Parscal, Jeannie N.

    This case study, one of four, is part of a larger study, "Ethnographic Case Studies of Culturally Responsive Pedagogy (CRP) of At-Risk Students in Middle School Classrooms." The study provides relevant case literature regarding CRP for the enhancement of preservice teacher education and describes the characteristics of a multicultural…

  9. Square-wave anodic-stripping voltammetric determination of Cd, Pb, and Cu in a hydrofluoric acid solution of siliceous spicules of marine sponges (from the Ligurian Sea, Italy, and the Ross Sea, Antarctica)

    Energy Technology Data Exchange (ETDEWEB)

    Truzzi, C.; Annibaldi, A.; Illuminati, S.; Bassotti, E.; Scarponi, G. [Polytechnic University of Marche, Ancona (Italy). Department of Marine Science

    2008-09-15

    Square-wave anodic-stripping voltammetry (SWASV) was set up and optimized for simultaneous determination of cadmium, lead, and copper in siliceous spicules of marine sponges, directly in the hydrofluoric acid solution ({proportional_to}0.55 mol L{sup -1} HF, pH {proportional_to}1.9). A thin mercury-film electrode (TMFE) plated on to an HF-resistant epoxy-impregnated graphite rotating-disc support was used. The optimum experimental conditions, evaluated also in terms of the signal-to-noise ratio, were as follows: deposition potential -1100 mV vs. Ag/AgCl, KCl 3 mol L{sup -1}, deposition time 3-10 min, electrode rotation 3000 rpm, SW scan from -1100 mV to +100 mV, SW pulse amplitude 25 mV, frequency 100 Hz, {delta}E{sub step} 8 mV, t{sub step} 100 ms, t{sub wait} 60 ms, t{sub delay} 2 ms, t{sub meas} 3 ms. Under these conditions the metal peak potentials were Cd -654{+-}1 mV, Pb -458 {+-} 1 mV, Cu -198{+-}1 mV. The electrochemical behaviour was reversible for Pb, quasi-reversible for Cd, and kinetically controlled (possibly following chemical reaction) for Cu. The linearity of the response with concentration was verified up to {proportional_to}4 {mu}g L{sup -1} for Cd and Pb and {proportional_to}20 {mu}g L{sup -1} for Cu. The detection limits were 5.8 ng L{sup -1}, 3.6 ng L{sup -1}, and 4.3 ng L{sup -1} for Cd, Pb, and Cu, respectively, with t{sub d}=5 min. The method was applied for determination of the metals in spicules of two specimens of marine sponges (Demosponges) from the Portofino natural reserve (Ligurian Sea, Italy, Petrosia ficiformis) and Terra Nova Bay (Ross Sea, Antarctica, Sphaerotylus antarcticus). The metal contents varied from tens of ng g{sup -1} to {proportional_to}1 {mu}g g{sup -1}, depending on the metal considered and with significant differences between the two sponge species. (orig.)

  10. Doktoriväitekiri ooperilibretodest / Jaan Ross

    Index Scriptorium Estoniae

    Ross, Jaan, 1957-

    2013-01-01

    Arvustus: Кюналь, Антон. Специфика оперного либретто как текста : на примере опер на библейские сюжеты (Россия, вторая половина XIX в.). Таллинн : Таллиннский университет, 2012. (Tallinna Ülikooli humanitaarteaduste dissertatsioonid ; 14)

  11. Kohanemine tavalise eluga / Märten Ross

    Index Scriptorium Estoniae

    Ross, Märten, 1971-

    2007-01-01

    Majanduskasvu aeglustumisest tingitud muutustest kinnisvara- ja tööturul ning laenuvõtmisel. Autor soovitab kodu- ja tarbimislaenude puhul silmas pidada intresside võimalikku tõusu ka praegustelt tasemetelt, ettevõtjatele soovib julgust jätkata investeeringuid oma äride tõhustamiseks

  12. Doktoriväitekiri ooperilibretodest / Jaan Ross

    Index Scriptorium Estoniae

    Ross, Jaan, 1957-

    2013-01-01

    Arvustus: Кюналь, Антон. Специфика оперного либретто как текста : на примере опер на библейские сюжеты (Россия, вторая половина XIX в.). Таллинн : Таллиннский университет, 2012. (Tallinna Ülikooli humanitaarteaduste dissertatsioonid ; 14)

  13. Ross Perot and the Multinomial Distribution.

    Science.gov (United States)

    Aczel, Amir D.; And Others

    1994-01-01

    Present a graphical multivariate approach to the analysis and reporting of presidential poll results when more than two candidates command a significant percentage of the vote. Advocates a methodology based on joint statistical inference. Applies this methodology to polls prior to the 1992 presidential election. (HB)

  14. Kolm Baudelaire'i / Kristiina Ross

    Index Scriptorium Estoniae

    Ross, Kristiina

    2001-01-01

    Ette kantud raadios Vaba Euroopa. Rets. rmt.: Baudelaire, Charles. Kurja õied / tlk. Tõnu Õnnepalu. Tallinn : Eesti Keele Sihtasutus, 2000 ; Baudelaire, Charles. Väikesed kurja lilled / koost. Indrek Hirv ; tlk. I. Hirv, Ants Oras ja August Sang

  15. A Ross-Stirling spacecraft refrigerator

    Science.gov (United States)

    Walker, G.; Scott, M.; Zylstra, S.

    A spacecraft refrigerator was investigated capable of providing cooling for storage of food and biological samples in the temperature range 0-20 F with cooling capacity in the range of 1 to 2 kW, operating for long periods with great reliability. The system operated on the Stirling refrigeration cycle using the spacecraft life-support gases as the working fluid. A prototype spacecraft Stirling refrigerator was designed, built, and tested with air as the working fluid. The system performance was satisfactory, meeting the requirements specified above. Potential applications for the prototype unit are mentioned.

  16. Kohanemine tavalise eluga / Märten Ross

    Index Scriptorium Estoniae

    Ross, Märten, 1971-

    2007-01-01

    Majanduskasvu aeglustumisest tingitud muutustest kinnisvara- ja tööturul ning laenuvõtmisel. Autor soovitab kodu- ja tarbimislaenude puhul silmas pidada intresside võimalikku tõusu ka praegustelt tasemetelt, ettevõtjatele soovib julgust jätkata investeeringuid oma äride tõhustamiseks

  17. Teine Res Musica ilmunud / Jaan Ross

    Index Scriptorium Estoniae

    Ross, Jaan, 1957-

    2010-01-01

    Artiklikogumikust: Res musica [2] : Eesti Muusikateaduse Seltsi ja Eesti Muusika- ja Teatriakadeemia muusikateaduse osakonna aastaraamat / peatoimetaja Urve Lippus. Tallinn : Eesti Muusika- ja Teatriakadeemia, 2010

  18. APPROXIMATE HYDROLOGY, ROSS COUNTY,OH USA

    Data.gov (United States)

    Federal Emergency Management Agency, Department of Homeland Security — Hydrology data include spatial datasets and data tables necessary for documenting the hydrologic procedures for estimating flood discharges for a flood insurance...

  19. Teine Res Musica ilmunud / Jaan Ross

    Index Scriptorium Estoniae

    Ross, Jaan, 1957-

    2010-01-01

    Artiklikogumikust: Res musica [2] : Eesti Muusikateaduse Seltsi ja Eesti Muusika- ja Teatriakadeemia muusikateaduse osakonna aastaraamat / peatoimetaja Urve Lippus. Tallinn : Eesti Muusika- ja Teatriakadeemia, 2010

  20. 贵州省巴马森林病毒和罗斯河病毒感染的调查研究%Investigation of infection with Barmah Forest virus and Ross River virus in Guizhou province, China

    Institute of Scientific and Technical Information of China (English)

    叶绪芳; 付士红; 高晓艳; 赵苏晔; 刘淳婷; 王环宇; 吴升伟; 梁国栋

    2012-01-01

    Objective To investigate the infection with Barmah Forest virus (BFV) and Ross River virus (RRV) among arboviruses in Guizhou province, China, and to provide scientific basis for prevention and control of viral encephalitis of unknown origin. Methods BFV and RRV IgM antibodies were detected in patients with unexplained fever and viral encephalitis from 2005 to 2008 in Guizhou Province, and BFV and RRV IgG antibodies were detected in healthy persons in 2007. Results Out of the 204 cases with unexplained fever examined, 4 (1.96%) had BFV IgM antibody, and 6 (2.94%) had RRV IgM antibody. Out of the 426 cases with unexplained viral encephalitis examined, 12 (2.82%) had BFV IgM antibody, and 15 (3.52%) had RRV IgM antibody. Out of the 870 healthy persons examined, 1.49% had BFV IgG antibody, and 1.15% had RRV IgG antibody. The number of BFV/RRV IgM-positive cases and the number of counties with positive cases increased year by year from 2005 to 2008. Conclusion There might exist some diseases caused by BFV and RRV infection in Guizhou province, China, and we should strengthen monitoring and research work for the diseases caused by the two viruses.%目的 了解贵州省虫媒病毒中巴马森林病毒(BFV)、罗斯河病毒(RRV)的感染现状,为不明原因病毒性脑炎防治工作提供科学依据.方法 2005-2008年在贵州省采集不明原因发热和病毒性脑炎病例检测BFV、RRV IgM抗体,并对2007年健康人群进行BFV、RRV IgG抗体检测.结果 ①共检测204例不明原因发热病例BFV和RRV IgM抗体,BFVIgM抗体阳性4例,阳性率1.96%,RRV阳性6例,阳性率2.94%;②共检测426例病毒性脑炎病例BFV和RRV IgM抗体,BFV IgM抗体阳性12例,阳性率2.82%,RRV阳性15例,阳性率3.52%;③共检测870份健康人群BFV、RRVIgG抗体,BFV IgG抗体阳性率1.49%,RRV IgG抗体阳性率1.15%;④地区分布显示,2005-2008年BFV、RRV IgM抗体阳性病例数和分布县数呈逐年增加趋势.结论 贵州省可能

  1. Syn- and post-orogenic alkaline magmatism in a continental arc: Along-strike variations in the composition, source, and timing of igneous activity in the Ross Orogen, Antarctica

    Science.gov (United States)

    Hagen-Peter, G.; Cottle, J. M.

    2013-12-01

    Neoproterozoic-Paleozoic convergence and subduction along the margin of East Gondwana (Australia, New Zealand, Antarctica) resulted in a belt of deformed and metamorphosed sedimentary rocks and batholith-scale igneous intrusions comparable in size to the present day Andes. Mid-crustal levels of this belt, known as the Ross Orogen in Antarctica, are exposed in the basement of the Cenozoic Transantarctic Mountains, providing snapshots of the intrusive magma system of a major continental arc. Whole rock major- and trace-element geochemistry, Hf isotopes in zircon, and U-Pb geochronology have identified along-strike variations in the composition, source, and timing of magmatism along ~200 km of the southern Victoria Land segment of the orogen. There is an apparent younging of the igneous activity from south to north. New U-Pb ages for intrusive rocks from the Koettlitz Glacier Alkaline Province (KGAP) reveal that igneous activity spanned ca. 565-500 Ma (~30 m.y. longer than previously recognized), while immediately to the north in the Dry Valleys area most igneous activity was confined to a relatively short period (ca. 515-495 Ma). Alkaline and subalkaline igneous rocks occur in both the Dry Valleys area and the KGAP, but alkaline rocks in the Dry Valleys are restricted to the latest phase of magmatism. Na-alkaline rocks in the KGAP, including nepheline syenites, carbonatites, and A-type granites, range in age from ca. 545-500 Ma and overlap in age with more typical subduction/collision-related I- and S-type granites elsewhere in southern Victoria Land. Strong enrichments in the LILE and LREE and high LILE/HFSE and LREE/HREE of samples from the KGAP reveal a source enriched in aqueous-mobile elements, potentially a strongly metasomatized mantle wedge beneath the arc. In the Dry Valleys area, rocks with alkali-calcic composition constitute only the youngest intrusions (505-495 Ma), apparently reflecting a shift to post-orogenic magmatism. Zircons from Dry Valleys

  2. The writer's diary as borderland: the public and private selves of Virginia Woolf, Katherine Mansfield, and Louisa May Alcott

    OpenAIRE

    Jensen, Meg

    2012-01-01

    The Practice Ground for Fiction Dr Meg Jensen, Kingston University “It strikes me that in this book I practise writing; do my scales; yes and work at certain effects. I daresay I practised Jacob here; and Mrs D and shall invent my next book here; for here I write merely in the spirit – great fun it is too, and Old V of 1940 will see something in it too. “ From Virginia Woolf, The Writer’s Diary, October 17 1924. What is the work of a writers’ diary? A literary enterprise? Sketchbook?...

  3. A Psychological Analysis of Laura’s Personality in Katherine Mans-field’s The Garden Party

    Institute of Scientific and Technical Information of China (English)

    ZHOU Li-yun

    2015-01-01

    This paper explores Laura’s inner world, applying Freud’s theory of the unconscious and the structure of the mind, Jung’s idea of archetypes, and Lacan’s concepts of the three orders. The story in The Garden Party depicts, in the movement to⁃ward adulthood, how Laura feels, thinks and acts under the drive of the id, and the adjustment of the ego and the superego. Lau⁃ra’s psychological development indicates Laura has a healthy personality. She can confront her imperfection in her growth.

  4. El clavo de la memoria. Tiempo y narración en “The Canary” de Katherine Mansfield

    OpenAIRE

    Hernández Escobar, María Cristina; Facultad de Filosofía y Letras Universidad Nacional Autónoma de México

    2012-01-01

    Sabemos que el tiempo existe porque sentimos su paso, lo vivimos interiormente, pero para comunicarlo hace falta acudir a formas de discurso que trasciendan las fórmulas de la física, las taxonomías de los diccionarios y los tratados de filosofía que, pese a sus esfuerzos, representan conocimiento fragmentario, naturaleza muerta. La comprensión del tiempo, la posibilidad de observar en vivo cómo los seres humanos experimentamos, pensamos, significamos el tiempo, puede darse si podemos mirar e...

  5. On Technique of Expressing the Consciousness and the Detail Description in Katherine Mansfield’s A Dill Pickle

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    <正>This paper analyzes A Dill Pickle writing style especially from the perspective of the technique of expressing the consciousness and the detail description to discuss Mansfield’s artistic characteristics. It focused on the theme of the sense of loneliness and disillusion of women,and distinctive Modernist tendency.

  6. Dependencies, Demons, and Graphical Interfaces in the Ross Language

    Science.gov (United States)

    1988-03-01

    for partner in (ask Imyself recall your partners) do (let ((message (ask communication create new instance I(intern ( gensym ’m)) with sender...communication create new instance !(intern ( gensym ’m)) with sender Imyself receiver !partner content speed-up))) (tell Imessage get delivered

  7. Silent Circulation of Ross River Virus in French Polynesia

    Directory of Open Access Journals (Sweden)

    Maite Aubry

    2015-08-01

    Discussion: Our results support the existence of autochthonous RRV transmission and suggest that this pathogen has silently circulated in French Polynesia. These findings raise the question of possible undetected circulation of RRV in other Pacific Island Countries and Territories.

  8. Glengarry Glen Ross : Using BDI for sales game dialogues

    NARCIS (Netherlands)

    Muller, T.J.; Heuvelink, A.; Bosch, K. van den; Swartjes, I.

    2012-01-01

    Serious games offer an opportunity for players to learn communication skills by practicing conversations with non-playing characters (NPCs). To realize this potential, the player needs freedom of play to discover the relationships between its actions and their effects on the partner and the

  9. Vadja sõnaraamat kui kunstiteos / Kristiina Ross

    Index Scriptorium Estoniae

    Ross, Kristiina, 1955-

    2011-01-01

    Arvustus: Vadja keele sõnaraamat. 1 / toimetanud Elna Adler, Merle Leppik. Tallinn : AE Signalet, 1990 ; Vadja keele sõnaraamat. 2, [K -küüttöseltšä] = Словарь водского языка. 2 / toimetanud Elna Adler, Merle Leppik. [Tallinn] ; [Tallinn] : Teaduste Akadeemia Kirjastus, 1994 ; Vadja keele sõnaraamat. 3, L - müüäG] = Словарь водского языка / toimetanud Elna Adler, Merle Leppik. [Tallinn] ; [Tallinn] : Eesti Keele Instituut, 1996 ; Vadja keele sõnaraamat. 4, [N - P] = Словарь водского языка. 4, [N - P] / toimetanud: Elna Adler, Merle Leppik. [Tallinn] : Eesti Keele Sihtasutus, 2000 ; Vadja keele sõnaraamat. 5, [R-S] = Словарь водского языка. 5, [R-S] / toimetanud Silja Grünberg. Tallinn : Eesti Keele Sihtasutus, 2006 ; Vadja keele sõnaraamat. 6, [Š-T] = Словарь водского языка. 6, [Š-T] / toimetanud Silja Grünberg. Tallinn : Eesti Keele Sihtasutus, 2010 ; Vadja keele sõnaraamat. 7 = Словарь водского языка / toimetanud Silja Grünberg. Tallinn : Eesti Keele Sihtasutus, 2011

  10. Uut laadi otsuste ootel / Märten Ross

    Index Scriptorium Estoniae

    Ross, Märten, 1971-

    2008-01-01

    Majanduskasvu aeglustumisest tingitud muutuste arvestamisest, maksukoormuse vähendamise ja riigi kulude suurendamise ebakõlast, majanduse ergutamisest riigieelarve defitsiidi kaudu ning riigireservide kasutamise probleemist

  11. Kasvu aeglustumine on loomulik / Märten Ross

    Index Scriptorium Estoniae

    Ross, Märten, 1971-

    2008-01-01

    Eesti Panga asepresident hindab Eesti majanduse väljavaateid majanduskasvu aeglustumise tingimustes ja leiab, et õigeid otsuseid tehes elab majandus kohanemise rasked ajad üle ka välismaailma kiuste

  12. Ne stoit sravnivat nas s Islandiei / Märten Ross

    Index Scriptorium Estoniae

    Ross, Märten, 1971-

    2008-01-01

    Eesti Panga asepresident kirjutab, et kuigi finantskriisi mõju tundub esialgu hirmutav, tähendab kriisi üleilmne iseloom Eestile ka positiivseid tagajärgi - inflatsioon ja jooksevkonto defitsiit järk-järgult vähenevad, pidurdub küttehinna tõus, Eesti panganduse kuulumine Euroopa ühtsesse pangasüsteemi tagab aga võimalikele probleemidele kindlamad lahendused

  13. Väljakutsed laiast maailmast / Märten Ross

    Index Scriptorium Estoniae

    Ross, Märten, 1971-

    2008-01-01

    Eesti majanduskasvu aeglustumise peapõhjus tuleneb sellest, et EL-iga liitumisele järgnenud kasvusüst hakkab ennast ammendama. Pole mõtet üritada hoida seni kasvu vedanud sektoreid üleval riigi kulusid vägisi suurendades; riik peab toetama sellist majanduskeskkonda, mis innustaks ja sunniks majandust uusi töökohti looma, ütleb Eesti Panga asepresident

  14. New Houghton Hospital, Hospital Road, New Ross, Wexford.

    LENUS (Irish Health Repository)

    Abdel Aziz, Mohamed T

    2011-05-05

    Abstract Background The present study was conducted to evaluate the tumor suppressive effects of bone marrow derived mesenchymal stem cells (MSCs) in an experimental hepatocellular carcinoma (HCC) model in rats and to investigate the possible role of Wnt signaling in hepato-carcinogenesis. Methods Ninety rats were included in the study and were divided equally into: Control group, rats which received MSCs only, rats which received MSCs vehicle only, HCC group induced by diethylnitroseamine (DENA) and CCl 4 , rats which received MSCs after HCC induction, rats which received MSCs before HCC induction. Histopathological examination and gene expression of Wnt signaling target genes by real time, reverse transcription-polymerase chain reaction (RT-PCR) in rat liver tissue, in addition to serum levels of ALT, AST and alpha fetoprotein were performed in all groups. Results Histopathological examination of liver tissue from animals which received DENA-CCl4 only, revealed the presence of anaplastic carcinoma cells and macro-regenerative nodules type II with foci of large and small cell dysplasia. Administration of MSCs into rats after induction of experimental HCC improved the histopathological picture which showed minimal liver cell damage, reversible changes, areas of cell drop out filled with stem cells. Gene expression in rat liver tissue demonstrated that MSCs downregulated β-catenin, proliferating cell nuclear antigen (PCNA), cyclin D and survivin genes expression in liver tissues after HCC induction. Amelioration of the liver status after administration of MSCs has been inferred by the significant decrease of ALT, AST and Alpha fetoprotein serum levels. Administration of MSCs before HCC induction did not show any tumor suppressive or protective effect. Conclusions Administration of MSCs in chemically induced HCC has tumor suppressive effects as evidenced by down regulation of Wnt signaling target genes concerned with antiapoptosis, mitogenesis, cell proliferation and cell cycle regulation, with subsequent amelioration of liver histopathological picture and liver function.

  15. Cherry Grove Nursing Home, Priesthaggard, Campile, New Ross, Wexford.

    LENUS (Irish Health Repository)

    Breen, C

    2014-02-01

    The aim of dietary modification, as a cornerstone of type 2 diabetes (T2DM) management, is to optimise metabolic control and overall health. This study describes food and nutrient intake in a sample of adults with T2DM, and compares this to recommendations, and to intake in age, sex, body mass index (BMI) and social-class matched adults without T2DM.

  16. Glengarry Glen Ross : Using BDI for sales game dialogues

    NARCIS (Netherlands)

    Muller, T.J.; Heuvelink, A.; Bosch, K. van den; Swartjes, I.

    2012-01-01

    Serious games offer an opportunity for players to learn communication skills by practicing conversations with non-playing characters (NPCs). To realize this potential, the player needs freedom of play to discover the relationships between its actions and their effects on the partner and the conversa

  17. Duell diktaatoriga / Juri Hashtshevatski ; interv. Kelly Grossthal, Maari Ross

    Index Scriptorium Estoniae

    Hashtshevatski, Juri

    2007-01-01

    Tallinnas linastub esimene Eesti-Valgevene ühistöö "Kalinovski väljak", dokumentaalfilm Valgevene kuulsaima režissööri pikalt kestnud ja ohtlikust konfliktist diktaator Lukashenkaga. Poliitilisest olukorrast Valgevenes, president Aleksandr Lukashenkast

  18. Millhouse Care Centre, Newtown Commons, New Ross, Wexford.

    OpenAIRE

    2015-01-01

    This inspection report sets out the findings of a monitoring inspection, the purpose of which was to monitor ongoing regulatory compliance. This monitoring inspection was un-announced and took place over 1 day(s). The inspection took place over the following dates and times From: To: 01 October 2015 09:30 01 October 2015 16:00

  19. Kasvu aeglustumine on loomulik / Märten Ross

    Index Scriptorium Estoniae

    Ross, Märten, 1971-

    2008-01-01

    Eesti Panga asepresident hindab Eesti majanduse väljavaateid majanduskasvu aeglustumise tingimustes ja leiab, et õigeid otsuseid tehes elab majandus kohanemise rasked ajad üle ka välismaailma kiuste

  20. Väljakutsed laiast maailmast / Märten Ross

    Index Scriptorium Estoniae

    Ross, Märten, 1971-

    2008-01-01

    Eesti majanduskasvu aeglustumise peapõhjus tuleneb sellest, et EL-iga liitumisele järgnenud kasvusüst hakkab ennast ammendama. Pole mõtet üritada hoida seni kasvu vedanud sektoreid üleval riigi kulusid vägisi suurendades; riik peab toetama sellist majanduskeskkonda, mis innustaks ja sunniks majandust uusi töökohti looma, ütleb Eesti Panga asepresident